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
14namespace net {
15
16class 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)
28namespace BASE_HASH_NAMESPACE {
29// Hash pointers as if they were int's, but bring more entropy to the lower
30// bits.
31template <>
32struct 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_
42