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ConsoleWriteLine( "(Alarm Thread Id) {0} != {1} (Main Thread Id)", _AlarmThreadId, ThreadCurrentThreadManagedThreadId); ConsoleWriteLine("Final Count = {0}", _Count); } static void Alarm(object state) { _Count++; ConsoleWriteLine("{0}:- {1}",
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_Count); if (_Count >= 9) { _AlarmThreadId = ThreadCurrentThreadManagedThreadId; _ResetEventSet(); } } }
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OUTPUT 1813:
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12:19:36 AM:12:19:37 AM:12:19:38 AM:12:19:39 AM:12:19:40 AM:12:19:41 AM:12:19:42 AM:12:19:43 AM:12:19:44 AM:(Alarm Thread Final Count = 1 2 3 4 5 6 7 8 9 Id) 4 != 1 (Main Thread Id) 9
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You can change the interval or time due after instantiation on SystemThreadingTimer via the Change() method However, you cannot change the callback listeners after instantiation Instead, you must create a new instance
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18: Multithreading
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This chapter delved into the details surrounding the creation and manipulation of threads In addition to introducing the framework-related classes and the lock keyword, this chapter gave an overview of what makes multithreaded programming difficult In summary, the difficulty concerns not the APIs themselves, but rather the uncertainty that multithreaded programming can introduce unless appropriate synchronization is in place The next chapter takes multithreaded programming in the framework a little further by explaining how to place common multithreading scenarios within a pattern so you do not need to reinvent the design for solving the scenarios
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18 FOCUSED on managing threads and synchronizing the data the threads share As developers write more multithreaded code, a common set of scenarios and programming patterns for handling those scenarios emerges The key scenarios relate to notifications of when a thread completes and notifications about the progress on the threads status In addition, there is some built-in C# functionality for calling methods asynchronously, regardless of whether their signatures match ThreadStart Most importantly, going with built-in patterns like this significantly reduces the effort in programming to solve these types of scenarios from scratch
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Asynchronous Introduction Results Pattern Passing Data
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19: Multithreading Patterns
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The two patterns specifically designed for these scenarios are the asynchronous results pattern and the background worker pattern, and this chapter investigates both This chapter breaks down how to code these patterns into a step-by-step process, and points out some important characteristics of Windows Forms programming
Asynchronous Results Pattern
Multithreaded programming includes the following complexities 1 Monitoring the thread state for completion: This includes determining when a thread has completed, preferably not by polling the thread s state or by blocking and waiting with a call to Join() 2 Passing data to and from the thread: Calling arbitrary methods asynchronously is cumbersome because they do not necessarily support ThreadState- or ParameterizedThreadStart-compatible signatures 3 Thread pooling: This avoids the significant cost of starting and tearing down threads In addition, thread pooling avoids the creation of too many threads, such that the system spends more time switching threads than running them 4 Providing atomicity across operations and synchronizing data access: Adding synchronization around groups of operations ensures that operations execute as a single unit and that they are appropriately interrupted by another thread Locking is provided so two different threads do not access the data simultaneously 5 Avoiding deadlocks: This involves preventing the occurrence of deadlocks while attempting to protect the data from simultaneous access by two different threads To deal with this complexity, C# includes the asynchronous results pattern This section demonstrates how to use the asynchronous results pattern and shows how it simplifies at least the first three complexities associated with multithreading
Asynchronous Results Pattern
Introducing the Asynchronous Results Pattern With the asynchronous results pattern, you do not code using the Thread class explicitly Instead, you use delegate instances Consider the code in Listing 191
Listing 191: Asynchronous Results Pattern Example
using System; using SystemThreading; public class AsyncResultPatternIntroduction { delegate void WorkerThreadHandler(); public static AutoResetEvent ResetEvent = new AutoResetEvent(false); public static void Main() { ConsoleWriteLine("Application started"); WorkerThreadHandler workerMethod = null; IAsyncResult asyncResult = null; try { workerMethod = new WorkerThreadHandler(DoWork); ConsoleWriteLine("Starting thread"); asyncResult = workerMethodBeginInvoke(null, null); // Display periods as progress bar while(!asyncResultAsyncWaitHandleWaitOne( 1000, false)) { ConsoleWrite(''); } ConsoleWriteLine(); ConsoleWriteLine("Thread ending"); } finally { if (workerMethod != null && asyncResult != null) { workerMethodEndInvoke(asyncResult); } } ConsoleWriteLine("Application shutting down");