PISystemTime Class Reference

System time. More...

Public Member Functions
	PISystemTime ()
	Contructs system time with s = ns = 0.
	PISystemTime (long s, long ns)
	Contructs system time with s = "s" and ns = "ns".
	PISystemTime (const PISystemTime &t)
	Contructs system time from another.
double	toSeconds () const
	Returns stored system time value in seconds.
double	toMilliseconds () const
	Returns stored system time value in milliseconds.
double	toMicroseconds () const
	Returns stored system time value in microseconds.
double	toNanoseconds () const
	Returns stored system time value in nanoseconds.
PISystemTime &	addSeconds (double v)
	Add to stored system time "v" seconds.
PISystemTime &	addMilliseconds (double v)
	Add to stored system time "v" milliseconds.
PISystemTime &	addMicroseconds (double v)
	Add to stored system time "v" microseconds.
PISystemTime &	addNanoseconds (double v)
	Add to stored system time "v" nanoseconds.
void	sleep ()
PISystemTime	abs () const
	Returns copy of this system time with absolutely values of s and ns.
PISystemTime	operator+ (const PISystemTime &t)
	Returns sum of this system time with "t".
PISystemTime	operator- (const PISystemTime &t)
	Returns difference between this system time and "t".
PISystemTime &	operator+= (const PISystemTime &t)
	Add to stored value system time "t".
PISystemTime &	operator-= (const PISystemTime &t)
	Subtract from stored value system time "t".
bool	operator== (const PISystemTime &t)
	Compare system times.
bool	operator!= (const PISystemTime &t)
	Compare system times.
bool	operator> (const PISystemTime &t)
	Compare system times.
bool	operator< (const PISystemTime &t)
	Compare system times.
bool	operator>= (const PISystemTime &t)
	Compare system times.
bool	operator<= (const PISystemTime &t)
	Compare system times.

Static Public Member Functions
static PISystemTime	fromSeconds (double v)
	Contructs system time from seconds "v".
static PISystemTime	fromMilliseconds (double v)
	Contructs system time from milliseconds "v".
static PISystemTime	fromMicroseconds (double v)
	Contructs system time from microseconds "v".
static PISystemTime	fromNanoseconds (double v)
	Contructs system time from nanoseconds "v".
static PISystemTime	current ()
	Returns current system time.

Public Attributes
long	seconds
	Seconds of stored system time.
long	nanoseconds
	Nanoseconds of stored system time.

Related Functions
(Note that these are not member functions.)
PISystemTime	currentSystemTime ()
	Returns current system time.

Detailed Description

System time.

Synopsis

This class provide arithmetic functions for POSIX system time. This time represents as seconds and nanosecons in integer formats. You can take current system time with function currentSystemTime(), compare times, sum or subtract two times, convert time to/from seconds, milliseconds, microseconds or nanoseconds.

Example

int main() {
    PISystemTime t0; // s = ns = 0
    t0.addMilliseconds(200); // s = 0, ns = 200000000
    t0.addMilliseconds(900); // s = 1, ns = 100000000
    t0 -= PISystemTime::fromSeconds(0.1); // s = 1, ns = 0
    t0.sleep(); // sleep for 1 second
    PISystemTime t1;
    t0 = currentSystemTime();
    piMSleep(500);
    t1 = currentSystemTime();
    (t1 - t0).sleep(); // sleep for 500 milliseconds
    return 0;
};

Member Function Documentation

void PISystemTime::sleep ( )

inline

Sleep for stored value.

Warning

Use this function to sleep for difference of system times or constructs system time. If you call this function on system time returned from currentSystemTime() thread will be sleep almost forever.