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9.37 ATOMIC_REF — Obtaining the value of a variable atomically

Description:
ATOMIC_DEFINE(ATOM, VALUE) atomically assigns the value of the variable ATOM to VALUE. When STAT is present and the invocation was successful, it is assigned the value 0. If it is present and the invocation 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:
Fortran 2008 and later; with STAT, TS 18508 or later
Class:
Atomic subroutine
Syntax:
CALL ATOMIC_REF(VALUE, ATOM [, STAT])
Arguments:

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

Example:
          program atomic
            use iso_fortran_env
            logical(atomic_logical_kind) :: atom[*]
            logical :: val
            call atomic_ref (atom, .false.)
            ! ...
            call atomic_ref (atom, val)
            if (val) then
              print *, "Obtained"
            end if
          end program atomic

See also:
ATOMIC_DEFINE, ATOMIC_CAS, ISO_FORTRAN_ENV, ATOMIC_FETCH_ADD, ATOMIC_FETCH_AND, ATOMIC_FETCH_OR, ATOMIC_FETCH_XOR