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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |
| 6 #define MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |
| 7 |
| 8 #include "base/metrics/histogram.h" |
| 9 #include "base/time.h" |
| 10 |
| 11 // Scoped class which logs its time on this earth as a UMA statistic. Must be |
| 12 // a #define macro since UMA macros prevent variables as names. The nested |
| 13 // macro is necessary to expand __COUNTER__ to an actual value. |
| 14 #define SCOPED_UMA_HISTOGRAM_TIMER(name) \ |
| 15 SCOPED_UMA_HISTOGRAM_TIMER_EXPANDER(name, __COUNTER__) |
| 16 |
| 17 #define SCOPED_UMA_HISTOGRAM_TIMER_EXPANDER(name, key) \ |
| 18 SCOPED_UMA_HISTOGRAM_TIMER_UNIQUE(name, key) |
| 19 |
| 20 #define SCOPED_UMA_HISTOGRAM_TIMER_UNIQUE(name, key) \ |
| 21 class ScopedHistogramTimer##key { \ |
| 22 public: \ |
| 23 ScopedHistogramTimer##key() : constructed_(base::TimeTicks::Now()) {} \ |
| 24 ~ScopedHistogramTimer##key() { \ |
| 25 base::TimeDelta elapsed = base::TimeTicks::Now() - constructed_; \ |
| 26 UMA_HISTOGRAM_TIMES(name, elapsed); \ |
| 27 } \ |
| 28 private: \ |
| 29 base::TimeTicks constructed_; \ |
| 30 } scoped_histogram_timer_##key |
| 31 |
| 32 #endif // MEDIA_BASE_SCOPED_HISTOGRAM_TIMER_H_ |
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