1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/chromium/base/profiler/tracked_time.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,71 @@
1.4 +// Copyright (c) 2012 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef BASE_PROFILER_TRACKED_TIME_H_
1.9 +#define BASE_PROFILER_TRACKED_TIME_H_
1.10 +
1.11 +
1.12 +#include "base/base_export.h"
1.13 +#include "base/basictypes.h"
1.14 +#include "base/time/time.h"
1.15 +
1.16 +namespace tracked_objects {
1.17 +
1.18 +//------------------------------------------------------------------------------
1.19 +
1.20 +// TimeTicks maintains a wasteful 64 bits of data (we need less than 32), and on
1.21 +// windows, a 64 bit timer is expensive to even obtain. We use a simple
1.22 +// millisecond counter for most of our time values, as well as millisecond units
1.23 +// of duration between those values. This means we can only handle durations
1.24 +// up to 49 days (range), or 24 days (non-negative time durations).
1.25 +// We only define enough methods to service the needs of the tracking classes,
1.26 +// and our interfaces are modeled after what TimeTicks and TimeDelta use (so we
1.27 +// can swap them into place if we want to use the "real" classes).
1.28 +
1.29 +class BASE_EXPORT Duration { // Similar to base::TimeDelta.
1.30 + public:
1.31 + Duration();
1.32 +
1.33 + Duration& operator+=(const Duration& other);
1.34 + Duration operator+(const Duration& other) const;
1.35 +
1.36 + bool operator==(const Duration& other) const;
1.37 + bool operator!=(const Duration& other) const;
1.38 + bool operator>(const Duration& other) const;
1.39 +
1.40 + static Duration FromMilliseconds(int ms);
1.41 +
1.42 + int32 InMilliseconds() const;
1.43 +
1.44 + private:
1.45 + friend class TrackedTime;
1.46 + explicit Duration(int32 duration);
1.47 +
1.48 + // Internal time is stored directly in milliseconds.
1.49 + int32 ms_;
1.50 +};
1.51 +
1.52 +class BASE_EXPORT TrackedTime { // Similar to base::TimeTicks.
1.53 + public:
1.54 + TrackedTime();
1.55 + explicit TrackedTime(const base::TimeTicks& time);
1.56 +
1.57 + static TrackedTime Now();
1.58 + Duration operator-(const TrackedTime& other) const;
1.59 + TrackedTime operator+(const Duration& other) const;
1.60 + bool is_null() const;
1.61 +
1.62 + static TrackedTime FromMilliseconds(int32 ms) { return TrackedTime(ms); }
1.63 +
1.64 + private:
1.65 + friend class Duration;
1.66 + explicit TrackedTime(int32 ms);
1.67 +
1.68 + // Internal duration is stored directly in milliseconds.
1.69 + uint32 ms_;
1.70 +};
1.71 +
1.72 +} // namespace tracked_objects
1.73 +
1.74 +#endif // BASE_PROFILER_TRACKED_TIME_H_
