CLOCK (3)
Determine processor time
SYNOPSIS
#include <time.h>
clock_t clock(void);
DESCRIPTION
The
clock()
function returns an approximation of processor time used by the program.
RETURN VALUE
The value returned is the CPU time used so far as a
clock_t ;
to get the number of seconds used, divide by
CLOCKS_PER_SEC .
CONFORMING TO
ANSI C.
POSIX requires that CLOCKS_PER_SEC equals 1000000 independent
of the actual resolution.
BUGS
The C standard allows for arbitrary values at the start of the program; take
the difference between the value returned from a call to
clock()
at the start of the program and the end to get maximum portability.
Note that the time can wrap around. On a 32bit system where
CLOCKS_PER_SEC equals 1000000 this function will return the same
value approximately every 72 minutes.
The
times()
function call returns more information.
SEE ALSO
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