mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
e398f3887c
- NetBSD should now have faster synchronization - POSIX barriers may now be shared across processes - An edge case with memory map tracking has been fixed - Grand Central Dispatch is no longer used on MacOS ARM64 - POSIX mutexes in normal mode now use futexes across processes
45 lines
2.7 KiB
C
45 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/limits.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
/**
|
|
* Initializes barrier.
|
|
*
|
|
* @param attr may be null
|
|
* @param count is how many threads need to call pthread_barrier_wait()
|
|
* before the barrier is released, which must be greater than zero
|
|
* @return 0 on success, or error number on failure
|
|
* @raise EINVAL if `count` isn't greater than zero
|
|
*/
|
|
errno_t pthread_barrier_init(pthread_barrier_t *barrier,
|
|
const pthread_barrierattr_t *attr,
|
|
unsigned count) {
|
|
if (!count)
|
|
return EINVAL;
|
|
if (count > INT_MAX)
|
|
return EINVAL;
|
|
barrier->_count = count;
|
|
barrier->_pshared = attr ? *attr : PTHREAD_PROCESS_PRIVATE;
|
|
atomic_store_explicit(&barrier->_counter, count, memory_order_relaxed);
|
|
atomic_store_explicit(&barrier->_waiters, 0, memory_order_relaxed);
|
|
return 0;
|
|
}
|