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// @file pagefault.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/>.
*/
#include "mongo/pch.h"
#include "mongo/db/pagefault.h"
#include "mongo/db/client.h"
#include "mongo/db/diskloc.h"
#include "mongo/db/pdfile.h"
#include "mongo/server.h"
namespace mongo {
PageFaultException::PageFaultException(const Record *_r)
{
verify( cc().allowedToThrowPageFaultException() );
cc().getPageFaultRetryableSection()->didLap();
r = _r;
era = LockMongoFilesShared::getEra();
LOG(2) << "PageFaultException thrown" << endl;
}
void PageFaultException::touch() {
if ( Lock::isLocked() ) {
warning() << "PageFaultException::touch happening with a lock" << endl;
}
LockMongoFilesShared lk;
if( LockMongoFilesShared::getEra() != era ) {
// files opened and closed. we don't try to handle but just bail out; this is much simpler
// and less error prone and saves us from taking a dbmutex readlock.
MONGO_DLOG(2) << "era changed" << endl;
return;
}
r->touch();
}
PageFaultRetryableSection::~PageFaultRetryableSection() {
cc()._pageFaultRetryableSection = 0;
}
PageFaultRetryableSection::PageFaultRetryableSection() {
_laps = 0;
verify( cc()._pageFaultRetryableSection == 0 );
if( Lock::isLocked() ) {
cc()._pageFaultRetryableSection = 0;
if( debug || logger::globalLogDomain()->shouldLog(logger::LogSeverity::Debug(3)) ) {
LOGSOME << "info PageFaultRetryableSection will not yield, already locked upon reaching" << endl;
}
}
else {
cc()._pageFaultRetryableSection = this;
cc()._hasWrittenThisPass = false;
}
}
NoPageFaultsAllowed::NoPageFaultsAllowed() {
_saved = cc()._pageFaultRetryableSection;
cc()._pageFaultRetryableSection = 0;
}
NoPageFaultsAllowed::~NoPageFaultsAllowed() {
cc()._pageFaultRetryableSection = _saved;
}
}
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