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Make some fixups to POSIX threads

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Justine Tunney 2022-09-07 21:13:50 -07:00
parent de511bc71a
commit 6c323383e5
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GPG key ID: BE714B4575D6E328
12 changed files with 168 additions and 69 deletions
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23
libc/thread/pthread_detach.c
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@ -34,17 +34,24 @@ int pthread_detach(pthread_t thread) {
for (;;) {
status = atomic_load_explicit(&pt->status, memory_order_relaxed);
if (status == kPosixThreadDetached || status == kPosixThreadZombie) {
// these two states indicate the thread was already detached, in
// which case it's already listed under _pthread_zombies.
break;
} else if (status == kPosixThreadTerminated) {
pthread_wait(pt);
pthread_free(pt);
break;
} else if (status == kPosixThreadJoinable &&
atomic_compare_exchange_weak_explicit(
&pt->status, &status, kPosixThreadDetached,
memory_order_acquire, memory_order_relaxed)) {
pthread_zombies_add(pt);
// thread was joinable and finished running. since pthread_join
// won't be called, it's safe to free the thread resources now.
_pthread_wait(pt);
_pthread_free(pt);
break;
} else if (status == kPosixThreadJoinable) {
if (atomic_compare_exchange_weak_explicit(
&pt->status, &status, kPosixThreadDetached, memory_order_acquire,
memory_order_relaxed)) {
_pthread_zombies_add(pt);
break;
}
} else {
notpossible;
}
}
return 0;