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RegisterWaitForSingleObject
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RegisterWaitForSingleObject is a shared/static method of the ThreadPool class. It allows a delegate to be associated with a WaitHandlederived object, such as an AutoResetEvent. When the WaitHandle-
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derived object becomes signaled, or a timeout occurs, the passed-in delegate is invoked.
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The last parameter of RegisterWaitForSingleObject controls if the wait occurs only once or if it repeats (figure 10.2). If this value is true, the delegate will wait only once for the WaitHandle-derived object to become signaled. If the parameter is false, the delegate will be invoked repeatedly. The frequency of invocation depends on whether or not a timeout is specified, along with how often the WaitHandle-derived object becomes signaled. One way to understand the RegisterWaitForSingleObject method is to attempt to implement a simplified version of it. The RegisterWaitForSingleObject method in listing 10.3 responds much the same way as the real RegisterWaitForSingleObject method.
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Listing 10.3 A simplified RegisterWaitForSingleObject method (VB.NET)
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Public Class MyWaitForEvent Private Shared MyThread As Thread . . . Public Shared Sub RegisterWaitForSingleObject( _ ByVal EventOfInterest As WaitHandle, _ ByVal WhatToInvoke As WaitOrTimerCallback, _ ByVal state As Object, ByVal Timeout As Integer, _ ByVal OnlyOnce As Boolean) MyStateObject = state MyEventOfInterest = EventOfInterest MyOnlyOnce = OnlyOnce MyWhatToInvoke = WhatToInvoke MyTimeout = Timeout MyThread = New Thread(AddressOf ThreadMethod) MyThread.IsBackground = True MyThread.Name = "MyWaitForEventThread" MyThread.Start() End Sub
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THE THREADPOOL CLASS
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Private Shared Sub ThreadMethod() Dim timedOut As Boolean Do timedOut = Not MyEventOfInterest.WaitOne(MyTimeout, False) MyWhatToInvoke(MyStateObject, timedOut) Loop While Not MyOnlyOnce End Sub . . .
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This method creates a thread that is started when the shared/static method that performs the same function as RegisterWaitForSingleObject is invoked. This simplified version of the method does not execute in a thread pool, but it conveys the key elements of what the ThreadPool method does. RegisterWaitForSingleObject is a powerful way of monitoring a WaitHandle-derived object, such as an AutoResetEvent and invoking a delegate when it becomes signaled.
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INFORMATIONAL METHODS AND PROPERTIES
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One of the most powerful advantages that the .NET framework offers over previous Microsoft development platforms is the amount of diagnostic information available. This section introduces three ThreadPool-related informational methods and properties.
GetMaxThreads and GetAvailableThreads Suppose you wanted to know how many threads the ThreadPool class might use, and how many it was using. This can give insight into the nature of your application. The ThreadPool class does intelligent assignment of tasks to threads. If a large number of threads are being used, the tasks are likely I/O bound. The GetMaxThreads method of the ThreadPool class is used to determine the largest number of threads ThreadPool will use. The GetMaxThreads method returns two out parameters. The first is the maximum number of worker threads the thread pool will use; the second is the maximum number of threads associated with servicing completion ports. Listing 10.4 shows GetMaxThreads and GetAvailableThreads in use.
Listing 10.4 GetMaxThreads and GetAvailableThreads example (C#)
private void timer1_Tick(object sender, System.EventArgs e) { int NumberOfWorkerThreads; int NumberOfCompletionPortThreads; int MaxNumberOfWorkerThreads; int MaxNumberOfCompletionPortThreads; // Return the maximum number of threads that can be // active in the thread pool. ThreadPool.GetMaxThreads( out MaxNumberOfWorkerThreads, out MaxNumberOfCompletionPortThreads);
INFORMATIONAL METHODS AND PROPERTIES
ThreadPool.GetAvailableThreads( The number out NumberOfWorkerThreads, of available out NumberOfCompletionPortThreads); threads label7.Text = NumberOfWorkerThreads.ToString(); label9.Text = MaxNumberOfWorkerThreads.ToString(); label10.Text = MaxNumberOfCompletionPortThreads.ToString(); label12.Text = NumberOfCompletionPortThreads.ToString(); }
The numbers returned by GetMaxThreads indicate the number of threads that can be allocated for ThreadPool. To determine how many threads are available for work in ThreadPool, we use the GetAvailableThreads method. It also returns two values: the number of worker threads available and the number of threads available for servicing completion ports.
GetMaxThreads
GetMaxThreads is a static/shared method of the ThreadPool class that returns the maximum number of worker and completion port threads that will be used.
If the number of available threads is zero, the ThreadPool class must wait until a thread becomes available. During this time any work items added will simply increase the size of the work queue in the ThreadPool object. The number of elements that can be queued is limited only by the amount of available memory.
GetAvailable- GetAvailableThreads returns the number of worker and completion Threads port threads available to service requests.
The number of threads available does not necessarily correlate to the number of threads in the process. Until a thread is needed, it is not created. Once a thread is created it will exist as long as the ThreadPool object feels it is needed. The number of threads in use is a helpful measure. It is determined by subtracting the number of available threads from the maximum number of threads, giving an indication of load. If a task is processor bound, the number of threads in use will likely stay close to the number of processors in the computer. If a task is I/O bound, the number of threads in use will increase, likely to the maximum number of threads allowed. The sleep statement for a thread can be used to simulate an I/O bound task:
object WorkUnit(object param ) { MultParam tmpParm = (MultParam)param; Thread.Sleep(10000); return ClassParaMatrix.MultRowColumn( tmpParm.M1, tmpParm.M2, tmpParm.Column, tmpParm.Row); }
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