Am 15.06.2010 19:53, schrieb MORITA Kazutaka: > Some block drivers use an aio handler and do I/O completion routines > in it. However, the handler is not invoked if we only do > aio_read/write, because registered fds are not checked at all. > > This patch registers a command processing function as a fd handler to > STDIO, and calls qemu_aio_wait() in command_loop(). Any other > handlers can be invoked when user input is idle. > > Signed-off-by: MORITA Kazutaka <morita.kazut...@lab.ntt.co.jp>
This breaks qemu-iotests. The reason is that synchronous requests get out of order. Previously, do_aio_readv/writev waited until the request was completed, and only afterwards the next command was read from stdio. Now the next command can start during the qemu_aio_wait() that do_aio_readv/writev uses internally to wait. So we either need to deregister the fd handler while a command is running, or (more cleanly) have an async_context_push/pop for any command except aio_*. Kevin
