mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
425ff5dff0
- Write tests for cthreads - Fix bugs in pe2.com tool - Fix ASAN issue with GetDosEnviron() - Consolidate the cthread header files - Some code size optimizations for MODE= - Attempted to squash a tls linker warning - Attempted to get futexes working on FreeBSD
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 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/bits/atomic.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/lockcmpxchg.h"
|
|
#include "libc/intrin/spinlock.h"
|
|
#include "libc/runtime/runtime.h"
|
|
|
|
typedef void *pthread_t;
|
|
typedef int pthread_once_t;
|
|
typedef int pthread_mutex_t;
|
|
|
|
int pthread_once(pthread_once_t *once, void init(void)) {
|
|
int x;
|
|
unsigned tries;
|
|
switch ((x = atomic_load(once))) {
|
|
case 0:
|
|
if (atomic_compare_exchange_strong(once, &x, 1)) {
|
|
init();
|
|
atomic_store(once, 2);
|
|
break;
|
|
}
|
|
// fallthrough
|
|
case 1:
|
|
tries = 0;
|
|
do {
|
|
if (++tries & 7) {
|
|
__builtin_ia32_pause();
|
|
} else {
|
|
sched_yield();
|
|
}
|
|
} while (atomic_load(once) == 1);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int pthread_mutex_lock(pthread_mutex_t *mutex) {
|
|
_spinlock(mutex);
|
|
return 0;
|
|
}
|
|
|
|
int pthread_mutex_trylock(pthread_mutex_t *mutex) {
|
|
return _trylock(mutex);
|
|
}
|
|
|
|
int pthread_mutex_unlock(pthread_mutex_t *mutex) {
|
|
_spunlock(mutex);
|
|
return 0;
|
|
}
|
|
|
|
int pthread_cancel(pthread_t thread) {
|
|
return ESRCH;
|
|
}
|
|
|
|
void *__tls_get_addr(size_t v[2]) {
|
|
return NULL;
|
|
}
|