From: Berke Durak <berke@altern.org>
To: caml-list@inria.fr
Subject: [Caml-list] Graphics.wait_next_event () blocks other threads
Date: Wed, 4 Sep 2002 22:45:31 +0200 [thread overview]
Message-ID: <20020904204531.GC303@gogol> (raw)
Native threads pose serious problems ; since Graphics.wait_next_event does
a simple select (), the bytecode version doesn't work either. So, my original
problem of writing a simple Tetris in Ocaml remains open !
The following code, compiled with
ocamlc -thread unix.cma threads.cma graphics.cma toto.ml -o toto,
should, ideally, on one side, write "alpha 1","alpha 2", etc. to stdout
while still reading keys from the graphics window. This does not
happen.
--[begin code]--
open Thread
open Graphics
let _ =
open_graph " 300x300";
let code1 () =
let x = ref 0 in
while true do
incr x;
Printf.printf "alpha %d\n" !x;
flush stdout;
Thread.yield ()
done
in
let code2 () =
while true do
let st = wait_next_event [Key_pressed] in
Printf.printf "key %c pressed...\n" st.key;
flush stdout;
Thread.yield ()
done
in
let thread1 = Thread.create code1 ()
and thread2 = Thread.create code2 ()
in
while true do
Thread.yield ()
done
--[end code]--
This means that :
1) The graphics module needs to be updated
2) Native threads should be fixed
or
1) A Timeout event type should be added to the Graphics module.
--
Berke Durak
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