/usr/include/mongo/util/concurrency/simplerwlock.h is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | /**
* 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/>.
*/
#pragma once
#include "mongo/base/string_data.h"
#include "mongo/bson/util/atomic_int.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 : boost::noncopyable {
#if defined(_WIN32) && defined(MONGO_USE_SRW_ON_WINDOWS)
SRWLOCK _lock;
#else
RWLockBase m;
#endif
#if defined(_WIN32) && defined(_DEBUG)
AtomicUInt shares;
ThreadLocalValue<int> s;
unsigned tid;
#endif
public:
const string name;
SimpleRWLock(const StringData& name = "" );
void lock();
void unlock();
void lock_shared();
void unlock_shared();
class Shared : boost::noncopyable {
SimpleRWLock& _r;
public:
Shared(SimpleRWLock& rwlock) : _r(rwlock) {_r.lock_shared(); }
~Shared() { _r.unlock_shared(); }
};
class Exclusive : boost::noncopyable {
SimpleRWLock& _r;
public:
Exclusive(SimpleRWLock& rwlock) : _r(rwlock) {_r.lock(); }
~Exclusive() { _r.unlock(); }
};
};
}
|