Manpages - MPI_Op_free.3

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

  #include <mpi.h>
  void Op::Free()

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