How to use

DebuggerTester$ExecutingLoop

in

com.oracle.truffle.tck

/**
 * Constructs a new debugger tester instance with a pre-set context builder.
 *
 * @param contextBuilder a pre-set context builder. Only out and err streams are set on this
 *            builder prior the {@link Context} instance creation.
 *
 * @see #DebuggerTester()
 * @since 0.31
 */
public DebuggerTester(Context.Builder contextBuilder) {
  this.newEvent = new ArrayBlockingQueue<>(1);
  this.executing = new Semaphore(0);
  this.initialized = new Semaphore(0);
  final AtomicReference<Engine> engineRef = new AtomicReference<>();
  final AtomicReference<Throwable> error = new AtomicReference<>();
  this.executingLoop = new ExecutingLoop(contextBuilder, engineRef, error);
  this.evalThread = new Thread(executingLoop);
  this.evalThread.start();
  try {
    initialized.acquire();
  } catch (InterruptedException e) {
    throw new AssertionError(e);
  }
  this.engine = engineRef.get();
  if (error.get() != null) {
    throw new AssertionError("Engine initialization failed", error.get());
  }
}

/**
 * Constructs a new debugger tester instance with a pre-set context builder.
 *
 * @param contextBuilder a pre-set context builder. Only out and err streams are set on this
 *            builder prior the {@link Context} instance creation.
 *
 * @see #DebuggerTester()
 * @since 0.31
 */
public DebuggerTester(Context.Builder contextBuilder) {
  this.newEvent = new ArrayBlockingQueue<>(1);
  this.executing = new Semaphore(0);
  this.initialized = new Semaphore(0);
  final AtomicReference<Engine> engineRef = new AtomicReference<>();
  final AtomicReference<Throwable> error = new AtomicReference<>();
  this.executingLoop = new ExecutingLoop(contextBuilder, engineRef, error);
  this.evalThread = new Thread(executingLoop);
  this.evalThread.start();
  try {
    initialized.acquire();
  } catch (InterruptedException e) {
    throw new AssertionError(e);
  }
  this.engine = engineRef.get();
  if (error.get() != null) {
    throw new AssertionError("Engine initialization failed", error.get());
  }
}