/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2006-03-14 Bernard the first version * 2006-04-25 Bernard implement semaphore * 2006-05-03 Bernard add RT_IPC_DEBUG * modify the type of IPC waiting time to rt_int32_t * 2006-05-10 Bernard fix the semaphore take bug and add IPC object * 2006-05-12 Bernard implement mailbox and message queue * 2006-05-20 Bernard implement mutex * 2006-05-23 Bernard implement fast event * 2006-05-24 Bernard implement event * 2006-06-03 Bernard fix the thread timer init bug * 2006-06-05 Bernard fix the mutex release bug * 2006-06-07 Bernard fix the message queue send bug * 2006-08-04 Bernard add hook support * 2009-05-21 Yi.qiu fix the sem release bug * 2009-07-18 Bernard fix the event clear bug * 2009-09-09 Bernard remove fast event and fix ipc release bug * 2009-10-10 Bernard change semaphore and mutex value to unsigned value * 2009-10-25 Bernard change the mb/mq receive timeout to 0 if the * re-calculated delta tick is a negative number. * 2009-12-16 Bernard fix the rt_ipc_object_suspend issue when IPC flag * is RT_IPC_FLAG_PRIO * 2010-01-20 mbbill remove rt_ipc_object_decrease function. * 2010-04-20 Bernard move memcpy outside interrupt disable in mq * 2010-10-26 yi.qiu add module support in rt_mp_delete and rt_mq_delete * 2010-11-10 Bernard add IPC reset command implementation. * 2011-12-18 Bernard add more parameter checking in message queue * 2013-09-14 Grissiom add an option check in rt_event_recv * 2018-10-02 Bernard add 64bit support for mailbox * 2019-09-16 tyx add send wait support for message queue * 2020-07-29 Meco Man fix thread->event_set/event_info when received an * event without pending * 2020-10-11 Meco Man add value overflow-check code * 2021-01-03 Meco Man implement rt_mb_urgent() * 2021-05-30 Meco Man implement rt_mutex_trytake() */ #include #include #ifdef RT_USING_HOOK extern void (*rt_object_trytake_hook)(struct rt_object *object); extern void (*rt_object_take_hook)(struct rt_object *object); extern void (*rt_object_put_hook)(struct rt_object *object); #endif /* RT_USING_HOOK */ /** * @addtogroup IPC */ /**@{*/ /** * @brief This function will initialize an IPC object, such as semaphore, mutex, messagequeue and mailbox. * * @note Executing this function will complete an initialization of the suspend thread list of the ipc object. * * @param ipc is a pointer to the IPC object. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * When the return value is any other values, it means the initialization failed. * * @warning This function can be called from all IPC initialization and creation. */ rt_inline rt_err_t _ipc_object_init(struct rt_ipc_object *ipc) { /* initialize ipc object */ rt_list_init(&(ipc->suspend_thread)); return RT_EOK; } /** * @brief This function will suspend a thread to a IPC object list. * * @param list is a pointer to a suspended thread list of the IPC object. * * @param thread is a pointer to the thread object to be suspended. * * @param flag is a flag for the thread object to be suspended. It determines how the thread is suspended. * The flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to use * RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this semaphore will become non-real-time threads. * * @return Return the operation status. When the return value is RT_EOK, the function is successfully executed. * When the return value is any other values, it means the initialization failed. * * @warning This function can ONLY be called in the thread context, you can use RT_DEBUG_IN_THREAD_CONTEXT to * check the context. * In addition, this function is generally called by the following functions: * rt_sem_take(), rt_mutex_take(), rt_event_recv(), rt_mb_send_wait(), * rt_mb_recv(), rt_mq_recv(), rt_mq_send_wait() */ rt_inline rt_err_t _ipc_list_suspend(rt_list_t *list, struct rt_thread *thread, rt_uint8_t flag) { /* suspend thread */ rt_thread_suspend(thread); switch (flag) { case RT_IPC_FLAG_FIFO: rt_list_insert_before(list, &(thread->tlist)); break; /* RT_IPC_FLAG_FIFO */ case RT_IPC_FLAG_PRIO: { struct rt_list_node *n; struct rt_thread *sthread; /* find a suitable position */ for (n = list->next; n != list; n = n->next) { sthread = rt_list_entry(n, struct rt_thread, tlist); /* find out */ if (thread->current_priority < sthread->current_priority) { /* insert this thread before the sthread */ rt_list_insert_before(&(sthread->tlist), &(thread->tlist)); break; } } /* * not found a suitable position, * append to the end of suspend_thread list */ if (n == list) rt_list_insert_before(list, &(thread->tlist)); } break;/* RT_IPC_FLAG_PRIO */ default: RT_ASSERT(0); break; } return RT_EOK; } /** * @brief This function will resume a thread. * * @note This function will resume the first thread in the list of a IPC object. * 1. remove the thread from suspend queue of a IPC object. * 2. put the thread into system ready queue. * * By contrast, the rt_ipc_list_resume_all() function will resume all suspended threads * in the list of a IPC object. * * @param list is a pointer to a suspended thread list of the IPC object. * * @return Return the operation status. When the return value is RT_EOK, the function is successfully executed. * When the return value is any other values, it means this operation failed. * * @warning This function is generally called by the following functions: * rt_sem_release(), rt_mutex_release(), rt_mb_send_wait(), rt_mq_send_wait(), * rt_mb_urgent(), rt_mb_recv(), rt_mq_urgent(), rt_mq_recv(), */ rt_inline rt_err_t _ipc_list_resume(rt_list_t *list) { struct rt_thread *thread; /* get thread entry */ thread = rt_list_entry(list->next, struct rt_thread, tlist); RT_DEBUG_LOG(RT_DEBUG_IPC, ("resume thread:%s\n", thread->name)); /* resume it */ rt_thread_resume(thread); return RT_EOK; } /** * @brief This function will resume all suspended threads in the IPC object list, * including the suspended list of IPC object, and private list of mailbox etc. * * @note This function will resume all threads in the IPC object list. * By contrast, the rt_ipc_list_resume() function will resume a suspended thread in the list of a IPC object. * * @param list is a pointer to a suspended thread list of the IPC object. * * @return Return the operation status. When the return value is RT_EOK, the function is successfully executed. * When the return value is any other values, it means this operation failed. * */ rt_inline rt_err_t _ipc_list_resume_all(rt_list_t *list) { struct rt_thread *thread; register rt_ubase_t temp; /* wakeup all suspended threads */ while (!rt_list_isempty(list)) { /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* get next suspended thread */ thread = rt_list_entry(list->next, struct rt_thread, tlist); /* set error code to RT_ERROR */ thread->error = -RT_ERROR; /* * resume thread * In rt_thread_resume function, it will remove current thread from * suspended list */ rt_thread_resume(thread); /* enable interrupt */ rt_hw_interrupt_enable(temp); } return RT_EOK; } /**@}*/ #ifdef RT_USING_SEMAPHORE /** * @addtogroup semaphore */ /**@{*/ /** * @brief This function will initialize a static semaphore object. * * @note For the static semaphore object, its memory space is allocated by the compiler during compiling, * and shall placed on the read-write data segment or on the uninitialized data segment. * By contrast, the rt_sem_create() function will allocate memory space automatically and initialize * the semaphore. * * @see rt_sem_create() * * @param sem is a pointer to the semaphore to initialize. It is assumed that storage for the semaphore will be * allocated in your application. * * @param name is a pointer to the name you would like to give the semaphore. * * @param value is the initial value for the semaphore. * If used to share resources, you should initialize the value as the number of available resources. * If used to signal the occurrence of an event, you should initialize the value as 0. * * @param flag is the semaphore flag, which determines the queuing way of how multiple threads wait * when the semaphore is not available. * The semaphore flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this semaphore will become non-real-time threads. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it represents the initialization failed. * * @warning This function can ONLY be called from threads. */ rt_err_t rt_sem_init(rt_sem_t sem, const char *name, rt_uint32_t value, rt_uint8_t flag) { RT_ASSERT(sem != RT_NULL); RT_ASSERT(value < 0x10000U); RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); /* initialize object */ rt_object_init(&(sem->parent.parent), RT_Object_Class_Semaphore, name); /* initialize ipc object */ _ipc_object_init(&(sem->parent)); /* set initial value */ sem->value = (rt_uint16_t)value; /* set parent */ sem->parent.parent.flag = flag; return RT_EOK; } RTM_EXPORT(rt_sem_init); /** * @brief This function will detach a static semaphore object. * * @note This function is used to detach a static semaphore object which is initialized by rt_sem_init() function. * By contrast, the rt_sem_delete() function will delete a semaphore object. * When the semaphore is successfully detached, it will resume all suspended threads in the semaphore list. * * @see rt_sem_delete() * * @param sem is a pointer to a semaphore object to be detached. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it means that the semaphore detach failed. * * @warning This function can ONLY detach a static semaphore initialized by the rt_sem_init() function. * If the semaphore is created by the rt_sem_create() function, you MUST NOT USE this function to detach it, * ONLY USE the rt_sem_delete() function to complete the deletion. */ rt_err_t rt_sem_detach(rt_sem_t sem) { /* parameter check */ RT_ASSERT(sem != RT_NULL); RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore); RT_ASSERT(rt_object_is_systemobject(&sem->parent.parent)); /* wakeup all suspended threads */ _ipc_list_resume_all(&(sem->parent.suspend_thread)); /* detach semaphore object */ rt_object_detach(&(sem->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_sem_detach); #ifdef RT_USING_HEAP /** * @brief Creating a semaphore object. * * @note For the semaphore object, its memory space is allocated automatically. * By contrast, the rt_sem_init() function will initialize a static semaphore object. * * @see rt_sem_init() * * @param name is a pointer to the name you would like to give the semaphore. * * @param value is the initial value for the semaphore. * If used to share resources, you should initialize the value as the number of available resources. * If used to signal the occurrence of an event, you should initialize the value as 0. * * @param flag is the semaphore flag, which determines the queuing way of how multiple threads wait * when the semaphore is not available. * The semaphore flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this semaphore will become non-real-time threads. * * @return Return a pointer to the semaphore object. When the return value is RT_NULL, it means the creation failed. * * @warning This function can NOT be called in interrupt context. You can use macor RT_DEBUG_NOT_IN_INTERRUPT to check it. */ rt_sem_t rt_sem_create(const char *name, rt_uint32_t value, rt_uint8_t flag) { rt_sem_t sem; RT_ASSERT(value < 0x10000U); RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); RT_DEBUG_NOT_IN_INTERRUPT; /* allocate object */ sem = (rt_sem_t)rt_object_allocate(RT_Object_Class_Semaphore, name); if (sem == RT_NULL) return sem; /* initialize ipc object */ _ipc_object_init(&(sem->parent)); /* set initial value */ sem->value = value; /* set parent */ sem->parent.parent.flag = flag; return sem; } RTM_EXPORT(rt_sem_create); /** * @brief This function will delete a semaphore object and release the memory space. * * @note This function is used to delete a semaphore object which is created by the rt_sem_create() function. * By contrast, the rt_sem_detach() function will detach a static semaphore object. * When the semaphore is successfully deleted, it will resume all suspended threads in the semaphore list. * * @see rt_sem_detach() * * @param sem is a pointer to a semaphore object to be deleted. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the semaphore detach failed. * * @warning This function can ONLY delete a semaphore initialized by the rt_sem_create() function. * If the semaphore is initialized by the rt_sem_init() function, you MUST NOT USE this function to delete it, * ONLY USE the rt_sem_detach() function to complete the detachment. */ rt_err_t rt_sem_delete(rt_sem_t sem) { /* parameter check */ RT_ASSERT(sem != RT_NULL); RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore); RT_ASSERT(rt_object_is_systemobject(&sem->parent.parent) == RT_FALSE); RT_DEBUG_NOT_IN_INTERRUPT; /* wakeup all suspended threads */ _ipc_list_resume_all(&(sem->parent.suspend_thread)); /* delete semaphore object */ rt_object_delete(&(sem->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_sem_delete); #endif /* RT_USING_HEAP */ /** * @brief This function will take a semaphore, if the semaphore is unavailable, the thread shall wait for * the semaphore up to a specified time. * * @note When this function is called, the count value of the sem->value will decrease 1 until it is equal to 0. * When the sem->value is 0, it means that the semaphore is unavailable. At this time, it will suspend the * thread preparing to take the semaphore. * On the contrary, the rt_sem_release() function will increase the count value of sem->value by 1 each time. * * @see rt_sem_trytake() * * @param sem is a pointer to a semaphore object. * * @param time is a timeout period (unit: an OS tick). If the semaphore is unavailable, the thread will wait for * the semaphore up to the amount of time specified by the argument. * NOTE: Generally, we use the macro RT_WAITING_FOREVER to set this parameter, which means that when the * semaphore is unavailable, the thread will be waitting forever. * * @return Return the operation status. ONLY When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the semaphore take failed. * * @warning This function can ONLY be called in the thread context. It MUST NOT BE called in interrupt context. */ rt_err_t rt_sem_take(rt_sem_t sem, rt_int32_t time) { register rt_base_t temp; struct rt_thread *thread; /* parameter check */ RT_ASSERT(sem != RT_NULL); RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore); RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(sem->parent.parent))); /* disable interrupt */ temp = rt_hw_interrupt_disable(); RT_DEBUG_LOG(RT_DEBUG_IPC, ("thread %s take sem:%s, which value is: %d\n", rt_thread_self()->name, ((struct rt_object *)sem)->name, sem->value)); if (sem->value > 0) { /* semaphore is available */ sem->value --; /* enable interrupt */ rt_hw_interrupt_enable(temp); } else { /* no waiting, return with timeout */ if (time == 0) { rt_hw_interrupt_enable(temp); return -RT_ETIMEOUT; } else { /* current context checking */ RT_DEBUG_IN_THREAD_CONTEXT; /* semaphore is unavailable, push to suspend list */ /* get current thread */ thread = rt_thread_self(); /* reset thread error number */ thread->error = RT_EOK; RT_DEBUG_LOG(RT_DEBUG_IPC, ("sem take: suspend thread - %s\n", thread->name)); /* suspend thread */ _ipc_list_suspend(&(sem->parent.suspend_thread), thread, sem->parent.parent.flag); /* has waiting time, start thread timer */ if (time > 0) { RT_DEBUG_LOG(RT_DEBUG_IPC, ("set thread:%s to timer list\n", thread->name)); /* reset the timeout of thread timer and start it */ rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &time); rt_timer_start(&(thread->thread_timer)); } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* do schedule */ rt_schedule(); if (thread->error != RT_EOK) { return thread->error; } } } RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(sem->parent.parent))); return RT_EOK; } RTM_EXPORT(rt_sem_take); /** * @brief This function will try to take a semaphore, if the semaphore is unavailable, the thread returns immediately. * * @note This function is very similar to the rt_sem_take() function, when the semaphore is not available, * the rt_sem_trytake() function will return immediately without waiting for a timeout. * In other words, rt_sem_trytake(sem) has the same effect as rt_sem_take(sem, 0). * * @see rt_sem_take() * * @param sem is a pointer to a semaphore object. * * @return Return the operation status. ONLY When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the semaphore take failed. */ rt_err_t rt_sem_trytake(rt_sem_t sem) { return rt_sem_take(sem, RT_WAITING_NO); } RTM_EXPORT(rt_sem_trytake); /** * @brief This function will release a semaphore. If there is thread suspended on the semaphore, it will get resumed. * * @note If there are threads suspended on this semaphore, the first thread in the list of this semaphore object * will be resumed, and a thread scheduling (rt_schedule) will be executed. * If no threads are suspended on this semaphore, the count value sem->value of this semaphore will increase by 1. * * @param sem is a pointer to a semaphore object. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the semaphore release failed. */ rt_err_t rt_sem_release(rt_sem_t sem) { register rt_base_t temp; register rt_bool_t need_schedule; /* parameter check */ RT_ASSERT(sem != RT_NULL); RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore); RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(sem->parent.parent))); need_schedule = RT_FALSE; /* disable interrupt */ temp = rt_hw_interrupt_disable(); RT_DEBUG_LOG(RT_DEBUG_IPC, ("thread %s releases sem:%s, which value is: %d\n", rt_thread_self()->name, ((struct rt_object *)sem)->name, sem->value)); if (!rt_list_isempty(&sem->parent.suspend_thread)) { /* resume the suspended thread */ _ipc_list_resume(&(sem->parent.suspend_thread)); need_schedule = RT_TRUE; } else { if(sem->value < RT_SEM_VALUE_MAX) { sem->value ++; /* increase value */ } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* resume a thread, re-schedule */ if (need_schedule == RT_TRUE) rt_schedule(); return RT_EOK; } RTM_EXPORT(rt_sem_release); /** * @brief This function will set some extra attributions of a semaphore object. * * @note Currently this function only supports the RT_IPC_CMD_RESET command to reset the semaphore. * * @param sem is a pointer to a semaphore object. * * @param cmd is a command word used to configure some attributions of the semaphore. * * @param arg is the argument of the function to execute the command. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that this function failed to execute. */ rt_err_t rt_sem_control(rt_sem_t sem, int cmd, void *arg) { rt_ubase_t level; /* parameter check */ RT_ASSERT(sem != RT_NULL); RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore); if (cmd == RT_IPC_CMD_RESET) { rt_ubase_t value; /* get value */ value = (rt_ubase_t)arg; /* disable interrupt */ level = rt_hw_interrupt_disable(); /* resume all waiting thread */ _ipc_list_resume_all(&sem->parent.suspend_thread); /* set new value */ sem->value = (rt_uint16_t)value; /* enable interrupt */ rt_hw_interrupt_enable(level); rt_schedule(); return RT_EOK; } return -RT_ERROR; } RTM_EXPORT(rt_sem_control); /**@}*/ #endif /* RT_USING_SEMAPHORE */ #ifdef RT_USING_MUTEX /** * @addtogroup mutex */ /**@{*/ /** * @brief Initialize a static mutex object. * * @note For the static mutex object, its memory space is allocated by the compiler during compiling, * and shall placed on the read-write data segment or on the uninitialized data segment. * By contrast, the rt_mutex_create() function will automatically allocate memory space * and initialize the mutex. * * @see rt_mutex_create() * * @param mutex is a pointer to the mutex to initialize. It is assumed that storage for the mutex will be * allocated in your application. * * @param name is a pointer to the name that given to the mutex. * * @param flag is the mutex flag, which determines the queuing way of how multiple threads wait * when the mutex is not available. * NOTE: The mutex flag can ONLY be RT_IPC_FLAG_PRIO. Using RT_IPC_FLAG_FIFO will seriously affect * the real-time performance of the system. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it represents the initialization failed. * * @warning This function can ONLY be called from threads. */ rt_err_t rt_mutex_init(rt_mutex_t mutex, const char *name, rt_uint8_t flag) { (void)flag; /* parameter check */ RT_ASSERT(mutex != RT_NULL); /* initialize object */ rt_object_init(&(mutex->parent.parent), RT_Object_Class_Mutex, name); /* initialize ipc object */ _ipc_object_init(&(mutex->parent)); mutex->value = 1; mutex->owner = RT_NULL; mutex->original_priority = 0xFF; mutex->hold = 0; /* flag can only be RT_IPC_FLAG_PRIO. RT_IPC_FLAG_FIFO cannot solve the unbounded priority inversion problem */ mutex->parent.parent.flag = RT_IPC_FLAG_PRIO; return RT_EOK; } RTM_EXPORT(rt_mutex_init); /** * @brief This function will detach a static mutex object. * * @note This function is used to detach a static mutex object which is initialized by rt_mutex_init() function. * By contrast, the rt_mutex_delete() function will delete a mutex object. * When the mutex is successfully detached, it will resume all suspended threads in the mutex list. * * @see rt_mutex_delete() * * @param mutex is a pointer to a mutex object to be detached. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it means that the mutex detach failed. * * @warning This function can ONLY detach a static mutex initialized by the rt_mutex_init() function. * If the mutex is created by the rt_mutex_create() function, you MUST NOT USE this function to detach it, * ONLY USE the rt_mutex_delete() function to complete the deletion. */ rt_err_t rt_mutex_detach(rt_mutex_t mutex) { /* parameter check */ RT_ASSERT(mutex != RT_NULL); RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex); RT_ASSERT(rt_object_is_systemobject(&mutex->parent.parent)); /* wakeup all suspended threads */ _ipc_list_resume_all(&(mutex->parent.suspend_thread)); /* detach mutex object */ rt_object_detach(&(mutex->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_mutex_detach); #ifdef RT_USING_HEAP /** * @brief This function will create a mutex object. * * @note For the mutex object, its memory space is automatically allocated. * By contrast, the rt_mutex_init() function will initialize a static mutex object. * * @see rt_mutex_init() * * @param name is a pointer to the name that given to the mutex. * * @param flag is the mutex flag, which determines the queuing way of how multiple threads wait * when the mutex is not available. * NOTE: The mutex flag can ONLY be RT_IPC_FLAG_PRIO. Using RT_IPC_FLAG_FIFO will seriously affect * the real-time performance of the system. * * @return Return a pointer to the mutex object. When the return value is RT_NULL, it means the creation failed. * * @warning This function can ONLY be called from threads. */ rt_mutex_t rt_mutex_create(const char *name, rt_uint8_t flag) { struct rt_mutex *mutex; (void)flag; RT_DEBUG_NOT_IN_INTERRUPT; /* allocate object */ mutex = (rt_mutex_t)rt_object_allocate(RT_Object_Class_Mutex, name); if (mutex == RT_NULL) return mutex; /* initialize ipc object */ _ipc_object_init(&(mutex->parent)); mutex->value = 1; mutex->owner = RT_NULL; mutex->original_priority = 0xFF; mutex->hold = 0; /* flag can only be RT_IPC_FLAG_PRIO. RT_IPC_FLAG_FIFO cannot solve the unbounded priority inversion problem */ mutex->parent.parent.flag = RT_IPC_FLAG_PRIO; return mutex; } RTM_EXPORT(rt_mutex_create); /** * @brief This function will delete a mutex object and release this memory space. * * @note This function is used to delete a mutex object which is created by the rt_mutex_create() function. * By contrast, the rt_mutex_detach() function will detach a static mutex object. * When the mutex is successfully deleted, it will resume all suspended threads in the mutex list. * * @see rt_mutex_detach() * * @param mutex is a pointer to a mutex object to be deleted. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mutex detach failed. * * @warning This function can ONLY delete a mutex initialized by the rt_mutex_create() function. * If the mutex is initialized by the rt_mutex_init() function, you MUST NOT USE this function to delete it, * ONLY USE the rt_mutex_detach() function to complete the detachment. */ rt_err_t rt_mutex_delete(rt_mutex_t mutex) { /* parameter check */ RT_ASSERT(mutex != RT_NULL); RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex); RT_ASSERT(rt_object_is_systemobject(&mutex->parent.parent) == RT_FALSE); RT_DEBUG_NOT_IN_INTERRUPT; /* wakeup all suspended threads */ _ipc_list_resume_all(&(mutex->parent.suspend_thread)); /* delete mutex object */ rt_object_delete(&(mutex->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_mutex_delete); #endif /* RT_USING_HEAP */ /** * @brief This function will take a mutex, if the mutex is unavailable, the thread shall wait for * the mutex up to a specified time. * * @note When this function is called, the count value of the sem->value will decrease 1 until it is equal to 0. * When the sem->value is 0, it means that the mutex is unavailable. At this time, it will suspend the * thread preparing to take the mutex. * On the contrary, the rt_sem_release() function will increase the count value of sem->value by 1 each time. * * @see rt_mutex_trytake() * * @param mutex is a pointer to a mutex object. * * @param time is a timeout period (unit: an OS tick). If the mutex is unavailable, the thread will wait for * the mutex up to the amount of time specified by the argument. * NOTE: Generally, we set this parameter to RT_WAITING_FOREVER, which means that when the mutex is unavailable, * the thread will be waitting forever. * * @return Return the operation status. ONLY When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mutex take failed. * * @warning This function can ONLY be called in the thread context. It MUST NOT BE called in interrupt context. */ rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t time) { register rt_base_t temp; struct rt_thread *thread; /* this function must not be used in interrupt even if time = 0 */ RT_DEBUG_IN_THREAD_CONTEXT; /* parameter check */ RT_ASSERT(mutex != RT_NULL); RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex); /* get current thread */ thread = rt_thread_self(); /* disable interrupt */ temp = rt_hw_interrupt_disable(); RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(mutex->parent.parent))); RT_DEBUG_LOG(RT_DEBUG_IPC, ("mutex_take: current thread %s, mutex value: %d, hold: %d\n", thread->name, mutex->value, mutex->hold)); /* reset thread error */ thread->error = RT_EOK; if (mutex->owner == thread) { if(mutex->hold < RT_MUTEX_HOLD_MAX) { /* it's the same thread */ mutex->hold ++; } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } } else { #ifdef RT_USING_SIGNALS __again: #endif /* RT_USING_SIGNALS */ /* The value of mutex is 1 in initial status. Therefore, if the * value is great than 0, it indicates the mutex is avaible. */ if (mutex->value > 0) { /* mutex is available */ mutex->value --; /* set mutex owner and original priority */ mutex->owner = thread; mutex->original_priority = thread->current_priority; if(mutex->hold < RT_MUTEX_HOLD_MAX) { mutex->hold ++; } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } } else { /* no waiting, return with timeout */ if (time == 0) { /* set error as timeout */ thread->error = -RT_ETIMEOUT; /* enable interrupt */ rt_hw_interrupt_enable(temp); return -RT_ETIMEOUT; } else { /* mutex is unavailable, push to suspend list */ RT_DEBUG_LOG(RT_DEBUG_IPC, ("mutex_take: suspend thread: %s\n", thread->name)); /* change the owner thread priority of mutex */ if (thread->current_priority < mutex->owner->current_priority) { /* change the owner thread priority */ rt_thread_control(mutex->owner, RT_THREAD_CTRL_CHANGE_PRIORITY, &thread->current_priority); } /* suspend current thread */ _ipc_list_suspend(&(mutex->parent.suspend_thread), thread, mutex->parent.parent.flag); /* has waiting time, start thread timer */ if (time > 0) { RT_DEBUG_LOG(RT_DEBUG_IPC, ("mutex_take: start the timer of thread:%s\n", thread->name)); /* reset the timeout of thread timer and start it */ rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &time); rt_timer_start(&(thread->thread_timer)); } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* do schedule */ rt_schedule(); if (thread->error != RT_EOK) { #ifdef RT_USING_SIGNALS /* interrupt by signal, try it again */ if (thread->error == -RT_EINTR) goto __again; #endif /* RT_USING_SIGNALS */ /* return error */ return thread->error; } else { /* the mutex is taken successfully. */ /* disable interrupt */ temp = rt_hw_interrupt_disable(); } } } } /* enable interrupt */ rt_hw_interrupt_enable(temp); RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mutex->parent.parent))); return RT_EOK; } RTM_EXPORT(rt_mutex_take); /** * @brief This function will try to take a mutex, if the mutex is unavailable, the thread returns immediately. * * @note This function is very similar to the rt_mutex_take() function, when the mutex is not available, * except that rt_mutex_trytake() will return immediately without waiting for a timeout * when the mutex is not available. * In other words, rt_mutex_trytake(mutex) has the same effect as rt_mutex_take(mutex, 0). * * @see rt_mutex_take() * * @param mutex is a pointer to a mutex object. * * @return Return the operation status. ONLY When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mutex take failed. */ rt_err_t rt_mutex_trytake(rt_mutex_t mutex) { return rt_mutex_take(mutex, RT_WAITING_NO); } RTM_EXPORT(rt_mutex_trytake); /** * @brief This function will release a mutex. If there is thread suspended on the mutex, the thread will be resumed. * * @note If there are threads suspended on this mutex, the first thread in the list of this mutex object * will be resumed, and a thread scheduling (rt_schedule) will be executed. * If no threads are suspended on this mutex, the count value mutex->value of this mutex will increase by 1. * * @param mutex is a pointer to a mutex object. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mutex release failed. */ rt_err_t rt_mutex_release(rt_mutex_t mutex) { register rt_base_t temp; struct rt_thread *thread; rt_bool_t need_schedule; /* parameter check */ RT_ASSERT(mutex != RT_NULL); RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex); need_schedule = RT_FALSE; /* only thread could release mutex because we need test the ownership */ RT_DEBUG_IN_THREAD_CONTEXT; /* get current thread */ thread = rt_thread_self(); /* disable interrupt */ temp = rt_hw_interrupt_disable(); RT_DEBUG_LOG(RT_DEBUG_IPC, ("mutex_release:current thread %s, mutex value: %d, hold: %d\n", thread->name, mutex->value, mutex->hold)); RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mutex->parent.parent))); /* mutex only can be released by owner */ if (thread != mutex->owner) { thread->error = -RT_ERROR; /* enable interrupt */ rt_hw_interrupt_enable(temp); return -RT_ERROR; } /* decrease hold */ mutex->hold --; /* if no hold */ if (mutex->hold == 0) { /* change the owner thread to original priority */ if (mutex->original_priority != mutex->owner->current_priority) { rt_thread_control(mutex->owner, RT_THREAD_CTRL_CHANGE_PRIORITY, &(mutex->original_priority)); } /* wakeup suspended thread */ if (!rt_list_isempty(&mutex->parent.suspend_thread)) { /* get suspended thread */ thread = rt_list_entry(mutex->parent.suspend_thread.next, struct rt_thread, tlist); RT_DEBUG_LOG(RT_DEBUG_IPC, ("mutex_release: resume thread: %s\n", thread->name)); /* set new owner and priority */ mutex->owner = thread; mutex->original_priority = thread->current_priority; if(mutex->hold < RT_MUTEX_HOLD_MAX) { mutex->hold ++; } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } /* resume thread */ _ipc_list_resume(&(mutex->parent.suspend_thread)); need_schedule = RT_TRUE; } else { if(mutex->value < RT_MUTEX_VALUE_MAX) { /* increase value */ mutex->value ++; } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } /* clear owner */ mutex->owner = RT_NULL; mutex->original_priority = 0xff; } } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* perform a schedule */ if (need_schedule == RT_TRUE) rt_schedule(); return RT_EOK; } RTM_EXPORT(rt_mutex_release); /** * @brief This function will set some extra attributions of a mutex object. * * @note Currently this function does not implement the control function. * * @param mutex is a pointer to a mutex object. * * @param cmd is a command word used to configure some attributions of the mutex. * * @param arg is the argument of the function to execute the command. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that this function failed to execute. */ rt_err_t rt_mutex_control(rt_mutex_t mutex, int cmd, void *arg) { /* parameter check */ RT_ASSERT(mutex != RT_NULL); RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex); return -RT_ERROR; } RTM_EXPORT(rt_mutex_control); /**@}*/ #endif /* RT_USING_MUTEX */ #ifdef RT_USING_EVENT /** * @addtogroup event */ /**@{*/ /** * @brief The function will initialize a static event object. * * @note For the static event object, its memory space is allocated by the compiler during compiling, * and shall placed on the read-write data segment or on the uninitialized data segment. * By contrast, the rt_event_create() function will allocate memory space automatically * and initialize the event. * * @see rt_event_create() * * @param event is a pointer to the event to initialize. It is assumed that storage for the event * will be allocated in your application. * * @param name is a pointer to the name that given to the event. * * @param flag is the event flag, which determines the queuing way of how multiple threads wait * when the event is not available. * The event flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this event will become non-real-time threads. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it represents the initialization failed. * * @warning This function can ONLY be called from threads. */ rt_err_t rt_event_init(rt_event_t event, const char *name, rt_uint8_t flag) { /* parameter check */ RT_ASSERT(event != RT_NULL); RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); /* initialize object */ rt_object_init(&(event->parent.parent), RT_Object_Class_Event, name); /* set parent flag */ event->parent.parent.flag = flag; /* initialize ipc object */ _ipc_object_init(&(event->parent)); /* initialize event */ event->set = 0; return RT_EOK; } RTM_EXPORT(rt_event_init); /** * @brief This function will detach a static event object. * * @note This function is used to detach a static event object which is initialized by rt_event_init() function. * By contrast, the rt_event_delete() function will delete an event object. * When the event is successfully detached, it will resume all suspended threads in the event list. * * @see rt_event_delete() * * @param event is a pointer to an event object to be detached. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it means that the event detach failed. * * @warning This function can ONLY detach a static event initialized by the rt_event_init() function. * If the event is created by the rt_event_create() function, you MUST NOT USE this function to detach it, * ONLY USE the rt_event_delete() function to complete the deletion. */ rt_err_t rt_event_detach(rt_event_t event) { /* parameter check */ RT_ASSERT(event != RT_NULL); RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event); RT_ASSERT(rt_object_is_systemobject(&event->parent.parent)); /* resume all suspended thread */ _ipc_list_resume_all(&(event->parent.suspend_thread)); /* detach event object */ rt_object_detach(&(event->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_event_detach); #ifdef RT_USING_HEAP /** * @brief Creating an event object. * * @note For the event object, its memory space is allocated automatically. * By contrast, the rt_event_init() function will initialize a static event object. * * @see rt_event_init() * * @param name is a pointer to the name that given to the event. * * @param flag is the event flag, which determines the queuing way of how multiple threads wait when the event * is not available. * The event flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this event will become non-real-time threads. * * @return Return a pointer to the event object. When the return value is RT_NULL, it means the creation failed. * * @warning This function can ONLY be called from threads. */ rt_event_t rt_event_create(const char *name, rt_uint8_t flag) { rt_event_t event; RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); RT_DEBUG_NOT_IN_INTERRUPT; /* allocate object */ event = (rt_event_t)rt_object_allocate(RT_Object_Class_Event, name); if (event == RT_NULL) return event; /* set parent */ event->parent.parent.flag = flag; /* initialize ipc object */ _ipc_object_init(&(event->parent)); /* initialize event */ event->set = 0; return event; } RTM_EXPORT(rt_event_create); /** * @brief This function will delete an event object and release the memory space. * * @note This function is used to delete an event object which is created by the rt_event_create() function. * By contrast, the rt_event_detach() function will detach a static event object. * When the event is successfully deleted, it will resume all suspended threads in the event list. * * @see rt_event_detach() * * @param event is a pointer to an event object to be deleted. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the event detach failed. * * @warning This function can ONLY delete an event initialized by the rt_event_create() function. * If the event is initialized by the rt_event_init() function, you MUST NOT USE this function to delete it, * ONLY USE the rt_event_detach() function to complete the detachment. */ rt_err_t rt_event_delete(rt_event_t event) { /* parameter check */ RT_ASSERT(event != RT_NULL); RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event); RT_ASSERT(rt_object_is_systemobject(&event->parent.parent) == RT_FALSE); RT_DEBUG_NOT_IN_INTERRUPT; /* resume all suspended thread */ _ipc_list_resume_all(&(event->parent.suspend_thread)); /* delete event object */ rt_object_delete(&(event->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_event_delete); #endif /* RT_USING_HEAP */ /** * @brief This function will send an event to the event object. * If there is a thread suspended on the event, the thread will be resumed. * * @note When using this function, you need to use the parameter (set) to specify the event flag of the event object, * then the function will traverse the list of suspended threads waiting on the event object. * If there is a thread suspended on the event, and the thread's event_info and the event flag of * the current event object matches, the thread will be resumed. * * @param event is a pointer to the event object to be sent. * * @param set is a flag that you will set for this event's flag. * You can set an event flag, or you can set multiple flags through OR logic operation. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the event detach failed. */ rt_err_t rt_event_send(rt_event_t event, rt_uint32_t set) { struct rt_list_node *n; struct rt_thread *thread; register rt_ubase_t level; register rt_base_t status; rt_bool_t need_schedule; /* parameter check */ RT_ASSERT(event != RT_NULL); RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event); if (set == 0) return -RT_ERROR; need_schedule = RT_FALSE; /* disable interrupt */ level = rt_hw_interrupt_disable(); /* set event */ event->set |= set; RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(event->parent.parent))); if (!rt_list_isempty(&event->parent.suspend_thread)) { /* search thread list to resume thread */ n = event->parent.suspend_thread.next; while (n != &(event->parent.suspend_thread)) { /* get thread */ thread = rt_list_entry(n, struct rt_thread, tlist); status = -RT_ERROR; if (thread->event_info & RT_EVENT_FLAG_AND) { if ((thread->event_set & event->set) == thread->event_set) { /* received an AND event */ status = RT_EOK; } } else if (thread->event_info & RT_EVENT_FLAG_OR) { if (thread->event_set & event->set) { /* save the received event set */ thread->event_set = thread->event_set & event->set; /* received an OR event */ status = RT_EOK; } } else { /* enable interrupt */ rt_hw_interrupt_enable(level); return -RT_EINVAL; } /* move node to the next */ n = n->next; /* condition is satisfied, resume thread */ if (status == RT_EOK) { /* clear event */ if (thread->event_info & RT_EVENT_FLAG_CLEAR) event->set &= ~thread->event_set; /* resume thread, and thread list breaks out */ rt_thread_resume(thread); /* need do a scheduling */ need_schedule = RT_TRUE; } } } /* enable interrupt */ rt_hw_interrupt_enable(level); /* do a schedule */ if (need_schedule == RT_TRUE) rt_schedule(); return RT_EOK; } RTM_EXPORT(rt_event_send); /** * @brief This function will receive an event from event object. if the event is unavailable, the thread shall wait for * the event up to a specified time. * * @note If there are threads suspended on this semaphore, the first thread in the list of this semaphore object * will be resumed, and a thread scheduling (rt_schedule) will be executed. * If no threads are suspended on this semaphore, the count value sem->value of this semaphore will increase by 1. * * @param event is a pointer to the event object to be received. * * @param set is a flag that you will set for this event's flag. * You can set an event flag, or you can set multiple flags through OR logic operation. * * @param option is the option of this receiving event, it indicates how the receiving event is operated. * The option can be one or more of the following values, When selecting multiple values,use logical OR to operate. * (NOTE: RT_EVENT_FLAG_OR and RT_EVENT_FLAG_AND can only select one): * * * RT_EVENT_FLAG_OR The thread select to use logical OR to receive the event. * * RT_EVENT_FLAG_AND The thread select to use logical OR to receive the event. * * RT_EVENT_FLAG_CLEAR When the thread receives the corresponding event, the function * determines whether to clear the event flag. * * @param timeout is a timeout period (unit: an OS tick). * * @param recved is a pointer to the received event. If you don't care about this value, you can use RT_NULL to set. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the semaphore release failed. */ rt_err_t rt_event_recv(rt_event_t event, rt_uint32_t set, rt_uint8_t option, rt_int32_t timeout, rt_uint32_t *recved) { struct rt_thread *thread; register rt_ubase_t level; register rt_base_t status; RT_DEBUG_IN_THREAD_CONTEXT; /* parameter check */ RT_ASSERT(event != RT_NULL); RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event); if (set == 0) return -RT_ERROR; /* initialize status */ status = -RT_ERROR; /* get current thread */ thread = rt_thread_self(); /* reset thread error */ thread->error = RT_EOK; RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(event->parent.parent))); /* disable interrupt */ level = rt_hw_interrupt_disable(); /* check event set */ if (option & RT_EVENT_FLAG_AND) { if ((event->set & set) == set) status = RT_EOK; } else if (option & RT_EVENT_FLAG_OR) { if (event->set & set) status = RT_EOK; } else { /* either RT_EVENT_FLAG_AND or RT_EVENT_FLAG_OR should be set */ RT_ASSERT(0); } if (status == RT_EOK) { /* set received event */ if (recved) *recved = (event->set & set); /* fill thread event info */ thread->event_set = (event->set & set); thread->event_info = option; /* received event */ if (option & RT_EVENT_FLAG_CLEAR) event->set &= ~set; } else if (timeout == 0) { /* no waiting */ thread->error = -RT_ETIMEOUT; /* enable interrupt */ rt_hw_interrupt_enable(level); return -RT_ETIMEOUT; } else { /* fill thread event info */ thread->event_set = set; thread->event_info = option; /* put thread to suspended thread list */ _ipc_list_suspend(&(event->parent.suspend_thread), thread, event->parent.parent.flag); /* if there is a waiting timeout, active thread timer */ if (timeout > 0) { /* reset the timeout of thread timer and start it */ rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &timeout); rt_timer_start(&(thread->thread_timer)); } /* enable interrupt */ rt_hw_interrupt_enable(level); /* do a schedule */ rt_schedule(); if (thread->error != RT_EOK) { /* return error */ return thread->error; } /* received an event, disable interrupt to protect */ level = rt_hw_interrupt_disable(); /* set received event */ if (recved) *recved = thread->event_set; } /* enable interrupt */ rt_hw_interrupt_enable(level); RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(event->parent.parent))); return thread->error; } RTM_EXPORT(rt_event_recv); /** * @brief This function will set some extra attributions of an event object. * * @note Currently this function only supports the RT_IPC_CMD_RESET command to reset the event. * * @param event is a pointer to an event object. * * @param cmd is a command word used to configure some attributions of the event. * * @param arg is the argument of the function to execute the command. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that this function failed to execute. */ rt_err_t rt_event_control(rt_event_t event, int cmd, void *arg) { rt_ubase_t level; /* parameter check */ RT_ASSERT(event != RT_NULL); RT_ASSERT(rt_object_get_type(&event->parent.parent) == RT_Object_Class_Event); if (cmd == RT_IPC_CMD_RESET) { /* disable interrupt */ level = rt_hw_interrupt_disable(); /* resume all waiting thread */ _ipc_list_resume_all(&event->parent.suspend_thread); /* initialize event set */ event->set = 0; /* enable interrupt */ rt_hw_interrupt_enable(level); rt_schedule(); return RT_EOK; } return -RT_ERROR; } RTM_EXPORT(rt_event_control); /**@}*/ #endif /* RT_USING_EVENT */ #ifdef RT_USING_MAILBOX /** * @addtogroup mailbox */ /**@{*/ /** * @brief Initialize a static mailbox object. * * @note For the static mailbox object, its memory space is allocated by the compiler during compiling, * and shall placed on the read-write data segment or on the uninitialized data segment. * By contrast, the rt_mb_create() function will allocate memory space automatically and initialize the mailbox. * * @see rt_mb_create() * * @param mb is a pointer to the mailbox to initialize. * It is assumed that storage for the mailbox will be allocated in your application. * * @param name is a pointer to the name that given to the mailbox. * * @param size is the maximum number of mails in the mailbox. * For example, when the mailbox buffer capacity is N, size is N/4. * * @param flag is the mailbox flag, which determines the queuing way of how multiple threads wait * when the mailbox is not available. * The mailbox flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this mailbox will become non-real-time threads. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it represents the initialization failed. * * @warning This function can ONLY be called from threads. */ rt_err_t rt_mb_init(rt_mailbox_t mb, const char *name, void *msgpool, rt_size_t size, rt_uint8_t flag) { RT_ASSERT(mb != RT_NULL); RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); /* initialize object */ rt_object_init(&(mb->parent.parent), RT_Object_Class_MailBox, name); /* set parent flag */ mb->parent.parent.flag = flag; /* initialize ipc object */ _ipc_object_init(&(mb->parent)); /* initialize mailbox */ mb->msg_pool = (rt_ubase_t *)msgpool; mb->size = size; mb->entry = 0; mb->in_offset = 0; mb->out_offset = 0; /* initialize an additional list of sender suspend thread */ rt_list_init(&(mb->suspend_sender_thread)); return RT_EOK; } RTM_EXPORT(rt_mb_init); /** * @brief This function will detach a static mailbox object. * * @note This function is used to detach a static mailbox object which is initialized by rt_mb_init() function. * By contrast, the rt_mb_delete() function will delete a mailbox object. * When the mailbox is successfully detached, it will resume all suspended threads in the mailbox list. * * @see rt_mb_delete() * * @param mb is a pointer to a mailbox object to be detached. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it means that the mailbox detach failed. * * @warning This function can ONLY detach a static mailbox initialized by the rt_mb_init() function. * If the mailbox is created by the rt_mb_create() function, you MUST NOT USE this function to detach it, * ONLY USE the rt_mb_delete() function to complete the deletion. */ rt_err_t rt_mb_detach(rt_mailbox_t mb) { /* parameter check */ RT_ASSERT(mb != RT_NULL); RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox); RT_ASSERT(rt_object_is_systemobject(&mb->parent.parent)); /* resume all suspended thread */ _ipc_list_resume_all(&(mb->parent.suspend_thread)); /* also resume all mailbox private suspended thread */ _ipc_list_resume_all(&(mb->suspend_sender_thread)); /* detach mailbox object */ rt_object_detach(&(mb->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_mb_detach); #ifdef RT_USING_HEAP /** * @brief Creating a mailbox object. * * @note For the mailbox object, its memory space is allocated automatically. * By contrast, the rt_mb_init() function will initialize a static mailbox object. * * @see rt_mb_init() * * @param name is a pointer that given to the mailbox. * * @param size is the maximum number of mails in the mailbox. * For example, when mailbox buffer capacity is N, size is N/4. * * @param flag is the mailbox flag, which determines the queuing way of how multiple threads wait * when the mailbox is not available. * The mailbox flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this mailbox will become non-real-time threads. * * @return Return a pointer to the mailbox object. When the return value is RT_NULL, it means the creation failed. * * @warning This function can ONLY be called from threads. */ rt_mailbox_t rt_mb_create(const char *name, rt_size_t size, rt_uint8_t flag) { rt_mailbox_t mb; RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); RT_DEBUG_NOT_IN_INTERRUPT; /* allocate object */ mb = (rt_mailbox_t)rt_object_allocate(RT_Object_Class_MailBox, name); if (mb == RT_NULL) return mb; /* set parent */ mb->parent.parent.flag = flag; /* initialize ipc object */ _ipc_object_init(&(mb->parent)); /* initialize mailbox */ mb->size = size; mb->msg_pool = (rt_ubase_t *)RT_KERNEL_MALLOC(mb->size * sizeof(rt_ubase_t)); if (mb->msg_pool == RT_NULL) { /* delete mailbox object */ rt_object_delete(&(mb->parent.parent)); return RT_NULL; } mb->entry = 0; mb->in_offset = 0; mb->out_offset = 0; /* initialize an additional list of sender suspend thread */ rt_list_init(&(mb->suspend_sender_thread)); return mb; } RTM_EXPORT(rt_mb_create); /** * @brief This function will delete a mailbox object and release the memory space. * * @note This function is used to delete a mailbox object which is created by the rt_mb_create() function. * By contrast, the rt_mb_detach() function will detach a static mailbox object. * When the mailbox is successfully deleted, it will resume all suspended threads in the mailbox list. * * @see rt_mb_detach() * * @param mb is a pointer to a mailbox object to be deleted. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mailbox detach failed. * * @warning This function can only delete mailbox created by the rt_mb_create() function. * If the mailbox is initialized by the rt_mb_init() function, you MUST NOT USE this function to delete it, * ONLY USE the rt_mb_detach() function to complete the detachment. */ rt_err_t rt_mb_delete(rt_mailbox_t mb) { /* parameter check */ RT_ASSERT(mb != RT_NULL); RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox); RT_ASSERT(rt_object_is_systemobject(&mb->parent.parent) == RT_FALSE); RT_DEBUG_NOT_IN_INTERRUPT; /* resume all suspended thread */ _ipc_list_resume_all(&(mb->parent.suspend_thread)); /* also resume all mailbox private suspended thread */ _ipc_list_resume_all(&(mb->suspend_sender_thread)); /* free mailbox pool */ RT_KERNEL_FREE(mb->msg_pool); /* delete mailbox object */ rt_object_delete(&(mb->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_mb_delete); #endif /* RT_USING_HEAP */ /** * @brief This function will send an mail to the mailbox object. If there is a thread suspended on the mailbox, * the thread will be resumed. * * @note When using this function to send a mail, if the mailbox if fully used, the current thread will * wait for a timeout. If the set timeout time is reached and there is still no space available, * the sending thread will be resumed and an error code will be returned. * By contrast, the rt_mb_send() function will return an error code immediately without waiting time * when the mailbox if fully used. * * @see rt_mb_send() * * @param mb is a pointer to the mailbox object to be sent. * * @param value is a value to the content of the mail you want to send. * * @param timeout is a timeout period (unit: an OS tick). * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mailbox detach failed. * * @warning This function can be called in interrupt context and thread context. */ rt_err_t rt_mb_send_wait(rt_mailbox_t mb, rt_ubase_t value, rt_int32_t timeout) { struct rt_thread *thread; register rt_ubase_t temp; rt_uint32_t tick_delta; /* parameter check */ RT_ASSERT(mb != RT_NULL); RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox); /* initialize delta tick */ tick_delta = 0; /* get current thread */ thread = rt_thread_self(); RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mb->parent.parent))); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* for non-blocking call */ if (mb->entry == mb->size && timeout == 0) { rt_hw_interrupt_enable(temp); return -RT_EFULL; } /* mailbox is full */ while (mb->entry == mb->size) { /* reset error number in thread */ thread->error = RT_EOK; /* no waiting, return timeout */ if (timeout == 0) { /* enable interrupt */ rt_hw_interrupt_enable(temp); return -RT_EFULL; } RT_DEBUG_IN_THREAD_CONTEXT; /* suspend current thread */ _ipc_list_suspend(&(mb->suspend_sender_thread), thread, mb->parent.parent.flag); /* has waiting time, start thread timer */ if (timeout > 0) { /* get the start tick of timer */ tick_delta = rt_tick_get(); RT_DEBUG_LOG(RT_DEBUG_IPC, ("mb_send_wait: start timer of thread:%s\n", thread->name)); /* reset the timeout of thread timer and start it */ rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &timeout); rt_timer_start(&(thread->thread_timer)); } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* re-schedule */ rt_schedule(); /* resume from suspend state */ if (thread->error != RT_EOK) { /* return error */ return thread->error; } /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* if it's not waiting forever and then re-calculate timeout tick */ if (timeout > 0) { tick_delta = rt_tick_get() - tick_delta; timeout -= tick_delta; if (timeout < 0) timeout = 0; } } /* set ptr */ mb->msg_pool[mb->in_offset] = value; /* increase input offset */ ++ mb->in_offset; if (mb->in_offset >= mb->size) mb->in_offset = 0; if(mb->entry < RT_MB_ENTRY_MAX) { /* increase message entry */ mb->entry ++; } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } /* resume suspended thread */ if (!rt_list_isempty(&mb->parent.suspend_thread)) { _ipc_list_resume(&(mb->parent.suspend_thread)); /* enable interrupt */ rt_hw_interrupt_enable(temp); rt_schedule(); return RT_EOK; } /* enable interrupt */ rt_hw_interrupt_enable(temp); return RT_EOK; } RTM_EXPORT(rt_mb_send_wait); /** * @brief This function will send an mail to the mailbox object. If there is a thread suspended on the mailbox, * the thread will be resumed. * * @note When using this function to send a mail, if the mailbox is fully used, this function will return an error * code immediately without waiting time. * By contrast, the rt_mb_send_wait() function is set a timeout to wait for the mail to be sent. * * @see rt_mb_send_wait() * * @param mb is a pointer to the mailbox object to be sent. * * @param value is a value to the content of the mail you want to send. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mailbox detach failed. */ rt_err_t rt_mb_send(rt_mailbox_t mb, rt_ubase_t value) { return rt_mb_send_wait(mb, value, 0); } RTM_EXPORT(rt_mb_send); /** * @brief This function will send an urgent mail to the mailbox object. * * @note This function is almost the same as the rt_mb_send() function. The only difference is that * when sending an urgent mail, the mail will be placed at the head of the mail queue so that * the recipient can receive the urgent mail first. * * @see rt_mb_send() * * @param mb is a pointer to the mailbox object to be sent. * * @param value is the content of the mail you want to send. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mailbox detach failed. */ rt_err_t rt_mb_urgent(rt_mailbox_t mb, rt_ubase_t value) { register rt_ubase_t temp; /* parameter check */ RT_ASSERT(mb != RT_NULL); RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox); RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mb->parent.parent))); /* disable interrupt */ temp = rt_hw_interrupt_disable(); if (mb->entry == mb->size) { rt_hw_interrupt_enable(temp); return -RT_EFULL; } /* rewind to the previous position */ if (mb->out_offset > 0) { mb->out_offset --; } else { mb->out_offset = mb->size - 1; } /* set ptr */ mb->msg_pool[mb->out_offset] = value; /* increase message entry */ mb->entry ++; /* resume suspended thread */ if (!rt_list_isempty(&mb->parent.suspend_thread)) { _ipc_list_resume(&(mb->parent.suspend_thread)); /* enable interrupt */ rt_hw_interrupt_enable(temp); rt_schedule(); return RT_EOK; } /* enable interrupt */ rt_hw_interrupt_enable(temp); return RT_EOK; } RTM_EXPORT(rt_mb_urgent); /** * @brief This function will receive a mail from mailbox object, if there is no mail in mailbox object, * the thread shall wait for a specified time. * * @note Only when there is mail in the mailbox, the receiving thread can get the mail immediately and * return RT_EOK, otherwise the receiving thread will be suspended until the set timeout. If the mail * is still not received within the specified time, it will return-RT_ETIMEOUT. * * @param mb is a pointer to the mailbox object to be received. * * @param value is a flag that you will set for this mailbox's flag. * You can set an mailbox flag, or you can set multiple flags through OR logic operations. * * @param timeout is a timeout period (unit: an OS tick). * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mailbox release failed. */ rt_err_t rt_mb_recv(rt_mailbox_t mb, rt_ubase_t *value, rt_int32_t timeout) { struct rt_thread *thread; register rt_ubase_t temp; rt_uint32_t tick_delta; /* parameter check */ RT_ASSERT(mb != RT_NULL); RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox); /* initialize delta tick */ tick_delta = 0; /* get current thread */ thread = rt_thread_self(); RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(mb->parent.parent))); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* for non-blocking call */ if (mb->entry == 0 && timeout == 0) { rt_hw_interrupt_enable(temp); return -RT_ETIMEOUT; } /* mailbox is empty */ while (mb->entry == 0) { /* reset error number in thread */ thread->error = RT_EOK; /* no waiting, return timeout */ if (timeout == 0) { /* enable interrupt */ rt_hw_interrupt_enable(temp); thread->error = -RT_ETIMEOUT; return -RT_ETIMEOUT; } RT_DEBUG_IN_THREAD_CONTEXT; /* suspend current thread */ _ipc_list_suspend(&(mb->parent.suspend_thread), thread, mb->parent.parent.flag); /* has waiting time, start thread timer */ if (timeout > 0) { /* get the start tick of timer */ tick_delta = rt_tick_get(); RT_DEBUG_LOG(RT_DEBUG_IPC, ("mb_recv: start timer of thread:%s\n", thread->name)); /* reset the timeout of thread timer and start it */ rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &timeout); rt_timer_start(&(thread->thread_timer)); } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* re-schedule */ rt_schedule(); /* resume from suspend state */ if (thread->error != RT_EOK) { /* return error */ return thread->error; } /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* if it's not waiting forever and then re-calculate timeout tick */ if (timeout > 0) { tick_delta = rt_tick_get() - tick_delta; timeout -= tick_delta; if (timeout < 0) timeout = 0; } } /* fill ptr */ *value = mb->msg_pool[mb->out_offset]; /* increase output offset */ ++ mb->out_offset; if (mb->out_offset >= mb->size) mb->out_offset = 0; /* decrease message entry */ if(mb->entry > 0) { mb->entry --; } /* resume suspended thread */ if (!rt_list_isempty(&(mb->suspend_sender_thread))) { _ipc_list_resume(&(mb->suspend_sender_thread)); /* enable interrupt */ rt_hw_interrupt_enable(temp); RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mb->parent.parent))); rt_schedule(); return RT_EOK; } /* enable interrupt */ rt_hw_interrupt_enable(temp); RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mb->parent.parent))); return RT_EOK; } RTM_EXPORT(rt_mb_recv); /** * @brief This function will set some extra attributions of a mailbox object. * * @note Currently this function only supports the RT_IPC_CMD_RESET command to reset the mailbox. * * @param mb is a pointer to a mailbox object. * * @param cmd is a command used to configure some attributions of the mailbox. * * @param arg is the argument of the function to execute the command. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that this function failed to execute. */ rt_err_t rt_mb_control(rt_mailbox_t mb, int cmd, void *arg) { rt_ubase_t level; /* parameter check */ RT_ASSERT(mb != RT_NULL); RT_ASSERT(rt_object_get_type(&mb->parent.parent) == RT_Object_Class_MailBox); if (cmd == RT_IPC_CMD_RESET) { /* disable interrupt */ level = rt_hw_interrupt_disable(); /* resume all waiting thread */ _ipc_list_resume_all(&(mb->parent.suspend_thread)); /* also resume all mailbox private suspended thread */ _ipc_list_resume_all(&(mb->suspend_sender_thread)); /* re-init mailbox */ mb->entry = 0; mb->in_offset = 0; mb->out_offset = 0; /* enable interrupt */ rt_hw_interrupt_enable(level); rt_schedule(); return RT_EOK; } return -RT_ERROR; } RTM_EXPORT(rt_mb_control); /**@}*/ #endif /* RT_USING_MAILBOX */ #ifdef RT_USING_MESSAGEQUEUE /** * @addtogroup messagequeue */ /**@{*/ struct rt_mq_message { struct rt_mq_message *next; }; /** * @brief Initialize a static messagequeue object. * * @note For the static messagequeue object, its memory space is allocated by the compiler during compiling, * and shall placed on the read-write data segment or on the uninitialized data segment. * By contrast, the rt_mq_create() function will allocate memory space automatically * and initialize the messagequeue. * * @see rt_mq_create() * * @param mq is a pointer to the messagequeue to initialize. It is assumed that storage for * the messagequeue will be allocated in your application. * * @param name is a pointer to the name that given to the messagequeue. * * @param msgpool is a pointer to the starting address of the memory space you allocated for * the messagequeue in advance. * In other words, msgpool is a pointer to the messagequeue buffer of the starting address. * * @param msg_size is the maximum length of a message in the messagequeue (Unit: Byte). * * @param pool_size is the size of the memory space allocated for the messagequeue in advance. * * @param flag is the messagequeue flag, which determines the queuing way of how multiple threads wait * when the messagequeue is not available. * The messagequeue flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this messagequeue will become non-real-time threads. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it represents the initialization failed. * * @warning This function can ONLY be called from threads. */ rt_err_t rt_mq_init(rt_mq_t mq, const char *name, void *msgpool, rt_size_t msg_size, rt_size_t pool_size, rt_uint8_t flag) { struct rt_mq_message *head; register rt_base_t temp; /* parameter check */ RT_ASSERT(mq != RT_NULL); RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); /* initialize object */ rt_object_init(&(mq->parent.parent), RT_Object_Class_MessageQueue, name); /* set parent flag */ mq->parent.parent.flag = flag; /* initialize ipc object */ _ipc_object_init(&(mq->parent)); /* set message pool */ mq->msg_pool = msgpool; /* get correct message size */ mq->msg_size = RT_ALIGN(msg_size, RT_ALIGN_SIZE); mq->max_msgs = pool_size / (mq->msg_size + sizeof(struct rt_mq_message)); /* initialize message list */ mq->msg_queue_head = RT_NULL; mq->msg_queue_tail = RT_NULL; /* initialize message empty list */ mq->msg_queue_free = RT_NULL; for (temp = 0; temp < mq->max_msgs; temp ++) { head = (struct rt_mq_message *)((rt_uint8_t *)mq->msg_pool + temp * (mq->msg_size + sizeof(struct rt_mq_message))); head->next = (struct rt_mq_message *)mq->msg_queue_free; mq->msg_queue_free = head; } /* the initial entry is zero */ mq->entry = 0; /* initialize an additional list of sender suspend thread */ rt_list_init(&(mq->suspend_sender_thread)); return RT_EOK; } RTM_EXPORT(rt_mq_init); /** * @brief This function will detach a static messagequeue object. * * @note This function is used to detach a static messagequeue object which is initialized by rt_mq_init() function. * By contrast, the rt_mq_delete() function will delete a messagequeue object. * When the messagequeue is successfully detached, it will resume all suspended threads in the messagequeue list. * * @see rt_mq_delete() * * @param mq is a pointer to a messagequeue object to be detached. * * @return Return the operation status. When the return value is RT_EOK, the initialization is successful. * If the return value is any other values, it means that the messagequeue detach failed. * * @warning This function can ONLY detach a static messagequeue initialized by the rt_mq_init() function. * If the messagequeue is created by the rt_mq_create() function, you MUST NOT USE this function to detach it, * and ONLY USE the rt_mq_delete() function to complete the deletion. */ rt_err_t rt_mq_detach(rt_mq_t mq) { /* parameter check */ RT_ASSERT(mq != RT_NULL); RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue); RT_ASSERT(rt_object_is_systemobject(&mq->parent.parent)); /* resume all suspended thread */ _ipc_list_resume_all(&mq->parent.suspend_thread); /* also resume all message queue private suspended thread */ _ipc_list_resume_all(&(mq->suspend_sender_thread)); /* detach message queue object */ rt_object_detach(&(mq->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_mq_detach); #ifdef RT_USING_HEAP /** * @brief Creating a messagequeue object. * * @note For the messagequeue object, its memory space is allocated automatically. * By contrast, the rt_mq_init() function will initialize a static messagequeue object. * * @see rt_mq_init() * * @param name is a pointer that given to the messagequeue. * * @param msg_size is the maximum length of a message in the messagequeue (Unit: Byte). * * @param max_msgs is the maximum number of messages in the messagequeue. * * @param flag is the messagequeue flag, which determines the queuing way of how multiple threads wait * when the messagequeue is not available. * The messagequeue flag can be ONE of the following values: * * RT_IPC_FLAG_PRIO The pending threads will queue in order of priority. * * RT_IPC_FLAG_FIFO The pending threads will queue in the first-in-first-out method * (also known as first-come-first-served (FCFS) scheduling strategy). * * NOTE: RT_IPC_FLAG_FIFO is a non-real-time scheduling mode. It is strongly recommended to * use RT_IPC_FLAG_PRIO to ensure the thread is real-time UNLESS your applications concern about * the first-in-first-out principle, and you clearly understand that all threads involved in * this messagequeue will become non-real-time threads. * * @return Return a pointer to the messagequeue object. When the return value is RT_NULL, it means the creation failed. * * @warning This function can NOT be called in interrupt context. You can use macor RT_DEBUG_NOT_IN_INTERRUPT to check it. */ rt_mq_t rt_mq_create(const char *name, rt_size_t msg_size, rt_size_t max_msgs, rt_uint8_t flag) { struct rt_messagequeue *mq; struct rt_mq_message *head; register rt_base_t temp; RT_ASSERT((flag == RT_IPC_FLAG_FIFO) || (flag == RT_IPC_FLAG_PRIO)); RT_DEBUG_NOT_IN_INTERRUPT; /* allocate object */ mq = (rt_mq_t)rt_object_allocate(RT_Object_Class_MessageQueue, name); if (mq == RT_NULL) return mq; /* set parent */ mq->parent.parent.flag = flag; /* initialize ipc object */ _ipc_object_init(&(mq->parent)); /* initialize message queue */ /* get correct message size */ mq->msg_size = RT_ALIGN(msg_size, RT_ALIGN_SIZE); mq->max_msgs = max_msgs; /* allocate message pool */ mq->msg_pool = RT_KERNEL_MALLOC((mq->msg_size + sizeof(struct rt_mq_message)) * mq->max_msgs); if (mq->msg_pool == RT_NULL) { rt_object_delete(&(mq->parent.parent)); return RT_NULL; } /* initialize message list */ mq->msg_queue_head = RT_NULL; mq->msg_queue_tail = RT_NULL; /* initialize message empty list */ mq->msg_queue_free = RT_NULL; for (temp = 0; temp < mq->max_msgs; temp ++) { head = (struct rt_mq_message *)((rt_uint8_t *)mq->msg_pool + temp * (mq->msg_size + sizeof(struct rt_mq_message))); head->next = (struct rt_mq_message *)mq->msg_queue_free; mq->msg_queue_free = head; } /* the initial entry is zero */ mq->entry = 0; /* initialize an additional list of sender suspend thread */ rt_list_init(&(mq->suspend_sender_thread)); return mq; } RTM_EXPORT(rt_mq_create); /** * @brief This function will delete a messagequeue object and release the memory. * * @note This function is used to delete a messagequeue object which is created by the rt_mq_create() function. * By contrast, the rt_mq_detach() function will detach a static messagequeue object. * When the messagequeue is successfully deleted, it will resume all suspended threads in the messagequeue list. * * @see rt_mq_detach() * * @param mq is a pointer to a messagequeue object to be deleted. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the messagequeue detach failed. * * @warning This function can ONLY delete a messagequeue initialized by the rt_mq_create() function. * If the messagequeue is initialized by the rt_mq_init() function, you MUST NOT USE this function to delete it, * ONLY USE the rt_mq_detach() function to complete the detachment. * for example,the rt_mq_create() function, it cannot be called in interrupt context. */ rt_err_t rt_mq_delete(rt_mq_t mq) { /* parameter check */ RT_ASSERT(mq != RT_NULL); RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue); RT_ASSERT(rt_object_is_systemobject(&mq->parent.parent) == RT_FALSE); RT_DEBUG_NOT_IN_INTERRUPT; /* resume all suspended thread */ _ipc_list_resume_all(&(mq->parent.suspend_thread)); /* also resume all message queue private suspended thread */ _ipc_list_resume_all(&(mq->suspend_sender_thread)); /* free message queue pool */ RT_KERNEL_FREE(mq->msg_pool); /* delete message queue object */ rt_object_delete(&(mq->parent.parent)); return RT_EOK; } RTM_EXPORT(rt_mq_delete); #endif /* RT_USING_HEAP */ /** * @brief This function will send a message to the messagequeue object. If * there is a thread suspended on the messagequeue, the thread will be * resumed. * * @note When using this function to send a message, if the messagequeue is * fully used, the current thread will wait for a timeout. If reaching * the timeout and there is still no space available, the sending * thread will be resumed and an error code will be returned. By * contrast, the rt_mq_send() function will return an error code * immediately without waiting when the messagequeue if fully used. * * @see rt_mq_send() * * @param mq is a pointer to the messagequeue object to be sent. * * @param buffer is the content of the message. * * @param size is the length of the message(Unit: Byte). * * @param timeout is a timeout period (unit: an OS tick). * * @return Return the operation status. When the return value is RT_EOK, the * operation is successful. If the return value is any other values, * it means that the messagequeue detach failed. * * @warning This function can be called in interrupt context and thread * context. */ rt_err_t rt_mq_send_wait(rt_mq_t mq, const void *buffer, rt_size_t size, rt_int32_t timeout) { register rt_ubase_t temp; struct rt_mq_message *msg; rt_uint32_t tick_delta; struct rt_thread *thread; /* parameter check */ RT_ASSERT(mq != RT_NULL); RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue); RT_ASSERT(buffer != RT_NULL); RT_ASSERT(size != 0); /* greater than one message size */ if (size > mq->msg_size) return -RT_ERROR; /* initialize delta tick */ tick_delta = 0; /* get current thread */ thread = rt_thread_self(); RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mq->parent.parent))); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* get a free list, there must be an empty item */ msg = (struct rt_mq_message *)mq->msg_queue_free; /* for non-blocking call */ if (msg == RT_NULL && timeout == 0) { /* enable interrupt */ rt_hw_interrupt_enable(temp); return -RT_EFULL; } /* message queue is full */ while ((msg = (struct rt_mq_message *)mq->msg_queue_free) == RT_NULL) { /* reset error number in thread */ thread->error = RT_EOK; /* no waiting, return timeout */ if (timeout == 0) { /* enable interrupt */ rt_hw_interrupt_enable(temp); return -RT_EFULL; } RT_DEBUG_IN_THREAD_CONTEXT; /* suspend current thread */ _ipc_list_suspend(&(mq->suspend_sender_thread), thread, mq->parent.parent.flag); /* has waiting time, start thread timer */ if (timeout > 0) { /* get the start tick of timer */ tick_delta = rt_tick_get(); RT_DEBUG_LOG(RT_DEBUG_IPC, ("mq_send_wait: start timer of thread:%s\n", thread->name)); /* reset the timeout of thread timer and start it */ rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &timeout); rt_timer_start(&(thread->thread_timer)); } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* re-schedule */ rt_schedule(); /* resume from suspend state */ if (thread->error != RT_EOK) { /* return error */ return thread->error; } /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* if it's not waiting forever and then re-calculate timeout tick */ if (timeout > 0) { tick_delta = rt_tick_get() - tick_delta; timeout -= tick_delta; if (timeout < 0) timeout = 0; } } /* move free list pointer */ mq->msg_queue_free = msg->next; /* enable interrupt */ rt_hw_interrupt_enable(temp); /* the msg is the new tailer of list, the next shall be NULL */ msg->next = RT_NULL; /* copy buffer */ rt_memcpy(msg + 1, buffer, size); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* link msg to message queue */ if (mq->msg_queue_tail != RT_NULL) { /* if the tail exists, */ ((struct rt_mq_message *)mq->msg_queue_tail)->next = msg; } /* set new tail */ mq->msg_queue_tail = msg; /* if the head is empty, set head */ if (mq->msg_queue_head == RT_NULL) mq->msg_queue_head = msg; if(mq->entry < RT_MQ_ENTRY_MAX) { /* increase message entry */ mq->entry ++; } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } /* resume suspended thread */ if (!rt_list_isempty(&mq->parent.suspend_thread)) { _ipc_list_resume(&(mq->parent.suspend_thread)); /* enable interrupt */ rt_hw_interrupt_enable(temp); rt_schedule(); return RT_EOK; } /* enable interrupt */ rt_hw_interrupt_enable(temp); return RT_EOK; } RTM_EXPORT(rt_mq_send_wait) /** * @brief This function will send a message to the messagequeue object. * If there is a thread suspended on the messagequeue, the thread will be resumed. * * @note When using this function to send a message, if the messagequeue is fully used, * the current thread will wait for a timeout. * By contrast, when the messagequeue is fully used, the rt_mq_send_wait() function will * return an error code immediately without waiting. * * @see rt_mq_send_wait() * * @param mq is a pointer to the messagequeue object to be sent. * * @param buffer is the content of the message. * * @param size is the length of the message(Unit: Byte). * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the messagequeue detach failed. * * @warning This function can be called in interrupt context and thread context. */ rt_err_t rt_mq_send(rt_mq_t mq, const void *buffer, rt_size_t size) { return rt_mq_send_wait(mq, buffer, size, 0); } RTM_EXPORT(rt_mq_send); /** * @brief This function will send an urgent message to the messagequeue object. * * @note This function is almost the same as the rt_mq_send() function. The only difference is that * when sending an urgent message, the message is placed at the head of the messagequeue so that * the recipient can receive the urgent message first. * * @see rt_mq_send() * * @param mq is a pointer to the messagequeue object to be sent. * * @param buffer is the content of the message. * * @param size is the length of the message(Unit: Byte). * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mailbox detach failed. */ rt_err_t rt_mq_urgent(rt_mq_t mq, const void *buffer, rt_size_t size) { register rt_ubase_t temp; struct rt_mq_message *msg; /* parameter check */ RT_ASSERT(mq != RT_NULL); RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue); RT_ASSERT(buffer != RT_NULL); RT_ASSERT(size != 0); /* greater than one message size */ if (size > mq->msg_size) return -RT_ERROR; RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mq->parent.parent))); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* get a free list, there must be an empty item */ msg = (struct rt_mq_message *)mq->msg_queue_free; /* message queue is full */ if (msg == RT_NULL) { /* enable interrupt */ rt_hw_interrupt_enable(temp); return -RT_EFULL; } /* move free list pointer */ mq->msg_queue_free = msg->next; /* enable interrupt */ rt_hw_interrupt_enable(temp); /* copy buffer */ rt_memcpy(msg + 1, buffer, size); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* link msg to the beginning of message queue */ msg->next = (struct rt_mq_message *)mq->msg_queue_head; mq->msg_queue_head = msg; /* if there is no tail */ if (mq->msg_queue_tail == RT_NULL) mq->msg_queue_tail = msg; if(mq->entry < RT_MQ_ENTRY_MAX) { /* increase message entry */ mq->entry ++; } else { rt_hw_interrupt_enable(temp); /* enable interrupt */ return -RT_EFULL; /* value overflowed */ } /* resume suspended thread */ if (!rt_list_isempty(&mq->parent.suspend_thread)) { _ipc_list_resume(&(mq->parent.suspend_thread)); /* enable interrupt */ rt_hw_interrupt_enable(temp); rt_schedule(); return RT_EOK; } /* enable interrupt */ rt_hw_interrupt_enable(temp); return RT_EOK; } RTM_EXPORT(rt_mq_urgent); /** * @brief This function will receive a message from message queue object, * if there is no message in messagequeue object, the thread shall wait for a specified time. * * @note Only when there is mail in the mailbox, the receiving thread can get the mail immediately and return RT_EOK, * otherwise the receiving thread will be suspended until timeout. * If the mail is not received within the specified time, it will return -RT_ETIMEOUT. * * @param mq is a pointer to the messagequeue object to be received. * * @param buffer is the content of the message. * * @param size is the length of the message(Unit: Byte). * * @param timeout is a timeout period (unit: an OS tick). * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that the mailbox release failed. */ rt_err_t rt_mq_recv(rt_mq_t mq, void *buffer, rt_size_t size, rt_int32_t timeout) { struct rt_thread *thread; register rt_ubase_t temp; struct rt_mq_message *msg; rt_uint32_t tick_delta; /* parameter check */ RT_ASSERT(mq != RT_NULL); RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue); RT_ASSERT(buffer != RT_NULL); RT_ASSERT(size != 0); /* initialize delta tick */ tick_delta = 0; /* get current thread */ thread = rt_thread_self(); RT_OBJECT_HOOK_CALL(rt_object_trytake_hook, (&(mq->parent.parent))); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* for non-blocking call */ if (mq->entry == 0 && timeout == 0) { rt_hw_interrupt_enable(temp); return -RT_ETIMEOUT; } /* message queue is empty */ while (mq->entry == 0) { RT_DEBUG_IN_THREAD_CONTEXT; /* reset error number in thread */ thread->error = RT_EOK; /* no waiting, return timeout */ if (timeout == 0) { /* enable interrupt */ rt_hw_interrupt_enable(temp); thread->error = -RT_ETIMEOUT; return -RT_ETIMEOUT; } /* suspend current thread */ _ipc_list_suspend(&(mq->parent.suspend_thread), thread, mq->parent.parent.flag); /* has waiting time, start thread timer */ if (timeout > 0) { /* get the start tick of timer */ tick_delta = rt_tick_get(); RT_DEBUG_LOG(RT_DEBUG_IPC, ("set thread:%s to timer list\n", thread->name)); /* reset the timeout of thread timer and start it */ rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, &timeout); rt_timer_start(&(thread->thread_timer)); } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* re-schedule */ rt_schedule(); /* recv message */ if (thread->error != RT_EOK) { /* return error */ return thread->error; } /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* if it's not waiting forever and then re-calculate timeout tick */ if (timeout > 0) { tick_delta = rt_tick_get() - tick_delta; timeout -= tick_delta; if (timeout < 0) timeout = 0; } } /* get message from queue */ msg = (struct rt_mq_message *)mq->msg_queue_head; /* move message queue head */ mq->msg_queue_head = msg->next; /* reach queue tail, set to NULL */ if (mq->msg_queue_tail == msg) mq->msg_queue_tail = RT_NULL; /* decrease message entry */ if(mq->entry > 0) { mq->entry --; } /* enable interrupt */ rt_hw_interrupt_enable(temp); /* copy message */ rt_memcpy(buffer, msg + 1, size > mq->msg_size ? mq->msg_size : size); /* disable interrupt */ temp = rt_hw_interrupt_disable(); /* put message to free list */ msg->next = (struct rt_mq_message *)mq->msg_queue_free; mq->msg_queue_free = msg; /* resume suspended thread */ if (!rt_list_isempty(&(mq->suspend_sender_thread))) { _ipc_list_resume(&(mq->suspend_sender_thread)); /* enable interrupt */ rt_hw_interrupt_enable(temp); RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mq->parent.parent))); rt_schedule(); return RT_EOK; } /* enable interrupt */ rt_hw_interrupt_enable(temp); RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(mq->parent.parent))); return RT_EOK; } RTM_EXPORT(rt_mq_recv); /** * @brief This function will set some extra attributions of a messagequeue object. * * @note Currently this function only supports the RT_IPC_CMD_RESET command to reset the messagequeue. * * @param mq is a pointer to a messagequeue object. * * @param cmd is a command used to configure some attributions of the messagequeue. * * @param arg is the argument of the function to execute the command. * * @return Return the operation status. When the return value is RT_EOK, the operation is successful. * If the return value is any other values, it means that this function failed to execute. */ rt_err_t rt_mq_control(rt_mq_t mq, int cmd, void *arg) { rt_ubase_t level; struct rt_mq_message *msg; /* parameter check */ RT_ASSERT(mq != RT_NULL); RT_ASSERT(rt_object_get_type(&mq->parent.parent) == RT_Object_Class_MessageQueue); if (cmd == RT_IPC_CMD_RESET) { /* disable interrupt */ level = rt_hw_interrupt_disable(); /* resume all waiting thread */ _ipc_list_resume_all(&mq->parent.suspend_thread); /* also resume all message queue private suspended thread */ _ipc_list_resume_all(&(mq->suspend_sender_thread)); /* release all message in the queue */ while (mq->msg_queue_head != RT_NULL) { /* get message from queue */ msg = (struct rt_mq_message *)mq->msg_queue_head; /* move message queue head */ mq->msg_queue_head = msg->next; /* reach queue tail, set to NULL */ if (mq->msg_queue_tail == msg) mq->msg_queue_tail = RT_NULL; /* put message to free list */ msg->next = (struct rt_mq_message *)mq->msg_queue_free; mq->msg_queue_free = msg; } /* clean entry */ mq->entry = 0; /* enable interrupt */ rt_hw_interrupt_enable(level); rt_schedule(); return RT_EOK; } return -RT_ERROR; } RTM_EXPORT(rt_mq_control); /**@}*/ #endif /* RT_USING_MESSAGEQUEUE */ /**@}*/