Ejemplo n.º 1
0
 /** Let go of the thread from sleep in idle. */
 public void kill() {
   if (isAlive()) interrupt();
   else aruntime.remove(this);
 }
Ejemplo n.º 2
0
  /** Standard Thread.run(). */
  public /*final*/ void run() {
    if (Thread.currentThread() != this) {
      throw new WorkerThreadException(
          "not run() by the owning thread.  Current thread:"
              + Thread.currentThread()
              + "---owning thread:"
              + this);
    }

    try {
      if (aruntime.debug && aruntime.isDebugEnabledAt(ARuntime.Debug_THREAD))
        aruntime.println(ARuntime.Debug_THREAD, this, "THREAD STARTS");

      for (; ; ) {

        // Note:
        // getTask() and recycle() must happen atomically because
        // during the time after this thread cannot get more tasks
        // from runtime.getTask() and before it goes to recycle() to
        // return workforce, another thread may produce a new task in
        // the ready queue (without this thread knowing it) and that
        // thread goes to the waiting state.  Due to this racing,
        // the simulation could be stalled as no thread is actively
        // running to execute the new task in the ready queue.
        synchronized (aruntime) {
          if (mainContext == null || mainContext == DUMMY_CONTEXT) {
            // grab a task from worker pool
            nextTask = GETTING_TASK;
            // XXX: temporary for debug
            nextTask = aruntime.getTask(mainContext == null);
            if (nextTask != null) {
              // so null wont override DUMMY_CONTEXT
              mainContext = nextTask;
              nextTask = null;
            } else {
              setState(State_RECYCLING);
              sleepOn = this;
              aruntime.recycle(this);
              // return workforce in recycle()
            }
          }
        }

        if (state == State_RECYCLING) {
          setState(State_INACTIVE);
          // BOOKMARK1:
          // At this point, other threads may assign a new task
          // to this thread and start this thread, so check if
          // mainContext is being assigned within
          // the following synchronized claus
          synchronized (this) {
            if (mainContext == DUMMY_CONTEXT) mainContext = null;

            if (mainContext == null) {
              __sleepOn(this, State_INACTIVE, State_INACTIVE);
              continue;
            } else sleepOn = null;
          }
        }

        if (runtime.resetting) {
          throw new WorkerThreadInterruptedException();
        } else if (aruntime.isSuspend()) {
          // go into sleep if runtime is suspended
          synchronized (this) {
            __sleepOn(this, State_PREACTIVE, State_ACTIVE);
          }
        }

        if (mainContext.threadGroup != null) {
          if (mainContext instanceof TaskNotify) {
            // mainContext is TaskNotify:
            // the object to be notified on is in "data"
            synchronized (mainContext.data) {
              if (aruntime.debug && aruntime.isDebugEnabledAt(ARuntime.Debug_THREAD))
                aruntime.println(
                    ARuntime.Debug_THREAD,
                    this,
                    "EXECUTING notify:" + mainContext.data + "," + System.currentTimeMillis());
              mainContext.data.notify();
              aruntime.nthreadsWaiting--;
            }
            mainContext = null;
            // workforce transfered to the waked up thread
            continue;
          } else if (getThreadGroup() != mainContext.threadGroup) {
            aruntime.immediatelyStart(mainContext);
            mainContext = null;
            // workforce transfered to new thread
            continue;
          }
        }

        if (aruntime.debug && aruntime.isDebugEnabledAt(ARuntime.Debug_THREAD))
          aruntime.println(ARuntime.Debug_THREAD, this, "EXECUTING:" + mainContext);

        setState(State_ACTIVE);

        // runtime.runCheck(this);
        String method_ = "process()";
        currentContext = mainContext;
        returnPort = currentContext.returnPort;
        // from server port, new context
        try {
          mainContext.execute(this);
        } catch (NullPointerException e_) {
          if (runtime == null) return;
          e_.printStackTrace();
          drcl.Debug.error(info());
        } catch (Exception e_) {
          e_.printStackTrace();
          drcl.Debug.error(info());
        } catch (SendReceiveException e_) {
          e_.printStackTrace();
          drcl.Debug.error(info());
        }
        currentContext.port = null;
        currentContext.data = null;

        finishing();
        mainContext = DUMMY_CONTEXT;
        // to maintain the ownership of workforce

        if (!RECYCLING) {
          aruntime.remove(this);
          break;
        }

        if (nextTask != null) {
          // error checking
          if (mainContext != null && mainContext != DUMMY_CONTEXT)
            drcl.Debug.systemFatalError("task assigned to occupied thread:" + this);
          mainContext = nextTask;
          nextTask = null;
        }
      } // for(;;)
      drcl.Debug.systemFatalError("Unexpected finish at " + this);
    } catch (WorkerThreadInterruptedException e_) {
      // if (!runtime.resetting) {
      //  e_.printStackTrace();
      //  drcl.Debug.systemFatalError(
      //    "AWorkerThread terminates abnormally, " + this
      //      + "\nManager: " + runtime.diag());
      // }
      // Will releaseAllLocks()/cancelAllWaits() clean up the lock
      //   structure in components?
      // Not if the thread comes across multiple components...
      if (mainContext != null && mainContext.port != null) releaseAllLocks(mainContext.port.host);
      aruntime.remove(this);
    } catch (NullPointerException e_) {
      if (runtime != null) {
        e_.printStackTrace();
        drcl.Debug.error(info());
      }
    }
    runtime = null; // become an orphan
    aruntime = null;
  }