Christer Palm wrote:
John Cupitt wrote:
Very simple and easy to program. I'm assuming writing 4 bytes to a
pipe is atomic, I guess. I've not had problems (even on SMP machines),
but it would be easy to add a global mutex for the pipe writers.
Oh, by the way. On a POSIX conformant system, a write to a pipe _is_
guaranteed to be atomic as long as it's no larger than PIPE_BUF (from
limits.h) bytes. So 4 bytes should be safe.
Just to point out one of the million possible solutions to this age
old problem ('cause I liked this solution alot when I heard of it, I have
to admit I haven't had the oportunity to try it myself since), you can
create your own GSource that pops off elements from a GAsyncQueue and
use that "source" in your recieving thread and in your publishing thread
you can push datum on to that queue and call `g_main_context_wakeup()'
on the recieving thread's context (ofcourse you can wrap that up in a pretty
little convinient api...).
I'm not sure exactly how much you gain in performance by using this
aproach, but I always though that using pipes to communicate between
threads is a kind of hack.
Cheers,
-Tristan
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