Il 05/06/2014 20:18, Max Reitz ha scritto:
Why is this design cleaner? Because NBD code doesn't have to worry
about fd handlers. It uses straightforward coroutine send/recv for
socket I/O inside nbd_read_req() and nbd_write_resp(). It's easy to see
that only one coroutine receives from the socket and that only one
coroutine writes to the socket.
Yes, this sounds better. I'll take a look into it and see how far I can
get.
But it doesn't solve any problem, and requires rethinking the
aio_set_fd_handler API. I suggest you just refactor all calls to
qemu_set_fd_handler2 into a function like
qemu_set_fd_handler2(fd, NULL,
nbd_can_read(client) ? nbd_read : NULL,
client->send_coroutine ?
nbd_restart_write : NULL,
opaque);
and call this function every time the result of nbd_can_read() changes.
Then you can switch to aio_set_fd_handler easily.
Paolo
