made torrents not wanting more peers whene they're shutting down. Closes out all connections in the connection queue explicitly when session is shutting down

include/libtorrent/connection_queue.hpp

@@ -63,6 +63,7 @@ public:
 	void limit(int limit);
 	int limit() const;
 	void close();
+	int size() const { return m_queue.size(); }
 
 #ifndef NDEBUG
 	void check_invariant() const;
@@ -93,6 +94,7 @@ private:
 	int m_next_ticket;
 	int m_num_connecting;
 	int m_half_open_limit;
+	bool m_abort;
 
 	deadline_timer m_timer;
 

src/connection_queue.cpp

@@ -42,6 +42,7 @@ namespace libtorrent
 	connection_queue::connection_queue(io_service& ios): m_next_ticket(0)
 		, m_num_connecting(0)
 		, m_half_open_limit(0)
+		, m_abort(false)
 		, m_timer(ios)
 #ifndef NDEBUG
 		, m_in_timeout_function(false)
@@ -114,7 +115,24 @@ namespace libtorrent
 	void connection_queue::close()
 	{
 		error_code ec;
+		mutex_t::scoped_lock l(m_mutex);
 		m_timer.cancel(ec);
+		m_abort = true;
+
+		// make a copy of the list to go through, so
+		// that connections removing themseleves won't
+		// interfere with the iteration
+		std::list<entry> closing_entries = m_queue;
+
+		// we don't want to call the timeout callback while we're locked
+		// since that is a recepie for dead-locks
+		l.unlock();
+
+		for (std::list<entry>::iterator i = closing_entries.begin()
+			, end(closing_entries.end()); i != end; ++i)
+		{
+			try { i->on_timeout(); } catch (std::exception&) {}
+		}
 	}
 
 	void connection_queue::limit(int limit)
@@ -148,6 +166,7 @@ namespace libtorrent
 #ifdef TORRENT_CONNECTION_LOGGING
 		m_log << log_time() << " " << free_slots() << std::endl;
 #endif
+		if (m_abort) return;
 
 		if (m_num_connecting >= m_half_open_limit
 			&& m_half_open_limit > 0) return;

src/session_impl.cpp

@@ -498,6 +498,12 @@ namespace aux {
 #if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
 		(*m_logger) << time_now_string() << " aborting all connections (" << m_connections.size() << ")\n";
 #endif
+		m_half_open.close();
+
+#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
+		(*m_logger) << time_now_string() << " connection queue: " << m_half_open.size() << std::endl;
+#endif
+
 		// abort all connections
 		while (!m_connections.empty())
 		{
@@ -508,10 +514,14 @@ namespace aux {
 			TORRENT_ASSERT(conn == int(m_connections.size()) + 1);
 		}
 
+#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
+		(*m_logger) << time_now_string() << " connection queue: " << m_half_open.size() << std::endl;
+#endif
+		TORRENT_ASSERT(m_half_open.size() == 0);
+
 #if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
 		(*m_logger) << time_now_string() << " shutting down connection queue\n";
 #endif
-		m_half_open.close();
 
 		m_download_channel.close();
 		m_upload_channel.close();
@@ -2270,6 +2280,7 @@ namespace aux {
 		(*m_logger) << time_now_string() << "\n\n *** shutting down session *** \n\n";
 #endif
 		abort();
+		TORRENT_ASSERT(m_connections.empty());
 
 #ifndef TORRENT_DISABLE_GEO_IP
 		if (m_asnum_db) GeoIP_delete(m_asnum_db);
@@ -2292,6 +2303,7 @@ namespace aux {
 #if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
 		(*m_logger) << time_now_string() << " shutdown complete!\n";
 #endif
+		TORRENT_ASSERT(m_connections.empty());
 	}
 
 	void session_impl::set_max_uploads(int limit)

src/torrent.cpp

@@ -3126,7 +3126,8 @@ namespace libtorrent
 			&& m_state != torrent_status::checking_files
 			&& (m_state != torrent_status::queued_for_checking
 				|| !valid_metadata())
-			&& m_policy.num_connect_candidates() > 0;
+			&& m_policy.num_connect_candidates() > 0
+			&& !m_abort;
 	}
 
 	void torrent::disconnect_all()