Created attachment 26551 [details] Example code file for xcb_lock.c error tested with openSUSE 11.1 I use the xorg-x11-libX11 library 7.4-1.29, glibc library 2.9-2.11.1. One thread use the XDrawPoints function to put pixel to the window. An other thread waits with XNextEvent for an event. Every time I produce some events the program stops. Reproducible: Sometimes Steps to Reproduce: 1. translate the xcb_Test.c with gcc -o xcb_Test xcb_Test.c -pthread -I/usr/include/X11 -lX11 2. run the program xcb_Test 3. to tap some keys Actual Results: Every time I produce some events the program stops with xcb_lock.c:33: _XCBUnlockDisplay: Assertion `xcb_get_request_sent(dpy->xcb->connection) == dpy->request' failed. or xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed. In the xorg-x11-libX11-7.4-1.29.src.rpm is the file xcb_lock.c. The file has a line #include <pthread.h> but nothing is used. I can translate the file without this line.
I'm not very familiar with thread stuff, but don't you miss XInitThread?
(In reply to comment #1) > I'm not very familiar with thread stuff, but don't you miss XInitThread? > yes it was my mistake.
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