#include "mpi.h" int MPI_Keyval_create ( copy_fn, delete_fn, keyval, extra_state ) MPI_Copy_function *copy_fn; MPI_Delete_function *delete_fn; int *keyval; void *extra_state;
There are subtle differences between C and Fortran that require that thecopy_fn be written in the same language that MPI_Keyval_createis called from. This should not be a problem for most users; only programers using bothFortran and C in the same program need to be sure that they follow this rule.
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGERin Fortran.
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 lastargument. Before the value is returned, the current MPI error handler iscalled. By default, this error handler aborts the MPI job. The error handlermay be changed with MPI_Errhandler_set; the predefined error handlerMPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue pastan error.