added debug message to dht. fixed while loop around condition variable in checker thread.

src/kademlia/rpc_manager.cpp

@@ -322,8 +322,11 @@ void rpc_manager::invoke(int message_id, udp::endpoint target_addr
 		m_send(m);
 		new_transaction_id(o);
 	}
-	catch (std::exception&)
+	catch (std::exception& e)
 	{
+#ifndef NDEBUG
+		std::cerr << e.what() << "\n";
+#endif
 		assert(false);
 	}
 }

src/session_impl.cpp

@@ -120,7 +120,7 @@ namespace libtorrent { namespace detail
 					// if the job queue is empty and
 					// we shouldn't abort
 					// wait for a signal
-					if (m_torrents.empty() && !m_abort && !processing)
+					while (m_torrents.empty() && !m_abort && !processing)
 						m_cond.wait(l);
 
 					if (m_abort)