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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 // See net/disk_cache/disk_cache.h for the public interface of the cache. | 5 // See net/disk_cache/disk_cache.h for the public interface of the cache. |
6 | 6 |
7 #ifndef NET_DISK_CACHE_BLOCKFILE_FILE_LOCK_H_ | 7 #ifndef NET_DISK_CACHE_BLOCKFILE_FILE_LOCK_H_ |
8 #define NET_DISK_CACHE_BLOCKFILE_FILE_LOCK_H_ | 8 #define NET_DISK_CACHE_BLOCKFILE_FILE_LOCK_H_ |
9 | 9 |
| 10 #include <stdint.h> |
| 11 |
10 #include "net/base/net_export.h" | 12 #include "net/base/net_export.h" |
11 #include "net/disk_cache/blockfile/disk_format_base.h" | 13 #include "net/disk_cache/blockfile/disk_format_base.h" |
12 | 14 |
13 namespace disk_cache { | 15 namespace disk_cache { |
14 | 16 |
15 // This class implements a file lock that lives on the header of a memory mapped | 17 // This class implements a file lock that lives on the header of a memory mapped |
16 // file. This is NOT a thread related lock, it is a lock to detect corruption | 18 // file. This is NOT a thread related lock, it is a lock to detect corruption |
17 // of the file when the process crashes in the middle of an update. | 19 // of the file when the process crashes in the middle of an update. |
18 // The lock is acquired on the constructor and released on the destructor. | 20 // The lock is acquired on the constructor and released on the destructor. |
19 // The typical use of the class is: | 21 // The typical use of the class is: |
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30 class NET_EXPORT_PRIVATE FileLock { | 32 class NET_EXPORT_PRIVATE FileLock { |
31 public: | 33 public: |
32 explicit FileLock(BlockFileHeader* header); | 34 explicit FileLock(BlockFileHeader* header); |
33 virtual ~FileLock(); | 35 virtual ~FileLock(); |
34 | 36 |
35 // Virtual to make sure the compiler never inlines the calls. | 37 // Virtual to make sure the compiler never inlines the calls. |
36 virtual void Lock(); | 38 virtual void Lock(); |
37 virtual void Unlock(); | 39 virtual void Unlock(); |
38 private: | 40 private: |
39 bool acquired_; | 41 bool acquired_; |
40 volatile int32* updating_; | 42 volatile int32_t* updating_; |
41 }; | 43 }; |
42 | 44 |
43 } // namespace disk_cache | 45 } // namespace disk_cache |
44 | 46 |
45 #endif // NET_DISK_CACHE_BLOCKFILE_FILE_LOCK_H_ | 47 #endif // NET_DISK_CACHE_BLOCKFILE_FILE_LOCK_H_ |
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