/// <summary>
/// Blocks until all queued work is completed and then returns the results.
/// </summary>
/// <returns>
/// The results of the work that was queued.
/// </returns>
/// <remarks>
/// Calls to this method are serialized.
/// </remarks>
/// <exception cref='ObjectDisposedException'>
/// Is thrown when this operation is performed after <see cref="Dispose"/> has been called.
/// </exception>
public IEnumerable <AsyncWorkResult <T> > GetResults()
{
if (IsDisposed)
{
throw new ObjectDisposedException(null);
}
// lock on the event itself to serialize calls to GetResults().
lock (_getResultsEvent)
{
// Wait for the signal from the work threads.
_getResultsEvent.WaitOne();
// If new work is enqueue between the WaitOne() and here, make sure
// it doesn't try to add to our results while we're copying them out.
lock (_results)
{
// return a copy so no one mutates our internal state.
AsyncWorkResult <T>[] copy = new AsyncWorkResult <T> [_results.Count];
_results.CopyTo(copy);
_results.Clear();
return(copy);
}
}
}
public IEnumerable <AsyncWorkResult <T> > GetResults()
{
AsyncWorkResult <T>[] copy = new AsyncWorkResult <T> [_results.Count];
_results.CopyTo(copy);
_results.Clear();
return(copy);
}
private void ProcessQueue()
{
while (!IsDisposed)
{
Interlocked.Increment(ref _waitingThreads);
try
{
_workSync.WaitOne();
}
finally
{
Interlocked.Decrement(ref _waitingThreads);
}
// Did we wake up because we're being disposed?
if (IsDisposed)
{
break;
}
// Track that we're doing work now.
Interlocked.Increment(ref _runningThreads);
try
{
AsyncWorker <T> work;
lock (_workQueue)
work = _workQueue.Dequeue();
AsyncWorkResult <T> result;
try
{
result = work();
}
catch (Exception error)
{
result = new AsyncWorkResult <T>(error);
}
lock (_results)
_results.Add(result);
}
finally
{
// Done doing work now
Interlocked.Decrement(ref _runningThreads);
}
// is no one working now?
if (_runningThreads == 0)
{
lock (_workQueue)
// is there any work left? (double check no work has started since we
// acquired the lock.)
if (_workQueue.Count == 0 && _runningThreads == 0)
{
// Ok, looks like we're done here. Signal GetResults()
_getResultsEvent.Set();
}
}
}
}
