mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
464858dbb4
This fixes a regression in mmap(MAP_FIXED) on Windows caused by a recent revision. This change also fixes ZipOS so it no longer needs a MAP_FIXED mapping to open files from the PKZIP store. The memory mapping mutex was implemented incorrectly earlier which meant that ftrace and strace could cause cause crashes. This lock and other recursive mutexes are rewritten so that it should be provable that recursive mutexes in cosmopolitan are asynchronous signal safe.
59 lines
3.5 KiB
C
59 lines
3.5 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/errno.h"
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#include "libc/thread/lock.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/thread2.h"
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#include "third_party/nsync/common.internal.h"
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#include "third_party/nsync/cv.h"
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#include "third_party/nsync/time.h"
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/**
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* Waits for condition with optional time limit, e.g.
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*
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* struct timespec ts; // one second timeout
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* ts = timespec_add(timespec_real(), timespec_frommillis(1000));
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* if (pthread_cond_timedwait(cond, mutex, &ts) == ETIMEDOUT) {
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* // handle timeout...
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* }
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*
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* @param mutex needs to be held by thread when calling this function
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* @param abstime may be null to wait indefinitely and should contain
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* some arbitrary interval added to a `CLOCK_REALTIME` timestamp
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* @return 0 on success, or errno on error
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* @raise ETIMEDOUT if `abstime` was specified and the current time
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* exceeded its value
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* @raise EPERM if `mutex` is `PTHREAD_MUTEX_ERRORCHECK` and the lock
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* isn't owned by the current thread
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* @raise EINVAL if `0 ≤ abstime->tv_nsec < 1000000000` wasn't the case
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* @raise ECANCELED if calling thread was cancelled in masked mode
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* @see pthread_cond_broadcast()
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* @see pthread_cond_signal()
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* @cancelationpoint
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*/
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errno_t pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
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const struct timespec *abstime) {
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if (abstime && !(0 <= abstime->tv_nsec && abstime->tv_nsec < 1000000000))
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return EINVAL;
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if (MUTEX_TYPE(mutex->_word) != PTHREAD_MUTEX_NORMAL)
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nsync_panic_("pthread cond needs normal mutex\n");
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return nsync_cv_wait_with_deadline(
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(nsync_cv *)cond, (nsync_mu *)mutex,
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abstime ? *abstime : nsync_time_no_deadline, 0);
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}
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