Unwind-Protect and Jumping into the Abyss
R James Noble
kjx at comp.vuw.ac.nz
Thu Dec 17 03:23:28 UTC 1992
description of proposed _UnwindProtect: and _ContinueUnwind
> this primitive pair would probably cover
> most cases and would be relatively simple to implement as long as
> super-high performance is not the main goal.
Performance - this is _research_ :-). Any performance is preferable to
none, and I think these should do the trick. Presumably the
_ContinueUnwind call could be hidden in the Self wrapper for
>> "NLRs across process cause the process to terminate"
> Gee, I though nobody would ever discover this :-)
It was only a matter of time :-). Actually, I think the current
behaviour is quite sensible. It allows me to fake non-lifo blocks by
creating them then permantly suspending the process. But an NLR
causing another process to resume seems rather strange.
> We've been planning to put unwinf protect into the system for a while
As ever, this would make my life a lot easier.
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