127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
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/*
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Copyright (c) 2007-2011, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_DISK_BUFFER_POOL
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#define TORRENT_DISK_BUFFER_POOL
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#include "libtorrent/config.hpp"
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#include "libtorrent/thread.hpp"
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#include "libtorrent/session_settings.hpp"
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#include "libtorrent/allocator.hpp"
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#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
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#include <boost/pool/pool.hpp>
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#endif
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
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#include <map>
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#endif
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namespace libtorrent
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{
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struct TORRENT_EXPORT disk_buffer_pool : boost::noncopyable
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{
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disk_buffer_pool(int block_size);
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
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~disk_buffer_pool();
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#endif
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
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bool is_disk_buffer(char* buffer
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, mutex::scoped_lock& l) const;
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bool is_disk_buffer(char* buffer) const;
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#endif
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char* allocate_buffer(char const* category);
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void free_buffer(char* buf);
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void free_multiple_buffers(char** bufvec, int numbufs);
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int block_size() const { return m_block_size; }
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#ifdef TORRENT_STATS
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int disk_allocations() const
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{ return m_allocations; }
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#endif
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#ifdef TORRENT_DISK_STATS
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std::ofstream m_disk_access_log;
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#endif
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void release_memory();
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int in_use() const { return m_in_use; }
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protected:
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void free_buffer_impl(char* buf, mutex::scoped_lock& l);
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// number of bytes per block. The BitTorrent
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// protocol defines the block size to 16 KiB.
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const int m_block_size;
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// number of disk buffers currently allocated
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int m_in_use;
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session_settings m_settings;
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private:
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mutable mutex m_pool_mutex;
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#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
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// memory pool for read and write operations
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// and disk cache
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boost::pool<page_aligned_allocator> m_pool;
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#endif
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#if defined TORRENT_DISK_STATS || defined TORRENT_STATS
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int m_allocations;
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#endif
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#ifdef TORRENT_DISK_STATS
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public:
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void rename_buffer(char* buf, char const* category);
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protected:
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std::map<std::string, int> m_categories;
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std::map<char*, std::string> m_buf_to_category;
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std::ofstream m_log;
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private:
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#endif
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
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int m_magic;
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#endif
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};
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}
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#endif // TORRENT_DISK_BUFFER_POOL
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