blob: 65bef5463d8a14b26a2ef385de003001c29d80ab (
plain)
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
|
// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#ifndef SYNCHRONIZED_H
#define SYNCHRONIZED_H
#include <QtCore/qmutex.h>
#include <atomic>
#include <vector>
QT_BEGIN_NAMESPACE
template<typename T> class WriteSynchronizedRef
{
Q_DISABLE_COPY_MOVE(WriteSynchronizedRef)
public:
WriteSynchronizedRef(std::vector<T> &vector) Q_DECL_NOEXCEPT
: m_vector(vector)
{}
void emplace_back(T &&value)
{
QMutexLocker lock(&m_mutex);
m_vector.push_back(std::move(value));
}
void emplace_back(const T &value)
{
QMutexLocker lock(&m_mutex);
m_vector.emplace_back(value);
}
void emplace_bulk(std::vector<T> && values)
{
QMutexLocker lock(&m_mutex);
if (!m_vector.empty()) {
m_vector.insert(m_vector.cend(), std::make_move_iterator(values.begin()),
std::make_move_iterator(values.end()));
} else {
m_vector = std::move(values);
}
}
private:
mutable QMutex m_mutex;
std::vector<T> &m_vector;
};
template<typename T> class ReadSynchronizedRef
{
Q_DISABLE_COPY_MOVE(ReadSynchronizedRef)
public:
ReadSynchronizedRef(const std::vector<T> &v) noexcept
: m_vector(v)
{}
size_t size() const
{
return m_vector.size();
}
bool next(T *value) const
{
const auto idx = m_next.fetch_add(1, std::memory_order_acquire);
const bool hasNext = idx < m_vector.size();
if (hasNext)
*value = m_vector[idx];
return hasNext;
}
private:
const std::vector<T> &m_vector;
mutable std::atomic<size_t> m_next = 0;
};
QT_END_NAMESPACE
#endif
|
