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https://github.com/mozilla/gecko-dev.git
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5c1d5c00b9
This also does minimal refactoring of cases where the directives were protecting a simple expression that could be refactored back to the callers. Differential Revision: https://phabricator.services.mozilla.com/D184399
132 lines
4.1 KiB
C++
132 lines
4.1 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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#if defined(XP_DARWIN)
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# include <pthread_spis.h>
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#endif
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#include "mozilla/PlatformMutex.h"
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#include "MutexPlatformData_posix.h"
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#define REPORT_PTHREADS_ERROR(result, msg) \
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{ \
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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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#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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REPORT_PTHREADS_ERROR(result, msg); \
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} \
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}
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mozilla::detail::MutexImpl::MutexImpl() {
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pthread_mutexattr_t* attrp = nullptr;
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#if defined(DEBUG)
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# define MUTEX_KIND PTHREAD_MUTEX_ERRORCHECK
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// Linux with glibc, FreeBSD and macOS 10.14+ support adaptive mutexes that
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// spin for a short number of tries before sleeping. NSPR's locks did this,
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// too, and it seems like a reasonable thing to do.
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#elif (defined(__linux__) && defined(__GLIBC__)) || defined(__FreeBSD__)
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# define MUTEX_KIND PTHREAD_MUTEX_ADAPTIVE_NP
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#elif defined(XP_DARWIN)
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# if defined(PTHREAD_MUTEX_POLICY_FIRSTFIT_NP)
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# define POLICY_KIND PTHREAD_MUTEX_POLICY_FIRSTFIT_NP
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# else
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# define POLICY_KIND (3) // The definition is missing in old SDKs
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# endif
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#endif
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#if defined(MUTEX_KIND) || defined(POLICY_KIND)
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# define ATTR_REQUIRED
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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(
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pthread_mutexattr_init(&attr),
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"mozilla::detail::MutexImpl::MutexImpl: pthread_mutexattr_init failed");
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# if defined(MUTEX_KIND)
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TRY_CALL_PTHREADS(pthread_mutexattr_settype(&attr, MUTEX_KIND),
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"mozilla::detail::MutexImpl::MutexImpl: "
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"pthread_mutexattr_settype failed");
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# elif defined(POLICY_KIND)
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TRY_CALL_PTHREADS(pthread_mutexattr_setpolicy_np(&attr, POLICY_KIND),
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"mozilla::detail::MutexImpl::MutexImpl: "
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"pthread_mutexattr_setpolicy_np failed");
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# endif
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attrp = &attr;
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#endif
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TRY_CALL_PTHREADS(
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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: "
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"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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TRY_CALL_PTHREADS(
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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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inline void mozilla::detail::MutexImpl::mutexLock() {
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TRY_CALL_PTHREADS(
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pthread_mutex_lock(&platformData()->ptMutex),
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"mozilla::detail::MutexImpl::mutexLock: pthread_mutex_lock failed");
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}
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bool mozilla::detail::MutexImpl::tryLock() { return mutexTryLock(); }
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bool mozilla::detail::MutexImpl::mutexTryLock() {
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int result = pthread_mutex_trylock(&platformData()->ptMutex);
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if (result == 0) {
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return true;
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}
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if (result == EBUSY) {
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return false;
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}
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REPORT_PTHREADS_ERROR(
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result,
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"mozilla::detail::MutexImpl::mutexTryLock: pthread_mutex_trylock failed");
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}
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void mozilla::detail::MutexImpl::lock() { mutexLock(); }
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void mozilla::detail::MutexImpl::unlock() {
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TRY_CALL_PTHREADS(
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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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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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