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e4883091b9
Migrating all tests to this API is necessary to prevent tests from hanging indefinitely when a SAB is sent to a worker but the code in the worker attempts to create a non-sharable TypedArray (something that is not Int32Array or BigInt64Array). When that scenario occurs, an exception is thrown and the agent worker can no longer communicate with any other threads that control the SAB. If the main thread happens to be spinning in the $262.agent.waitUntil() while loop, it will never meet its termination condition and the test will hang indefinitely. Because we've defined $262.agent.broadcast(SAB) in https://github.com/tc39/test262/blob/master/INTERPRETING.md, there are host implementations that assume compatibility, which must be maintained.
60 lines
1.5 KiB
JavaScript
60 lines
1.5 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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Returns "not-equal" when value arg does not match an index in the typedArray
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info: |
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Atomics.wait( typedArray, index, value, timeout )
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3.Let v be ? ToInt32(value).
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...
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14.If v is not equal to w, then
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a.Perform LeaveCriticalSection(WL).
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b. Return the String "not-equal".
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includes: [atomicsHelper.js]
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features: [Atomics, SharedArrayBuffer, TypedArray]
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---*/
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const RUNNING = 1;
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var value = 42;
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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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$262.agent.report(Atomics.store(i32a, 0, ${value}));
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$262.agent.report(Atomics.wait(i32a, 0, 0));
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$262.agent.leaving();
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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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// NB: We don't actually explicitly need to wait for the agent to start in this
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// test case, we only do it for consistency with other test cases which do
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// require the main agent to wait and yield control.
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$262.agent.safeBroadcast(i32a);
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$262.agent.waitUntil(i32a, RUNNING, 1);
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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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assert.sameValue(
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$262.agent.getReport(),
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value.toString(),
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'$262.agent.getReport() returns value.toString()'
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);
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assert.sameValue(
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$262.agent.getReport(),
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'not-equal',
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'$262.agent.getReport() returns "not-equal"'
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);
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