MPI_Win_attach(3) Open MPI MPI_Win_attach(3)
NAME
MPI_Win_attach, MPI_Win_detach - One-sided MPI call that attaches / de-
taches a memory region to / from 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 call used to attach a
memory region of size bytes starting at address base to a window for
RMA access. The window win must have been created using MPI_Win_cre-
ate_dynamic. Multiple non-overlapping memory regions may be attached
to the same dynamic window. Attaching overlapping memory regions to the
same dynamic window is erroneous.
If the base value used by MPI_Win_attach was allocated by MPI_Al-
loc_mem, the size of the window can be no larger than the value set by
the MPI_ALLOC_MEM function.
MPI_Win_detach can be used to detach a previously attached memory re-
gion from win. The memory address base and win must match arguments
passed to a previous call to MPI_Win_attach.
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.
4.1.2 Nov 24, 2021 MPI_Win_attach(3)
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