mirror of
https://github.com/oxen-io/session-android.git
synced 2024-11-30 21:45:20 +00:00
78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
/*
|
|
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#include "webrtc/system_wrappers/source/rw_lock_generic.h"
|
|
|
|
#include "webrtc/system_wrappers/interface/condition_variable_wrapper.h"
|
|
#include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
|
|
|
|
namespace webrtc {
|
|
|
|
RWLockGeneric::RWLockGeneric()
|
|
: readers_active_(0),
|
|
writer_active_(false),
|
|
readers_waiting_(0),
|
|
writers_waiting_(0) {
|
|
critical_section_ = CriticalSectionWrapper::CreateCriticalSection();
|
|
read_condition_ = ConditionVariableWrapper::CreateConditionVariable();
|
|
write_condition_ = ConditionVariableWrapper::CreateConditionVariable();
|
|
}
|
|
|
|
RWLockGeneric::~RWLockGeneric() {
|
|
delete write_condition_;
|
|
delete read_condition_;
|
|
delete critical_section_;
|
|
}
|
|
|
|
void RWLockGeneric::AcquireLockExclusive() {
|
|
CriticalSectionScoped cs(critical_section_);
|
|
if (writer_active_ || readers_active_ > 0) {
|
|
++writers_waiting_;
|
|
while (writer_active_ || readers_active_ > 0) {
|
|
write_condition_->SleepCS(*critical_section_);
|
|
}
|
|
--writers_waiting_;
|
|
}
|
|
writer_active_ = true;
|
|
}
|
|
|
|
void RWLockGeneric::ReleaseLockExclusive() {
|
|
CriticalSectionScoped cs(critical_section_);
|
|
writer_active_ = false;
|
|
if (writers_waiting_ > 0) {
|
|
write_condition_->Wake();
|
|
} else if (readers_waiting_ > 0) {
|
|
read_condition_->WakeAll();
|
|
}
|
|
}
|
|
|
|
void RWLockGeneric::AcquireLockShared() {
|
|
CriticalSectionScoped cs(critical_section_);
|
|
if (writer_active_ || writers_waiting_ > 0) {
|
|
++readers_waiting_;
|
|
|
|
while (writer_active_ || writers_waiting_ > 0) {
|
|
read_condition_->SleepCS(*critical_section_);
|
|
}
|
|
--readers_waiting_;
|
|
}
|
|
++readers_active_;
|
|
}
|
|
|
|
void RWLockGeneric::ReleaseLockShared() {
|
|
CriticalSectionScoped cs(critical_section_);
|
|
--readers_active_;
|
|
if (readers_active_ == 0 && writers_waiting_ > 0) {
|
|
write_condition_->Wake();
|
|
}
|
|
}
|
|
|
|
} // namespace webrtc
|