ATOMIC_CAS— Atomic compare and swap
ATOMIC_CAScompares the variable ATOM with the value of COMPARE; if the value is the same, ATOM is set to the value of NEW. Additionally, OLD is set to the value of ATOM that was used for the comparison. When STAT is present and the invokation was successful, it is assigned the value 0. If it is present and the invokation 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
STAT_STOPPED_IMAGEand if the remote image has failed, the value
CALL ATOMIC_CAS (ATOM, OLD, COMPARE, NEW [, STAT])
|ATOM||Scalar coarray or coindexed variable of either integer
type with |
|OLD||Scalar of the same type and kind as ATOM.
|COMPARE||Scalar variable of the same type and kind as
|NEW||Scalar variable of the same type as ATOM. If kind
is different, the value is converted to the kind of ATOM.
|STAT||(optional) Scalar default-kind integer variable.
program atomic use iso_fortran_env logical(atomic_logical_kind) :: atom[*], prev call atomic_cas (atom, prev, .false., .true.)) end program atomic