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) or system(3S).

The resolution of the clock varies, depending on the hardware and on the software configuration. 

WARNINGS

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). 

HARDWARE DEPENDENCIES

Series 200, 300
The clock resolution is 20 milliseconds.

Series 500, 800
The default clock resolution is 10 milliseconds.

SEE ALSO

times(2), wait(2), system(3S). 

Hewlett-Packard Company  —  Version B.1,  April 12, 1993