SECONDS(10.2) SECONDS(10.2)
NAME
seconds, ticks, HZ, MS2HZ, MS2TK, TK2MS, TK2SEC - kernel times and time
conversions
SYNOPSIS
long seconds(void)
ulong ticks(void)
#define HZ ...
#define MS2HZ(t) ...
#define TK2SEC(t) ...
#define TK2MS(t) ...
#define MS2TK(m) ...
DESCRIPTION
Seconds returns the system's idea of the current time as the number of
seconds since the start of the epoch (00:00:00 GMT, January 1, 1970).
Ticks returns the number of system-dependent clock ticks since system
boot.
The system clock frequency is platform-dependent. Several symbolic
constants and macro functions are defined by the file mem.h to convert
between different time units:
HZ The number of clock ticks per second.
MS2HZ Milliseconds per clock tick.
TK2SEC(t)
Convert t clock ticks to seconds and return the result (truncat‐
ing not rounding).
TK2MS(t)
Convert t clock ticks to milliseconds and return the result.
MS2TK(m)
Convert m milliseconds to clock ticks and return the result
(truncating).
The functions are often used to calculate delays for timing functions,
for instance:
if(atactlrwait(dp->cp, DHmagic, 0, MS2TK(100))){
...
}
SECONDS(10.2)
