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DescriptionQ958
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Q958DVASIC interview problem

Control a background process lifecycle

TechniquesConcurrencyprocessjoin_none
DifficultyMedium
TopicTemporal Checks
LanguageSystemVerilog
Requirements3 checkpoints
01

Problem

Start a polling task in the background and later stop exactly that task through a stored process handle.

Example input and output

Use this case to check your interpretation
Input
call start(), start(), stop(), stop()
Output
one worker starts; second start is ignored; first stop kills that owned worker; final stop is a safe no-op
Explanation

Publishing the stored process handle before start returns removes the initialization race and targets only the intended background task.

02

Requirements (3)

  • Starting the worker must not leave the caller racing an uninitialized handle.
  • Ignore a second start while the worker is already active.
  • Stopping must be safe when no worker is active.