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.TH "MPI_WIN_ATTACH" "3" "Apr 11, 2024" "" "Open MPI"
.sp
\fI\%MPI_Win_attach\fP, \fI\%MPI_Win_detach\fP \- One\-sided MPI call that attaches /
detaches a memory region to / from a window object for RMA operations.
.SH SYNTAX
.SS C Syntax
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.EX
#include <mpi.h>

MPI_Win_attach(MPI_Win win, void *base, MPI_Aint size)

MPI_Win_detach(MPI_Win win, void *base)
.EE
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.SS Fortran Syntax
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.EX
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq
MPI_WIN_ATTACH(WIN, BASE, SIZE, IERROR)
     <type> BASE(*)
     INTEGER(KIND=MPI_ADDRESS_KIND) SIZE
     INTEGER WIN, IERROR

MPI_WIN_DETACH(WIN, BASE, IERROR)
     <type> BASE(*)
     INTEGER WIN, IERROR
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.SS Fortran 2008 Syntax
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.EX
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

MPI_Win_detach(win, base, ierror)
     TYPE(MPI_Win), INTENT(IN) :: win
     TYPE(*), DIMENSION(..), INTENT(IN) :: base
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBwin\fP: A window that was created with \fIMPI_Win_create_dynamic\fP
.IP \(bu 2
\fBbase\fP: Initial address of window (choice).
.IP \(bu 2
\fBsize\fP: Size of window in bytes (nonnegative integer).
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.SH OUTPUT PARAMETERS
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.IP \(bu 2
\fBwin\fP: Window object returned by the call (handle).
.IP \(bu 2
\fBierror\fP: Fortran only: Error status (integer).
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.SH DESCRIPTION
.sp
\fI\%MPI_Win_attach\fP is a one\-sided MPI communication call used to attach a
memory region of \fIsize\fP bytes starting at address \fIbase\fP to a window for
RMA access. The window \fIwin\fP must have been created using
\fI\%MPI_Win_create_dynamic\fP\&. Multiple non\-overlapping memory regions may be
attached to the same dynamic window. Attaching overlapping memory
regions to the same dynamic window is erroneous.
.sp
If the \fIbase\fP value used by \fI\%MPI_Win_attach\fP was allocated by
\fI\%MPI_Alloc_mem\fP, the size of the window can be no larger than the value
set by the \fI\%MPI_Alloc_mem\fP function.
.sp
\fI\%MPI_Win_detach\fP can be used to detach a previously attached memory region
from \fIwin\fP\&. The memory address \fIbase\fP and \fIwin\fP must match arguments
passed to a previous call to \fI\%MPI_Win_attach\fP\&.
.SH NOTES
.sp
Use memory allocated by \fI\%MPI_Alloc_mem\fP to guarantee properly aligned
window boundaries (such as word, double\-word, cache line, page frame,
and so on).
.SH ERRORS
.sp
Almost all MPI routines return an error value; C routines as the return result
of the function and Fortran routines in the last argument.
.sp
Before the error value is returned, the current MPI error handler associated
with the communication object (e.g., communicator, window, file) is called.
If no communication object is associated with the MPI call, then the call is
considered attached to MPI_COMM_SELF and will call the associated MPI error
handler. When MPI_COMM_SELF is not initialized (i.e., before
\fI\%MPI_Init\fP/\fI\%MPI_Init_thread\fP, after \fI\%MPI_Finalize\fP, or when using the Sessions
Model exclusively) the error raises the initial error handler. The initial
error handler can be changed by calling \fI\%MPI_Comm_set_errhandler\fP on
MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
argument to mpiexec or info key to \fI\%MPI_Comm_spawn\fP/\fI\%MPI_Comm_spawn_multiple\fP\&.
If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
handler is called for all other MPI functions.
.sp
Open MPI includes three predefined error handlers that can be used:
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.IP \(bu 2
\fBMPI_ERRORS_ARE_FATAL\fP
Causes the program to abort all connected MPI processes.
.IP \(bu 2
\fBMPI_ERRORS_ABORT\fP
An error handler that can be invoked on a communicator,
window, file, or session. When called on a communicator, it
acts as if \fI\%MPI_Abort\fP was called on that communicator. If
called on a window or file, acts as if \fI\%MPI_Abort\fP was called
on a communicator containing the group of processes in the
corresponding window or file. If called on a session,
aborts only the local process.
.IP \(bu 2
\fBMPI_ERRORS_RETURN\fP
Returns an error code to the application.
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MPI applications can also implement their own error handlers by calling:
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.IP \(bu 2
\fI\%MPI_Comm_create_errhandler\fP then \fI\%MPI_Comm_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_File_create_errhandler\fP then \fI\%MPI_File_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_Session_create_errhandler\fP then \fI\%MPI_Session_set_errhandler\fP or at \fI\%MPI_Session_init\fP
.IP \(bu 2
\fI\%MPI_Win_create_errhandler\fP then \fI\%MPI_Win_set_errhandler\fP
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.sp
Note that MPI does not guarantee that an MPI program can continue past
an error.
.sp
See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
.sp
See the Error Handling section of the MPI\-3.1 standard for
more information.
.SH COPYRIGHT
2003-2024, The Open MPI Community
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