Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(231)

Side by Side Diff: net/disk_cache/file_lock.h

Issue 7529043: Rename NET_API to NET_EXPORT, and rename NET_TEST to NET_EXPORT_PRIVATE. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View unified diff | Download patch | Annotate | Revision Log
OLDNEW
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_FILE_LOCK_H__ 7 #ifndef NET_DISK_CACHE_FILE_LOCK_H__
8 #define NET_DISK_CACHE_FILE_LOCK_H__ 8 #define NET_DISK_CACHE_FILE_LOCK_H__
9 #pragma once 9 #pragma once
10 10
11 #include "net/base/net_api.h" 11 #include "net/base/net_export.h"
12 #include "net/disk_cache/disk_format.h" 12 #include "net/disk_cache/disk_format.h"
13 13
14 namespace disk_cache { 14 namespace disk_cache {
15 15
16 // This class implements a file lock that lives on the header of a memory mapped 16 // This class implements a file lock that lives on the header of a memory mapped
17 // file. This is NOT a thread related lock, it is a lock to detect corruption 17 // file. This is NOT a thread related lock, it is a lock to detect corruption
18 // of the file when the process crashes in the middle of an update. 18 // of the file when the process crashes in the middle of an update.
19 // The lock is acquired on the constructor and released on the destructor. 19 // The lock is acquired on the constructor and released on the destructor.
20 // The typical use of the class is: 20 // The typical use of the class is:
21 // { 21 // {
22 // BlockFileHeader* header = GetFileHeader(); 22 // BlockFileHeader* header = GetFileHeader();
23 // FileLock lock(header); 23 // FileLock lock(header);
24 // header->max_entries = num_entries; 24 // header->max_entries = num_entries;
25 // // At this point the destructor is going to release the lock. 25 // // At this point the destructor is going to release the lock.
26 // } 26 // }
27 // It is important to perform Lock() and Unlock() operations in the right order, 27 // It is important to perform Lock() and Unlock() operations in the right order,
28 // because otherwise the desired effect of the "lock" will not be achieved. If 28 // because otherwise the desired effect of the "lock" will not be achieved. If
29 // the operations are inlined / optimized, the "locked" operations can happen 29 // the operations are inlined / optimized, the "locked" operations can happen
30 // outside the lock. 30 // outside the lock.
31 class NET_TEST FileLock { 31 class NET_EXPORT_PRIVATE FileLock {
32 public: 32 public:
33 explicit FileLock(BlockFileHeader* header); 33 explicit FileLock(BlockFileHeader* header);
34 virtual ~FileLock(); 34 virtual ~FileLock();
35 35
36 // Virtual to make sure the compiler never inlines the calls. 36 // Virtual to make sure the compiler never inlines the calls.
37 virtual void Lock(); 37 virtual void Lock();
38 virtual void Unlock(); 38 virtual void Unlock();
39 private: 39 private:
40 bool acquired_; 40 bool acquired_;
41 volatile int32* updating_; 41 volatile int32* updating_;
42 }; 42 };
43 43
44 } // namespace disk_cache 44 } // namespace disk_cache
45 45
46 #endif // NET_DISK_CACHE_FILE_LOCK_H__ 46 #endif // NET_DISK_CACHE_FILE_LOCK_H__
OLDNEW
« net/disk_cache/disk_cache.h ('K') | « net/disk_cache/file.h ('k') | net/disk_cache/hash.h » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698