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Merge pull request #11992 from JulianHolzwarth/pr/xtimer_mutex_lock_timeout/first_fix

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sys/xtimer/xtimer.c: _mutex_timeout() bug fix for race condition
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MichelRottleuthner 2019-12-04 10:43:20 +01:00 committed by GitHub
commit 272079c89e
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1 changed files with 14 additions and 11 deletions
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25
sys/xtimer/xtimer.c
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@ -252,19 +252,22 @@ static void _mutex_timeout(void *arg)
mutex_thread_t *mt = (mutex_thread_t *)arg;
mt->timeout = 1;
list_node_t *node = list_remove(&mt->mutex->queue,
(list_node_t *)&mt->thread->rq_entry);
if (mt->mutex->queue.next != MUTEX_LOCKED &&
mt->mutex->queue.next != NULL) {
mt->timeout = 1;
list_node_t *node = list_remove(&mt->mutex->queue,
(list_node_t *)&mt->thread->rq_entry);
/* if thread was removed from the list */
if (node != NULL) {
if (mt->mutex->queue.next == NULL) {
mt->mutex->queue.next = MUTEX_LOCKED;
/* if thread was removed from the list */
if (node != NULL) {
if (mt->mutex->queue.next == NULL) {
mt->mutex->queue.next = MUTEX_LOCKED;
}
sched_set_status(mt->thread, STATUS_PENDING);
irq_restore(irqstate);
sched_switch(mt->thread->priority);
return;
}
sched_set_status(mt->thread, STATUS_PENDING);
irq_restore(irqstate);
sched_switch(mt->thread->priority);
return;
}
irq_restore(irqstate);
}