net/quic/quic_blocked_writer_interface.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This is an interface for all objects that want to be notified that
   6 // the underlying UDP socket is available for writing (not write blocked
   7 // anymore).
   8
   9 #ifndef NET_QUIC_QUIC_BLOCKED_WRITER_INTERFACE_H_
  10 #define NET_QUIC_QUIC_BLOCKED_WRITER_INTERFACE_H_
  11
  12 #include "net/base/net_export.h"
  13
  14 namespace net {
  15
  16 class NET_EXPORT_PRIVATE QuicBlockedWriterInterface {
  17  public:
  18   virtual ~QuicBlockedWriterInterface() {}
  19
  20   // Called by the PacketWriter when the underlying socket becomes writable
  21   // so that the BlockedWriter can go ahead and try writing.
  22   virtual void OnCanWrite() = 0;
  23 };
  24
  25 }  // namespace net
  26
  27 #if defined(COMPILER_GCC)
  28 namespace BASE_HASH_NAMESPACE {
  29 // Hash pointers as if they were int's, but bring more entropy to the lower
  30 // bits.
  31 template <>
  32 struct hash<net::QuicBlockedWriterInterface*> {
  33   std::size_t operator()(const net::QuicBlockedWriterInterface* ptr) const {
  34     size_t k = reinterpret_cast<size_t>(ptr);
  35     return k + (k >> 6);
  36   }
  37 };
  38 }
  39 #endif
  40
  41 #endif  // NET_QUIC_QUIC_BLOCKED_WRITER_INTERFACE_H_