MPI_Errhandler *MPI_ERRORS_ARE_FATAL = nullptr;
MPI_Errhandler *MPI_ERRHANDLER_NULL = nullptr;
+void (*smpi_comm_copy_data_callback) (smx_activity_t, void*, size_t) = &smpi_comm_copy_buffer_callback;
+
#define MAILBOX_NAME_MAXLEN (5 + sizeof(int) * 2 + 1)
static char *get_mailbox_name(char *str, int index)