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Re: Coroutines
Dustin Laurence <dustin@laurences.net> writes:
> I'm pretty sure this is stepping into deep quicksand, but I'll ask
> anyway...I'm interested in writing an FE for a language that has
> stackable coroutines (Lua-style, where you can yield and resume
> arbitrarily far down the call stack). I'm trying to wrap my head around
> what would be involve and how awful it would be.
>
> There are a few "coroutines in C" packages packages laying around, but
> they don't seem to be stackable (I'm sure the ones based on Duff's
> device aren't). Since you can't switch call stacks from C I think what
> I want is impossible at that level.
You might want to look at the SUS functions
getcontext/setcontext/makecontext/swapcontext. They allow you to
switch call stacks in C, although maybe not quite in the way you were
hoping. However, they're obsolescent; SUS suggests using threads
instead.