system_clock(3I)

NAME
     SYSTEM_CLOCK - Returns integer data from a real-time clock

SYNOPSIS
     CALL SYSTEM_CLOCK ([[COUNT=]count] [,[COUNT_RATE=]count_rate]
     [,[COUNT_MAX=count_max])

IMPLEMENTATION
     UNICOS, UNICOS/mk, IRIX systems

     CF90, MIPSpro 7 Fortran 90

STANDARDS
     Fortran

DESCRIPTION
     The SYSTEM_CLOCK intrinsic subroutine returns information gathered
     from the real-time clock.  SYSTEM_CLOCK accepts the following
     arguments:

     count     Must be type default integer.  If count is present, it is
               set to a machine-specific value based on the current value
               of the machine's clock.  If there is no clock, it is set to
               -HUGE(0).  The machine-specific value is incremented by one
               for each clock count until the value count_max is reached;
               it is reset to 0 at the next count.  If there is a clock, it
               lies in the range 0 to count_max.

     count_rate
               Must be type default integer.  If count_rate is present, it
               is set to the number of clock counts per second.  If there
               is no clock, it is set to 0.

     count_max Must be type default integer.  If count_max is present, it
               is set to the maximum value that count can have.  If there
               is no clock, it is set to 0.

     The arguments to SYSTEM_CLOCK cannot be declared with a nondefault
     kind type.

     The name of this intrinsic cannot be passed as an argument.

     Hardware counter values from the syssgi(2) system call are used on
     IRIX systems.  The real-time clock is used on UNICOS and UNICOS/mk
     systems.

     Due to the hardware characteristics of UNICOS systems, the values
     returned in count and count_max are 64-bit values on these systems.

SEE ALSO
     SYSCLOCK(3F)

     gettimeofday(2) in the UNICOS System Calls Reference Manual

     Intrinsic Procedures Reference Manual for the printed version of this
     man page.