154 lines
4.1 KiB
C++
154 lines
4.1 KiB
C++
/*
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Copyright (c) 2007, 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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#ifdef TORRENT_DISK_STATS
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#include <fstream>
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#endif
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#include "libtorrent/storage.hpp"
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#include <boost/thread/thread.hpp>
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#include <boost/function.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/bind.hpp>
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#include <boost/pool/pool.hpp>
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#include <boost/noncopyable.hpp>
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#include "libtorrent/config.hpp"
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namespace libtorrent
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{
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struct disk_io_job
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{
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disk_io_job()
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: action(read)
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, buffer(0)
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, buffer_size(0)
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, piece(0)
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, offset(0)
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, priority(0)
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{}
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enum action_t
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{
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read
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, write
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, hash
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, move_storage
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, release_files
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, delete_files
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};
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action_t action;
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char* buffer;
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size_type buffer_size;
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boost::intrusive_ptr<piece_manager> storage;
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// arguments used for read and write
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int piece, offset;
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// used for move_storage. On errors, this is set
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// to the error message
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std::string str;
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// priority decides whether or not this
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// job will skip entries in the queue or
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// not. It always skips in front of entries
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// with lower priority
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int priority;
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// this is called when operation completes
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boost::function<void(int, disk_io_job const&)> callback;
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};
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// this is a singleton consisting of the thread and a queue
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// of disk io jobs
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struct disk_io_thread : boost::noncopyable
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{
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disk_io_thread(int block_size = 16 * 1024);
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~disk_io_thread();
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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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// aborts read operations
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void stop(boost::intrusive_ptr<piece_manager> s);
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void add_job(disk_io_job const& j
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, boost::function<void(int, disk_io_job const&)> const& f
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= boost::function<void(int, disk_io_job const&)>());
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#ifndef NDEBUG
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disk_io_job find_job(boost::intrusive_ptr<piece_manager> s
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, int action, int piece) const;
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#endif
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// keep track of the number of bytes in the job queue
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// at any given time. i.e. the sum of all buffer_size.
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// this is used to slow down the download global download
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// speed when the queue buffer size is too big.
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size_type queue_buffer_size() const
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{ return m_queue_buffer_size; }
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void operator()();
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char* allocate_buffer();
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void free_buffer(char* buf);
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private:
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mutable boost::mutex m_mutex;
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boost::condition m_signal;
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bool m_abort;
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std::deque<disk_io_job> m_jobs;
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size_type m_queue_buffer_size;
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// memory pool for read and write operations
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boost::pool<> m_pool;
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#ifndef NDEBUG
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int m_block_size;
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disk_io_job m_current;
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#endif
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#ifdef TORRENT_DISK_STATS
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std::ofstream m_log;
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#endif
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#ifdef TORRENT_STATS
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int m_allocations;
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#endif
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// thread for performing blocking disk io operations
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boost::thread m_disk_io_thread;
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};
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}
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