72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_PROFILER_TRACKED_TIME_H_
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#define BASE_PROFILER_TRACKED_TIME_H_
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#include "base/base_export.h"
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#include "base/basictypes.h"
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#include "base/time/time.h"
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namespace tracked_objects {
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//------------------------------------------------------------------------------
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// TimeTicks maintains a wasteful 64 bits of data (we need less than 32), and on
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// windows, a 64 bit timer is expensive to even obtain. We use a simple
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// millisecond counter for most of our time values, as well as millisecond units
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// of duration between those values. This means we can only handle durations
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// up to 49 days (range), or 24 days (non-negative time durations).
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// We only define enough methods to service the needs of the tracking classes,
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// and our interfaces are modeled after what TimeTicks and TimeDelta use (so we
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// can swap them into place if we want to use the "real" classes).
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class BASE_EXPORT Duration { // Similar to base::TimeDelta.
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public:
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Duration();
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Duration& operator+=(const Duration& other);
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Duration operator+(const Duration& other) const;
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bool operator==(const Duration& other) const;
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bool operator!=(const Duration& other) const;
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bool operator>(const Duration& other) const;
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static Duration FromMilliseconds(int ms);
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int32 InMilliseconds() const;
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private:
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friend class TrackedTime;
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explicit Duration(int32 duration);
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// Internal time is stored directly in milliseconds.
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int32 ms_;
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};
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class BASE_EXPORT TrackedTime { // Similar to base::TimeTicks.
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public:
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TrackedTime();
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explicit TrackedTime(const base::TimeTicks& time);
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static TrackedTime Now();
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Duration operator-(const TrackedTime& other) const;
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TrackedTime operator+(const Duration& other) const;
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bool is_null() const;
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static TrackedTime FromMilliseconds(int32 ms) { return TrackedTime(ms); }
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private:
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friend class Duration;
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explicit TrackedTime(int32 ms);
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// Internal duration is stored directly in milliseconds.
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uint32 ms_;
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};
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} // namespace tracked_objects
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#endif // BASE_PROFILER_TRACKED_TIME_H_
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