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.TH "MPI_SESSION_FINALIZE" "3" "Jul 22, 2024" "" "Open MPI"
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\fI\%MPI_Session_finalize\fP — releases all MPI state associated with a session
.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_finalize(MPI_Session *session)
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.SS Fortran Syntax
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.ft C
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq

MPI_SESSION_FINALIZE(SESSION, IERROR)
    INTEGER SESSION, IERROR
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.SS Fortran 2008 Syntax
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.ft C
USE mpi_f08

MPI_Session_finalize(session, ierror)
    TYPE(MPI_Session), INTENT(IN) :: session
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBsession\fP : session to be finalized (handle)
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.SH OUTPUT PARAMETERS
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.IP \(bu 2
\fBierror\fP : Fortran only: Error status (integer).
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.SH DESCRIPTION
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\fI\%MPI_Session_finalize\fP releases all MPI state associated with the supplied
session. Every instantiated session must be finalized using
\fI\%MPI_Session_finalize\fP\&. The handle session is set to MPI_SESSION_NULL by
the call.
.SH NOTES
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Before an MPI process invokes \fI\%MPI_Session_finalize\fP, the process must
perform all MPI calls needed to complete its involvement in MPI
communications: it must locally complete all MPI operations that it
initiated and it must execute matching calls needed to complete MPI
communications initiated by other processes. The call to
\fI\%MPI_Session_finalize\fP does not free objects created by MPI calls; these
objects are freed using MPI_XXX_FREE calls. \fI\%MPI_Session_finalize\fP may be
synchronizing on any or all of the groups associated with communicators,
windows, or files derived from the session and not disconnected, freed,
or closed, respectively, before the call to \fI\%MPI_Session_finalize\fP
procedure. \fI\%MPI_Session_finalize\fP behaves as if all such synchronizations
occur concurrently. As \fI\%MPI_Comm_free\fP may mark a communicator for freeing
later, \fI\%MPI_Session_finalize\fP may be synchronizing on the group associated
with a communicator that is only freed (with MPI_Comm_free) rather than
disconnected (with MPI_Comm_disconnect).
.SH ERRORS
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Almost all MPI routines return an error value; C routines as the return result
of the function and Fortran routines in the last argument.
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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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\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.
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\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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\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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\fI\%MPI_Session_init\fP
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.SH COPYRIGHT
2003-2024, The Open MPI Community
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