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/*
* Copyright (C) 2010 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 <boost/thread/condition.hpp>
#include <boost/thread/mutex.hpp>
#include "mongo/bson/util/atomic_int.h"
#include "mongo/base/disallow_copying.h"
namespace mongo {
/* _globalKill: we are shutting down
otherwise kill attribute set on specified CurOp
this class does not handle races between interruptJs and the checkForInterrupt functions - those must be
handled by the client of this class
*/
class KillCurrentOp {
MONGO_DISALLOW_COPYING(KillCurrentOp);
public:
KillCurrentOp() : _globalKill(false) {}
void killAll();
/**
* @param i opid of operation to kill
* @return if operation was found
**/
bool kill(AtomicUInt i);
/**
* blocks until kill is acknowledged by the killee.
*
* Note: Does not wait for nested ops, only the top level op.
*/
void blockingKill(AtomicUInt opId);
/** @return true if global interrupt and should terminate the operation */
bool globalInterruptCheck() const { return _globalKill; }
/**
* @param heedMutex if true and have a write lock, won't kill op since it might be unsafe
*/
void checkForInterrupt( bool heedMutex = true );
/** @return "" if not interrupted. otherwise, you should stop. */
const char *checkForInterruptNoAssert();
/** set all flags for all the threads waiting for the current thread's operation to
* end; part of internal synchronous kill mechanism
**/
void notifyAllWaiters();
/** Reset the object to its initial state. Only for testing. */
void reset();
private:
void interruptJs( AtomicUInt *op );
volatile bool _globalKill;
boost::condition _condvar;
boost::mutex _mtx;
/**
* @param i opid of operation to kill
* @param pNotifyFlag optional bool to be set to true when kill actually happens
* @return if operation was found
**/
bool _killImpl_inclientlock(AtomicUInt i, bool* pNotifyFlag = NULL);
};
extern KillCurrentOp killCurrentOp;
}
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