completion_key 55 opal/mca/event/libevent2022/libevent/event_iocp.c handle_entry(OVERLAPPED *o, ULONG_PTR completion_key, DWORD nBytes, int ok) completion_key 59 opal/mca/event/libevent2022/libevent/event_iocp.c eo->cb(eo, completion_key, nBytes, ok);