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.TH "MPI_WIN_CREATE_KEYVAL" "3" "May 30, 2025" "" "Open MPI"
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.sp
\fI\%MPI_Win_create_keyval\fP — Creates a keyval for a window.
.SH SYNTAX
.SS C Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
#include <mpi.h>

int MPI_Win_create_keyval(MPI_Win_copy_attr_function *win_copy_attr_fn,
     MPI_Win_delete_attr_function *win_delete_attr_fn,
     int *win_keyval, void *extra_state)
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Fortran Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq
MPI_WIN_CREATE_KEYVAL(WIN_COPY_ATTR_FN, WIN_DELETE_ATTR_FN,
     WIN_KEYVAL, EXTRA_STATE, IERROR)
     EXTERNAL WIN_COPY_ATTR_FN, WIN_DELETE_ATTR_FN
     INTEGER WIN_KEYVAL, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Fortran 2008 Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
USE mpi_f08
MPI_Win_create_keyval(win_copy_attr_fn, win_delete_attr_fn, win_keyval,
             extra_state, ierror)
     PROCEDURE(MPI_Win_copy_attr_function) :: win_copy_attr_fn
     PROCEDURE(MPI_Win_delete_attr_function) :: win_delete_attr_fn
     INTEGER, INTENT(OUT) :: win_keyval
     INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: extra_state
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror
.ft P
.fi
.UNINDENT
.UNINDENT
.SH INPUT PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBwin_copy_attr_fn\fP: Copy callback function for \fIwin_keyval\fP (function).
.IP \(bu 2
\fBwin_delete_attr_fn\fP: Delete callback function for \fIwin_keyval\fP (function).
.IP \(bu 2
\fBextra_state\fP: Extra state for callback functions.
.UNINDENT
.SH OUTPUT PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBwin_keyval\fP: Key value for future access (integer).
.IP \(bu 2
\fBierror\fP: Fortran only: Error status (integer).
.UNINDENT
.SH DESCRIPTION
.sp
The argument \fIwin_copy_attr_fn\fP may be specified as MPI_WIN_NULL_COPY_FN
or MPI_WIN_DUP_FN from either C or Fortran. MPI_WIN_NULL_COPY_FN is a
function that serves only to return \fIflag\fP = 0 and MPI_SUCCESS.
MPI_WIN_DUP_FN is a simple\-minded copy function that sets \fIflag\fP = 1,
returns the value of \fIattribute_val_in\fP in \fIattribute_val_out\fP, and
returns MPI_SUCCESS.
.sp
The argument \fIwin_delete_attr_fn\fP may be specified as
MPI_WIN_NULL_DELETE_FN from either C or Fortran. MPI_WIN_NULL_DELETE_FN
is a function that serves only to return MPI_SUCCESS.
.sp
The C callback functions are:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
typedef int MPI_Win_copy_attr_function(MPI_Win oldwin, int win_keyval,
             void *extra_state, void *attribute_val_in,
             void *attribute_val_out, int *flag);

typedef int MPI_Win_delete_attr_function(MPI_Win win, int win_keyval,
             void *attribute_val, void *extra_state);
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The Fortran callback functions are:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
SUBROUTINE WIN_COPY_ATTR_FN(OLDWIN, WIN_KEYVAL, EXTRA_STATE,
     ATTRIBUTE_VAL_IN, ATTRIBUTE_VAL_OUT, FLAG, IERROR)
     INTEGER OLDWIN, WIN_KEYVAL, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE, ATTRIBUTE_VAL_IN,
             ATTRIBUTE_VAL_OUT
     LOGICAL FLAG

SUBROUTINE WIN_DELETE_ATTR_FN(WIN, WIN_KEYVAL, ATTRIBUTE_VAL,
     EXTRA_STATE, IERROR)
     INTEGER WIN, WIN_KEYVAL, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL, EXTRA_STATE
.ft P
.fi
.UNINDENT
.UNINDENT
.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:
.INDENT 0.0
.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.
.UNINDENT
.sp
MPI applications can also implement their own error handlers by calling:
.INDENT 0.0
.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
.UNINDENT
.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
2003-2025, The Open MPI Community
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