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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/' ```
87 lines
3.6 KiB
C
87 lines
3.6 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 2023 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/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/weaken.h"
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#include "libc/runtime/internal.h"
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#include "libc/thread/thread.h"
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#include "third_party/nsync/mu.h"
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/**
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* Attempts acquiring lock.
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*
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* Unlike pthread_mutex_lock() this function won't block and instead
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* returns an error immediately if the lock couldn't be acquired.
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*
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* @return 0 if lock was acquired, otherwise an errno
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* @raise EAGAIN if maximum number of recursive locks is held
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* @raise EBUSY if lock is currently held in read or write mode
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* @raise EINVAL if `mutex` doesn't refer to an initialized lock
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* @raise EDEADLK if `mutex` is `PTHREAD_MUTEX_ERRORCHECK` and the
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* current thread already holds this mutex
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*/
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errno_t pthread_mutex_trylock(pthread_mutex_t *mutex) {
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int t;
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// delegate to *NSYNC if possible
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if (mutex->_type == PTHREAD_MUTEX_NORMAL &&
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mutex->_pshared == PTHREAD_PROCESS_PRIVATE && //
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_weaken(nsync_mu_trylock)) {
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if (_weaken(nsync_mu_trylock)((nsync_mu *)mutex)) {
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return 0;
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} else {
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return EBUSY;
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}
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}
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// handle normal mutexes
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if (mutex->_type == PTHREAD_MUTEX_NORMAL) {
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if (!atomic_exchange_explicit(&mutex->_lock, 1, memory_order_acquire)) {
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return 0;
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} else {
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return EBUSY;
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}
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}
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// handle recursive and error check mutexes
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t = gettid();
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if (mutex->_owner == t) {
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if (mutex->_type != PTHREAD_MUTEX_ERRORCHECK) {
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if (mutex->_depth < 63) {
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++mutex->_depth;
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return 0;
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} else {
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return EAGAIN;
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}
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} else {
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return EDEADLK;
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}
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}
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if (atomic_exchange_explicit(&mutex->_lock, 1, memory_order_acquire)) {
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return EBUSY;
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}
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mutex->_depth = 0;
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mutex->_owner = t;
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mutex->_pid = __pid;
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return 0;
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}
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