#228 Loading textures from another thread causes segfault

[Anonymous]

Whenever I try to load or unload textures from a different thread than the main one, I get a segmentation fault in an PyOpenGL call, even if PyOpenGL calls are properly protected by locking. Loading and unloading textures from a different thread is necessary for my project, a high-performance image viewer.

I'm using PyOpenGL 3.0.1~b2-1 with PyGame 1.8.1release-1.1+b1 from Debian Sid with an nVidia graphics card with the official driver (190.53) on GNU/Linux 2.6.31. I've also verified the problem with PyOpenGL and PyGame in Ubuntu GNU/Linux 8.04 Hardy with the official stable packages using an ATi embedded graphics card with the free software ati driver.

I've crafted a program to demonstrate it, which I'm attaching to this bug in tar+gzip format. Upon uncompressing the file you'll get a directory; inside it you'll find a Python program and a PNG image it'll load. First it'll load and move it around for 4 seconds in the main thread, which you'll see working fine. Then it'll do exactly the same, only the image is loaded in a second thread and shared with the first one. Before the first thread resumes control, however, it'll crash, right in glGenTextures.

[Anonymous]

Demonstration program (crashes)