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Diffstat (limited to 'libguile/frames.c')
-rw-r--r--libguile/frames.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/libguile/frames.c b/libguile/frames.c
index a7143c411..9e77908b9 100644
--- a/libguile/frames.c
+++ b/libguile/frames.c
@@ -82,20 +82,26 @@ SCM_DEFINE (scm_frame_procedure, "frame-procedure", 1, 0, 0,
}
#undef FUNC_NAME
+static SCM frame_arguments_var;
+
+static void
+init_frame_arguments_var (void)
+{
+ frame_arguments_var
+ = scm_c_private_lookup ("system vm frame", "frame-arguments");
+}
+
SCM_DEFINE (scm_frame_arguments, "frame-arguments", 1, 0, 0,
(SCM frame),
"")
#define FUNC_NAME s_scm_frame_arguments
{
- static SCM var = SCM_BOOL_F;
-
- SCM_VALIDATE_VM_FRAME (1, frame);
+ static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT;
+ scm_i_pthread_once (&once, init_frame_arguments_var);
- if (scm_is_false (var))
- var = scm_c_module_lookup (scm_c_resolve_module ("system vm frame"),
- "frame-arguments");
+ SCM_VALIDATE_VM_FRAME (1, frame);
- return scm_call_1 (SCM_VARIABLE_REF (var), frame);
+ return scm_call_1 (scm_variable_ref (frame_arguments_var), frame);
}
#undef FUNC_NAME