+#ifdef LISP_FEATURE_SB_THREAD
+pid_t parent_pid;
+boolean stop_the_world=0;
+#endif
+
+/* For copying GCs, this points to the start of the dynamic space
+ * currently in use (that will become the from_space when the next GC
+ * is done). For the GENCGC, it always points to DYNAMIC_SPACE_START. */
+lispobj *current_dynamic_space;
+