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1 /* | 1 /* |
2 * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved. | 2 * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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46 class DatabaseContext; | 46 class DatabaseContext; |
47 class Page; | 47 class Page; |
48 class SecurityOrigin; | 48 class SecurityOrigin; |
49 | 49 |
50 class MODULES_EXPORT DatabaseTracker { | 50 class MODULES_EXPORT DatabaseTracker { |
51 WTF_MAKE_NONCOPYABLE(DatabaseTracker); | 51 WTF_MAKE_NONCOPYABLE(DatabaseTracker); |
52 USING_FAST_MALLOC(DatabaseTracker); | 52 USING_FAST_MALLOC(DatabaseTracker); |
53 | 53 |
54 public: | 54 public: |
55 static DatabaseTracker& tracker(); | 55 static DatabaseTracker& tracker(); |
56 // This singleton will potentially be used from multiple worker threads and th
e page's context thread simultaneously. To keep this safe, it's | 56 // This singleton will potentially be used from multiple worker threads and |
57 // currently using 4 locks. In order to avoid deadlock when taking multiple l
ocks, you must take them in the correct order: | 57 // the page's context thread simultaneously. To keep this safe, it's |
| 58 // currently using 4 locks. In order to avoid deadlock when taking multiple |
| 59 // locks, you must take them in the correct order: |
58 // m_databaseGuard before quotaManager if both locks are needed. | 60 // m_databaseGuard before quotaManager if both locks are needed. |
59 // m_openDatabaseMapGuard before quotaManager if both locks are needed. | 61 // m_openDatabaseMapGuard before quotaManager if both locks are needed. |
60 // m_databaseGuard and m_openDatabaseMapGuard currently don't overlap. | 62 // m_databaseGuard and m_openDatabaseMapGuard currently don't overlap. |
61 // notificationMutex() is currently independent of the other locks. | 63 // notificationMutex() is currently independent of the other locks. |
62 | 64 |
63 bool canEstablishDatabase(DatabaseContext*, | 65 bool canEstablishDatabase(DatabaseContext*, |
64 const String& name, | 66 const String& name, |
65 const String& displayName, | 67 const String& displayName, |
66 unsigned estimatedSize, | 68 unsigned estimatedSize, |
67 DatabaseError&); | 69 DatabaseError&); |
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94 Database*); | 96 Database*); |
95 | 97 |
96 Mutex m_openDatabaseMapGuard; | 98 Mutex m_openDatabaseMapGuard; |
97 | 99 |
98 mutable std::unique_ptr<DatabaseOriginMap> m_openDatabaseMap; | 100 mutable std::unique_ptr<DatabaseOriginMap> m_openDatabaseMap; |
99 }; | 101 }; |
100 | 102 |
101 } // namespace blink | 103 } // namespace blink |
102 | 104 |
103 #endif // DatabaseTracker_h | 105 #endif // DatabaseTracker_h |
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