protected virtual void Dispose(bool disposing)
{
if (this.disposed)
{
return;
}
if (disposing)
{
lock (this.syncObj)
{
while (this.pending.Count > 0)
{
AsyncResultWaiter <int> asyncResultWaiter = this.pending.Dequeue();
if (!asyncResultWaiter.StillPending)
{
continue;
}
this.pendingWaitersToExpire.Remove(asyncResultWaiter);
ThreadPool.QueueUserWorkItem((object o) => ((AsyncResult <int>)o).Complete(new TimeoutException("The asynchronous semaphore was disposed."), false), asyncResultWaiter.AsyncResult);
}
if (this.timer != null)
{
this.timer.Dispose();
this.timer = null;
}
}
}
this.disposed = true;
}
private void TimeoutExpiredWaiters(object state)
{
DateTime dateTime = DateTime.UtcNow.Add(AsyncSemaphore.FutureExpiryThreshold);
List <AsyncResultWaiter <int> > asyncResultWaiters = new List <AsyncResultWaiter <int> >(1);
lock (this.syncObj)
{
while (this.pendingWaitersToExpire.Count > 0)
{
AsyncResultWaiter <int> asyncResultWaiter = this.First <AsyncResultWaiter <int> >(this.pendingWaitersToExpire.Keys);
if (asyncResultWaiter.ExpiryTime >= dateTime)
{
TimeSpan zero = asyncResultWaiter.ExpiryTime.Subtract(DateTime.UtcNow);
if (zero < TimeSpan.Zero)
{
zero = TimeSpan.Zero;
}
this.timer.Change(zero, TimeSpan.FromMilliseconds(-1));
break;
}
else
{
asyncResultWaiters.Add(asyncResultWaiter);
this.pendingWaitersToExpire.Remove(asyncResultWaiter);
asyncResultWaiter.StillPending = false;
this.numExpiredWaitersInQueue++;
}
}
}
foreach (AsyncResultWaiter <int> asyncResultWaiter1 in asyncResultWaiters)
{
ThreadPool.QueueUserWorkItem((object delegateState) => ((AsyncResult <int>)delegateState).Complete(new TimeoutException("The resource(s) could not be acquired within the specified timeout period."), false), asyncResultWaiter1.AsyncResult);
}
}
protected void TimeoutExpiredWaiters(object state_ignored)
{
DateTime dateTime = DateTime.UtcNow.Add(AsyncSignal <SignalDataType> .FutureExpiryThreshold);
List <AsyncResultWaiter <SignalDataType> > asyncResultWaiters = new List <AsyncResultWaiter <SignalDataType> >(1);
lock (this.syncObj)
{
while (this.waiters.Count > 0)
{
AsyncResultWaiter <SignalDataType> item = this.waiters.Keys[0];
if (item.ExpiryTime >= dateTime)
{
TimeSpan zero = item.ExpiryTime.Subtract(DateTime.UtcNow);
if (zero < TimeSpan.Zero)
{
zero = TimeSpan.Zero;
}
this.timer.Change(zero, TimeSpan.FromMilliseconds(-1));
break;
}
else
{
asyncResultWaiters.Add(item);
this.waiters.RemoveAt(0);
}
}
}
foreach (AsyncResultWaiter <SignalDataType> asyncResultWaiter in asyncResultWaiters)
{
ThreadPool.QueueUserWorkItem((object state) => ((AsyncResult <SignalDataType>)state).Complete(new TimeoutException("The asynchronous signal was not set within the specified timeout period."), false), asyncResultWaiter.AsyncResult);
}
}
public int Compare(AsyncResultWaiter <T> x, AsyncResultWaiter <T> y)
{
int num = x.ExpiryTime.CompareTo(y.ExpiryTime);
if (num == 0)
{
num = x.WaiterIndex.CompareTo(y.WaiterIndex);
}
return(num);
}
private void CleanupExpiredWaiters(object syncObj)
{
Queue <AsyncResultWaiter <int> > asyncResultWaiters = new Queue <AsyncResultWaiter <int> >();
while (this.pending.Count > 0)
{
AsyncResultWaiter <int> asyncResultWaiter = this.pending.Dequeue();
if (!asyncResultWaiter.StillPending)
{
continue;
}
asyncResultWaiters.Enqueue(asyncResultWaiter);
}
this.pending = asyncResultWaiters;
this.numExpiredWaitersInQueue = 0;
}
public void Release(int releaseCount)
{
this.CheckDisposed();
if (releaseCount < 1)
{
throw new ArgumentOutOfRangeException("releaseCount", (object)releaseCount, "releaseCount must be >= 1");
}
lock (this.syncObj)
{
if (releaseCount > this.maxCount - this.count)
{
throw new SemaphoreFullException();
}
this.count += releaseCount;
while (this.pending.Count > 0)
{
AsyncResultWaiter <int> asyncResultWaiter = this.pending.Peek();
if (asyncResultWaiter.StillPending)
{
if (asyncResultWaiter.AsyncResult.ResultData > this.count)
{
break;
}
this.pending.Dequeue();
this.count -= asyncResultWaiter.AsyncResult.ResultData;
if (asyncResultWaiter.ExpiryTime != DateTime.MaxValue)
{
this.pendingWaitersToExpire.Remove(asyncResultWaiter);
}
ThreadPool.QueueUserWorkItem((object o) => ((AsyncResult <int>)o).Complete(null, false), asyncResultWaiter.AsyncResult);
}
else
{
this.pending.Dequeue();
this.numExpiredWaitersInQueue--;
}
}
}
}
public IAsyncResult BeginAcquire(int acquireCount, TimeSpan timeout, AsyncCallback callback, object state)
{
IAsyncResult asyncResult;
this.CheckDisposed();
if (acquireCount <= 0 || acquireCount > this.maxCount)
{
throw new ArgumentOutOfRangeException("acquireCount", (object)acquireCount, "acquireCount must be > 0 and <= MaxCount");
}
if (timeout < TimeSpan.Zero)
{
throw new ArgumentOutOfRangeException("timeout", (object)timeout, "must be >= 0");
}
AsyncResult <int> asyncResult1 = new AsyncResult <int>("AsyncSemaphore.Acquire", callback, state)
{
ResultData = acquireCount
};
if (timeout == TimeSpan.Zero)
{
asyncResult1.Complete(new TimeoutException("The resource(s) could not be acquired within the specified timeout period."), true);
return(asyncResult1);
}
DateTime dateTime = (timeout == TimeSpan.MaxValue ? DateTime.MaxValue : DateTime.UtcNow.Add(timeout));
lock (this.syncObj)
{
if (acquireCount > this.count || this.pending.Count > 0)
{
if (this.maxPending.HasValue && this.pending.Count == this.maxPending.Value)
{
if (this.numExpiredWaitersInQueue <= 0)
{
asyncResult1.Complete(new SemaphoreQueueExhaustedException("Too many pending waiters"), true);
asyncResult = asyncResult1;
return(asyncResult);
}
else
{
this.CleanupExpiredWaiters(this.syncObj);
}
}
AsyncSemaphore asyncSemaphore = this;
int num = asyncSemaphore.waiterIndex;
int num1 = num;
asyncSemaphore.waiterIndex = num + 1;
AsyncResultWaiter <int> asyncResultWaiter = new AsyncResultWaiter <int>(asyncResult1, dateTime, num1);
this.pending.Enqueue(asyncResultWaiter);
if (timeout != TimeSpan.MaxValue)
{
this.pendingWaitersToExpire.Add(asyncResultWaiter, new NoResults());
if (this.timer == null)
{
this.timer = new Timer(new TimerCallback(this.TimeoutExpiredWaiters), null, timeout, TimeSpan.FromMilliseconds(-1));
}
else if (asyncResultWaiter.AsyncResult == this.First <AsyncResultWaiter <int> >(this.pendingWaitersToExpire.Keys).AsyncResult)
{
this.timer.Change(timeout, TimeSpan.FromMilliseconds(-1));
}
}
}
else
{
this.count -= acquireCount;
asyncResult1.Complete(null, true);
}
return(asyncResult1);
}
return(asyncResult);
}
