Re: [boost] condition Win32 based on events

12 Sep 2005


      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