102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
#ifndef slic3r_Channel_hpp_
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#define slic3r_Channel_hpp_
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#include <memory>
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#include <deque>
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#include <condition_variable>
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#include <mutex>
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#include <utility>
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#include <boost/optional.hpp>
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namespace Slic3r {
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template<class T> class Channel
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{
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public:
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using UniqueLock = std::unique_lock<std::mutex>;
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template<class Ptr> class Unlocker
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{
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public:
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Unlocker(UniqueLock lock) : m_lock(std::move(lock)) {}
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Unlocker(const Unlocker &other) noexcept : m_lock(std::move(other.m_lock)) {} // XXX: done beacuse of MSVC 2013 not supporting init of deleter by move
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Unlocker(Unlocker &&other) noexcept : m_lock(std::move(other.m_lock)) {}
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Unlocker& operator=(const Unlocker &other) = delete;
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Unlocker& operator=(Unlocker &&other) { m_lock = std::move(other.m_lock); }
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void operator()(Ptr*) { m_lock.unlock(); }
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private:
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mutable UniqueLock m_lock; // XXX: mutable: see above
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};
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using Queue = std::deque<T>;
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using LockedConstPtr = std::unique_ptr<const Queue, Unlocker<const Queue>>;
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using LockedPtr = std::unique_ptr<Queue, Unlocker<Queue>>;
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Channel() {}
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~Channel() {}
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void push(const T& item, bool silent = false)
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{
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{
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UniqueLock lock(m_mutex);
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m_queue.push_back(item);
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}
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if (! silent) { m_condition.notify_one(); }
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}
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void push(T &&item, bool silent = false)
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{
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{
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UniqueLock lock(m_mutex);
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m_queue.push_back(std::forward<T>(item));
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}
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if (! silent) { m_condition.notify_one(); }
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}
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T pop()
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{
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UniqueLock lock(m_mutex);
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m_condition.wait(lock, [this]() { return !m_queue.empty(); });
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auto item = std::move(m_queue.front());
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m_queue.pop_front();
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return item;
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}
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boost::optional<T> try_pop()
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{
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UniqueLock lock(m_mutex);
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if (m_queue.empty()) {
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return boost::none;
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} else {
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auto item = std::move(m_queue.front());
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m_queue.pop();
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return item;
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}
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}
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// Unlocked observer/hint. Thread unsafe! Keep in mind you need to re-verify the result after locking.
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size_t size_hint() const noexcept { return m_queue.size(); }
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LockedConstPtr lock_read() const
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{
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return LockedConstPtr(&m_queue, Unlocker<const Queue>(UniqueLock(m_mutex)));
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}
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LockedPtr lock_rw()
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{
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return LockedPtr(&m_queue, Unlocker<Queue>(UniqueLock(m_mutex)));
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}
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private:
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Queue m_queue;
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mutable std::mutex m_mutex;
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std::condition_variable m_condition;
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};
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} // namespace Slic3r
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#endif // slic3r_Channel_hpp_
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