exchangers: Add table of functions corresponding to send modes.

src/xt_exchanger.c

@@ -220,6 +220,18 @@ xt_exchanger_iter_get_displacement(Xt_exchanger_iter iter)
   return iter->vtable->get_displacement(iter);
 }
 
+const Xt_code_ptr xt_send_func_tab[2][xt_exch_send_comm_mode_count] = {
+  {
+    [xt_exch_send_standard] = (Xt_code_ptr)MPI_Isend,
+    [xt_exch_send_buffered] = (Xt_code_ptr)MPI_Ibsend,
+    [xt_exch_send_synchronous] = (Xt_code_ptr)MPI_Issend,
+  },
+  {
+    [xt_exch_send_standard] = (Xt_code_ptr)MPI_Send,
+    [xt_exch_send_buffered] = (Xt_code_ptr)MPI_Bsend,
+    [xt_exch_send_synchronous] = (Xt_code_ptr)MPI_Ssend,
+  }
+};
 
 /*
  * Local Variables:

src/xt_exchanger_internal.h

@@ -261,7 +261,18 @@ PPM_DSO_INTERNAL void
 xt_msg_params_destruct(size_t n, struct Xt_msg_param *msgs,
                        MPI_Comm comm);
 
+typedef int (*Xt_a_send_func_ptr)
+  (void *buf, int count, MPI_Datatype datatype, int dest,
+   int tag, MPI_Comm comm, MPI_Request *request);
 
+typedef int (*Xt_send_func_ptr)
+  (void *buf, int count, MPI_Datatype datatype, int dest,
+   int tag, MPI_Comm comm);
+
+typedef void (*Xt_code_ptr)(void);
+
+PPM_DSO_INTERNAL extern const Xt_code_ptr
+xt_send_func_tab[2][xt_exch_send_comm_mode_count];
 
 #endif // XT_EXCHANGER_INTERNAL_H
 /*