mirror of
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94 lines
2.2 KiB
C++
94 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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#include "mozilla/Assertions.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/NullPtr.h"
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#include "LulRWLock.h"
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namespace lul {
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// An implementation for targets where libpthread does provide
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// pthread_rwlock_t. These are straight wrappers around the
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// equivalent pthread functions.
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#if defined(LUL_OS_linux)
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LulRWLock::LulRWLock() {
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mozilla::DebugOnly<int> r = pthread_rwlock_init(&mLock, nullptr);
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MOZ_ASSERT(!r);
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}
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LulRWLock::~LulRWLock() {
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mozilla::DebugOnly<int>r = pthread_rwlock_destroy(&mLock);
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MOZ_ASSERT(!r);
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}
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void
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LulRWLock::WrLock() {
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mozilla::DebugOnly<int>r = pthread_rwlock_wrlock(&mLock);
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MOZ_ASSERT(!r);
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}
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void
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LulRWLock::RdLock() {
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mozilla::DebugOnly<int>r = pthread_rwlock_rdlock(&mLock);
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MOZ_ASSERT(!r);
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}
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void
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LulRWLock::Unlock() {
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mozilla::DebugOnly<int>r = pthread_rwlock_unlock(&mLock);
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MOZ_ASSERT(!r);
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}
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// An implementation for cases where libpthread does not provide
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// pthread_rwlock_t. Currently this is a kludge in that it uses
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// normal mutexes, resulting in the following limitations: (1) at most
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// one reader is allowed at once, and (2) any thread that tries to
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// read-acquire the lock more than once will deadlock. (2) could be
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// avoided if it were possible to use recursive pthread_mutex_t's.
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#elif defined(LUL_OS_android)
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LulRWLock::LulRWLock() {
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mozilla::DebugOnly<int> r = pthread_mutex_init(&mLock, nullptr);
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MOZ_ASSERT(!r);
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}
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LulRWLock::~LulRWLock() {
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mozilla::DebugOnly<int>r = pthread_mutex_destroy(&mLock);
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MOZ_ASSERT(!r);
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}
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void
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LulRWLock::WrLock() {
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mozilla::DebugOnly<int>r = pthread_mutex_lock(&mLock);
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MOZ_ASSERT(!r);
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}
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void
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LulRWLock::RdLock() {
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mozilla::DebugOnly<int>r = pthread_mutex_lock(&mLock);
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MOZ_ASSERT(!r);
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}
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void
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LulRWLock::Unlock() {
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mozilla::DebugOnly<int>r = pthread_mutex_unlock(&mLock);
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MOZ_ASSERT(!r);
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}
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#else
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# error "Unsupported OS"
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#endif
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} // namespace lul
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