My program uses CreateFileMapping so multiple processes can access a common data base. The program runs fine and produces the correct answers. But when all is finished, sometimes the Windows OS has crashed. Other programs won't load, and
the Power | Restart button doesn't work. I have to run shutdown.exe and then cold start the PC.
I UnmapViewOffile for each mapping I create, and then close the handle. Here is the code. Did I leave out anything?
#pragma optimize("g", off )
// core 0 comes here to get addresses of arrays for other cores
void preparederivmap( int &npas ) // create mapping of data for other cores
{
int size = 15001*412 + 128;
TCHAR derivfilename[]= TEXT("SYNOPSYS_DERIV_DATA");
hMapping = CreateFileMapping( NULL ,nullptr, PAGE_READWRITE, 0, (size*sizeof(double)), derivfilename );
if (hMapping == NULL ) {
panic( "Cannot open mapping file" );
}
double *deriv = static_cast<double*> (MapViewOfFile(hMapping, FILE_MAP_ALL_ACCESS, 0, 0, 0 ));
if ( !deriv ) {
panic( "Cannot do MapView" );
}
pderiv = deriv;
size = 401;
TCHAR delqfilename[]= TEXT("SYNOPSYS_DELQ_DATA");
hMapping2 = CreateFileMapping( NULL ,nullptr, PAGE_READWRITE, 0, (size*sizeof(double)), delqfilename );
if (hMapping2 == NULL ) {
panic( "Cannot open mapping file" );
}
double *delq = static_cast<double*> (MapViewOfFile(hMapping2, FILE_MAP_ALL_ACCESS, 0, 0, 0 ));
if ( !delq ) {
panic( "Cannot do MapView" );
}
pdelq = delq;
TCHAR scdrfilename[]= TEXT("SYNOPSYS_SCDR_DATA");
hMapping3 = CreateFileMapping( NULL ,nullptr, PAGE_READWRITE, 0, (size*sizeof(double)), scdrfilename );
if (hMapping3 == NULL ) {
panic( "Cannot open mapping file" );
}
double *scdr = static_cast<double*> (MapViewOfFile(hMapping3, FILE_MAP_ALL_ACCESS, 0, 0, 0 ));
if ( !scdr ) {
panic( "Cannot do MapView" );
}
pscdr = scdr;
SYNORUN( deriv, delq, scdr, &npas ); // returns only when all passes are done
return;
}
void killderivmap( ) // delete mapping of data for other cores
{
UnmapViewOfFile( pderiv );
UnmapViewOfFile( pdelq );
UnmapViewOfFile( pscdr );
CloseHandle( hMapping );
CloseHandle( hMapping2 );
CloseHandle( hMapping3 );
}
