fixed crashing bug when removing torrents while checking

ChangeLog

@@ -1,3 +1,4 @@
+	* fixed crasing bug when closing while checking a torrent
 	* fixed bug causing a crash with a torrent with piece length 0
 	* added an extension to the DHT network protocol to support the
 	  exchange of nodes with IPv6 addresses.

include/libtorrent/session.hpp

@@ -163,6 +163,10 @@ namespace libtorrent
 			piece_checker_data* find_torrent(const sha1_hash& info_hash);
 			void remove_torrent(sha1_hash const& info_hash);
 
+#ifndef NDEBUG
+			void check_invariant() const;
+#endif
+
 			// when the files has been checked
 			// the torrent is added to the session
 			session_impl& m_ses;

src/session.cpp

@@ -112,6 +112,8 @@ namespace libtorrent { namespace detail
 				{
 					boost::mutex::scoped_lock l(m_mutex);
 
+					INVARIANT_CHECK;
+
 					// if the job queue is empty and
 					// we shouldn't abort
 					// wait for a signal
@@ -160,7 +162,8 @@ namespace libtorrent { namespace detail
 				if (t)
 				{
 					std::string error_msg;
-					t->parse_resume_data(t->resume_data, t->torrent_ptr->torrent_file(), error_msg);
+					t->parse_resume_data(t->resume_data, t->torrent_ptr->torrent_file()
+						, error_msg);
 
 					if (!error_msg.empty() && m_ses.m_alerts.should_post(alert::warning))
 					{
@@ -185,6 +188,7 @@ namespace libtorrent { namespace detail
 						// lock the session to add the new torrent
 						session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
 						mutex::scoped_lock l2(m_mutex);
+						INVARIANT_CHECK;
 
 						assert(m_torrents.front() == t);
 
@@ -276,6 +280,9 @@ namespace libtorrent { namespace detail
 
 				{
 					mutex::scoped_lock l(m_mutex);
+
+					INVARIANT_CHECK;
+
 					processing->progress = progress;
 					if (processing->abort)
 					{
@@ -300,6 +307,8 @@ namespace libtorrent { namespace detail
 					session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
 					mutex::scoped_lock l2(m_mutex);
 
+					INVARIANT_CHECK;
+
 					assert(!m_processing.empty());
 					assert(m_processing.front() == processing);
 
@@ -388,6 +397,7 @@ namespace libtorrent { namespace detail
 
 	detail::piece_checker_data* checker_impl::find_torrent(sha1_hash const& info_hash)
 	{
+		INVARIANT_CHECK;
 		for (std::deque<boost::shared_ptr<piece_checker_data> >::iterator i
 			= m_torrents.begin(); i != m_torrents.end(); ++i)
 		{
@@ -405,6 +415,7 @@ namespace libtorrent { namespace detail
 
 	void checker_impl::remove_torrent(sha1_hash const& info_hash)
 	{
+		INVARIANT_CHECK;
 		for (std::deque<boost::shared_ptr<piece_checker_data> >::iterator i
 			= m_torrents.begin(); i != m_torrents.end(); ++i)
 		{
@@ -421,7 +432,7 @@ namespace libtorrent { namespace detail
 			if ((*i)->info_hash == info_hash)
 			{
 				assert((*i)->processing == false);
-				m_torrents.erase(i);
+				m_processing.erase(i);
 				return;
 			}
 		}
@@ -429,6 +440,24 @@ namespace libtorrent { namespace detail
 		assert(false);
 	}
 
+#ifndef NDEBUG
+	void checker_impl::check_invariant() const
+	{
+		for (std::deque<boost::shared_ptr<piece_checker_data> >::const_iterator i
+			= m_torrents.begin(); i != m_torrents.end(); ++i)
+		{
+			assert(*i);
+			assert((*i)->torrent_ptr);
+		}
+		for (std::deque<boost::shared_ptr<piece_checker_data> >::const_iterator i
+			= m_processing.begin(); i != m_processing.end(); ++i)
+		{
+			assert(*i);
+			assert((*i)->torrent_ptr);
+		}
+	}
+#endif
+
 	session_impl::session_impl(
 		std::pair<int, int> listen_port_range
 		, fingerprint const& cl_fprint

src/torrent.cpp

@@ -957,7 +957,7 @@ namespace libtorrent
 		req.downloaded = m_stat.total_payload_download();
 		req.uploaded = m_stat.total_payload_upload();
 		req.left = bytes_left();
-		if (req.left == -1) req.left = 1000;
+		if (req.left == -1) req.left = 16*1024;
 		req.event = m_event;
 
 		if (m_event != tracker_request::stopped)