NAME

       MPI_Win_get_attr - Obtains the value of a window attribute.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Win_get_attr(MPI_Win win, int win_keyval,
            void *attribute_val, int *flag)

Fortran Syntax (see FORTRAN 77 NOTES)

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_WIN_GET_ATTR(WIN, WIN_KEYVAL, ATTRIBUTE_VAL, FLAG, IERROR)
            INTEGER WIN, WIN_KEYVAL, IERROR
            INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL
            LOGICAL FLAG

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Win_get_attr(win, win_keyval, attribute_val, flag, ierror)
            TYPE(MPI_Win), INTENT(IN) :: win
            INTEGER, INTENT(IN) :: win_keyval
            INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: attribute_val
            LOGICAL, INTENT(OUT) :: flag
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

C++ Syntax

       #include <mpi.h>
       bool MPI::Win::Get_attr(int win_keyval, void* attribute_val) const

INPUT PARAMETERS

       win       Window to which the attribute is attached (handle).

       win_keyval
                 Key value (integer).

OUTPUT PARAMETERS

       attribute_val
                 Attribute value, unless ag = false

       flag      False if no attribute is associated with the key (logical).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       Obtains the value of a window attribute.

FORTRAN 77 NOTES

       The  MPI  standard  prescribes portable Fortran syntax for the ATTRIBUTE_VAL argument only
       for Fortran 90. FORTRAN 77 users may use the non-portable syntax

            INTEGER*MPI_ADDRESS_KIND ATTRIBUTE_VAL

       where MPI_ADDRESS_KIND is a constant defined  in  mpif.h  and  gives  the  length  of  the
       declared integer in bytes.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and
       Fortran routines in the last argument. C++ functions do not return errors. If the  default
       error  handler  is  set  to  MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception
       mechanism will be used to throw an MPI::Exception object.

       Before the error value is returned, the current MPI error handler is called.  By  default,
       this  error  handler aborts the MPI job, except for I/O function errors. The error handler
       may   be   changed   with   MPI_Comm_set_errhandler;   the   predefined   error    handler
       MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not
       guarantee that an MPI program can continue past an error.