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RedHat 9 (Linux i386) - man page for mpi_op_free (redhat section 3)

MPI_Op_free(3)				     LAM/MPI				   MPI_Op_free(3)

NAME
       MPI_Op_free -  Frees a user-defined combination function handle

SYNOPSIS
       #include <mpi.h>
       int MPI_Op_free(MPI_Op *op)

INPUT PARAMETER
       op     - operation (handle)

NOTES
       op is set to MPI_OP_NULL on exit.

NULL HANDLES
       The  MPI 1.1 specification, in the section on opaque objects, explicitly disallows freeing
       a null communicator.  The text from the standard is

       "A null handle argument is an erroneous IN argument in MPI calls,
       unless an exception is explicitly stated in the text that defines the
       function. Such exception is allowed for handles to request objects in
       Wait and Test calls (sections Communication Completion and Multiple
       Completions ). Otherwise, a null handle can only be passed to a
       function that allocates a new object and returns a reference to it in
       the handle."

NOTES FOR FORTRAN
       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argu-
       ment ierr at the end of the argument list.  ierr is an integer and has the same meaning as
       the return value of the routine in C.  In Fortran, MPI routines are subroutines,  and  are
       invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS
       If  an  error occurs in an MPI function, the current MPI error handler is called to handle
       it.  By default, this error handler aborts the MPI job.	The error handler may be  changed
       with  MPI_Errhandler_set  ;  the predefined error handler MPI_ERRORS_RETURN may be used to
       cause error values to be returned (in C and Fortran; this error handler is less useful  in
       with  the  C++  MPI  bindings.	The predefined error handler MPI::ERRORS_THROW_EXCEPTIONS
       should be used in C++ if the error value needs to be recovered).  Note that MPI	does  not
       guarantee that an MPI program can continue past an error.

       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.  The C++ bindings for
       MPI  do not return error values; instead, error values are communicated by throwing excep-
       tions of type MPI::Exception (but not by default).  Exceptions  are  only  thrown  if  the
       error value is not MPI::SUCCESS
	.

       Note that if the MPI::ERRORS_RETURN handler is set in C++, while MPI functions will return
       upon an error, there will be no way to recover what the actual error value was.
       MPI_SUCCESS
	      - No error; MPI routine completed successfully.
       MPI_ERR_ARG
	      - Invalid argument.  Some argument is invalid and is not identified by  a  specific
	      error class.  This is typically a NULL pointer or other such error.
       MPI_ERR_ARG
	      -  Invalid argument; the error code associated with this error indicates an attempt
	      to free an MPI permanent operation (e.g., MPI_SUM ).

SEE ALSO
       MPI_Op_create

MORE INFORMATION
       For more information, please see the official MPI Forum web site, which contains the  text
       of both the MPI-1 and MPI-2 standards.  These documents contain detailed information about
       each MPI function (most of which is not duplicated in these man pages).

       http://www.mpi-forum.org/

ACKNOWLEDGEMENTS
       The LAM Team would like the thank the MPICH Team for the handy  program	to  generate  man
       pages  ("doctext"  from ftp://ftp.mcs.anl.gov/pub/sowing/sowing.tar.gz ), the initial for-
       matting, and some initial text for most of the MPI-1 man pages.

LOCATION
       opfree.c

LAM/MPI 6.5.8				    11/10/2002				   MPI_Op_free(3)


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