Re: [boost] condition Win32 based on events

From: Roland Schwarz (roland.schwarz_at_[hidden])
Date: 2005-09-12 00:59:49

Roland Schwarz schrieb:

<snip>
I found a small bug in my implementation. The --cv->waiters_ is unprotected.
Change this to to use InterlockedDecrement(&cv->waiters_) instead.

>    switch(WaitForMultipleObjects(
>        2, cv->events_,FALSE,INFINITE)) {
>        // on unblocking of the thread the gate is closed
>        case WAIT_OBJECT_0+SIGNAL:
>            InterlockedDecrement(&cv->waiters_); // one is leaving
>            ReleaseSemaphore(cv->gate_,1,NULL);//reopen
>            // no need to reset event, it is automatic
>            break;
>        case WAIT_OBJECT_0+BROADCAST:
>            if (0 == IntelockedDecrement(&cv->waiters_)) {
>                ResetEvent(
>                    cv->events_[BROADCAST]);
>                 // last leaving, reopen the gate
>                ReleaseSemaphore(cv->gate_,1,NULL);
>            }
>            break;
>    }
>  
>
Regards,
Roland