Ionic.Zlib.ParallelDeflateOutputStream.EmitPendingBuffers C# (CSharp) Method

        private void EmitPendingBuffers(bool doAll, bool mustWait)
        {
            // When combining parallel deflation with a ZipSegmentedStream, it's
            // possible for the ZSS to throw from within this method.  In that
            // case, Close/Dispose will be called on this stream, if this stream
            // is employed within a using or try/finally pair as required. But
            // this stream is unaware of the pending exception, so the Close()
            // method invokes this method AGAIN.  This can lead to a deadlock.
            // Therefore, failfast if re-entering.

            if (emitting) return;
            emitting = true;
            if ((doAll && (_latestCompressed != _lastFilled)) || mustWait) {
                _newlyCompressedBlob.WaitOne();
            }

            do
            {
                int firstSkip = -1;
                int millisecondsToWait = doAll ? 200 : (mustWait ? -1 : 0);
                int nextToWrite = -1;

                do
                {
                    if (Monitor.TryEnter(_toWrite, millisecondsToWait))
                    {
                        nextToWrite = -1;
                        try
                        {
                            if (_toWrite.Count > 0)
                                nextToWrite = _toWrite.Dequeue();
                        }
                        finally
                        {
                            Monitor.Exit(_toWrite);
                        }

                        if (nextToWrite >= 0)
                        {
                            WorkItem workitem = _pool[nextToWrite];
                            if (workitem.ordinal != _lastWritten + 1)
                            {
                                // out of order. requeue and try again.
                                TraceOutput(TraceBits.EmitSkip,
                                            "Emit     skip     wi({0}) ord({1}) lw({2}) fs({3})",
                                            workitem.index,
                                            workitem.ordinal,
                                            _lastWritten,
                                            firstSkip);

                                lock(_toWrite)
                                {
                                    _toWrite.Enqueue(nextToWrite);
                                }

                                if (firstSkip == nextToWrite)
                                {
                                    // We went around the list once.
                                    // None of the items in the list is the one we want.
                                    // Now wait for a compressor to signal again.
                                    _newlyCompressedBlob.WaitOne();
                                    firstSkip = -1;
                                }
                                else if (firstSkip == -1)
                                    firstSkip = nextToWrite;

                                continue;
                            }

                            firstSkip = -1;

                            TraceOutput(TraceBits.EmitBegin,
                                        "Emit     begin    wi({0}) ord({1})              cba({2})",
                                        workitem.index,
                                        workitem.ordinal,
                                        workitem.compressedBytesAvailable);

                            _outStream.Write(workitem.compressed, 0, workitem.compressedBytesAvailable);
                            _runningCrc.Combine(workitem.crc, workitem.inputBytesAvailable);
                            _totalBytesProcessed += workitem.inputBytesAvailable;
                            workitem.inputBytesAvailable = 0;

                            TraceOutput(TraceBits.EmitDone,
                                        "Emit     done     wi({0}) ord({1})              cba({2}) mtw({3})",
                                        workitem.index,
                                        workitem.ordinal,
                                        workitem.compressedBytesAvailable,
                                        millisecondsToWait);

                            _lastWritten = workitem.ordinal;
                            _toFill.Enqueue(workitem.index);

                            // don't wait next time through
                            if (millisecondsToWait == -1) millisecondsToWait = 0;
                        }
                    }
                    else
                        nextToWrite = -1;

                } while (nextToWrite >= 0);

            } while (doAll && (_lastWritten != _latestCompressed || _lastWritten != _lastFilled));

            emitting = false;
        }