Add d8 API for spawning function on a new thread (Second try)

test/mjsunit/d8-worker.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// 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());
+
+  // Currently can only create one worker at a time.
+  assertThrows(function() { new Worker(f); });
+
+  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();
+}