mirror of https://gitee.com/bigwinds/arangodb
130 lines
3.7 KiB
C++
130 lines
3.7 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 LIB_BASICS_SPIN_LOCKER_H
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#define LIB_BASICS_SPIN_LOCKER_H 1
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#include "Basics/Common.h"
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#include "Basics/SpinLock.h"
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////////////////////////////////////////////////////////////////////////////////
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/// @brief construct locker with file and line information
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///
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/// Ones needs to use macros twice to get a unique variable based on the line
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/// number.
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////////////////////////////////////////////////////////////////////////////////
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#define SPIN_LOCKER_VAR_A(a) _spin_lock_variable_##a
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#define SPIN_LOCKER_VAR_B(a) SPIN_LOCKER_VAR_A(a)
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#ifdef TRI_SHOW_LOCK_TIME
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#define SPIN_LOCKER(b) \
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triagens::basics::SpinLocker SPIN_LOCKER_VAR_B(__LINE__)(&b, __FILE__, \
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__LINE__)
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#else
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#define SPIN_LOCKER(b) \
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triagens::basics::SpinLocker SPIN_LOCKER_VAR_B(__LINE__)(&b)
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#endif
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namespace triagens {
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namespace basics {
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////////////////////////////////////////////////////////////////////////////////
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/// @brief spin locker
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///
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/// A SpinLocker locks a spinlock during its lifetime und unlocks the spinlock
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/// when it is destroyed.
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////////////////////////////////////////////////////////////////////////////////
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class SpinLocker {
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SpinLocker(SpinLocker const&);
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SpinLocker& operator=(SpinLocker const&);
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief aquires a lock
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///
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/// The constructor aquires a lock, the destructors releases the lock.
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_SHOW_LOCK_TIME
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SpinLocker(SpinLock*, char const* file, int line);
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#else
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explicit SpinLocker(SpinLock*);
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#endif
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//////////////////////////////////////////////////////////////////////////////
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/// @brief releases the lock
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//////////////////////////////////////////////////////////////////////////////
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~SpinLocker();
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief the mutex
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//////////////////////////////////////////////////////////////////////////////
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SpinLock* _lock;
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#ifdef TRI_SHOW_LOCK_TIME
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//////////////////////////////////////////////////////////////////////////////
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/// @brief file
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//////////////////////////////////////////////////////////////////////////////
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char const* _file;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief line number
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//////////////////////////////////////////////////////////////////////////////
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int _line;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief lock time
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//////////////////////////////////////////////////////////////////////////////
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double _time;
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#endif
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};
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}
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}
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#endif
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