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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.
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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