UDP: Windows implementation using non-blocking IO

net/udp/udp_client_socket.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_UDP_CLIENT_SOCKET_H_
 #define NET_SOCKET_UDP_CLIENT_SOCKET_H_
 
 #include "net/base/net_log.h"
 #include "net/base/rand_callback.h"
 #include "net/udp/datagram_client_socket.h"
@@ skipping 20 matching lines @@
   int Write(IOBuffer* buf,
             int buf_len,
             const CompletionCallback& callback) override;
   void Close() override;
   int GetPeerAddress(IPEndPoint* address) const override;
   int GetLocalAddress(IPEndPoint* address) const override;
   int SetReceiveBufferSize(int32 size) override;
   int SetSendBufferSize(int32 size) override;
   const BoundNetLog& NetLog() const override;
 
+#if defined(OS_WIN)
+  // Switch to use non-blocking IO. Must be called right after construction and
+  // before other calls.
+  void UseNonBlockingIO();
+#endif
+
  private:
   UDPSocket socket_;
   DISALLOW_COPY_AND_ASSIGN(UDPClientSocket);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_UDP_CLIENT_SOCKET_H_