fix potential infinite loop in request_time_critical_pieces

ChangeLog

@@ -88,6 +88,7 @@
 	  incoming connection
 	* added more detailed instrumentation of the disk I/O thread
 
+	* fix for set_piece_deadline
 	* add reset_piece_deadline function
 	* fix merkle tree torrent assert
 

src/peer_connection.cpp

@@ -2745,6 +2745,10 @@ namespace libtorrent
 		if ((int)m_download_queue.size() + (int)m_request_queue.size()
 			> m_desired_queue_size * 2) return false;
 		if (on_parole()) return false; 
+		if (m_disconnecting) return false;
+		boost::shared_ptr<torrent> t = m_torrent.lock();
+		TORRENT_ASSERT(t);
+		if (t->upload_mode()) return false;
 		return true;
 	}
 

src/torrent.cpp

@@ -7037,6 +7037,8 @@ namespace libtorrent
 		for (std::list<time_critical_piece>::iterator i = m_time_critical_pieces.begin()
 			, end(m_time_critical_pieces.end()); i != end; ++i)
 		{
+			if (peers.empty()) break;
+
 			if (i != m_time_critical_pieces.begin() && i->deadline > now
 				+ milliseconds(m_average_piece_time + m_piece_time_deviation * 4))
 			{
@@ -7079,7 +7081,11 @@ namespace libtorrent
 				}
 				else if (!interesting_blocks.empty())
 				{
-					c.add_request(interesting_blocks.front(), peer_connection::req_time_critical);
+					if (!c.add_request(interesting_blocks.front(), peer_connection::req_time_critical))
+					{
+						peers.erase(p);
+						continue;
+					}
 					added_request = true;
 				}