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78 lines
2.2 KiB
C++
78 lines
2.2 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_generic.h"
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#include "webrtc/system_wrappers/interface/condition_variable_wrapper.h"
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#include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
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namespace webrtc {
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RWLockGeneric::RWLockGeneric()
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: readers_active_(0),
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writer_active_(false),
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readers_waiting_(0),
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writers_waiting_(0) {
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critical_section_ = CriticalSectionWrapper::CreateCriticalSection();
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read_condition_ = ConditionVariableWrapper::CreateConditionVariable();
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write_condition_ = ConditionVariableWrapper::CreateConditionVariable();
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}
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RWLockGeneric::~RWLockGeneric() {
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delete write_condition_;
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delete read_condition_;
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delete critical_section_;
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}
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void RWLockGeneric::AcquireLockExclusive() {
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CriticalSectionScoped 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 RWLockGeneric::ReleaseLockExclusive() {
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CriticalSectionScoped 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 RWLockGeneric::AcquireLockShared() {
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CriticalSectionScoped 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 RWLockGeneric::ReleaseLockShared() {
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CriticalSectionScoped 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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