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https://github.com/jart/cosmopolitan.git
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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
58 lines
3.1 KiB
C
58 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/atomic.h"
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#include "libc/thread/thread.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/spawn.h"
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/**
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* Asks POSIX thread to free itself automatically on termination.
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*
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* @return 0 on success, or errno with error
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*/
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int pthread_detach(pthread_t thread) {
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enum PosixThreadStatus status;
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struct PosixThread *pt = (struct PosixThread *)thread;
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for (;;) {
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status = atomic_load_explicit(&pt->status, memory_order_relaxed);
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if (status == kPosixThreadDetached || status == kPosixThreadZombie) {
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// these two states indicate the thread was already detached, in
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// which case it's already listed under _pthread_zombies.
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break;
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} else if (status == kPosixThreadTerminated) {
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// thread was joinable and finished running. since pthread_join
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// won't be called, it's safe to free the thread resources now.
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_pthread_wait(pt);
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_pthread_free(pt);
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break;
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} else if (status == kPosixThreadJoinable) {
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if (atomic_compare_exchange_weak_explicit(
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&pt->status, &status, kPosixThreadDetached, memory_order_acquire,
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memory_order_relaxed)) {
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_pthread_zombies_add(pt);
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break;
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}
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} else {
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notpossible;
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}
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}
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return 0;
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}
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