Posted by Demoscene Passivist on Jul 21, 2010; 5:35pm
URL: https://forum.jogamp.org/Synchronized-buffer-swapping-in-multi-window-application-tp982740p984919.html

Ok, then ur problem (even if u seem to have solved it now) is probably related to OpenGLs really "confusing" multithreading model.

First u should take a look here regarding NEWT: http://jogamp.org/wiki/index.php/Jogl_FAQ#What_is_Newt.27s_Threading_Model_for_native_window_events_.3F

Also u should note that OpenGL is only threadsafe when u use one context per thread. So with two windows u should create two contexts. Two threads rendering in one context usually gives "strange" results. So u could say that OpenGL is more "thread-specific" rather than "thread-safe".

Other than that I would not recommend using multithreading and OpenGL together at all coz in my experience most driver implementations are really fucked up regarding multithreading.

Anyway, as the single thread swap()² method works for u now I would recommend: "Never change a running system!" :)