mirror of https://github.com/tc39/test262.git
94 lines
2.6 KiB
JavaScript
94 lines
2.6 KiB
JavaScript
// Copyright (C) 2018 Amal Hussein. 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.wait
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description: >
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New waiters should be applied to the end of the list and woken by order they entered the list (FIFO)
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info: |
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Atomics.wait( typedArray, index, value, timeout )
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16.Perform AddWaiter(WL, W).
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...
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3.Add W to the end of the list of waiters in WL.
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includes: [atomicsHelper.js]
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features: [Atomics, SharedArrayBuffer, TypedArray]
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---*/
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var NUMAGENT = 3;
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var WAIT_INDEX = 0;
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var RUNNING = 1;
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var LOCK_INDEX = 2;
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for (var i = 0; i < NUMAGENT; i++) {
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var agentNum = 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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// Synchronize workers before reporting the initial report.
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while (Atomics.compareExchange(i32a, ${LOCK_INDEX}, 0, 1) !== 0) ;
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// Report the agent number before waiting.
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$262.agent.report(${agentNum});
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// Wait until restarted by main thread.
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var status = Atomics.wait(i32a, ${WAIT_INDEX}, 0);
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// Report wait status.
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$262.agent.report(status);
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// Report the agent number after waiting.
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$262.agent.report(${agentNum});
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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 * 4)
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);
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$262.agent.safeBroadcast(i32a);
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// Wait until all agents started.
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$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
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// Agents may be started in any order.
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const started = [];
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for (var i = 0; i < NUMAGENT; i++) {
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// Wait until an agent entered its critical section.
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$262.agent.waitUntil(i32a, LOCK_INDEX, 1);
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// Record the agent number.
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started.push($262.agent.getReport());
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// The agent may have been interrupted between reporting its initial report
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// and the `Atomics.wait` call. Try to yield control to ensure the agent
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// actually started to wait.
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$262.agent.tryYield();
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// Now continue with the next agent.
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Atomics.store(i32a, LOCK_INDEX, 0);
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}
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// Agents must notify in the order they waited.
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for (var i = 0; i < NUMAGENT; i++) {
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var woken = 0;
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while ((woken = Atomics.notify(i32a, WAIT_INDEX, 1)) === 0) ;
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assert.sameValue(woken, 1,
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'Atomics.notify(i32a, WAIT_INDEX, 1) returns 1, at index = ' + i);
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assert.sameValue($262.agent.getReport(), 'ok',
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'$262.agent.getReport() returns "ok", at index = ' + i);
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assert.sameValue($262.agent.getReport(), started[i],
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'$262.agent.getReport() returns the value of `started[' + i + ']`');
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}
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