[fpc-pascal] Semaphore problems

Vinzent Höfler JeLlyFish.software at gmx.net
Mon Jul 24 19:22:50 CEST 2006

Burkhard Carstens wrote:
> Am Montag, 24. Juli 2006 17:27 schrieb Vinzent Hoefler:
>>> - the rtlEvent works even with timeout (with my patch posted on
>>> mantis), but this one clears the signaled state, when wait is
>>> called.
>> *oh* Before the wait? That's not good. This cries for race conditions
>> and subtle deadlock situations.
> thread synchronization uses this and takes care of it by calling 
> RTLeventstartwait which locks the associated mutex.

As far as I just read code and comments, it does it for Windows to get 
Unix behaviour, although I don't see the point here, because this just 
forces the race condition the POSIX-Threads implementation actually 
tries to circumvent with this associated mutex.

I'm not even sure, if Unix actually clears the event. The man-pages 
don't seem to indicate so.


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