Hi again, thanks for the code .. I am actually not trying to make a point - just trying to learn, and start a discussion that leads to learning. since the code below means nothing to me - thats probably a good place for me to start. Cheers, J On Nov 23, 2009, at 9:58 PM, Ernest N. Prabhakar, Ph.D. wrote:
Hi John,
On Nov 23, 2009, at 12:55 PM, John Shea wrote:
No I assume at some stage the ruby block has to be turned into a C block with associated scope - and from my limited knowledge on GCD that does not seem so easy.
Again, I think I'm still missing your point. In the context of GCD, this is a non-issue since you don't *have* to use C blocks. Instead, GCD provides a function pointer + context pointer API, which is what MacRuby uses:
http://github.com/masterkain/macruby/blob/master/gcd.c
if (RTEST(synchronous)){ dispatch_sync_f(RQueue(self)->queue, (void *)block, rb_queue_dispatcher); } else { dispatch_async_f(RQueue(self)->queue, (void *)block, rb_queue_dispatcher); }
That is, C just treats the Ruby block as a data pointer.
-- Ernie P.
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