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Symmetric coroutines are implemented via the Coroutine class. This is used by either subclassing Coroutine and overriding the run method or passing a target Runnable to the Coroutine constructor.

public class Coroutine {
  public Coroutine();
  public Coroutine(Runnable target);
  public Coroutine(long stacksize);
  public Coroutine(Runnable target, long stacksize);

  public static void yield();
  public static void yieldTo(Coroutine target);

  protected void run();
}

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• they are prepared to take an input value and return an output value
• these input and output values are of generic type
• the caller/callee relationship of asymmetric coroutines leads to a differentiation between "calling" a coroutine and "returning" from it
• it implements Iterable so it can be used in for-each loops

public abstract class AsymCoroutine<InT, OutT> implements Iterable<OutT>
{
  public AsymCoroutine();
  public AsymCoroutine(long stacksize);

  public InT ret(OutT value);
  public InT ret();
  public OutT call(InT input);
  public OutT call();

  protected abstract OutT run(InT value);

  @Override
  public Iterator<OutT> iterator();
}

*CoroutineLocal*s CoroutineLocals work like ThreadLocals with the exception that they are scoped to Coroutines.