CLOCK(3C) (C Programming Language Utilities) CLOCK(3C)
NAME
clock - report CPU time used
SYNOPSIS
long clock ( )
DESCRIPTION
clock returns the amount of CPU time (in microseconds) used
since the first call to clock. The time reported is the sum
of the user and system times of the calling process and its
terminated child processes for which it has executed
wait(2), pclose(3S), or system(3S).
The resolution of the clock is 10 milliseconds on AT&T 3B
computers.
SEE ALSO
times(2), wait(2), popen(3S), system(3S).
BUGS
The value returned by clock is defined in microseconds for
compatibility with systems that have CPU clocks with much
higher resolution. Because of this, the value returned will
wrap around after accumulating only 2147 seconds of CPU time
(about 36 minutes).
Page 1 May 1989