JAVA-BASED REAL-TIME PROGRAMMING

The se.lth.cs.realtime package
4.7. Exercise 5 - Mailbox and lab 3 preparation
The realtime package provides a message passing runtime system used by
the classes above. All threads contain a mailbox attribute. Threads check
their own mailboxes using doFetch/tryFetch (blocking/non-blocking) methods.
They post messages to other threads using the putEvent method on the
other thread.
RTThread
Superclass of all thread classes. Used for transactional threads. Note the
mailbox attribute and the interrupt method.
public abstract class RTThread implements Activity , RTEventListener ,
RTEventSource {
}
/** The event input buffer. */
protected volatile RTEventBuffer mailbox;
/**
* Put the time -stamped event in the input buffer of this thread. If the
* buffer is full , the caller is blocked.
*
* @return null , but subclasses are free to return an event if desired to
* inform about blocking or results.
*/
public RTEvent putEvent(RTEvent ev) {
mailbox.doPost(ev);
return null;
}
/**
* Interrupts this thread. Thus an interruption -flag is set , which may
* raise an InterruptedException in the interrupted thread; otherwise the
* flag can be checked via interrupted or isInterrupted.
*/
public void interrupt() { ... }
/**
* Tests if the current thread has been interrupted. The interruption -flag
* is reset.
*
* Note that interrupted is a static method , while
* isInterrupted is called on this Thread instance.
*
* @return true if the current thread has been interrupted;
* false otherwise.
*/
public static boolean interrupted() { ... }
/**
* Tests if this thread is alive. A thread is alive if it has been started
* and has not yet died.
*
* @return true if this thread is alive; false otherwise.
*/
public final boolean isAlive() { ... }
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