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.TH "MPI_STATUS_SET_ELEMENTS" "3" "Apr 08, 2024" "" "Open MPI"
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\fI\%MPI_Status_set_elements\fP, \fI\%MPI_Status_set_elements_x\fP \- Modifies
opaque part of \fIstatus\fP to allow \fI\%MPI_Get_elements\fP to return \fIcount\fP\&.
.SH SYNTAX
.SS C Syntax
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.INDENT 3.5
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.nf
.ft C
#include <mpi.h>

int MPI_Status_set_elements(MPI_Status *status, MPI_Datatype datatype, int count)
int MPI_Status_set_elements_x(MPI_Status *status, MPI_Datatype datatype, MPI_Count count)
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.SS Fortran Syntax
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.INDENT 3.5
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.nf
.ft C
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq
MPI_STATUS_SET_ELEMENTS(STATUS, DATATYPE, COUNT, IERROR)
     INTEGER STATUS(MPI_STATUS_SIZE), DATATYPE, COUNT, IERROR
MPI_STATUS_SET_ELEMENTS_X(STATUS, DATATYPE, COUNT, IERROR)
     INTEGER STATUS(MPI_STATUS_SIZE), DATATYPE
        INTEGER(KIND=MPI_COUNT_KIND) COUNT
        INTEGER IERROR
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.SS Fortran 2008 Syntax
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.ft C
USE mpi_f08
MPI_Status_set_elements(status, datatype, count, ierror)
     TYPE(MPI_Status), INTENT(INOUT) :: status
     TYPE(MPI_Datatype), INTENT(IN) :: datatype
     INTEGER, INTENT(IN) :: count
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror
MPI_Status_set_elements_x(status, datatype, count, ierror)
     TYPE(MPI_Status), INTENT(INOUT) :: status
     TYPE(MPI_Datatype), INTENT(IN) :: datatype
     INTEGER(KIND = MPI_COUNT_KIND), INTENT(IN) :: count
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.fi
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.SH INPUT/OUTPUT PARAMETER
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.IP \(bu 2
\fBstatus\fP: Status to associate with \fIcount (status).\fP
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBdatatype\fP: Data type associated with \fIcount (handle).\fP
.IP \(bu 2
\fBcount\fP: Number of elements to associate with \fIstatus (integer).\fP
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.SH OUTPUT PARAMETER
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.IP \(bu 2
\fBierror\fP: Fortran only: Error status (integer).
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.SH DESCRIPTION
.sp
\fI\%MPI_Status_set_elements\fP modifies the opaque part of \fIstatus so that a
call to :ref:\(gaMPI_Get_elements\(ga or :ref:\(gaMPI_Get_elements_x\(ga will return count.
:ref:\(gaMPI_Get_count\(ga will return a compatible value.\fP
.sp
A subsequent call to MPI_Get_count(status, datatype, count), to
MPI_Get_elements(status, datatype, count), or to
MPI_Get_elements_x(status, datatype, count) must use a data\-type
argument that has the same type signature as the data\-type argument that
was used in the call to \fI\%MPI_Status_set_elements\fP\&.*
.SH NOTES
.sp
Users are advised not to reuse the status fields for values other than
those for which they were intended. Doing so may lead to unexpected
results when using the status object. For example, calling
\fI\%MPI_Get_elements\fP may cause an error if the value is out of range, or it
may be impossible to detect such an error. The \fIextra_state argument
provided with a generalized request can be used to return information
that does not logically belong in status. Furthermore, modifying the
values in a status set internally by MPI, such as :ref:\(gaMPI_Recv\(ga, may lead to
unpredictable results and is strongly discouraged.\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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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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