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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "base/synchronization/read_write_lock.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 |
| 9 namespace base { |
| 10 namespace subtle { |
| 11 |
| 12 ReadWriteLock::ReadWriteLock() {} |
| 13 |
| 14 ReadWriteLock::~ReadWriteLock() { |
| 15 DCHECK_EQ(0u, readers_); |
| 16 int result = pthread_mutex_destroy(&writer_lock_); |
| 17 DCHECK_EQ(result, 0) << ". " << strerror(result); |
| 18 } |
| 19 |
| 20 void ReadWriteLock::ReadAcquire() { |
| 21 AutoLock hold(native_handle_); |
| 22 readers_++; |
| 23 if (readers_ == 1) { |
| 24 int result = pthread_mutex_lock(&writer_lock_); |
| 25 DCHECK_EQ(result, 0) << ". " << strerror(result); |
| 26 } |
| 27 } |
| 28 |
| 29 void ReadWriteLock::ReadRelease() { |
| 30 AutoLock hold(native_handle_); |
| 31 readers_--; |
| 32 if (readers_ == 0) { |
| 33 int result = pthread_mutex_unlock(&writer_lock_); |
| 34 DCHECK_EQ(result, 0) << ". " << strerror(result); |
| 35 } |
| 36 } |
| 37 |
| 38 void ReadWriteLock::WriteAcquire() { |
| 39 int result = pthread_mutex_lock(&writer_lock_); |
| 40 DCHECK_EQ(result, 0) << ". " << strerror(result); |
| 41 } |
| 42 |
| 43 void ReadWriteLock::WriteRelease() { |
| 44 int result = pthread_mutex_unlock(&writer_lock_); |
| 45 DCHECK_EQ(result, 0) << ". " << strerror(result); |
| 46 } |
| 47 |
| 48 } // namespace subtle |
| 49 } // namespace base |
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