Re: [Qemu-devel] RFC: running the user interface in a thread ...

[Gerd Hoffmann]

  Hi,

> That sounds good in theory (but see below) since AioContext integrates
> with the glib main loop because it is a GSource.  QEMU code should use
> AioContext where we have high resolution timers and APIs for file
> descriptor, EventNotifier, and BH.

Sounds good.

> Use BH or EventNotifier instead.  BH has optimizations to avoid syscalls
> where possible while EventNotifier is just a plain eventfd/pipe
> (requires a write() syscall for each notification).

How does BH signaling work?  I know I can qemu_bh_schedule from !main
thread to kick BH in main thread context.  The other way around works
using aio_bh_new + aio_bh_call I guess?

thanks,
  Gerd