WebWorkers example with two way messages.

- Prime number background worker that can be started, stopped and reset that calculates prime numbers and sends them back to the main page/thread.
2010-04-10 15:52:27 -04:00
parent 85b7a7d411
commit d628147bca
2 changed files with 79 additions and 0 deletions
@@ -0,0 +1,39 @@
+var n = 1;
+var cur = 1;
+var timer = null;
+
+function search() {
+    if (timer) clearTimeout(timer);
+    var sqrtn = Math.sqrt(n);
+    for (iters = 0; iters < 10000; iters += 1) {
+        cur += 1;
+        if ((cur <= sqrtn) && (n % cur != 0)) continue;
+        if (cur > sqrtn) {
+            postMessage("num:" + n);
+        }
+        n += 1;
+        cur = 1;
+    }
+    timer = setTimeout(search, 10);
+}
+
+
+onmessage = function (e) {
+    switch (e.data) {
+        case 'start':
+            postMessage("log:start");
+            if (timer) clearTimeout(timer);
+            timer = setTimeout(search, 100);
+            break;
+        case 'stop':
+            postMessage("log:stop");
+            if (timer) clearTimeout(timer);
+            started = false;
+            break;
+        case 'reset':
+            postMessage("log:reset");
+            n = 1;
+            postMessage('num:');
+            break;
+    }
+}