[mercury-users] Mercury runtime problem on Windows

Paul Bone pbone at csse.unimelb.edu.au
Thu Aug 13 16:31:08 AEST 2009

On Thu, Aug 13, 2009 at 02:38:34PM +1000, Michael Day wrote:
> Hi Paul,
>> This should not happen, each process should have it's own set of handlers
>> independant of any other process.  I think this would be an implementation
>> problem in Windows.
> That would be annoying. Is there some way to workaround this in the  
> Mercury runtime? Perhaps try the call again if it fails?
> Alternatively, what happens if the segfault handler is not installed?
> Is it necessary for garbage collection, or only the detection of  
> catastrophic failures? From our perspective, this *is* a catastrophic  
> failure, so we would rather proceed without it than abort if possible.

AIUI this is for the detection and slightly-more-graceful handling of memory
access errors.  In some places in the runtime we use mprotect() to ensure that
reads or writes to that memory are caught as errors, I forget exactly what this
is for but perhaps to catch stack overruns, this may be related to our SIGSERV

That's a good point.  I'd recommend writing a C program that trys to install
signal handlers and spawning multiple copies of that program to see if this
problem occurs is independently of Mercury.

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