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POClose foreground thread gracefully on windows service stop
 

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    <p>In my windows service I create one "parent" foreground thread that in turn spawns "child" threads using ThreadPool (which means they are background) to execute tasks.</p> <p>What is the best way to close foreground thread gracefully on windows service stop?</p> <p>Here is my current implementation (stripped out of task-specific logic):</p> <pre><code>public partial class TaskScheduler : ServiceBase { private static AutoResetEvent _finishedTaskAutoResetEvent = new AutoResetEvent(false); //This flag is used to increase chances of the Spawning Thread to finish gracefully when service stops. private bool StopRequested { get; set; } private int _executingTasksCount; private int ExecutingTasksCount { get { return _executingTasksCount; } } private void IncCurrentTasksCount() { Interlocked.Increment(ref _executingTasksCount); } private void DecCurrentTasksCount() { Interlocked.Decrement(ref _executingTasksCount); } public TaskScheduler() { InitializeComponent(); Thread spawningThread = new Thread(DoSpawnTaskExecutionThreads); spawningThread.Name = "Spawning Thread"; spawningThread.IsBackground = false; spawningThread.Start(); } protected override void OnStart(string[] args) { } protected override void OnStop() { StopRequested = true; } private void DoSpawnTaskExecutionThreads() { //We check StopRequested to try and finish this thread gracefully when service stops. while (!StopRequested) { while (!StopRequested &amp;&amp; ExecutingTasksCount &lt; MaxPooledTasks) { ThreadPool.QueueUserWorkItem(ExecuteTask, new Task()); IncCurrentTasksCount(); } _finishedTaskAutoResetEvent.WaitOne(); } //Either all task execution threads will finish or the process will be terminated forcibly. while (ExecutingTasksCount &gt; 0) { Thread.Sleep(200); //Check five times a second. } _eventLog.WriteEntry("The Spawning Thread finished along with task execution threads."); } private void ExecuteTask(object state) { try { Task task = (Task)state; task.Execute(); } catch { // Handle exception. } finally { DecCurrentTasksCount(); _finishedTaskAutoResetEvent.Set(); } } </code></pre> <p>}</p>
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