henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2011 The WebRTC Project Authors. All rights reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include "webrtc/base/sharedexclusivelock.h" |
| 12 | |
| 13 | namespace rtc { |
| 14 | |
| 15 | SharedExclusiveLock::SharedExclusiveLock() |
| 16 | : shared_count_is_zero_(true, true), |
| 17 | shared_count_(0) { |
| 18 | } |
| 19 | |
| 20 | void SharedExclusiveLock::LockExclusive() { |
| 21 | cs_exclusive_.Enter(); |
| 22 | shared_count_is_zero_.Wait(rtc::kForever); |
| 23 | } |
| 24 | |
| 25 | void SharedExclusiveLock::UnlockExclusive() { |
| 26 | cs_exclusive_.Leave(); |
| 27 | } |
| 28 | |
| 29 | void SharedExclusiveLock::LockShared() { |
| 30 | CritScope exclusive_scope(&cs_exclusive_); |
| 31 | CritScope shared_scope(&cs_shared_); |
| 32 | if (++shared_count_ == 1) { |
| 33 | shared_count_is_zero_.Reset(); |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | void SharedExclusiveLock::UnlockShared() { |
| 38 | CritScope shared_scope(&cs_shared_); |
| 39 | if (--shared_count_ == 0) { |
| 40 | shared_count_is_zero_.Set(); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | } // namespace rtc |