Graeme Geldenhuys schrieb: > Hi, > > The current TMultiReadExclusiveWriteSynchronizer as implemented in FPC > 2.3.1 is wrong. It use Critical Sections in a standard way which means > it blocks all other threads while one thread is doing a Read. This is > wrong. It is a MULTI read, SINGLE write synchronizer. So it must only > block other thread is a Write is in progress. But allow multiple reads > while no Write is in progress.
It is on the safe side but it is not optimal. > > The TMultiReadExclusiveWriteSynchronizer is currently equivalent to the > Delphi 7 TSimpleRWSync class, not the Delphi > TMultiReadExclusiveWriteSynchronizer class. > > > I have a corrected TMultiReadExclusiveWriteSynchronizer implementation > (don't worry, not based on Delphi implementation) that I can donate to > FPC. I just need confirmation that the current implementation in FPC is > incorrect though. If you have a better for unix this will be fine. IIRC it is not easy (if possible after all?) to implement TMultiReadExclusiveWriteSynchronizer for unix systems. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
