Re: [Chicken-users] Exception when threads are deadlocked?

[Felix Winkelmann]

On Thu, 05 Aug 2004 14:35:12 +0200, Thomas Chust <address@hidden> wrote:

> Hello!
>
> I am doing some network communication in a chicken program and I'm using  
> the srfi-18 unit. In a certain case when a network connection dies  
> unexpectedly, a thread waiting for a condition-variable to be signalled  
> may become deadlocked.
> Apparently the chicken thread scheduler is quite smart and detects this  
> condition resulting in a warning beeing printed to the screen -- but is  
> there any way to catch that condition in my program and take some action  
> upon it? Is there a special exception type for this condition?

You can catch the exception in the thread that causes the deadlock
(via `handle-exceptions' or `condition-case'). For example:

(define m (make-mutex))
(mutex-lock! m)
(handle-exceptions ex (print "ugh.") (mutex-lock! m))

[I'm not sure whether this is SRFI-18 compliant, but I just wanted
to show handling exceptions]


cheers,
felix