mirror of https://github.com/tc39/test262.git
80 lines
2.1 KiB
JavaScript
80 lines
2.1 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.notify
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description: >
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Test that Atomics.notify notifies agents in the order they are waiting.
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includes: [atomicsHelper.js]
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features: [Atomics, SharedArrayBuffer, TypedArray]
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---*/
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const NUMAGENT = 3;
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const WAIT_INDEX = 0; // Waiters on this will be woken
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const SPIN = 1; // Worker i (zero-based) spins on location SPIN+i
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const RUNNING = SPIN + NUMAGENT; // Accounting of live agents
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const BUFFER_SIZE = RUNNING + 1;
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// Create workers and start them all spinning. We set atomic slots to make
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// them go into a wait, thus controlling the waiting order. Then we notify them
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// one by one and observe the notification order.
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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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while (Atomics.load(i32a, ${SPIN + i}) === 0) {
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/* nothing */
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}
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$262.agent.report(${i});
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Atomics.wait(i32a, ${WAIT_INDEX}, 0);
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$262.agent.report(${i});
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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.safeBroadcast(i32a);
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// Wait for agents to be running.
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$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
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var waiterlist = [];
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for (var i = 0; i < NUMAGENT; i++) {
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assert.sameValue(
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Atomics.store(i32a, SPIN + i, 1),
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1,
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`Atomics.store(i32a, SPIN + ${i}, 1) returns 1`
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);
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waiterlist.push($262.agent.getReport());
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// Try to yield control to ensure the agent actually started to wait.
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$262.agent.tryYield();
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}
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var notified = [];
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for (var i = 0; i < NUMAGENT; i++) {
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assert.sameValue(
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Atomics.notify(i32a, WAIT_INDEX, 1),
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1,
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`Atomics.notify(i32a, WAIT_INDEX, 1) returns 1 (${i})`
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);
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notified.push($262.agent.getReport());
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}
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assert.sameValue(
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notified.join(''),
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waiterlist.join(''),
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'notified.join(\'\') returns waiterlist.join(\'\')'
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);
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