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NAME
MPI_Op_free - Frees a user-defined combination function handle.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Op_free(MPI_Op *op)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_OP_FREE(OP, IERROR)
INTEGER OP, IERROR
C++ Syntax
#include <mpi.h>
void Op::Free()
INPUT/OUTPUT PARAMETER
op Operation (handle).
OUTPUT PARAMETER
IERROR Fortran only: Error status (integer).
DESCRIPTION
Marks a user-defined reduction operation for deallocation and sets op
to MPI_OP_NULL.
ERRORS
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument. C++ func-
tions do not return errors. If the default error handler is set to
MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
will be used to throw an MPI:Exception object.
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with
MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN
may be used to cause error values to be returned. Note that MPI does
not guarantee that an MPI program can continue past an error.
SEE ALSO
MPI_Op_create
MPI_Reduce
MPI_Allreduce
MPI_Reduce_scatter
MPI_Scan
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