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CHAP. 6]

The University class is a composite of Department objects. The existence of a department is dependent upon the existence of its university. Therefore, the Department class should be completely controlled and insulated by the University class. This is done by defining it to be a nested private static class at line 2. The University.Department class has two fields: name (a String), and members (a Set of Professors). It includes an add() method at line 11 for adding professors to the department. The University class has two fields: name (a String), and departments (a Map of Department objects, indexed by their names). It includes two add() methods (at lines 28 and 36) and an accessor method that returns the Set of department names (at line 45). Note that the University.Department class is an aggregate of Professor objects. The existence of a professor is independent of his or her department s existence. Therefore, the Professor class is defined separately from the University.Department class.

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

DEADLOCK In the multiprocessing, multithreaded environment, conditions can occur which produce a deadlock, a conflict of needs and allocations that stops all computing. For instance, suppose processes A and B share access to files X and Y, and assume the usual case that when a process opens a file for writing, the operating system gives that process an exclusive lock on the file. Process A opens file X for writing, and then tries to open file Y for writing. Process A cannot open file Y, however, because process B has file Y open for writing, so process A blocks. Then process B tries to open file X for writing. However, process B cannot succeed because process A already has file X open. Now both processes are blocked indefinitely. A deadlock has occurred; the processes are locked in a deadly embrace. Four conditions are necessary for deadlock to occur: 1 2 3 4 Mutual exclusion Hold and wait No preemption Circular wait

public class TestUniversity { public static void main(String[] args) { University jsu = new University("JavaStateUniversity"); Professor adams = new Professor("Adams", Professor.Rank.ASSOC); Professor baker = new Professor("Baker", Professor.Rank.ASST); Professor cohen = new Professor("Cohen", Professor.Rank.PROF); Set<Professor> profs = new HashSet<Professor>(); Collections.addAll(profs, adams, baker, cohen); jsu.addDepartment("Computer Science", profs); Professor davis = new Professor("Davis", Professor.Rank.ASST); Professor evans = new Professor("Evans", Professor.Rank.INSTR); profs.clear(); Collections.addAll(profs, davis, evans, baker); jsu.addDepartment("Biology", profs); adams.setRank(Professor.Rank.PROF); } }

This test program creates the university with two departments, each containing three professors. Note that Prof. Baker is a member of both departments.

By mutual exclusion, we mean that resources are allocated exclusively to one process or another (and throughout this discussion you can substitute thread for process ) If, in the example at the start of this section, the files had been opened in shared mode, mutual exclusion would not apply, and the deadlock would not occur By hold and wait, we mean that a process can continue to hold exclusive access to a resource even as it waits to acquire another If either process in the example had been compelled to release any file it had locked when it requested exclusive access to another file, the deadlock would not occur By no preemption, we mean that the operating system will not force the release of a resource from a blocked process in order to satisfy a demand by another process.

CHAP. 1]

The departments aggregation of professors is evidenced by two features of this program: A professor may belong to more than one department, and a professor s attributes may be changed independently of his or her department: Prof. Adams is promoted to Professor.Rank.PROF at line 15.

If, in the example, the operating system had forced blocked process A to release its control of file X in order to grant access to file X to process B, the deadlock would not occur By circular wait, we mean that there exists some chain of processes waiting for resources such that one process waits for another, which waits for another, etc, until the last process waits for the first again In the example, there are only two processes, and each waits for the other, so the circular wait is a short chain and easy to discern If, on the other hand, process B blocked waiting for some resource held by process C, and C could eventually complete and release the resource required by process B, there would be no circular wait, and the deadlock would not occur.

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