danicoin/tests/IntegrationTestLib/ObservableValue.h
2016-01-18 15:33:29 +00:00

62 lines
1.3 KiB
C++

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