..
  Copyright 1988-2021 Free Software Foundation, Inc.
  This is part of the GCC manual.
  For copying conditions, see the GPL license file

.. _mclock8:

MCLOCK8 --- Time function (64-bit)
**********************************

.. index:: MCLOCK8

.. index:: time, clock ticks

.. index:: clock ticks

.. function:: MCLOCK8

  Returns the number of clock ticks since the start of the process, based
  on the function ``clock(3)`` in the C standard library.

  :return:
    The return value is a scalar of type ``INTEGER(8)``, equal to the
    number of clock ticks since the start of the process, or ``-1`` if
    the system does not support ``clock(3)``.

  :samp:`{Standard}:`
    GNU extension

  :samp:`{Class}:`
    Function

  :samp:`{Syntax}:`

  .. code-block:: fortran

    RESULT = MCLOCK8()

  :samp:`{See also}:`
    CTIME, 
    GMTIME, 
    LTIME, 
    MCLOCK, 
    TIME8