Start documenting the threading model

webrtc/modules/pacing/paced_sender.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 121 matching lines @@
   // packets currently in the pacer queue, or 0 if queue is empty.
   virtual int64_t AverageQueueTimeMs();
 
   // Returns the number of milliseconds until the module want a worker thread
   // to call Process.
   int64_t TimeUntilNextProcess() override;
 
   // Process any pending packets in the queue(s).
   void Process() override;
 
+  // Called when the prober is associated with a process thread.
+  void ProcessThreadAttached(ProcessThread* process_thread) override;
+
  private:
   // Updates the number of bytes that can be sent for the next time interval.
   void UpdateBudgetWithElapsedTime(int64_t delta_time_in_ms)
       EXCLUSIVE_LOCKS_REQUIRED(critsect_);
   void UpdateBudgetWithBytesSent(size_t bytes)
       EXCLUSIVE_LOCKS_REQUIRED(critsect_);
 
   bool SendPacket(const paced_sender::Packet& packet,
                   const PacedPacketInfo& cluster_info)
       EXCLUSIVE_LOCKS_REQUIRED(critsect_);
@@ skipping 22 matching lines @@
   // order to meet pace time constraint).
   uint32_t estimated_bitrate_bps_ GUARDED_BY(critsect_);
   uint32_t min_send_bitrate_kbps_ GUARDED_BY(critsect_);
   uint32_t max_padding_bitrate_kbps_ GUARDED_BY(critsect_);
   uint32_t pacing_bitrate_kbps_ GUARDED_BY(critsect_);
 
   int64_t time_last_update_us_ GUARDED_BY(critsect_);
 
   std::unique_ptr<paced_sender::PacketQueue> packets_ GUARDED_BY(critsect_);
   uint64_t packet_counter_;
+  ProcessThread* process_thread_ = nullptr;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_PACING_PACED_SENDER_H_