On 19/12/18 11:05, Li Qiang wrote: > Sent it to qemu-devel. > > Li Qiang <liq...@gmail.com <mailto:liq...@gmail.com>> 于2018年12月19日周 > 三 下午6:04写道： > > Hello Paolo, Stefan, Fam and all, > > Here I have a question about 'aio_poll'. > IIUC the 'aio_poll' is (mostly) used for synchronous IO > as I see a lot of code like this: > while(condition) > aio_poll(); > > However it seems the 'aio_poll' and 'aio_ctx_dispatch' both poll the fd. > So what happened when the 'fd' has events, which function will be > wakeup?
Roughly speaking, aio_poll is used for synchronous IO and within I/O threads; aio_ctx_dispatch is used within the main thread. Both end up calling aio_dispatch_handlers and timerlistgroup_run_timers. Paolo
