mirror of
https://github.com/mongodb/mongo.git
synced 2024-12-01 09:32:32 +01:00
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/**
|
|
* Copyright (C) 2008 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
|
|
|
|
/* object-orienty background thread dispatching.
|
|
|
|
subclass and define run()
|
|
|
|
It is ok to call go() more than once -- if the previous invocation
|
|
has finished. Thus one pattern of use is to embed a backgroundjob
|
|
in your object and reuse it (or same thing with inheritance).
|
|
*/
|
|
|
|
class BackgroundJob {
|
|
protected:
|
|
/* define this to do your work! */
|
|
virtual void run() = 0;
|
|
|
|
public:
|
|
enum State {
|
|
NotStarted,
|
|
Running,
|
|
Done
|
|
};
|
|
State getState() const { return state; }
|
|
bool running() const { return state == Running; }
|
|
|
|
bool deleteSelf; // delete self when Done?
|
|
|
|
BackgroundJob() { deleteSelf = false; state = NotStarted; }
|
|
virtual ~BackgroundJob() { }
|
|
|
|
// start job. returns before it's finished.
|
|
BackgroundJob& go();
|
|
|
|
// wait for completion. this spins with sleep() so not terribly efficient.
|
|
// returns true if did not time out.
|
|
//
|
|
// note you can call wait() more than once if the first call times out.
|
|
bool wait(int msMax = 0);
|
|
|
|
private:
|
|
static BackgroundJob *grab;
|
|
static boost::mutex mutex;
|
|
static void thr();
|
|
volatile State state;
|
|
};
|