v8/test/mjsunit/d8-worker.js

// Copyright 2015 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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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.

var workerScript =
  `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(workerScript);

  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.
  var w2 = new Worker('');
  var msg = w2.getMessage();
  assertEquals(undefined, msg);
}