Promises (first look)

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Small fixes

vendors/Q/benchmark/compare-with-callbacks.js

@@ -0,0 +1,71 @@
+"use strict";
+
+var Q = require("../q");
+var fs = require("fs");
+
+suite("A single simple async operation", function () {
+    bench("with an immediately-fulfilled promise", function (done) {
+        Q().then(done);
+    });
+
+    bench("with direct setImmediate usage", function (done) {
+        setImmediate(done);
+    });
+
+    bench("with direct setTimeout(…, 0)", function (done) {
+        setTimeout(done, 0);
+    });
+});
+
+suite("A fs.readFile", function () {
+    var denodeified = Q.denodeify(fs.readFile);
+
+    set("iterations", 1000);
+    set("delay", 1000);
+
+    bench("directly, with callbacks", function (done) {
+        fs.readFile(__filename, done);
+    });
+
+    bench("with Q.nfcall", function (done) {
+        Q.nfcall(fs.readFile, __filename).then(done);
+    });
+
+    bench("with a Q.denodeify'ed version", function (done) {
+        denodeified(__filename).then(done);
+    });
+
+    bench("with manual usage of deferred.makeNodeResolver", function (done) {
+        var deferred = Q.defer();
+        fs.readFile(__filename, deferred.makeNodeResolver());
+        deferred.promise.then(done);
+    });
+});
+
+suite("1000 operations in parallel", function () {
+    function makeCounter(desiredCount, ultimateCallback) {
+        var soFar = 0;
+        return function () {
+            if (++soFar === desiredCount) {
+                ultimateCallback();
+            }
+        };
+    }
+    var numberOfOps = 1000;
+
+    bench("with immediately-fulfilled promises", function (done) {
+        var counter = makeCounter(numberOfOps, done);
+
+        for (var i = 0; i < numberOfOps; ++i) {
+            Q().then(counter);
+        }
+    });
+
+    bench("with direct setImmediate usage", function (done) {
+        var counter = makeCounter(numberOfOps, done);
+
+        for (var i = 0; i < numberOfOps; ++i) {
+            setImmediate(counter);
+        }
+    });
+});