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//background.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pch.h"
#include "goodies.h"
#include "background.h"
#include <list>
namespace mongo {
BackgroundJob *BackgroundJob::grab = 0;
mongo::mutex BackgroundJob::mutex("BackgroundJob");
/* static */
void BackgroundJob::thr() {
assert( grab );
BackgroundJob *us = grab;
assert( us->state == NotStarted );
us->state = Running;
grab = 0;
{
string nm = us->name();
setThreadName(nm.c_str());
}
try {
us->run();
}
catch ( std::exception& e ){
log( LL_ERROR ) << "backgroundjob error: " << e.what() << endl;
}
catch(...) {
log( LL_ERROR ) << "uncaught exception in BackgroundJob" << endl;
}
us->state = Done;
bool delSelf = us->deleteSelf;
us->ending();
if( delSelf )
delete us;
}
BackgroundJob& BackgroundJob::go() {
scoped_lock bl(mutex);
assert( grab == 0 );
grab = this;
boost::thread t(thr);
while ( grab )
sleepmillis(2);
return *this;
}
bool BackgroundJob::wait(int msMax, unsigned maxsleep) {
assert( state != NotStarted );
unsigned ms = 0;
Date_t start = jsTime();
while ( state != Done ) {
sleepmillis(ms);
if( ms*2<maxsleep ) ms*=2;
if ( msMax && ( int( jsTime() - start ) > msMax) )
return false;
}
return true;
}
void BackgroundJob::go(list<BackgroundJob*>& L) {
for( list<BackgroundJob*>::iterator i = L.begin(); i != L.end(); i++ )
(*i)->go();
}
/* wait for several jobs to finish. */
void BackgroundJob::wait(list<BackgroundJob*>& L, unsigned maxsleep) {
unsigned ms = 0;
{
x:
sleepmillis(ms);
if( ms*2<maxsleep ) ms*=2;
for( list<BackgroundJob*>::iterator i = L.begin(); i != L.end(); i++ ) {
assert( (*i)->state != NotStarted );
if( (*i)->state != Done )
goto x;
}
}
}
void PeriodicBackgroundJob::run(){
// want to handle first one differently so inShutdown is obeyed nicely
sleepmillis( _millis );
while ( ! inShutdown() ){
try {
runLoop();
}
catch ( std::exception& e ){
log( LL_ERROR ) << "PeriodicBackgroundJob [" << name() << "] error: " << e.what() << endl;
}
catch ( ... ){
log( LL_ERROR ) << "PeriodicBackgroundJob [" << name() << "] unknown error" << endl;
}
sleepmillis( _millis );
}
}
} // namespace mongo
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