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9.31 ATOMIC_DEFINE — Setting a variable atomically ¶

Description:

ATOMIC_DEFINE(ATOM, VALUE) defines the variable ATOM with the value VALUE atomically. 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_DEFINE (ATOM, VALUE [, 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.
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:

program atomic
  use iso_fortran_env
  integer(atomic_int_kind) :: atom[*]
  call atomic_define (atom[1], this_image())
end program atomic

See also:

ATOMIC_REF — Obtaining the value of a variable atomically, ATOMIC_CAS — Atomic compare and swap, ISO_FORTRAN_ENV, ATOMIC_ADD — Atomic ADD operation, ATOMIC_AND — Atomic bitwise AND operation, ATOMIC_OR — Atomic bitwise OR operation, ATOMIC_XOR — Atomic bitwise OR operation