mirror of https://gitee.com/bigwinds/arangodb
104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief read unlocker
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2011 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 triAGENS GmbH, Cologne, Germany
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///
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/// @author Frank Celler
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/// @author Achim Brandt
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/// @author Copyright 2010-2011, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef TRIAGENS_BASICS_READ_UNLOCKER_H
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#define TRIAGENS_BASICS_READ_UNLOCKER_H 1
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#include <Basics/Common.h>
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#include <Basics/ReadWriteLock.h>
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////////////////////////////////////////////////////////////////////////////////
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/// @brief construct unlocker with file and line information
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////////////////////////////////////////////////////////////////////////////////
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#define READ_UNLOCKER_VAR_A(a) _read_unlock_variable ## a
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#define READ_UNLOCKER_VAR_B(a) READ_UNLOCKER_VAR_A(a)
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#define READ_UNLOCKER(b) \
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triagens::basics::ReadUnlocker READ_UNLOCKER_VAR_B(__LINE__)(&b, __FILE__, __LINE__)
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namespace triagens {
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namespace basics {
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////////////////////////////////////////////////////////////////////////////////
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/// @ingroup Threads
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/// @brief read unlocker
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///
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/// A ReadUnlocker unlocks a read-write lock during its lifetime and reaquires
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/// the read-lock again when it is destroyed.
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////////////////////////////////////////////////////////////////////////////////
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class ReadUnlocker {
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private:
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ReadUnlocker (ReadUnlocker const&);
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ReadUnlocker& operator= (ReadUnlocker const&);
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief unlocks the lock
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///
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/// The constructors unlocks the lock, the destructors aquires a read-lock.
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///
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/// @param
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/// readWriteLock [in] read-write lock
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////////////////////////////////////////////////////////////////////////////////
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explicit
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ReadUnlocker (ReadWriteLock* readWriteLock);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief unlocks the lock
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///
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/// The constructors unlocks the lock, the destructors aquires a read-lock.
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///
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/// @param
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/// readWriteLock [in] read-write lock
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/// file [in] file
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/// line [in] line number
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////////////////////////////////////////////////////////////////////////////////
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ReadUnlocker (ReadWriteLock* readWriteLock, char const* file, int line);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief aquires the read-lock
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////////////////////////////////////////////////////////////////////////////////
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~ReadUnlocker ();
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private:
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ReadWriteLock* _readWriteLock;
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char const* _file;
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int _line;
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};
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}
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}
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#endif
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