NAME

       MPI_Win_create,  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

       INCLUDE 'mpif.h'
       MPI_WIN_ATTACH(WIN, BASE, SIZE, IERROR)
            <type> BASE(*)
            INTEGER(KIND=MPI_ADDRESS_KIND) SIZE
            INTEGER WIN, 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_create 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.