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60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
/*****************************************************************************
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* Copyright (c) 2020, Hobu, Inc. (info@hobu.co) *
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* *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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****************************************************************************/
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#include <mutex>
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#include "BufferCache.hpp"
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namespace untwine
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{
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namespace epf
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{
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// If we have a buffer in the cache, return it. Otherwise create a new one and return that.
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DataVecPtr BufferCache::fetch()
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{
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std::unique_lock<std::mutex> lock(m_mutex);
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m_cv.wait(lock, [this](){ return m_buffers.size() || m_count < MaxBuffers; });
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if (m_buffers.size())
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{
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DataVecPtr buf(std::move(m_buffers.back()));
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m_buffers.pop_back();
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return buf;
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}
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// m_count tracks the number of created buffers. We only create MaxBuffers buffers.
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// If we've created that many, we wait until one is available.
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m_count++;
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return DataVecPtr(new DataVec(BufSize));
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}
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// Put a buffer back in the cache.
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void BufferCache::replace(DataVecPtr&& buf)
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{
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std::unique_lock<std::mutex> lock(m_mutex);
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//ABELL - Fix this.
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// buf->resize(BufSize);
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m_buffers.push_back(std::move(buf));
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if (m_count == MaxBuffers)
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{
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lock.unlock();
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m_cv.notify_one();
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}
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}
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} // namespace epf
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} // namespace untwine
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