--- ./gdb/aix-thread.c_orig
+++ ./gdb/aix-thread.c
@@ -1097,16 +1096,16 @@ pd_enable (void)
   /* If we're debugging a core file or an attached inferior, the
      pthread library may already have been initialized, so try to
      activate thread debugging.  */
-  pd_activate (inferior_ptid.pid ());
+  pd_activate (inf->pid);
 }
 
 /* Undo the effects of pd_enable().  */
 
 static void
-pd_disable (void)
+pd_disable (inferior *inf)
 {
   struct aix_thread_variables *data;
-  data = get_thread_data_helper_for_ptid (inferior_ptid);
+  data = get_aix_thread_variables_data (inf);
 
   if (!data->pd_able)
     return;
@@ -1129,7 +1128,7 @@ static void
 new_objfile (struct objfile *objfile)
 {
   if (objfile)
-    pd_enable ();
+    pd_enable (current_inferior ());
 }
 
 /* Attach to process specified by ARGS.  */
@@ -1137,7 +1136,7 @@ new_objfile (struct objfile *objfile)
 static void
 aix_thread_inferior_created (inferior *inf)
 {
-  pd_enable ();
+  pd_enable (inf);
 }
 
 /* Detach from the process attached to by aix_thread_attach().  */
@@ -1147,7 +1146,7 @@ aix_thread_target::detach (inferior *inf, int from_tty)
 {
   target_ops *beneath = this->beneath ();
 
-  pd_disable ();
+  pd_disable (inf);
   beneath->detach (inf, from_tty);
 }
 
@@ -2066,7 +2065,7 @@ aix_thread_target::mourn_inferior ()
 {
   target_ops *beneath = this->beneath ();
 
-  pd_disable ();
+  pd_disable (current_inferior ());
   beneath->mourn_inferior ();
 }