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Access contention explanation

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jani12

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Our Advanced Drive Assist System(ADAS) product is based on Two Renesas RH850 / U2A16 Microcontrollers. The programming language is Embedded 'C'.

When register is accessed by multiple interrupts and tasks, perform exclusive control to prevent access contention. When access contention causes no problems (e.g. contention for the same value), describe it.

I understand the first sentence above. Please explain second sentence with at least One example.
 

I believe they mean when two tasks for writing same value to a register.
 

jani12 said:
When access contention causes no problems (e.g. contention for the same value), describe it
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By saying 'describe it' could it mean to add a comment in the code, explaining that you arranged program flow to avoid creating contentions?
 
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