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aio-win32: add support for sockets

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Uses the same select/WSAEventSelect scheme as main-loop.c.
WSAEventSelect() is edge-triggered, so it cannot be used
directly, but it is still used as a way to exit from a
blocking g_poll().

Before g_poll() is called, we poll sockets with a non-blocking
select() to achieve the level-triggered semantics we require:
if a socket is ready, the g_poll() is made non-blocking too.

Based on a patch from Or Goshen.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-07-09 11:53:10 +02:00 • committed by Stefan Hajnoczi
parent 79d9b6566b
commit b493317d34
3 changed files with 145 additions and 9 deletions
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2
include/block/aio.h
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@ -239,7 +239,6 @@ bool aio_dispatch(AioContext *ctx);
*/
bool aio_poll(AioContext *ctx, bool blocking);
#ifdef CONFIG_POSIX
/* Register a file descriptor and associated callbacks. Behaves very similarly
* to qemu_set_fd_handler2. Unlike qemu_set_fd_handler2, these callbacks will
* be invoked when using aio_poll().
@ -252,7 +251,6 @@ void aio_set_fd_handler(AioContext *ctx,
IOHandler *io_read,
IOHandler *io_write,
void *opaque);
#endif
/* Register an event notifier and associated callbacks. Behaves very similarly
* to event_notifier_set_handler. Unlike event_notifier_set_handler, these callbacks