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Clean up the interface of TimeValue:
- get rid of unneeded constructors - get rid of duplicate methods/constructors/operators - normalize to LLVM coding standards - wrap to 80 columns. Many thanks to Alkis Evlogimenos for his suggestions. llvm-svn: 16514
This commit is contained in:
Reid Spencer
parent
78e20a7f60
commit
0dbad34203
@ -20,25 +20,27 @@ namespace llvm {
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namespace sys {
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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, actual
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/// precision of values will be determined by the resolution of the system clock.
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/// The TimeValue class is used in conjunction with several other lib/System
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/// interfaces to specify the time at which a call should timeout, etc.
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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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/// timeout, etc.
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/// @since 1.4
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/// @brief Provides an abstraction for a fixed point in time.
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class TimeValue {
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/// @name Constants
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/// @{
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public:
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/// A constant TimeValue representing the smallest time
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/// value permissable by the class. min_time is some point
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/// in the distant past, about 300 billion years BC.
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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. max_time is some point
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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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@ -48,12 +50,12 @@ namespace sys {
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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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/// 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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/// 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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@ -66,70 +68,47 @@ namespace sys {
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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,
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MICROSECONDS_PER_SECOND = 1000000,
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MILLISECONDS_PER_SECOND = 1000,
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NANOSECONDS_PER_MICROSECOND = 1000,
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NANOSECONDS_PER_MILLISECOND = 1000000,
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NANOSECONDS_PER_POSIX_TICK = 100,
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NANOSECONDS_PER_WIN32_TICK = 100,
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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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};
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/// @}
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/// @name Constructors
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/// @{
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public:
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/// Value is initialized to zero_time.
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/// @brief Default Constructor
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TimeValue ()
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: seconds_(0), nanos_(0) {}
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/// Caller provides the exact value in seconds and
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/// nano-seconds. The \p nsec argument defaults to
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/// zero for convenience.
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/// @brief Explicit Constructor.
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TimeValue (SecondsType seconds, NanoSecondsType nanos = 0)
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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 )
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, nanos_( nanos )
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{
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, 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->normalize();
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}
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/// Caller provides the exact value in in seconds with the
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/// fractional part represengin nanoseconds.
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/// @brief Double Constructor.
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TimeValue( double time )
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: seconds_( 0 ) , nanos_ ( 0 )
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{
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this->set( time );
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}
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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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/// Copies one TimeValue to another.
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/// @brief Copy Constructor.
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TimeValue( const TimeValue & that )
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: seconds_( that.seconds_ ) , nanos_( that.nanos_ ) { }
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//
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/// @}
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/// @name Operators
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/// @{
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public:
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/// Assigns the value of \p that TimeValue to \p this
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/// @brief Assignment operator.
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TimeValue& operator = ( const TimeValue& that ) {
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this->set( that );
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return *this;
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}
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/// Assigns the value of \p that floating point value to \p this.
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/// The \p that vlue is assumed to be in seconds format with
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/// the fraction indicating the number of nanoseconds.
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/// @brief Assignment operator.
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TimeValue& operator = ( double that ) {
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this->set( that );
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return *this;
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}
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/// Add \p that to \p this.
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/// @returns this
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/// @brief Incrementing assignment operator.
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@ -140,20 +119,6 @@ namespace sys {
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return *this;
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}
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/// Add \p addend to \p this. \p addend is assumed to be in seconds
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/// format with the fraction providing nanoseconds.
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/// @returns this
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/// @brief Incrementing assignment operator.
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TimeValue& operator += ( double addend ) {
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SecondsType seconds_part = static_cast<SecondsType>( addend );
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NanoSecondsType nanos_part = static_cast<NanoSecondsType>(
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(addend - static_cast<double>(seconds_part)) * NANOSECONDS_PER_SECOND );
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this->seconds_ += seconds_part;
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this->nanos_ += nanos_part;
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this->normalize();
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return *this;
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}
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/// Subtract \p that from \p this.
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/// @returns this
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/// @brief Decrementing assignment operator.
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@ -164,58 +129,51 @@ namespace sys {
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return *this;
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}
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/// Add \p that to \p this. \p that is assumed to be in seconds
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/// format with the fraction providing nanoseconds.
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/// @returns this
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/// @brief Decrementing assignment operator.
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TimeValue& operator -= ( double subtrahend ) {
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SecondsType seconds_part = static_cast<SecondsType>( subtrahend );
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NanoSecondsType nanos_part = static_cast<NanoSecondsType>(
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(subtrahend - static_cast<double>(seconds_part)) * NANOSECONDS_PER_SECOND );
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this->seconds_ -= seconds_part;
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this->nanos_ -= nanos_part;
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this->normalize();
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return *this;
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}
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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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{
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if ( this->seconds_ > that.seconds_ ) {
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return 1;
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}
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else if ( this->seconds_ == that.seconds_ )
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{
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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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}
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return 0;
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}
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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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{
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if ( this->seconds_ > that.seconds_ ) {
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return 1;
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}
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else if ( this->seconds_ == that.seconds_ )
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{
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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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}
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return 0;
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}
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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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}
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/// Determines if two TimeValue objects represent times that are not the
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/// same.
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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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@ -234,139 +192,145 @@ namespace sys {
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/// @{
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public:
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/// @brief Retrieve the seconds component
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SecondsType seconds( void ) const { return seconds_; }
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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( void ) const { return seconds_; }
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/// @brief Retrieve the nanoseconds component.
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NanoSecondsType nanoseconds( void ) const { return nanos_; }
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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( void ) const { return nanos_; }
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/// @brief Retrieve the fractional part as microseconds;
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uint32_t microseconds( void ) const {
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return nanos_ / NANOSECONDS_PER_MICROSECOND;
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}
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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( void ) const {
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return nanos_ / NANOSECONDS_PER_MICROSECOND;
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}
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/// @brief Retrieve the fractional part as milliseconds;
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uint32_t milliseconds( void ) const {
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return nanos_ / NANOSECONDS_PER_MILLISECOND;
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}
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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( void ) const {
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return nanos_ / NANOSECONDS_PER_MILLISECOND;
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}
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/// @brief Convert to a number of microseconds (can overflow)
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uint64_t usec( void ) const {
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return seconds_ * MICROSECONDS_PER_SECOND +
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( nanos_ / NANOSECONDS_PER_MICROSECOND );
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}
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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( void ) const {
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return seconds_ * MICROSECONDS_PER_SECOND +
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( nanos_ / NANOSECONDS_PER_MICROSECOND );
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}
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/// @brief Convert to a number of milliseconds (can overflow)
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uint64_t msec( void ) const {
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return seconds_ * MILLISECONDS_PER_SECOND + ( nanos_ / NANOSECONDS_PER_MILLISECOND );
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}
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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( void ) const {
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return seconds_ * MILLISECONDS_PER_SECOND +
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( nanos_ / NANOSECONDS_PER_MILLISECOND );
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}
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/// @brief Convert to unix time (100 nanoseconds since 12:00:00a Jan 1, 1970)
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uint64_t posix_time( void ) 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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return result;
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}
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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( void ) 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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return result;
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}
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/// @brief Convert to windows time (seconds since 12:00:00a Jan 1, 1601)
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uint64_t win32_time( void ) 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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return result;
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}
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/// Converts the TiemValue into the correspodning 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( void ) 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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return result;
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}
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/// @brief Convert to timespec time (ala POSIX.1b)
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void timespecTime( uint64_t& seconds, uint32_t& nanos ) const {
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nanos = nanos_;
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seconds = seconds_ - PosixZeroTime.seconds_;
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}
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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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nanos = nanos_;
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}
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/// @}
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/// @name Mutators
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/// @{
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/// @brief Set a TimeValue from the two component values.
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void set (SecondsType secs, NanoSecondsType nanos) {
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this->seconds_ = secs;
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this->nanos_ = nanos;
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this->normalize();
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}
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public:
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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 arithmetic.
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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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this->normalize();
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}
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/// @brief Set a TimeValue from another
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void set ( const TimeValue & that ) {
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this->seconds_ = that.seconds_;
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this->nanos_ = that.nanos_;
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}
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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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this->normalize();
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}
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/// The double value is assumed to be in seconds format, with any
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/// remainder treated as nanoseconds.
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/// @brief Set a TimeValue from a double.
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void set (double new_time) {
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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 - static_cast<double>(integer_part)) * NANOSECONDS_PER_SECOND );
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this->normalize();
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}
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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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this->normalize();
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};
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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 arithmetic.
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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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this->normalize();
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}
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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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this->normalize();
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};
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/// The seconds component remains unchanged.
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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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this->normalize();
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}
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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_ = (microseconds % MICROSECONDS_PER_SECOND) *
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NANOSECONDS_PER_MICROSECOND;
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this->normalize();
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}
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/// The seconds component remains unchanged.
|
||||
/// @brief Set the nanoseconds component using a number of microseconds.
|
||||
void microseconds ( int32_t micros ) {
|
||||
this->nanos_ = micros * NANOSECONDS_PER_MICROSECOND;
|
||||
this->normalize();
|
||||
};
|
||||
|
||||
/// The seconds component remains unchanged.
|
||||
/// @brief Set the nanoseconds component using a number of milliseconds.
|
||||
void milliseconds ( int32_t millis ) {
|
||||
this->nanos_ = millis * NANOSECONDS_PER_MILLISECOND;
|
||||
this->normalize();
|
||||
};
|
||||
|
||||
/// @brief Converts from microsecond format to TimeValue format
|
||||
void usec( int64_t microseconds ) {
|
||||
this->seconds_ = microseconds / MICROSECONDS_PER_SECOND;
|
||||
this->nanos_ = (microseconds % MICROSECONDS_PER_SECOND) *
|
||||
NANOSECONDS_PER_MICROSECOND;
|
||||
this->normalize();
|
||||
}
|
||||
|
||||
/// @brief Converts from millisecond format to TimeValue format
|
||||
void msec( int64_t milliseconds ) {
|
||||
this->seconds_ = milliseconds / MILLISECONDS_PER_SECOND;
|
||||
this->nanos_ = (milliseconds % MILLISECONDS_PER_SECOND) *
|
||||
NANOSECONDS_PER_MILLISECOND;
|
||||
this->normalize();
|
||||
}
|
||||
|
||||
/// This causes the values to be represented so that the fractional
|
||||
/// part is minimized, possibly incrementing the seconds part.
|
||||
/// @brief Normalize to canonical form.
|
||||
void normalize (void);
|
||||
|
||||
/// @brief Sets \p this to the current time (UTC).
|
||||
void now( void );
|
||||
/// @brief Converts from millisecond format to TimeValue format
|
||||
void msec( int64_t milliseconds ) {
|
||||
this->seconds_ = milliseconds / MILLISECONDS_PER_SECOND;
|
||||
this->nanos_ = (milliseconds % MILLISECONDS_PER_SECOND) *
|
||||
NANOSECONDS_PER_MILLISECOND;
|
||||
this->normalize();
|
||||
}
|
||||
|
||||
/// @}
|
||||
/// @name Implementation
|
||||
/// @{
|
||||
private:
|
||||
/// This causes the values to be represented so that the fractional
|
||||
/// part is minimized, possibly incrementing the seconds part.
|
||||
/// @brief Normalize to canonical form.
|
||||
void normalize (void);
|
||||
|
||||
/// @}
|
||||
/// @name Data
|
||||
/// @{
|
||||
private:
|
||||
/// Store the values as a <timeval>.
|
||||
SecondsType seconds_; ///< Stores the seconds component of the TimeVal
|
||||
NanoSecondsType nanos_; ///< Stores the nanoseconds component of the TimeVal
|
||||
SecondsType seconds_;///< Stores the seconds part of the TimeVal
|
||||
NanoSecondsType nanos_; ///< Stores the nanoseconds part of the TimeVal
|
||||
|
||||
/// @}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user