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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 #ifndef BASE_SHARED_MEMORY_H_ | 5 #ifndef BASE_SHARED_MEMORY_H_ |
6 #define BASE_SHARED_MEMORY_H_ | 6 #define BASE_SHARED_MEMORY_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "build/build_config.h" | 9 #include "build/build_config.h" |
10 | 10 |
11 #if defined(OS_POSIX) | 11 #if defined(OS_POSIX) |
12 #include <sys/types.h> | 12 #include <sys/types.h> |
13 #include <semaphore.h> | 13 #include <semaphore.h> |
14 #include "base/file_descriptor_posix.h" | 14 #include "base/file_descriptor_posix.h" |
15 #endif | 15 #endif |
16 #include <string> | 16 #include <string> |
17 | 17 |
18 #include "base/base_api.h" | 18 #include "base/base_export.h" |
19 #include "base/basictypes.h" | 19 #include "base/basictypes.h" |
20 #include "base/process.h" | 20 #include "base/process.h" |
21 | 21 |
22 class FilePath; | 22 class FilePath; |
23 | 23 |
24 namespace base { | 24 namespace base { |
25 | 25 |
26 // SharedMemoryHandle is a platform specific type which represents | 26 // SharedMemoryHandle is a platform specific type which represents |
27 // the underlying OS handle to a shared memory segment. | 27 // the underlying OS handle to a shared memory segment. |
28 #if defined(OS_WIN) | 28 #if defined(OS_WIN) |
29 typedef HANDLE SharedMemoryHandle; | 29 typedef HANDLE SharedMemoryHandle; |
30 typedef HANDLE SharedMemoryLock; | 30 typedef HANDLE SharedMemoryLock; |
31 #elif defined(OS_POSIX) | 31 #elif defined(OS_POSIX) |
32 // A SharedMemoryId is sufficient to identify a given shared memory segment on a | 32 // A SharedMemoryId is sufficient to identify a given shared memory segment on a |
33 // system, but insufficient to map it. | 33 // system, but insufficient to map it. |
34 typedef FileDescriptor SharedMemoryHandle; | 34 typedef FileDescriptor SharedMemoryHandle; |
35 typedef ino_t SharedMemoryId; | 35 typedef ino_t SharedMemoryId; |
36 // On POSIX, the lock is implemented as a lockf() on the mapped file, | 36 // On POSIX, the lock is implemented as a lockf() on the mapped file, |
37 // so no additional member (or definition of SharedMemoryLock) is | 37 // so no additional member (or definition of SharedMemoryLock) is |
38 // needed. | 38 // needed. |
39 #endif | 39 #endif |
40 | 40 |
41 // Platform abstraction for shared memory. Provides a C++ wrapper | 41 // Platform abstraction for shared memory. Provides a C++ wrapper |
42 // around the OS primitive for a memory mapped file. | 42 // around the OS primitive for a memory mapped file. |
43 class BASE_API SharedMemory { | 43 class BASE_EXPORT SharedMemory { |
44 public: | 44 public: |
45 SharedMemory(); | 45 SharedMemory(); |
46 | 46 |
47 #if defined(OS_WIN) | 47 #if defined(OS_WIN) |
48 // Similar to the default constructor, except that this allows for | 48 // Similar to the default constructor, except that this allows for |
49 // calling Lock() to acquire the named mutex before either Create or Open | 49 // calling Lock() to acquire the named mutex before either Create or Open |
50 // are called on Windows. | 50 // are called on Windows. |
51 explicit SharedMemory(const std::wstring& name); | 51 explicit SharedMemory(const std::wstring& name); |
52 #endif | 52 #endif |
53 | 53 |
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226 } | 226 } |
227 | 227 |
228 private: | 228 private: |
229 SharedMemory* shared_memory_; | 229 SharedMemory* shared_memory_; |
230 DISALLOW_COPY_AND_ASSIGN(SharedMemoryAutoLock); | 230 DISALLOW_COPY_AND_ASSIGN(SharedMemoryAutoLock); |
231 }; | 231 }; |
232 | 232 |
233 } // namespace base | 233 } // namespace base |
234 | 234 |
235 #endif // BASE_SHARED_MEMORY_H_ | 235 #endif // BASE_SHARED_MEMORY_H_ |
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