plucky (3) MPI_Session_finalize.openmpi.3.gz

SYNTAX

   C Syntax
          #include <mpi.h>

          int MPI_Session_finalize(MPI_Session *session)

   Fortran Syntax
          USE MPI
          ! or the older form: INCLUDE 'mpif.h'

          MPI_SESSION_FINALIZE(SESSION, IERROR)
              INTEGER SESSION, IERROR

   Fortran 2008 Syntax
          USE mpi_f08

          MPI_Session_finalize(session, ierror)
              TYPE(MPI_Session), INTENT(IN) :: session
              INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

       • session : session to be finalized (handle)

OUTPUT PARAMETERS

       • ierror : Fortran only: Error status (integer).

DESCRIPTION

       MPI_Session_finalize  releases  all  MPI  state  associated with the supplied session. Every instantiated
       session must be finalized using MPI_Session_finalize. The handle session is set  to  MPI_SESSION_NULL  by
       the call.

NOTES

       Before  an  MPI  process  invokes  MPI_Session_finalize, 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 MPI_Session_finalize does not free objects created by MPI calls; these objects are
       freed  using  MPI_XXX_FREE  calls.  MPI_Session_finalize 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 MPI_Session_finalize procedure. MPI_Session_finalize behaves as
       if all such synchronizations occur concurrently. As MPI_Comm_free may mark  a  communicator  for  freeing
       later, MPI_Session_finalize 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).

ERRORS

       Almost all MPI routines return an error value; C routines as  the  return  result  of  the  function  and
       Fortran routines in the last argument.

       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_thread,   after
       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 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_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.

       Open MPI includes three predefined error handlers that can be used:

       • MPI_ERRORS_ARE_FATAL Causes the program to abort all connected MPI processes.

       • MPI_ERRORS_ABORT 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 was called on that communicator. If called on a
         window or file, acts as if 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.

       • MPI_ERRORS_RETURN Returns an error code to the application.

       MPI applications can also implement their own error handlers by calling:

       • MPI_Comm_create_errhandler then MPI_Comm_set_errhandler

       • MPI_File_create_errhandler then MPI_File_set_errhandler

       • MPI_Session_create_errhandler then MPI_Session_set_errhandler or at MPI_Session_init

       • MPI_Win_create_errhandler then MPI_Win_set_errhandler

       Note that MPI does not guarantee that an MPI program can continue past an error.

       See the MPI man page for a full list of MPI error codes.

       See the Error Handling section of the MPI-3.1 standard for more information.

       SEE ALSO:
          MPI_Session_init

COPYRIGHT

       2003-2025, The Open MPI Community

                                                  Feb 17, 2025                           MPI_SESSION_FINALIZE(3)