private void WaitingQueueToReadyToRun(object sender, System.Timers.ElapsedEventArgs e)
{
Task task;
while (_waitingQueue.TryDequeue(out task))
{
// check budget and invoke a context switch
PeriodicTask headTask;
if (task is PeriodicTask)
{
headTask = (PeriodicTask)task;
var nextToRun = _readyToRunQueue.Peek();
if ((nextToRun != null) && (nextToRun.Status == TaskStatus.WaitingToRun) &&
headTask.Deadline < nextToRun.Deadline)
{
_log.Info("Context switching at: " + DateTime.UtcNow);
var dequeuedTask = _readyToRunQueue.Dequeue();
_readyToRunQueue.Enqueue(headTask);
_readyToRunQueue.Enqueue(dequeuedTask);
}
_readyToRunQueue.Enqueue(headTask);
}
}
}
public PriorityTaskScheduler()
{
//TODO: create category
//_messageCounter = new PerformanceCounter();
_tsp = Convert.ToInt32(ConfigurationManager.AppSettings["TASK_SCHEDULER_PERIOD"]);
_buferSize = Convert.ToInt32(ConfigurationManager.AppSettings["BUFFER_SIZE"]);
_threshold = Convert.ToDouble(ConfigurationManager.AppSettings["SUSPENSION_THRESHOLD"]);
_readyToRunQueue = new BlockingCircularBuffer <PeriodicTask>(_buferSize);
_waitingQueue = new ConcurrentQueue <Task>();
var executor = new System.Timers.Timer(_tsp);
executor.Elapsed += WaitingQueueToReadyToRun;
executor.Start();
for (int i = 0; i < Environment.ProcessorCount; i++)
{
_backgroundTaskFactory.StartNew(() =>
{
while (true)
{
var task = _readyToRunQueue.Dequeue();
#if DEBUG
_log.Debug("Message Dequeued");
//_messageCounter.Decrement();
#endif
if (TryExecuteTask(task))
{
var span = DateTime.UtcNow - task.TimeCreated;
if (DateTime.UtcNow > task.Deadline)
{
_log.Warn(String.Format("Real-time Deadline exceeded : {0}", span.TotalMilliseconds));
//throw new ApplicationException("Real-time Deadline exceeded");
}
#if DEBUG
_log.Debug("Message Done");
#endif
}
}
});
}
}
public PriorityTaskScheduler()
{
//TODO: create category
//_messageCounter = new PerformanceCounter();
_tsp = Convert.ToInt32(ConfigurationManager.AppSettings["TASK_SCHEDULER_PERIOD"]);
_buferSize = Convert.ToInt32(ConfigurationManager.AppSettings["BUFFER_SIZE"]);
_threshold = Convert.ToDouble(ConfigurationManager.AppSettings["SUSPENSION_THRESHOLD"]);
_readyToRunQueue = new BlockingCircularBuffer<PeriodicTask>(_buferSize);
_waitingQueue = new ConcurrentQueue<Task>();
var executor = new System.Timers.Timer(_tsp);
executor.Elapsed += WaitingQueueToReadyToRun;
executor.Start();
for (int i = 0; i < Environment.ProcessorCount; i++)
{
_backgroundTaskFactory.StartNew(() =>
{
while (true)
{
var task = _readyToRunQueue.Dequeue();
#if DEBUG
_log.Debug("Message Dequeued");
//_messageCounter.Decrement();
#endif
if (TryExecuteTask(task))
{
var span = DateTime.UtcNow - task.TimeCreated;
if (DateTime.UtcNow > task.Deadline)
{
_log.Warn(String.Format("Real-time Deadline exceeded : {0}", span.TotalMilliseconds));
//throw new ApplicationException("Real-time Deadline exceeded");
}
#if DEBUG
_log.Debug("Message Done");
#endif
}
}
});
}
}