Re: C coroutines in ANSI C
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- Subject: Re: C coroutines in ANSI C
- From: Dave Dodge <dododge@...>
- Date: Thu, 4 Aug 2005 04:42:44 -0400
On Wed, Aug 03, 2005 at 11:56:30AM -0300, Silvana Rossetto wrote:
> Yet another coroutine library in ANSI-C is Portable Coroutine Library(PCL),
> written by Davide Libenzi. It seems nice!
>
> http://xmailserver.org/libpcl.html
I'm not sure this is pure ANSI C. The stack/context switching is the
tricky part since C doesn't really have a portable way of doing that.
Looking at the "co_set_context" function in "pcl.c". It appears to
include:
- a POSIX sigcontext implementation.
- a ucontext implementation.
- a setjmp/longjmp implementation, but that requires the
ability to directly manipulate the contents of the jmp_buf
data (which I believe ANSI considers off-limits). It has
a bunch of #if statements to test for known GLIBC and WIN32
C libraries in order to make this work.
So a non-POSIX non-Windows system might not be able to run this code.
-Dave Dodge