The Tor Browser: comparison ipc/chromium/src/base/time.h

--1:000000000000
+:e1e46cc491b4
+// Copyright (c) 2006-2008 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.
+// Time represents an absolute point in time, internally represented as
+// microseconds (s/1,000,000) since a platform-dependent epoch.  Each
+// platform's epoch, along with other system-dependent clock interface
+// routines, is defined in time_PLATFORM.cc.
+//
+// TimeDelta represents a duration of time, internally represented in
+// microseconds.
+//
+// TimeTicks represents an abstract time that is always incrementing for use
+// in measuring time durations. It is internally represented in microseconds.
+// It can not be converted to a human-readable time, but is guaranteed not to
+// decrease (if the user changes the computer clock, Time::Now() may actually
+// decrease or jump).
+//
+// These classes are represented as only a 64-bit value, so they can be
+// efficiently passed by value.
+#ifndef BASE_TIME_H_
+#define BASE_TIME_H_
+#include <time.h>
+#include "base/basictypes.h"
+#if defined(OS_WIN)
+// For FILETIME in FromFileTime, until it moves to a new converter class.
+// See TODO(iyengar) below.
+#include <windows.h>
+#endif
+namespace base {
+class Time;
+class TimeTicks;
+// This unit test does a lot of manual time manipulation.
+class PageLoadTrackerUnitTest;
+// TimeDelta ------------------------------------------------------------------
+class TimeDelta {
+public:
+TimeDelta() : delta_(0) {
+}
+// Converts units of time to TimeDeltas.
+static TimeDelta FromDays(int64_t days);
+static TimeDelta FromHours(int64_t hours);
+static TimeDelta FromMinutes(int64_t minutes);
+static TimeDelta FromSeconds(int64_t secs);
+static TimeDelta FromMilliseconds(int64_t ms);
+static TimeDelta FromMicroseconds(int64_t us);
+// Returns the internal numeric value of the TimeDelta object. Please don't
+// use this and do arithmetic on it, as it is more error prone than using the
+// provided operators.
+int64_t ToInternalValue() const {
+return delta_;
+}
+// Returns the time delta in some unit. The F versions return a floating
+// point value, the "regular" versions return a rounded-down value.
+int InDays() const;
+int InHours() const;
+int InMinutes() const;
+double InSecondsF() const;
+int64_t InSeconds() const;
+double InMillisecondsF() const;
+int64_t InMilliseconds() const;
+int64_t InMicroseconds() const;
+TimeDelta& operator=(TimeDelta other) {
+delta_ = other.delta_;
+return *this;
+}
+// Computations with other deltas.
+TimeDelta operator+(TimeDelta other) const {
+return TimeDelta(delta_ + other.delta_);
+}
+TimeDelta operator-(TimeDelta other) const {
+return TimeDelta(delta_ - other.delta_);
+}
+TimeDelta& operator+=(TimeDelta other) {
+delta_ += other.delta_;
+return *this;
+}
+TimeDelta& operator-=(TimeDelta other) {
+delta_ -= other.delta_;
+return *this;
+}
+TimeDelta operator-() const {
+return TimeDelta(-delta_);
+}
+// Computations with ints, note that we only allow multiplicative operations
+// with ints, and additive operations with other deltas.
+TimeDelta operator*(int64_t a) const {
+return TimeDelta(delta_ * a);
+}
+TimeDelta operator/(int64_t a) const {
+return TimeDelta(delta_ / a);
+}
+TimeDelta& operator*=(int64_t a) {
+delta_ *= a;
+return *this;
+}
+TimeDelta& operator/=(int64_t a) {
+delta_ /= a;
+return *this;
+}
+int64_t operator/(TimeDelta a) const {
+return delta_ / a.delta_;
+}
+// Defined below because it depends on the definition of the other classes.
+Time operator+(Time t) const;
+TimeTicks operator+(TimeTicks t) const;
+// Comparison operators.
+bool operator==(TimeDelta other) const {
+return delta_ == other.delta_;
+}
+bool operator!=(TimeDelta other) const {
+return delta_ != other.delta_;
+}
+bool operator<(TimeDelta other) const {
+return delta_ < other.delta_;
+}
+bool operator<=(TimeDelta other) const {
+return delta_ <= other.delta_;
+}
+bool operator>(TimeDelta other) const {
+return delta_ > other.delta_;
+}
+bool operator>=(TimeDelta other) const {
+return delta_ >= other.delta_;
+}
+private:
+friend class Time;
+friend class TimeTicks;
+friend TimeDelta operator*(int64_t a, TimeDelta td);
+// Constructs a delta given the duration in microseconds. This is private
+// to avoid confusion by callers with an integer constructor. Use
+// FromSeconds, FromMilliseconds, etc. instead.
+explicit TimeDelta(int64_t delta_us) : delta_(delta_us) {
+}
+// Delta in microseconds.
+int64_t delta_;
+};
+inline TimeDelta operator*(int64_t a, TimeDelta td) {
+return TimeDelta(a * td.delta_);
+}
+// Time -----------------------------------------------------------------------
+// Represents a wall clock time.
+class Time {
+public:
+static const int64_t kMillisecondsPerSecond = 1000;
+static const int64_t kMicrosecondsPerMillisecond = 1000;
+static const int64_t kMicrosecondsPerSecond = kMicrosecondsPerMillisecond *
+kMillisecondsPerSecond;
+static const int64_t kMicrosecondsPerMinute = kMicrosecondsPerSecond * 60;
+static const int64_t kMicrosecondsPerHour = kMicrosecondsPerMinute * 60;
+static const int64_t kMicrosecondsPerDay = kMicrosecondsPerHour * 24;
+static const int64_t kMicrosecondsPerWeek = kMicrosecondsPerDay * 7;
+static const int64_t kNanosecondsPerMicrosecond = 1000;
+static const int64_t kNanosecondsPerSecond = kNanosecondsPerMicrosecond *
+kMicrosecondsPerSecond;
+// Represents an exploded time that can be formatted nicely. This is kind of
+// like the Win32 SYSTEMTIME structure or the Unix "struct tm" with a few
+// additions and changes to prevent errors.
+struct Exploded {
+int year;                 // Four digit year "2007"
+signed char month;        // 1-based month (values 1 = January, etc.)
+signed char day_of_week;  // 0-based day of week (0 = Sunday, etc.)
+signed char day_of_month; // 1-based day of month (1-31)
+signed char hour;         // Hour within the current day (0-23)
+signed char minute;       // Minute within the current hour (0-59)
+signed char second;       // Second within the current minute (0-59 plus
+// leap seconds which may take it up to 60).
+int millisecond;          // Milliseconds within the current second (0-999)
+};
+// Contains the NULL time. Use Time::Now() to get the current time.
+explicit Time() : us_(0) {
+}
+// Returns true if the time object has not been initialized.
+bool is_null() const {
+return us_ == 0;
+}
+// Returns the current time. Watch out, the system might adjust its clock
+// in which case time will actually go backwards. We don't guarantee that
+// times are increasing, or that two calls to Now() won't be the same.
+static Time Now();
+// Returns the current time. Same as Now() except that this function always
+// uses system time so that there are no discrepancies between the returned
+// time and system time even on virtual environments including our test bot.
+// For timing sensitive unittests, this function should be used.
+static Time NowFromSystemTime();
+// Converts to/from time_t in UTC and a Time class.
+// TODO(brettw) this should be removed once everybody starts using the |Time|
+// class.
+static Time FromTimeT(time_t tt);
+time_t ToTimeT() const;
+// Converts time to/from a double which is the number of seconds since epoch
+// (Jan 1, 1970).  Webkit uses this format to represent time.
+static Time FromDoubleT(double dt);
+double ToDoubleT() const;
+#if defined(OS_WIN)
+static Time FromFileTime(FILETIME ft);
+FILETIME ToFileTime() const;
+#endif
+// Converts an exploded structure representing either the local time or UTC
+// into a Time class.
+static Time FromUTCExploded(const Exploded& exploded) {
+return FromExploded(false, exploded);
+}
+static Time FromLocalExploded(const Exploded& exploded) {
+return FromExploded(true, exploded);
+}
+// Converts an integer value representing Time to a class. This is used
+// when deserializing a |Time| structure, using a value known to be
+// compatible. It is not provided as a constructor because the integer type
+// may be unclear from the perspective of a caller.
+static Time FromInternalValue(int64_t us) {
+return Time(us);
+}
+// Converts a string representation of time to a Time object.
+// An example of a time string which is converted is as below:-
+// "Tue, 15 Nov 1994 12:45:26 GMT". If the timezone is not specified
+// in the input string, we assume local time.
+// TODO(iyengar) Move the FromString/FromTimeT/ToTimeT/FromFileTime to
+// a new time converter class.
+static bool FromString(const wchar_t* time_string, Time* parsed_time);
+// For serializing, use FromInternalValue to reconstitute. Please don't use
+// this and do arithmetic on it, as it is more error prone than using the
+// provided operators.
+int64_t ToInternalValue() const {
+return us_;
+}
+// Fills the given exploded structure with either the local time or UTC from
+// this time structure (containing UTC).
+void UTCExplode(Exploded* exploded) const {
+return Explode(false, exploded);
+}
+void LocalExplode(Exploded* exploded) const {
+return Explode(true, exploded);
+}
+// Rounds this time down to the nearest day in local time. It will represent
+// midnight on that day.
+Time LocalMidnight() const;
+Time& operator=(Time other) {
+us_ = other.us_;
+return *this;
+}
+// Compute the difference between two times.
+TimeDelta operator-(Time other) const {
+return TimeDelta(us_ - other.us_);
+}
+// Modify by some time delta.
+Time& operator+=(TimeDelta delta) {
+us_ += delta.delta_;
+return *this;
+}
+Time& operator-=(TimeDelta delta) {
+us_ -= delta.delta_;
+return *this;
+}
+// Return a new time modified by some delta.
+Time operator+(TimeDelta delta) const {
+return us_ + delta.delta_;
+}
+Time operator-(TimeDelta delta) const {
+return us_ - delta.delta_;
+}
+// Comparison operators
+bool operator==(Time other) const {
+return us_ == other.us_;
+}
+bool operator!=(Time other) const {
+return us_ != other.us_;
+}
+bool operator<(Time other) const {
+return us_ < other.us_;
+}
+bool operator<=(Time other) const {
+return us_ <= other.us_;
+}
+bool operator>(Time other) const {
+return us_ > other.us_;
+}
+bool operator>=(Time other) const {
+return us_ >= other.us_;
+}
+private:
+friend class TimeDelta;
+// Explodes the given time to either local time |is_local = true| or UTC
+// |is_local = false|.
+void Explode(bool is_local, Exploded* exploded) const;
+// Unexplodes a given time assuming the source is either local time
+// |is_local = true| or UTC |is_local = false|.
+static Time FromExploded(bool is_local, const Exploded& exploded);
+Time(int64_t us) : us_(us) {
+}
+// The representation of Jan 1, 1970 UTC in microseconds since the
+// platform-dependent epoch.
+static const int64_t kTimeTToMicrosecondsOffset;
+// Time in microseconds in UTC.
+int64_t us_;
+};
+inline Time TimeDelta::operator+(Time t) const {
+return Time(t.us_ + delta_);
+}
+// Inline the TimeDelta factory methods, for fast TimeDelta construction.
+// static
+inline TimeDelta TimeDelta::FromDays(int64_t days) {
+return TimeDelta(days * Time::kMicrosecondsPerDay);
+}
+// static
+inline TimeDelta TimeDelta::FromHours(int64_t hours) {
+return TimeDelta(hours * Time::kMicrosecondsPerHour);
+}
+// static
+inline TimeDelta TimeDelta::FromMinutes(int64_t minutes) {
+return TimeDelta(minutes * Time::kMicrosecondsPerMinute);
+}
+// static
+inline TimeDelta TimeDelta::FromSeconds(int64_t secs) {
+return TimeDelta(secs * Time::kMicrosecondsPerSecond);
+}
+// static
+inline TimeDelta TimeDelta::FromMilliseconds(int64_t ms) {
+return TimeDelta(ms * Time::kMicrosecondsPerMillisecond);
+}
+// static
+inline TimeDelta TimeDelta::FromMicroseconds(int64_t us) {
+return TimeDelta(us);
+}
+// TimeTicks ------------------------------------------------------------------
+class TimeTicks {
+public:
+TimeTicks() : ticks_(0) {
+}
+// Platform-dependent tick count representing "right now."
+// The resolution of this clock is ~1-15ms.  Resolution varies depending
+// on hardware/operating system configuration.
+static TimeTicks Now();
+// Returns a platform-dependent high-resolution tick count. Implementation
+// is hardware dependent and may or may not return sub-millisecond
+// resolution.  THIS CALL IS GENERALLY MUCH MORE EXPENSIVE THAN Now() AND
+// SHOULD ONLY BE USED WHEN IT IS REALLY NEEDED.
+static TimeTicks HighResNow();
+// Returns true if this object has not been initialized.
+bool is_null() const {
+return ticks_ == 0;
+}
+// Returns the internal numeric value of the TimeTicks object.
+int64_t ToInternalValue() const {
+return ticks_;
+}
+TimeTicks& operator=(TimeTicks other) {
+ticks_ = other.ticks_;
+return *this;
+}
+// Compute the difference between two times.
+TimeDelta operator-(TimeTicks other) const {
+return TimeDelta(ticks_ - other.ticks_);
+}
+// Modify by some time delta.
+TimeTicks& operator+=(TimeDelta delta) {
+ticks_ += delta.delta_;
+return *this;
+}
+TimeTicks& operator-=(TimeDelta delta) {
+ticks_ -= delta.delta_;
+return *this;
+}
+// Return a new TimeTicks modified by some delta.
+TimeTicks operator+(TimeDelta delta) const {
+return TimeTicks(ticks_ + delta.delta_);
+}
+TimeTicks operator-(TimeDelta delta) const {
+return TimeTicks(ticks_ - delta.delta_);
+}
+// Comparison operators
+bool operator==(TimeTicks other) const {
+return ticks_ == other.ticks_;
+}
+bool operator!=(TimeTicks other) const {
+return ticks_ != other.ticks_;
+}
+bool operator<(TimeTicks other) const {
+return ticks_ < other.ticks_;
+}
+bool operator<=(TimeTicks other) const {
+return ticks_ <= other.ticks_;
+}
+bool operator>(TimeTicks other) const {
+return ticks_ > other.ticks_;
+}
+bool operator>=(TimeTicks other) const {
+return ticks_ >= other.ticks_;
+}
+protected:
+friend class TimeDelta;
+friend class PageLoadTrackerUnitTest;
+// Please use Now() to create a new object. This is for internal use
+// and testing. Ticks is in microseconds.
+explicit TimeTicks(int64_t ticks) : ticks_(ticks) {
+}
+// Tick count in microseconds.
+int64_t ticks_;
+#if defined(OS_WIN)
+typedef DWORD (*TickFunctionType)(void);
+static TickFunctionType SetMockTickFunction(TickFunctionType ticker);
+#endif
+};
+inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
+return TimeTicks(t.ticks_ + delta_);
+}
+}  // namespace base
+#endif  // BASE_TIME_H_

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comparison: ipc/chromium/src/base/time.h

ipc/chromium/src/base/time.h