| 1 | // Copyright (C) 2020 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0 |
| 3 | |
| 4 | #ifndef SYNCHRONIZED_H |
| 5 | #define SYNCHRONIZED_H |
| 6 | |
| 7 | #include <QtCore/qmutex.h> |
| 8 | |
| 9 | #include <atomic> |
| 10 | #include <vector> |
| 11 | |
| 12 | QT_BEGIN_NAMESPACE |
| 13 | |
| 14 | template<typename T> class WriteSynchronizedRef |
| 15 | { |
| 16 | Q_DISABLE_COPY_MOVE(WriteSynchronizedRef) |
| 17 | |
| 18 | public: |
| 19 | WriteSynchronizedRef(std::vector<T> &vector) Q_DECL_NOEXCEPT |
| 20 | : m_vector(vector) |
| 21 | {} |
| 22 | |
| 23 | void emplace_back(T &&value) |
| 24 | { |
| 25 | QMutexLocker lock(&m_mutex); |
| 26 | m_vector.push_back(std::move(value)); |
| 27 | } |
| 28 | |
| 29 | void emplace_back(const T &value) |
| 30 | { |
| 31 | QMutexLocker lock(&m_mutex); |
| 32 | m_vector.emplace_back(value); |
| 33 | } |
| 34 | |
| 35 | void emplace_bulk(std::vector<T> && values) |
| 36 | { |
| 37 | QMutexLocker lock(&m_mutex); |
| 38 | if (!m_vector.empty()) { |
| 39 | m_vector.insert(m_vector.cend(), std::make_move_iterator(values.begin()), |
| 40 | std::make_move_iterator(values.end())); |
| 41 | } else { |
| 42 | m_vector = std::move(values); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | private: |
| 47 | mutable QMutex m_mutex; |
| 48 | std::vector<T> &m_vector; |
| 49 | }; |
| 50 | |
| 51 | template<typename T> class ReadSynchronizedRef |
| 52 | { |
| 53 | Q_DISABLE_COPY_MOVE(ReadSynchronizedRef) |
| 54 | |
| 55 | public: |
| 56 | ReadSynchronizedRef(const std::vector<T> &v) noexcept |
| 57 | : m_vector(v) |
| 58 | {} |
| 59 | |
| 60 | size_t size() const |
| 61 | { |
| 62 | return m_vector.size(); |
| 63 | } |
| 64 | |
| 65 | bool next(T *value) const |
| 66 | { |
| 67 | const auto idx = m_next.fetch_add(i: 1, m: std::memory_order_acquire); |
| 68 | const bool hasNext = idx < m_vector.size(); |
| 69 | if (hasNext) |
| 70 | *value = m_vector[idx]; |
| 71 | return hasNext; |
| 72 | } |
| 73 | |
| 74 | private: |
| 75 | const std::vector<T> &m_vector; |
| 76 | mutable std::atomic<size_t> m_next = 0; |
| 77 | }; |
| 78 | |
| 79 | QT_END_NAMESPACE |
| 80 | |
| 81 | #endif |
| 82 |