shithub: sl

ref: 586508d8b8b602bc87b8b7ed5d21c68d522d9e78
dir: /src/plan9/sys.c/

#include "flisp.h"
#include "timefuncs.h"
#include <tos.h>

#define Nsec 1000000000ULL

double D_PNAN, D_PINF;

double
sec_realtime(void)
{
	uvlong t = nsec();
	uvlong ns = t % Nsec;
	uvlong s = (t - ns) / Nsec;
	return (double)s + (double)ns/1.0e9;
}

/*
 * nsec() is wallclock and can be adjusted by timesync
 * so need to use cycles() instead, but fall back to
 * nsec() in case we can't
 */
u64int
nanosec_monotonic(void)
{
	static u64int fasthz, xstart;
	u64int x;

	if(fasthz == ~0ULL)
		return nsec() - xstart;

	if(fasthz == 0){
		if(_tos->cyclefreq){
			fasthz = _tos->cyclefreq;
			cycles(&xstart);
		} else {
			fasthz = ~0ULL;
			xstart = nsec();
		}
		return 0;
	}
	cycles(&x);
	x -= xstart;

	u64int q = x / fasthz;
	u64int r = x % fasthz;

	return q*Nsec + r*Nsec/fasthz;
}

void
timestring(double s, char *buf, int sz)
{
	Tm tm;
	snprint(buf, sz, "%τ", tmfmt(tmtime(&tm, s, tzload("local")), nil));
}

double
parsetime(const char *s)
{
	Tm tm;
	if(tmparse(&tm, "?WWW, ?MM ?DD hh:mm:ss ?Z YYYY", s, tzload("local"), nil) == nil)
		return -1;
	return tmnorm(&tm);
}

void
sleep_ms(int ms)
{
	if(ms != 0)
		sleep(ms);
}

int
ftruncate(int f, off_t sz)
{
	Dir d;

	nulldir(&d);
	d.length = sz;
	return dirfwstat(f, &d) > 0 ? 0 : -1;
}

extern uchar bootcode[];
extern ulong bootlen;

void
main(int argc, char **argv)
{
	argv0 = argv[0];
	setfcr(FPPDBL|FPRNR|FPOVFL);
	tmfmtinstall();
	D_PNAN = strtod("+NaN", nil);
	D_PINF = strtod("+Inf", nil);
	flmain(bootcode, bootlen, argc, argv);
}