-#define VMG_SET_CB(S, N) \
- cb = (S); \
- w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? SvREFCNT_inc(SvRV(cb)) : NULL;
-
-#define VMG_SET_SVT_CB(S, N) \
- cb = (S); \
- if (SvOK(cb) && SvROK(cb)) { \
- t->svt_ ## N = vmg_svt_ ## N; \
- w->cb_ ## N = SvREFCNT_inc(SvRV(cb)); \
- } else { \
- t->svt_ ## N = NULL; \
- w->cb_ ## N = NULL; \
+static I32 vmg_loaded = 0;
+
+/* We must use preexistent global mutexes or we will never be able to destroy
+ * them. */
+# if VMG_HAS_PERL(5, 9, 3)
+# define VMG_LOADED_LOCK MUTEX_LOCK(&PL_my_ctx_mutex)
+# define VMG_LOADED_UNLOCK MUTEX_UNLOCK(&PL_my_ctx_mutex)
+# else
+# define VMG_LOADED_LOCK OP_REFCNT_LOCK
+# define VMG_LOADED_UNLOCK OP_REFCNT_UNLOCK
+# endif
+
+static void vmg_global_teardown_late_locked(pTHX) {
+#define vmg_global_teardown_late_locked() vmg_global_teardown_late_locked(aTHX)
+ MUTEX_DESTROY(&vmg_op_name_init_mutex);
+ MUTEX_DESTROY(&vmg_vtable_refcount_mutex);
+
+ return;
+}
+
+static int vmg_global_teardown_free(pTHX_ SV *sv, MAGIC *mg) {
+ VMG_LOADED_LOCK;
+
+ if (vmg_loaded == 0)
+ vmg_global_teardown_late_locked();
+
+ VMG_LOADED_UNLOCK;
+
+ return 0;
+}
+
+static MGVTBL vmg_global_teardown_vtbl = {
+ 0,
+ 0,
+ 0,
+ 0,
+ vmg_global_teardown_free
+#if MGf_COPY
+ , 0
+#endif
+#if MGf_DUP
+ , 0
+#endif
+#if MGf_LOCAL
+ , 0
+#endif
+};
+
+static signed char vmg_destruct_level(pTHX) {
+#define vmg_destruct_level() vmg_destruct_level(aTHX)
+ signed char lvl;
+
+ lvl = PL_perl_destruct_level;
+
+#ifdef DEBUGGING
+ {
+ const char *s = PerlEnv_getenv("PERL_DESTRUCT_LEVEL");
+ if (s) {
+ int i;
+#if VMG_HAS_PERL(5, 21, 3)
+ if (strEQ(s, "-1")) {
+ i = -1;
+ } else {
+# if VMG_HAS_PERL(5, 21, 10)
+ UV uv;
+ if (Perl_grok_atoUV(s, &uv, NULL) && uv <= INT_MAX)
+ i = (int) uv;
+ else
+ i = 0;
+# else /* VMG_HAS_PERL(5, 21, 3) && !VMG_HAS_PERL(5, 21, 10) */
+ i = Perl_grok_atou(s, NULL);
+# endif
+ }
+#else /* !VMG_HAS_PERL(5, 21, 3) */
+ i = atoi(s);
+#endif
+ if (lvl < i)
+ lvl = i;
+ }