Without implementing a complex system such as the node state manager from Genivi, will still need to provide a solution such as:

if a critical application is in a blocking state (e.g. phone call is active) the stopping of the system should be held until the call is terminated or a system timeoff (e.g for battery protection) is triggered.

See use case and presentation.
https://www.genivi.org/sites/default/files/GENIVI_Technical_Webcast%20Lifecycle-20140130.mp4