mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +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
47 lines
2.5 KiB
C
47 lines
2.5 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/calls/calls.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/runtime/syslib.internal.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
void sys_sched_yield(void);
|
|
|
|
/**
|
|
* Yields current thread's remaining timeslice to operating system.
|
|
*
|
|
* @return 0 on success, or error number on failure
|
|
*/
|
|
int pthread_yield_np(void) {
|
|
if (IsXnuSilicon()) {
|
|
__syslib->__pthread_yield_np();
|
|
} else if (IsOpenbsd()) {
|
|
// sched_yield() is punishingly slow on OpenBSD
|
|
// it's ruinously slow it'll destroy everything
|
|
pthread_pause_np();
|
|
} else {
|
|
sys_sched_yield();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
__weak_reference(pthread_yield_np, thrd_yield);
|
|
__weak_reference(pthread_yield_np, sched_yield);
|
|
__weak_reference(pthread_yield_np, pthread_yield);
|