ATOMIC_CAS(3f)

DESCRIPTION
ATOMIC_CAS compares the variable ATOM with the value of COMPARE; if the value is the same, ATOM is set to the value of NEW. Additionally, OLD is set to the value of ATOM that was used for the comparison. When STAT is present and the invokation was successful, it is assigned the value 0. If it is present and the invokation has failed, it is assigned a positive value; in particular, for a coindexed ATOM, if the remote image has stopped, it is assigned the value of ISO_FORTRAN_ENV's STAT_STOPPED_IMAGE and if the remote image has failed, the value STAT_FAILED_IMAGE.

STANDARD
TS 18508 or later

CLASS
Atomic subroutine

SYNTAX
CALL ATOMIC_CAS (ATOM, OLD, COMPARE, NEW [, STAT])

ARGUMENTS

ATOM Scalar coarray or coindexed variable of either integer type with ATOMIC_INT_KIND kind or logical type with ATOMIC_LOGICAL_KIND kind. OLD Scalar of the same type and kind as ATOM. COMPARE Scalar variable of the same type and kind as ATOM. NEW Scalar variable of the same type as ATOM. If kind is different, the value is converted to the kind of ATOM. STAT (optional) Scalar default-kind integer variable.

EXAMPLE
          program atomic
            use iso_fortran_env
            logical(atomic_logical_kind) :: atom[*], prev
            call atomic_cas (atom[1], prev, .false., .true.))
          end program atomic

SEE ALSO
ATOMIC_DEFINE, ATOMIC_REF, ISO_FORTRAN_ENV

AUTHOR

This information was taken from the GFortran documentation (https://gcc.gnu.org/onlinedocs/gcc-5.3.0/gfortran/) and converted to a manpage by AstroFloyd (http://astrofloyd.org).