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Implement POSIX threads API

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Justine Tunney 2022-09-05 08:26:03 -07:00
parent af24f21556
commit 9be364d40a
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95 changed files with 6029 additions and 317 deletions
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libc/thread/pthread_create.c Normal file
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/*-*- 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 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/intrin/pthread.h"
#include "libc/mem/mem.h"
#include "libc/nexgen32e/gettls.h"
#include "libc/runtime/runtime.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
static int PosixThread(void *arg, int tid) {
struct PosixThread *pt = arg;
enum PosixThreadStatus status;
pt->tid = tid;
if (!setjmp(pt->exiter)) {
((cthread_t)__get_tls())->pthread = pt;
pt->rc = pt->start_routine(pt->arg);
}
if (atomic_load_explicit(&pt->status, memory_order_relaxed) ==
kPosixThreadDetached) {
atomic_store_explicit(&pt->status, kPosixThreadZombie,
memory_order_relaxed);
} else {
atomic_store_explicit(&pt->status, kPosixThreadTerminated,
memory_order_relaxed);
}
return 0;
}
/**
* Creates thread.
*
* @return 0 on success, or errno on error
*/
int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
void *(*start_routine)(void *), void *arg) {
int e, rc;
struct PosixThread *pt;
e = errno;
pthread_zombies_decimate();
if ((pt = calloc(1, sizeof(struct PosixThread)))) {
pt->start_routine = start_routine;
pt->arg = arg;
if (!_spawn(PosixThread, pt, &pt->spawn)) {
*thread = pt;
rc = 0;
} else {
free(pt);
rc = errno;
}
} else {
rc = errno;
}
errno = e;
return rc;
}