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Add posix semaphores support

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There's still some bugs to work out on Windows and OpenBSD.
This commit is contained in:
Justine Tunney 2022-10-14 08:25:47 -07:00
parent f52f65b2e3
commit 8111462789
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GPG key ID: BE714B4575D6E328
36 changed files with 779 additions and 59 deletions
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8
third_party/nsync/mu_semaphore.c vendored
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@ -57,9 +57,10 @@ void nsync_mu_semaphore_p (nsync_semaphore *s) {
do {
i = ATM_LOAD ((nsync_atomic_uint32_ *) &f->i);
if (i == 0) {
int futex_result = nsync_futex_wait_ (&f->i, i, PTHREAD_PROCESS_PRIVATE, NULL);
int futex_result = nsync_futex_wait_ ((atomic_int *)&f->i, i, PTHREAD_PROCESS_PRIVATE, NULL);
ASSERT (futex_result == 0 ||
futex_result == -EINTR ||
futex_result == -EAGAIN ||
futex_result == -EWOULDBLOCK);
}
} while (i == 0 || !ATM_CAS_ACQ ((nsync_atomic_uint32_ *) &f->i, i, i-1));
@ -98,9 +99,10 @@ int nsync_mu_semaphore_p_with_deadline (nsync_semaphore *s, nsync_time abs_deadl
}
ts = &ts_buf;
}
futex_result = nsync_futex_wait_ (&f->i, i, PTHREAD_PROCESS_PRIVATE, ts);
futex_result = nsync_futex_wait_ ((atomic_int *)&f->i, i, PTHREAD_PROCESS_PRIVATE, ts);
ASSERT (futex_result == 0 ||
futex_result == -EINTR ||
futex_result == -EAGAIN ||
futex_result == -ETIMEDOUT ||
futex_result == -EWOULDBLOCK);
/* Some systems don't wait as long as they are told. */
@ -120,5 +122,5 @@ void nsync_mu_semaphore_v (nsync_semaphore *s) {
do {
old_value = ATM_LOAD ((nsync_atomic_uint32_ *) &f->i);
} while (!ATM_CAS_REL ((nsync_atomic_uint32_ *) &f->i, old_value, old_value+1));
ASSERT (nsync_futex_wake_ (&f->i, 1, PTHREAD_PROCESS_PRIVATE) >= 0);
ASSERT (nsync_futex_wake_ ((atomic_int *)&f->i, 1, PTHREAD_PROCESS_PRIVATE) >= 0);
}