add zero timer

2014-07-17 21:18:53 -07:00 · 2014-07-17 21:18:53 -07:00 · f351476bfb
--- a/index.html
+++ b/index.html
@ -4,6 +4,7 @@
 <head>
  <meta charset="UTF-8">
  <script type="text/javascript" src="zipfile.js" defer></script>
+  <script type="text/javascript" src="timer.js" defer></script>
  <script type="text/javascript" src="util.js" defer></script>
  <script type="text/javascript" src="long.js" defer></script>
  <script type="text/javascript" src="classfile/reader.js" defer></script>
--- a/threads.js
+++ b/threads.js
@ -6,7 +6,6 @@
 var Threads = function() {
    this.threads = [];
    this.empty = [];
-    this.ready = [];
    var mainThread = new Thread("main");
    this.add(mainThread);
    this.current = mainThread;
@ -37,16 +36,3 @@ Threads.prototype.count = function() {
 Threads.prototype.getThread = function(pid) {
    return this.threads[pid];
 }
-
-Threads.prototype.yield = function(frame) {
-    if (this.ready.length) {
-        this.current.frame = frame;
-        this.ready.unshift(this.current);
-        this.current = this.ready[this.ready.length - 1];
-    }
-    window.postMessage(null, "*");
-}
-
-Threads.prototype.resume = function() {
-    VM.resume(this.current.frame);
-}
--- a/timer.js
+++ b/timer.js
@ -0,0 +1,34 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+
+'use strict';
+
+// Only add setZeroTimeout to the window object, and hide everything
+// else in a closure.
+(function() {
+    var timeouts = [];
+    var messageName = "zero-timeout-message";
+
+    // Like setTimeout, but only takes a function argument.  There's
+    // no time argument (always zero) and no arguments (you have to
+    // use a closure).
+    function setZeroTimeout(fn) {
+        timeouts.push(fn);
+        window.postMessage(messageName, "*");
+    }
+
+    function handleMessage(event) {
+        if (event.source == window && event.data == messageName) {
+            event.stopPropagation();
+            if (timeouts.length > 0) {
+                var fn = timeouts.shift();
+                fn();
+            }
+        }
+    }
+
+    window.addEventListener("message", handleMessage, true);
+
+    // Add the one thing we want added to the window object.
+    window.setZeroTimeout = setZeroTimeout;
+})();