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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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6
libc/thread/pthread_barrier_wait.c
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@ -17,11 +17,11 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/blockcancel.internal.h"
#include "libc/cosmo.h"
#include "libc/errno.h"
#include "libc/intrin/atomic.h"
#include "libc/limits.h"
#include "libc/thread/thread.h"
#include "third_party/nsync/futex.internal.h"
/**
* Waits for all threads to arrive at barrier.
@ -54,14 +54,14 @@ errno_t pthread_barrier_wait(pthread_barrier_t *barrier) {
atomic_store_explicit(&barrier->_counter, barrier->_count,
memory_order_release);
atomic_store_explicit(&barrier->_waiters, 0, memory_order_release);
nsync_futex_wake_(&barrier->_waiters, INT_MAX, barrier->_pshared);
cosmo_futex_wake(&barrier->_waiters, INT_MAX, barrier->_pshared);
return PTHREAD_BARRIER_SERIAL_THREAD;
}
// wait for everyone else to arrive at barrier
BLOCK_CANCELATION;
while ((n = atomic_load_explicit(&barrier->_waiters, memory_order_acquire)))
nsync_futex_wait_(&barrier->_waiters, n, barrier->_pshared, 0, 0);
cosmo_futex_wait(&barrier->_waiters, n, barrier->_pshared, 0, 0);
ALLOW_CANCELATION;
return 0;