ref: 7bcf6ac7b612306d197d063aaf6d971ca5dd2e3f
dir: /time_plan9.c/
#include "flisp.h" #include "timefuncs.h" #include <tos.h> double sec_realtime(void) { vlong t = nsec(); vlong ns = t % 1000000000LL; vlong s = (t - ns) / 1000000000LL; 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 */ uint64_t nanosec_monotonic(void) { static uint64_t fasthz, xstart; uint64_t x, div; 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; /* this is ugly */ for(div = 1000000000ULL; x < 0x1999999999999999ULL && div > 1 ; div /= 10ULL, x *= 10ULL); return x / (fasthz / div); } 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); }