зеркало из https://github.com/mozilla/gecko-dev.git
94 строки
3.0 KiB
C++
94 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Assertions.h"
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include "mozilla/PlatformMutex.h"
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#include "MutexPlatformData_posix.h"
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#define TRY_CALL_PTHREADS(call, msg) \
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{ \
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int result = (call); \
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if (result != 0) { \
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errno = result; \
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perror(msg); \
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MOZ_CRASH(msg); \
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} \
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}
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mozilla::detail::MutexImpl::MutexImpl()
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{
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pthread_mutexattr_t* attrp = nullptr;
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// Linux with glibc and FreeBSD support adaptive mutexes that spin
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// for a short number of tries before sleeping. NSPR's locks did
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// this, too, and it seems like a reasonable thing to do.
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#if (defined(__linux__) && defined(__GLIBC__)) || defined(__FreeBSD__)
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#define ADAPTIVE_MUTEX_SUPPORTED
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#endif
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#if defined(DEBUG)
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#define ATTR_REQUIRED
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#define MUTEX_KIND PTHREAD_MUTEX_ERRORCHECK
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#elif defined(ADAPTIVE_MUTEX_SUPPORTED)
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#define ATTR_REQUIRED
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#define MUTEX_KIND PTHREAD_MUTEX_ADAPTIVE_NP
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#endif
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#if defined(ATTR_REQUIRED)
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pthread_mutexattr_t attr;
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TRY_CALL_PTHREADS(pthread_mutexattr_init(&attr),
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"mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_init failed");
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TRY_CALL_PTHREADS(pthread_mutexattr_settype(&attr, MUTEX_KIND),
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"mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_settype failed");
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attrp = &attr;
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#endif
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TRY_CALL_PTHREADS(pthread_mutex_init(&platformData()->ptMutex, attrp),
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"mozilla::detail::MutexImpl::MutexImpl: pthread_mutex_init failed");
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#if defined(ATTR_REQUIRED)
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TRY_CALL_PTHREADS(pthread_mutexattr_destroy(&attr),
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"mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_destroy failed");
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#endif
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}
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mozilla::detail::MutexImpl::~MutexImpl()
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{
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TRY_CALL_PTHREADS(pthread_mutex_destroy(&platformData()->ptMutex),
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"mozilla::detail::MutexImpl::~MutexImpl: pthread_mutex_destroy failed");
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}
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void
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mozilla::detail::MutexImpl::lock()
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{
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TRY_CALL_PTHREADS(pthread_mutex_lock(&platformData()->ptMutex),
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"mozilla::detail::MutexImpl::lock: pthread_mutex_lock failed");
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}
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void
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mozilla::detail::MutexImpl::unlock()
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{
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TRY_CALL_PTHREADS(pthread_mutex_unlock(&platformData()->ptMutex),
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"mozilla::detail::MutexImpl::unlock: pthread_mutex_unlock failed");
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}
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#undef TRY_CALL_PTHREADS
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mozilla::detail::MutexImpl::PlatformData*
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mozilla::detail::MutexImpl::platformData()
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{
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static_assert(sizeof(platformData_) >= sizeof(PlatformData),
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"platformData_ is too small");
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return reinterpret_cast<PlatformData*>(platformData_);
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}
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