Add bench and test for SkRefCnt.

http://codereview.appspot.com/6195071/

This also adds a cross platform SkThread for testing purposes.


git-svn-id: http://skia.googlecode.com/svn/trunk@3921 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 77 insertions, 0 deletions

diff --git a/bench/RefCntBench.cpp b/bench/RefCntBench.cpp
new file mode 100644
index 0000000000..44fb648f4e
--- /dev/null
+++ b/bench/RefCntBench.cpp
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkBenchmark.h"
+#include "SkThread.h"
+#include <memory>
+
+enum {
+    N = SkBENCHLOOP(1000000),
+    M = SkBENCHLOOP(2)
+};
+
+class RefCntBench_Stack : public SkBenchmark {
+public:
+    RefCntBench_Stack(void* param) : INHERITED(param) {
+    }
+protected:
+    virtual const char* onGetName() {
+        return "ref_cnt_stack";
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        for (int i = 0; i < N; ++i) {
+            SkRefCnt ref;
+            for (int j = 0; j < M; ++j) {
+                ref.ref();
+                ref.unref();
+            }
+        }
+    }
+
+private:
+    typedef SkBenchmark INHERITED;
+};
+
+class PlacedRefCnt : public SkRefCnt {
+public:
+    PlacedRefCnt() : SkRefCnt() { }
+    void operator delete(void *p) { }
+};
+
+class RefCntBench_Heap : public SkBenchmark {
+public:
+    RefCntBench_Heap(void* param) : INHERITED(param) {
+    }
+protected:
+    virtual const char* onGetName() {
+        return "ref_cnt_heap";
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        char memory[sizeof(PlacedRefCnt)];
+        for (int i = 0; i < N; ++i) {
+            PlacedRefCnt* ref = new (memory) PlacedRefCnt();
+            for (int j = 0; j < M; ++j) {
+                ref->ref();
+                ref->unref();
+            }
+            ref->unref();
+        }
+    }
+
+private:
+    typedef SkBenchmark INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkBenchmark* Fact0(void* p) { return new RefCntBench_Stack(p); }
+static SkBenchmark* Fact1(void* p) { return new RefCntBench_Heap(p); }
+
+static BenchRegistry gReg01(Fact0);
+static BenchRegistry gReg02(Fact1);
+