/// <summary>
/// Execute a task in synchronized manner.
/// </summary>
/// <param name="task">Task to start</param>
/// <param name="action">DuplicateTaskQueued</param>
/// <returns>An Exception object on any failure within the task,
/// or null if the task was successfully finished or cancelled.</returns>
public static Exception RunTaskSynchronized(ThreadWorkerTaskBase task, DuplicateTaskQueued action)
{
if (IsTaskQueued(task.TaskID))
{
if (action == DuplicateTaskQueued.Ignore)
{
return(null);
}
if (action != DuplicateTaskQueued.Allowed) // wait, or abort running task thread
{
if (action == DuplicateTaskQueued.Abort)
{
AbortTask(task.TaskID);
}
if (action != DuplicateTaskQueued.Wait)
{
WaitForTask(task.TaskID);
}
}
}
ThreadWorkerBase wc = task.GetWorkerInstance();
queuedTasks.Add(task.TaskID, task);
try {
return(wc.LocalRunProcess());
} finally {
queuedTasks.Remove(task);
}
}
/// <summary>
/// Queue a task using a freshly created Thread.
/// </summary>
/// <param name="task">Task to start</param>
/// <param name="action">DuplicateTaskQueued</param>
/// <returns>True, if the task was successfully started, else false.</returns>
public static bool StartTask(ThreadWorkerTaskBase task, DuplicateTaskQueued action)
{
if (waitForGlobalThreadResource)
{
// delay startup of the thread
if (IsTaskWaitingForGlobalThreadResource(task.TaskID))
{
if (action == DuplicateTaskQueued.Ignore)
{
return(false);
}
if (action != DuplicateTaskQueued.Allowed)
{
return(false); // we do not have to wait/abort, they are not yet even started anyway
}
}
TaskStartInfo startInfo = new TaskStartInfo(TaskStartInfo.StartMethod.ThreadStart, task, action);
taskStartInfos.Enqueue(startInfo);
return(true);
}
if (IsTaskQueued(task.TaskID))
{
if (action == DuplicateTaskQueued.Ignore)
{
return(false);
}
if (action != DuplicateTaskQueued.Allowed) // wait, or abort running task thread
{
if (action == DuplicateTaskQueued.Abort)
{
AbortTask(task.TaskID);
}
if (action != DuplicateTaskQueued.Wait)
{
WaitForTask(task.TaskID);
}
}
}
ThreadWorkerBase wc = task.GetWorkerInstance();
Thread t = new Thread(new ThreadStart(wc.RunProcess));
t.IsBackground = true; //make them a daemon - prevent thread callback issues
task.WorkerThread = t;
t.Start();
queuedTasks.Add(task.TaskID, task);
return(true);
}
/// <summary>
/// Queue a task using ThreadPool.
/// </summary>
/// <param name="task">Task to start</param>
/// <param name="action">Duplicate task action</param>
/// <returns>True, if the task was successfully queued up
/// to the ThreadPool, else false.</returns>
public static bool QueueTask(ThreadWorkerTaskBase task, DuplicateTaskQueued action)
{
if (waitForGlobalThreadResource)
{
// delay startup of the thread
if (IsTaskWaitingForGlobalThreadResource(task.TaskID))
{
if (action == DuplicateTaskQueued.Ignore)
{
return(false); // yet waiting
}
if (action != DuplicateTaskQueued.Allowed)
{
return(false); // we do not have to wait/abort, they are not yet even started anyway
}
}
TaskStartInfo startInfo = new TaskStartInfo(TaskStartInfo.StartMethod.ThreadPool, task, action);
taskStartInfos.Enqueue(startInfo);
return(true);
}
if (IsTaskQueued(task.TaskID))
{
if (action == DuplicateTaskQueued.Ignore)
{
return(false);
}
if (action != DuplicateTaskQueued.Allowed) // wait, or abort running task thread
{
if (action == DuplicateTaskQueued.Abort)
{
AbortTask(task.TaskID);
}
if (action != DuplicateTaskQueued.Wait)
{
WaitForTask(task.TaskID);
}
}
}
queuedTasks.Add(task.TaskID, task);
ThreadWorkerBase wc = task.GetWorkerInstance();
return(ThreadPool.QueueUserWorkItem(new WaitCallback(wc.RunProcess)));
}
