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/**
* Copyright (C) 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include "mongo/base/string_data.h"
#include "mongo/config.h"
#include "mongo/platform/atomic_word.h"
namespace mongo {
/** separated out as later the implementation of this may be different than RWLock,
depending on OS, as there is no upgrade etc. facility herein.
*/
class SimpleRWLock {
MONGO_DISALLOW_COPYING(SimpleRWLock);
#if defined(NTDDI_VERSION) && defined(NTDDI_WIN7) && (NTDDI_VERSION >= NTDDI_WIN7)
SRWLOCK _lock;
#else
RWLockBase m;
#endif
#if defined(_WIN32) && defined(MONGO_CONFIG_DEBUG_BUILD)
AtomicUInt32 shares;
ThreadLocalValue<int> s;
unsigned tid;
#endif
public:
const std::string name;
SimpleRWLock(StringData name = "" );
void lock();
void unlock();
void lock_shared();
void unlock_shared();
class Shared {
MONGO_DISALLOW_COPYING(Shared);
SimpleRWLock& _r;
public:
Shared(SimpleRWLock& rwlock) : _r(rwlock) {_r.lock_shared(); }
~Shared() { _r.unlock_shared(); }
};
class Exclusive {
MONGO_DISALLOW_COPYING(Exclusive);
SimpleRWLock& _r;
public:
Exclusive(SimpleRWLock& rwlock) : _r(rwlock) {_r.lock(); }
~Exclusive() { _r.unlock(); }
};
};
}
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