// Copyright (C) 2017 Mozilla Corporation.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-atomics.wake
description: >
  Test that Atomics.wake wakes agents in the order they are waiting.
includes: [atomicsHelper.js]
features: [Atomics, SharedArrayBuffer, TypedArray]
---*/

const NUMAGENT = 3;
const WAKEUP = 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 NUMELEM = 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 wake them
// one by one and observe the wakeup 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, ${WAKEUP}, 0));
      $262.agent.leaving();
    });
  `);
}

const i32a = new Int32Array(
  new SharedArrayBuffer(NUMELEM * Int32Array.BYTES_PER_ELEMENT)
);

$262.agent.broadcast(i32a.buffer);

// Wait for agents to be running.
waitUntil(i32a, RUNNING, NUMAGENT);

// Sleep to allow the agents a fair chance to wait. If we don't,
// we risk sending the wakeup before agents are sleeping, and we hang.
$262.agent.sleep(50);

// Make them sleep in order 0 1 2 on i32a[0]
for (var i = 0; i < NUMAGENT; i++) {
  Atomics.store(i32a, SPIN + i, 1);
  $262.agent.sleep(50);
}

// Wake them up one at a time and check the order is 0 1 2
for (var i = 0; i < NUMAGENT; i++) {
  assert.sameValue(Atomics.wake(i32a, WAKEUP, 1), 1, 'Atomics.wake(i32a, WAKEUP, 1) returns 1');
  assert.sameValue(getReport(), i + 'ok', 'getReport() returns i + "ok"');
}