+#ifdef USE_ITHREADS
+# define OP_REFCNT_INIT MUTEX_INIT(&PL_op_mutex)
+# define OP_REFCNT_LOCK MUTEX_LOCK(&PL_op_mutex)
+# define OP_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_op_mutex)
+# define OP_REFCNT_TERM MUTEX_DESTROY(&PL_op_mutex)
+#else
+# define OP_REFCNT_INIT NOOP
+# define OP_REFCNT_LOCK NOOP
+# define OP_REFCNT_UNLOCK NOOP
+# define OP_REFCNT_TERM NOOP
+#endif
+
+#define OpREFCNT_set(o,n) ((o)->op_targ = (n))
+#define OpREFCNT_inc(o) ((o) ? (++(o)->op_targ, (o)) : Nullop)
+#define OpREFCNT_dec(o) (--(o)->op_targ)
+
+/* flags used by Perl_load_module() */
+#define PERL_LOADMOD_DENY 0x1
+#define PERL_LOADMOD_NOIMPORT 0x2
+#define PERL_LOADMOD_IMPORT_OPS 0x4
+
+#ifdef USE_REENTRANT_API
+
+typedef struct {
+ struct tm* tmbuff;
+} REBUF;
+
+#define localtime(a) (localtime_r((a),PL_reentrant_buffer->tmbuff) ? PL_reentrant_buffer->tmbuff : NULL)
+#define gmtime(a) (gmtime_r((a),PL_reentrant_buffer->tmbuff) ? PL_reentrant_buffer->tmbuff : NULL)
+
+#if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020
+
+/* HP-UX 10.20 returns 0 on success, what it returns on failure is hidden
+ in the fog somewhere, possibly -1 which means the following should do
+ the right thing - 20010816 sky */
+
+#undef localtime
+#undef gmtime
+#define localtime(a) ((localtime_r((a),PL_reentrant_buffer->tmbuff) == 0) ? PL_reentrant_buffer->tmbuff : NULL)
+#define gmtime(a) ((gmtime_r((a),PL_reentrant_buffer->tmbuff) == 0) ? PL_reentrant_buffer->tmbuff : NULL)
+#endif /* HP-UX 10.20 */
+
+#endif
+