- SIMIX_req_comm_isend(mailbox, request->size, -1.0,
- request->buf, request->size, &match_send, request,
+ simcall_comm_isend(mailbox, request->size, -1.0,
+ request->buf, request->size,
+ &match_send,
+ &smpi_mpi_request_free_voidp, // how to free the userdata if a detached send fails
+ request,