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//===-- TimeValue.h - Declare OS TimeValue Concept --------------*- C++ -*-===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This header file declares the operating system TimeValue concept.
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//===----------------------------------------------------------------------===//
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#include "llvm/System/DataTypes.h"
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#ifndef LLVM_SYSTEM_TIMEVALUE_H
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#define LLVM_SYSTEM_TIMEVALUE_H
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/// This class is used where a precise fixed point in time is required. The
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/// range of TimeValue spans many hundreds of billions of years both past and
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/// present. The precision of TimeValue is to the nanosecond. However, the
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/// actual precision of its values will be determined by the resolution of
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/// the system clock. The TimeValue class is used in conjunction with several
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/// other lib/System interfaces to specify the time at which a call should
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/// @brief Provides an abstraction for a fixed point in time.
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/// A constant TimeValue representing the smallest time
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/// value permissable by the class. MinTime is some point
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/// in the distant past, about 300 billion years BCE.
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/// @brief The smallest possible time value.
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static const TimeValue MinTime;
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/// A constant TimeValue representing the largest time
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/// value permissable by the class. MaxTime is some point
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/// in the distant future, about 300 billion years AD.
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/// @brief The largest possible time value.
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static const TimeValue MaxTime;
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/// A constant TimeValue representing the base time,
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/// or zero time of 00:00:00 (midnight) January 1st, 2000.
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/// @brief 00:00:00 Jan 1, 2000 UTC.
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static const TimeValue ZeroTime;
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/// A constant TimeValue for the Posix base time which is
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/// 00:00:00 (midnight) January 1st, 1970.
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/// @brief 00:00:00 Jan 1, 1970 UTC.
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static const TimeValue PosixZeroTime;
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/// A constant TimeValue for the Win32 base time which is
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/// 00:00:00 (midnight) January 1st, 1601.
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/// @brief 00:00:00 Jan 1, 1601 UTC.
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static const TimeValue Win32ZeroTime;
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typedef int64_t SecondsType; ///< Type used for representing seconds.
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typedef int32_t NanoSecondsType;///< Type used for representing nanoseconds.
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enum TimeConversions {
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NANOSECONDS_PER_SECOND = 1000000000, ///< One Billion
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MICROSECONDS_PER_SECOND = 1000000, ///< One Million
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MILLISECONDS_PER_SECOND = 1000, ///< One Thousand
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NANOSECONDS_PER_MICROSECOND = 1000, ///< One Thousand
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NANOSECONDS_PER_MILLISECOND = 1000000,///< One Million
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NANOSECONDS_PER_POSIX_TICK = 100, ///< Posix tick is 100 Hz (10ms)
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NANOSECONDS_PER_WIN32_TICK = 100 ///< Win32 tick is 100 Hz (10ms)
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/// @name Constructors
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/// Caller provides the exact value in seconds and nanoseconds. The
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/// \p nanos argument defaults to zero for convenience.
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/// @brief Explicit constructor
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explicit TimeValue (SecondsType seconds, NanoSecondsType nanos = 0)
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: seconds_( seconds ), nanos_( nanos ) { this->normalize(); }
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/// Caller provides the exact value as a double in seconds with the
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/// fractional part representing nanoseconds.
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/// @brief Double Constructor.
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explicit TimeValue( double new_time )
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: seconds_( 0 ) , nanos_ ( 0 ) {
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SecondsType integer_part = static_cast<SecondsType>( new_time );
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seconds_ = integer_part;
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nanos_ = static_cast<NanoSecondsType>( (new_time -
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static_cast<double>(integer_part)) * NANOSECONDS_PER_SECOND );
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/// This is a static constructor that returns a TimeValue that represents
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/// the current time.
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/// @brief Creates a TimeValue with the current time (UTC).
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static TimeValue now();
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/// Add \p that to \p this.
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/// @brief Incrementing assignment operator.
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TimeValue& operator += (const TimeValue& that ) {
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this->seconds_ += that.seconds_ ;
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this->nanos_ += that.nanos_ ;
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/// Subtract \p that from \p this.
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/// @brief Decrementing assignment operator.
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TimeValue& operator -= (const TimeValue &that ) {
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this->seconds_ -= that.seconds_ ;
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this->nanos_ -= that.nanos_ ;
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/// Determine if \p this is less than \p that.
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/// @returns True iff *this < that.
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/// @brief True if this < that.
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int operator < (const TimeValue &that) const { return that > *this; }
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/// Determine if \p this is greather than \p that.
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/// @returns True iff *this > that.
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/// @brief True if this > that.
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int operator > (const TimeValue &that) const {
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if ( this->seconds_ > that.seconds_ ) {
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} else if ( this->seconds_ == that.seconds_ ) {
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if ( this->nanos_ > that.nanos_ ) return 1;
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/// Determine if \p this is less than or equal to \p that.
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/// @returns True iff *this <= that.
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/// @brief True if this <= that.
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int operator <= (const TimeValue &that) const { return that >= *this; }
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/// Determine if \p this is greater than or equal to \p that.
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/// @returns True iff *this >= that.
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/// @brief True if this >= that.
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int operator >= (const TimeValue &that) const {
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if ( this->seconds_ > that.seconds_ ) {
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} else if ( this->seconds_ == that.seconds_ ) {
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if ( this->nanos_ >= that.nanos_ ) return 1;
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/// Determines if two TimeValue objects represent the same moment in time.
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/// @brief True iff *this == that.
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/// @brief True if this == that.
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int operator == (const TimeValue &that) const {
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return (this->seconds_ == that.seconds_) &&
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(this->nanos_ == that.nanos_);
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/// Determines if two TimeValue objects represent times that are not the
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/// @return True iff *this != that.
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/// @brief True if this != that.
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int operator != (const TimeValue &that) const { return !(*this == that); }
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/// Adds two TimeValue objects together.
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/// @returns The sum of the two operands as a new TimeValue
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/// @brief Addition operator.
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friend TimeValue operator + (const TimeValue &tv1, const TimeValue &tv2);
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/// Subtracts two TimeValue objects.
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/// @returns The difference of the two operands as a new TimeValue
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/// @brief Subtraction operator.
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friend TimeValue operator - (const TimeValue &tv1, const TimeValue &tv2);
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/// Returns only the seconds component of the TimeValue. The nanoseconds
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/// portion is ignored. No rounding is performed.
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/// @brief Retrieve the seconds component
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SecondsType seconds() const { return seconds_; }
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/// Returns only the nanoseconds component of the TimeValue. The seconds
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/// portion is ignored.
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/// @brief Retrieve the nanoseconds component.
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NanoSecondsType nanoseconds() const { return nanos_; }
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/// Returns only the fractional portion of the TimeValue rounded down to the
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/// nearest microsecond (divide by one thousand).
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/// @brief Retrieve the fractional part as microseconds;
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uint32_t microseconds() const {
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return nanos_ / NANOSECONDS_PER_MICROSECOND;
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/// Returns only the fractional portion of the TimeValue rounded down to the
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/// nearest millisecond (divide by one million).
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/// @brief Retrieve the fractional part as milliseconds;
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uint32_t milliseconds() const {
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return nanos_ / NANOSECONDS_PER_MILLISECOND;
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/// Returns the TimeValue as a number of microseconds. Note that the value
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/// returned can overflow because the range of a uint64_t is smaller than
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/// the range of a TimeValue. Nevertheless, this is useful on some operating
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/// systems and is therefore provided.
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/// @brief Convert to a number of microseconds (can overflow)
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uint64_t usec() const {
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return seconds_ * MICROSECONDS_PER_SECOND +
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( nanos_ / NANOSECONDS_PER_MICROSECOND );
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/// Returns the TimeValue as a number of milliseconds. Note that the value
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/// returned can overflow because the range of a uint64_t is smaller than
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/// the range of a TimeValue. Nevertheless, this is useful on some operating
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/// systems and is therefore provided.
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/// @brief Convert to a number of milliseconds (can overflow)
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uint64_t msec() const {
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return seconds_ * MILLISECONDS_PER_SECOND +
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( nanos_ / NANOSECONDS_PER_MILLISECOND );
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/// Converts the TimeValue into the corresponding number of "ticks" for
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/// Posix, correcting for the difference in Posix zero time.
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/// @brief Convert to unix time (100 nanoseconds since 12:00:00a Jan 1,1970)
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uint64_t toPosixTime() const {
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uint64_t result = seconds_ - PosixZeroTime.seconds_;
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result += nanos_ / NANOSECONDS_PER_POSIX_TICK;
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/// Converts the TimeValue into the corresponding number of seconds
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/// since the epoch (00:00:00 Jan 1,1970).
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uint64_t toEpochTime() const {
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return seconds_ - PosixZeroTime.seconds_;
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/// Converts the TimeValue into the corresponding number of "ticks" for
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/// Win32 platforms, correcting for the difference in Win32 zero time.
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/// @brief Convert to windows time (seconds since 12:00:00a Jan 1, 1601)
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uint64_t toWin32Time() const {
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uint64_t result = seconds_ - Win32ZeroTime.seconds_;
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result += nanos_ / NANOSECONDS_PER_WIN32_TICK;
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/// Provides the seconds and nanoseconds as results in its arguments after
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/// correction for the Posix zero time.
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/// @brief Convert to timespec time (ala POSIX.1b)
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void getTimespecTime( uint64_t& seconds, uint32_t& nanos ) const {
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seconds = seconds_ - PosixZeroTime.seconds_;
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/// Provides conversion of the TimeValue into a readable time & date.
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/// @returns std::string containing the readable time value
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/// @brief Convert time to a string.
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std::string str() const;
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/// The seconds component of the TimeValue is set to \p sec without
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/// modifying the nanoseconds part. This is useful for whole second
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/// @brief Set the seconds component.
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void seconds (SecondsType sec ) {
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this->seconds_ = sec;
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/// The nanoseconds component of the TimeValue is set to \p nanos without
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/// modifying the seconds part. This is useful for basic computations
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/// involving just the nanoseconds portion. Note that the TimeValue will be
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/// normalized after this call so that the fractional (nanoseconds) portion
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/// will have the smallest equivalent value.
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/// @brief Set the nanoseconds component using a number of nanoseconds.
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void nanoseconds ( NanoSecondsType nanos ) {
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this->nanos_ = nanos;
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/// The seconds component remains unchanged.
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/// @brief Set the nanoseconds component using a number of microseconds.
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void microseconds ( int32_t micros ) {
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this->nanos_ = micros * NANOSECONDS_PER_MICROSECOND;
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/// The seconds component remains unchanged.
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/// @brief Set the nanoseconds component using a number of milliseconds.
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void milliseconds ( int32_t millis ) {
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this->nanos_ = millis * NANOSECONDS_PER_MILLISECOND;
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/// @brief Converts from microsecond format to TimeValue format
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void usec( int64_t microseconds ) {
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this->seconds_ = microseconds / MICROSECONDS_PER_SECOND;
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this->nanos_ = NanoSecondsType(microseconds % MICROSECONDS_PER_SECOND) *
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NANOSECONDS_PER_MICROSECOND;
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/// @brief Converts from millisecond format to TimeValue format
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void msec( int64_t milliseconds ) {
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this->seconds_ = milliseconds / MILLISECONDS_PER_SECOND;
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this->nanos_ = NanoSecondsType(milliseconds % MILLISECONDS_PER_SECOND) *
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NANOSECONDS_PER_MILLISECOND;
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/// Converts the \p seconds argument from PosixTime to the corresponding
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/// TimeValue and assigns that value to \p this.
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/// @brief Convert seconds form PosixTime to TimeValue
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void fromEpochTime( SecondsType seconds ) {
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seconds_ = seconds + PosixZeroTime.seconds_;
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/// Converts the \p win32Time argument from Windows FILETIME to the
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/// corresponding TimeValue and assigns that value to \p this.
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/// @brief Convert seconds form Windows FILETIME to TimeValue
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void fromWin32Time( uint64_t win32Time ) {
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this->seconds_ = win32Time / 10000000 + Win32ZeroTime.seconds_;
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this->nanos_ = NanoSecondsType(win32Time % 10000000) * 100;
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/// @name Implementation
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/// This causes the values to be represented so that the fractional
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/// part is minimized, possibly incrementing the seconds part.
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/// @brief Normalize to canonical form.
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/// Store the values as a <timeval>.
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SecondsType seconds_;///< Stores the seconds part of the TimeVal
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NanoSecondsType nanos_; ///< Stores the nanoseconds part of the TimeVal
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inline TimeValue operator + (const TimeValue &tv1, const TimeValue &tv2) {
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TimeValue sum (tv1.seconds_ + tv2.seconds_, tv1.nanos_ + tv2.nanos_);
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inline TimeValue operator - (const TimeValue &tv1, const TimeValue &tv2) {
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TimeValue difference (tv1.seconds_ - tv2.seconds_, tv1.nanos_ - tv2.nanos_ );
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difference.normalize ();