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package coordination;
import java.lang.String;
class Mutex implements Exclusion {
String[] methodNames;
MethodState[] methodStates;
String prettyName;
Mutex (String[] _methodNames) {
methodNames = _methodNames;
methodStates = new MethodState[methodNames.length];
for (int i = 0; i < methodNames.length; i++) {
methodStates[i] = new MethodState();
}
}
private boolean isMethodIn (String _methodName) {
for (int i = 0; i < methodNames.length; i++) {
if (_methodName.equals(methodNames[i]))
return(true);
}
return(false);
}
private MethodState getMethodState (String _methodName) {
for (int i = 0; i < methodNames.length; i++) {
if (_methodName.equals(methodNames[i]))
return(methodStates[i]);
}
return(null);
}
public boolean testExclusion (String _methodName) {
Thread ct = Thread.currentThread();
//
// Loop through each of the other methods in this exclusion set, to be sure
// that no other thread is running them. Note that we have to be careful
// about selfex.
//
for (int i = 0; i < methodNames.length; i++) {
if (!_methodName.equals(methodNames[i])) {
if (methodStates[i].hasOtherThreadThan(ct))
return(false);
}
}
return (true);
}
public void enterExclusion (String _methodName) {
MethodState methodState = getMethodState(_methodName);
methodState.enterInThread(Thread.currentThread());
}
public void exitExclusion (String _methodName) {
MethodState methodState = getMethodState(_methodName);
methodState.exitInThread(Thread.currentThread());
}
public void printNames() {
System.out.print("Mutex names: ");
for (int i = 0; i < methodNames.length; i++)
System.out.print(methodNames[i] + " ");
System.out.println();
}
}
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