rust/src/test/run-pass/preempt.rs

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// xfail-stage0
// xfail-stage1
// xfail-stage2
// xfail-stage3
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// This checks that preemption works.
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fn starve_main(chan[int] alive) {
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log "signalling main";
alive <| 1;
log "starving main";
let int i = 0;
while (true) {
i += 1;
}
}
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fn main() {
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let port[int] alive = port();
log "main started";
let task s = spawn starve_main(chan(alive));
let int i;
log "main waiting for alive signal";
alive |> i;
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log "main got alive signal";
while (i < 50) {
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log "main iterated";
i += 1;
}
log "main completed";
}