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