Re: [Chicken-hackers] PATCH: allow signal handlers to be called from any thread.

[Jörg F . Wittenberger]

Wait, this patch has a bug.  Sorry.

Am 30.11.2015 um 12:44 schrieb Jörg F. Wittenberger:
> Am 29.11.2015 um 17:55 schrieb Jörg F. Wittenberger:
>> Am 26.11.2015 um 11:29 schrieb Jörg F. Wittenberger:
>> The signal handler in the other thread will happily set the global
>> variable C_stack_limit to point 1000 word off the stack pointer at the
>> other thread.
> 
> Perhaps the attached patch is the smallest to avoid both the problems: a
> increasing leak on C_stack_limit if the signals arrive at the chicken
> thread before being handled and the confusion caused when signals are
> dispatched to another threads.
> 
> Does two things:
> 
> a) Don't overwrite saved_stack_limit multiple times.
> 
> b) Use a known global value `stack_bottom` as the temporary value for
> C_stack_limit to trigger garbage collection and interrupt dispatch.
> 
> Best
> 
> /Jörg
> 
> 
> 
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