mirror of https://github.com/tc39/test262.git
73 lines
1.9 KiB
JavaScript
73 lines
1.9 KiB
JavaScript
// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-atomics.wake
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description: >
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Test that Atomics.wake wakes one waiter if that's what the count is.
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features: [Atomics]
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---*/
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var NUMAGENT = 3;
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var WAKEUP = 0; // Agents wait here
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var RUNNING = 1; // Accounting of live agents here
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var NUMELEM = 2;
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var WAKECOUNT = 1;
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for ( var i=0 ; i < NUMAGENT ; i++ ) {
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$262.agent.start(
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`
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$262.agent.receiveBroadcast(function (sab) {
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var ia = new Int32Array(sab);
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Atomics.add(ia, ${RUNNING}, 1);
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// Waiters that are not woken will time out eventually.
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$262.agent.report(Atomics.wait(ia, ${WAKEUP}, 0, 2000));
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$262.agent.leaving();
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})
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`);
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}
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var ia = new Int32Array(new SharedArrayBuffer(NUMELEM * Int32Array.BYTES_PER_ELEMENT));
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$262.agent.broadcast(ia.buffer);
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// Wait for agents to be running.
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waitUntil(ia, RUNNING, NUMAGENT);
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// Then wait some more to give the agents a fair chance to wait. If we don't,
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// we risk sending the wakeup before agents are sleeping, and we hang.
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$262.agent.sleep(500);
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// There's a slight risk we'll fail to wake the desired count, if the preceding
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// sleep() took much longer than anticipated and workers have started timing
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// out.
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assert.sameValue(Atomics.wake(ia, 0, WAKECOUNT), WAKECOUNT);
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// Collect and check results
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var rs = [];
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for (var i = 0; i < NUMAGENT; i++)
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rs.push(getReport());
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rs.sort();
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for (var i = 0; i < WAKECOUNT; i++)
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assert.sameValue(rs[i], "ok");
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for (var i = WAKECOUNT; i < NUMAGENT; i++)
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assert.sameValue(rs[i], "timed-out");
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function getReport() {
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var r;
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while ((r = $262.agent.getReport()) == null)
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$262.agent.sleep(100);
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return r;
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}
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function waitUntil(ia, k, value) {
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var i = 0;
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while (Atomics.load(ia, k) !== value && i < 15) {
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$262.agent.sleep(100);
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i++;
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}
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assert.sameValue(Atomics.load(ia, k), value, "All agents are running");
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}
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