Am 03.07.2014 17:34, schrieb Daniel Leslie:
Unless I missed a radical change in Chicken, its SRFI-18 threads are
green threads and not real system threads. As a result, blocking
operations will block all threads and no real gain is had from the
hardware's support for multithreading.
Because of those issues I suggest avoiding SRFI-18 threads altogether.
They aren't worth the hassle.
-Dan
Depends... If your job is to manage a lot of network i/o or other
asynchronous events, what would you do without SRFI-18? Probably write
your own event loop. That would be equivalent to green threads in turn.
Having said that let me add a note about my personal taste: I'm using a
wrapper over SRFI-18 (which could be implemented without SRFI-18) to
provide a more Schemish API to threads. Like:
(!map <proc> <list>)
(!apply <proc> <list>)
Which would do the same thing as "map" and "apply", just returning a
promise to the result and apply <proc> in parallel to the calling thread
and (in case of !map) in parallel to all elements in the list.
So yes, SRFI-18 is kind of a hassle. But green threads retain their
purpose.
On 3 Jul 2014 04:13, "Kristian Lein-Mathisen" <[email protected]
<mailto:[email protected]>> wrote:
That is strange, I've experienced alex's problem too - having to
yield a little to give the REPL some room.
Anyhow, for others who might come across this thread: alex's idea
works great, but you need to be careful with blocking IO on your
REPL. If you don't use parley <http://api.call-cc.org/doc/parley>
or something similar, chances are that your REPL srfi-18-thread
will block your srfi-18-game-thread while it's waiting for IO.
K.
On Wed, Jul 2, 2014 at 9:07 PM, John Cowan <[email protected]
<mailto:[email protected]>> wrote:
alex scripsit:
> I had some trouble with this last part at first: the
original thread
> waited several seconds before evaluating my input. I think
that the
> fix was nothing more than calling thread-yield! every loop
> iteration.
If you are depending on thread-yield! for correctness rather than
efficiency, you are doing something wrong (but I don't know what).
SRFI 18 schedulers are not required to be fair in any way.
--
John Cowan http://www.ccil.org/~cowan
<http://www.ccil.org/%7Ecowan> [email protected]
<mailto:[email protected]>
He that would foil me must use such weapons as I do, for I
have not
fed my readers with straw, neither will I be confuted with
stubble.
--Thomas Vaughan (1650)
_______________________________________________
Chicken-users mailing list
[email protected] <mailto:[email protected]>
https://lists.nongnu.org/mailman/listinfo/chicken-users
_______________________________________________
Chicken-users mailing list
[email protected] <mailto:[email protected]>
https://lists.nongnu.org/mailman/listinfo/chicken-users
_______________________________________________
Chicken-users mailing list
[email protected]
https://lists.nongnu.org/mailman/listinfo/chicken-users
_______________________________________________
Chicken-users mailing list
[email protected]
https://lists.nongnu.org/mailman/listinfo/chicken-users
