| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |
| #define MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |
| |
| #include "base/metrics/histogram.h" |
| #include "base/time/time.h" |
| |
| // Scoped class which logs its time on this earth as a UMA statistic. Must be |
| // a #define macro since UMA macros prevent variables as names. The nested |
| // macro is necessary to expand __COUNTER__ to an actual value. |
| #define SCOPED_UMA_HISTOGRAM_TIMER(name) \ |
| SCOPED_UMA_HISTOGRAM_TIMER_EXPANDER(name, __COUNTER__) |
| |
| #define SCOPED_UMA_HISTOGRAM_TIMER_EXPANDER(name, key) \ |
| SCOPED_UMA_HISTOGRAM_TIMER_UNIQUE(name, key) |
| |
| #define SCOPED_UMA_HISTOGRAM_TIMER_UNIQUE(name, key) \ |
| class ScopedHistogramTimer##key { \ |
| public: \ |
| ScopedHistogramTimer##key() : constructed_(base::TimeTicks::Now()) {} \ |
| ~ScopedHistogramTimer##key() { \ |
| base::TimeDelta elapsed = base::TimeTicks::Now() - constructed_; \ |
| UMA_HISTOGRAM_TIMES(name, elapsed); \ |
| } \ |
| private: \ |
| base::TimeTicks constructed_; \ |
| } scoped_histogram_timer_##key |
| |
| #endif // MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |