[mercury-users] Registering memory deallocation functions

Peter Ross pro at missioncriticalit.com
Thu Aug 25 18:08:34 AEST 2005

On Thu, Aug 25, 2005 at 12:49:30PM +1000, Peter Hawkins wrote:
> Hi...
> Kral Stefan wrote:
> >Do you have any ideas or hints how to register a function 
> >that should be called when the GC frees an object of
> >a particular type (say, a GMP integer or float)?
> > 
> >
> Yes. You can register finalizers with the Boehm garbage collector that 
> get called when an object gets garbage collected. You need to use the 
> GC_register_finalizer function.
> eg.:
> pointer = GC_MALLOC(sizeof(athing));
> GC_register_finalizer(pointer, thing_finalizer, 0, 0, 0);
You can see an example of this code in extras/concurrency/semaphore.m
in the predicate semaphore__new where we need to call a pthread
deallocation routine when the semaphore is no longer needed.

Note the wrapping with #define so that the routine is only called when
compiled in a grade using the boehm gc system.
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