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.TH "MPI_TYPE_CREATE_RESIZED" "3" "Apr 11, 2024" "" "Open MPI"
.sp
\fI\%MPI_Type_create_resized\fP — Returns a new data type with new extent
and upper and lower bounds.
.SH SYNTAX
.SS C Syntax
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.INDENT 3.5
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.EX
#include <mpi.h>

int MPI_Type_create_resized(MPI_Datatype oldtype, MPI_Aint lb,
     MPI_Aint extent, MPI_Datatype *newtype)
.EE
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.SS Fortran Syntax
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.EX
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq
MPI_TYPE_CREATE_RESIZED(OLDTYPE, LB, EXTENT, NEWTYPE, IERROR)
     INTEGER OLDTYPE, NEWTYPE, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND)  LB, EXTENT
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.SS Fortran 2008 Syntax
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.EX
USE mpi_f08
MPI_Type_create_resized(oldtype, lb, extent, newtype, ierror)
     INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: lb, extent
     TYPE(MPI_Datatype), INTENT(IN) :: oldtype
     TYPE(MPI_Datatype), INTENT(OUT) :: newtype
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBoldtype\fP: Input data type (handle).
.IP \(bu 2
\fBlb\fP: New lower bound of data type (integer).
.IP \(bu 2
\fBextent\fP: New extent of data type (integer).
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.SH OUTPUT PARAMETERS
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.IP \(bu 2
\fBnewtype\fP: Output data type (handle).
.IP \(bu 2
\fBierror\fP: Fortran only: Error status (integer).
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.SH DESCRIPTION
.sp
\fI\%MPI_Type_create_resized\fP returns in \fInewtype\fP a handle to a new data type
that is identical to \fIoldtype\fP, except that the lower bound of this new
data type is set to be \fIlb\fP, and its upper bound is set to be \fIlb\fP +
\fIextent\fP\&. Any previous \fIlb\fP and \fIub\fP markers are erased, and a new pair
of lower bound and upper bound markers are put in the positions
indicated by the \fIlb\fP and \fIextent\fP arguments. This affects the behavior
of the data type when used in communication operations, with \fIcount\fP >
1, and when used in the construction of new derived data types.
.SH NOTE
.sp
Use of \fI\%MPI_Type_create_resized\fP is strongly recommended over the legacy
MPI\-1 functions \fI\%MPI_Type_extent\fP and \fI\%MPI_Type_lb\fP\&.
.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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\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.
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\fBSEE ALSO:\fP
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.INDENT 3.5
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.IP \(bu 2
\fI\%MPI_Type_get_extent\fP
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.SH COPYRIGHT
2003-2024, The Open MPI Community
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