// 
// 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.
// 
// clock -- 
// 
// Author           : Peter A. Buhr
// Created On       : Thu Apr 12 14:36:06 2018
// Last Modified By : Peter A. Buhr
// Last Modified On : Mon Jul  2 21:40:01 2018
// Update Count     : 7
// 

#include <time>


//######################### C time #########################

static inline char * ctime( time_t tp ) { char * buf = ctime( &tp ); buf[24] = '\0'; return buf; }
static inline char * ctime_r( time_t tp, char * buf ) { ctime_r( &tp, buf ); buf[24] = '\0'; return buf; }
static inline tm * gmtime( time_t tp ) { return gmtime( &tp ); }
static inline tm * gmtime_r( time_t tp, tm * result ) { return gmtime_r( &tp, result ); }
static inline tm * localtime( time_t tp ) { return localtime( &tp ); }
static inline tm * localtime_r( time_t tp, tm * result ) { return localtime_r( &tp, result ); }


//######################### Clock #########################

struct Clock {											// private
	Duration offset;									// for virtual clock: contains offset from real-time
	int clocktype;										// implementation only -1 (virtual), CLOCK_REALTIME
};

static inline {
	void resetClock( Clock & clk ) with( clk ) {
		clocktype = CLOCK_REALTIME_COARSE;
	} // Clock::resetClock

	void resetClock( Clock & clk, Duration adj ) with( clk ) {
		clocktype = -1;
		offset = adj + __timezone`s;					// timezone (global) is (UTC - local time) in seconds
	} // resetClock

	void ?{}( Clock & clk ) { resetClock( clk ); }
	void ?{}( Clock & clk, Duration adj ) { resetClock( clk, adj ); }

	Duration getResNsec() {
		struct timespec res;
		clock_getres( CLOCK_REALTIME, &res );
		return ((int64_t)res.tv_sec * TIMEGRAN + res.tv_nsec)`ns;
	} // getRes

	Duration getRes() {
		struct timespec res;
		clock_getres( CLOCK_REALTIME_COARSE, &res );
		return ((int64_t)res.tv_sec * TIMEGRAN + res.tv_nsec)`ns;
	} // getRes

	Time getTimeNsec() {								// with nanoseconds
		timespec curr;
		clock_gettime( CLOCK_REALTIME, &curr );
		return (Time){ curr };
	} // getTime

	Time getTime() {									// without nanoseconds
		timespec curr;
		clock_gettime( CLOCK_REALTIME_COARSE, &curr );
		curr.tv_nsec = 0;
		return (Time){ curr };
	} // getTime

	Time getTime( Clock & clk ) with( clk ) {
		return getTime() + offset;
	} // getTime

	Time ?()( Clock & clk ) with( clk ) {				// alternative syntax
		return getTime() + offset;
	} // getTime

	timeval getTime( Clock & clk ) {
		return (timeval){ clk() };
	} // getTime

	tm getTime( Clock & clk ) with( clk ) {
		tm ret;
		localtime_r( getTime( clk ).tv_sec, &ret );
		return ret;
	} // getTime
} // distribution

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