"Lex Spoon" <lex at cc.gatech.edu> wrote:
[SNIP]
> Okay, Ian has patiently explained to me how the semaphore notification
> stuff is supposed to work, and it turns out that the SourceForge code is
> really a mess.  Basically, the following line in notify():
> 
> 	  int mask= pss->pendingEvents | eventMask;
> 
> would cause all events to be signalled that the image is interested in,
> whether the event has happened or not.  Changing the "|" to the proper
> "&" (duh!) causes many events *not* to be signalled.  This led to a
> cascade of changes to make sure that pendingEvents has all the flags it
> is supposed to, and that select() gets called on all the events listed
> in pendingEvents.  This is all posted on SourceForge now.

Super! I am rebuilding as we speak.

> Goran's example code works properly, Scamper works, and with any luck
> email sending works.  :)  Hopefully this is better on the whole, but
> there may well be new problems.  It's tricky stuff, and the code is less
> than clear.
> 
> The changes are posted on SourceForge.  I haven't looked at Ian's
> version, but there's a good chance that it has similar issues.

Yes - the "|" bug was in his original code. He sent a patch to the list
with the "|"->"&" change plus others. Did you check it?

> Lex Spoon

regards, Göran