good-views.js - mozsearch

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// |reftest| skip-if(!this.hasOwnProperty('Atomics')) -- Atomics is not enabled unconditionally

// Copyright (C) 2017 Mozilla Corporation.  All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

esid: sec-atomics.wait

description: >

  Test Atomics.wait on arrays that allow atomic operations,

  in an Agent that is allowed to wait.

includes: [atomicsHelper.js]

features: [Atomics]

---*/

// Let's assume 'wait' is not allowed on the main thread,

// even in the shell.

$262.agent.start(`

  var sab = new SharedArrayBuffer(1024);

  var ab = new ArrayBuffer(16);

  var good_indices = [ (view) => 0/-1, // -0

                       (view) => '-0',

                       (view) => view.length - 1,

                       (view) => ({ valueOf: () => 0 }),

                       (view) => ({ toString: () => '0', valueOf: false }) // non-callable valueOf triggers invocation of toString

];

  var view = new Int32Array(sab, 32, 20);

  view[0] = 0;

  $262.agent.report("A " + Atomics.wait(view, 0, 0, 0))

  $262.agent.report("B " + Atomics.wait(view, 0, 37, 0));

  // In-bounds boundary cases for indexing

  for ( let IdxGen of good_indices ) {

      let Idx = IdxGen(view);

      view.fill(0);

      // Atomics.store() computes an index from Idx in the same way as other

      // Atomics operations, not quite like view[Idx].

      Atomics.store(view, Idx, 37);

      $262.agent.report("C " + Atomics.wait(view, Idx, 0));

  $262.agent.report("done");

  $262.agent.leaving();

`);

assert.sameValue(

  $262.agent.getReport(),

  'A timed-out',

  '$262.agent.getReport() returns "A timed-out"'

);

assert.sameValue(

  $262.agent.getReport(),

  'B not-equal',

  '$262.agent.getReport() returns "B not-equal"'

);

var r;

while ((r = $262.agent.getReport()) !== "done") {

  assert.sameValue(

r,

    'C not-equal',

    '$262.agent.getReport() returns "C not-equal"'

);

reportCompare(0, 0);