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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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34 #include "wtf/HashMap.h" | 34 #include "wtf/HashMap.h" |
35 #include "wtf/HashSet.h" | 35 #include "wtf/HashSet.h" |
36 #include "wtf/ThreadingPrimitives.h" | 36 #include "wtf/ThreadingPrimitives.h" |
37 #include "wtf/text/StringHash.h" | 37 #include "wtf/text/StringHash.h" |
38 #include "wtf/text/WTFString.h" | 38 #include "wtf/text/WTFString.h" |
39 | 39 |
40 namespace blink { | 40 namespace blink { |
41 | 41 |
42 class Database; | 42 class Database; |
43 class DatabaseContext; | 43 class DatabaseContext; |
44 class OriginLock; | |
45 class SecurityOrigin; | 44 class SecurityOrigin; |
46 | 45 |
47 class DatabaseTracker { | 46 class DatabaseTracker { |
48 WTF_MAKE_NONCOPYABLE(DatabaseTracker); WTF_MAKE_FAST_ALLOCATED; | 47 WTF_MAKE_NONCOPYABLE(DatabaseTracker); WTF_MAKE_FAST_ALLOCATED; |
49 public: | 48 public: |
50 static DatabaseTracker& tracker(); | 49 static DatabaseTracker& tracker(); |
51 // This singleton will potentially be used from multiple worker threads and
the page's context thread simultaneously. To keep this safe, it's | 50 // This singleton will potentially be used from multiple worker threads and
the page's context thread simultaneously. To keep this safe, it's |
52 // currently using 4 locks. In order to avoid deadlock when taking multiple
locks, you must take them in the correct order: | 51 // currently using 4 locks. In order to avoid deadlock when taking multiple
locks, you must take them in the correct order: |
53 // m_databaseGuard before quotaManager if both locks are needed. | 52 // m_databaseGuard before quotaManager if both locks are needed. |
54 // m_openDatabaseMapGuard before quotaManager if both locks are needed. | 53 // m_openDatabaseMapGuard before quotaManager if both locks are needed. |
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81 Mutex m_openDatabaseMapGuard; | 80 Mutex m_openDatabaseMapGuard; |
82 // This map contains raw pointers to a garbage-collected class. We can't | 81 // This map contains raw pointers to a garbage-collected class. We can't |
83 // make this traceable because it is updated by multiple database threads. | 82 // make this traceable because it is updated by multiple database threads. |
84 GC_PLUGIN_IGNORE("crbug.com/417990") | 83 GC_PLUGIN_IGNORE("crbug.com/417990") |
85 mutable OwnPtr<DatabaseOriginMap> m_openDatabaseMap; | 84 mutable OwnPtr<DatabaseOriginMap> m_openDatabaseMap; |
86 }; | 85 }; |
87 | 86 |
88 } // namespace blink | 87 } // namespace blink |
89 | 88 |
90 #endif // DatabaseTracker_h | 89 #endif // DatabaseTracker_h |
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