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<!DOCTYPE html>
<title>Test that calling "worker.postMessage()" will occur truly in parallel to the main JS thread performing other computation.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(t => {
return new Promise(resolve => {
let worker = new Worker("support/Worker-postMessage-happens-in-parallel.js");
worker.postMessage('init');
worker.onmessage = () => {
let sab = new Uint8Array(new SharedArrayBuffer(16));
worker.postMessage(sab);
let end = performance.now() + 30*1000;
while(sab[0] != 1 && performance.now() < end) /*wait to join with the result*/;
assert_true(sab[0] == 1);
resolve();
};
});
}, 'Tests that calling "worker.postMessage()" will occur truly in parallel to the main JS thread');
</script>
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