104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
#pragma once
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#include <vector>
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#include <assert.h>
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template<typename T>
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class GarbageCollector
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{
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struct EpochHolder
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{
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uint64_t tstamp;
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std::vector<std::unique_ptr<T>> m_vecObjs;
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bool operator<(uint64_t tstamp) const
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{
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return this->tstamp < tstamp;
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}
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bool operator==(uint64_t tstamp) const
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{
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return this->tstamp == tstamp;
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}
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};
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public:
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uint64_t startEpoch()
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{
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std::unique_lock<fastlock> lock(m_lock);
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++m_epochNext;
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m_setepochOutstanding.insert(m_epochNext);
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return m_epochNext;
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}
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void shutdown()
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{
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std::unique_lock<fastlock> lock(m_lock);
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m_vecepochs.clear();
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}
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void endEpoch(uint64_t epoch, bool fNoFree = false)
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{
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std::unique_lock<fastlock> lock(m_lock);
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assert(m_setepochOutstanding.find(epoch) != m_setepochOutstanding.end());
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bool fMinElement = *std::min_element(m_setepochOutstanding.begin(), m_setepochOutstanding.end());
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m_setepochOutstanding.erase(epoch);
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if (fNoFree)
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return;
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std::vector<EpochHolder> vecclean;
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// No outstanding epochs?
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if (m_setepochOutstanding.empty())
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{
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vecclean = std::move(m_vecepochs); // Everything goes!
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}
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else
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{
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uint64_t minepoch = *std::min_element(m_setepochOutstanding.begin(), m_setepochOutstanding.end());
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if (minepoch == 0)
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return; // No available epochs to free
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// Clean any epochs available (after the lock)
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for (size_t iepoch = 0; iepoch < m_vecepochs.size(); ++iepoch)
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{
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auto &e = m_vecepochs[iepoch];
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if (e < minepoch)
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{
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vecclean.emplace_back(std::move(e));
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m_vecepochs.erase(m_vecepochs.begin() + iepoch);
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--iepoch;
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}
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}
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assert(vecclean.empty() || fMinElement);
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}
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lock.unlock(); // don't hold it for the potentially long delete of vecclean
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}
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void enqueue(uint64_t epoch, std::unique_ptr<T> &&sp)
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{
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std::unique_lock<fastlock> lock(m_lock);
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assert(m_setepochOutstanding.find(epoch) != m_setepochOutstanding.end());
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assert(sp->FWillFreeChildDebug() == false);
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auto itr = std::find(m_vecepochs.begin(), m_vecepochs.end(), m_epochNext+1);
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if (itr == m_vecepochs.end())
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{
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EpochHolder e;
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e.tstamp = m_epochNext+1;
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e.m_vecObjs.push_back(std::move(sp));
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m_vecepochs.emplace_back(std::move(e));
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}
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else
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{
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itr->m_vecObjs.push_back(std::move(sp));
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}
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}
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private:
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fastlock m_lock { "Garbage Collector"};
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std::vector<EpochHolder> m_vecepochs;
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std::set<uint64_t> m_setepochOutstanding;
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uint64_t m_epochNext = 0;
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}; |