timecounter(9) - NetBSD Manual Pages

TIME(9)                NetBSD Kernel Developer's Manual                TIME(9)


NAME
boottime, time_second, time_uptime -- system time variables
SYNOPSIS
#include <sys/time.h> extern struct timeval boottime; extern time_t time_second; extern time_t time_uptime;
DESCRIPTION
The boottime variable holds the system boot time. The time_second variable is the system's ``wall time'' clock to the sec- ond. The time_uptime variable is the number of seconds since boot. The bintime(9), getbintime(9), microtime(9), getmicrotime(9), nanotime(9), and getnanotime(9) functions can be used to get the current time more accurately and in an atomic manner. Similarly, the binuptime(9), getbinuptime(9), microuptime(9), getmicrouptime(9), nanouptime(9), and getnanouptime(9) functions can be used to get the time elapse since boot more accurately and in an atomic manner. The boottime variable may be read and written without special precautions.
SEE ALSO
clock_settime(2), ntp_adjtime(2), settimeofday(2), bintime(9), binuptime(9), getbintime(9), getbinuptime(9), getmicrotime(9), getmicrouptime(9), getnanotime(9), getnanouptime(9), microtime(9), microuptime(9), nanotime(9), nanouptime(9) Poul-Henning Kamp, "Timecounters: Efficient and precise timekeeping in SMP kernels", Proceedings of EuroBSDCon 2002, Amsterdam. Marshall Kirk McKusick and George V. Neville-Neil, The Design and Implementation of the FreeBSD Operating System, Addison-Wesley, 57-61,65-66, July 2004. NetBSD 4.0 September 17, 2004 NetBSD 4.0

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