zhaoxiu-zeng commented on a change in pull request #5171:
URL: https://github.com/apache/incubator-nuttx/pull/5171#discussion_r779457573
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File path: sched/semaphore/sem_holder.c
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@@ -1035,17 +1011,52 @@ void nxsem_release_holder(FAR sem_t *sem)
{
FAR struct tcb_s *rtcb = this_task();
FAR struct semholder_s *pholder;
+ FAR struct semholder_s *candidate = NULL;
+ unsigned int total = 0;
/* Find the container for this holder */
- pholder = nxsem_findholder(sem, rtcb);
- if (pholder != NULL && pholder->counts > 0)
+#if CONFIG_SEM_PREALLOCHOLDERS > 0
+ for (pholder = sem->hhead; pholder; pholder = pholder->flink)
+ {
+#else
+ int i;
+
+ /* We have two hard-allocated holder structures in sem_t */
+
+ for (i = 0; i < 2; i++)
+ {
+ pholder = &sem->holder[i];
+#endif
+
+ if (pholder->counts <= 0)
+ continue;
+
+ if (pholder->htcb == rtcb)
+ {
+ /* Decrement the counts on this holder -- the holder will be freed
+ * later in nxsem_restore_baseprio.
+ */
+
+ pholder->counts--;
+ return;
+ }
+
+ total++;
+ if (candidate == NULL)
+ candidate = pholder;
+ }
+
+ /* The current task is not a holder */
+
+ if (total == 1)
Review comment:
Yes, the sum of holder's counts must <= SEM_VALUE_MAX, but there may be
multi holders. If the caller of sem_post is not a holder, how we choose the
holder to decremnt it's counts?
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