code: def _get_osmesa_windows():
      return [
          win
          for win in _VP_OSMESA_ALL_WINDOWS
          if isinstance(win, CanvasBackend)
      ]
  
imports: from __future__ import division
  from ...util.ptime import time
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...gloo import gl
  from time import sleep
label_desc: Use image node_id 1 for calling a global function with example usage: _get_osmesa_windows() and returns: unknown