auto import from //depot/cupcake/@135843
diff --git a/libs/utils/StopWatch.cpp b/libs/utils/StopWatch.cpp
new file mode 100644
index 0000000..68a1c52
--- /dev/null
+++ b/libs/utils/StopWatch.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2005 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "StopWatch"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <utils/Log.h>
+#include <utils/Errors.h>
+#include <utils/StopWatch.h>
+
+/*****************************************************************************/
+
+namespace android {
+
+
+StopWatch::StopWatch(const char *name, int clock, uint32_t flags)
+ : mName(name), mClock(clock), mFlags(flags),
+ mStartTime(0), mNumLaps(0)
+{
+ mStartTime = systemTime(mClock);
+}
+
+StopWatch::~StopWatch()
+{
+ nsecs_t elapsed = elapsedTime();
+ const int n = mNumLaps;
+ LOGD("StopWatch %s (us): %lld ", mName, ns2us(elapsed));
+ for (int i=0 ; i<n ; i++) {
+ const nsecs_t soFar = mLaps[i].soFar;
+ const nsecs_t thisLap = mLaps[i].thisLap;
+ LOGD(" [%d: %lld, %lld]", i, ns2us(soFar), ns2us(thisLap));
+ }
+}
+
+const char* StopWatch::name() const
+{
+ return mName;
+}
+
+nsecs_t StopWatch::lap()
+{
+ nsecs_t elapsed = elapsedTime();
+ if (mNumLaps >= 8) {
+ elapsed = 0;
+ } else {
+ const int n = mNumLaps;
+ mLaps[n].soFar = elapsed;
+ mLaps[n].thisLap = n ? (elapsed - mLaps[n-1].soFar) : elapsed;
+ mNumLaps = n+1;
+ }
+ return elapsed;
+}
+
+nsecs_t StopWatch::elapsedTime() const
+{
+ return systemTime(mClock) - mStartTime;
+}
+
+
+/*****************************************************************************/
+
+}; // namespace android
+