Manual Reference Pages - atomic_ref (3)
atomic_ref(3f) - [FORTRAN:INTRINSIC] Obtaining the value of a variable atomically
CONTENTS
Syntax
Description
Arguments
Example
Standard
Class
See Also
SYNTAX
call atomic_ref(value, atom [, stat])
DESCRIPTION
atomic_ref(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.
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 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 demo_atomic_ref
STANDARD
[[Fortran 2008]] and later; with STAT, [[TS 18508]] or later
CLASS
Atomic subroutine
SEE ALSO
[[atomic_define]], [[atomic_cas]], [[iso_fortran_env]], [[atomic_fetch_add]], [[atomic_fetch_and]], [[atomic_fetch_or]], [[atomic_fetch_xor]]
| atomic_ref (3) | March 18, 2019 |
