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Mutex

Mutex. Kevin O’Gorman CS 170 22 April 2002. Mutex. A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement. B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal()

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Mutex

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  1. Mutex Kevin O’Gorman CS 170 22 April 2002

  2. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 1000 mutex = 1

  3. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 1000 mutex = 1

  4. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 1000 mutex = 0

  5. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 800 mutex = 0

  6. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 800 mutex = 0

  7. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 800 mutex = -1

  8. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 800 mutex = -1

  9. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 800 mutex = 0

  10. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 800 mutex = 0

  11. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 800 mutex = 0

  12. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 600 mutex = 0

  13. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 600 mutex = 1

  14. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 600 mutex = 1

  15. Mutex A1 statement A2 mutex.wait() A3 wolski.balance = wolski balance - 200 A4 mutex.signal() A5 statement B1 statement B2 mutex.wait() B3 wolski.balance = wolski balance - 200 B4 mutex.signal() B5 statement balance = 600 Success!!

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