UCS/ASYNC: Make epoll level-triggered, otherwise it can miss events.
UCS/ASYNC: Make epoll level-triggered, otherwise it can miss events.

 If an event happens just before calling epoll_wait(), it would not
wake up the epoll in the edge-triggered case. A signal mode can get
SIGIO it any time (signals qre queued) but epoll with EPOLLET flag
expects for events only when epoll_wait() is called.

shssf/ucx,shssf/ucx,abouteiller/ucx,sergsagal1/ucx_rocm,abouteiller/ucx,sergsagal1/ucx_rocm,abouteiller/ucx,abouteiller/ucx,shssf/ucx,sergsagal1/ucx_rocm