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1 // Copyright (c) 2009 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 #ifndef BASE_SYNC_SOCKET_H_ | |
6 #define BASE_SYNC_SOCKET_H_ | |
7 | |
8 // A socket abstraction used for sending and receiving plain | |
9 // data. Because they are blocking, they can be used to perform | |
10 // rudimentary cross-process synchronization with low latency. | |
11 | |
12 #include "base/basictypes.h" | |
13 #if defined(OS_WIN) | |
14 #include <windows.h> | |
15 #endif | |
16 #include <sys/types.h> | |
17 | |
18 | |
Paweł Hajdan Jr.
2009/11/24 06:44:23
nit: Unnecessary empty line.
sehr (please use chromium)
2009/11/24 16:13:18
Done.
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19 namespace base { | |
Paweł Hajdan Jr.
2009/11/24 06:44:23
nit: But there should be one empty line below.
sehr (please use chromium)
2009/11/24 16:13:18
Done.
| |
20 class SyncSocket { | |
21 public: | |
22 #if defined(OS_WIN) | |
23 typedef HANDLE Handle; | |
24 #else | |
25 typedef int Handle; | |
26 #endif | |
27 | |
28 // Creates a SyncSocket from a Handle. Used in transport. | |
29 explicit SyncSocket(Handle handle) : handle_(handle) { } | |
30 ~SyncSocket() { Close(); } | |
31 | |
32 // Creates an unnamed pair of connected sockets. | |
33 // pair is a pointer to an array of two SyncSockets in which connected socket | |
34 // descriptors are returned. Returns true on success, false on failure. | |
35 static bool CreatePair(SyncSocket* pair[2]); | |
36 | |
37 // Closes the SyncSocket. Returns true on success, false on failure. | |
38 bool Close(); | |
39 | |
40 // Sends the message to the remote peer of the SyncSocket. | |
41 // Note it is not safe to send messages from the same socket handle by | |
42 // multiple threads simultaneously. | |
43 // buffer is a pointer to the data to send. | |
44 // length is the length of the data to send (must be non-zero). | |
45 // Returns the number of bytes sent, or 0 upon failure. | |
46 size_t Send(const void* buffer, size_t length); | |
47 | |
48 // Receives a message from an SyncSocket. | |
49 // buffer is a pointer to the buffer to receive data. | |
50 // length is the number of bytes of data to receive (must be non-zero). | |
51 // Returns the number of bytes received, or 0 upon failure. | |
52 size_t Receive(void* buffer, size_t length); | |
53 | |
54 // Extracts the contained handle. Used for transferring between | |
55 // processes. | |
56 Handle handle() const { return handle_; } | |
57 | |
58 private: | |
59 Handle handle_; | |
60 | |
61 DISALLOW_COPY_AND_ASSIGN(SyncSocket); | |
62 }; | |
63 | |
64 } // namespace base | |
65 | |
66 #endif // BASE_SYNC_SOCKET_H_ | |
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