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> 010:  map_file $mmap, $file, '+<';
> 011:   if (!defined($mmap)) { print "ERROR!!\n"; }
> 012:         for(my $i=0;$i<10000;++$i) { $mmap = $i; sync($mmap,1);
+ }
> 013:  unmap ($mmap);

map_file $mmap, $file, '+<';
if (!defined($mmap)) { print "ERROR!!\n";}
...
   sync($mmap,1);
}
unmap ($mmap);