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vnc: return directly if no vnc client connected 

graphic_hw_update and vnc_refresh_server_surface aren't
need to do when no vnc client connected. It can reduce
lock contention, because vnc_refresh will hold global big
lock two millisecond every three seconds.

Signed-off-by: ChenLiang <chenliang88@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
ChenLiang 2014-09-29 15:00:40 +08:00 committed by Gerd Hoffmann
parent e6908bfe8e
commit 9d6b207047
1 changed files with 5 additions and 5 deletions
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10
ui/vnc.c
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@ -2778,6 +2778,11 @@ static void vnc_refresh(DisplayChangeListener *dcl)
VncState *vs, *vn;
int has_dirty, rects = 0;
if (QTAILQ_EMPTY(&vd->clients)) {
update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_MAX);
return;
}
graphic_hw_update(NULL);
if (vnc_trylock_display(vd)) {
@ -2793,11 +2798,6 @@ static void vnc_refresh(DisplayChangeListener *dcl)
/* vs might be free()ed here */
}
if (QTAILQ_EMPTY(&vd->clients)) {
update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_MAX);
return;
}
if (has_dirty && rects) {
vd->dcl.update_interval /= 2;
if (vd->dcl.update_interval < VNC_REFRESH_INTERVAL_BASE) {