focal (3) MPI_Win_attach.openmpi.3.gz

NAME

       MPI_Win_attach,  MPI_Win_detach  -  One-sided  MPI  call  that  attach  /  detach a window object for RMA
       operations.

SYNTAX

C Syntax

       #include <mpi.h>
       MPI_Win_attach(MPI_Win win, void *base, MPI_Aint size)

       MPI_Win_detach(MPI_Win win, void *base)

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_WIN_ATTACH(WIN, BASE, SIZE, IERROR)
            <type> BASE(*)
            INTEGER(KIND=MPI_ADDRESS_KIND) SIZE
            INTEGER WIN, IERROR

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Win_attach(win, base, size, ierror)
            TYPE(MPI_Win), INTENT(IN) :: win
            TYPE(*), DIMENSION(..), INTENT(IN) :: base
            INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: size
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

       win       A window that was created with MPI_Win_create_dynamic

       base      Initial address of window (choice).

       size      Size of window in bytes (nonnegative integer).

OUTPUT PARAMETERS

       win       Window object returned by the call (handle).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Win_attach is a one-sided MPI communication collective call executed by all processes in the group of
       comm.  It  returns  a  window  object that can be used by these processes to perform RMA operations. Each
       process specifies a window of existing memory that it exposes to RMA accesses by  the  processes  in  the
       group of comm. The window consists of size bytes, starting at address base. A process may elect to expose
       no memory by specifying size = 0.

       If the base value used by MPI_Win_attach was allocated by MPI_Alloc_mem, the size of the window can be no
       larger than the value set by the MPI_ALLOC_MEM function.

NOTES

       Use  memory  allocated  by  MPI_Alloc_mem  to guarantee properly aligned window boundaries (such as word,
       double-word, cache line, page frame, and so on).

ERRORS

       Almost all MPI routines return an error value; C routines as  the  value  of  the  function  and  Fortran
       routines in the last argument.

       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.