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Introduce cosmo_futex_wait and cosmo_futex_wake

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Cosmopolitan Futexes are now exposed as a public API.
This commit is contained in:
Justine Tunney 2024-11-22 11:08:29 -08:00
parent 729f7045e3
commit 9ddbfd921e
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GPG key ID: BE714B4575D6E328
66 changed files with 886 additions and 917 deletions
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16
libc/intrin/pthread_mutex_trylock.c
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@ -24,15 +24,8 @@
#include "libc/runtime/internal.h"
#include "libc/thread/lock.h"
#include "libc/thread/thread.h"
#include "third_party/nsync/futex.internal.h"
#include "third_party/nsync/mu.h"
static errno_t pthread_mutex_trylock_spin(atomic_int *word) {
if (!atomic_exchange_explicit(word, 1, memory_order_acquire))
return 0;
return EBUSY;
}
static errno_t pthread_mutex_trylock_drepper(atomic_int *futex) {
int word = 0;
if (atomic_compare_exchange_strong_explicit(
@ -142,13 +135,8 @@ errno_t pthread_mutex_trylock(pthread_mutex_t *mutex) {
#endif
// handle normal mutexes
if (MUTEX_TYPE(word) == PTHREAD_MUTEX_NORMAL) {
if (_weaken(nsync_futex_wait_)) {
return pthread_mutex_trylock_drepper(&mutex->_futex);
} else {
return pthread_mutex_trylock_spin(&mutex->_futex);
}
}
if (MUTEX_TYPE(word) == PTHREAD_MUTEX_NORMAL)
return pthread_mutex_trylock_drepper(&mutex->_futex);
// handle recursive and error checking mutexes
#if PTHREAD_USE_NSYNC