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aio: avoid livelock behavior for Win32

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The repeated calls to WaitForMultipleObjects may cause a livelock in aio_poll,
where no progress is made on bottom halves.  This patch matches the behavior
of the POSIX code.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-23 15:59:43 +01:00 committed by Anthony Liguori
parent 21022c92dc
commit b022b4a44a
1 changed files with 4 additions and 1 deletions
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5
aio-win32.c
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@ -173,7 +173,7 @@ bool aio_poll(AioContext *ctx, bool blocking)
}
/* wait until next event */
for (;;) {
while (count > 0) {
int timeout = blocking ? INFINITE : 0;
int ret = WaitForMultipleObjects(count, events, FALSE, timeout);
@ -209,6 +209,9 @@ bool aio_poll(AioContext *ctx, bool blocking)
g_free(tmp);
}
}
/* Try again, but only call each handler once. */
events[ret - WAIT_OBJECT_0] = events[--count];
}
return progress;