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package sun.jvm.hotspot.utilities;
/** <p> A two-way unbounded-length message queue useful for
communication between threads. Messages written on one side become
readable on the other in first-in, first-out order. This is an
interface to one of two "sides" of an underlying backend, for
example, the MessageQueueBackend. </p> */
public interface MessageQueue {
/** This blocks until a message is available. Even if the thread is
interrupted while it is waiting, this will not return until a
message is written by the entity on the other side of the
queue. */
public Object readMessage();
/** This blocks for up to <code>millis</code> milliseconds until a
message is available. If no message becomes available within
this time period, or the thread is interrupted during the wait,
returns null. (This implies that passing the value null back and
forth is not distinguishable with this method.) Passing a value
of 0 for the <code>millis</code> argument causes this method to
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