| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: jmarantz@google.com (Joshua Marantz) |
| |
| #ifndef PAGESPEED_KERNEL_BASE_NULL_RW_LOCK_H_ |
| #define PAGESPEED_KERNEL_BASE_NULL_RW_LOCK_H_ |
| |
| #include "pagespeed/kernel/base/thread_annotations.h" |
| #include "pagespeed/kernel/base/thread_system.h" |
| |
| namespace net_instaweb { |
| |
| // Implements an empty mutex for single-threaded programs that need to work |
| // with interfaces that require mutexes. |
| class LOCKABLE NullRWLock : public ThreadSystem::RWLock { |
| public: |
| NullRWLock() {} |
| virtual ~NullRWLock(); |
| virtual bool TryLock() EXCLUSIVE_TRYLOCK_FUNCTION(true); |
| virtual void Lock() EXCLUSIVE_LOCK_FUNCTION(); |
| virtual void Unlock() UNLOCK_FUNCTION(); |
| virtual bool ReaderTryLock() SHARED_TRYLOCK_FUNCTION(true); |
| virtual void ReaderLock() SHARED_LOCK_FUNCTION(); |
| virtual void ReaderUnlock() UNLOCK_FUNCTION(); |
| virtual void DCheckReaderLocked(); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_BASE_NULL_RW_LOCK_H_ |