DMXGetScreenAttributes hangs with pthreads

[Brian Paul]

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.

-Brian