63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
// Copyright (c) 2011-2016 The Cryptonote developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#pragma once
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#include <mutex>
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#include <condition_variable>
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template <typename T>
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class ObservableValueBase {
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public:
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ObservableValueBase(std::mutex& mtx, std::condition_variable& cv, const T defaultValue = T()) :
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m_mutex(mtx), m_cv(cv), m_value(defaultValue), m_updated(false) {
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}
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void set(T value) {
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std::lock_guard<std::mutex> lk(m_mutex);
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m_value = value;
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m_updated = true;
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m_cv.notify_all();
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}
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void increment() {
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std::lock_guard<std::mutex> lk(m_mutex);
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++m_value;
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m_updated = true;
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m_cv.notify_all();
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}
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T get() {
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std::lock_guard<std::mutex> lk(m_mutex);
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return m_value;
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}
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bool waitFor(std::chrono::milliseconds ms, T& value) {
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std::unique_lock<std::mutex> lk(m_mutex);
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if (m_cv.wait_for(lk, ms, [this] { return m_updated; })) {
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value = m_value;
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m_updated = false;
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return true;
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}
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return false;
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}
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T wait() {
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std::unique_lock<std::mutex> lk(m_mutex);
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m_cv.wait(lk, [this] { return m_updated; });
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m_updated = false;
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return m_value;
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}
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private:
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std::mutex& m_mutex;
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std::condition_variable& m_cv;
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T m_value;
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bool m_updated;
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};
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