remove unused disk allocation code

include/libtorrent/aux_/session_impl.hpp

@@ -563,8 +563,6 @@ namespace libtorrent
 			char* allocate_disk_buffer(bool& exceeded
 				, boost::shared_ptr<disk_observer> o
 				, char const* category) TORRENT_OVERRIDE;
-			char* async_allocate_disk_buffer(char const* category
-				, boost::function<void(char*)> const& handler) TORRENT_OVERRIDE;
 			void reclaim_block(block_cache_reference ref) TORRENT_OVERRIDE;
 
 			bool exceeded_cache_use() const

include/libtorrent/disk_buffer_holder.hpp

@@ -58,8 +58,6 @@ namespace libtorrent
 		virtual char* allocate_disk_buffer(bool& exceeded
 			, boost::shared_ptr<disk_observer> o
 			, char const* category) = 0;
-		virtual char* async_allocate_disk_buffer(char const* category
-			, boost::function<void(char*)> const& handler) = 0;
 	protected:
 		~buffer_allocator_interface() {}
 	};

include/libtorrent/disk_buffer_pool.hpp

@@ -75,11 +75,6 @@ namespace libtorrent
 		bool is_disk_buffer(char* buffer) const;
 #endif
 
-		// tries to allocate a disk buffer. If the cache is full, this function will
-		// return NULL and call the disk_observer once a buffer becomes available
-		char* async_allocate_buffer(char const* category
-			, boost::function<void(char*)> const& handler);
-
 		char* allocate_buffer(char const* category);
 		char* allocate_buffer(bool& exceeded, boost::shared_ptr<disk_observer> o
 			, char const* category);
@@ -134,12 +129,8 @@ namespace libtorrent
 		// adding up callbacks to this queue. Once the number
 		// of buffers in use drops below the low watermark,
 		// we start calling these functions back
-		// TODO: try to remove the observers, only using the async_allocate handlers
 		std::vector<boost::weak_ptr<disk_observer> > m_observers;
 
-		// these handlers are executed when a new buffer is available
-		std::vector<handler_t> m_handlers;
-
 		// callback used to tell the cache it needs to free up some blocks
 		boost::function<void()> m_trigger_cache_trim;
 

include/libtorrent/disk_io_thread.hpp

@@ -362,8 +362,7 @@ namespace libtorrent
 
 		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);
+			, char const* category) TORRENT_OVERRIDE;
 
 		bool exceeded_cache_use() const
 		{ return m_disk_cache.exceeded_max_size(); }

src/disk_buffer_pool.cpp

@@ -67,17 +67,8 @@ namespace libtorrent
 	namespace {
 
 	// this is posted to the network thread
-	void watermark_callback(std::vector<boost::weak_ptr<disk_observer> >* cbs
-		, std::vector<disk_buffer_pool::handler_t>* handlers)
+	void watermark_callback(std::vector<boost::weak_ptr<disk_observer> >* cbs)
 	{
-		if (handlers)
-		{
-			for (std::vector<disk_buffer_pool::handler_t>::iterator i = handlers->begin()
-				, end(handlers->end()); i != end; ++i)
-				i->callback(i->buffer);
-			delete handlers;
-		}
-
 		if (cbs != NULL)
 		{
 			for (std::vector<boost::weak_ptr<disk_observer> >::iterator i = cbs->begin()
@@ -147,7 +138,7 @@ namespace libtorrent
 		mutex::scoped_lock l(m_pool_mutex);
 
 		if (m_exceeded_max_size)
-			ret = m_in_use - (std::min)(m_low_watermark, int(m_max_use - (m_observers.size() + m_handlers.size())*2));
+			ret = m_in_use - (std::min)(m_low_watermark, int(m_max_use - m_observers.size()*2));
 
 		if (m_in_use + num_needed > m_max_use)
 			ret = (std::max)(ret, int(m_in_use + num_needed - m_max_use));
@@ -169,49 +160,11 @@ namespace libtorrent
 
 		m_exceeded_max_size = false;
 
-		// if slice is non-NULL, only some of the handlers got a buffer
-		// back, and the slice should be posted back to the network thread
-		std::vector<handler_t>* slice = NULL;
-
-		for (std::vector<handler_t>::iterator i = m_handlers.begin()
-			, end(m_handlers.end()); i != end; ++i)
-		{
-			i->buffer = allocate_buffer_impl(l, i->category);
-			if (!m_exceeded_max_size || i == end - 1) continue;
-
-			// only some of the handlers got buffers. We need to slice the vector
-			slice = new std::vector<handler_t>();
-			slice->insert(slice->end(), m_handlers.begin(), i + 1);
-			m_handlers.erase(m_handlers.begin(), i + 1);
-			break;
-		}
-
-		if (slice != NULL)
-		{
-			l.unlock();
-			m_ios.post(boost::bind(&watermark_callback
-				, static_cast<std::vector<boost::weak_ptr<disk_observer> >*>(NULL)
-				, slice));
-			return;
-		}
-
-		std::vector<handler_t>* handlers = new std::vector<handler_t>();
-		handlers->swap(m_handlers);
-
-		if (m_exceeded_max_size)
-		{
-			l.unlock();
-			m_ios.post(boost::bind(&watermark_callback
-				, static_cast<std::vector<boost::weak_ptr<disk_observer> >*>(NULL)
-				, handlers));
-			return;
-		}
-
 		std::vector<boost::weak_ptr<disk_observer> >* cbs
 			= new std::vector<boost::weak_ptr<disk_observer> >();
 		m_observers.swap(*cbs);
 		l.unlock();
-		m_ios.post(boost::bind(&watermark_callback, cbs, handlers));
+		m_ios.post(boost::bind(&watermark_callback, cbs));
 	}
 
 #if TORRENT_USE_ASSERTS
@@ -251,25 +204,6 @@ namespace libtorrent
 	}
 #endif
 
-	char* disk_buffer_pool::async_allocate_buffer(char const* category
-		, boost::function<void(char*)> const& handler)
-	{
-		mutex::scoped_lock l(m_pool_mutex);
-		if (m_exceeded_max_size)
-		{
-			m_handlers.push_back(handler_t());
-			handler_t& h = m_handlers.back();
-			h.category = category;
-			h.callback = handler;
-			h.buffer = NULL;
-			return NULL;
-		}
-
-		char* ret = allocate_buffer_impl(l, category);
-
-		return ret;
-	}
-
 	char* disk_buffer_pool::allocate_buffer(char const* category)
 	{
 		mutex::scoped_lock l(m_pool_mutex);

src/disk_io_thread.cpp

@@ -261,10 +261,6 @@ namespace libtorrent
 		}
 	}
 
-	char* disk_io_thread::async_allocate_disk_buffer(char const* category
-		, boost::function<void(char*)> const& handler)
-	{ return m_disk_cache.async_allocate_buffer(category, handler); }
-
 	void disk_io_thread::reclaim_block(block_cache_reference ref)
 	{
 		TORRENT_ASSERT(m_magic == 0x1337);

src/peer_connection.cpp

@@ -6289,28 +6289,6 @@ namespace libtorrent
 			// cache space right now
 
 			if (m_channel_state[download_channel] & peer_info::bw_disk) return false;
-/*
-			// if we already have a disk buffer, we might as well use it
-			// if contiguous recv buffer is true, don't apply this logic, but
-			// actually wait until we try to allocate a buffer and exceed the limit
-			if (m_disk_recv_buffer == NULL
-				&& !m_settings.get_bool(settings_pack::contiguous_recv_buffer))
-			{
-				m_disk_recv_buffer.reset(m_ses.async_allocate_disk_buffer("receive buffer",
-					boost::bind(&peer_connection::on_allocate_disk_buffer, self(), _1, #error buffer_size)));
-
-				if (m_disk_recv_buffer == NULL)
-				{
-					m_counters.inc_stats_counter(counters::num_peers_down_disk);
-					const_cast<peer_connection*>(this)->m_channel_state[download_channel] |= peer_info::bw_disk;
-
-#ifndef TORRENT_DISABLE_LOGGING
-					peer_log(peer_log_alert::info, "DISK", "exceeded disk buffer watermark");
-#endif
-					return false;
-				}
-			}
-*/
 		}
 
 		return !m_connecting && !m_disconnecting;

src/session_impl.cpp

@@ -6924,12 +6924,6 @@ retry:
 		return m_disk_thread.allocate_disk_buffer(category);
 	}
 
-	char* session_impl::async_allocate_disk_buffer(char const* category
-		, boost::function<void(char*)> const& handler)
-	{
-		return m_disk_thread.async_allocate_disk_buffer(category, handler);
-	}
-
 	void session_impl::free_disk_buffer(char* buf)
 	{
 		m_disk_thread.free_disk_buffer(buf);