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.TH "MPI_REQUEST_GET_STATUS_SOME" "3" "Oct 13, 2026" "" "Open MPI"
.SH NAME
MPI_Request_get_status_some \- Access information associated with an
.sp
MPI_Request_get_status_some — Access information associated with an
array of requests without freeing the requests.
.SH SYNTAX
.SS C Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.EX
int MPI_Request_get_status_some(int incount, const MPI_Request
    array_of_requests[], int* outcount, int array_of_indices[],
    MPI_Status array_of_statuses[])
.EE
.UNINDENT
.UNINDENT
.SS Fortran Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.EX
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq
MPI_REQUEST_GET_STATUS_SOME(INCOUNT, ARRAY_OF_REQUESTS, OUTCOUNT, ARRAY_OF_INDICES, ARRAY_OF_STATUSES, IERROR)
    INTEGER INCOUNT, ARRAY_OF_REQUESTS(*), OUTCOUNT, ARRAY_OF_INDICES(*), ARRAY_OF_STATUSES(MPI_STATUS_SIZE, *), IERROR
.EE
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.UNINDENT
.SS Fortran 2008 Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.EX
USE mpi_f08
MPI_Request_get_status_some(incount, array_of_requests, outcount, array_of_indices, array_of_statuses, ierror)
    INTEGER, INTENT(IN) :: incount
    TYPE(MPI_Request), INTENT(IN) :: array_of_requests(incount)
    INTEGER, INTENT(OUT) :: outcount, array_of_indices(*)
    TYPE(MPI_Status) :: array_of_statuses(*)
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror
.EE
.UNINDENT
.UNINDENT
.SH INPUT PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBincount\fP: List length (non\-negative integer).
.IP \(bu 2
\fBarray_of_requests\fP: Array of requests (array of handles).
.UNINDENT
.SH OUTPUT PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBoutcount\fP: Number of completed requests (integer).
.IP \(bu 2
\fBarray_of_indices\fP: Array of indices of operations that completed (array of integers).
.IP \(bu 2
\fBarray_of_statuses\fP: Array of \fBMPI_Status\fP objects for operations that completed (array of status).
.IP \(bu 2
\fBierror\fP: Fortran only: Error status (integer).
.UNINDENT
.SH DESCRIPTION
.sp
MPI_Request_get_status_some returns in outcount the number of
requests from the list \fBarray_of_requests\fP that have completed. The
first \fBoutcount\fP locations of the array \fBarray_of_indices\fP and
\fBarray_of_statuses\fP will contain the indices of the operations
within the array \fBarray_of_requests\fP and the status of these
operations respectively. The array is indexed from zero in C and from
one in Fortran. It does not deallocate or deactivate the request; a
subsequent call to any of the MPI test, wait, or free routines should be
executed with each completed request.
.sp
If no operation in \fBarray_of_requests\fP is complete, it returns
\fBoutcount = 0\fP\&. If all operations in \fBarray_of_requests\fP are either
\fBMPI_REQUEST_NULL\fP or inactive, \fBoutcount\fP will be set to \fBMPI_UNDEFINED\fP\&.
.sp
If your application does not need to examine the \fIstatus\fP field, you can
save resources by using the predefined constant \fBMPI_STATUSES_IGNORE\fP as a
special value for the \fBarray_of_statuses\fP argument.
.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
MPI_Init \%<#\:mpi-init>/MPI_Init_thread \%<#\:mpi-init-thread>, after MPI_Finalize \%<#\:mpi-finalize>, or when using the Sessions
Model exclusively) the error raises the initial error handler. The initial
error handler can be changed by calling MPI_Comm_set_errhandler \%<#\:mpi-comm-set-errhandler> on
MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
argument to mpiexec or info key to MPI_Comm_spawn \%<#\:mpi-comm-spawn>/MPI_Comm_spawn_multiple \%<#\:mpi-comm-spawn-multiple>\&.
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 MPI_Abort \%<#\:mpi-abort> was called on that communicator. If
called on a window or file, acts as if MPI_Abort \%<#\:mpi-abort> 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
MPI_Comm_create_errhandler \%<#\:mpi-comm-create-errhandler> then MPI_Comm_set_errhandler \%<#\:mpi-comm-set-errhandler>
.IP \(bu 2
MPI_File_create_errhandler \%<#\:mpi-file-create-errhandler> then MPI_File_set_errhandler \%<#\:mpi-file-set-errhandler>
.IP \(bu 2
MPI_Session_create_errhandler \%<#\:mpi-session-create-errhandler> then MPI_Session_set_errhandler \%<#\:mpi-session-set-errhandler> or at MPI_Session_init \%<#\:mpi-session-init>
.IP \(bu 2
MPI_Win_create_errhandler \%<#\:mpi-win-create-errhandler> then MPI_Win_set_errhandler \%<#\:mpi-win-set-errhandler>
.UNINDENT
.sp
Note that MPI does not guarantee that an MPI program can continue past
an error.
.sp
See the MPI man page \%<#\:open-mpi> for a full list of MPI error codes \%<#\:open-mpi-errors>\&.
.sp
See the Error Handling section of the MPI\-5.0 standard for
more information.
.SH Author
The Open MPI community
.SH Copyright
2003-2026, The Open MPI Community
.\" End of generated man page.