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.TH "MPI_SESSION_GET_NTH_PSET" "3" "Jul 22, 2024" "" "Open MPI"
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\fI\%MPI_Session_get_nth_pset\fP — Query runtime for name of the nth process set
.SH SYNTAX
.SS C Syntax
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.INDENT 3.5
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.nf
.ft C
#include <mpi.h>

int MPI_Session_get_nth_pset(MPI_Session session, MPI_Info info, int n, int *pset_len, char *pset_name)
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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_SESSION_GET_NTH_PSET(SESSION, INFO, N, PSET_LEN, PSET_NAME, IERROR)
    INTEGER SESSION, INFO, N, PSET_LEN, IERROR
    CHARACTER*(*) PSET_NAME
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.SS Fortran 2008 Syntax
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.INDENT 3.5
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.ft C
USE mpi_f08

MPI_Session_get_nth_pset(session, info, n, pset_len, pset_name, ierror)
    TYPE(MPI_Session), INTENT(IN) :: session
    TYPE(MPI_Info), INTENT(IN) :: info
    INTEGER, INTENT(IN) :: n
    INTEGER, INTENT(INOUT) :: pset_len
    CHARACTER(LEN=*), INTENT(OUT) :: pset_name
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBsession\fP : session (handle)
.IP \(bu 2
\fBinfo\fP : info object (handle)
.IP \(bu 2
\fBn\fP : index of the desired process set name (integer)
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.SS INPUT/OUTPUT PARAMETER
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.IP \(bu 2
\fBpset_len\fP : length of the pset_name argument (integer)
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.SH OUTPUT PARAMETERS
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.IP \(bu 2
\fBpset_name\fP : name of the nth process set (string)
.IP \(bu 2
\fBierror\fP : Fortran only: Error status (integer).
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.SH DESCRIPTION
.sp
\fI\%MPI_Session_get_nth_pset\fP returns the name of the nth process set in the
supplied pset_name buffer. pset_len is the size of the buffer needed to
store the nth process set name. If the pset_len passed into the function
is less than the actual buffer size needed for the process set name,
then the string value returned in pset_name is truncated. If pset_len is
set to 0, pset_name is not changed. On return, the value of pset_len
will be set to the required buffer size to hold the process set name. In
C, pset_len includes the required space for the null terminator. In C,
this function returns a null terminated string in all cases where the
pset_len input value is greater than 0.
.SH NOTES
.sp
Process set names have an implementation\-defined maximum length of
MPI_MAX_PSET_NAME_LEN characters. MPI_MAX_PSET_NAME_LEN shall have a
value of at least 63.
.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.
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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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Note that MPI does not guarantee that an MPI program can continue past
an error.
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See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
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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
\fI\%MPI_Session_init\fP
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.SH COPYRIGHT
2003-2024, The Open MPI Community
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