+#ifdef USE_ITHREADS
+# define OP_REFCNT_INIT MUTEX_INIT(&PL_op_mutex)
+# ifdef PERL_CORE
+# define OP_REFCNT_LOCK MUTEX_LOCK(&PL_op_mutex)
+# define OP_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_op_mutex)
+# else
+# define OP_REFCNT_LOCK op_refcnt_lock()
+# define OP_REFCNT_UNLOCK op_refcnt_unlock()
+# endif
+# 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
+#include "reentr.h"
+#endif
+
+#if defined(PL_OP_SLAB_ALLOC)
+#define NewOp(m,var,c,type) \
+ (var = (type *) Perl_Slab_Alloc(aTHX_ m,c*sizeof(type)))
+#define NewOpSz(m,var,size) \
+ (var = (OP *) Perl_Slab_Alloc(aTHX_ m,size))
+#define FreeOp(p) Perl_Slab_Free(aTHX_ p)
+#else
+#define NewOp(m, var, c, type) Newz(m, var, c, type)
+#define NewOpSz(m, var, size) \
+ (var = (OP*)safemalloc(size), memzero(var, size))
+#define FreeOp(p) Safefree(p)
+#endif