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CLOCK
!!!CLOCK
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
NOTES
SEE ALSO
----
!!NAME


clock - Determine processor time
!!SYNOPSIS


__#include
__
!!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__. If the processor time used is not
available or its value cannot be represented, the function
returns the value (clock_t)-1.
!!CONFORMING TO


ANSI C. POSIX requires that CLOCKS_PER_SEC equals 1000000
independent of the actual resolution.
!!NOTES


The C standard allows for arbitrary values at the start of
the program; subtract the value returned from a call to
__clock()__ at the start of the program 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


getrusage(2), times(2)
----

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Last edited on Tuesday, June 4, 2002 12:24:14 am by "perry"

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