This is RFC because the APIs it uses (aio_co_schedule/aio_co_wake) do not exist yet in master, but it should be enough for a first review of the QIOChannel API concepts and to give an idea of their usage.
It makes qio_channel_yield aware of AioContexts by adding a new API qio_channel_set_aio_context, and it lets separate coroutines use qio_channel_yield for reading vs. writing. The last patch rewrites the NBD client's I/O management to use the new infrastructure (and I think the logic here was first proposed years ago by Stefan). The benefit is that the new version does not block if the server writes a partial reply header, and is also a bit smaller. Paolo Paolo Bonzini (3): io: add methods to set I/O handlers on AioContext io: make qio_channel_yield aware of AioContexts nbd: do not block on partial reply header reads block/nbd-client.c | 108 ++++++++++++++++++++------------------------------- include/io/channel.h | 41 +++++++++++++++++++ io/channel-socket.c | 16 +++++--- io/channel-tls.c | 12 ++++++ io/channel-watch.c | 6 +++ io/channel.c | 87 +++++++++++++++++++++++++++++++---------- 6 files changed, 178 insertions(+), 92 deletions(-) -- 2.9.3
