Java Await statement - Concurrent programming

Question

I have a question that has been given out by our lecturer. It refers to cars waiting to get onto a roundabout so that the roundabout does not clog up. He has supposedly given us a method to solve this using "await( BS)" statements and asked us to convert it to using semaphores, however the code he has given does not compute lol. I dont know what he was playing at but it doesnt make sense in Java.... can anyone help me translate this....

package roundabout;
public class roundabout01
{
Process main;
{
/* declare and initialize global variables */
int NUMBER_OF_CARS = 20;
int numberOnRoundabout = 0;
/* slots on the roundabout */
String slots [] = {"[.....]", "[.....]", "[.....]", "[.....]", "[.....]", "[.....]"};
/* create and set the cars moving */
for (int count = 1; NUMBER_OF_CARS < 6; count++);
{
int entry = 3;
int exit = 3;
carProcess(entry, exit);
// end for; /*end main process*/
}
Process carProcess (int s, int t);
{
<await((numberOnRoundabout<=6), numberOnRoundabout++)>; /* Wait if roundabout crowded*/
/* wait for clearance before moving on to the roundabout */
<await(slots[2..s]=="[.....]"); AND (slots[2..s + 7] mod 8 == "[.....]");
slots[2..s]="["+entry+"-->"+exit+"]";
int currentPosition = 2*s;
int nextPosition = 2*s+1; /* move around to exit position (which is 2t) */
}
do
{
<await(slots[nextPosition]="[.....]");
slots[nextPosition]=slots[currentPosition];
slots[currentPosition]="[.....]">
currentPosition != nextPosition;
nextPosition = (nextPosition + 1) mod 8;
}
while (currentPosition != 2*t);
{
slots[currentPosition]="[.....]";
numberOnRoundabout -- ; /* move off the roundabout */
End carProcess;
}
}
}

Thanks in advance for any help!

Answer 1

What he eventually told us is that the question he gave us was from years ago. The code in the question is redundent Java. For anybody else with a douce of a teacher, when this format of code comes up "await((numberOnRoundabout<=6), numberOnRoundabout++)" it is old Java. Translated it will be a series of thread objects created with the conditions set within them.

eg

public synchronized void myStop() {
      this.runningFlag=false;
      t.interrupt();
      } // end myStart

I do hope nobody needs this information! Ever!