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diff --git a/src/cpp/stream/stream_context.h b/src/cpp/stream/stream_context.h
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+++ b/src/cpp/stream/stream_context.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
+#define __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__
+
+#include <condition_variable>
+#include <mutex>
+#include <thread>
+
+#include <grpc++/status.h>
+#include <grpc++/stream_context_interface.h>
+
+namespace google {
+namespace protobuf {
+class Message;
+}
+}
+
+struct grpc_event;
+
+namespace grpc {
+class ClientContext;
+class RpcMethod;
+
+class StreamContext : public StreamContextInterface {
+ public:
+  StreamContext(const RpcMethod& method, ClientContext* context,
+                const google::protobuf::Message* request, google::protobuf::Message* result);
+  ~StreamContext();
+  // Start the stream, if there is a final write following immediately, set
+  // buffered so that the messages can be sent in batch.
+  void Start(bool buffered) override;
+  bool Read(google::protobuf::Message* msg) override;
+  bool Write(const google::protobuf::Message* msg, bool is_last) override;
+  const Status& Wait() override;
+  void FinishStream(const Status& status, bool send) override;
+
+  const google::protobuf::Message* request() override { return request_; }
+  google::protobuf::Message* response() override { return result_; }
+
+ private:
+  void PollingLoop();
+  bool BlockingStart();
+  bool is_client_;
+  const RpcMethod* method_;         // not owned
+  ClientContext* context_;          // now owned
+  const google::protobuf::Message* request_;  // not owned
+  google::protobuf::Message* result_;         // not owned
+
+  std::thread cq_poller_;
+  std::mutex mu_;
+  std::condition_variable invoke_cv_;
+  std::condition_variable read_cv_;
+  std::condition_variable write_cv_;
+  std::condition_variable finish_cv_;
+  grpc_event* invoke_ev_;
+  // TODO(yangg) make these two into queues to support concurrent reads and
+  // writes
+  grpc_event* read_ev_;
+  grpc_event* write_ev_;
+  bool reading_;
+  bool writing_;
+  bool got_read_;
+  bool got_write_;
+  bool peer_halfclosed_;
+  bool self_halfclosed_;
+  bool stream_finished_;
+  bool waiting_;
+  Status final_status_;
+};
+
+}  // namespace grpc
+
+#endif  // __GRPCPP_INTERNAL_STREAM_STREAM_CONTEXT_H__