glXChannelRectSyncSGIX() crash: driver 100.14.19

[pixelhead]

Hi -

I'm encountering an Xlib error that seems to be originating from glXChannelRectSyncSGIX() in libGL.

The error occurs after my app launches a Tcl/Tk file browser (via tk_getOpenFile -multiple) to select a file. After the "OK" button is clicked, the program crashes on the X Error (glXBadContextTag).

A couple of things:

1) I am using multiple threads and glXContexts. When loading data, one thread reads and loads the data while another thread refreshes the OpenGL window (rendering context sharing is enabled).
2) If I use single thread, everything works fine.
3) Also tried using GTK and got the same error.

From the XError, I'm guessing that when the Tcl/Tk window closes it is somehow screwing up the current rendering context so when the other thread tries to render it has a bad context?

Anyone have any idea how to fix this?

Thanks.

[AaronP]

Did you remember to call XInitThreads? Also, are you sure that the same context is never current in two threads at once?

[pixelhead]

Ah, I was missing XInitThreads(). Thanks very much! Things are working much better now.