| // Copyright (C) 2017 Mozilla Corporation. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-atomics.notify |
| description: > |
| Test that Atomics.notify notifies agents in the order they are waiting. |
| includes: [atomicsHelper.js] |
| features: [Atomics, SharedArrayBuffer, TypedArray] |
| ---*/ |
| |
| const NUMAGENT = 3; |
| const WAIT_INDEX = 0; // Waiters on this will be woken |
| const SPIN = 1; // Worker i (zero-based) spins on location SPIN+i |
| const RUNNING = SPIN + NUMAGENT; // Accounting of live agents |
| const BUFFER_SIZE = RUNNING + 1; |
| |
| // Create workers and start them all spinning. We set atomic slots to make |
| // them go into a wait, thus controlling the waiting order. Then we notify them |
| // one by one and observe the notification order. |
| |
| for (var i = 0; i < NUMAGENT; i++) { |
| $262.agent.start(` |
| $262.agent.receiveBroadcast(function(sab) { |
| const i32a = new Int32Array(sab); |
| Atomics.add(i32a, ${RUNNING}, 1); |
| |
| while (Atomics.load(i32a, ${SPIN + i}) === 0) { |
| /* nothing */ |
| } |
| |
| $262.agent.report(${i}); |
| Atomics.wait(i32a, ${WAIT_INDEX}, 0); |
| $262.agent.report(${i}); |
| |
| $262.agent.leaving(); |
| }); |
| `); |
| } |
| |
| const i32a = new Int32Array( |
| new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * BUFFER_SIZE) |
| ); |
| |
| $262.agent.safeBroadcast(i32a); |
| |
| // Wait for agents to be running. |
| $262.agent.waitUntil(i32a, RUNNING, NUMAGENT); |
| |
| var waiterlist = []; |
| for (var i = 0; i < NUMAGENT; i++) { |
| assert.sameValue( |
| Atomics.store(i32a, SPIN + i, 1), |
| 1, |
| `Atomics.store(i32a, SPIN + ${i}, 1) returns 1` |
| ); |
| |
| waiterlist.push($262.agent.getReport()); |
| |
| // Try to yield control to ensure the agent actually started to wait. |
| $262.agent.tryYield(); |
| } |
| |
| var notified = []; |
| for (var i = 0; i < NUMAGENT; i++) { |
| assert.sameValue( |
| Atomics.notify(i32a, WAIT_INDEX, 1), |
| 1, |
| `Atomics.notify(i32a, WAIT_INDEX, 1) returns 1 (${i})` |
| ); |
| |
| notified.push($262.agent.getReport()); |
| } |
| |
| assert.sameValue( |
| notified.join(''), |
| waiterlist.join(''), |
| 'notified.join(\'\') returns waiterlist.join(\'\')' |
| ); |