Interaction with Xodus

• Xodus introduces another degree of parallelism via the X11 event processing mechanism. PGENESIS periodically instructs the X Server to process any X events. Some of those events may result in some script code being run.
• Race condition: processing order is unpredictable.
  • Safe 1: ensure all affected nodes are at a barrier (or equivalent)
  • Safe 2: ensure mouse/keyboard events do not cause remote operations that require the participation of another node.

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