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Manual Reference Pages  - atomic_ref (3)

NAME

atomic_ref(3f) - [FORTRAN:INTRINSIC:ATOMIC] Obtaining the value of a variable atomically

SYNTAX

call atomic_ref(value, atom [, stat])

DESCRIPTION

atomic_ref(VALUE, ATOM ) 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.

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

Sample program:

   program demo_atomic_ref
   use iso_fortran_env
   implicit none
   logical(atomic_logical_kind) :: atom[*]
   logical :: val
      call atomic_ref( val, atom[1] )
      ! ...
      call atomic_ref( val, atom[1] )
      if (val) then
         print *, "Obtained"
      endif
   end program demo_atomic_ref

STANDARD

[[Fortran 2008]] and later; with STAT, [[TS 18508]] or later

CLASS

Atomic subroutine

SEE ALSO

atomic_define(3), atomic_cas(3), iso_fortran_env(3), atomic_fetch_add(3), atomic_fetch_and(3), atomic_fetch_or(3), atomic_fetch_xor(3)


atomic_ref (3) March 11, 2021
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