/// <summary>
/// Signal <see cref="UserUnregisterWaitHandle"/> if it has not been signaled yet and is a valid handle.
/// </summary>
private void SignalUserWaitHandle()
{
_callbackLock.VerifyIsLocked();
SafeWaitHandle handle = UserUnregisterWaitHandle;
IntPtr handleValue = UserUnregisterWaitHandleValue;
try
{
if (handleValue != IntPtr.Zero && handleValue != (IntPtr)(-1))
{
Debug.Assert(handleValue == handle.DangerousGetHandle());
#if PLATFORM_WINDOWS
Interop.Kernel32.SetEvent(handle);
#else
WaitSubsystem.SetEvent(handleValue);
#endif
}
}
finally
{
handle?.DangerousRelease();
_callbacksComplete?.Set();
_unregistered = true;
}
}
//
// This method must only be called if ShouldAdjustMaxWorkersActive has returned true, *and*
// _hillClimbingThreadAdjustmentLock is held.
//
private void AdjustMaxWorkersActive()
{
_hillClimbingThreadAdjustmentLock.VerifyIsLocked();
int currentTicks = Environment.TickCount;
int totalNumCompletions = (int)_completionCounter.Count;
int numCompletions = totalNumCompletions - _separated.priorCompletionCount;
long startTime = _currentSampleStartTime;
long endTime = Stopwatch.GetTimestamp();
long freq = Stopwatch.Frequency;
double elapsedSeconds = (double)(endTime - startTime) / freq;
if (elapsedSeconds * 1000 >= _threadAdjustmentIntervalMs / 2)
{
ThreadCounts currentCounts = ThreadCounts.VolatileReadCounts(ref _separated.counts);
int newMax;
(newMax, _threadAdjustmentIntervalMs) = HillClimbing.ThreadPoolHillClimber.Update(currentCounts.numThreadsGoal, elapsedSeconds, numCompletions);
while (newMax != currentCounts.numThreadsGoal)
{
ThreadCounts newCounts = currentCounts;
newCounts.numThreadsGoal = (short)newMax;
ThreadCounts oldCounts = ThreadCounts.CompareExchangeCounts(ref _separated.counts, newCounts, currentCounts);
if (oldCounts == currentCounts)
{
//
// If we're increasing the max, inject a thread. If that thread finds work, it will inject
// another thread, etc., until nobody finds work or we reach the new maximum.
//
// If we're reducing the max, whichever threads notice this first will sleep and timeout themselves.
//
if (newMax > oldCounts.numThreadsGoal)
{
WorkerThread.MaybeAddWorkingWorker();
}
break;
}
else
{
if (oldCounts.numThreadsGoal > currentCounts.numThreadsGoal && oldCounts.numThreadsGoal >= newMax)
{
// someone (probably the gate thread) increased the thread count more than
// we are about to do. Don't interfere.
break;
}
currentCounts = oldCounts;
}
}
_separated.priorCompletionCount = totalNumCompletions;
_separated.nextCompletedWorkRequestsTime = currentTicks + _threadAdjustmentIntervalMs;
Volatile.Write(ref _separated.priorCompletedWorkRequestsTime, currentTicks);
_currentSampleStartTime = endTime;
}
}
/// <summary>
/// Signal <see cref="UserUnregisterWaitHandle"/> if it has not been signaled yet and is a valid handle.
/// </summary>
private void SignalUserWaitHandle()
{
_callbackLock.VerifyIsLocked();
SafeWaitHandle handle = UserUnregisterWaitHandle;
IntPtr handleValue = UserUnregisterWaitHandleValue;
try
{
if (handleValue != IntPtr.Zero && handleValue != (IntPtr)(-1))
{
EventWaitHandle.Set(handleValue);
}
}
finally
{
handle?.DangerousRelease();
_callbacksComplete?.Set();
_unregistered = true;
}
}
/// <summary>
/// Signal <see cref="UserUnregisterWaitHandle"/> if it has not been signaled yet and is a valid handle.
/// </summary>
private void SignalUserWaitHandle()
{
s_callbackLock.VerifyIsLocked();
SafeWaitHandle?handle = UserUnregisterWaitHandle;
IntPtr handleValue = UserUnregisterWaitHandleValue;
try
{
if (handleValue != IntPtr.Zero && handleValue != InvalidHandleValue)
{
Debug.Assert(handleValue == handle !.DangerousGetHandle());
EventWaitHandle.Set(handle);
}
}
finally
{
handle?.DangerousRelease();
_callbacksComplete?.Set();
_unregistered = true;
}
}
