forked from premiere/premiere-libtorrent
154 lines
4.1 KiB
C++
154 lines
4.1 KiB
C++
/*
|
|
|
|
Copyright (c) 2007, Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifdef TORRENT_DISK_STATS
|
|
#include <fstream>
|
|
#endif
|
|
|
|
#include "libtorrent/storage.hpp"
|
|
#include <boost/thread/thread.hpp>
|
|
#include <boost/function.hpp>
|
|
#include <boost/thread/mutex.hpp>
|
|
#include <boost/bind.hpp>
|
|
#include <boost/pool/pool.hpp>
|
|
#include <boost/noncopyable.hpp>
|
|
#include "libtorrent/config.hpp"
|
|
|
|
namespace libtorrent
|
|
{
|
|
|
|
struct disk_io_job
|
|
{
|
|
disk_io_job()
|
|
: action(read)
|
|
, buffer(0)
|
|
, buffer_size(0)
|
|
, piece(0)
|
|
, offset(0)
|
|
, priority(0)
|
|
{}
|
|
|
|
enum action_t
|
|
{
|
|
read
|
|
, write
|
|
, hash
|
|
, move_storage
|
|
, release_files
|
|
, delete_files
|
|
};
|
|
|
|
action_t action;
|
|
|
|
char* buffer;
|
|
size_type buffer_size;
|
|
boost::intrusive_ptr<piece_manager> storage;
|
|
// arguments used for read and write
|
|
int piece, offset;
|
|
// used for move_storage. On errors, this is set
|
|
// to the error message
|
|
std::string str;
|
|
|
|
// priority decides whether or not this
|
|
// job will skip entries in the queue or
|
|
// not. It always skips in front of entries
|
|
// with lower priority
|
|
int priority;
|
|
|
|
// this is called when operation completes
|
|
boost::function<void(int, disk_io_job const&)> callback;
|
|
};
|
|
|
|
// this is a singleton consisting of the thread and a queue
|
|
// of disk io jobs
|
|
struct disk_io_thread : boost::noncopyable
|
|
{
|
|
disk_io_thread(int block_size = 16 * 1024);
|
|
~disk_io_thread();
|
|
|
|
#ifdef TORRENT_STATS
|
|
int disk_allocations() const
|
|
{ return m_allocations; }
|
|
#endif
|
|
|
|
// aborts read operations
|
|
void stop(boost::intrusive_ptr<piece_manager> s);
|
|
void add_job(disk_io_job const& j
|
|
, boost::function<void(int, disk_io_job const&)> const& f
|
|
= boost::function<void(int, disk_io_job const&)>());
|
|
|
|
#ifndef NDEBUG
|
|
disk_io_job find_job(boost::intrusive_ptr<piece_manager> s
|
|
, int action, int piece) const;
|
|
#endif
|
|
// keep track of the number of bytes in the job queue
|
|
// at any given time. i.e. the sum of all buffer_size.
|
|
// this is used to slow down the download global download
|
|
// speed when the queue buffer size is too big.
|
|
size_type queue_buffer_size() const
|
|
{ return m_queue_buffer_size; }
|
|
|
|
void operator()();
|
|
|
|
char* allocate_buffer();
|
|
void free_buffer(char* buf);
|
|
|
|
private:
|
|
|
|
mutable boost::mutex m_mutex;
|
|
boost::condition m_signal;
|
|
bool m_abort;
|
|
std::deque<disk_io_job> m_jobs;
|
|
size_type m_queue_buffer_size;
|
|
|
|
// memory pool for read and write operations
|
|
boost::pool<> m_pool;
|
|
|
|
#ifndef NDEBUG
|
|
int m_block_size;
|
|
disk_io_job m_current;
|
|
#endif
|
|
|
|
#ifdef TORRENT_DISK_STATS
|
|
std::ofstream m_log;
|
|
#endif
|
|
#ifdef TORRENT_STATS
|
|
int m_allocations;
|
|
#endif
|
|
|
|
// thread for performing blocking disk io operations
|
|
boost::thread m_disk_io_thread;
|
|
};
|
|
|
|
}
|
|
|