mirror of https://gitee.com/bigwinds/arangodb
102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Achim Brandt
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_MUTEX_UNLOCKER_H
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#define ARANGODB_BASICS_MUTEX_UNLOCKER_H 1
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#include "Basics/Common.h"
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#include "Basics/Locking.h"
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#ifdef TRI_SHOW_LOCK_TIME
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#include "Logger/Logger.h"
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#endif
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#include <thread>
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#define MUTEX_UNLOCKER(obj, lock) \
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arangodb::basics::MutexUnlocker<typename std::decay<decltype(lock)>::type> obj(&(lock), __FILE__, __LINE__)
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namespace arangodb {
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namespace basics {
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/// @brief mutex locker
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/// A MutexUnlocker unlocks a mutex during its lifetime und locks the mutex
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/// when it is destroyed.
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template <class LockType>
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class MutexUnlocker {
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MutexUnlocker(MutexUnlocker const&) = delete;
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MutexUnlocker& operator=(MutexUnlocker const&) = delete;
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public:
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/// The constructor unlocks the mutex, the destructor locks the mutex.
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MutexUnlocker(LockType* mutex, char const* file, int line)
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: _mutex(mutex), _file(file), _line(line), _isLocked(true) {
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unlock();
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}
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/// @brief releases the read-lock
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~MutexUnlocker() {
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if (!_isLocked) {
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lock();
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}
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}
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bool isLocked() const { return _isLocked; }
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/// @brief acquire the mutex, blocking
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void lock() {
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TRI_ASSERT(!_isLocked);
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_mutex->lock();
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_isLocked = true;
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}
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/// @brief unlocks the mutex if we own it
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bool unlock() {
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if (_isLocked) {
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_isLocked = false;
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_mutex->unlock();
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return true;
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}
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return false;
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}
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private:
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/// @brief the mutex
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LockType* _mutex;
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/// @brief file
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char const* _file;
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/// @brief line number
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int _line;
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/// @brief whether or not the mutex is locked
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bool _isLocked;
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};
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} // namespace basics
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} // namespace arangodb
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#endif
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