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What does real-time safe means?

Hi,

I have read some ROS tutorials and articles on the web referring to "real-time safe". I do know what "real-time" means but I don't know what "real-time safe" means. Do they have the same meaning? Maybe it is a similar term like "thread safe" but for real-time.

For example this ROS2 article uses it a lot:

https://design.ros2.org/articles/realtime_background.html

Best,