Name: diC59631 Date: 09/29/97


sun.tools.java.CompilerError: copyInline
at sun.tools.tree.TryStatement.copyInline(TryStatement.java:180)
at sun.tools.tree.CompoundStatement.copyInline(CompoundStatement.java:137)
at sun.tools.tree.InlineMethodExpression.copyInline(InlineMethodExpression.java:75)
at sun.tools.tree.MethodExpression.makeVarInits(MethodExpression.java:565)
at sun.tools.tree.MethodExpression.checkValue(MethodExpression.java:304)
at sun.tools.tree.MethodExpression.check(MethodExpression.java:340)
at sun.tools.tree.ExpressionStatement.check(ExpressionStatement.java:46)
at sun.tools.tree.Statement.checkBlockStatement(Statement.java:120)
at sun.tools.tree.CompoundStatement.check(CompoundStatement.java:70)
at sun.tools.tree.Statement.checkMethod(Statement.java:98)
at sun.tools.javac.SourceField.check(SourceField.java:402)
at sun.tools.javac.SourceClass.checkFields(SourceClass.java:852)
at sun.tools.javac.SourceClass.checkInternal(SourceClass.java:615)
at sun.tools.javac.SourceClass.check(SourceClass.java:566)
at sun.tools.javac.Main.compile(Main.java:318)
at sun.tools.javac.Main.main(Main.java:473)
error: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
1 error

 // show the race condition solved by semaphores

class Semaphore {
        public Semaphore(int a) {
        }
        public void up() {
        }
        public void down() {
        }
}
 class Shared3{
  protected int x=0,y=0;
  protected Semaphore mutex;
  { try {
         mutex=new Semaphore(1);
    } catch(Exception e) {
         System.err.println(e);
         System.exit(0);
    }
  }
  public int dif() throws InterruptedException {
         int tmp;
         mutex.down();
         tmp=x-y;
         mutex.up();
         return tmp;
  }
  public void bump() throws InterruptedException {
         mutex.down();
         x++;
         Thread.currentThread().sleep(9);
         y++;
         mutex.up();
  }
 }
 
 class Race3 extends Thread {
  static Shared3 s;
  static boolean done=false;
  public static void main(String[]x) {
         Thread lo=new Race3();
         s=new Shared3();
     try {
         lo.start();
         while (!done) {
                 s.bump();
                 sleep(30);
         }
         lo.join();
     } catch (InterruptedException e) {return;}
  }
  public void run() {
         int i;
     try {
         for (i=0;i<1000;i++) {
                 if (i%60==0) System.out.println();
                 System.out.print(s.dif());
                 sleep(20);
         }
         System.out.println();
         done=true;
     } catch (InterruptedException e) {return;}
  }
 }
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