NAME

       MPI_T_pvar_write -  Write a performance variable

SYNOPSIS

       int MPI_T_pvar_write(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)

INPUT PARAMETERS

       session
              - identifier of performance experiment session (handle)
       handle - handle of a performance variable (handle)
       buf    - initial address of storage location for variable value (choice)

NOTES

       The  MPI_T_pvar_write()  call  attempts  to  write  the value of the performance variable with the handle
       identified by the parameter handle in the session identified by the parameter session. The  value  to  be
       written  is passed in the buffer identified by the parameter buf. The user must ensure that the buffer is
       of the appropriate size to hold the entire value of the performance variable (based on the  datatype  and
       count    returned    by    the    corresponding    previous    calls    to    MPI_T_pvar_get_info()   and
       MPI_T_pvar_handle_alloc(), respectively).

       The constant MPI_T_PVAR_ALL_HANDLES cannot be used as an argument for the function MPI_T_pvar_write().

THREAD AND INTERRUPT SAFETY

       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.

ERRORS

       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.

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

                                                   11/12/2016                                MPI_T_pvar_write(3)