mirror of https://github.com/tc39/test262.git
65 lines
1.9 KiB
JavaScript
65 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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includes: [atomicsHelper.js]
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features: [Atomics, SharedArrayBuffer, TypedArray]
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---*/
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const WAIT_INDEX = 0; // Agents wait here
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const RUNNING = 1; // Accounting of live agents here
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const WAKECOUNT = 1;
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const NUMAGENT = 3;
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const BUFFER_SIZE = 4;
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for (var i = 0; i < NUMAGENT; i++ ) {
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$262.agent.start(`
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$262.agent.receiveBroadcast(function(sab) {
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const i32a = new Int32Array(sab);
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Atomics.add(i32a, ${RUNNING}, 1);
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// Waiters that are not woken will time out eventually.
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$262.agent.report(Atomics.wait(i32a, ${WAIT_INDEX}, 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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const i32a = new Int32Array(
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new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * BUFFER_SIZE)
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);
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$262.agent.broadcast(i32a.buffer);
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// Wait for agents to be running.
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waitUntil(i32a, 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(10);
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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(
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Atomics.wake(i32a, 0, WAKECOUNT),
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WAKECOUNT,
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'Atomics.wake(i32a, 0, WAKECOUNT) equals the value of `WAKECOUNT` (1)'
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);
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// Collect and check results
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const rs = [];
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for (var i = 0; i < NUMAGENT; i++) {
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rs.push(getReport());
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}
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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', 'The value of rs[i] is "ok"');
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}
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for (var i = WAKECOUNT; i < NUMAGENT; i++) {
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assert.sameValue(rs[i], 'timed-out', 'The value of rs[i] is "timed-out"');
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}
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