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| author | Sangho Park <sangho1206.park@samsung.com> | 2014-05-08 12:47:10 +0400 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-05-09 20:57:35 +0200 |
| commit | 5a007547df76446ab891df93ebc55749716609bf (patch) | |
| tree | 22de00b700cd18acc30e65959e6270bf8226a5ea /include | |
| parent | fd040174ac7c302365c1d6dc5646f957972d67d6 (diff) | |
| download | qemu-5a007547df76446ab891df93ebc55749716609bf.zip qemu-5a007547df76446ab891df93ebc55749716609bf.tar.gz qemu-5a007547df76446ab891df93ebc55749716609bf.tar.bz2 | |
glib: fix g_poll early timeout on windows
g_poll has a problem on Windows when using
timeouts < 10ms, in glib/gpoll.c:
/* If not, and we have a significant timeout, poll again with
* timeout then. Note that this will return indication for only
* one event, or only for messages. We ignore timeouts less than
* ten milliseconds as they are mostly pointless on Windows, the
* MsgWaitForMultipleObjectsEx() call will timeout right away
* anyway.
*/
if (retval == 0 && (timeout == INFINITE || timeout >= 10))
retval = poll_rest (poll_msgs, handles, nhandles, fds, nfds, timeout);
so whenever g_poll is called with timeout < 10ms it does
a quick poll instead of wait, this causes significant performance
degradation of QEMU, thus we should use WaitForMultipleObjectsEx
directly
Signed-off-by: Stanislav Vorobiov <s.vorobiov@samsung.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/glib-compat.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/glib-compat.h b/include/glib-compat.h index 8d25900..1280fb2 100644 --- a/include/glib-compat.h +++ b/include/glib-compat.h @@ -24,7 +24,14 @@ static inline guint g_timeout_add_seconds(guint interval, GSourceFunc function, } #endif -#if !GLIB_CHECK_VERSION(2, 20, 0) +#ifdef _WIN32 +/* + * g_poll has a problem on Windows when using + * timeouts < 10ms, so use wrapper. + */ +#define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout) +gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout); +#elif !GLIB_CHECK_VERSION(2, 20, 0) /* * Glib before 2.20.0 doesn't implement g_poll, so wrap it to compile properly * on older systems. |