security/sandbox/chromium/base/profiler/tracked_time.h@44a2da4a2ab2 (annotated)
security/sandbox/chromium/base/profiler/tracked_time.h
Fri, 16 Jan 2015 04:50:19 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 04:50:19 +0100
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
- permissions
- -rw-r--r--
Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32
| michael@0 | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #ifndef BASE_PROFILER_TRACKED_TIME_H_ |
| michael@0 | 6 | #define BASE_PROFILER_TRACKED_TIME_H_ |
| michael@0 | 7 | |
| michael@0 | 8 | |
| michael@0 | 9 | #include "base/base_export.h" |
| michael@0 | 10 | #include "base/basictypes.h" |
| michael@0 | 11 | #include "base/time/time.h" |
| michael@0 | 12 | |
| michael@0 | 13 | namespace tracked_objects { |
| michael@0 | 14 | |
| michael@0 | 15 | //------------------------------------------------------------------------------ |
| michael@0 | 16 | |
| michael@0 | 17 | // TimeTicks maintains a wasteful 64 bits of data (we need less than 32), and on |
| michael@0 | 18 | // windows, a 64 bit timer is expensive to even obtain. We use a simple |
| michael@0 | 19 | // millisecond counter for most of our time values, as well as millisecond units |
| michael@0 | 20 | // of duration between those values. This means we can only handle durations |
| michael@0 | 21 | // up to 49 days (range), or 24 days (non-negative time durations). |
| michael@0 | 22 | // We only define enough methods to service the needs of the tracking classes, |
| michael@0 | 23 | // and our interfaces are modeled after what TimeTicks and TimeDelta use (so we |
| michael@0 | 24 | // can swap them into place if we want to use the "real" classes). |
| michael@0 | 25 | |
| michael@0 | 26 | class BASE_EXPORT Duration { // Similar to base::TimeDelta. |
| michael@0 | 27 | public: |
| michael@0 | 28 | Duration(); |
| michael@0 | 29 | |
| michael@0 | 30 | Duration& operator+=(const Duration& other); |
| michael@0 | 31 | Duration operator+(const Duration& other) const; |
| michael@0 | 32 | |
| michael@0 | 33 | bool operator==(const Duration& other) const; |
| michael@0 | 34 | bool operator!=(const Duration& other) const; |
| michael@0 | 35 | bool operator>(const Duration& other) const; |
| michael@0 | 36 | |
| michael@0 | 37 | static Duration FromMilliseconds(int ms); |
| michael@0 | 38 | |
| michael@0 | 39 | int32 InMilliseconds() const; |
| michael@0 | 40 | |
| michael@0 | 41 | private: |
| michael@0 | 42 | friend class TrackedTime; |
| michael@0 | 43 | explicit Duration(int32 duration); |
| michael@0 | 44 | |
| michael@0 | 45 | // Internal time is stored directly in milliseconds. |
| michael@0 | 46 | int32 ms_; |
| michael@0 | 47 | }; |
| michael@0 | 48 | |
| michael@0 | 49 | class BASE_EXPORT TrackedTime { // Similar to base::TimeTicks. |
| michael@0 | 50 | public: |
| michael@0 | 51 | TrackedTime(); |
| michael@0 | 52 | explicit TrackedTime(const base::TimeTicks& time); |
| michael@0 | 53 | |
| michael@0 | 54 | static TrackedTime Now(); |
| michael@0 | 55 | Duration operator-(const TrackedTime& other) const; |
| michael@0 | 56 | TrackedTime operator+(const Duration& other) const; |
| michael@0 | 57 | bool is_null() const; |
| michael@0 | 58 | |
| michael@0 | 59 | static TrackedTime FromMilliseconds(int32 ms) { return TrackedTime(ms); } |
| michael@0 | 60 | |
| michael@0 | 61 | private: |
| michael@0 | 62 | friend class Duration; |
| michael@0 | 63 | explicit TrackedTime(int32 ms); |
| michael@0 | 64 | |
| michael@0 | 65 | // Internal duration is stored directly in milliseconds. |
| michael@0 | 66 | uint32 ms_; |
| michael@0 | 67 | }; |
| michael@0 | 68 | |
| michael@0 | 69 | } // namespace tracked_objects |
| michael@0 | 70 | |
| michael@0 | 71 | #endif // BASE_PROFILER_TRACKED_TIME_H_ |
