#ifdef USE_THREADS
PERLVAR(Ithrsv, SV *) /* struct perl_thread for main thread */
PERLVARI(Ithreadnum, U32, 0) /* incremented each thread creation */
+PERLVAR(Istrtab_mutex, perl_mutex) /* Mutex for string table access */
#endif /* USE_THREADS */
PERLVARI(Ibytecode_iv_overflows,int, 0) /* from bytecode.h */