Files
firefox/testing/web-platform/tests/workers/postMessage_block.https.html
Ingvar Stepanyan fa4a842068 Bug 1633475 [wpt PR 23270] - Test that postMessage doesn't block on event loop, a=testonly
Automatic update from web-platform-tests
Test that postMessage doesn't block on event loop

Per spec postMessage should queue a message up on the target port immediately.

Instead, when Workers are involved, some implementations queue a task up on current thread's event loop, which means that in case it gets blocked, some messages are never sent.

Closes https://github.com/whatwg/html/issues/5485.
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wpt-commits: 3320205a9d70636efc03cfff340edecd0bee4694
wpt-pr: 23270
2020-05-04 18:11:50 +00:00

19 lines
480 B
HTML

<!DOCTYPE html>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
const t = async_test('postMessage and block');
const w = new Worker('support/postMessage_block_worker.js');
w.onmessage = t.step_func_done(() => {
const a = new Int32Array(new SharedArrayBuffer(4));
w.postMessage(a);
while (Atomics.load(a, 0) === 0);
assert_equals(Atomics.load(a, 0), 1);
});
</script>
</body>