source: src/libcfa/time @ 2472a19

// 
// Cforall Version 1.0.0 Copyright (C) 2018 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
// 
// time -- 
// 
// Author           : Peter A. Buhr
// Created On       : Wed Mar 14 23:18:57 2018
// Last Modified By : Peter A. Buhr
// Last Modified On : Sat Apr 14 17:48:23 2018
// Update Count     : 636
// 

#pragma once

// http://en.cppreference.com/w/cpp/header/chrono
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r5.html#refcc

#include <time.h>                                                                               // timespec
extern "C" {
#include <sys/time.h>                                                                   // timeval
}
#include <time_t.h>                                                                             // Duration/Time types

enum { TIMEGRAN = 1_000_000_000LL };                                    // nanosecond granularity, except for timeval


//######################### Duration #########################

static inline Duration ?=?( Duration & dur, zero_t ) { return dur{ 0 }; }

static inline Duration +?( Duration rhs ) with( rhs ) { return (Duration)@{ +tv }; }
static inline Duration ?+?( Duration & lhs, Duration rhs ) { return (Duration)@{ lhs.tv + rhs.tv }; }
static inline Duration ?+=?( Duration & lhs, Duration rhs ) { lhs = lhs + rhs; return lhs; }

static inline Duration -?( Duration rhs ) with( rhs ) { return (Duration)@{ -tv }; }
static inline Duration ?-?( Duration & lhs, Duration rhs ) { return (Duration)@{ lhs.tv - rhs.tv }; }
static inline Duration ?-=?( Duration & lhs, Duration rhs ) { lhs = lhs - rhs; return lhs; }

static inline Duration ?*?( Duration lhs, int64_t rhs ) { return (Duration)@{ lhs.tv * rhs }; }
static inline Duration ?*?( int64_t lhs, Duration rhs ) { return (Duration)@{ lhs * rhs.tv }; }
static inline Duration ?*=?( Duration & lhs, int64_t rhs ) { lhs = lhs * rhs; return lhs; }

static inline int64_t ?/?( Duration lhs, Duration rhs ) { return lhs.tv / rhs.tv; }
static inline Duration ?/?( Duration lhs, int64_t rhs ) { return (Duration)@{ lhs.tv / rhs }; }
static inline Duration ?/=?( Duration & lhs, int64_t rhs ) { lhs = lhs / rhs; return lhs; }
static inline double div( Duration lhs, Duration rhs ) { return (double)lhs.tv / (double)rhs.tv; }

static inline Duration ?%?( Duration lhs, Duration rhs ) { return (Duration)@{ lhs.tv % rhs.tv }; }
static inline Duration ?%=?( Duration & lhs, Duration rhs ) { lhs = lhs % rhs; return lhs; }

static inline _Bool ?==?( Duration lhs, Duration rhs ) { return lhs.tv == rhs.tv; }
static inline _Bool ?!=?( Duration lhs, Duration rhs ) { return lhs.tv != rhs.tv; }
static inline _Bool ?<? ( Duration lhs, Duration rhs ) { return lhs.tv <  rhs.tv; }
static inline _Bool ?<=?( Duration lhs, Duration rhs ) { return lhs.tv <= rhs.tv; }
static inline _Bool ?>? ( Duration lhs, Duration rhs ) { return lhs.tv >  rhs.tv; }
static inline _Bool ?>=?( Duration lhs, Duration rhs ) { return lhs.tv >= rhs.tv; }

static inline _Bool ?==?( Duration lhs, zero_t ) { return lhs.tv == 0; }
static inline _Bool ?!=?( Duration lhs, zero_t ) { return lhs.tv != 0; }
static inline _Bool ?<? ( Duration lhs, zero_t ) { return lhs.tv <  0; }
static inline _Bool ?<=?( Duration lhs, zero_t ) { return lhs.tv <= 0; }
static inline _Bool ?>? ( Duration lhs, zero_t ) { return lhs.tv >  0; }
static inline _Bool ?>=?( Duration lhs, zero_t ) { return lhs.tv >= 0; }

static inline Duration abs( Duration rhs ) { return rhs.tv >= 0 ? rhs : -rhs; }

static inline Duration ?`ns( int64_t nsec ) { return (Duration)@{ nsec }; }
static inline Duration ?`us( int64_t usec ) { return (Duration)@{ usec * (TIMEGRAN / 1_000_000LL) }; }
static inline Duration ?`ms( int64_t msec ) { return (Duration)@{ msec * (TIMEGRAN / 1_000LL) }; }
static inline Duration ?`s( int64_t sec ) { return (Duration)@{ sec * TIMEGRAN }; }
static inline Duration ?`s( double sec ) { return (Duration)@{ sec * TIMEGRAN }; }
static inline Duration ?`m( int64_t min ) { return (Duration)@{ min * (60LL * TIMEGRAN) }; }
static inline Duration ?`m( double min ) { return (Duration)@{ min * (60LL * TIMEGRAN) }; }
static inline Duration ?`h( int64_t hours ) { return (Duration)@{ hours * (60LL * 60LL * TIMEGRAN) }; }
static inline Duration ?`h( double hours ) { return (Duration)@{ hours * (60LL * 60LL * TIMEGRAN) }; }
static inline Duration ?`d( int64_t days ) { return (Duration)@{ days * (24LL * 60LL * 60LL * TIMEGRAN) }; }
static inline Duration ?`d( double days ) { return (Duration)@{ days * (24LL * 60LL * 60LL * TIMEGRAN) }; }
static inline Duration ?`w( int64_t weeks ) { return (Duration)@{ weeks * (7LL * 24LL * 60LL * 60LL * TIMEGRAN) }; }
static inline Duration ?`w( double weeks ) { return (Duration)@{ weeks * (7LL * 24LL * 60LL * 60LL * TIMEGRAN) }; }

static inline int64_t ?`ns( Duration dur ) { return dur.tv; }
static inline int64_t ?`us( Duration dur ) { return dur.tv / (TIMEGRAN / 1_000_000LL); }
static inline int64_t ?`ms( Duration dur ) { return dur.tv / (TIMEGRAN / 1_000LL); }
static inline int64_t ?`s( Duration dur ) { return dur.tv / TIMEGRAN; }
static inline int64_t ?`m( Duration dur ) { return dur.tv / (60LL * TIMEGRAN); }
static inline int64_t ?`h( Duration dur ) { return dur.tv / (60LL * 60LL * TIMEGRAN); }
static inline int64_t ?`d( Duration dur ) { return dur.tv / (24LL * 60LL * 60LL * TIMEGRAN); }
static inline int64_t ?`w( Duration dur ) { return dur.tv / (7LL * 24LL * 60LL * 60LL * TIMEGRAN); }


//######################### C timeval #########################

static inline void ?{}( timeval & t ) {}
static inline void ?{}( timeval & t, time_t sec, suseconds_t usec ) { t.tv_sec = sec; t.tv_usec = usec; }
static inline void ?{}( timeval & t, time_t sec ) { t{ sec, 0 }; }
static inline void ?{}( timeval & t, zero_t ) { t{ 0, 0 }; }
static inline timeval ?=?( timeval & t, zero_t ) { return t{ 0 }; }
static inline timeval ?+?( timeval & lhs, timeval rhs ) { return (timeval)@{ lhs.tv_sec + rhs.tv_sec, lhs.tv_usec + rhs.tv_usec }; }
static inline timeval ?-?( timeval & lhs, timeval rhs ) { return (timeval)@{ lhs.tv_sec - rhs.tv_sec, lhs.tv_usec - rhs.tv_usec }; }
static inline _Bool ?==?( timeval lhs, timeval rhs ) { return lhs.tv_sec == rhs.tv_sec && lhs.tv_usec == rhs.tv_usec; }
static inline _Bool ?!=?( timeval lhs, timeval rhs ) { return lhs.tv_sec != rhs.tv_sec || lhs.tv_usec != rhs.tv_usec; }


//######################### C timespec #########################

static inline void ?{}( timespec & t ) {}
static inline void ?{}( timespec & t, time_t sec, __syscall_slong_t nsec ) { t.tv_sec = sec; t.tv_nsec = nsec; }
static inline void ?{}( timespec & t, time_t sec ) { t{ sec, 0}; }
static inline void ?{}( timespec & t, zero_t ) { t{ 0, 0 }; }
static inline timespec ?=?( timespec & t, zero_t ) { return t{ 0 }; }
static inline timespec ?+?( timespec & lhs, timespec rhs ) { return (timespec)@{ lhs.tv_sec + rhs.tv_sec, lhs.tv_nsec + rhs.tv_nsec }; }
static inline timespec ?-?( timespec & lhs, timespec rhs ) { return (timespec)@{ lhs.tv_sec - rhs.tv_sec, lhs.tv_nsec - rhs.tv_nsec }; }
static inline _Bool ?==?( timespec lhs, timespec rhs ) { return lhs.tv_sec == rhs.tv_sec && lhs.tv_nsec == rhs.tv_nsec; }
static inline _Bool ?!=?( timespec lhs, timespec rhs ) { return lhs.tv_sec != rhs.tv_sec || lhs.tv_nsec != rhs.tv_nsec; }


//######################### C itimerval #########################

static inline void ?{}( itimerval & itv, Duration alarm ) with( itv ) {
        // itimerval contains durations but but uses time data-structure timeval.
        it_value{ alarm`s, (alarm % 1`s)`us };                          // seconds, microseconds
        it_interval{ 0 };                                                                       // 0 seconds, 0 microseconds
} // itimerval

static inline void ?{}( itimerval & itv, Duration alarm, Duration interval ) with( itv ) {
        // itimerval contains durations but but uses time data-structure timeval.
        it_value{ alarm`s, (alarm % 1`s)`us };                          // seconds, microseconds
        it_interval{ interval`s, interval`us };                         // seconds, microseconds
} // itimerval


//######################### Time #########################

void ?{}( Time & time, int year, int month = 0, int day = 0, int hour = 0, int min = 0, int sec = 0, int nsec = 0 );
static inline Time ?=?( Time & time, zero_t ) { return time{ 0 }; }

static inline void ?{}( Time & time, timeval t ) with( time ) { tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_usec * 1000; }
static inline Time ?=?( Time & time, timeval t ) with( time ) {
        tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_usec * (TIMEGRAN / 1_000_000LL);
        return time;
} // ?=?

static inline void ?{}( Time & time, timespec t ) with( time ) { tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_nsec; }
static inline Time ?=?( Time & time, timespec t ) with( time ) {
        tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_nsec;
        return time;
} // ?=?

static inline Time ?+?( Time & lhs, Duration rhs ) { return (Time)@{ lhs.tv + rhs.tv }; }
static inline Time ?+?( Duration lhs, Time rhs ) { return rhs + lhs; }
static inline Time ?+=?( Time & lhs, Duration rhs ) { lhs = lhs + rhs; return lhs; }

static inline Duration ?-?( Time lhs, Time rhs ) { return (Duration)@{ lhs.tv - rhs.tv }; }
static inline Time ?-?( Time lhs, Duration rhs ) { return (Time)@{ lhs.tv - rhs.tv }; }
static inline Time ?-=?( Time & lhs, Duration rhs ) { lhs = lhs - rhs; return lhs; }
static inline _Bool ?==?( Time lhs, Time rhs ) { return lhs.tv == rhs.tv; }
static inline _Bool ?!=?( Time lhs, Time rhs ) { return lhs.tv != rhs.tv; }
static inline _Bool ?<?( Time lhs, Time rhs ) { return lhs.tv < rhs.tv; }
static inline _Bool ?<=?( Time lhs, Time rhs ) { return lhs.tv <= rhs.tv; }
static inline _Bool ?>?( Time lhs, Time rhs ) { return lhs.tv > rhs.tv; }
static inline _Bool ?>=?( Time lhs, Time rhs ) { return lhs.tv >= rhs.tv; }

char * yy_mm_dd( Time time, char * buf );
static inline char * ?`ymd( Time time, char * buf ) {   // short form
        return yy_mm_dd( time, buf );
} // ymd

char * mm_dd_yy( Time time, char * buf );
static inline char * ?`mdy( Time time, char * buf ) {   // short form
        return mm_dd_yy( time, buf );
} // mdy

char * dd_mm_yy( Time time, char * buf );
static inline char * ?`dmy( Time time, char * buf ) {   // short form
        return dd_mm_yy( time, buf );;
} // dmy

size_t strftime( char * buf, size_t size, const char * fmt, Time time );

//------------------------- timeval (cont) -------------------------

static inline void ?{}( timeval & t, Time time ) with( t, time ) {
        tv_sec = tv / TIMEGRAN;                                                         // seconds
        tv_usec = tv % TIMEGRAN / (TIMEGRAN / 1_000_000LL);     // microseconds
} // ?{}

//------------------------- timespec (cont) -------------------------

static inline void ?{}( timespec & t, Time time ) with( t, time ) {
        tv_sec = tv / TIMEGRAN;                                                         // seconds
        tv_nsec = tv % TIMEGRAN;                                                        // nanoseconds
} // ?{}

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