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CPTS 483 HW#3 Possible Solutions

CPTS 483 HW#3 Possible Solutions. Presented by- Shariful Hasan Shaikot TA CPTS 483. getInstance method is not synchronized check-then-act race condition. setStop (…) function assigns values to two related volatile fields in the simulatorThread object.

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CPTS 483 HW#3 Possible Solutions

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  1. CPTS 483HW#3 Possible Solutions Presented by-SharifulHasanShaikotTA CPTS 483

  2. getInstance method is not synchronized • check-then-act race condition

  3. setStop(…) function assigns values to two related volatile fields in the simulatorThread object. • If the thread were pre‐empted between lines 221 and 222…then ??? • These member variables need to be assigned and read under a common lock.

  4. the yield() call will allow the main thread to run so that the GUI can get set before the simulation thread begins execution. • can never be guaranteed because it is running asynchronously to the SimThread. • Since it cannot be guaranteed, this is not thread‐safe.

  5. Thank you for listening

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