public void Add (Task task)
{
if (task == null)
return;
if (task.Source == null)
throw new Exception ("Attempting to add Task with no source!");
Task old_task = null;
lock (big_lock) {
// Keep track of when immediate priority tasks are
// added so that we can throttle if the scheduler
// is being slammed with them.
if (task.Priority == Priority.Immediate) {
// Shift our times down by one
Array.Copy (last_immediate_times, 1, last_immediate_times, 0, immediate_throttle_count - 1);
last_immediate_times [immediate_throttle_count - 1] = DateTime.Now;
}
old_task = tasks_by_tag [task.Tag] as Task;
task.Schedule (this);
// Re-adding the same task is basically a no-op --- we
// just update the timestamp and return.
if (old_task == task)
return;
if (Debug) {
Logger.Log.Debug ("Adding task {0}", task.Tag);
if (task.Description != null)
Logger.Log.Debug (" Desc: {0}", task.Description);
}
if (task.Priority == Priority.Shutdown)
shutdown_task_queue.Enqueue (task);
else
tasks_by_tag [task.Tag] = task;
Monitor.Pulse (big_lock);
}
// If we clobbered another task, call cancel on it.
// This happens after we release the lock, since
// cancellation could result in a task group post-hook
// being run.
if (old_task != null)
old_task.Cancel ();
}
