| // Copyright (c) 2011 The LevelDB Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. See the AUTHORS file for names of contributors. |
| |
| #ifndef STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_ |
| #define STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_ |
| |
| #include "port/port.h" |
| #include "port/thread_annotations.h" |
| |
| namespace leveldb { |
| |
| // Helper class that locks a mutex on construction and unlocks the mutex when |
| // the destructor of the MutexLock object is invoked. |
| // |
| // Typical usage: |
| // |
| // void MyClass::MyMethod() { |
| // MutexLock l(&mu_); // mu_ is an instance variable |
| // ... some complex code, possibly with multiple return paths ... |
| // } |
| |
| class SCOPED_LOCKABLE MutexLock { |
| public: |
| explicit MutexLock(port::Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu) |
| : mu_(mu) { |
| this->mu_->Lock(); |
| } |
| ~MutexLock() UNLOCK_FUNCTION() { this->mu_->Unlock(); } |
| |
| private: |
| port::Mutex *const mu_; |
| // No copying allowed |
| MutexLock(const MutexLock&); |
| void operator=(const MutexLock&); |
| }; |
| |
| } // namespace leveldb |
| |
| |
| #endif // STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_ |