v8/test/mjsunit/d8-worker.js

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// Test the Worker API of d8.  This test only makes sense with d8. A Worker
// spawns a new OS thread and isolate, and runs it concurrently with the
// current running thread.

function f() {
  postMessage("Starting worker");
  // Set a global variable; should not be visible outside of the worker's
  // context.
  foo = 100;

  var c = 0;
  onmessage = function(m) {
    switch (c++) {
      case 0:
        if (m !== undefined) throw new Error("undefined");
        break;
      case 1:
        if (m !== null) throw new Error("null");
        break;
      case 2:
        if (m !== true) throw new Error("true");
        break;
      case 3:
        if (m !== false) throw new Error("false");
        break;
      case 4:
        if (m !== 100) throw new Error("Number");
        break;
      case 5:
        if (m !== "hi") throw new Error("String");
        break;
      case 6:
        if (JSON.stringify(m) !== '[4,true,"bye"]') throw new Error("Array");
        break;
      case 7:
        if (JSON.stringify(m) !== '{"a":1,"b":2.5,"c":"three"}')
          throw new Error("Object");
        break;
      case 8:
        var ab = m;
        var t = new Uint32Array(ab);
        if (ab.byteLength !== 16)
          throw new Error("ArrayBuffer clone byteLength");
        for (var i = 0; i < 4; ++i)
          if (t[i] !== i)
            throw new Error("ArrayBuffer clone value " + i);
        break;
      case 9:
        var ab = m;
        var t = new Uint32Array(ab);
        if (ab.byteLength !== 32)
          throw new Error("ArrayBuffer transfer byteLength");
        for (var i = 0; i < 8; ++i)
          if (t[i] !== i)
            throw new Error("ArrayBuffer transfer value " + i);
        break;
    }

    if (c == 10) {
      postMessage("DONE");
    }
  }
}


if (this.Worker) {
  function createArrayBuffer(byteLength) {
    var ab = new ArrayBuffer(byteLength);
    var t = new Uint32Array(ab);
    for (var i = 0; i < byteLength / 4; ++i)
      t[i] = i;
    return ab;
  }

  var w = new Worker(f);

  assertEquals("Starting worker", w.getMessage());

  w.postMessage(undefined);
  w.postMessage(null);
  w.postMessage(true);
  w.postMessage(false);
  w.postMessage(100);
  w.postMessage("hi");
  w.postMessage([4, true, "bye"]);
  w.postMessage({a: 1, b: 2.5, c: "three"});

  // Clone ArrayBuffer
  var ab1 = createArrayBuffer(16);
  w.postMessage(ab1);
  assertEquals(16, ab1.byteLength);  // ArrayBuffer should not be neutered.

  // Transfer ArrayBuffer
  var ab2 = createArrayBuffer(32);
  w.postMessage(ab2, [ab2]);
  assertEquals(0, ab2.byteLength);  // ArrayBuffer should be neutered.

  assertEquals("undefined", typeof foo);

  // Read a message from the worker.
  assertEquals("DONE", w.getMessage());

  w.terminate();


  // Make sure that the main thread doesn't block forever in getMessage() if
  // the worker dies without posting a message.
  function f2() {}
  var w2 = new Worker(f2);
  var msg = w2.getMessage();
  assertEquals(undefined, msg);
}