private AsyncFifoWorker.WorkHandle PostWork(Func <Task> workFunc, bool createTcs, string description, CancellationToken cancellationToken)
{
if (workFunc == null)
{
throw new ArgumentNullException("workFunc");
}
cancellationToken.ThrowIfCancellationRequested();
bool lockTaken = false;
object obj;
AsyncFifoWorker.WorkHandle workHandle;
try
{
Monitor.Enter(obj = this._lock, ref lockTaken);
if (this._isClosed)
{
throw new InvalidOperationException("AsyncFifoWorker is closed");
}
workHandle = new AsyncFifoWorker.WorkHandle(workFunc, createTcs ? new TaskCompletionSource <object>() : (TaskCompletionSource <object>)null);
workHandle.Description = description;
this._workQueue.Enqueue(workHandle);
}
finally
{
if (lockTaken)
{
Monitor.Exit(obj);
}
}
if (!workHandle.Register(new Action <AsyncFifoWorker.WorkHandle>(this.RemoveWork), cancellationToken))
{
Debug.WriteLine("AsyncFifoWorker.PostWork() work already done");
return(workHandle);
}
try
{
this._signalTask.Fire();
}
catch (ObjectDisposedException ex)
{
this.RemoveWork((object)workHandle);
if (this._workQueue.Count > 0)
{
Debug.WriteLine("AsyncFifoWorker.Post() object disposed but there are still {0} pending", (object)this._workQueue.Count);
}
throw;
}
return(workHandle);
}
private async Task Worker()
{
while (true)
{
bool lockTaken = false;
AsyncFifoWorker.WorkHandle work;
object obj;
try
{
Monitor.Enter(obj = this._lock, ref lockTaken);
if (this._workQueue.Count >= 1)
{
work = this._workQueue.Dequeue();
}
else
{
break;
}
}
finally
{
if (lockTaken)
{
Monitor.Exit(obj);
}
}
this._work = work;
try
{
work.TryDeregister();
await work.RunAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
Debug.WriteLine("AsyncFifoWorker.Worker() failed: " + ExceptionExtensions.ExtendedMessage(ex));
}
this._work = (AsyncFifoWorker.WorkHandle)null;
work.Dispose();
}
}
private void RemoveWork(object workObject)
{
AsyncFifoWorker.WorkHandle workHandle = (AsyncFifoWorker.WorkHandle)workObject;
bool lockTaken = false;
object obj;
try
{
Monitor.Enter(obj = this._lock, ref lockTaken);
if (!QueueExtensions.Remove <AsyncFifoWorker.WorkHandle>(this._workQueue, workHandle))
{
return;
}
}
finally
{
if (lockTaken)
{
Monitor.Exit(obj);
}
}
workHandle.Dispose();
}
