X-Git-Url: http://git.vpit.fr/?a=blobdiff_plain;f=Magic.xs;h=0ecf6933caf6975cf3b3388152a4b25b3b63cf4a;hb=6e42ee234deb79fad1c91703e5a7ec3bd8bc47f3;hp=48bcc5774d7213c96940d1e5dff0e4ada8fadabe;hpb=b97c2f9839c9ac31650db1fe80fa07caf7ed88a9;p=perl%2Fmodules%2FVariable-Magic.git

diff --git a/Magic.xs b/Magic.xs
index 48bcc57..0ecf693 100644
--- a/Magic.xs
+++ b/Magic.xs
@@ -12,27 +12,76 @@
 
 #define __PACKAGE__ "Variable::Magic"
 
-#define R(S) fprintf(stderr, "R(" #S ") = %d\n", SvREFCNT(S))
+#ifndef VMG_PERL_PATCHLEVEL
+# ifdef PERL_PATCHNUM
+#  define VMG_PERL_PATCHLEVEL PERL_PATCHNUM
+# else
+#  define VMG_PERL_PATCHLEVEL 0
+# endif
+#endif
 
-#define PERL_VERSION_GE(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
+#define VMG_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
 
-#define PERL_VERSION_LE(R, V, S) (PERL_REVISION < (R) || (PERL_REVISION == (R) && (PERL_VERSION < (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION <= (S))))))
+#define VMG_HAS_PERL_BRANCH(R, V, S) (PERL_REVISION == (R) && PERL_VERSION == (V) && PERL_SUBVERSION >= (S))
 
-#define PERL_API_VERSION_GE(R, V, S) (PERL_API_REVISION > (R) || (PERL_API_REVISION == (R) && (PERL_API_VERSION > (V) || (PERL_API_VERSION == (V) && (PERL_API_SUBVERSION >= (S))))))
+#define VMG_HAS_PERL_MAINT(R, V, S, P) (PERL_REVISION == (R) && PERL_VERSION == (V) && (VMG_PERL_PATCHLEVEL >= (P) || (!VMG_PERL_PATCHLEVEL && PERL_SUBVERSION >= (S))))
 
-#define PERL_API_VERSION_LE(R, V, S) (PERL_API_REVISION < (R) || (PERL_API_REVISION == (R) && (PERL_API_VERSION < (V) || (PERL_API_VERSION == (V) && (PERL_API_SUBVERSION <= (S))))))
+/* --- Threads and multiplicity -------------------------------------------- */
 
-#ifndef VMG_PERL_PATCHLEVEL
-# ifdef PERL_PATCHNUM
-#  define VMG_PERL_PATCHLEVEL PERL_PATCHNUM
+#ifndef NOOP
+# define NOOP
+#endif
+
+#ifndef dNOOP
+# define dNOOP
+#endif
+
+#ifndef VMG_MULTIPLICITY
+# if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
+#  define VMG_MULTIPLICITY 1
 # else
-#  define VMG_PERL_PATCHLEVEL 0
+#  define VMG_MULTIPLICITY 0
+# endif
+#endif
+#if VMG_MULTIPLICITY && !defined(tTHX)
+# define tTHX PerlInterpreter*
+#endif
+
+#if VMG_MULTIPLICITY && defined(USE_ITHREADS) && defined(dMY_CXT) && defined(MY_CXT) && defined(START_MY_CXT) && defined(MY_CXT_INIT) && (defined(MY_CXT_CLONE) || defined(dMY_CXT_SV))
+# define VMG_THREADSAFE 1
+# ifndef MY_CXT_CLONE
+#  define MY_CXT_CLONE \
+    dMY_CXT_SV;                                                      \
+    my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
+    Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
+    sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
 # endif
+#else
+# define VMG_THREADSAFE 0
+# undef  dMY_CXT
+# define dMY_CXT      dNOOP
+# undef  MY_CXT
+# define MY_CXT       vmg_globaldata
+# undef  START_MY_CXT
+# define START_MY_CXT STATIC my_cxt_t MY_CXT;
+# undef  MY_CXT_INIT
+# define MY_CXT_INIT  NOOP
+# undef  MY_CXT_CLONE
+# define MY_CXT_CLONE NOOP
 #endif
 
-#define VMG_HAS_PERL_OR(P, R, V, S) ((VMG_PERL_PATCHLEVEL >= (P)) || (!VMG_PERL_PATCHLEVEL && PERL_VERSION_GE((R), (V), (S))))
+#if VMG_THREADSAFE
+
+STATIC SV *vmg_clone(pTHX_ SV *sv, tTHX owner) {
+#define vmg_clone(P, O) vmg_clone(aTHX_ (P), (O))
+ CLONE_PARAMS param;
+ param.stashes    = NULL; /* don't need it unless sv is a PVHV */
+ param.flags      = 0;
+ param.proto_perl = owner;
+ return sv_dup(sv, &param);
+}
 
-#define VMG_HAS_PERL_AND(P, R, V, S) (PERL_VERSION_GE((R), (V), (S)) && (!VMG_PERL_PATCHLEVEL || (VMG_PERL_PATCHLEVEL >= (P))))
+#endif /* VMG_THREADSAFE */
 
 /* --- Compatibility ------------------------------------------------------- */
 
@@ -48,13 +97,6 @@
 # define mPUSHi(I) PUSHs(sv_2mortal(newSViv(I)))
 #endif
 
-#ifndef dMY_CXT
-# define MY_CXT vmg_globaldata
-# define dMY_CXT
-# define START_MY_CXT STATIC my_cxt_t MY_CXT;
-# define MY_CXT_INIT
-#endif
-
 #ifndef PERL_MAGIC_ext
 # define PERL_MAGIC_ext '~'
 #endif
@@ -71,27 +113,51 @@
 # define MGf_LOCAL 0
 #endif
 
-/* uvar magic and Hash::Util::FieldHash were commited with p28419 */
-#if (VMG_PERL_PATCHLEVEL >= 28419) || (!VMG_PERL_PATCHLEVEL && PERL_VERSION_GE(5, 9, 4))
+#ifndef IN_PERL_COMPILETIME
+# define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
+#endif
+
+#if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
+# ifndef PL_error_count
+#  define PL_error_count PL_parser->error_count
+# endif
+#else
+# ifndef PL_error_count
+#  define PL_error_count PL_Ierror_count
+# endif
+#endif
+
+/* uvar magic and Hash::Util::FieldHash were commited with 28419 */
+#if VMG_HAS_PERL_MAINT(5, 9, 4, 28419) || VMG_HAS_PERL(5, 10, 0)
 # define VMG_UVAR 1
 #else
 # define VMG_UVAR 0
 #endif
 
-#if !defined(VMG_COMPAT_ARRAY_PUSH_NOLEN) && VMG_HAS_PERL_OR(25854, 5, 9, 3)
-# define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
+/* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160 */
+#ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
+# if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
+#  define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
+# else
+#  define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
+# endif
+#endif
+
+/* Applied to dev-5.11 as 34908 */
+#if VMG_HAS_PERL_MAINT(5, 11, 0, 34908)
+# define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
 #else
-# define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
+# define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
 #endif
 
-/* since 5.9.5 - see #43357 */
-#if VMG_HAS_PERL_OR(31473, 5, 9, 5)
+/* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
+#if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
 #else
 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
 #endif
 
-#if VMG_HAS_PERL_OR(32969, 5, 11, 0)
+#if VMG_HAS_PERL_MAINT(5, 11, 0, 32969)
 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
 #else
 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
@@ -105,7 +171,6 @@ STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
  const MAGIC* mg;
  sv_magic(sv, NULL, PERL_MAGIC_uvar, uf, len);
  /* uvar magic has set and get magic, hence this has set SVs_GMG and SVs_SMG. */
- PERL_UNUSED_CONTEXT;
  if ((mg = SvMAGIC(sv))) {
   SvRMAGICAL_off(sv);
   do {
@@ -126,10 +191,7 @@ STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
 
 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
 
-typedef struct {
- HV *wizz;
- U16 count;
-} my_cxt_t;
+typedef HV * my_cxt_t;
 
 START_MY_CXT
 
@@ -150,7 +212,7 @@ STATIC U16 vmg_gensig(pTHX) {
 
  do {
   sig = SIG_NBR * Drand01() + SIG_MIN;
- } while (hv_exists(MY_CXT.wizz, buf, sprintf(buf, "%u", sig)));
+ } while (hv_exists(MY_CXT, buf, sprintf(buf, "%u", sig)));
 
  return sig;
 }
@@ -175,6 +237,9 @@ typedef struct {
 #if VMG_UVAR
  SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
 #endif /* VMG_UVAR */
+#if VMG_MULTIPLICITY
+ tTHX owner;
+#endif /* VMG_MULTIPLICITY */
 } MGWIZ;
 
 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
@@ -185,31 +250,29 @@ typedef struct {
 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
  SV *nsv;
+ I32 i, alen = (args == NULL) ? 0 : av_len(args);
 
  dSP;
- int count;
 
  ENTER;
  SAVETMPS;
 
  PUSHMARK(SP);
- XPUSHs(sv_2mortal(newRV_inc(sv)));
- if (args != NULL) {
-  I32 i, alen = av_len(args);
-  for (i = 0; i < alen; ++i) { XPUSHs(*av_fetch(args, i, 0)); }
- }
+ EXTEND(SP, alen + 1);
+ PUSHs(sv_2mortal(newRV_inc(sv)));
+ for (i = 0; i < alen; ++i)
+  PUSHs(*av_fetch(args, i, 0));
  PUTBACK;
 
- count = call_sv(ctor, G_SCALAR);
+ call_sv(ctor, G_SCALAR);
 
  SPAGAIN;
 
- if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
  nsv = POPs;
-#if PERL_VERSION_LE(5, 8, 2)
- nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
-#else
+#if VMG_HAS_PERL(5, 8, 3)
  SvREFCNT_inc(nsv);    /* Or it will be destroyed in FREETMPS */
+#else
+ nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
 #endif
 
  PUTBACK;
@@ -270,17 +333,18 @@ STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz, AV *args) {
  data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
  mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
  mg->mg_private = w->sig;
- mg->mg_flags   = mg->mg_flags
 #if MGf_COPY
-                | MGf_COPY
+ if (w->cb_copy)
+  mg->mg_flags |= MGf_COPY;
 #endif /* MGf_COPY */
-#if MGf_DUP
-                | MGf_DUP
+#if 0 /* MGf_DUP */
+ if (w->cb_dup)
+  mg->mg_flags |= MGf_DUP;
 #endif /* MGf_DUP */
 #if MGf_LOCAL
-                | MGf_LOCAL
+ if (w->cb_local)
+  mg->mg_flags |= MGf_LOCAL;
 #endif /* MGf_LOCAL */
-                ;
 
 #if VMG_UVAR
  if (w->uvar && SvTYPE(sv) >= SVt_PVHV) {
@@ -406,14 +470,18 @@ STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
 
 /* ... svt callbacks ....................................................... */
 
-STATIC int vmg_cb_call(pTHX_ SV *cb, SV *sv, SV *data, unsigned int args, ...) {
+#define VMG_CB_CALL_ARGS_MASK 15
+#define VMG_CB_CALL_EVAL      16
+
+STATIC int vmg_cb_call(pTHX_ SV *cb, SV *sv, SV *data, unsigned int flags, ...){
  va_list ap;
  SV *svr;
  int ret;
  unsigned int i;
+ unsigned int args = flags & VMG_CB_CALL_ARGS_MASK;
+ unsigned int eval = flags & VMG_CB_CALL_EVAL ? G_EVAL : 0;
 
  dSP;
- int count;
 
  ENTER;
  SAVETMPS;
@@ -422,7 +490,7 @@ STATIC int vmg_cb_call(pTHX_ SV *cb, SV *sv, SV *data, unsigned int args, ...) {
  EXTEND(SP, args + 2);
  PUSHs(sv_2mortal(newRV_inc(sv)));
  PUSHs(data ? data : &PL_sv_undef);
- va_start(ap, args);
+ va_start(ap, flags);
  for (i = 0; i < args; ++i) {
   SV *sva = va_arg(ap, SV *);
   PUSHs(sva ? sva : &PL_sv_undef);
@@ -430,23 +498,24 @@ STATIC int vmg_cb_call(pTHX_ SV *cb, SV *sv, SV *data, unsigned int args, ...) {
  va_end(ap);
  PUTBACK;
 
- count = call_sv(cb, G_SCALAR);
+ call_sv(cb, G_SCALAR | eval);
 
  SPAGAIN;
-
- if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
+ if (eval && IN_PERL_COMPILETIME && SvTRUE(ERRSV))
+  ++PL_error_count;
  svr = POPs;
  ret = SvOK(svr) ? SvIV(svr) : 0;
-
  PUTBACK;
 
  FREETMPS;
  LEAVE;
 
+
  return ret;
 }
 
 #define vmg_cb_call1(I, S, D)         vmg_cb_call(aTHX_ (I), (S), (D), 0)
+#define vmg_cb_call1e(I, S, D)        vmg_cb_call(aTHX_ (I), (S), (D), VMG_CB_CALL_EVAL)
 #define vmg_cb_call2(I, S, D, S2)     vmg_cb_call(aTHX_ (I), (S), (D), 1, (S2))
 #define vmg_cb_call3(I, S, D, S2, S3) vmg_cb_call(aTHX_ (I), (S), (D), 2, (S2), (S3))
 
@@ -460,12 +529,14 @@ STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
 
 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
  SV *svr;
- I32 len;
+ I32 len, has_array;
  U32 ret;
 
  dSP;
  int count;
 
+ has_array = SvTYPE(sv) == SVt_PVAV;
+
  ENTER;
  SAVETMPS;
 
@@ -473,11 +544,11 @@ STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
  EXTEND(SP, 3);
  PUSHs(sv_2mortal(newRV_inc(sv)));
  PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
- if (SvTYPE(sv) == SVt_PVAV) {
+ if (has_array) {
   len = av_len((AV *) sv) + 1;
   mPUSHi(len);
  } else {
-  len = 1;
+  len = 0;
   PUSHs(&PL_sv_undef);
  }
  PUTBACK;
@@ -485,17 +556,14 @@ STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
  count = call_sv(SV2MGWIZ(mg->mg_ptr)->cb_len, G_SCALAR);
 
  SPAGAIN;
-
- if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
  svr = POPs;
  ret = SvOK(svr) ? SvUV(svr) : len;
-
  PUTBACK;
 
  FREETMPS;
  LEAVE;
 
- return ret - 1;
+ return has_array ? ret - 1 : ret;
 }
 
 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
@@ -505,14 +573,20 @@ STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
  /* So that it can survive tmp cleanup in vmg_cb_call */
  SvREFCNT_inc(sv);
+#if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
+ /* The previous magic tokens were freed but the magic chain wasn't updated, so
+  * if you access the sv from the callback the old deleted magics will trigger
+  * and cause memory misreads. Change 32686 solved it that way : */
+ SvMAGIC_set(sv, mg);
+#endif
  /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
   * mg->mg_ptr reference count */
- return vmg_cb_call1(SV2MGWIZ(mg->mg_ptr)->cb_free, sv, mg->mg_obj);
+ return vmg_cb_call1e(SV2MGWIZ(mg->mg_ptr)->cb_free, sv, mg->mg_obj);
 }
 
 #if MGf_COPY
 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
-# if (VMG_PERL_PATCHLEVEL >= 33256) || (!VMG_PERL_PATCHLEVEL && PERL_API_VERSION_GE(5, 11, 0))
+# if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
   I32 keylen
 # else
   int keylen
@@ -598,17 +672,24 @@ STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
  char buf[8];
  MGWIZ *w;
- dMY_CXT;
 
- w = SV2MGWIZ(wiz);
+ if (PL_dirty) /* during global destruction, the context is already freed */
+  return 0;
 
- SvREFCNT_inc(wiz); /* Fake survival - it's gonna be deleted anyway */
-#if PERL_API_VERSION_GE(5, 9, 5)
- SvREFCNT_inc(wiz); /* One more push */
-#endif
- if (hv_delete(MY_CXT.wizz, buf, sprintf(buf, "%u", w->sig), 0)) {
-  --MY_CXT.count;
+ w = SV2MGWIZ(wiz);
+#if VMG_MULTIPLICITY
+ if (w->owner != aTHX)
+  return 0;
+ w->owner = NULL;
+#endif /* VMG_MULTIPLICITY */
+
+ {
+  dMY_CXT;
+  if (hv_delete(MY_CXT, buf, sprintf(buf, "%u", w->sig), 0) != wiz)
+   return 0;
  }
+ SvFLAGS(wiz) |= SVf_BREAK;
+ FREETMPS;
 
  if (w->cb_data  != NULL) { SvREFCNT_dec(SvRV(w->cb_data)); }
  if (w->cb_get   != NULL) { SvREFCNT_dec(SvRV(w->cb_get)); }
@@ -619,7 +700,7 @@ STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
 #if MGf_COPY
  if (w->cb_copy  != NULL) { SvREFCNT_dec(SvRV(w->cb_copy)); }
 #endif /* MGf_COPY */
-#if MGf_DUP
+#if 0 /* MGf_DUP */
  if (w->cb_dup   != NULL) { SvREFCNT_dec(SvRV(w->cb_dup)); }
 #endif /* MGf_DUP */
 #if MGf_LOCAL
@@ -631,6 +712,7 @@ STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
  if (w->cb_exists != NULL) { SvREFCNT_dec(SvRV(w->cb_exists)); }
  if (w->cb_delete != NULL) { SvREFCNT_dec(SvRV(w->cb_delete)); }
 #endif /* VMG_UVAR */
+
  Safefree(w->vtbl);
  Safefree(w);
 
@@ -655,7 +737,6 @@ STATIC MGVTBL vmg_wizard_vtbl = {
 };
 
 STATIC const char vmg_invalid_wiz[]    = "Invalid wizard object";
-STATIC const char vmg_invalid_sv[]     = "Invalid variable";
 STATIC const char vmg_invalid_sig[]    = "Invalid numeric signature";
 STATIC const char vmg_wrongargnum[]    = "Wrong number of arguments";
 STATIC const char vmg_toomanysigs[]    = "Too many magic signatures used";
@@ -680,6 +761,53 @@ STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
  return sig;
 }
 
+STATIC U16 vmg_wizard_sig(pTHX_ SV *wiz) {
+#define vmg_wizard_sig(W) vmg_wizard_sig(aTHX_ (W))
+ char buf[8];
+ U16 sig;
+
+ if (SvROK(wiz)) {
+  sig = SV2MGWIZ(SvRV(wiz))->sig;
+ } else if (SvOK(wiz)) {
+  sig = vmg_sv2sig(wiz);
+ } else {
+  croak(vmg_invalid_wiz);
+ }
+
+ {
+  dMY_CXT;
+  if (!hv_fetch(MY_CXT, buf, sprintf(buf, "%u", sig), 0))
+   sig = 0;
+ }
+ return sig;
+}
+
+STATIC SV *vmg_wizard_wiz(pTHX_ SV *wiz) {
+#define vmg_wizard_wiz(W) vmg_wizard_wiz(aTHX_ (W))
+ char buf[8];
+ SV **old;
+ U16 sig;
+
+ if (SvROK(wiz)) {
+  wiz = SvRV(wiz);
+#if VMG_MULTIPLICITY
+  if (SV2MGWIZ(wiz)->owner == aTHX)
+   return wiz;
+#endif /* VMG_MULTIPLICITY */
+  sig = SV2MGWIZ(wiz)->sig;
+ } else if (SvOK(wiz)) {
+  sig = vmg_sv2sig(wiz);
+ } else {
+  croak(vmg_invalid_wiz);
+ }
+
+ {
+  dMY_CXT;
+  return (old = hv_fetch(MY_CXT, buf, sprintf(buf, "%u", sig), 0))
+          ? *old : NULL;
+ }
+}
+
 #define VMG_SET_CB(S, N)              \
  cb = (S);                            \
  w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? newRV_inc(SvRV(cb)) : NULL;
@@ -694,6 +822,52 @@ STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
   w->cb_  ## N = NULL;                \
  }
 
+#if VMG_THREADSAFE
+
+#define VMG_CLONE_CB(N) \
+ z->cb_ ## N = (w->cb_ ## N) ? newRV_inc(vmg_clone(SvRV(w->cb_ ## N), \
+                                         w->owner))                   \
+                             : NULL;
+
+STATIC MGWIZ *vmg_wizard_clone(pTHX_ const MGWIZ *w) {
+#define vmg_wizard_clone(W) vmg_wizard_clone(aTHX_ (W))
+ MGVTBL *t;
+ MGWIZ *z;
+
+ Newx(t, 1, MGVTBL);
+ Copy(w->vtbl, t, 1, MGVTBL);
+
+ Newx(z, 1, MGWIZ);
+ VMG_CLONE_CB(data);
+ VMG_CLONE_CB(get);
+ VMG_CLONE_CB(set);
+ VMG_CLONE_CB(len);
+ VMG_CLONE_CB(clear);
+ VMG_CLONE_CB(free);
+#if MGf_COPY
+ VMG_CLONE_CB(copy);
+#endif /* MGf_COPY */
+#if MGf_DUP
+ VMG_CLONE_CB(dup);
+#endif /* MGf_DUP */
+#if MGf_LOCAL
+ VMG_CLONE_CB(local);
+#endif /* MGf_LOCAL */
+#if VMG_UVAR
+ VMG_CLONE_CB(fetch);
+ VMG_CLONE_CB(store);
+ VMG_CLONE_CB(exists);
+ VMG_CLONE_CB(delete);
+#endif /* VMG_UVAR */
+ z->owner = aTHX;
+ z->vtbl  = t;
+ z->sig   = w->sig;
+ z->uvar  = w->uvar;
+
+ return z;
+}
+
+#endif /* VMG_THREADSAFE */
 
 /* --- XS ------------------------------------------------------------------ */
 
@@ -705,8 +879,8 @@ BOOT:
 {
  HV *stash;
  MY_CXT_INIT;
- MY_CXT.wizz = newHV();
- MY_CXT.count = 0;
+ MY_CXT = newHV();
+ hv_iterinit(MY_CXT); /* Allocate iterator */
  stash = gv_stashpv(__PACKAGE__, 1);
  newCONSTSUB(stash, "SIG_MIN",   newSVuv(SIG_MIN));
  newCONSTSUB(stash, "SIG_MAX",   newSVuv(SIG_MAX));
@@ -717,12 +891,47 @@ BOOT:
  newCONSTSUB(stash, "VMG_UVAR",  newSVuv(VMG_UVAR));
  newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
                     newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
+ newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
+                    newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
  newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
                     newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
  newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
                     newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
+ newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
+ newCONSTSUB(stash, "VMG_THREADSAFE",      newSVuv(VMG_THREADSAFE));
 }
 
+void
+CLONE(...)
+PROTOTYPE: DISABLE
+PREINIT:
+ HV *hv;
+CODE:
+#if VMG_THREADSAFE
+ {
+  HE *key;
+  dMY_CXT;
+  hv = newHV();
+  hv_iterinit(hv); /* Allocate iterator */
+  hv_iterinit(MY_CXT);
+  while ((key = hv_iternext(MY_CXT))) {
+   STRLEN len;
+   char *sig = HePV(key, len);
+   SV *sv;
+   MAGIC *mg;
+   sv = MGWIZ2SV(vmg_wizard_clone(SV2MGWIZ(HeVAL(key))));
+   mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
+   mg->mg_private = SIG_WIZ;
+   SvREADONLY_on(sv);
+   hv_store(hv, sig, len, sv, HeHASH(key));
+  }
+ }
+ {
+  MY_CXT_CLONE;
+  MY_CXT = hv;
+ }
+#endif /* VMG_THREADSAFE */
+
 SV *_wizard(...)
 PROTOTYPE: DISABLE
 PREINIT:
@@ -757,12 +966,12 @@ CODE:
  if (SvOK(svsig)) {
   SV **old;
   sig = vmg_sv2sig(svsig);
-  if ((old = hv_fetch(MY_CXT.wizz, buf, sprintf(buf, "%u", sig), 0))) {
+  if ((old = hv_fetch(MY_CXT, buf, sprintf(buf, "%u", sig), 0))) {
    ST(0) = sv_2mortal(newRV_inc(*old));
    XSRETURN(1);
   }
  } else {
-  if (MY_CXT.count >= SIG_NBR) { croak(vmg_toomanysigs); }
+  if (HvKEYS(MY_CXT) >= SIG_NBR) { croak(vmg_toomanysigs); }
   sig = vmg_gensig();
  }
  
@@ -793,6 +1002,9 @@ CODE:
  VMG_SET_CB(ST(i++), exists);
  VMG_SET_CB(ST(i++), delete);
 #endif /* VMG_UVAR */
+#if VMG_MULTIPLICITY
+ w->owner = aTHX;
+#endif /* VMG_MULTIPLICITY */
 
  w->vtbl = t;
  w->sig  = sig;
@@ -801,12 +1013,12 @@ CODE:
 #endif /* VMG_UVAR */
 
  sv = MGWIZ2SV(w);
- mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, -1);
+ mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
  mg->mg_private = SIG_WIZ;
+ SvREADONLY_on(sv);
+
+ hv_store(MY_CXT, buf, sprintf(buf, "%u", sig), sv, 0);
 
- hv_store(MY_CXT.wizz, buf, sprintf(buf, "%u", sig), sv, 0);
- ++MY_CXT.count;
- 
  RETVAL = newRV_noinc(sv);
 OUTPUT:
  RETVAL
@@ -815,7 +1027,7 @@ SV *gensig()
 PROTOTYPE:
 CODE:
  dMY_CXT;
- if (MY_CXT.count >= SIG_NBR) { croak(vmg_toomanysigs); }
+ if (HvKEYS(MY_CXT) >= SIG_NBR) { croak(vmg_toomanysigs); }
  RETVAL = newSVuv(vmg_gensig());
 OUTPUT:
  RETVAL
@@ -834,21 +1046,9 @@ PREINIT:
  AV *args = NULL;
  SV *ret;
 CODE:
- dMY_CXT;
- if (SvROK(wiz)) {
-  wiz = SvRV(wiz);
- } else if (SvOK(wiz)) {
-  char buf[8];
-  SV **old;
-  U16 sig = vmg_sv2sig(wiz);
-  if ((old = hv_fetch(MY_CXT.wizz, buf, sprintf(buf, "%u", sig), 0))) {
-   wiz = *old;
-  } else {
-   XSRETURN_UNDEF;
-  }
- } else {
-  croak(vmg_invalid_sig);
- }
+ wiz = vmg_wizard_wiz(wiz);
+ if (!wiz)
+  XSRETURN_UNDEF;
  if (items > 2) {
   I32 i;
   args = newAV();
@@ -871,18 +1071,9 @@ PREINIT:
  SV *data;
  U16 sig;
 CODE:
- dMY_CXT;
- if (SvROK(wiz)) {
-  sig = SV2MGWIZ(SvRV(wiz))->sig;
- } else if (SvOK(wiz)) {
-  char buf[8];
-  sig = vmg_sv2sig(wiz);
-  if (!hv_fetch(MY_CXT.wizz, buf, sprintf(buf, "%u", sig), 0)) {
-   XSRETURN_UNDEF;
-  }
- } else {
-  croak(vmg_invalid_wiz);
- }
+ sig = vmg_wizard_sig(wiz);
+ if (!sig)
+  XSRETURN_UNDEF;
  data = vmg_data_get(SvRV(sv), sig);
  if (!data) { XSRETURN_UNDEF; }
  ST(0) = data;
@@ -893,18 +1084,9 @@ PROTOTYPE: \[$@%&*]$
 PREINIT:
  U16 sig;
 CODE:
- dMY_CXT;
- if (SvROK(wiz)) {
-  sig = SV2MGWIZ(SvRV(wiz))->sig;
- } else if (SvOK(wiz)) {
-  char buf[8];
-  sig = vmg_sv2sig(wiz);
-  if (!hv_fetch(MY_CXT.wizz, buf, sprintf(buf, "%u", sig), 0)) {
-   XSRETURN_UNDEF;
-  }
- } else {
-  croak(vmg_invalid_wiz);
- }
+ sig = vmg_wizard_sig(wiz);
+ if (!sig)
+  XSRETURN_UNDEF;
  RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));
 OUTPUT:
  RETVAL