/// <summary>
/// Returns a string containing the list of active threads and their tasks.
/// It is not recommended to invoke this method very often.
/// </summary>
/// <returns>A string containing the list of active threads and their tasks.</returns>
public static string TakeSnapshot()
{
StringBuilder threadList = new StringBuilder();
lock (_threadsLock)
{
// look for an available worker thread
for (int i = 0; i < _threads.Count; i++)
{
// get the next thread
CustomThreadInfo customThreadInfo = (CustomThreadInfo)_threads[i];
// check if it's alive
if (!customThreadInfo.IsAlive)
{
continue;
}
if (customThreadInfo.IsIdle)
{
continue;
}
threadList.AppendFormat("Thread {0} executes \"{1}\" entry \"{2}\".{3}",
customThreadInfo.Thread.Name, customThreadInfo.WorkCallback.Method.ReflectedType.ToString(),
customThreadInfo.WorkCallback.Method.ToString(), Environment.NewLine);
}
}
return(threadList.ToString());
}
/// <summary>
/// Calculates and returns the number of occupied threads.
/// It is not recommended to invoke this method very often.
/// </summary>
/// <returns>The number of occupied threads.</returns>
public static int CalculateOccupiedThreads()
{
int threadsOccupied = 0;
lock (_threadsLock)
{
// look for an available worker thread
for (int i = 0; i < _threads.Count; i++)
{
CustomThreadInfo customThreadInfo = (CustomThreadInfo)_threads[i];
if (!(customThreadInfo.IsIdle || !customThreadInfo.IsAlive))
{
threadsOccupied++;
}
}
}
return(threadsOccupied);
}
/// <summary>
/// Queues a user work item to the thread pool.
/// </summary>
/// <param name="callback">A WaitCallback representing the method to execute.</param>
/// <param name="state">An object containing data to be used by the method.</param>
/// <param name="longDuration">Indicates whether the item depends on other working threads or can take a long period to finish.</param>
public static void QueueUserWorkItem(WaitCallback callback, object state, bool longDuration)
{
GenuineThreadPoolStrategy theStrategy = GenuineThreadPool.GenuineThreadPoolStrategy;
if (callback == null)
{
throw new NullReferenceException("callback");
}
CustomThreadInfo customThreadInfo = null;
lock (_threadsLock)
{
BinaryLogWriter binaryLogWriter = GenuineLoggingServices.BinaryLogWriter;
if (binaryLogWriter != null && binaryLogWriter[LogCategory.StatisticCounters] > 0 && (Interlocked.Increment(ref _QueueUserWorkItem_OperationNumber) % GenuineThreadPool.ThreadStatisticFrequency) == 0)
{
binaryLogWriter.WriteEvent(LogCategory.StatisticCounters, "GenuineThreadPool.QueueUserWorkItem",
LogMessageType.ThreadPoolUsage, null, null, null, null,
GenuineUtility.CurrentThreadId, Thread.CurrentThread.Name,
null, null,
-1, _QueueUserWorkItem_OperationNumber, GenuineThreadPool._threads.Count, 0, null, null, null, null,
"GenuineThreadPool has received a request #{0} (object \"{1}\" entry \"{2}\"). The current number of working threads: {3}. ThreadPoolAvailableThreads: {4}. MaximumThreads: {5}. CloseAfterInactivity: {6}. UnsafeQueuing: {7}. GenuineThreadPoolStrategy: {8}.",
_QueueUserWorkItem_OperationNumber, callback.Method.ReflectedType.ToString(),
callback.Method.ToString(),
GenuineThreadPool._threads.Count,
GenuineThreadPool.ThreadPoolAvailableThreads, GenuineThreadPool.MaximumThreads,
GenuineThreadPool.CloseAfterInactivity.TotalMilliseconds, GenuineThreadPool.UnsafeQueuing,
Enum.Format(typeof(GenuineThreadPoolStrategy), GenuineThreadPool.GenuineThreadPoolStrategy, "g")
);
}
if (!(theStrategy == GenuineThreadPoolStrategy.AlwaysThreads ||
(theStrategy == GenuineThreadPoolStrategy.OnlyLongDuration && longDuration)))
{
// try to use native ThreadPool if it's possible
int workerThreads = 0;
int completionPortThreads = 0;
if (theStrategy == GenuineThreadPoolStrategy.SwitchAfterExhaustion)
{
ThreadPool.GetAvailableThreads(out workerThreads, out completionPortThreads);
}
if (theStrategy == GenuineThreadPoolStrategy.AlwaysNative ||
theStrategy == GenuineThreadPoolStrategy.OnlyLongDuration ||
(Math.Min(workerThreads, completionPortThreads) >= GenuineThreadPool.ThreadPoolAvailableThreads && theStrategy == GenuineThreadPoolStrategy.SwitchAfterExhaustion))
{
if (GenuineThreadPool.UnsafeQueuing)
{
ThreadPool.UnsafeQueueUserWorkItem(callback, state);
}
else
{
ThreadPool.QueueUserWorkItem(callback, state);
}
return;
}
}
// look for an available worker thread
for (int i = 0; i < _threads.Count;)
{
// get the next thread
customThreadInfo = (CustomThreadInfo)_threads[i];
// check if it's alive
if (!customThreadInfo.IsAlive)
{
_threads.RemoveAt(i);
customThreadInfo = null;
continue;
}
if (customThreadInfo.IsIdle)
{
break;
}
customThreadInfo = null;
i++;
}
// if the limit is exceeded
if (customThreadInfo == null && _threads.Count >= GenuineThreadPool.MaximumThreads)
{
if (GenuineThreadPool.AllowRequestQueuing)
{
_requestsQueued.Enqueue(new GenuineThreadPoolWorkItem(callback, state));
return;
}
else
{
throw GenuineExceptions.Get_Processing_ThreadPoolLimitExceeded();
}
}
// create a new one, if it's necessary
if (customThreadInfo == null)
{
customThreadInfo = new CustomThreadInfo(_threadsLock);
_threads.Add(customThreadInfo);
}
// give out the work
customThreadInfo.WorkCallback = callback;
customThreadInfo.CallbackState = state;
customThreadInfo.IsIdle = false;
customThreadInfo.ManualResetEvent.Set();
}
}
