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Code Issues Releases Activity

slightly safer record usage of compiler hack

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This commit is contained in:
Eliot Horowitz 2011-07-15 17:58:29 -04:00
parent 0ed5ef7b06
commit d71afc52d7
1 changed files with 5 additions and 2 deletions
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7
db/record.cpp
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@ -180,14 +180,17 @@ namespace mongo {
bool Record::MemoryTrackingEnabled = true; bool Record::MemoryTrackingEnabled = true;
int __record_touch_dummy = 1; // this is used to make sure the compiler doesn't get too smart on us volatile int __record_touch_dummy = 1; // this is used to make sure the compiler doesn't get too smart on us
void Record::touch( bool entireRecrd ) { void Record::touch( bool entireRecrd ) {
if ( lengthWithHeaders > HeaderSize ) { // this also makes sure lengthWithHeaders is in memory if ( lengthWithHeaders > HeaderSize ) { // this also makes sure lengthWithHeaders is in memory
char * addr = data; char * addr = data;
char * end = data + netLength(); char * end = data + netLength();
for ( ; addr <= end ; addr += 2048 ) for ( ; addr <= end ; addr += 2048 ) {
__record_touch_dummy += addr[0]; __record_touch_dummy += addr[0];
if ( ! entireRecrd )
break;
}
} }
} }