I have a gtkmm application in which there is a running waveform widget (custom of course) which draws a waveform from left to right and in real-time. I feed data to the widget from a timer, which is then stored inside the widget until it is drawn. The drawing operation is triggered from another process (a thread).
When I test the setup in my target (a DirectFB based system), it all goes well. But in my machine (X11) it crashes with the following backtrace <My_App_Name>: xcb_lock.c:33: _XCBUnlockDisplay: Assertion `xcb_get_request_sent(dpy->xcb->connection) == dpy->request' failed. Locking assertion failure. Backtrace: #0 /usr/lib/libxcb-xlib.so.0 [0x11e767] #1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0x11e90e] #2 /usr/lib/libX11.so.6 [0x496159] #3 /usr/lib/libX11.so.6(XUngrabPointer+0x25) [0x48bda5] #4 /usr/lib/libgdk-x11-2.0.so.0(gdk_display_pointer_ungrab+0x99) [0x7d24d09] #5 /usr/lib/libgdk-x11-2.0.so.0(gdk_pointer_ungrab+0x1a) [0x7cffbca] #6 /usr/lib/gtk-2.0/modules/libgnomebreakpad.so [0x84319e] #7 /usr/lib/gtk-2.0/modules/libgnomebreakpad.so [0x8436e5] #8 [0x9c9400] #9 [0x9c9416] #10 /lib/libc.so.6(gsignal+0x50) [0xdd0450] #11 /lib/libc.so.6(abort+0x188) [0xdd1e18] #12 /lib/libc.so.6(__assert_fail+0xee) [0xdc93fe] #13 /usr/lib/libX11.so.6 [0x4960ee] #14 /usr/lib/libXrender.so.1(XRenderCompositeTrapezoids+0x1fc) [0x6bd3bc] #15 /usr/lib/libcairo.so.2 [0x7cb6d87] #16 /usr/lib/libcairo.so.2 [0x7c9b921] #17 /usr/lib/libcairo.so.2 [0x7c9f474] #18 /usr/lib/libcairo.so.2 [0x7c9e547] #19 /usr/lib/libcairo.so.2 [0x7c9ef65] RedWheel: xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed. Multiple segmentation faults occurred; can't display error dialog Any idea what going on? Also when I draw to a surface from another process (which did not create the surface), is there anything else I should be doing. I am using cairo for all my drawing needs.
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