DMXGetScreenAttributes hangs with pthreads

[Roman Bednarek]

> Roman Bednarek wrote:
>> 
>>    Hello
>>     Quering about DMX screens with DMXGetScreenAttributes hangs when called 
>> for a second screen, after XInitThreads was called and when program is 
>> linked with pthreads. I have attached a small program to show the problem. 
>> It hangs while getting second screen information. I have tested it on few 
>> different systems and it always hanged.
>> 
>>     Roman Bednarek
>
> If you're making Xlib calls from multiple threads, that's probably the issue. 
> Unfortunately, Xlib's threading support is rather unreliable in my 
> experience.  Calling XInitThreads() doesn't seem to help either.
>

    Thanks for a replay. My experience is quite different, our application 
draws to screen from multiple threads without any problems, after calling 
XInitThreads.
    Here situation is quite different, there are no threads at all only a 
query call blocks itself, waiting on a condition variable.

    Roman Bednarek