621 lines
21 KiB
C++
621 lines
21 KiB
C++
/*
|
|
|
|
Copyright (c) 2007-2015, 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.
|
|
|
|
*/
|
|
|
|
#ifndef TORRENT_DISK_IO_THREAD
|
|
#define TORRENT_DISK_IO_THREAD
|
|
|
|
#include "libtorrent/config.hpp"
|
|
#include "libtorrent/storage.hpp"
|
|
#include "libtorrent/allocator.hpp"
|
|
#include "libtorrent/io_service.hpp"
|
|
#include "libtorrent/sliding_average.hpp"
|
|
#include "libtorrent/disk_io_job.hpp"
|
|
#include "libtorrent/disk_job_pool.hpp"
|
|
#include "libtorrent/block_cache.hpp"
|
|
#include "libtorrent/file_pool.hpp"
|
|
#include "libtorrent/disk_interface.hpp"
|
|
#include "libtorrent/performance_counters.hpp"
|
|
#include "libtorrent/aux_/session_settings.hpp"
|
|
#include "libtorrent/thread.hpp"
|
|
|
|
#include "libtorrent/aux_/disable_warnings_push.hpp"
|
|
|
|
#include <boost/function/function0.hpp>
|
|
#include <boost/noncopyable.hpp>
|
|
#include <boost/shared_array.hpp>
|
|
#include <boost/optional.hpp>
|
|
#include <boost/shared_ptr.hpp>
|
|
#include <deque>
|
|
#ifndef TORRENT_DISABLE_POOL_ALLOCATOR
|
|
#include <boost/pool/pool.hpp>
|
|
#endif
|
|
#include <boost/atomic.hpp>
|
|
|
|
#include "libtorrent/aux_/disable_warnings_pop.hpp"
|
|
|
|
namespace libtorrent
|
|
{
|
|
class alert;
|
|
struct add_torrent_params;
|
|
struct counters;
|
|
class alert_manager;
|
|
|
|
struct cached_piece_info
|
|
{
|
|
piece_manager* storage;
|
|
|
|
// holds one entry for each block in this piece. ``true`` represents
|
|
// the data for that block being in the disk cache and ``false`` means it's not.
|
|
std::vector<bool> blocks;
|
|
|
|
// the time when a block was last written to this piece. The older
|
|
// a piece is, the more likely it is to be flushed to disk.
|
|
time_point last_use;
|
|
|
|
// The index of the next block that needs to be hashed.
|
|
// Blocks are hashed as they are downloaded in order to not
|
|
// have to re-read them from disk once the piece is complete, to
|
|
// compare its hash against the hashes in the .torrent file.
|
|
int next_to_hash;
|
|
|
|
// the piece index for this cache entry.
|
|
int piece;
|
|
|
|
enum kind_t { read_cache = 0, write_cache = 1, volatile_read_cache = 2 };
|
|
|
|
// specifies if this piece is part of the read cache or the write cache.
|
|
kind_t kind;
|
|
|
|
bool need_readback;
|
|
};
|
|
|
|
typedef tailqueue<disk_io_job> jobqueue_t;
|
|
|
|
// this struct holds a number of statistics counters
|
|
// relevant for the disk io thread and disk cache.
|
|
struct TORRENT_EXPORT cache_status
|
|
{
|
|
// initializes all counters to 0
|
|
cache_status()
|
|
: pieces()
|
|
#ifndef TORRENT_NO_DEPRECATE
|
|
, blocks_written(0)
|
|
, writes(0)
|
|
, blocks_read(0)
|
|
, blocks_read_hit(0)
|
|
, reads(0)
|
|
, queued_bytes(0)
|
|
, cache_size(0)
|
|
, write_cache_size(0)
|
|
, read_cache_size(0)
|
|
, pinned_blocks(0)
|
|
, total_used_buffers(0)
|
|
, average_read_time(0)
|
|
, average_write_time(0)
|
|
, average_hash_time(0)
|
|
, average_job_time(0)
|
|
, cumulative_job_time(0)
|
|
, cumulative_read_time(0)
|
|
, cumulative_write_time(0)
|
|
, cumulative_hash_time(0)
|
|
, total_read_back(0)
|
|
, read_queue_size(0)
|
|
, blocked_jobs(0)
|
|
, queued_jobs(0)
|
|
, peak_queued(0)
|
|
, pending_jobs(0)
|
|
, num_jobs(0)
|
|
, num_read_jobs(0)
|
|
, num_write_jobs(0)
|
|
, arc_mru_size(0)
|
|
, arc_mru_ghost_size(0)
|
|
, arc_mfu_size(0)
|
|
, arc_mfu_ghost_size(0)
|
|
, arc_write_size(0)
|
|
, arc_volatile_size(0)
|
|
, num_writing_threads(0)
|
|
#endif
|
|
{
|
|
#ifndef TORRENT_NO_DEPRECATE
|
|
memset(num_fence_jobs, 0, sizeof(num_fence_jobs));
|
|
#endif
|
|
}
|
|
|
|
std::vector<cached_piece_info> pieces;
|
|
|
|
#ifndef TORRENT_NO_DEPRECATE
|
|
// the total number of 16 KiB blocks written to disk
|
|
// since this session was started.
|
|
int blocks_written;
|
|
|
|
// the total number of write operations performed since this
|
|
// session was started.
|
|
//
|
|
// The ratio (``blocks_written`` - ``writes``) / ``blocks_written`` represents
|
|
// the number of saved write operations per total write operations. i.e. a kind
|
|
// of cache hit ratio for the write cahe.
|
|
int writes;
|
|
|
|
// the number of blocks that were requested from the
|
|
// bittorrent engine (from peers), that were served from disk or cache.
|
|
int blocks_read;
|
|
|
|
// the number of blocks that was just copied from the read cache
|
|
//
|
|
// The ratio ``blocks_read_hit`` / ``blocks_read`` is the cache hit ratio
|
|
// for the read cache.
|
|
int blocks_read_hit;
|
|
|
|
// the number of read operations used
|
|
int reads;
|
|
|
|
// the number of bytes queued for writing, including bytes
|
|
// submitted to the OS for writing, but not yet complete
|
|
mutable boost::int64_t queued_bytes;
|
|
|
|
// the number of 16 KiB blocks currently in the disk cache (both read and write).
|
|
// This includes both read and write cache.
|
|
int cache_size;
|
|
|
|
// the number of blocks in the cache used for write cache
|
|
int write_cache_size;
|
|
|
|
// the number of 16KiB blocks in the read cache.
|
|
int read_cache_size;
|
|
|
|
// the number of blocks with a refcount > 0, i.e.
|
|
// they may not be evicted
|
|
int pinned_blocks;
|
|
|
|
// the total number of buffers currently in use.
|
|
// This includes the read/write disk cache as well as send and receive buffers
|
|
// used in peer connections.
|
|
mutable int total_used_buffers;
|
|
|
|
// the number of microseconds an average disk I/O job
|
|
// has to wait in the job queue before it get processed.
|
|
|
|
// the time read jobs takes on average to complete
|
|
// (not including the time in the queue), in microseconds. This only measures
|
|
// read cache misses.
|
|
int average_read_time;
|
|
|
|
// the time write jobs takes to complete, on average,
|
|
// in microseconds. This does not include the time the job sits in the disk job
|
|
// queue or in the write cache, only blocks that are flushed to disk.
|
|
int average_write_time;
|
|
|
|
// the time hash jobs takes to complete on average, in
|
|
// microseconds. Hash jobs include running SHA-1 on the data (which for the most
|
|
// part is done incrementally) and sometimes reading back parts of the piece. It
|
|
// also includes checking files without valid resume data.
|
|
int average_hash_time;
|
|
int average_job_time;
|
|
|
|
// the number of milliseconds spent in all disk jobs, and specific ones
|
|
// since the start of the session. Times are specified in milliseconds
|
|
int cumulative_job_time;
|
|
int cumulative_read_time;
|
|
int cumulative_write_time;
|
|
int cumulative_hash_time;
|
|
|
|
// the number of blocks that had to be read back from disk because
|
|
// they were flushed before the SHA-1 hash got to hash them. If this
|
|
// is large, a larger cache could significantly improve performance
|
|
int total_read_back;
|
|
|
|
// number of read jobs in the disk job queue
|
|
int read_queue_size;
|
|
|
|
// number of jobs blocked because of a fence
|
|
int blocked_jobs;
|
|
|
|
// number of jobs waiting to be issued (m_to_issue)
|
|
// average over 30 seconds
|
|
int queued_jobs;
|
|
|
|
// largest ever seen number of queued jobs
|
|
int peak_queued;
|
|
|
|
// number of jobs waiting to complete (m_pending)
|
|
// average over 30 seconds
|
|
int pending_jobs;
|
|
|
|
// total number of disk job objects allocated right now
|
|
int num_jobs;
|
|
|
|
// total number of disk read job objects allocated right now
|
|
int num_read_jobs;
|
|
|
|
// total number of disk write job objects allocated right now
|
|
int num_write_jobs;
|
|
|
|
// ARC cache stats. All of these counters are in number of pieces
|
|
// not blocks. A piece does not necessarily correspond to a certain
|
|
// number of blocks. The pieces in the ghost list never have any
|
|
// blocks in them
|
|
int arc_mru_size;
|
|
int arc_mru_ghost_size;
|
|
int arc_mfu_size;
|
|
int arc_mfu_ghost_size;
|
|
int arc_write_size;
|
|
int arc_volatile_size;
|
|
|
|
// the number of threads currently writing to disk
|
|
int num_writing_threads;
|
|
|
|
// counts only fence jobs that are currently blocking jobs
|
|
// not fences that are themself blocked
|
|
int num_fence_jobs[disk_io_job::num_job_ids];
|
|
#endif
|
|
};
|
|
|
|
// this is a singleton consisting of the thread and a queue
|
|
// of disk io jobs
|
|
struct TORRENT_EXTRA_EXPORT disk_io_thread TORRENT_FINAL
|
|
: disk_job_pool
|
|
, disk_interface
|
|
, buffer_allocator_interface
|
|
{
|
|
disk_io_thread(io_service& ios
|
|
, counters& cnt
|
|
, void* userdata
|
|
, int block_size = 16 * 1024);
|
|
~disk_io_thread();
|
|
|
|
void set_settings(settings_pack const* sett, alert_manager& alerts);
|
|
void set_num_threads(int i, bool wait = true);
|
|
|
|
void abort(bool wait);
|
|
|
|
void async_read(piece_manager* storage, peer_request const& r
|
|
, boost::function<void(disk_io_job const*)> const& handler, void* requester
|
|
, int flags = 0);
|
|
void async_write(piece_manager* storage, peer_request const& r
|
|
, disk_buffer_holder& buffer
|
|
, boost::function<void(disk_io_job const*)> const& handler
|
|
, int flags = 0);
|
|
void async_hash(piece_manager* storage, int piece, int flags
|
|
, boost::function<void(disk_io_job const*)> const& handler, void* requester);
|
|
void async_move_storage(piece_manager* storage, std::string const& p, int flags
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_release_files(piece_manager* storage
|
|
, boost::function<void(disk_io_job const*)> const& handler
|
|
= boost::function<void(disk_io_job const*)>());
|
|
void async_delete_files(piece_manager* storage
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_check_fastresume(piece_manager* storage
|
|
, bdecode_node const* resume_data
|
|
, std::vector<std::string>& links
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_save_resume_data(piece_manager* storage
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_rename_file(piece_manager* storage, int index, std::string const& name
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_stop_torrent(piece_manager* storage
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_cache_piece(piece_manager* storage, int piece
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
#ifndef TORRENT_NO_DEPRECATE
|
|
void async_finalize_file(piece_manager* storage, int file
|
|
, boost::function<void(disk_io_job const*)> const& handler
|
|
= boost::function<void(disk_io_job const*)>());
|
|
#endif
|
|
void async_flush_piece(piece_manager* storage, int piece
|
|
, boost::function<void(disk_io_job const*)> const& handler
|
|
= boost::function<void(disk_io_job const*)>());
|
|
void async_set_file_priority(piece_manager* storage
|
|
, std::vector<boost::uint8_t> const& prio
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_load_torrent(add_torrent_params* params
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
void async_tick_torrent(piece_manager* storage
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
|
|
void clear_read_cache(piece_manager* storage);
|
|
void async_clear_piece(piece_manager* storage, int index
|
|
, boost::function<void(disk_io_job const*)> const& handler);
|
|
// this is not asynchronous and requires that the piece does not
|
|
// have any pending buffers. It's meant to be used for pieces that
|
|
// were just read and hashed and failed the hash check.
|
|
// there should be no read-operations left, and all buffers should
|
|
// be discardable
|
|
void clear_piece(piece_manager* storage, int index);
|
|
|
|
// implements buffer_allocator_interface
|
|
void reclaim_block(block_cache_reference ref);
|
|
void free_disk_buffer(char* buf) { m_disk_cache.free_buffer(buf); }
|
|
char* allocate_disk_buffer(char const* category)
|
|
{
|
|
bool exceed = false;
|
|
return allocate_disk_buffer(exceed, boost::shared_ptr<disk_observer>(), category);
|
|
}
|
|
|
|
void trigger_cache_trim();
|
|
char* allocate_disk_buffer(bool& exceeded, boost::shared_ptr<disk_observer> o
|
|
, char const* category);
|
|
char* async_allocate_disk_buffer(char const* category, boost::function<void(char*)> const& handler);
|
|
|
|
bool exceeded_cache_use() const
|
|
{ return m_disk_cache.exceeded_max_size(); }
|
|
|
|
void update_stats_counters(counters& c) const;
|
|
void get_cache_info(cache_status* ret, bool no_pieces = true
|
|
, piece_manager const* storage = 0) const;
|
|
|
|
// this submits all queued up jobs to the thread
|
|
void submit_jobs();
|
|
|
|
block_cache* cache() { return &m_disk_cache; }
|
|
|
|
#if TORRENT_USE_ASSERTS
|
|
bool is_disk_buffer(char* buffer) const { return m_disk_cache.is_disk_buffer(buffer); }
|
|
#endif
|
|
|
|
enum thread_type_t {
|
|
generic_thread,
|
|
hasher_thread
|
|
};
|
|
|
|
void thread_fun(int thread_id, thread_type_t type
|
|
, boost::shared_ptr<io_service::work> w);
|
|
|
|
file_pool& files() { return m_file_pool; }
|
|
|
|
io_service& get_io_service() { return m_ios; }
|
|
|
|
int prep_read_job_impl(disk_io_job* j, bool check_fence = true);
|
|
|
|
#if TORRENT_USE_INVARIANT_CHECKS
|
|
void check_invariant() const;
|
|
#endif
|
|
|
|
void maybe_issue_queued_read_jobs(cached_piece_entry* pe,
|
|
jobqueue_t& completed_jobs);
|
|
int do_read(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_uncached_read(disk_io_job* j);
|
|
|
|
int do_write(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_uncached_write(disk_io_job* j);
|
|
|
|
int do_hash(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_uncached_hash(disk_io_job* j);
|
|
|
|
int do_move_storage(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_release_files(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_delete_files(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_check_fastresume(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_save_resume_data(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_rename_file(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_stop_torrent(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_read_and_hash(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_cache_piece(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
#ifndef TORRENT_NO_DEPRECATE
|
|
int do_finalize_file(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
#endif
|
|
int do_flush_piece(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_flush_hashed(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_flush_storage(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_trim_cache(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_file_priority(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_load_torrent(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_clear_piece(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_tick(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
int do_resolve_links(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
|
|
void call_job_handlers(void* userdata);
|
|
|
|
private:
|
|
|
|
enum return_value_t
|
|
{
|
|
// the do_* functions can return this to indicate the disk
|
|
// job did not complete immediately, and shouldn't be posted yet
|
|
defer_handler = -200,
|
|
|
|
// the job cannot be completed right now, put it back in the
|
|
// queue and try again later
|
|
retry_job = -201
|
|
};
|
|
|
|
void add_completed_job(disk_io_job* j);
|
|
void add_completed_jobs(jobqueue_t& jobs);
|
|
void add_completed_jobs_impl(jobqueue_t& jobs
|
|
, jobqueue_t& completed_jobs);
|
|
|
|
void fail_jobs(storage_error const& e, jobqueue_t& jobs_);
|
|
void fail_jobs_impl(storage_error const& e, jobqueue_t& src, jobqueue_t& dst);
|
|
|
|
void check_cache_level(mutex::scoped_lock& l, jobqueue_t& completed_jobs);
|
|
|
|
void perform_job(disk_io_job* j, jobqueue_t& completed_jobs);
|
|
|
|
// this queues up another job to be submitted
|
|
void add_job(disk_io_job* j, bool user_add = true);
|
|
void add_fence_job(piece_manager* storage, disk_io_job* j
|
|
, bool user_add = true);
|
|
|
|
// assumes l is locked (cache mutex).
|
|
// writes out the blocks [start, end) (releases the lock
|
|
// during the file operation)
|
|
int flush_range(cached_piece_entry* p, int start, int end
|
|
, jobqueue_t& completed_jobs, mutex::scoped_lock& l);
|
|
|
|
// low level flush operations, used by flush_range
|
|
int build_iovec(cached_piece_entry* pe, int start, int end
|
|
, file::iovec_t* iov, int* flushing, int block_base_index = 0);
|
|
void flush_iovec(cached_piece_entry* pe, file::iovec_t const* iov, int const* flushing
|
|
, int num_blocks, storage_error& error);
|
|
void iovec_flushed(cached_piece_entry* pe
|
|
, int* flushing, int num_blocks, int block_offset
|
|
, storage_error const& error
|
|
, jobqueue_t& completed_jobs);
|
|
|
|
// assumes l is locked (the cache mutex).
|
|
// assumes pe->hash to be set.
|
|
// If there are new blocks in piece 'pe' that have not been
|
|
// hashed by the partial_hash object attached to this piece,
|
|
// the piece will
|
|
void kick_hasher(cached_piece_entry* pe, mutex::scoped_lock& l);
|
|
|
|
// flags to pass in to flush_cache()
|
|
enum flush_flags_t
|
|
{
|
|
// only flush read cache (this is cheap)
|
|
flush_read_cache = 1,
|
|
// flush read cache, and write cache
|
|
flush_write_cache = 2,
|
|
// flush read cache, delete write cache without flushing to disk
|
|
flush_delete_cache = 4,
|
|
// expect all pieces for the storage to have been
|
|
// cleared when flush_cache() returns. This is only
|
|
// used for asserts and only applies for fence jobs
|
|
flush_expect_clear = 8
|
|
};
|
|
void flush_cache(piece_manager* storage, boost::uint32_t flags, jobqueue_t& completed_jobs, mutex::scoped_lock& l);
|
|
void flush_expired_write_blocks(jobqueue_t& completed_jobs, mutex::scoped_lock& l);
|
|
void flush_piece(cached_piece_entry* pe, int flags, jobqueue_t& completed_jobs, mutex::scoped_lock& l);
|
|
|
|
int try_flush_hashed(cached_piece_entry* p, int cont_blocks, jobqueue_t& completed_jobs, mutex::scoped_lock& l);
|
|
|
|
void try_flush_write_blocks(int num, jobqueue_t& completed_jobs, mutex::scoped_lock& l);
|
|
|
|
// used to batch reclaiming of blocks to once per cycle
|
|
void commit_reclaimed_blocks();
|
|
|
|
void maybe_flush_write_blocks();
|
|
void execute_job(disk_io_job* j);
|
|
void immediate_execute();
|
|
void abort_jobs();
|
|
|
|
// this is a counter which is atomically incremented
|
|
// by each thread as it's started up, in order to
|
|
// assign a unique id to each thread
|
|
boost::atomic<int> m_num_threads;
|
|
|
|
// set to true once we start shutting down
|
|
boost::atomic<bool> m_abort;
|
|
|
|
// this is a counter of how many threads are currently running.
|
|
// it's used to identify the last thread still running while
|
|
// shutting down. This last thread is responsible for cleanup
|
|
boost::atomic<int> m_num_running_threads;
|
|
|
|
// the actual threads running disk jobs
|
|
std::vector<boost::shared_ptr<thread> > m_threads;
|
|
|
|
aux::session_settings m_settings;
|
|
|
|
// userdata pointer for the complete_job function, which
|
|
// is posted to the network thread when jobs complete
|
|
void* m_userdata;
|
|
|
|
// the last time we expired write blocks from the cache
|
|
time_point m_last_cache_expiry;
|
|
|
|
time_point m_last_file_check;
|
|
|
|
// LRU cache of open files
|
|
file_pool m_file_pool;
|
|
|
|
// disk cache
|
|
mutable mutex m_cache_mutex;
|
|
block_cache m_disk_cache;
|
|
|
|
// total number of blocks in use by both the read
|
|
// and the write cache. This is not supposed to
|
|
// exceed m_cache_size
|
|
|
|
counters& m_stats_counters;
|
|
|
|
// average read time for cache misses (in microseconds)
|
|
average_accumulator m_read_time;
|
|
|
|
// average write time (in microseconds)
|
|
average_accumulator m_write_time;
|
|
|
|
// average hash time (in microseconds)
|
|
average_accumulator m_hash_time;
|
|
|
|
// average time to serve a job (any job) in microseconds
|
|
average_accumulator m_job_time;
|
|
|
|
// this is the main thread io_service. Callbacks are
|
|
// posted on this in order to have them execute in
|
|
// the main thread.
|
|
io_service& m_ios;
|
|
|
|
// used to wake up the disk IO thread when there are new
|
|
// jobs on the job queue (m_queued_jobs)
|
|
condition_variable m_job_cond;
|
|
|
|
// mutex to protect the m_queued_jobs list
|
|
mutable mutex m_job_mutex;
|
|
|
|
// jobs queued for servicing
|
|
jobqueue_t m_queued_jobs;
|
|
|
|
// when using more than 2 threads, this is
|
|
// used for just hashing jobs, just for threads
|
|
// dedicated to do hashing
|
|
condition_variable m_hash_job_cond;
|
|
jobqueue_t m_queued_hash_jobs;
|
|
|
|
// used to rate limit disk performance warnings
|
|
time_point m_last_disk_aio_performance_warning;
|
|
|
|
// jobs that are completed are put on this queue
|
|
// whenever the queue size grows from 0 to 1
|
|
// a message is posted to the network thread, which
|
|
// will then drain the queue and execute the jobs'
|
|
// handler functions
|
|
mutex m_completed_jobs_mutex;
|
|
jobqueue_t m_completed_jobs;
|
|
|
|
// these are blocks that have been returned by the main thread
|
|
// but they haven't been freed yet. This is used to batch
|
|
// reclaiming of blocks, to only need one mutex lock per cycle
|
|
std::vector<block_cache_reference> m_blocks_to_reclaim;
|
|
|
|
// when this is true, there is an outstanding message in the
|
|
// message queue that will reclaim all blocks in
|
|
// m_blocks_to_reclaim, there's no need to send another one
|
|
bool m_outstanding_reclaim_message;
|
|
#if TORRENT_USE_ASSERTS
|
|
int m_magic;
|
|
#endif
|
|
};
|
|
}
|
|
|
|
#endif
|
|
|