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       MPI_T_pvar_reset -  Reset a performance variable


       int MPI_T_pvar_reset(MPI_T_pvar_session session, MPI_T_pvar_handle handle)


              - identifier of performance experiment session (handle)
       handle - handle of a performance variable (handle)


       The  MPI_T_pvar_reset()  call  sets the performance variable with the handle identified by
       the parameter handle to its starting value. If it is not possible to change the  variable,
       the  function  returns MPI_T_ERR_PVAR_NO_WRITE.  If the constant MPI_T_PVAR_ALL_HANDLES is
       passed in handle, the MPI implementation  attempts  to  reset  all  variables  within  the
       session identified by the parameter session for which handles have been allocated. In this
       case, the routine returns MPI_SUCCESS if all variables are reset  successfully,  otherwise
       MPI_T_ERR_PVAR_NO_WRITE    is    returned.    Readonly    variables   are   ignored   when
       MPI_T_PVAR_ALL_HANDLES is specified.


       This routine is thread-safe.  This means that this routine may be safely used by  multiple
       threads  without the need for any user-provided thread locks.  However, the routine is not
       interrupt safe.  Typically, this is due to the use of memory allocation routines  such  as
       malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.


       All  MPI  routines  (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as
       the value of the function and Fortran routines in the last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler  (for
       communicators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_errhandler (for RMA
       windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use  is  deprecated.
       The  predefined  error  handler  MPI_ERRORS_RETURN may be used to cause error values to be
       returned.  Note that MPI does not guarentee that an  MPI  program  can  continue  past  an
       error; however, MPI implementations will attempt to continue whenever possible.

              - No error; MPI routine completed successfully.
              - The MPI tool information interface is not initialized.
              - Session argument is not valid.
              - The handle is invalid.
              - The performance variable can not be written or reset.

                                            11/9/2015                         MPI_T_pvar_reset(3)