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

[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

0001-allowsignalhandlerstobecalledfromanythread.patch
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