static void Main(string[] args)
{
ThreadPoolInformation threadPoolInformation = new ThreadPoolInformation();
GetThreadPoolInformation(threadPoolInformation);
AvailableWorkerThreads = threadPoolInformation.AvailableWorkerThreads;
FindDefaultThreadOnThreadPool();
Console.WriteLine(); Console.WriteLine();
// 複製一份執行前的 ThreadPool 資訊
ThreadPoolInformation threadPoolCurrentInformation = threadPoolInformation.Clone();
ThreadPool.QueueUserWorkItem(x =>
{
while (true)
{
ShowCurrentThreadUsage(threadPoolInformation, threadPoolCurrentInformation);
Thread.Sleep(10);
}
});
Thread.Sleep(500);
WebClient webClient = new WebClient();
webClient.DownloadStringCompleted += (s, e) =>
{
Thread.Sleep(500);
Console.WriteLine(); Console.WriteLine();
Console.WriteLine("已經完成 WebClient 呼叫");
int threadId = Thread.CurrentThread.ManagedThreadId;
if (ThreadsOnThreadPool.ContainsKey(threadId))
{
Console.WriteLine(">>>> 該執行緒為執行緒集區內的 工作執行緒 Worker Thread");
}
else
{
Console.WriteLine("}}}}} 該執行緒為執行緒集區內的 工作執行緒 I/O Thread");
}
//ShowCurrentThreadUsage(threadPoolInformation, threadPoolCurrentInformation);
};
Console.WriteLine("開始使用 WebClient 呼叫 Web API (需時 5 秒)");
webClient.DownloadStringAsync(new Uri(APIEndPoint));
Thread.Sleep(500);
Console.WriteLine(); Console.WriteLine();
Console.WriteLine("等候 WebClient 呼叫完成時候的執行緒集區狀態");
ShowCurrentThreadUsage(threadPoolInformation, threadPoolCurrentInformation);
Console.WriteLine("Press any key for continuing...");
Console.ReadKey();
}
private static void ShowCurrentThreadUsage(ThreadPoolInformation threadPoolInformation, ThreadPoolInformation threadPoolCurrentInformation)
{
int workerThreads;
int completionPortThreads;
// 傳回之執行緒集區的現在還可以容許使用多少的執行緒數量大小
ThreadPool.GetAvailableThreads(out workerThreads, out completionPortThreads);
threadPoolCurrentInformation.AvailableWorkerThreads = workerThreads;
threadPoolCurrentInformation.AvailableCompletionPortThreads = completionPortThreads;
threadPoolCurrentInformation.BusyWorkerThreads = threadPoolInformation.AvailableWorkerThreads - workerThreads;
threadPoolCurrentInformation.BusyCompletionPortThreads = threadPoolInformation.AvailableCompletionPortThreads - completionPortThreads;
ShowAvailableThreadPoolInformation(threadPoolCurrentInformation);
}
// 顯示執行緒集區內上有多少空間，可以用來增加新執行緒的數量
static void ShowAvailableThreadPoolInformation(ThreadPoolInformation threadPoolInformation)
{
if (BusyWorkerThreads != threadPoolInformation.BusyWorkerThreads)
{
Console.WriteLine($" WorkItem Thread :" +
$" (Busy:{threadPoolInformation.BusyWorkerThreads}, Free:{threadPoolInformation.AvailableWorkerThreads}, Min:{threadPoolInformation.MinWorkerThreads}, Max:{threadPoolInformation.MaxWorkerThreads})");
}
if (BusyCompletionPortThreads != threadPoolInformation.BusyCompletionPortThreads)
{
Console.WriteLine($" IOCP Thread :" +
$" (Busy:{threadPoolInformation.BusyCompletionPortThreads}, Free:{threadPoolInformation.AvailableCompletionPortThreads}, Min:{threadPoolInformation.MinCompletionPortThreads}, Max:{threadPoolInformation.MaxCompletionPortThreads})");
}
BusyWorkerThreads = threadPoolInformation.BusyWorkerThreads;
BusyCompletionPortThreads = threadPoolInformation.BusyCompletionPortThreads;
}
// 取得執行緒集區內的相關設定參數
static void GetThreadPoolInformation(ThreadPoolInformation threadPoolInformation)
{
int workerThreads;
int completionPortThreads;
// 傳回之執行緒集區的現在還可以容許使用多少的執行緒數量大小
ThreadPool.GetAvailableThreads(out workerThreads, out completionPortThreads);
threadPoolInformation.AvailableWorkerThreads = workerThreads;
threadPoolInformation.AvailableCompletionPortThreads = completionPortThreads;
// 擷取可並行使用之執行緒集區的要求數目。 超過該數目的所有要求會繼續佇列，直到可以使用執行緒集區執行緒為止
ThreadPool.GetMaxThreads(out workerThreads, out completionPortThreads);
threadPoolInformation.MaxWorkerThreads = workerThreads;
threadPoolInformation.MaxCompletionPortThreads = completionPortThreads;
// 在切換至管理執行緒建立和解構的演算法之前，擷取執行緒集區隨著提出新要求，視需要建立的執行緒最小數目。
ThreadPool.GetMinThreads(out workerThreads, out completionPortThreads);
threadPoolInformation.MinWorkerThreads = workerThreads;
threadPoolInformation.MinCompletionPortThreads = completionPortThreads;
// 如果目前電腦包含多個處理器群組，則這個屬性會傳回可供 Common Language Runtime (CLR) 使用的邏輯處理器數目
threadPoolInformation.ProcessorCount = System.Environment.ProcessorCount;
}
public void ComputeBusyThreads(ThreadPoolInformation threadPoolInformation)
{
this.BusyWorkerThreads = threadPoolInformation.AvailableWorkerThreads - this.AvailableWorkerThreads;
this.BusyCompletionPortThreads = threadPoolInformation.BusyCompletionPortThreads - this.BusyCompletionPortThreads;
}