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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
77 lines
3.4 KiB
C
77 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/weaken.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/thread.h"
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/**
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* Registers fork() handlers.
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*
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* Parent and child functions are called in the same order they're
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* registered. Prepare functions are called in reverse order.
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*
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* Here's an example of how pthread_atfork() can be used:
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*
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* static struct {
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* pthread_once_t once;
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* pthread_mutex_t lock;
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* // data structures...
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* } g_lib;
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*
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* static void lib_wipe(void) {
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* pthread_mutex_init(&g_lib.lock, 0);
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* }
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*
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* static void lib_lock(void) {
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* pthread_mutex_lock(&g_lib.lock);
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* }
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*
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* static void lib_unlock(void) {
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* pthread_mutex_unlock(&g_lib.lock);
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* }
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*
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* static void lib_setup(void) {
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* lib_wipe();
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* pthread_atfork(lib_lock, lib_unlock, lib_wipe);
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* }
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*
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* static void lib_init(void) {
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* pthread_once(&g_lib.once, lib_setup);
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* }
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*
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* void lib(void) {
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* lib_init();
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* lib_lock();
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* // do stuff...
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* lib_unlock();
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* }
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*
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* @param prepare is run by fork() before forking happens
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* @param parent is run by fork() after forking happens in parent process
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* @param child is run by fork() after forking happens in childe process
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* @return 0 on success, or errno on error
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* @raise ENOMEM if we require more vespene gas
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*/
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int pthread_atfork(atfork_f prepare, atfork_f parent, atfork_f child) {
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if (_weaken(_pthread_atfork)) {
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return _weaken(_pthread_atfork)(prepare, parent, child);
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} else {
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return 0;
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}
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}
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