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// @file pagefault.cpp
#include "pch.h"
#include "diskloc.h"
#include "pagefault.h"
#include "client.h"
#include "pdfile.h"
#include "server.h"
namespace mongo {
PageFaultException::PageFaultException(Record *_r)
{
assert( cc()._pageFaultRetryableSection != 0 );
cc()._pageFaultRetryableSection->_laps++;
assert( cc()._pageFaultRetryableSection->_laps < 1000 );
r = _r;
era = LockMongoFilesShared::getEra();
}
void PageFaultException::touch() {
assert( !d.dbMutex.atLeastReadLocked() );
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.
dlog(2) << "era changed" << endl;
return;
}
r->touch();
}
PageFaultRetryableSection::~PageFaultRetryableSection() {
cc()._pageFaultRetryableSection = old;
}
PageFaultRetryableSection::PageFaultRetryableSection() {
_laps = 0;
old = cc()._pageFaultRetryableSection;
if( d.dbMutex.atLeastReadLocked() ) {
cc()._pageFaultRetryableSection = 0;
if( debug || logLevel > 2 ) {
LOGSOME << "info PageFaultRetryableSection will not yield, already locked upon reaching" << endl;
}
}
else if( cc()._pageFaultRetryableSection ) {
cc()._pageFaultRetryableSection = 0;
dlog(2) << "info nested PageFaultRetryableSection will not yield on fault" << endl;
}
else {
cc()._pageFaultRetryableSection = this;
cc()._hasWrittenThisPass = false;
}
}
}
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