From dcc8cf2e65d1aa555cce12431a16547e66b469ee Mon Sep 17 00:00:00 2001
From: Steve Block <steveblock@google.com>
Date: Tue, 27 Apr 2010 16:31:00 +0100
Subject: Merge webkit.org at r58033 : Initial merge by git

Change-Id: If006c38561af287c50cd578d251629b51e4d8cd1
---
 WebCore/storage/DatabaseTracker.h | 56 ++++++++++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 18 deletions(-)

(limited to 'WebCore/storage/DatabaseTracker.h')

diff --git a/WebCore/storage/DatabaseTracker.h b/WebCore/storage/DatabaseTracker.h
index 4640b18..fdfbb65 100644
--- a/WebCore/storage/DatabaseTracker.h
+++ b/WebCore/storage/DatabaseTracker.h
@@ -52,7 +52,6 @@ struct SecurityOriginHash;
 
 #if !PLATFORM(CHROMIUM)
 class DatabaseTrackerClient;
-class OriginQuotaManager;
 
 struct SecurityOriginTraits;
 #endif // !PLATFORM(CHROMIUM)
@@ -60,9 +59,11 @@ struct SecurityOriginTraits;
 class DatabaseTracker : public Noncopyable {
 public:
     static DatabaseTracker& tracker();
-    // FIXME: Due to workers having multiple threads in a single process sharing
-    // a DatabaseTracker, this singleton will have to be synchronized or moved
-    // to TLS.
+    // This singleton will potentially be used from multiple worker threads and the page's context thread simultaneously.  To keep this safe, it's
+    // currently using 4 locks.  In order to avoid deadlock when taking multiple locks, you must take them in the correct order:
+    // m_databaseGuard before quotaManager if both locks are needed.
+    // no other lock is taken in the code locked on m_openDatabaseMapGuard.
+    // notificationMutex() is currently independent of the other locks.
 
     bool canEstablishDatabase(ScriptExecutionContext*, const String& name, const String& displayName, unsigned long estimatedSize);
     void setDatabaseDetails(SecurityOrigin*, const String& name, const String& displayName, unsigned long estimatedSize);
@@ -73,6 +74,7 @@ public:
     void getOpenDatabases(SecurityOrigin* origin, const String& name, HashSet<RefPtr<Database> >* databases);
 
     unsigned long long getMaxSizeForDatabase(const Database*);
+    void databaseChanged(Database*);
 
 private:
     DatabaseTracker();
@@ -87,7 +89,7 @@ private:
 #if !PLATFORM(CHROMIUM)
 public:
     void setDatabaseDirectoryPath(const String&);
-    const String& databaseDirectoryPath() const;
+    String databaseDirectoryPath() const;
 
     void origins(Vector<RefPtr<SecurityOrigin> >& result);
     bool databaseNamesForOrigin(SecurityOrigin*, Vector<String>& result);
@@ -100,20 +102,23 @@ public:
     void setQuota(SecurityOrigin*, unsigned long long);
 
     void deleteAllDatabases();
-    void deleteOrigin(SecurityOrigin*);
-    void deleteDatabase(SecurityOrigin*, const String& name);
+    bool deleteOrigin(SecurityOrigin*);
+    bool deleteDatabase(SecurityOrigin*, const String& name);
 
     void setClient(DatabaseTrackerClient*);
 
     // From a secondary thread, must be thread safe with its data
     void scheduleNotifyDatabaseChanged(SecurityOrigin*, const String& name);
 
-    OriginQuotaManager& originQuotaManager();
-
-
     bool hasEntryForOrigin(SecurityOrigin*);
 
 private:
+    bool hasEntryForOriginNoLock(SecurityOrigin* origin);
+    String fullPathForDatabaseNoLock(SecurityOrigin*, const String& name, bool createIfDoesNotExist);
+    bool databaseNamesForOriginNoLock(SecurityOrigin* origin, Vector<String>& resultVector);
+    unsigned long long usageForOriginNoLock(SecurityOrigin* origin);
+    unsigned long long quotaForOriginNoLock(SecurityOrigin* origin);
+
     String trackerDatabasePath() const;
     void openTrackerDatabase(bool createIfDoesNotExist);
 
@@ -126,23 +131,38 @@ private:
 
     bool deleteDatabaseFile(SecurityOrigin*, const String& name);
 
+    // This lock protects m_database, m_quotaMap, m_proposedDatabases, m_databaseDirectoryPath, m_originsBeingDeleted, m_beingCreated, and m_beingDeleted.
+    Mutex m_databaseGuard;
     SQLiteDatabase m_database;
 
     typedef HashMap<RefPtr<SecurityOrigin>, unsigned long long, SecurityOriginHash> QuotaMap;
-    Mutex m_quotaMapGuard;
     mutable OwnPtr<QuotaMap> m_quotaMap;
 
-    OwnPtr<OriginQuotaManager> m_quotaManager;
-
     String m_databaseDirectoryPath;
 
     DatabaseTrackerClient* m_client;
 
-    std::pair<SecurityOrigin*, DatabaseDetails>* m_proposedDatabase;
-
-#ifndef NDEBUG
-    ThreadIdentifier m_thread;
-#endif
+    typedef std::pair<RefPtr<SecurityOrigin>, DatabaseDetails> ProposedDatabase;
+    HashSet<ProposedDatabase*> m_proposedDatabases;
+
+    typedef HashMap<String, long> NameCountMap;
+    typedef HashMap<RefPtr<SecurityOrigin>, NameCountMap*, SecurityOriginHash> CreateSet;
+    CreateSet m_beingCreated;
+    typedef HashSet<String> NameSet;
+    HashMap<RefPtr<SecurityOrigin>, NameSet*, SecurityOriginHash> m_beingDeleted;
+    HashSet<RefPtr<SecurityOrigin>, SecurityOriginHash> m_originsBeingDeleted;
+    bool canCreateDatabase(SecurityOrigin *origin, const String& name);
+    void recordCreatingDatabase(SecurityOrigin *origin, const String& name);
+    void doneCreatingDatabase(SecurityOrigin *origin, const String& name);
+    bool creatingDatabase(SecurityOrigin *origin, const String& name);
+    bool canDeleteDatabase(SecurityOrigin *origin, const String& name);
+    void recordDeletingDatabase(SecurityOrigin *origin, const String& name);
+    void doneDeletingDatabase(SecurityOrigin *origin, const String& name);
+    bool deletingDatabase(SecurityOrigin *origin, const String& name);
+    bool canDeleteOrigin(SecurityOrigin *origin);
+    bool deletingOrigin(SecurityOrigin *origin);
+    void recordDeletingOrigin(SecurityOrigin *origin);
+    void doneDeletingOrigin(SecurityOrigin *origin);
 
     static void scheduleForNotification();
     static void notifyDatabasesChanged(void*);
-- 
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