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# Date Author Comment
d3fa9230 12/06/2013 05:53 pm Stefan Hajnoczi

aio: make aio_poll(ctx, true) block with no fds

This patch drops a special case where aio_poll(ctx, true) returns false
instead of blocking if no file descriptors are waiting on I/O. Now it
is possible to block in aio_poll() to wait for aio_notify().

This change eliminates busy waiting. bdrv_drain_all() used to rely on...
438e1f47 08/22/2013 08:10 pm Alex Bligh

aio / timers: Convert aio_poll to use AioContext timers' deadline

Convert aio_poll to use deadline based on AioContext's timers.

aio_poll has been changed to return accurately whether progress
has occurred. Prior to this commit, aio_poll always returned...
f2e5dca4 08/19/2013 04:52 pm Stefan Hajnoczi

aio: drop io_flush argument

The .io_flush() handler no longer exists and has no users. Drop the
io_flush argument to aio_set_fd_handler() and related functions.

The AioFlushEventNotifierHandler and AioFlushHandler typedefs are no
longer used and are dropped too....
164a101f 08/19/2013 04:45 pm Stefan Hajnoczi

aio: stop using .io_flush()

Now that aio_poll() users check their termination condition themselves,
it is no longer necessary to call .io_flush() handlers.

The behavior of aio_poll() changes as follows:

1. .io_flush() is no longer invoked and file descriptors are always...
d0c8d2c0 02/22/2013 12:17 am Stefan Hajnoczi

aio: extract aio_dispatch() from aio_poll()

We will need to loop over AioHandlers calling >io_read()/>io_write()
when aio_poll() is converted from select(2) to g_poll(2).

Luckily the code for this already exists, extract it into the new
aio_dispatch() function....
6b5f8762 02/22/2013 12:17 am Stefan Hajnoczi

aio: convert aio_poll() to g_poll(3)

AioHandler already has a GPollFD so we can directly use its
events/revents.

Add the int pollfds_idx field to AioContext so we can map g_poll(3)
results back to AioHandlers.

Reuse aio_dispatch() to invoke handlers after g_poll(3)....
b5a01a70 02/22/2013 12:17 am Stefan Hajnoczi

aio: support G_IO_HUP and G_IO_ERR

aio-posix.c could not take advantage of G_IO_HUP and G_IO_ERR because
select(2) does not have equivalent events. Now that g_poll(3) is used
we can support G_IO_HUP and G_IO_ERR.

Signed-off-by: Stefan Hajnoczi <>...
2ea9b58f 01/17/2013 11:51 am Kevin Wolf

aio: Fix return value of aio_poll()

aio_poll() must return true if any work is still pending, even if it
didn't make progress, so that bdrv_drain_all() doesn't stop waiting too
early. The possibility of stopping early occasionally lead to a failed
assertion in bdrv_drain_all(), when some in-flight request was missed...
1de7afc9 12/19/2012 09:32 am Paolo Bonzini

misc: move include files to include/qemu/

Signed-off-by: Paolo Bonzini <>
737e150e 12/19/2012 09:31 am Paolo Bonzini

block: move include files to include/block/

Signed-off-by: Paolo Bonzini <>
f42b2207 10/30/2012 10:30 am Paolo Bonzini

aio: add Win32 implementation

The Win32 implementation will only accept EventNotifiers, thus a few
drivers are disabled under Windows. EventNotifiers are a good match
for the GSource implementation, too, because the Win32 port of glib
allows to place their HANDLEs in a GPollFD....
e3713e00 10/30/2012 10:30 am Paolo Bonzini

aio: make AioContexts GSources

This lets AioContexts be used (optionally) with a glib main loop.

Signed-off-by: Paolo Bonzini <>
7ed2b24c 10/30/2012 10:30 am Paolo Bonzini

aio: call aio_notify after setting I/O handlers

In the current code, this is done by qemu_set_fd_handler2, which is
called by qemu_aio_set_fd_handler. We need to keep the same behavior
even after removing the call to qemu_set_fd_handler2.

Reviewed-by: Anthony Liguori <>...