From 86e03b75018ec6dd9e17b14d680aac2b06b250fe Mon Sep 17 00:00:00 2001
From: Fabian Jakobs <fabian@c9.io>
Date: Wed, 18 Feb 2015 09:34:10 +0000
Subject: [PATCH] add function to measure event loop run times

---
 node_modules/c9/blocked.js      | 16 ++++++++
 node_modules/c9/blocked_test.js | 65 +++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 node_modules/c9/blocked.js
 create mode 100644 node_modules/c9/blocked_test.js

diff --git a/node_modules/c9/blocked.js b/node_modules/c9/blocked.js
new file mode 100644
index 00000000..14e760fb
--- /dev/null
+++ b/node_modules/c9/blocked.js
@@ -0,0 +1,16 @@
+// module.exports = function (callback) {
+//     var start = Date.now();
+//     setImmediate(function () {
+//         var took = Date.now() - start;
+//         return callback(null, took);
+//     }, 0);
+// };
+module.exports = function (callback) {
+    var start = Date.now();
+    // setInterval is handled after setImmediate and setTimeout handlers
+    var interval = setTimeout(function () {
+        clearInterval(interval);
+        var took = Date.now() - start;
+        return callback(null, took);
+    }, 0);
+};
\ No newline at end of file
diff --git a/node_modules/c9/blocked_test.js b/node_modules/c9/blocked_test.js
new file mode 100644
index 00000000..63896960
--- /dev/null
+++ b/node_modules/c9/blocked_test.js
@@ -0,0 +1,65 @@
+"use strict";
+"use server";
+
+var assert = require("assert");
+var blocked = require("./blocked");
+
+module.exports = {
+    
+    "test normal run should return low blocked time": function(next) {
+        blocked(function(err, time) {
+            assert(!err, err);
+            assert(time < 10);
+            next();
+        });
+    },
+    "test busy loop should report high blocked time": function(next) {
+        blocked(function(err, time) {
+            assert(!err, err);
+            assert(time >= 100);
+            next();
+        });
+        
+        var start = Date.now();
+        while (Date.now() - start < 100) {}
+    },
+    "test busy loop in setTimeout should report high blocked time": function(next) {
+        setTimeout(function() {
+            var start = Date.now();
+            while (Date.now() - start < 100) {}
+        }, 0);
+        
+        blocked(function(err, time) {
+            assert(!err, err);
+            assert(time >= 100);
+            next();
+        });
+    },
+    "test busy loop in setInterval should report high blocked time": function(next) {
+        var interval = setInterval(function() {
+            clearInterval(interval);
+            var start = Date.now();
+            while (Date.now() - start < 100) {}
+        });
+        
+        blocked(function(err, time) {
+            assert(!err, err);
+            assert(time >= 100);
+            next();
+        });
+    },
+    "test busy loop in setImmediate should report high blocked time": function(next) {
+        setImmediate(function() {
+            var start = Date.now();
+            while (Date.now() - start < 100) {}
+        });
+        
+        blocked(function(err, time) {
+            assert(!err, err);
+            assert(time >= 100);
+            next();
+        });
+    }
+};
+
+!module.parent && require("asyncjs").test.testcase(module.exports).exec();
\ No newline at end of file