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aio-win32: add aio_set_dispatching optimization 

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 11:53:07 +02:00 committed by Stefan Hajnoczi
parent 363285d4b3
commit 0a9dd1664a
1 changed files with 16 additions and 1 deletions
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17
aio-win32.c
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@ -144,12 +144,25 @@ bool aio_poll(AioContext *ctx, bool blocking)
{
AioHandler *node;
HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
bool progress, first;
bool was_dispatching, progress, first;
int count;
int timeout;
was_dispatching = ctx->dispatching;
progress = false;
/* aio_notify can avoid the expensive event_notifier_set if
* everything (file descriptors, bottom halves, timers) will
* be re-evaluated before the next blocking poll(). This is
* already true when aio_poll is called with blocking == false;
* if blocking == true, it is only true after poll() returns.
*
* If we're in a nested event loop, ctx->dispatching might be true.
* In that case we can restore it just before returning, but we
* have to clear it now.
*/
aio_set_dispatching(ctx, !blocking);
ctx->walking_handlers++;
/* fill fd sets */
@ -170,6 +183,7 @@ bool aio_poll(AioContext *ctx, bool blocking)
timeout = blocking
? qemu_timeout_ns_to_ms(aio_compute_timeout(ctx)) : 0;
ret = WaitForMultipleObjects(count, events, FALSE, timeout);
aio_set_dispatching(ctx, true);
if (first && aio_bh_poll(ctx)) {
progress = true;
@ -191,5 +205,6 @@ bool aio_poll(AioContext *ctx, bool blocking)
progress |= timerlistgroup_run_timers(&ctx->tlg);
aio_set_dispatching(ctx, was_dispatching);
return progress;
}