+
+static int indirect_is_loaded(pTHX_ void *cxt) {
+#define indirect_is_loaded(C) indirect_is_loaded(aTHX_ (C))
+ int res = 0;
+
+ I_LOADED_LOCK;
+ if (indirect_loaded_cxts && ptable_fetch(indirect_loaded_cxts, cxt))
+ res = 1;
+ I_LOADED_UNLOCK;
+
+ return res;
+}
+
+static int indirect_set_loaded_locked(pTHX_ void *cxt) {
+#define indirect_set_loaded_locked(C) indirect_set_loaded_locked(aTHX_ (C))
+ int global_setup = 0;
+
+ if (indirect_loaded <= 0) {
+ assert(!indirect_loaded_cxts);
+ indirect_loaded_cxts = ptable_new();
+ global_setup = 1;
+ }
+ ++indirect_loaded;
+ assert(indirect_loaded_cxts);
+ ptable_loaded_store(indirect_loaded_cxts, cxt, cxt);
+
+ return global_setup;
+}
+
+static int indirect_clear_loaded_locked(pTHX_ void *cxt) {
+#define indirect_clear_loaded_locked(C) indirect_clear_loaded_locked(aTHX_ (C))
+ int global_teardown = 0;
+
+ if (indirect_loaded > 1) {
+ assert(indirect_loaded_cxts);
+ ptable_loaded_delete(indirect_loaded_cxts, cxt);
+ --indirect_loaded;
+ } else if (indirect_loaded_cxts) {
+ ptable_loaded_free(indirect_loaded_cxts);
+ indirect_loaded_cxts = NULL;
+ indirect_loaded = 0;
+ global_teardown = 1;
+ }
+
+ return global_teardown;
+}
+
+#else
+
+#define I_LOADED_LOCK NOOP
+#define I_LOADED_UNLOCK NOOP
+
+#define indirect_is_loaded(C) (indirect_loaded > 0)
+#define indirect_set_loaded_locked(C) ((indirect_loaded++ <= 0) ? 1 : 0)
+#define indirect_clear_loaded_locked(C) ((--indirect_loaded <= 0) ? 1 : 0)
+
+#endif
+
+/* ... Thread-safe hints ................................................... */
+
+#if I_WORKAROUND_REQUIRE_PROPAGATION
+
+typedef struct {
+ SV *code;
+ IV require_tag;