forked from mirrors/gecko-dev
97bc60386d
This is consistent with how xpcom's Mutex has its platform-dependent code in mozglue, and will allow readers-writer locks in mozglue without duplication. Differential Revision: https://phabricator.services.mozilla.com/D139669
64 lines
2.2 KiB
C++
64 lines
2.2 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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#ifdef XP_WIN
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# error This file should only be compiled on non-Windows platforms.
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#endif
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#include "mozilla/PlatformRWLock.h"
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#include "mozilla/Assertions.h"
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#include <errno.h>
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// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
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mozilla::detail::RWLockImpl::RWLockImpl() {
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MOZ_RELEASE_ASSERT(pthread_rwlock_init(&mRWLock, nullptr) == 0,
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"pthread_rwlock_init failed");
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}
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mozilla::detail::RWLockImpl::~RWLockImpl() {
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MOZ_RELEASE_ASSERT(pthread_rwlock_destroy(&mRWLock) == 0,
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"pthread_rwlock_destroy failed");
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}
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bool mozilla::detail::RWLockImpl::tryReadLock() {
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int rv = pthread_rwlock_tryrdlock(&mRWLock);
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// We allow EDEADLK here because it has been observed returned on macos when
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// the write lock is held by the current thread.
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MOZ_RELEASE_ASSERT(rv == 0 || rv == EBUSY || rv == EDEADLK,
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"pthread_rwlock_tryrdlock failed");
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return rv == 0;
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}
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void mozilla::detail::RWLockImpl::readLock() {
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MOZ_RELEASE_ASSERT(pthread_rwlock_rdlock(&mRWLock) == 0,
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"pthread_rwlock_rdlock failed");
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}
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void mozilla::detail::RWLockImpl::readUnlock() {
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MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(&mRWLock) == 0,
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"pthread_rwlock_unlock failed");
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}
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bool mozilla::detail::RWLockImpl::tryWriteLock() {
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int rv = pthread_rwlock_trywrlock(&mRWLock);
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// We allow EDEADLK here because it has been observed returned on macos when
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// the write lock is held by the current thread.
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MOZ_RELEASE_ASSERT(rv == 0 || rv == EBUSY || rv == EDEADLK,
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"pthread_rwlock_trywrlock failed");
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return rv == 0;
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}
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void mozilla::detail::RWLockImpl::writeLock() {
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MOZ_RELEASE_ASSERT(pthread_rwlock_wrlock(&mRWLock) == 0,
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"pthread_rwlock_wrlock failed");
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}
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void mozilla::detail::RWLockImpl::writeUnlock() {
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MOZ_RELEASE_ASSERT(pthread_rwlock_unlock(&mRWLock) == 0,
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"pthread_rwlock_unlock failed");
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}
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