rhubarb-lip-sync/rhubarb/lib/webrtc-8d2248ff/webrtc/base/sharedexclusivelock.cc

45 lines
1.1 KiB
C++

/*
* Copyright 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/base/sharedexclusivelock.h"
namespace rtc {
SharedExclusiveLock::SharedExclusiveLock()
: shared_count_is_zero_(true, true),
shared_count_(0) {
}
void SharedExclusiveLock::LockExclusive() {
cs_exclusive_.Enter();
shared_count_is_zero_.Wait(Event::kForever);
}
void SharedExclusiveLock::UnlockExclusive() {
cs_exclusive_.Leave();
}
void SharedExclusiveLock::LockShared() {
CritScope exclusive_scope(&cs_exclusive_);
CritScope shared_scope(&cs_shared_);
if (++shared_count_ == 1) {
shared_count_is_zero_.Reset();
}
}
void SharedExclusiveLock::UnlockShared() {
CritScope shared_scope(&cs_shared_);
if (--shared_count_ == 0) {
shared_count_is_zero_.Set();
}
}
} // namespace rtc