summaryrefslogtreecommitdiffstats
path: root/ipc/chromium/src/base/time.h
diff options
context:
space:
mode:
authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /ipc/chromium/src/base/time.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
downloadUXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip
Add m-esr52 at 52.6.0
Diffstat (limited to 'ipc/chromium/src/base/time.h')
-rw-r--r--ipc/chromium/src/base/time.h486
1 files changed, 486 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/time.h b/ipc/chromium/src/base/time.h
new file mode 100644
index 000000000..55bc7b451
--- /dev/null
+++ b/ipc/chromium/src/base/time.h
@@ -0,0 +1,486 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// 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 Time(us_ + delta.delta_);
+ }
+ Time operator-(TimeDelta delta) const {
+ return Time(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);
+
+ explicit 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_