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Manual Reference Pages  - atomic_add (3)

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NAME

atomic_add(3f) - [FORTRAN:INTRINSIC:ATOMIC] Atomic ADD operation

SYNTAX

call atomic_add (atom, value [, stat])

DESCRIPTION

atomic_add(atom, value) atomically adds the value of VAR to the variable ATOM. 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

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

EXAMPLE

Sample program:

   program demo_atomic_add
   use iso_fortran_env
   implicit none
   integer(atomic_int_kind) :: atom[*]
      call atomic_add (atom[1], this_image())
   end program demo_atomic_add

STANDARD

[[TS 18508]] or later

CLASS

Atomic subroutine

SEE ALSO

atomic_define(3), atomic_fetch_add(3), iso_fortran_env(3), atomic_and(3), atomic_or(3), atomic_xor(3)

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atomic_add (3)

March 11, 2021

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