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rt-thread-official/src/ipc.c

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/*
* File : ipc.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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
*/
#include <rtthread.h>
#include <rthw.h>
#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
/**
* @addtogroup IPC
*/
/**@{*/
/**
* This function will initialize an IPC object
*
* @param ipc the IPC object
*
* @return the operation status, RT_EOK on successful
*/
rt_inline rt_err_t rt_ipc_object_init(struct rt_ipc_object *ipc)
{
/* init ipc object */
rt_list_init(&(ipc->suspend_thread));
return RT_EOK;
}
/**
* This function will suspend a thread to a specified list. IPC object or some
* double-queue object (mailbox etc.) contains this kind of list.
*
* @param list the IPC suspended thread list
* @param thread the thread object to be suspended
* @param flag the IPC object flag,
* which shall be RT_IPC_FLAG_FIFO/RT_IPC_FLAG_PRIO.
*
* @return the operation status, RT_EOK on successful
*/
rt_inline rt_err_t rt_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;
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;
}
return RT_EOK;
}
/**
* This function will resume the first thread in the list of a IPC object:
* - remove the thread from suspend queue of IPC object
* - put the thread into system ready queue
*
* @param list the thread list
*
* @return the operation status, RT_EOK on successful
*/
rt_inline rt_err_t rt_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;
}
/**
* This function will resume all suspended threads in a list, including
* suspend list of IPC object and private list of mailbox etc.
*
* @param list of the threads to resume
*
* @return the operation status, RT_EOK on successful
*/
rt_inline rt_err_t rt_ipc_list_resume_all(rt_list_t *list)
{
struct rt_thread *thread;
register rt_ubase_t temp;
/* wakeup all suspend threads */
while (!rt_list_isempty(list))
{
/* disable interrupt */
temp = rt_hw_interrupt_disable();
/* get next suspend 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
* suspend list
*/
rt_thread_resume(thread);
/* enable interrupt */
rt_hw_interrupt_enable(temp);
}
return RT_EOK;
}
#ifdef RT_USING_SEMAPHORE
/**
* This function will initialize a semaphore and put it under control of
* resource management.
*
* @param sem the semaphore object
* @param name the name of semaphore
* @param value the init value of semaphore
* @param flag the flag of semaphore
*
* @return the operation status, RT_EOK on successful
*/
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);
/* init object */
rt_object_init(&(sem->parent.parent), RT_Object_Class_Semaphore, name);
/* init ipc object */
rt_ipc_object_init(&(sem->parent));
/* set init value */
sem->value = value;
/* set parent */
sem->parent.parent.flag = flag;
return RT_EOK;
}
RTM_EXPORT(rt_sem_init);
/**
* This function will detach a semaphore from resource management
*
* @param sem the semaphore object
*
* @return the operation status, RT_EOK on successful
*
* @see rt_sem_delete
*/
rt_err_t rt_sem_detach(rt_sem_t sem)
{
RT_ASSERT(sem != RT_NULL);
/* wakeup all suspend threads */
rt_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
/**
* This function will create a semaphore from system resource
*
* @param name the name of semaphore
* @param value the init value of semaphore
* @param flag the flag of semaphore
*
* @return the created semaphore, RT_NULL on error happen
*
* @see rt_sem_init
*/
rt_sem_t rt_sem_create(const char *name, rt_uint32_t value, rt_uint8_t flag)
{
rt_sem_t sem;
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;
/* init ipc object */
rt_ipc_object_init(&(sem->parent));
/* set init value */
sem->value = value;
/* set parent */
sem->parent.parent.flag = flag;
return sem;
}
RTM_EXPORT(rt_sem_create);
/**
* This function will delete a semaphore object and release the memory
*
* @param sem the semaphore object
*
* @return the error code
*
* @see rt_sem_detach
*/
rt_err_t rt_sem_delete(rt_sem_t sem)
{
RT_DEBUG_NOT_IN_INTERRUPT;
RT_ASSERT(sem != RT_NULL);
/* wakeup all suspend threads */
rt_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
/**
* This function will take a semaphore, if the semaphore is unavailable, the
* thread shall wait for a specified time.
*
* @param sem the semaphore object
* @param time the waiting time
*
* @return the error code
*/
rt_err_t rt_sem_take(rt_sem_t sem, rt_int32_t time)
{
register rt_base_t temp;
struct rt_thread *thread;
RT_ASSERT(sem != RT_NULL);
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 */
rt_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);
/**
* This function will try to take a semaphore and immediately return
*
* @param sem the semaphore object
*
* @return the error code
*/
rt_err_t rt_sem_trytake(rt_sem_t sem)
{
return rt_sem_take(sem, 0);
}
RTM_EXPORT(rt_sem_trytake);
/**
* This function will release a semaphore, if there are threads suspended on
* semaphore, it will be waked up.
*
* @param sem the semaphore object
*
* @return the error code
*/
rt_err_t rt_sem_release(rt_sem_t sem)
{
register rt_base_t temp;
register rt_bool_t need_schedule;
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 */
rt_ipc_list_resume(&(sem->parent.suspend_thread));
need_schedule = RT_TRUE;
}
else
sem->value ++; /* increase value */
/* 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);
/**
* This function can get or set some extra attributions of a semaphore object.
*
* @param sem the semaphore object
* @param cmd the execution command
* @param arg the execution argument
*
* @return the error code
*/
rt_err_t rt_sem_control(rt_sem_t sem, int cmd, void *arg)
{
rt_ubase_t level;
RT_ASSERT(sem != RT_NULL);
if (cmd == RT_IPC_CMD_RESET)
{
rt_uint32_t value;
/* get value */
value = (rt_uint32_t)arg;
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* resume all waiting thread */
rt_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 /* end of RT_USING_SEMAPHORE */
#ifdef RT_USING_MUTEX
/**
* This function will initialize a mutex and put it under control of resource
* management.
*
* @param mutex the mutex object
* @param name the name of mutex
* @param flag the flag of mutex
*
* @return the operation status, RT_EOK on successful
*/
rt_err_t rt_mutex_init(rt_mutex_t mutex, const char *name, rt_uint8_t flag)
{
RT_ASSERT(mutex != RT_NULL);
/* init object */
rt_object_init(&(mutex->parent.parent), RT_Object_Class_Mutex, name);
/* init ipc object */
rt_ipc_object_init(&(mutex->parent));
mutex->value = 1;
mutex->owner = RT_NULL;
mutex->original_priority = 0xFF;
mutex->hold = 0;
/* set flag */
mutex->parent.parent.flag = flag;
return RT_EOK;
}
RTM_EXPORT(rt_mutex_init);
/**
* This function will detach a mutex from resource management
*
* @param mutex the mutex object
*
* @return the operation status, RT_EOK on successful
*
* @see rt_mutex_delete
*/
rt_err_t rt_mutex_detach(rt_mutex_t mutex)
{
RT_ASSERT(mutex != RT_NULL);
/* wakeup all suspend threads */
rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
/* detach semaphore object */
rt_object_detach(&(mutex->parent.parent));
return RT_EOK;
}
RTM_EXPORT(rt_mutex_detach);
#ifdef RT_USING_HEAP
/**
* This function will create a mutex from system resource
*
* @param name the name of mutex
* @param flag the flag of mutex
*
* @return the created mutex, RT_NULL on error happen
*
* @see rt_mutex_init
*/
rt_mutex_t rt_mutex_create(const char *name, rt_uint8_t flag)
{
struct rt_mutex *mutex;
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;
/* init ipc object */
rt_ipc_object_init(&(mutex->parent));
mutex->value = 1;
mutex->owner = RT_NULL;
mutex->original_priority = 0xFF;
mutex->hold = 0;
/* set flag */
mutex->parent.parent.flag = flag;
return mutex;
}
RTM_EXPORT(rt_mutex_create);
/**
* This function will delete a mutex object and release the memory
*
* @param mutex the mutex object
*
* @return the error code
*
* @see rt_mutex_detach
*/
rt_err_t rt_mutex_delete(rt_mutex_t mutex)
{
RT_DEBUG_NOT_IN_INTERRUPT;
RT_ASSERT(mutex != RT_NULL);
/* wakeup all suspend threads */
rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
/* delete semaphore object */
rt_object_delete(&(mutex->parent.parent));
return RT_EOK;
}
RTM_EXPORT(rt_mutex_delete);
#endif
/**
* This function will take a mutex, if the mutex is unavailable, the
* thread shall wait for a specified time.
*
* @param mutex the mutex object
* @param time the waiting time
*
* @return the error code
*/
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;
RT_ASSERT(mutex != RT_NULL);
/* 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)
{
/* it's the same thread */
mutex->hold ++;
}
else
{
__again:
/* 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;
mutex->hold ++;
}
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 */
rt_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)
{
/* interrupt by signal, try it again */
if (thread->error == -RT_EINTR) goto __again;
/* 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);
/**
* This function will release a mutex, if there are threads suspended on mutex,
* it will be waked up.
*
* @param mutex the mutex object
*
* @return the error code
*/
rt_err_t rt_mutex_release(rt_mutex_t mutex)
{
register rt_base_t temp;
struct rt_thread *thread;
rt_bool_t need_schedule;
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;
mutex->hold ++;
/* resume thread */
rt_ipc_list_resume(&(mutex->parent.suspend_thread));
need_schedule = RT_TRUE;
}
else
{
/* increase value */
mutex->value ++;
/* 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);
/**
* This function can get or set some extra attributions of a mutex object.
*
* @param mutex the mutex object
* @param cmd the execution command
* @param arg the execution argument
*
* @return the error code
*/
rt_err_t rt_mutex_control(rt_mutex_t mutex, int cmd, void *arg)
{
return -RT_ERROR;
}
RTM_EXPORT(rt_mutex_control);
#endif /* end of RT_USING_MUTEX */
#ifdef RT_USING_EVENT
/**
* This function will initialize an event and put it under control of resource
* management.
*
* @param event the event object
* @param name the name of event
* @param flag the flag of event
*
* @return the operation status, RT_EOK on successful
*/
rt_err_t rt_event_init(rt_event_t event, const char *name, rt_uint8_t flag)
{
RT_ASSERT(event != RT_NULL);
/* init object */
rt_object_init(&(event->parent.parent), RT_Object_Class_Event, name);
/* set parent flag */
event->parent.parent.flag = flag;
/* init ipc object */
rt_ipc_object_init(&(event->parent));
/* init event */
event->set = 0;
return RT_EOK;
}
RTM_EXPORT(rt_event_init);
/**
* This function will detach an event object from resource management
*
* @param event the event object
*
* @return the operation status, RT_EOK on successful
*/
rt_err_t rt_event_detach(rt_event_t event)
{
/* parameter check */
RT_ASSERT(event != RT_NULL);
/* resume all suspended thread */
rt_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
/**
* This function will create an event object from system resource
*
* @param name the name of event
* @param flag the flag of event
*
* @return the created event, RT_NULL on error happen
*/
rt_event_t rt_event_create(const char *name, rt_uint8_t flag)
{
rt_event_t event;
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;
/* init ipc object */
rt_ipc_object_init(&(event->parent));
/* init event */
event->set = 0;
return event;
}
RTM_EXPORT(rt_event_create);
/**
* This function will delete an event object and release the memory
*
* @param event the event object
*
* @return the error code
*/
rt_err_t rt_event_delete(rt_event_t event)
{
/* parameter check */
RT_ASSERT(event != RT_NULL);
RT_DEBUG_NOT_IN_INTERRUPT;
/* resume all suspended thread */
rt_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
/**
* This function will send an event to the event object, if there are threads
* suspended on event object, it will be waked up.
*
* @param event the event object
* @param set the event set
*
* @return the error code
*/
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);
if (set == 0)
return -RT_ERROR;
need_schedule = RT_FALSE;
RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(event->parent.parent)));
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* set event */
event->set |= set;
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 recieved event set */
thread->event_set = thread->event_set & event->set;
/* received an OR event */
status = RT_EOK;
}
}
/* 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);
/**
* This function will receive an event from event object, if the event is
* unavailable, the thread shall wait for a specified time.
*
* @param event the fast event object
* @param set the interested event set
* @param option the receive option, either RT_EVENT_FLAG_AND or
* RT_EVENT_FLAG_OR should be set.
* @param timeout the waiting time
* @param recved the received event, if you don't care, RT_NULL can be set.
*
* @return the error code
*/
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);
if (set == 0)
return -RT_ERROR;
/* init 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);
/* received event */
if (option & RT_EVENT_FLAG_CLEAR)
event->set &= ~set;
}
else if (timeout == 0)
{
/* no waiting */
thread->error = -RT_ETIMEOUT;
}
else
{
/* fill thread event info */
thread->event_set = set;
thread->event_info = option;
/* put thread to suspended thread list */
rt_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);
/**
* This function can get or set some extra attributions of an event object.
*
* @param event the event object
* @param cmd the execution command
* @param arg the execution argument
*
* @return the error code
*/
rt_err_t rt_event_control(rt_event_t event, int cmd, void *arg)
{
rt_ubase_t level;
RT_ASSERT(event != RT_NULL);
if (cmd == RT_IPC_CMD_RESET)
{
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* resume all waiting thread */
rt_ipc_list_resume_all(&event->parent.suspend_thread);
/* init 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 /* end of RT_USING_EVENT */
#ifdef RT_USING_MAILBOX
/**
* This function will initialize a mailbox and put it under control of resource
* management.
*
* @param mb the mailbox object
* @param name the name of mailbox
* @param msgpool the begin address of buffer to save received mail
* @param size the size of mailbox
* @param flag the flag of mailbox
*
* @return the operation status, RT_EOK on successful
*/
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);
/* init object */
rt_object_init(&(mb->parent.parent), RT_Object_Class_MailBox, name);
/* set parent flag */
mb->parent.parent.flag = flag;
/* init ipc object */
rt_ipc_object_init(&(mb->parent));
/* init mailbox */
mb->msg_pool = msgpool;
mb->size = size;
mb->entry = 0;
mb->in_offset = 0;
mb->out_offset = 0;
/* init an additional list of sender suspend thread */
rt_list_init(&(mb->suspend_sender_thread));
return RT_EOK;
}
RTM_EXPORT(rt_mb_init);
/**
* This function will detach a mailbox from resource management
*
* @param mb the mailbox object
*
* @return the operation status, RT_EOK on successful
*/
rt_err_t rt_mb_detach(rt_mailbox_t mb)
{
/* parameter check */
RT_ASSERT(mb != RT_NULL);
/* resume all suspended thread */
rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
/* also resume all mailbox private suspended thread */
rt_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
/**
* This function will create a mailbox object from system resource
*
* @param name the name of mailbox
* @param size the size of mailbox
* @param flag the flag of mailbox
*
* @return the created mailbox, RT_NULL on error happen
*/
rt_mailbox_t rt_mb_create(const char *name, rt_size_t size, rt_uint8_t flag)
{
rt_mailbox_t mb;
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;
/* init ipc object */
rt_ipc_object_init(&(mb->parent));
/* init mailbox */
mb->size = size;
mb->msg_pool = RT_KERNEL_MALLOC(mb->size * sizeof(rt_uint32_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;
/* init an additional list of sender suspend thread */
rt_list_init(&(mb->suspend_sender_thread));
return mb;
}
RTM_EXPORT(rt_mb_create);
/**
* This function will delete a mailbox object and release the memory
*
* @param mb the mailbox object
*
* @return the error code
*/
rt_err_t rt_mb_delete(rt_mailbox_t mb)
{
RT_DEBUG_NOT_IN_INTERRUPT;
/* parameter check */
RT_ASSERT(mb != RT_NULL);
/* resume all suspended thread */
rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
/* also resume all mailbox private suspended thread */
rt_ipc_list_resume_all(&(mb->suspend_sender_thread));
#if defined(RT_USING_MODULE) && defined(RT_USING_SLAB)
/* the mb object belongs to an application module */
if (mb->parent.parent.flag & RT_OBJECT_FLAG_MODULE)
rt_module_free(mb->parent.parent.module_id, mb->msg_pool);
else
#endif
/* 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
/**
* This function will send a mail to mailbox object. If the mailbox is full,
* current thread will be suspended until timeout.
*
* @param mb the mailbox object
* @param value the mail
* @param timeout the waiting time
*
* @return the error code
*/
rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
rt_uint32_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);
/* 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 */
rt_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;
/* increase message entry */
mb->entry ++;
/* resume suspended thread */
if (!rt_list_isempty(&mb->parent.suspend_thread))
{
rt_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);
/**
* This function will send a mail to mailbox object, if there are threads
* suspended on mailbox object, it will be waked up. This function will return
* immediately, if you want blocking send, use rt_mb_send_wait instead.
*
* @param mb the mailbox object
* @param value the mail
*
* @return the error code
*/
rt_err_t rt_mb_send(rt_mailbox_t mb, rt_uint32_t value)
{
return rt_mb_send_wait(mb, value, 0);
}
RTM_EXPORT(rt_mb_send);
/**
* 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.
*
* @param mb the mailbox object
* @param value the received mail will be saved in
* @param timeout the waiting time
*
* @return the error code
*/
rt_err_t rt_mb_recv(rt_mailbox_t mb, rt_uint32_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);
/* 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 */
rt_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 */
mb->entry --;
/* resume suspended thread */
if (!rt_list_isempty(&(mb->suspend_sender_thread)))
{
rt_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);
/**
* This function can get or set some extra attributions of a mailbox object.
*
* @param mb the mailbox object
* @param cmd the execution command
* @param arg the execution argument
*
* @return the error code
*/
rt_err_t rt_mb_control(rt_mailbox_t mb, int cmd, void *arg)
{
rt_ubase_t level;
RT_ASSERT(mb != RT_NULL);
if (cmd == RT_IPC_CMD_RESET)
{
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* resume all waiting thread */
rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
/* also resume all mailbox private suspended thread */
rt_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 /* end of RT_USING_MAILBOX */
#ifdef RT_USING_MESSAGEQUEUE
struct rt_mq_message
{
struct rt_mq_message *next;
};
/**
* This function will initialize a message queue and put it under control of
* resource management.
*
* @param mq the message object
* @param name the name of message queue
* @param msgpool the beginning address of buffer to save messages
* @param msg_size the maximum size of message
* @param pool_size the size of buffer to save messages
* @param flag the flag of message queue
*
* @return the operation status, RT_EOK on successful
*/
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);
/* init object */
rt_object_init(&(mq->parent.parent), RT_Object_Class_MessageQueue, name);
/* set parent flag */
mq->parent.parent.flag = flag;
/* init ipc object */
rt_ipc_object_init(&(mq->parent));
/* set messasge 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));
/* init message list */
mq->msg_queue_head = RT_NULL;
mq->msg_queue_tail = RT_NULL;
/* init 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 = mq->msg_queue_free;
mq->msg_queue_free = head;
}
/* the initial entry is zero */
mq->entry = 0;
return RT_EOK;
}
RTM_EXPORT(rt_mq_init);
/**
* This function will detach a message queue object from resource management
*
* @param mq the message queue object
*
* @return the operation status, RT_EOK on successful
*/
rt_err_t rt_mq_detach(rt_mq_t mq)
{
/* parameter check */
RT_ASSERT(mq != RT_NULL);
/* resume all suspended thread */
rt_ipc_list_resume_all(&mq->parent.suspend_thread);
/* detach message queue object */
rt_object_detach(&(mq->parent.parent));
return RT_EOK;
}
RTM_EXPORT(rt_mq_detach);
#ifdef RT_USING_HEAP
/**
* This function will create a message queue object from system resource
*
* @param name the name of message queue
* @param msg_size the size of message
* @param max_msgs the maximum number of message in queue
* @param flag the flag of message queue
*
* @return the created message queue, RT_NULL on error happen
*/
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_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;
/* init ipc object */
rt_ipc_object_init(&(mq->parent));
/* init 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_mq_delete(mq);
return RT_NULL;
}
/* init message list */
mq->msg_queue_head = RT_NULL;
mq->msg_queue_tail = RT_NULL;
/* init 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 = mq->msg_queue_free;
mq->msg_queue_free = head;
}
/* the initial entry is zero */
mq->entry = 0;
return mq;
}
RTM_EXPORT(rt_mq_create);
/**
* This function will delete a message queue object and release the memory
*
* @param mq the message queue object
*
* @return the error code
*/
rt_err_t rt_mq_delete(rt_mq_t mq)
{
RT_DEBUG_NOT_IN_INTERRUPT;
/* parameter check */
RT_ASSERT(mq != RT_NULL);
/* resume all suspended thread */
rt_ipc_list_resume_all(&(mq->parent.suspend_thread));
#if defined(RT_USING_MODULE) && defined(RT_USING_SLAB)
/* the mq object belongs to an application module */
if (mq->parent.parent.flag & RT_OBJECT_FLAG_MODULE)
rt_module_free(mq->parent.parent.module_id, mq->msg_pool);
else
#endif
/* 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
/**
* This function will send a message to message queue object, if there are
* threads suspended on message queue object, it will be waked up.
*
* @param mq the message queue object
* @param buffer the message
* @param size the size of buffer
*
* @return the error code
*/
rt_err_t rt_mq_send(rt_mq_t mq, void *buffer, rt_size_t size)
{
register rt_ubase_t temp;
struct rt_mq_message *msg;
RT_ASSERT(mq != RT_NULL);
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);
/* 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;
/* increase message entry */
mq->entry ++;
/* resume suspended thread */
if (!rt_list_isempty(&mq->parent.suspend_thread))
{
rt_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);
/**
* This function will send an urgent message to message queue object, which
* means the message will be inserted to the head of message queue. If there
* are threads suspended on message queue object, it will be waked up.
*
* @param mq the message queue object
* @param buffer the message
* @param size the size of buffer
*
* @return the error code
*/
rt_err_t rt_mq_urgent(rt_mq_t mq, void *buffer, rt_size_t size)
{
register rt_ubase_t temp;
struct rt_mq_message *msg;
RT_ASSERT(mq != RT_NULL);
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 = 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;
/* increase message entry */
mq->entry ++;
/* resume suspended thread */
if (!rt_list_isempty(&mq->parent.suspend_thread))
{
rt_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);
/**
* This function will receive a message from message queue object, if there is
* no message in message queue object, the thread shall wait for a specified
* time.
*
* @param mq the message queue object
* @param buffer the received message will be saved in
* @param size the size of buffer
* @param timeout the waiting time
*
* @return the error code
*/
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;
RT_ASSERT(mq != RT_NULL);
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 */
rt_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 */
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;
/* 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);
/**
* This function can get or set some extra attributions of a message queue
* object.
*
* @param mq the message queue object
* @param cmd the execution command
* @param arg the execution argument
*
* @return the error code
*/
rt_err_t rt_mq_control(rt_mq_t mq, int cmd, void *arg)
{
rt_ubase_t level;
struct rt_mq_message *msg;
RT_ASSERT(mq != RT_NULL);
if (cmd == RT_IPC_CMD_RESET)
{
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* resume all waiting thread */
rt_ipc_list_resume_all(&mq->parent.suspend_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 /* end of RT_USING_MESSAGEQUEUE */
/**@}*/
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