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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/dns/dns_socket_pool.h" | 5 #include "net/dns/dns_socket_pool.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "base/rand_util.h" | 8 #include "base/rand_util.h" |
9 #include "base/stl_util.h" | 9 #include "base/stl_util.h" |
10 #include "net/base/address_list.h" | 10 #include "net/base/address_list.h" |
11 #include "net/base/ip_endpoint.h" | 11 #include "net/base/ip_endpoint.h" |
12 #include "net/base/net_errors.h" | 12 #include "net/base/net_errors.h" |
13 #include "net/base/rand_callback.h" | 13 #include "net/base/rand_callback.h" |
14 #include "net/socket/client_socket_factory.h" | 14 #include "net/socket/client_socket_factory.h" |
15 #include "net/socket/stream_socket.h" | 15 #include "net/socket/stream_socket.h" |
16 #include "net/udp/datagram_client_socket.h" | 16 #include "net/udp/datagram_client_socket.h" |
17 | 17 |
18 namespace net { | 18 namespace net { |
19 | 19 |
20 namespace { | 20 namespace { |
21 | 21 |
22 // When we initialize the SocketPool, we allocate kInitialPoolSize sockets. | 22 // When we initialize the SocketPool, we allocate kInitialPoolSize sockets. |
23 // When we allocate a socket, we ensure we have at least kAllocateMinSize | 23 // When we allocate a socket, we ensure we have at least kAllocateMinSize |
24 // sockets to choose from. When we free a socket, we retain it if we have | 24 // sockets to choose from. Freed sockets are not retained. |
25 // less than kRetainMaxSize sockets in the pool. | |
26 | 25 |
27 // On Windows, we can't request specific (random) ports, since that will | 26 // On Windows, we can't request specific (random) ports, since that will |
28 // trigger firewall prompts, so request default ones, but keep a pile of | 27 // trigger firewall prompts, so request default ones, but keep a pile of |
29 // them. Everywhere else, request fresh, random ports each time. | 28 // them. Everywhere else, request fresh, random ports each time. |
30 #if defined(OS_WIN) | 29 #if defined(OS_WIN) |
31 const DatagramSocket::BindType kBindType = DatagramSocket::DEFAULT_BIND; | 30 const DatagramSocket::BindType kBindType = DatagramSocket::DEFAULT_BIND; |
32 const unsigned kInitialPoolSize = 256; | 31 const unsigned kInitialPoolSize = 256; |
33 const unsigned kAllocateMinSize = 256; | 32 const unsigned kAllocateMinSize = 256; |
34 const unsigned kRetainMaxSize = 0; | |
35 #else | 33 #else |
36 const DatagramSocket::BindType kBindType = DatagramSocket::RANDOM_BIND; | 34 const DatagramSocket::BindType kBindType = DatagramSocket::RANDOM_BIND; |
37 const unsigned kInitialPoolSize = 0; | 35 const unsigned kInitialPoolSize = 0; |
38 const unsigned kAllocateMinSize = 1; | 36 const unsigned kAllocateMinSize = 1; |
39 const unsigned kRetainMaxSize = 0; | |
40 #endif | 37 #endif |
41 | 38 |
42 } // namespace | 39 } // namespace |
43 | 40 |
44 DnsSocketPool::DnsSocketPool(ClientSocketFactory* socket_factory) | 41 DnsSocketPool::DnsSocketPool(ClientSocketFactory* socket_factory) |
45 : socket_factory_(socket_factory), | 42 : socket_factory_(socket_factory), |
46 net_log_(NULL), | 43 net_log_(NULL), |
47 nameservers_(NULL), | 44 nameservers_(NULL), |
48 initialized_(false) { | 45 initialized_(false) { |
49 } | 46 } |
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201 pool[socket_index] = pool.back(); | 198 pool[socket_index] = pool.back(); |
202 pool.pop_back(); | 199 pool.pop_back(); |
203 | 200 |
204 return scoped_ptr<DatagramClientSocket>(socket); | 201 return scoped_ptr<DatagramClientSocket>(socket); |
205 } | 202 } |
206 | 203 |
207 void DefaultDnsSocketPool::FreeSocket( | 204 void DefaultDnsSocketPool::FreeSocket( |
208 unsigned server_index, | 205 unsigned server_index, |
209 scoped_ptr<DatagramClientSocket> socket) { | 206 scoped_ptr<DatagramClientSocket> socket) { |
210 DCHECK_LT(server_index, pools_.size()); | 207 DCHECK_LT(server_index, pools_.size()); |
211 | |
212 // In some builds, kRetainMaxSize will be 0 if we never reuse sockets. | |
213 // In that case, don't compile this code to avoid a "tautological | |
214 // comparison" warning from clang. | |
215 #if kRetainMaxSize > 0 | |
216 SocketVector& pool = pools_[server_index]; | |
217 if (pool.size() < kRetainMaxSize) | |
218 pool.push_back(socket.release()); | |
219 #endif | |
220 } | 208 } |
221 | 209 |
222 void DefaultDnsSocketPool::FillPool(unsigned server_index, unsigned size) { | 210 void DefaultDnsSocketPool::FillPool(unsigned server_index, unsigned size) { |
223 SocketVector& pool = pools_[server_index]; | 211 SocketVector& pool = pools_[server_index]; |
224 | 212 |
225 for (unsigned pool_index = pool.size(); pool_index < size; ++pool_index) { | 213 for (unsigned pool_index = pool.size(); pool_index < size; ++pool_index) { |
226 DatagramClientSocket* socket = | 214 DatagramClientSocket* socket = |
227 CreateConnectedSocket(server_index).release(); | 215 CreateConnectedSocket(server_index).release(); |
228 if (!socket) | 216 if (!socket) |
229 break; | 217 break; |
230 pool.push_back(socket); | 218 pool.push_back(socket); |
231 } | 219 } |
232 } | 220 } |
233 | 221 |
234 } // namespace net | 222 } // namespace net |
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