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modernize disk_buffer_holder to be move-only (#824) 

modernize disk_buffer_holder to be move-only
This commit is contained in:
Arvid Norberg 2016-06-16 08:24:41 -04:00 committed by GitHub
parent 2fed4103f8
commit 4d927f4029
13 changed files with 97 additions and 79 deletions
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4
include/libtorrent/aux_/session_impl.hpp
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@ -576,8 +576,8 @@ namespace libtorrent
// implements buffer_allocator_interface
void free_disk_buffer(char* buf) override;
char* allocate_disk_buffer(char const* category) override;
char* allocate_disk_buffer(bool& exceeded
disk_buffer_holder allocate_disk_buffer(char const* category) override;
disk_buffer_holder allocate_disk_buffer(bool& exceeded
, boost::shared_ptr<disk_observer> o
, char const* category) override;
void reclaim_block(block_cache_reference ref) override;

2
include/libtorrent/bt_peer_connection.hpp
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@ -219,7 +219,7 @@ namespace libtorrent
void write_bitfield() override;
void write_have(int index) override;
void write_dont_have(int index) override;
void write_piece(peer_request const& r, disk_buffer_holder& buffer) override;
void write_piece(peer_request const& r, disk_buffer_holder buffer) override;
void write_keepalive() override;
void write_handshake();
#ifndef TORRENT_DISABLE_EXTENSIONS

34
include/libtorrent/disk_buffer_holder.hpp
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@ -49,13 +49,14 @@ namespace libtorrent
{
struct disk_io_thread;
struct disk_observer;
struct disk_buffer_holder;
struct TORRENT_EXTRA_EXPORT buffer_allocator_interface
{
virtual char* allocate_disk_buffer(char const* category) = 0;
virtual void free_disk_buffer(char* b) = 0;
virtual void reclaim_block(block_cache_reference ref) = 0;
virtual char* allocate_disk_buffer(bool& exceeded
virtual disk_buffer_holder allocate_disk_buffer(char const* category) = 0;
virtual disk_buffer_holder allocate_disk_buffer(bool& exceeded
, boost::shared_ptr<disk_observer> o
, char const* category) = 0;
protected:
@ -66,15 +67,19 @@ namespace libtorrent
// when it's destructed, unless it's released. ``release`` returns the disk
// buffer and transfers ownership and responsibility to free it to the caller.
//
// A disk buffer is freed by passing it to ``session_impl::free_disk_buffer()``.
//
// ``get()`` returns the pointer without transferring responsibility. If
// this buffer has been released, ``buffer()`` will return 0.
// ``get()`` returns the pointer without transferring ownership. If
// this buffer has been released, ``get()`` will return nullptr.
struct TORRENT_EXPORT disk_buffer_holder
{
// internal
disk_buffer_holder(buffer_allocator_interface& alloc, char* buf);
disk_buffer_holder& operator=(disk_buffer_holder&&);
disk_buffer_holder(disk_buffer_holder&&);
disk_buffer_holder& operator=(disk_buffer_holder const&) = delete;
disk_buffer_holder(disk_buffer_holder const&) = delete;
// construct a buffer holder that will free the held buffer
// using a disk buffer pool directly (there's only one
// disk_buffer_pool per session)
@ -82,7 +87,7 @@ namespace libtorrent
// frees any unreleased disk buffer held by this object
~disk_buffer_holder();
// return the held disk buffer and clear it from the
// holder. The responsibility to free it is passed on
// to the caller
@ -100,25 +105,20 @@ namespace libtorrent
// swap pointers of two disk buffer holders.
void swap(disk_buffer_holder& h)
{
TORRENT_ASSERT(&h.m_allocator == &m_allocator);
TORRENT_ASSERT(h.m_allocator == m_allocator);
std::swap(h.m_buf, m_buf);
std::swap(h.m_ref, m_ref);
}
block_cache_reference ref() const { return m_ref; }
typedef char* (disk_buffer_holder::*unspecified_bool_type)();
// internal
operator unspecified_bool_type() const
{ return m_buf == 0? 0: &disk_buffer_holder::release; }
// implicitly convertible to true if the object is currently holding a
// buffer
explicit operator bool() const { return m_buf != nullptr; }
private:
// non-copyable
disk_buffer_holder& operator=(disk_buffer_holder const&);
disk_buffer_holder(disk_buffer_holder const*);
buffer_allocator_interface& m_allocator;
buffer_allocator_interface* m_allocator;
char* m_buf;
block_cache_reference m_ref;
};

2
include/libtorrent/disk_interface.hpp
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@ -56,7 +56,7 @@ namespace libtorrent
, boost::function<void(disk_io_job const*)> const& handler, void* requester
, int flags = 0) = 0;
virtual void async_write(piece_manager* storage, peer_request const& r
, disk_buffer_holder& buffer
, disk_buffer_holder buffer
, boost::function<void(disk_io_job const*)> const& handler
, int flags = 0) = 0;
virtual void async_hash(piece_manager* storage, int piece, int flags

6
include/libtorrent/disk_io_thread.hpp
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@ -303,7 +303,7 @@ namespace libtorrent
, boost::function<void(disk_io_job const*)> const& handler, void* requester
, int flags = 0) override;
void async_write(piece_manager* storage, peer_request const& r
, disk_buffer_holder& buffer
, disk_buffer_holder buffer
, boost::function<void(disk_io_job const*)> const& handler
, int flags = 0) override;
void async_hash(piece_manager* storage, int piece, int flags
@ -354,14 +354,14 @@ namespace libtorrent
// implements buffer_allocator_interface
void reclaim_block(block_cache_reference ref) override;
void free_disk_buffer(char* buf) override { m_disk_cache.free_buffer(buf); }
char* allocate_disk_buffer(char const* category) override
disk_buffer_holder allocate_disk_buffer(char const* category) override
{
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
disk_buffer_holder allocate_disk_buffer(bool& exceeded, boost::shared_ptr<disk_observer> o
, char const* category) override;
bool exceeded_cache_use() const

4
include/libtorrent/peer_connection.hpp
View File

@ -574,7 +574,7 @@ namespace libtorrent
void incoming_dont_have(int piece_index);
void incoming_bitfield(bitfield const& bits);
void incoming_request(peer_request const& r);
void incoming_piece(peer_request const& p, disk_buffer_holder& data);
void incoming_piece(peer_request const& p, disk_buffer_holder data);
void incoming_piece(peer_request const& p, char const* data);
void incoming_piece_fragment(int bytes);
void start_receive_piece(peer_request const& r);
@ -730,7 +730,7 @@ namespace libtorrent
virtual void write_have(int index) = 0;
virtual void write_dont_have(int index) = 0;
virtual void write_keepalive() = 0;
virtual void write_piece(peer_request const& r, disk_buffer_holder& buffer) = 0;
virtual void write_piece(peer_request const& r, disk_buffer_holder buffer) = 0;
virtual void write_suggest(int piece) = 0;
virtual void write_bitfield() = 0;

2
include/libtorrent/web_connection_base.hpp
View File

@ -108,7 +108,7 @@ namespace libtorrent
void write_cancel(peer_request const&) {}
void write_have(int) {}
void write_dont_have(int) {}
void write_piece(peer_request const&, disk_buffer_holder&)
void write_piece(peer_request const&, disk_buffer_holder)
{ TORRENT_ASSERT_FAIL(); }
void write_keepalive() {}
void on_connected();

4
src/bt_peer_connection.cpp
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@ -2472,7 +2472,7 @@ namespace libtorrent
} // anonymous namespace
void bt_peer_connection::write_piece(peer_request const& r, disk_buffer_holder& buffer)
void bt_peer_connection::write_piece(peer_request const& r, disk_buffer_holder buffer)
{
INVARIANT_CHECK;
@ -2532,7 +2532,7 @@ namespace libtorrent
send_buffer(msg, 13);
}
if (buffer.ref().storage == 0)
if (buffer.ref().storage == nullptr)
{
append_send_buffer(buffer.get(), r.length
, &buffer_free_disk_buf, &m_allocator);

49
src/disk_buffer_holder.cpp
View File

@ -38,33 +38,48 @@ namespace libtorrent
{
disk_buffer_holder::disk_buffer_holder(buffer_allocator_interface& alloc, char* buf)
: m_allocator(alloc), m_buf(buf)
: m_allocator(&alloc), m_buf(buf)
{
m_ref.storage = 0;
m_ref.storage = nullptr;
m_ref.piece = -1;
m_ref.block = -1;
}
disk_buffer_holder::disk_buffer_holder(buffer_allocator_interface& alloc, disk_io_job const& j)
: m_allocator(alloc), m_buf(j.buffer.disk_block), m_ref(j.d.io.ref)
disk_buffer_holder& disk_buffer_holder::operator=(disk_buffer_holder&& h)
{
TORRENT_ASSERT(m_ref.storage == 0 || m_ref.piece >= 0);
TORRENT_ASSERT(m_ref.storage == 0 || m_ref.block >= 0);
TORRENT_ASSERT(m_ref.storage == 0 || m_ref.piece < static_cast<piece_manager*>(m_ref.storage)->files()->num_pieces());
TORRENT_ASSERT(m_ref.storage == 0 || m_ref.block <= static_cast<piece_manager*>(m_ref.storage)->files()->piece_length() / 0x4000);
disk_buffer_holder(std::move(h)).swap(*this);
return *this;
}
disk_buffer_holder::disk_buffer_holder(disk_buffer_holder&& h)
: m_allocator(h.m_allocator), m_buf(h.m_buf), m_ref(h.m_ref)
{
// we own this buffer now
h.release();
}
disk_buffer_holder::disk_buffer_holder(buffer_allocator_interface& alloc, disk_io_job const& j)
: m_allocator(&alloc), m_buf(j.buffer.disk_block), m_ref(j.d.io.ref)
{
TORRENT_ASSERT(m_ref.storage == nullptr || m_ref.piece >= 0);
TORRENT_ASSERT(m_ref.storage == nullptr || m_ref.block >= 0);
TORRENT_ASSERT(m_ref.storage == nullptr
|| m_ref.piece < static_cast<piece_manager*>(m_ref.storage)->files()->num_pieces());
TORRENT_ASSERT(m_ref.storage == nullptr
|| m_ref.block <= static_cast<piece_manager*>(m_ref.storage)->files()->piece_length() / 0x4000);
TORRENT_ASSERT(j.action != disk_io_job::rename_file);
TORRENT_ASSERT(j.action != disk_io_job::move_storage);
}
void disk_buffer_holder::reset(disk_io_job const& j)
{
if (m_ref.storage) m_allocator.reclaim_block(m_ref);
else if (m_buf) m_allocator.free_disk_buffer(m_buf);
if (m_ref.storage) m_allocator->reclaim_block(m_ref);
else if (m_buf) m_allocator->free_disk_buffer(m_buf);
m_buf = j.buffer.disk_block;
m_ref = j.d.io.ref;
TORRENT_ASSERT(m_ref.piece >= 0);
TORRENT_ASSERT(m_ref.storage != 0);
TORRENT_ASSERT(m_ref.storage != nullptr);
TORRENT_ASSERT(m_ref.block >= 0);
TORRENT_ASSERT(m_ref.piece < static_cast<piece_manager*>(m_ref.storage)->files()->num_pieces());
TORRENT_ASSERT(m_ref.block <= static_cast<piece_manager*>(m_ref.storage)->files()->piece_length() / 0x4000);
@ -72,19 +87,19 @@ namespace libtorrent
TORRENT_ASSERT(j.action != disk_io_job::move_storage);
}
void disk_buffer_holder::reset(char* buf)
void disk_buffer_holder::reset(char* const buf)
{
if (m_ref.storage) m_allocator.reclaim_block(m_ref);
else if (m_buf) m_allocator.free_disk_buffer(m_buf);
if (m_ref.storage) m_allocator->reclaim_block(m_ref);
else if (m_buf) m_allocator->free_disk_buffer(m_buf);
m_buf = buf;
m_ref.storage = 0;
m_ref.storage = nullptr;
}
char* disk_buffer_holder::release()
{
char* ret = m_buf;
m_buf = 0;
m_ref.storage = 0;
m_buf = nullptr;
m_ref.storage = nullptr;
return ret;
}

40
src/disk_io_thread.cpp
View File

@ -1590,7 +1590,7 @@ namespace libtorrent
}
void disk_io_thread::async_write(piece_manager* storage, peer_request const& r
, disk_buffer_holder& buffer
, disk_buffer_holder buffer
, boost::function<void(disk_io_job const*)> const& handler
, int flags)
{
@ -1672,24 +1672,28 @@ namespace libtorrent
// if the buffer was successfully added to the cache
// our holder should no longer own it
if (dpe) buffer.release();
if (dpe && dpe->outstanding_flush == 0)
if (dpe)
{
dpe->outstanding_flush = 1;
l.unlock();
buffer.release();
// the block and write job were successfully inserted
// into the cache. Now, see if we should trigger a flush
j = allocate_job(disk_io_job::flush_hashed);
j->storage = storage->shared_from_this();
j->piece = r.piece;
j->flags = flags;
add_job(j);
if (dpe->outstanding_flush == 0)
{
dpe->outstanding_flush = 1;
l.unlock();
// the block and write job were successfully inserted
// into the cache. Now, see if we should trigger a flush
j = allocate_job(disk_io_job::flush_hashed);
j->storage = storage->shared_from_this();
j->piece = r.piece;
j->flags = flags;
add_job(j);
}
// if we added the block (regardless of whether we also
// issued a flush job or not), we're done.
return;
}
// if we added the block (regardless of whether we also
// issued a flush job or not), we're done.
if (dpe) return;
l.unlock();
add_job(j);
@ -3330,12 +3334,12 @@ namespace libtorrent
submit_jobs();
}
char* disk_io_thread::allocate_disk_buffer(bool& exceeded
disk_buffer_holder disk_io_thread::allocate_disk_buffer(bool& exceeded
, boost::shared_ptr<disk_observer> o
, char const* category)
{
char* ret = m_disk_cache.allocate_buffer(exceeded, o, category);
return ret;
return disk_buffer_holder(*this, ret);
}
void disk_io_thread::add_completed_job(disk_io_job* j)

16
src/peer_connection.cpp
View File

@ -2611,9 +2611,10 @@ namespace libtorrent
{
TORRENT_ASSERT(is_single_thread());
bool exceeded = false;
char* buffer = m_allocator.allocate_disk_buffer(exceeded, self(), "receive buffer");
disk_buffer_holder buffer
= m_allocator.allocate_disk_buffer(exceeded, self(), "receive buffer");
if (buffer == 0)
if (!buffer)
{
disconnect(errors::no_memory, op_alloc_recvbuf);
return;
@ -2635,12 +2636,11 @@ namespace libtorrent
#endif
}
disk_buffer_holder holder(m_allocator, buffer);
std::memcpy(buffer, data, p.length);
incoming_piece(p, holder);
std::memcpy(buffer.get(), data, p.length);
incoming_piece(p, std::move(buffer));
}
void peer_connection::incoming_piece(peer_request const& p, disk_buffer_holder& data)
void peer_connection::incoming_piece(peer_request const& p, disk_buffer_holder data)
{
TORRENT_ASSERT(is_single_thread());
INVARIANT_CHECK;
@ -2849,7 +2849,7 @@ namespace libtorrent
return;
}
t->inc_refcount("async_write");
m_disk_thread.async_write(&t->storage(), p, data
m_disk_thread.async_write(&t->storage(), p, std::move(data)
, std::bind(&peer_connection::on_disk_write_complete
, self(), _1, p, t));
@ -5359,7 +5359,7 @@ namespace libtorrent
{
t->add_suggest_piece(r.piece);
}
write_piece(r, buffer);
write_piece(r, std::move(buffer));
}
void peer_connection::assign_bandwidth(int channel, int amount)

4
src/session_impl.cpp
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@ -6675,7 +6675,7 @@ namespace aux {
m_disk_thread.reclaim_block(ref);
}
char* session_impl::allocate_disk_buffer(char const* category)
disk_buffer_holder session_impl::allocate_disk_buffer(char const* category)
{
return m_disk_thread.allocate_disk_buffer(category);
}
@ -6685,7 +6685,7 @@ namespace aux {
m_disk_thread.free_disk_buffer(buf);
}
char* session_impl::allocate_disk_buffer(bool& exceeded
disk_buffer_holder session_impl::allocate_disk_buffer(bool& exceeded
, boost::shared_ptr<disk_observer> o
, char const* category)
{

9
src/torrent.cpp
View File

@ -1299,15 +1299,14 @@ namespace libtorrent
continue;
p.length = (std::min)(piece_size - p.start, int(block_size()));
char* buffer = m_ses.allocate_disk_buffer("add piece");
disk_buffer_holder buffer = m_ses.allocate_disk_buffer("add piece");
// out of memory
if (buffer == 0)
if (!buffer)
{
picker().dec_refcount(piece, 0);
return;
}
disk_buffer_holder holder(m_ses, buffer);
std::memcpy(buffer, data + p.start, p.length);
std::memcpy(buffer.get(), data + p.start, p.length);
if (!need_loaded())
{
@ -1316,7 +1315,7 @@ namespace libtorrent
return;
}
inc_refcount("add_piece");
m_ses.disk_thread().async_write(&storage(), p, holder
m_ses.disk_thread().async_write(&storage(), p, std::move(buffer)
, std::bind(&torrent::on_disk_write_complete
, shared_from_this(), _1, p));
piece_block block(piece, i);