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Harden against aba problem

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Justine Tunney 2024-08-26 19:59:25 -07:00
parent 610c951f71
commit 884d89235f
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GPG key ID: BE714B4575D6E328
8 changed files with 212 additions and 85 deletions
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6
third_party/nsync/mu_semaphore_sem.c vendored
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@ -52,11 +52,11 @@ static nsync_semaphore *sem_big_enough_for_sem = (nsync_semaphore *) (uintptr_t)
(sizeof (struct sem) <= sizeof (*sem_big_enough_for_sem)));
static void sems_push (struct sem *f) {
int backoff = 0;
f->next = atomic_load_explicit (&g_sems, memory_order_relaxed);
while (!atomic_compare_exchange_weak_explicit (&g_sems, &f->next, f,
memory_order_acq_rel, memory_order_relaxed))
backoff = pthread_delay_np (&g_sems, backoff);
memory_order_acq_rel,
memory_order_relaxed))
pthread_pause_np ();
}
static bool nsync_mu_semaphore_sem_create (struct sem *f) {