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wayland: Compare serial numbers correctly to avoid overflow problems

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We have to look at the difference between two numbers, which will always
be well-defined and give the right result, even in case of integer overflow.
This commit is contained in:
Kristian Høgsberg 2013-08-23 23:08:13 -07:00
parent 384a4e6ddb
commit 771dbe0592
1 changed files with 5 additions and 1 deletions
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6
gdk/wayland/gdkdisplay-wayland.c
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@ -678,8 +678,12 @@ void
_gdk_wayland_display_update_serial (GdkWaylandDisplay *wayland_display, _gdk_wayland_display_update_serial (GdkWaylandDisplay *wayland_display,
guint32 serial) guint32 serial)
{ {
if (serial > wayland_display->serial) if (serial - wayland_display->serial < 1000)
wayland_display->serial = serial; wayland_display->serial = serial;
else
g_warning (G_STRLOC ": serial number jump bigger than 1000 (%u -> %u",
wayland_display->serial, serial);
} }
/** /**