Re: C coroutines in ANSI C

[Wim Couwenberg <wcou@...>]

Hi David,

what a coincidence!  I was just playing with this exact fiber idea on 
Win32.  Currently I'm just testing a first version.  I was planning to 
post about it later but since you brought this up I'll provide my 
implementation a bit early.  (It does not check thouroughly enough for 
all kinds of error conditions so be careful.)

My 'fiber' library is written for Win32 and Lua 5.0.2.  It copies the 
coroutine semantics:

    fiber.create(a_start_func)
    fiber.resume(a_fiber [, args])
    fiber.yield([results])

At least it builds and the first tests seem to come out OK...  :-) 
Fibers should be resumable across C boundaries (the implementation does 
that already of course).

If a gc function yields we're into trouble though.  I don't suppose that 
a gc can run while another gc is still suspended without causing some 
major damage...

Each fiber currently allocates a stack of default size.  This could be 
tweaked if necessary.

Anyway, play around with it if you like!

Wim

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