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MPI_Op_free - Frees a user-defined combination function handle.
#include <mpi.h>
int MPI_Op_free(MPI_Op *op)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_OP_FREE(OP, IERROR)
INTEGER OP, IERROR
USE mpi_f08
MPI_Op_free(op, ierror)
TYPE(MPI_Op), INTENT(INOUT) :: op
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- op
- Operation (handle).
- IERROR
- Fortran
only: Error status (integer).
Marks a user-defined reduction
operation for deallocation and sets op to MPI_OP_NULL.
Almost all
MPI routines return an error value; C routines as the value of the function
and Fortran routines in the last argument. C++ functions 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.
MPI_Op_create
MPI_Reduce
MPI_Allreduce
MPI_Reduce_scatter
MPI_Scan
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