g77.info: DTime Intrinsic (subroutine)

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DTime Intrinsic (subroutine)

     CALL DTime(TARRAY, RESULT)

TARRAY: `REAL(KIND=1)'; DIMENSION(2); INTENT(OUT).

RESULT: `REAL(KIND=1)'; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Initially, return the number of seconds of runtime since the start
of the process's execution in RESULT, and the user and system
components of this in `TARRAY(1)' and `TARRAY(2)' respectively.  The
value of RESULT is equal to `TARRAY(1) + TARRAY(2)'.

   Subsequent invocations of `DTIME()' set values based on accumulations
since the previous invocation.

   On some systems, the underlying timings are represented using types
with sufficiently small limits that overflows (wraparounds) are
possible, such as 32-bit types.  Therefore, the values returned by this
intrinsic might be, or become, negative, or numerically less than
previous values, during a single run of the compiled program.

   Some non-GNU implementations of Fortran provide this intrinsic as
only a function, not as a subroutine.

   For information on other intrinsics with the same name: *Note DTime
Intrinsic (function)::.