2010-11-23 Phil Muldoon <pmuldoon@redhat.com>

PR python/12212

	* python/py-inferior.c (find_thread_object): Check if PIDGET
	returns 0.

2010-11-23  Phil Muldoon  <pmuldoon@redhat.com>

        PR python/12212

	* gdb.python/python.exp: Check that selected_thread raises an
	error when no inferior is loaded.

gdb/ChangeLog

@@ -1,4 +1,11 @@
-2010-11-22  Joel Brobecker  <brobecker@adacore.com>
+2010-11-23  Phil Muldoon  <pmuldoon@redhat.com>
+
+        PR python/12212
+
+	* python/py-inferior.c (find_thread_object): Check if PIDGET
+	returns 0.
+
+010-11-22  Joel Brobecker  <brobecker@adacore.com>
 
 	* ada-lang.c (ada_template_to_fixed_record_type_1): Delete bit_incr.
 

gdb/python/py-inferior.c

@@ -130,6 +130,9 @@ find_thread_object (ptid_t ptid)
   PyObject *inf_obj;
 
   pid = PIDGET (ptid);
+  if (pid == 0)
+    return NULL;
+
   inf_obj = find_inferior_object (pid);
 
   if (inf_obj)

gdb/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2010-11-23  Phil Muldoon  <pmuldoon@redhat.com>
+
+        PR python/12212
+
+	* gdb.python/python.exp: Check that selected_thread raises an
+	error when no inferior is loaded.
+
 2010-11-20  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* gdb.dwarf2/dw2-stack-boundary.exp: New file.

gdb/testsuite/gdb.python/python.exp

@@ -146,6 +146,11 @@ gdb_test_no_output "python a = gdb.execute('help', to_string=True)" "collect hel
 
 gdb_test "python print a" ".*aliases -- Aliases of other commands.*" "verify help to uiout"
 
+# Test PR 12212, using InfThread.selected_thread() when no inferior is
+# loaded.
+gdb_py_test_silent_cmd "python nothread = gdb.selected_thread()" "Attempt to aquire thread with no inferior" 1
+gdb_test "python print nothread == None" "True" "Ensure that no threads are returned"
+
 # Start with a fresh gdb.
 clean_restart ${testfile}