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[Kernel] Add nested mutex feature

This commit is contained in:
Bernard Xiong 2022-10-15 16:19:13 +08:00
parent 8524e273e1
commit 34c77da153
5 changed files with 291 additions and 82 deletions
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9
components/finsh/cmd.c
View File

@ -411,9 +411,9 @@ long list_mutex(void)
maxlen = RT_NAME_MAX;
rt_kprintf("%-*.s owner hold suspend thread\n", maxlen, item_title);
rt_kprintf("%-*.s owner hold suspend thread priority\n", maxlen, item_title);
object_split(maxlen);
rt_kprintf(" -------- ---- --------------\n");
rt_kprintf(" -------- ---- -------------- --------\n");
do
{
@ -436,13 +436,14 @@ long list_mutex(void)
rt_hw_interrupt_enable(level);
m = (struct rt_mutex *)obj;
rt_kprintf("%-*.*s %-8.*s %04d %d\n",
rt_kprintf("%-*.*s %-8.*s %04d %d %d\n",
maxlen, RT_NAME_MAX,
m->parent.parent.name,
RT_NAME_MAX,
m->owner->name,
m->hold,
rt_list_len(&m->parent.suspend_thread));
rt_list_len(&m->parent.suspend_thread),
m->priority);
}
}

12
include/rtdef.h
View File

@ -665,12 +665,19 @@ struct rt_thread
/* priority */
rt_uint8_t current_priority; /**< current priority */
rt_uint8_t init_priority; /**< initialized priority */
#if RT_THREAD_PRIORITY_MAX > 32
rt_uint8_t number;
rt_uint8_t high_mask;
#endif /* RT_THREAD_PRIORITY_MAX > 32 */
rt_uint32_t number_mask;
#ifdef RT_USING_MUTEX
/* object for IPC */
rt_list_t taken_object_list;
rt_object_t pending_object;
#endif
#ifdef RT_USING_EVENT
/* thread event */
rt_uint32_t event_set;
@ -764,12 +771,11 @@ struct rt_mutex
{
struct rt_ipc_object parent; /**< inherit from ipc_object */
rt_uint16_t value; /**< value of mutex */
rt_uint8_t original_priority; /**< priority of last thread hold the mutex */
rt_uint8_t priority; /**< the maximal priority for pending thread */
rt_uint8_t hold; /**< numbers of thread hold the mutex */
struct rt_thread *owner; /**< current owner of mutex */
rt_list_t taken_list; /**< the object list taken by thread */
};
typedef struct rt_mutex *rt_mutex_t;
#endif /* RT_USING_MUTEX */

1
include/rtthread.h
View File

@ -368,6 +368,7 @@ rt_err_t rt_mutex_detach(rt_mutex_t mutex);
rt_mutex_t rt_mutex_create(const char *name, rt_uint8_t flag);
rt_err_t rt_mutex_delete(rt_mutex_t mutex);
#endif
void rt_mutex_drop_thread(rt_mutex_t mutex, rt_thread_t thread);
rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t timeout);
rt_err_t rt_mutex_trytake(rt_mutex_t mutex);

324
src/ipc.c
View File

@ -42,6 +42,7 @@
* 2022-01-07 Gabriel Moving __on_rt_xxxxx_hook to ipc.c
* 2022-01-24 THEWON let rt_mutex_take return thread->error when using signal
* 2022-04-08 Stanley Correct descriptions
* 2022-10-15 Bernard add nested mutex feature
*/
#include <rtthread.h>
@ -708,6 +709,80 @@ RTM_EXPORT(rt_sem_control);
#endif /* RT_USING_SEMAPHORE */
#ifdef RT_USING_MUTEX
rt_inline rt_uint8_t _mutex_update_priority(struct rt_mutex *mutex)
{
struct rt_thread *thread;
if (!rt_list_isempty(&mutex->parent.suspend_thread))
{
thread = rt_list_entry(mutex->parent.suspend_thread.next, struct rt_thread, tlist);
mutex->priority = thread->current_priority;
}
else
{
mutex->priority = 0xff;
}
return mutex->priority;
}
rt_inline rt_uint8_t _thread_get_mutex_priority(struct rt_thread* thread)
{
struct rt_mutex *mutex;
rt_uint8_t priority = thread->init_priority;
rt_list_for_each_entry(mutex, &(thread->taken_object_list), taken_list)
{
if (priority > mutex->priority) priority = mutex->priority;
}
return priority;
}
rt_inline void _thread_update_priority(struct rt_thread *thread, rt_uint8_t priority)
{
RT_DEBUG_LOG(RT_DEBUG_IPC,
("thread:%s priority -> %d\n", thread->name, priority));
/* change priority of the thread */
rt_thread_control(thread,
RT_THREAD_CTRL_CHANGE_PRIORITY,
&priority);
if ((thread->stat & RT_THREAD_STAT_MASK) == RT_THREAD_SUSPEND)
{
/* whether change the priority of taken mutex */
struct rt_object* pending_obj = thread->pending_object;
if (pending_obj && rt_object_get_type(pending_obj) == RT_Object_Class_Mutex)
{
rt_uint8_t mutex_priority;
struct rt_mutex* pending_mutex = (struct rt_mutex *)pending_obj;
/* re-insert thread to suspended thread list */
rt_list_remove(&(thread->tlist));
_ipc_list_suspend(&(pending_mutex->parent.suspend_thread),
thread,
pending_mutex->parent.parent.flag);
/* update priority */
_mutex_update_priority(pending_mutex);
/* change the priority of mutex owner thread */
RT_DEBUG_LOG(RT_DEBUG_IPC,
("mutex: %s priority -> %d\n", pending_mutex->parent.parent.name,
pending_mutex->priority));
mutex_priority = _thread_get_mutex_priority(pending_mutex->owner);
if (mutex_priority != pending_mutex->owner->current_priority)
{
_thread_update_priority(pending_mutex->owner, mutex_priority);
}
}
}
return ;
}
/**
* @addtogroup mutex
*/
@ -752,10 +827,10 @@ rt_err_t rt_mutex_init(rt_mutex_t mutex, const char *name, rt_uint8_t flag)
/* initialize ipc object */
_ipc_object_init(&(mutex->parent));
mutex->value = 1;
mutex->owner = RT_NULL;
mutex->original_priority = 0xFF;
mutex->hold = 0;
mutex->owner = RT_NULL;
mutex->priority = 0xFF;
mutex->hold = 0;
rt_list_init(&(mutex->taken_list));
/* 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;
@ -785,13 +860,19 @@ RTM_EXPORT(rt_mutex_init);
*/
rt_err_t rt_mutex_detach(rt_mutex_t mutex)
{
rt_ubase_t level;
/* 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));
level = rt_hw_interrupt_disable();
/* wakeup all suspended threads */
_ipc_list_resume_all(&(mutex->parent.suspend_thread));
/* remove mutex from thread's taken list */
rt_list_remove(&mutex->taken_list);
rt_hw_interrupt_enable(level);
/* detach mutex object */
rt_object_detach(&(mutex->parent.parent));
@ -800,6 +881,48 @@ rt_err_t rt_mutex_detach(rt_mutex_t mutex)
}
RTM_EXPORT(rt_mutex_detach);
/* drop a thread from the suspend list of mutex */
void rt_mutex_drop_thread(rt_mutex_t mutex, rt_thread_t thread)
{
rt_uint8_t priority;
rt_bool_t need_update = RT_FALSE;
rt_list_remove(&(thread->tlist));
/* should change the priority of mutex owner thread */
if (mutex->owner->current_priority == thread->current_priority)
need_update = RT_TRUE;
/* update the priority of mutex */
if (!rt_list_isempty(&mutex->parent.suspend_thread))
{
/* more thread suspended in the list */
struct rt_thread *th;
th = rt_list_entry(mutex->parent.suspend_thread.next,
struct rt_thread,
tlist);
/* update the priority of mutex */
mutex->priority = th->current_priority;
}
else
{
/* set mutex priority to maximal priority */
mutex->priority = 0xff;
}
/* try to change the priority of mutex owner thread */
if (need_update)
{
/* get the maximal priority of mutex in thread */
priority = _thread_get_mutex_priority(mutex->owner);
if (priority != mutex->owner->current_priority)
{
_thread_update_priority(mutex->owner, priority);
}
}
}
#ifdef RT_USING_HEAP
/**
* @brief This function will create a mutex object.
@ -836,10 +959,10 @@ rt_mutex_t rt_mutex_create(const char *name, rt_uint8_t flag)
/* initialize ipc object */
_ipc_object_init(&(mutex->parent));
mutex->value = 1;
mutex->owner = RT_NULL;
mutex->original_priority = 0xFF;
mutex->hold = 0;
mutex->owner = RT_NULL;
mutex->priority = 0xFF;
mutex->hold = 0;
rt_list_init(&(mutex->taken_list));
/* 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;
@ -869,6 +992,8 @@ RTM_EXPORT(rt_mutex_create);
*/
rt_err_t rt_mutex_delete(rt_mutex_t mutex)
{
rt_ubase_t level;
/* parameter check */
RT_ASSERT(mutex != RT_NULL);
RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);
@ -876,8 +1001,12 @@ rt_err_t rt_mutex_delete(rt_mutex_t mutex)
RT_DEBUG_NOT_IN_INTERRUPT;
level = rt_hw_interrupt_disable();
/* wakeup all suspended threads */
_ipc_list_resume_all(&(mutex->parent.suspend_thread));
/* remove mutex from thread's taken list */
rt_list_remove(&mutex->taken_list);
rt_hw_interrupt_enable(level);
/* delete mutex object */
rt_object_delete(&(mutex->parent.parent));
@ -933,8 +1062,8 @@ rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t timeout)
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));
("mutex_take: current thread %s, hold: %d\n",
thread->name, mutex->hold));
/* reset thread error */
thread->error = RT_EOK;
@ -954,26 +1083,15 @@ rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t timeout)
}
else
{
/* 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)
/* whether the mutex has owner thread. */
if (mutex->owner == RT_NULL)
{
/* 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(level); /* enable interrupt */
return -RT_EFULL; /* value overflowed */
}
mutex->owner = thread;
mutex->priority = 0xff;
mutex->hold = 1;
/* insert mutex to thread's taken object list */
rt_list_insert_after(&thread->taken_object_list, &mutex->taken_list);
}
else
{
@ -990,23 +1108,28 @@ rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t timeout)
}
else
{
rt_uint8_t priority = thread->current_priority;
/* 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);
/* set pending object in thread to this mutex */
thread->pending_object = &(mutex->parent.parent);
/* update the priority level of mutex */
if (priority < mutex->priority)
{
mutex->priority = priority;
if (mutex->priority < mutex->owner->current_priority)
{
_thread_update_priority(mutex->owner, priority);
}
}
/* has waiting time, start thread timer */
if (timeout > 0)
@ -1028,16 +1151,57 @@ rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t timeout)
/* do schedule */
rt_schedule();
if (thread->error != RT_EOK)
/* disable interrupt */
level = rt_hw_interrupt_disable();
if (thread->error == RT_EOK)
{
/* return error */
return thread->error;
/* get mutex successfully */
}
else
{
/* the mutex is taken successfully. */
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* the mutex has not been taken and thread has detach from the pending list. */
rt_bool_t need_update = RT_FALSE;
/* should change the priority of mutex owner thread */
if (mutex->owner->current_priority == thread->current_priority)
need_update = RT_TRUE;
/* update the priority of mutex */
if (!rt_list_isempty(&mutex->parent.suspend_thread))
{
/* more thread suspended in the list */
struct rt_thread *th;
th = rt_list_entry(mutex->parent.suspend_thread.next,
struct rt_thread,
tlist);
/* update the priority of mutex */
mutex->priority = th->current_priority;
}
else
{
/* set mutex priority to maximal priority */
mutex->priority = 0xff;
}
/* try to change the priority of mutex owner thread */
if (need_update)
{
/* get the maximal priority of mutex in thread */
priority = _thread_get_mutex_priority(mutex->owner);
if (priority != mutex->owner->current_priority)
{
_thread_update_priority(mutex->owner, priority);
}
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
/* return error */
return thread->error;
}
}
}
@ -1109,8 +1273,8 @@ rt_err_t rt_mutex_release(rt_mutex_t mutex)
level = 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));
("mutex_release:current thread %s, hold: %d\n",
thread->name, mutex->hold));
RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mutex->parent.parent)));
@ -1130,60 +1294,70 @@ rt_err_t rt_mutex_release(rt_mutex_t mutex)
/* if no hold */
if (mutex->hold == 0)
{
/* change the owner thread to original priority */
if (mutex->original_priority != mutex->owner->current_priority)
/* remove mutex from thread's taken list */
rt_list_remove(&mutex->taken_list);
/* whether change the thread priority */
if (thread->current_priority == mutex->priority)
{
rt_thread_control(mutex->owner,
rt_uint8_t priority = 0xff;
/* get the highest priority in the taken list of thread */
priority = _thread_get_mutex_priority(thread);
rt_thread_control(thread,
RT_THREAD_CTRL_CHANGE_PRIORITY,
&(mutex->original_priority));
&priority);
need_schedule = RT_TRUE;
}
/* wakeup suspended thread */
if (!rt_list_isempty(&mutex->parent.suspend_thread))
{
/* get suspended thread */
thread = rt_list_entry(mutex->parent.suspend_thread.next,
/* get the first suspended thread */
struct rt_thread *next_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));
next_thread->name));
/* set new owner and priority */
mutex->owner = thread;
mutex->original_priority = thread->current_priority;
/* remove the thread from the suspended list of mutex */
rt_list_remove(&(next_thread->tlist));
if(mutex->hold < RT_MUTEX_HOLD_MAX)
/* set new owner and put mutex into taken list of thread */
mutex->owner = next_thread;
mutex->hold = 1;
rt_list_insert_after(&next_thread->taken_object_list, &mutex->taken_list);
/* cleanup pending object */
next_thread->pending_object = RT_NULL;
/* resume thread */
rt_thread_resume(next_thread);
/* update mutex priority */
if (!rt_list_isempty(&(mutex->parent.suspend_thread)))
{
mutex->hold ++;
struct rt_thread *th;
th = rt_list_entry(mutex->parent.suspend_thread.next,
struct rt_thread,
tlist);
mutex->priority = th->current_priority;
}
else
{
rt_hw_interrupt_enable(level); /* enable interrupt */
return -RT_EFULL; /* value overflowed */
mutex->priority = 0xff;
}
/* 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(level); /* enable interrupt */
return -RT_EFULL; /* value overflowed */
}
/* clear owner */
mutex->owner = RT_NULL;
mutex->original_priority = 0xff;
mutex->owner = RT_NULL;
mutex->priority = 0xff;
}
}

27
src/thread.c
View File

@ -31,6 +31,7 @@
* 2021-12-27 Meco Man remove .init_priority
* 2022-01-07 Gabriel Moving __on_rt_xxxxx_hook to thread.c
* 2022-01-24 THEWON let rt_thread_sleep return thread->error when using signal
* 2022-10-15 Bernard add nested mutex feature
*/
#include <rthw.h>
@ -187,10 +188,16 @@ static rt_err_t _thread_init(struct rt_thread *thread,
/* priority init */
RT_ASSERT(priority < RT_THREAD_PRIORITY_MAX);
thread->init_priority = priority;
thread->current_priority = priority;
thread->number_mask = 0;
#ifdef RT_USING_MUTEX
rt_list_init(&thread->taken_object_list);
thread->pending_object = RT_NULL;
#endif
#ifdef RT_USING_EVENT
thread->event_set = 0;
thread->event_info = 0;
@ -420,6 +427,16 @@ rt_err_t rt_thread_detach(rt_thread_t thread)
/* change stat */
thread->stat = RT_THREAD_CLOSE;
#ifdef RT_USING_MUTEX
if ((thread->pending_object) &&
(rt_object_get_type(thread->pending_object) == RT_Object_Class_Mutex))
{
struct rt_mutex *mutex = (struct rt_mutex*)thread->pending_object;
rt_mutex_drop_thread(mutex, thread);
thread->pending_object = RT_NULL;
}
#endif
/* insert to defunct thread list */
rt_thread_defunct_enqueue(thread);
@ -523,6 +540,16 @@ rt_err_t rt_thread_delete(rt_thread_t thread)
/* change stat */
thread->stat = RT_THREAD_CLOSE;
#ifdef RT_USING_MUTEX
if ((thread->pending_object) &&
(rt_object_get_type(thread->pending_object) == RT_Object_Class_Mutex))
{
struct rt_mutex *mutex = (struct rt_mutex*)thread->pending_object;
rt_mutex_drop_thread(mutex, thread);
thread->pending_object = RT_NULL;
}
#endif
/* insert to defunct thread list */
rt_thread_defunct_enqueue(thread);