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prac7-soln-fall09-java14

# prac7-soln-fall09-java14 - CMSC330 Fall 2009 Practice 7...

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CMSC330 Fall 2009 Practice 7 Solutions (Java 1.4) 1. Multithreading, Data Races, and Deadlock a. For the following program, give two schedules under which the final value of i differs in the two schedules. Give the schedule as a list of line numbers, and in each case, also give the final value of i. l = new Object(); m = new Object(); i = 0; Thread 1 1. synchronized(l) { 2. i = 3; 3. } Thread 2 4. synchronized (m) { 5. i = i + 1; 6. } Since l and m are different locks, they do not provide any mutual exclusion in this example, and the threads may be interleaved arbitrarily. Some example solutions: 1, 2, 3, 4, 5, 6 - i = 4 1, 4, 5, 2, 3, 6 - i = 3

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