protected override void Dispose(bool disposing)
{
// Unadvise solution listeners.
try
{
if (disposing)
{
// only decrement the reference count once, regardless of the number of times Dispose is called.
// Ignore if Initialize was never called.
if (_initialized && !_disposed && Interlocked.Decrement(ref _singleFileGeneratorNodeExtenderReferenceCount) == 0)
{
ObjectExtenders objectExtenders = (ObjectExtenders)GetService(typeof(ObjectExtenders));
objectExtenders.UnregisterExtenderProvider(_singleFileGeneratorNodeExtenderCookie);
}
foreach (SolutionListener solutionListener in this.solutionListeners)
{
solutionListener.Dispose();
}
}
}
finally
{
_disposed = true;
base.Dispose(disposing);
}
}
/// <summary>
/// Executes a foreach loop in which iterations may run in parallel
/// </summary>
/// <typeparam name="T">Object type that the collection wraps</typeparam>
/// <param name="threadCount">The number of concurrent execution threads to run</param>
/// <param name="enumerable">An enumerable collection to iterate over</param>
/// <param name="body">Method body to run for each object in the collection</param>
public static void ForEach <T>(int threadCount, IEnumerable <T> enumerable, Action <T> body)
{
int counter = threadCount;
AutoResetEvent threadFinishEvent = new AutoResetEvent(false);
IEnumerator <T> enumerator = enumerable.GetEnumerator();
Exception exception = null;
for (int i = 0; i < threadCount; i++)
{
ThreadPool.QueueUserWorkItem(
delegate(object o)
{
int threadIndex = (int)o;
while (exception == null)
{
T entry;
lock (enumerator)
{
if (!enumerator.MoveNext())
{
break;
}
entry = (T)enumerator.Current; // Explicit typecast for Mono's sake
}
try { body(entry); }
catch (Exception ex) { exception = ex; break; }
}
if (Interlocked.Decrement(ref counter) == 0)
{
threadFinishEvent.Set();
}
}, i
);
}
threadFinishEvent.WaitOne();
if (exception != null)
{
throw exception;
}
}
public override AbstractEdgeMap <T> Put(int key, T value)
{
if (key >= minIndex && key <= maxIndex)
{
T existing = Interlocked.Exchange(ref arrayData[key - minIndex], value);
if (existing == null && value != null)
{
Interlocked.Increment(ref size);
}
else
{
if (existing != null && value == null)
{
Interlocked.Decrement(ref size);
}
}
}
return(this);
}
/// <summary>
/// Executes a for loop in which iterations may run in parallel
/// </summary>
/// <param name="threadCount">The number of concurrent execution threads to run</param>
/// <param name="fromInclusive">The loop will be started at this index</param>
/// <param name="toExclusive">The loop will be terminated before this index is reached</param>
/// <param name="body">Method body to run for each iteration of the loop</param>
public static void For(int threadCount, int fromInclusive, int toExclusive, Action <int> body)
{
int counter = threadCount;
AutoResetEvent threadFinishEvent = new AutoResetEvent(false);
Exception exception = null;
--fromInclusive;
for (int i = 0; i < threadCount; i++)
{
ThreadPool.QueueUserWorkItem(
delegate(object o)
{
int threadIndex = (int)o;
while (exception == null)
{
int currentIndex = Interlocked.Increment(ref fromInclusive);
if (currentIndex >= toExclusive)
{
break;
}
try { body(currentIndex); }
catch (Exception ex) { exception = ex; break; }
}
if (Interlocked.Decrement(ref counter) == 0)
{
threadFinishEvent.Set();
}
}, i
);
}
threadFinishEvent.WaitOne();
if (exception != null)
{
throw exception;
}
}
/// <summary>
/// Executes a series of tasks in parallel
/// </summary>
/// <param name="threadCount">The number of concurrent execution threads to run</param>
/// <param name="actions">A series of method bodies to execute</param>
public static void Invoke(int threadCount, params Action[] actions)
{
int counter = threadCount;
AutoResetEvent threadFinishEvent = new AutoResetEvent(false);
int index = -1;
Exception exception = null;
for (int i = 0; i < threadCount; i++)
{
ThreadPool.QueueUserWorkItem(
delegate(object o)
{
int threadIndex = (int)o;
while (exception == null)
{
int currentIndex = Interlocked.Increment(ref index);
if (currentIndex >= actions.Length)
{
break;
}
try { actions[currentIndex](); }
catch (Exception ex) { exception = ex; break; }
}
if (Interlocked.Decrement(ref counter) == 0)
{
threadFinishEvent.Set();
}
}, i
);
}
threadFinishEvent.WaitOne();
if (exception != null)
{
throw exception;
}
}
internal void Exit()
{
var op = this.Resource.Runtime.GetExecutingOperation <AsyncOperation>();
this.Resource.Runtime.Assert(this.LockCountMap.ContainsKey(op), "Cannot invoke Dispose without acquiring the lock.");
this.LockCountMap[op]--;
if (this.LockCountMap[op] is 0)
{
// Only release the lock if the invocation is not reentrant.
this.LockCountMap.Remove(op);
this.UnlockNextReady();
this.Resource.Runtime.ScheduleNextOperation(AsyncOperationType.Release);
}
int useCount = SystemInterlocked.Decrement(ref this.UseCount);
if (useCount is 0 && Cache[this.SyncObject].Value == this)
{
// It is safe to remove this instance from the cache.
Cache.TryRemove(this.SyncObject, out _);
}
}
public void Exit()
{
Interlocked.Decrement(ref m_owner);
}
private static void GateThreadStart()
{
bool disableStarvationDetection =
AppContextConfigHelper.GetBooleanConfig("System.Threading.ThreadPool.DisableStarvationDetection", false);
bool debuggerBreakOnWorkStarvation =
AppContextConfigHelper.GetBooleanConfig("System.Threading.ThreadPool.DebugBreakOnWorkerStarvation", false);
// The first reading is over a time range other than what we are focusing on, so we do not use the read other
// than to send it to any runtime-specific implementation that may also use the CPU utilization.
CpuUtilizationReader cpuUtilizationReader = default;
_ = cpuUtilizationReader.CurrentUtilization;
PortableThreadPool threadPoolInstance = ThreadPoolInstance;
LowLevelLock threadAdjustmentLock = threadPoolInstance._threadAdjustmentLock;
DelayHelper delayHelper = default;
if (BlockingConfig.IsCooperativeBlockingEnabled)
{
// Initialize memory usage and limits, and register to update them on gen 2 GCs
threadPoolInstance.OnGen2GCCallback();
Gen2GcCallback.Register(threadPoolInstance.OnGen2GCCallback);
}
while (true)
{
RunGateThreadEvent.WaitOne();
int currentTimeMs = Environment.TickCount;
delayHelper.SetGateActivitiesTime(currentTimeMs);
while (true)
{
bool wasSignaledToWake = DelayEvent.WaitOne((int)delayHelper.GetNextDelay(currentTimeMs));
currentTimeMs = Environment.TickCount;
// Thread count adjustment for cooperative blocking
do
{
PendingBlockingAdjustment pendingBlockingAdjustment = threadPoolInstance._pendingBlockingAdjustment;
if (pendingBlockingAdjustment == PendingBlockingAdjustment.None)
{
delayHelper.ClearBlockingAdjustmentDelay();
break;
}
bool previousDelayElapsed = false;
if (delayHelper.HasBlockingAdjustmentDelay)
{
previousDelayElapsed =
delayHelper.HasBlockingAdjustmentDelayElapsed(currentTimeMs, wasSignaledToWake);
if (pendingBlockingAdjustment == PendingBlockingAdjustment.WithDelayIfNecessary &&
!previousDelayElapsed)
{
break;
}
}
uint nextDelayMs = threadPoolInstance.PerformBlockingAdjustment(previousDelayElapsed);
if (nextDelayMs <= 0)
{
delayHelper.ClearBlockingAdjustmentDelay();
}
else
{
delayHelper.SetBlockingAdjustmentTimeAndDelay(currentTimeMs, nextDelayMs);
}
} while (false);
//
// Periodic gate activities
//
if (!delayHelper.ShouldPerformGateActivities(currentTimeMs, wasSignaledToWake))
{
continue;
}
if (ThreadPool.EnableWorkerTracking && NativeRuntimeEventSource.Log.IsEnabled())
{
NativeRuntimeEventSource.Log.ThreadPoolWorkingThreadCount(
(uint)threadPoolInstance.GetAndResetHighWatermarkCountOfThreadsProcessingUserCallbacks());
}
int cpuUtilization = cpuUtilizationReader.CurrentUtilization;
threadPoolInstance._cpuUtilization = cpuUtilization;
bool needGateThreadForRuntime = ThreadPool.PerformRuntimeSpecificGateActivities(cpuUtilization);
if (!disableStarvationDetection &&
threadPoolInstance._pendingBlockingAdjustment == PendingBlockingAdjustment.None &&
threadPoolInstance._separated.numRequestedWorkers > 0 &&
SufficientDelaySinceLastDequeue(threadPoolInstance))
{
bool addWorker = false;
threadAdjustmentLock.Acquire();
try
{
// Don't add a thread if we're at max or if we are already in the process of adding threads.
// This logic is slightly different from the native implementation in CoreCLR because there are
// no retired threads. In the native implementation, when hill climbing reduces the thread count
// goal, threads that are stopped from processing work are switched to "retired" state, and they
// don't count towards the equivalent existing thread count. In this implementation, the
// existing thread count includes any worker thread that has not yet exited, including those
// stopped from working by hill climbing, so here the number of threads processing work, instead
// of the number of existing threads, is compared with the goal. There may be alternative
// solutions, for now this is only to maintain consistency in behavior.
ThreadCounts counts = threadPoolInstance._separated.counts;
while (
counts.NumProcessingWork < threadPoolInstance._maxThreads &&
counts.NumProcessingWork >= counts.NumThreadsGoal)
{
if (debuggerBreakOnWorkStarvation)
{
Debugger.Break();
}
ThreadCounts newCounts = counts;
short newNumThreadsGoal = (short)(counts.NumProcessingWork + 1);
newCounts.NumThreadsGoal = newNumThreadsGoal;
ThreadCounts countsBeforeUpdate =
threadPoolInstance._separated.counts.InterlockedCompareExchange(newCounts, counts);
if (countsBeforeUpdate == counts)
{
HillClimbing.ThreadPoolHillClimber.ForceChange(
newNumThreadsGoal,
HillClimbing.StateOrTransition.Starvation);
addWorker = true;
break;
}
counts = countsBeforeUpdate;
}
}
finally
{
threadAdjustmentLock.Release();
}
if (addWorker)
{
WorkerThread.MaybeAddWorkingWorker(threadPoolInstance);
}
}
if (!needGateThreadForRuntime &&
threadPoolInstance._separated.numRequestedWorkers <= 0 &&
threadPoolInstance._pendingBlockingAdjustment == PendingBlockingAdjustment.None &&
Interlocked.Decrement(ref threadPoolInstance._separated.gateThreadRunningState) <= GetRunningStateForNumRuns(0))
{
break;
}
}
}
}
