Deciding best connection to schedule requests on based on cwnd and idle time

net/socket/tcp_client_socket_libevent.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_
 #define NET_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/threading/non_thread_safe.h"
+#include "base/time.h"
 #include "net/base/address_list.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_log.h"
 #include "net/socket/stream_socket.h"
 
 struct event;  // From libevent
 
 namespace net {
 
 class BoundNetLog;
@@ skipping 23 matching lines @@
   virtual bool IsConnected() const;
   virtual bool IsConnectedAndIdle() const;
   virtual int GetPeerAddress(AddressList* address) const;
   virtual int GetLocalAddress(IPEndPoint* address) const;
   virtual const BoundNetLog& NetLog() const;
   virtual void SetSubresourceSpeculation();
   virtual void SetOmniboxSpeculation();
   virtual bool WasEverUsed() const;
   virtual bool UsingTCPFastOpen() const;
 
+  virtual int NumBytesRead() const { return num_bytes_read_; }
+  virtual double GetRTTInMs() const { return rtt_ms_; }
+
   // Socket methods:
   // Multiple outstanding requests are not supported.
   // Full duplex mode (reading and writing at the same time) is supported
   virtual int Read(IOBuffer* buf, int buf_len, CompletionCallback* callback);
   virtual int Write(IOBuffer* buf, int buf_len, CompletionCallback* callback);
   virtual bool SetReceiveBufferSize(int32 size);
   virtual bool SetSendBufferSize(int32 size);
 
  private:
   // State machine for connecting the socket.
@@ skipping 120 matching lines @@
   // Record of connectivity and transmissions, for use in speculative connection
   // histograms.
   UseHistory use_history_;
 
   // Enables experimental TCP FastOpen option.
   bool use_tcp_fastopen_;
 
   // True when TCP FastOpen is in use and we have done the connect.
   bool tcp_fastopen_connected_;
 
+  base::Time connect_start_time_;
+  int num_bytes_read_;

[wtc, 2011/06/06 17:24:05]

This byte count should be int64 to allow a long-lived
connection to transfer more than 2GB.

Make the same change to net/socket/tcp_client_socket_win.h.

[Gagan, 2011/06/08 16:26:37]

Done.

+  double rtt_ms_;
+
   DISALLOW_COPY_AND_ASSIGN(TCPClientSocketLibevent);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_