1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/*
* Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DatabaseThread_h
#define DatabaseThread_h
#if ENABLE(SQL_DATABASE)
#include <wtf/Deque.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/MessageQueue.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
class DatabaseBackend;
class DatabaseTask;
class DatabaseTaskSynchronizer;
class Document;
class SQLTransactionClient;
class SQLTransactionCoordinator;
class DatabaseThread : public ThreadSafeRefCounted<DatabaseThread> {
public:
static PassRefPtr<DatabaseThread> create() { return adoptRef(new DatabaseThread); }
~DatabaseThread();
bool start();
void requestTermination(DatabaseTaskSynchronizer* cleanupSync);
bool terminationRequested(DatabaseTaskSynchronizer* taskSynchronizer = 0) const;
void scheduleTask(std::unique_ptr<DatabaseTask>);
void scheduleImmediateTask(std::unique_ptr<DatabaseTask>); // This just adds the task to the front of the queue - the caller needs to be extremely careful not to create deadlocks when waiting for completion.
void unscheduleDatabaseTasks(DatabaseBackend*);
void recordDatabaseOpen(DatabaseBackend*);
void recordDatabaseClosed(DatabaseBackend*);
ThreadIdentifier getThreadID() { return m_threadID; }
SQLTransactionClient* transactionClient() { return m_transactionClient.get(); }
SQLTransactionCoordinator* transactionCoordinator() { return m_transactionCoordinator.get(); }
#if PLATFORM(IOS)
void setPaused(bool);
void handlePausedQueue();
#endif
private:
DatabaseThread();
static void databaseThreadStart(void*);
void databaseThread();
Mutex m_threadCreationMutex;
ThreadIdentifier m_threadID;
RefPtr<DatabaseThread> m_selfRef;
MessageQueue<DatabaseTask> m_queue;
#if PLATFORM(IOS)
MessageQueue<DatabaseTask> m_pausedQueue;
Mutex m_pausedMutex;
volatile bool m_paused;
#endif
// This set keeps track of the open databases that have been used on this thread.
typedef HashSet<RefPtr<DatabaseBackend>> DatabaseSet;
DatabaseSet m_openDatabaseSet;
OwnPtr<SQLTransactionClient> m_transactionClient;
OwnPtr<SQLTransactionCoordinator> m_transactionCoordinator;
DatabaseTaskSynchronizer* m_cleanupSync;
};
} // namespace WebCore
#endif // ENABLE(SQL_DATABASE)
#endif // DatabaseThread_h
|
