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// @file rwlockimpl.cpp
/**
* 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.
*/
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include <windows.h>
#endif
#include <map>
#include <set>
#include <boost/version.hpp>
#include "mongo/config.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/concurrency/rwlockimpl.h"
#include "mongo/util/concurrency/simplerwlock.h"
#include "mongo/util/concurrency/threadlocal.h"
#include "mongo/util/time_support.h"
using namespace std;
namespace mongo {
#if defined(NTDDI_VERSION) && defined(NTDDI_WIN7) && (NTDDI_VERSION >= NTDDI_WIN7)
SimpleRWLock::SimpleRWLock(StringData p) : name(p.toString()) {
InitializeSRWLock(&_lock);
}
# if defined(MONGO_CONFIG_DEBUG_BUILD)
// the code below in a debug build will check that we don't try to recursively lock,
// which is not supported by this class. also checks that you don't unlock without
// having locked
void SimpleRWLock::lock() {
unsigned me = GetCurrentThreadId();
int& state = s.getRef();
dassert( state == 0 );
state--;
AcquireSRWLockExclusive(&_lock);
tid = me; // this is for use in the debugger to see who does have the lock
}
void SimpleRWLock::unlock() {
int& state = s.getRef();
dassert( state == -1 );
state++;
tid = 0xffffffff;
ReleaseSRWLockExclusive(&_lock);
}
void SimpleRWLock::lock_shared() {
int& state = s.getRef();
dassert( state == 0 );
state++;
AcquireSRWLockShared(&_lock);
shares.fetchAndAdd(1);
}
void SimpleRWLock::unlock_shared() {
int& state = s.getRef();
dassert( state == 1 );
state--;
shares.fetchAndSubtract(1);
ReleaseSRWLockShared(&_lock);
}
# else
void SimpleRWLock::lock() {
AcquireSRWLockExclusive(&_lock);
}
void SimpleRWLock::unlock() {
ReleaseSRWLockExclusive(&_lock);
}
void SimpleRWLock::lock_shared() {
AcquireSRWLockShared(&_lock);
}
void SimpleRWLock::unlock_shared() {
ReleaseSRWLockShared(&_lock);
}
# endif
#else
SimpleRWLock::SimpleRWLock(StringData p) : name(p.toString()) { }
void SimpleRWLock::lock() { m.lock(); }
void SimpleRWLock::unlock() { m.unlock(); }
void SimpleRWLock::lock_shared() { m.lock_shared(); }
void SimpleRWLock::unlock_shared() { m.unlock_shared(); }
#endif
}
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