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This code says: While testAndSet returns false (!testAndSet), do nothing When testAndSet returns true, do whatever needs to be done in the critical section (Note that the locking variable is now set true, and competing processes using the same testAndSet routine will have to wait) When the critical section is complete, indicate that by changing thisLock, the locking variable, to false Because the test-and-set instruction requires a busy wait, it often is not the best choice of synchronization mechanism However, this approach is quite useful for coordinating threads in an operating system on a multiprocessor machine The effect of the busy wait is much less onerous when the waiting thread has its own processor, and the wait is not likely to be long There are other variations on the test-and-set instruction idea.

int capacity = 101; int size = 0; float load = 0.75F; LinkedList[] buckets;

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A swap or exchange instruction that atomically (without interruption) exchanges the values of two arguments can be used the same way Here is pseudocode for a swap instruction: void swap(boolean a, boolean b) { boolean temp = a; a = b; b = temp; } This code says: Given two boolean values (a and b can each be either true or false), exchange the two values, using the variable temp for temporary storage (The void means that this routine does not return any value It simply swaps a and b) Application code such as the following uses the swap instruction:.

HashTable() { buckets = new LinkedList[capacity]; for (int i = 0; i < capacity; i++) { buckets[i] = new LinkedList(); } } HashTable(int capacity, float load) { this(); this.capacity = capacity; this.load = load; } Object put(Object key, Object value) { int h = hash(key); LinkedList bucket=buckets[h]; Object oldValue = null; for (ListIterator it = bucket.iterator(); it.hasNext(); ) { Map.Entry entry = it.next(); if (entry.getKey().equals(key)) { break; } } if (entry.getKey().equals(key)) { oldValue = entry.setValue(value); } else { bucket.add(new Entry(key,value)); } return oldValue; } // more methods... }

Note that put() serves two different purposes. If the table already has an entry with the given key, it only changes the value of that entry. Otherwise, it adds a new entry with that key/value pair.

boolean lock;

The java.util.HashMap class uses separate chaining in a way that is similar to that shown in Example 8.8. APPLICATIONS Tables are widely used in systems programming. Moreover, they are the primary building blocks of relational databases. Here is an example in applications programming. EXAMPLE 8.9 A Concordance

A concordance is a list of words that appear in a text document along with the numbers of the lines on which the words appear. It is just like an index of a book except that it lists line numbers instead of page

// shared data; initialized to 'false'

numbers. Concordances are useful for analyzing documents to find word frequencies and associations that are not evident from reading the document directly. This program builds a concordance for a text file. The run here uses this particular text taken from Shakespeare s play Julius Caesar. The first part of the resulting concordance is shown on the right. This output results from obtaining a Set view of the concordance and then iterating through the set, printing one element per line. Each element is a Map.Entry object whose Key is the word from the text (in all uppercase letters) and whose Value is the listing of line numbers where the word was found. For example, the word man was found on lines 10, 15, 22, and 27. Line 10 is

For Brutus is an honourable man; Here is the Concordance class: 1 public class Concordance { 2 private Map<String,String> map = new HashMap<String,String>();

boolean key = true; // not shared; used for this thread only . . . //Wait until key becomes false, which means lock was false while ( key ) swap(lock, key); /* critical section */ ... / Now free the lock / lock = false; ... /* remainder section */ . . . This code says: While the variable key is true, swap the values of key and lock. (When key becomes false, it will mean that lock was false, and because key was true before, lock will now be true.) When key becomes false, execute the critical section. When the critical section is complete, release the lock by setting it back to false. The swap instruction has the same applications and limitations as the test-and-set.

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