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sched/semaphore: add sem_count temporary variable to improve performance

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zhangyuan21 2022-08-31 15:23:45 +08:00 committed by Xiang Xiao
parent 71af0b5295
commit eb22ee0e21
1 changed files with 7 additions and 3 deletions
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10
sched/semaphore/sem_post.c
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@ -71,6 +71,7 @@ int nxsem_post(FAR sem_t *sem)
{ {
FAR struct tcb_s *stcb = NULL; FAR struct tcb_s *stcb = NULL;
irqstate_t flags; irqstate_t flags;
int16_t sem_count;
int ret = -EINVAL; int ret = -EINVAL;
/* Make sure we were supplied with a valid semaphore. */ /* Make sure we were supplied with a valid semaphore. */
@ -84,9 +85,11 @@ int nxsem_post(FAR sem_t *sem)
flags = enter_critical_section(); flags = enter_critical_section();
sem_count = sem->semcount;
/* Check the maximum allowable value */ /* Check the maximum allowable value */
if (sem->semcount >= SEM_VALUE_MAX) if (sem_count >= SEM_VALUE_MAX)
{ {
leave_critical_section(flags); leave_critical_section(flags);
return -EOVERFLOW; return -EOVERFLOW;
@ -110,7 +113,8 @@ int nxsem_post(FAR sem_t *sem)
*/ */
nxsem_release_holder(sem); nxsem_release_holder(sem);
sem->semcount++; sem_count++;
sem->semcount = sem_count;
#ifdef CONFIG_PRIORITY_INHERITANCE #ifdef CONFIG_PRIORITY_INHERITANCE
/* Don't let any unblocked tasks run until we complete any priority /* Don't let any unblocked tasks run until we complete any priority
@ -127,7 +131,7 @@ int nxsem_post(FAR sem_t *sem)
* there must be some task waiting for the semaphore. * there must be some task waiting for the semaphore.
*/ */
if (sem->semcount <= 0) if (sem_count <= 0)
{ {
/* Check if there are any tasks in the waiting for semaphore /* Check if there are any tasks in the waiting for semaphore
* task list that are waiting for this semaphore. This is a * task list that are waiting for this semaphore. This is a