X11 doesn't like creating and destroying a lot of windows

[tomaka]

Original: rust-windowing/glutin#89

[bvssvni]

Could this be caused by PistonDevelopers/piston_window#215 (comment) ?

@bvssvni looks to be happening in the winit's X11 window destructor. PoisonError is for mutex being locked twice without unlocking. I suggest filing an issue to winit.

cc @kvark

[tomaka]

No, this is unrelated. I just realized that this issue doesn't give any detail. Creating and destroying lots of windows caused a segfault if I remember correctly, and not a Rust panic. But since the X11 backend has received a lot of changes over time, someone should check if it can still be reproduced.

[bvssvni]

I opened up a new issue #347

[francesca64]

Opening and closing 100 windows in rapid succession seems to be fine. As for the original repro of calling cargo test with glium, that SIGSEGVs as soon as it hits the framebuffer tests, though I'm not sure if it's related.