1/*
2 * Copyright (C) 2010, 2012 Apple Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "SQLiteDatabaseTracker.h"
28
29#include <mutex>
30#include <wtf/NeverDestroyed.h>
31
32namespace WebCore {
33
34namespace SQLiteDatabaseTracker {
35
36static SQLiteDatabaseTrackerClient* s_staticSQLiteDatabaseTrackerClient = nullptr;
37static unsigned s_transactionInProgressCounter = 0;
38
39static std::mutex& transactionInProgressMutex()
40{
41    static NeverDestroyed<std::mutex> tipMutex;
42    return tipMutex;
43}
44
45void setClient(SQLiteDatabaseTrackerClient* client)
46{
47    ASSERT(client);
48    ASSERT(!s_staticSQLiteDatabaseTrackerClient || s_staticSQLiteDatabaseTrackerClient == client);
49    s_staticSQLiteDatabaseTrackerClient = client;
50}
51
52void incrementTransactionInProgressCount()
53{
54    if (!s_staticSQLiteDatabaseTrackerClient)
55        return;
56
57    std::lock_guard<std::mutex> lock(transactionInProgressMutex());
58
59    s_transactionInProgressCounter++;
60    if (s_transactionInProgressCounter == 1)
61        s_staticSQLiteDatabaseTrackerClient->willBeginFirstTransaction();
62}
63
64void decrementTransactionInProgressCount()
65{
66    if (!s_staticSQLiteDatabaseTrackerClient)
67        return;
68
69    std::lock_guard<std::mutex> lock(transactionInProgressMutex());
70
71    ASSERT(s_transactionInProgressCounter);
72    s_transactionInProgressCounter--;
73
74    if (!s_transactionInProgressCounter)
75        s_staticSQLiteDatabaseTrackerClient->didFinishLastTransaction();
76}
77
78#if !ASSERT_DISABLED
79bool hasTransactionInProgress()
80{
81    return !s_staticSQLiteDatabaseTrackerClient || s_transactionInProgressCounter > 0;
82}
83#endif
84
85} // namespace SQLiteDatabaseTracker
86
87} // namespace WebCore
88