STATIC SV* S_save_scalar_at(pTHX_ SV **sptr);
#endif
+#if defined(USE_ITHREADS) && (defined(PERL_IN_SHAREDSV_C) || defined(PERL_DECL_PROT))
+PERL_CALLCONV void Perl_sharedsv_init(pTHX);
+PERL_CALLCONV shared_sv* Perl_sharedsv_new(pTHX);
+PERL_CALLCONV shared_sv* Perl_sharedsv_find(pTHX_ SV* sv);
+PERL_CALLCONV void Perl_sharedsv_lock(pTHX_ shared_sv* ssv);
+PERL_CALLCONV void Perl_sharedsv_unlock(pTHX_ shared_sv* ssv);
+PERL_CALLCONV void Perl_sharedsv_unlock_scope(pTHX_ shared_sv* ssv);
+PERL_CALLCONV void Perl_sharedsv_thrcnt_inc(pTHX_ shared_sv* ssv);
+PERL_CALLCONV void Perl_sharedsv_thrcnt_dec(pTHX_ shared_sv* ssv);
+#endif
+
#if defined(PERL_IN_SV_C) || defined(PERL_DECL_PROT)
STATIC IV S_asIV(pTHX_ SV* sv);
STATIC UV S_asUV(pTHX_ SV* sv);