fixed a bug caused by file_pool being destructed before torrents, and torrents using the file pool in their destructors

include/libtorrent/aux_/session_impl.hpp

@@ -312,6 +312,14 @@ namespace libtorrent
 			io_service m_io_service;
 			asio::strand m_strand;
 
+			// the file pool that all storages in this session's
+			// torrents uses. It sets a limit on the number of
+			// open files by this session.
+			// file pool must be destructed after the torrents
+			// since they will still have references to it
+			// when they are destructed.
+			file_pool m_files;
+
 			// the bandwidth manager is responsible for
 			// handing out bandwidth to connections that
 			// asks for it, it can also throttle the
@@ -391,11 +399,6 @@ namespace libtorrent
 			// NAT or not.
 			bool m_incoming_connection;
 			
-			// the file pool that all storages in this session's
-			// torrents uses. It sets a limit on the number of
-			// open files by this session.
-			file_pool m_files;
-
 			void second_tick(asio::error_code const& e);
 			ptime m_last_tick;
 

src/session_impl.cpp

@@ -477,6 +477,7 @@ namespace libtorrent { namespace detail
 		, fingerprint const& cl_fprint
 		, char const* listen_interface)
 		: m_strand(m_io_service)
+		, m_files(40)
 		, m_dl_bandwidth_manager(m_io_service, peer_connection::download_channel)
 		, m_ul_bandwidth_manager(m_io_service, peer_connection::upload_channel)
 		, m_tracker_manager(m_settings, m_tracker_proxy)
@@ -488,7 +489,6 @@ namespace libtorrent { namespace detail
 		, m_max_uploads(-1)
 		, m_max_connections(-1)
 		, m_incoming_connection(false)
-		, m_files(40)
 		, m_last_tick(time_now())
 #ifndef TORRENT_DISABLE_DHT
 		, m_dht_same_port(true)