mirror of https://gitee.com/bigwinds/arangodb
117 lines
4.1 KiB
C++
117 lines
4.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
/// DISCLAIMER
|
|
///
|
|
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
|
|
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
|
|
///
|
|
/// 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.
|
|
///
|
|
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// @author Frank Celler
|
|
/// @author Achim Brandt
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef LIB_BASICS_READ_WRITE_LOCK_H
|
|
#define LIB_BASICS_READ_WRITE_LOCK_H 1
|
|
|
|
#include "Basics/Common.h"
|
|
#include "Basics/locks.h"
|
|
|
|
namespace arangodb {
|
|
namespace basics {
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief read-write lock
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
class ReadWriteLock {
|
|
ReadWriteLock(ReadWriteLock const&) = delete;
|
|
ReadWriteLock& operator=(ReadWriteLock const&) = delete;
|
|
|
|
public:
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief constructs a read-write lock
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
ReadWriteLock();
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief deletes read-write lock
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
~ReadWriteLock();
|
|
|
|
public:
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief locks for reading
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
void readLock();
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief tries to lock for reading
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool tryReadLock();
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief tries to lock for reading, sleeping if the lock cannot be
|
|
/// acquired instantly, sleepTime is in microseconds
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool tryReadLock(uint64_t sleepTime);
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief locks for writing
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
void writeLock();
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief tries to lock for writing
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool tryWriteLock();
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief tries to lock for writing, sleeping if the lock cannot be
|
|
/// acquired instantly, sleepTime is in microseconds
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool tryWriteLock(uint64_t sleepTime);
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief releases the read-lock or write-lock
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
void unlock();
|
|
|
|
private:
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief read-write lock variable
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
TRI_read_write_lock_t _rwlock;
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief write lock marker
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool _writeLocked;
|
|
};
|
|
}
|
|
}
|
|
|
|
#endif
|