mirror of https://github.com/tc39/test262.git
73 lines
2.1 KiB
JavaScript
73 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.wake
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description: >
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Test that Atomics.wake wakes agents in the order they are waiting.
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features: [Atomics]
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---*/
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var NUMAGENT = 3;
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var WAKEUP = 0; // Waiters on this will be woken
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var SPIN = 1; // Worker i (zero-based) spins on location SPIN+i
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var RUNNING = SPIN + NUMAGENT; // Accounting of live agents
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var NUMELEM = 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 wake them
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// one by one and observe the wakeup order.
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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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while (Atomics.load(ia, ${SPIN + i}) === 0)
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/* nothing */ ;
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$262.agent.report(${i} + Atomics.wait(ia, ${WAKEUP}, 0));
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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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// Make them sleep in order 0 1 2 on ia[0]
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for (var i = 0; i < NUMAGENT; i++) {
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Atomics.store(ia, SPIN + i, 1);
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$262.agent.sleep(500);
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}
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// Wake them up one at a time and check the order is 0 1 2
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for (var i = 0; i < NUMAGENT; i++) {
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assert.sameValue(Atomics.wake(ia, WAKEUP, 1), 1);
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assert.sameValue(getReport(), i + "ok");
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}
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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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