[MacRuby-devel] [MacRuby] #447: GCD Crashes
John Shea
johnmacshea at gmail.com
Mon Nov 23 13:29:40 PST 2009
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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