e8493326f2
ConditionVariableEventWin remains for now since it's still needed for the rw lock on Windows XP. BUG= R=pbos@webrtc.org Review URL: https://codereview.webrtc.org/1601523009 . Cr-Commit-Position: refs/heads/master@{#11317}
80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/system_wrappers/source/rw_lock_winxp_win.h"
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namespace webrtc {
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namespace {
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class ScopedLock {
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public:
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ScopedLock(CRITICAL_SECTION* lock) : lock_(lock) {
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EnterCriticalSection(lock_);
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}
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~ScopedLock() {
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LeaveCriticalSection(lock_);
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}
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private:
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CRITICAL_SECTION* const lock_;
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};
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}
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RWLockWinXP::RWLockWinXP() {
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InitializeCriticalSection(&critical_section_);
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}
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RWLockWinXP::~RWLockWinXP() {
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DeleteCriticalSection(&critical_section_);
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}
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void RWLockWinXP::AcquireLockExclusive() {
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ScopedLock cs(&critical_section_);
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if (writer_active_ || readers_active_ > 0) {
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++writers_waiting_;
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while (writer_active_ || readers_active_ > 0) {
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write_condition_.SleepCS(&critical_section_);
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}
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--writers_waiting_;
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}
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writer_active_ = true;
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}
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void RWLockWinXP::ReleaseLockExclusive() {
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ScopedLock cs(&critical_section_);
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writer_active_ = false;
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if (writers_waiting_ > 0) {
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write_condition_.Wake();
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} else if (readers_waiting_ > 0) {
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read_condition_.WakeAll();
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}
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}
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void RWLockWinXP::AcquireLockShared() {
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ScopedLock cs(&critical_section_);
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if (writer_active_ || writers_waiting_ > 0) {
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++readers_waiting_;
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while (writer_active_ || writers_waiting_ > 0) {
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read_condition_.SleepCS(&critical_section_);
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}
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--readers_waiting_;
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}
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++readers_active_;
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}
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void RWLockWinXP::ReleaseLockShared() {
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ScopedLock cs(&critical_section_);
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--readers_active_;
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if (readers_active_ == 0 && writers_waiting_ > 0) {
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write_condition_.Wake();
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}
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}
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} // namespace webrtc
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