| /* |
| * libjingle |
| * Copyright 2011, Google Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "talk/base/sharedexclusivelock.h" |
| |
| namespace talk_base { |
| |
| SharedExclusiveLock::SharedExclusiveLock() |
| : shared_count_is_zero_(true, true), |
| shared_count_(0) { |
| } |
| |
| void SharedExclusiveLock::LockExclusive() { |
| cs_exclusive_.Enter(); |
| shared_count_is_zero_.Wait(talk_base::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 talk_base |