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// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-atomics.wake
description: >
Test that Atomics.wake wakes one waiter if that's what the count is.
---*/
var NUMAGENT = 3;
var WAKEUP = 0; // Agents wait here
var RUNNING = 1; // Accounting of live agents here
var NUMELEM = 2;
var WAKECOUNT = 1;
for (var i = 0; i < NUMAGENT; i++) {
$262.agent.start(
`
$262.agent.receiveBroadcast(function (sab) {
var ia = new Int32Array(sab);
Atomics.add(ia, ${RUNNING}, 1);
// Waiters that are not woken will time out eventually.
$262.agent.report(Atomics.wait(ia, ${WAKEUP}, 0, 2000));
$262.agent.leaving();
})
`);
}
var ia = new Int32Array(new SharedArrayBuffer(NUMELEM * Int32Array.BYTES_PER_ELEMENT));
$262.agent.broadcast(ia.buffer);
// Wait for agents to be running.
waitUntil(ia, RUNNING, NUMAGENT);
// Then wait some more to give the agents a fair chance to wait. If we don't,
// we risk sending the wakeup before agents are sleeping, and we hang.
$262.agent.sleep(500);
// There's a slight risk we'll fail to wake the desired count, if the preceding
// sleep() took much longer than anticipated and workers have started timing
// out.
assert.sameValue(Atomics.wake(ia, 0, WAKECOUNT), WAKECOUNT);
// Collect and check results
var rs = [];
for (var i = 0; i < NUMAGENT; i++)
rs.push(getReport());
rs.sort();
for (var i = 0; i < WAKECOUNT; i++)
assert.sameValue(rs[i], "ok");
for (var i = WAKECOUNT; i < NUMAGENT; i++)
assert.sameValue(rs[i], "timed-out");
function getReport() {
var r;
while ((r = $262.agent.getReport()) == null)
$262.agent.sleep(100);
return r;
}
function waitUntil(ia, k, value) {
var i = 0;
while (Atomics.load(ia, k) !== value && i < 15) {
$262.agent.sleep(100);
i++;
}
assert.sameValue(Atomics.load(ia, k), value, "All agents are running");
}
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