pthread_support.c (GC_get_thread_stack_base): Handle pthread_getattr_np failures.

	* pthread_support.c (GC_get_thread_stack_base): Handle
	pthread_getattr_np failures.

From-SVN: r125957

boehm-gc/ChangeLog

+2007-06-22  Jakub Jelinek  <jakub@redhat.com>
+
+	* pthread_support.c (GC_get_thread_stack_base): Handle
+	pthread_getattr_np failures.
+
 2007-06-02  Paolo Bonzini  <bonzini@gnu.org>
 
 	* configure: Regenerate.

boehm-gc/pthread_support.c

@@ -1135,7 +1135,13 @@ GC_PTR GC_get_thread_stack_base()
   size_t stack_size;
   
   my_pthread = pthread_self();  
-  pthread_getattr_np (my_pthread, &attr);
+  if (pthread_getattr_np (my_pthread, &attr) != 0)
+    {
+#   ifdef DEBUG_THREADS
+      GC_printf1("Can not determine stack base for attached thread");
+#   endif
+      return 0;
+    }
   pthread_attr_getstack (&attr, (void **) &stack_addr, &stack_size);
   pthread_attr_destroy (&attr);