view tests/spawn.ur @ 1893:9a1097954188

compileC: Link libraries in the right order This is needed, at least on recent Ubuntu, to fix this linker error when compiling any Ur/Web application: ld: /tmp/webapp.o: undefined reference to symbol 'uw_write' Signed-off-by: Anders Kaseorg <andersk@mit.edu> --- src/compiler.sml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
author Anders Kaseorg <andersk@mit.edu>
date Thu, 21 Nov 2013 14:32:11 -0500
parents 7ea0df9e56b6
children
line wrap: on
line source
table t : {A : int, Ch : channel string}

fun listener n ch =
    s <- recv ch;
    alert (show n ^ ": " ^ s);
    listener n ch

fun speak id msg =
    r <- oneRow (SELECT t.Ch FROM t WHERE t.A = {[id]});
    send r.T.Ch msg

fun main () : transaction page =
    ch1 <- channel;
    dml (INSERT INTO t (A, Ch) VALUES (1, {[ch1]}));
    ch2 <- channel;
    dml (INSERT INTO t (A, Ch) VALUES (2, {[ch2]}));

    s1 <- source "";
    s2 <- source "";

    return <xml><body onload={spawn (listener 1 ch1); spawn (listener 2 ch2)}>
      1: <ctextbox source={s1}/><button onclick={msg <- get s1; speak 1 msg}/><br/>
      2: <ctextbox source={s2}/><button onclick={msg <- get s2; speak 2 msg}/>
    </body></xml>