-/* sharedsv.c
+/* shared.xs
*
- * Copyright (c) 2001, Larry Wall
+ * Copyright (c) 2001-2002, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
#include "perl.h"
#include "XSUB.h"
+#ifdef USE_ITHREADS
+
#define SHAREDSvPTR(a) ((a)->sv)
/*
*/
PerlInterpreter *PL_sharedsv_space; /* The shared sv space */
/* To access shared space we fake aTHX in this scope and thread's context */
-#define SHARED_CONTEXT PERL_SET_CONTEXT((aTHX = PL_sharedsv_space))
+
+/* bug #24255: we include ENTER+SAVETMPS/FREETMPS+LEAVE with
+ * SHARED_CONTEXT/CALLER_CONTEXT macros, so that any mortals etc created
+ * while in the shared interpreter context don't languish */
+
+#define SHARED_CONTEXT \
+ STMT_START { \
+ PERL_SET_CONTEXT((aTHX = PL_sharedsv_space)); \
+ ENTER; \
+ SAVETMPS; \
+ } STMT_END
/* So we need a way to switch back to the caller's context... */
/* So we declare _another_ copy of the aTHX variable ... */
#define dTHXc PerlInterpreter *caller_perl = aTHX
+
/* and use it to switch back */
-#define CALLER_CONTEXT PERL_SET_CONTEXT((aTHX = caller_perl))
+#define CALLER_CONTEXT \
+ STMT_START { \
+ FREETMPS; \
+ LEAVE; \
+ PERL_SET_CONTEXT((aTHX = caller_perl)); \
+ } STMT_END
/*
* Only one thread at a time is allowed to mess with shared space.
}
void
+recursive_lock_destroy(pTHX_ recursive_lock_t *lock)
+{
+ MUTEX_DESTROY(&lock->mutex);
+ COND_DESTROY(&lock->cond);
+}
+
+void
recursive_lock_release(pTHX_ recursive_lock_t *lock)
{
MUTEX_LOCK(&lock->mutex);
shared_sv *shared = (shared_sv *) mg->mg_ptr;
assert( aTHX == PL_sharedsv_space );
if (shared) {
+ recursive_lock_destroy(aTHX_ &shared->lock);
+ COND_DESTROY(&shared->user_cond);
PerlMemShared_free(shared);
mg->mg_ptr = NULL;
}
/* Try shared SV as 1st choice */
if (!data && ssv && SvTYPE(ssv) >= SVt_PVMG) {
- if (mg = mg_find(ssv, PERL_MAGIC_ext)) {
+ if( (mg = mg_find(ssv, PERL_MAGIC_ext)) ){
data = (shared_sv *) mg->mg_ptr;
}
}
/* If neither of those then create a new one */
if (!data) {
SHARED_CONTEXT;
- if (!ssv)
+ if (!ssv) {
ssv = newSV(0);
+ SvREFCNT(ssv) = 0;
+ }
data = PerlMemShared_malloc(sizeof(shared_sv));
Zero(data,1,shared_sv);
SHAREDSvPTR(data) = ssv;
if (sv && SvTYPE(ssv) < SvTYPE(sv)) {
SHARED_CONTEXT;
sv_upgrade(ssv, SvTYPE(*psv));
+ if (SvTYPE(ssv) == SVt_PVAV) /* #24061 */
+ AvREAL_on(ssv);
CALLER_CONTEXT;
}
mg->mg_flags |= (MGf_COPY|MGf_DUP);
SvREFCNT_inc(ssv);
SvREFCNT_dec(obj);
+ if(SvOBJECT(ssv)) {
+ STRLEN len;
+ char* stash_ptr = SvPV((SV*) SvSTASH(ssv), len);
+ HV* stash = gv_stashpvn(stash_ptr, len, TRUE);
+ SvOBJECT_on(sv);
+ SvSTASH(sv) = (HV*)SvREFCNT_inc(stash);
+ }
}
break;
}
}
+#if defined(WIN32) || defined(OS2)
+# define ABS2RELMILLI(abs) \
+ do { \
+ abs -= (double)time(NULL); \
+ if (abs > 0) { abs *= 1000; } \
+ else { abs = 0; } \
+ } while (0)
+#endif /* WIN32 || OS2 */
+
+bool
+Perl_sharedsv_cond_timedwait(perl_cond *cond, perl_mutex *mut, double abs)
+{
+#if defined(NETWARE) || defined(FAKE_THREADS) || defined(I_MACH_CTHREADS)
+ Perl_croak_nocontext("cond_timedwait not supported on this platform");
+#else
+# ifdef WIN32
+ int got_it = 0;
+
+ ABS2RELMILLI(abs);
+
+ cond->waiters++;
+ MUTEX_UNLOCK(mut);
+ /* See comments in win32/win32thread.h COND_WAIT vis-a-vis race */
+ switch (WaitForSingleObject(cond->sem, (DWORD)abs)) {
+ case WAIT_OBJECT_0: got_it = 1; break;
+ case WAIT_TIMEOUT: break;
+ default:
+ /* WAIT_FAILED? WAIT_ABANDONED? others? */
+ Perl_croak_nocontext("panic: cond_timedwait (%ld)",GetLastError());
+ break;
+ }
+ MUTEX_LOCK(mut);
+ cond->waiters--;
+ return got_it;
+# else
+# ifdef OS2
+ int rc, got_it = 0;
+ STRLEN n_a;
+
+ ABS2RELMILLI(abs);
+
+ if ((rc = DosResetEventSem(*cond,&n_a)) && (rc != ERROR_ALREADY_RESET))
+ Perl_rc = rc, croak_with_os2error("panic: cond_timedwait-reset");
+ MUTEX_UNLOCK(mut);
+ if (CheckOSError(DosWaitEventSem(*cond,abs))
+ && (rc != ERROR_INTERRUPT))
+ croak_with_os2error("panic: cond_timedwait");
+ if (rc == ERROR_INTERRUPT) errno = EINTR;
+ MUTEX_LOCK(mut);
+ return got_it;
+# else /* hope you're I_PTHREAD! */
+ struct timespec ts;
+ int got_it = 0;
+
+ ts.tv_sec = (long)abs;
+ abs -= (NV)ts.tv_sec;
+ ts.tv_nsec = (long)(abs * 1000000000.0);
+
+ switch (pthread_cond_timedwait(cond, mut, &ts)) {
+ case 0: got_it = 1; break;
+ case ETIMEDOUT: break;
+ default:
+ Perl_croak_nocontext("panic: cond_timedwait");
+ break;
+ }
+ return got_it;
+# endif /* OS2 */
+# endif /* WIN32 */
+#endif /* NETWARE || FAKE_THREADS || I_MACH_CTHREADS */
+}
+
/* MAGIC (in mg.h sense) hooks */
int
sv_setsv_nomg(sv, &PL_sv_undef);
SvRV(sv) = obj;
SvROK_on(sv);
+
}
else {
sv_setsv_nomg(sv, SHAREDSvPTR(shared));
tmp = newRV(SHAREDSvPTR(target));
sv_setsv_nomg(SHAREDSvPTR(shared), tmp);
SvREFCNT_dec(tmp);
+ if(SvOBJECT(SvRV(sv))) {
+ SV* fake_stash = newSVpv(HvNAME(SvSTASH(SvRV(sv))),0);
+ SvOBJECT_on(SHAREDSvPTR(target));
+ SvSTASH(SHAREDSvPTR(target)) = (HV*)fake_stash;
+ }
CALLER_CONTEXT;
}
else {
}
}
else {
- SvTEMP_off(sv);
+ SvTEMP_off(sv);
SHARED_CONTEXT;
sv_setsv_nomg(SHAREDSvPTR(shared), sv);
+ if(SvOBJECT(sv)) {
+ SV* fake_stash = newSVpv(HvNAME(SvSTASH(sv)),0);
+ SvOBJECT_on(SHAREDSvPTR(shared));
+ SvSTASH(SHAREDSvPTR(shared)) = (HV*)fake_stash;
+ }
CALLER_CONTEXT;
}
if (!allowed) {
assert ( SHAREDSvPTR(shared) );
ENTER_LOCK;
-
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
assert ( mg->mg_ptr == 0 );
SHARED_CONTEXT;
sharedsv_elem_mg_DELETE(pTHX_ SV *sv, MAGIC *mg)
{
dTHXc;
+ MAGIC *shmg;
shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
ENTER_LOCK;
sharedsv_elem_mg_FETCH(aTHX_ sv, mg);
+ if ((shmg = mg_find(sv, PERL_MAGIC_shared_scalar)))
+ sharedsv_scalar_mg_get(aTHX_ sv, shmg);
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
SHARED_CONTEXT;
av_delete((AV*) SHAREDSvPTR(shared), mg->mg_len, G_DISCARD);
MAGIC *nmg = sv_magicext(nsv,mg->mg_obj,
toLOWER(mg->mg_type),&sharedsv_elem_vtbl,
name, namlen);
+ ENTER_LOCK;
SvREFCNT_inc(SHAREDSvPTR(shared));
+ LEAVE_LOCK;
nmg->mg_flags |= MGf_DUP;
return 1;
}
recursive_lock_acquire(aTHX_ &ssv->lock, __FILE__, __LINE__);
}
+/* handles calls from lock() builtin via PL_lockhook */
+
void
Perl_sharedsv_locksv(pTHX_ SV *sv)
{
- Perl_sharedsv_lock(aTHX_ Perl_sharedsv_find(aTHX_ sv));
+ shared_sv* shared;
+
+ if(SvROK(sv))
+ sv = SvRV(sv);
+ shared = Perl_sharedsv_find(aTHX_ sv);
+ if(!shared)
+ croak("lock can only be used on shared values");
+ Perl_sharedsv_lock(aTHX_ shared);
}
=head1 Shared SV Functions
=for apidoc sharedsv_init
Saves a space for keeping SVs wider than an interpreter,
-currently only stores a pointer to the first interpreter.
=cut
PL_sharehook = &Perl_sharedsv_share;
}
+#endif /* USE_ITHREADS */
+
MODULE = threads::shared PACKAGE = threads::shared::tie
PROTOTYPES: DISABLE
+#ifdef USE_ITHREADS
void
PUSH(shared_sv *shared, ...)
sharedsv_scalar_store(aTHX_ tmp, target);
SHARED_CONTEXT;
av_push((AV*) SHAREDSvPTR(shared), SHAREDSvPTR(target));
+ SvREFCNT_inc(SHAREDSvPTR(target));
SHARED_RELEASE;
SvREFCNT_dec(tmp);
}
sharedsv_scalar_store(aTHX_ tmp, target);
SHARED_CONTEXT;
av_store((AV*) SHAREDSvPTR(shared), i - 1, SHAREDSvPTR(target));
+ SvREFCNT_inc(SHAREDSvPTR(target));
CALLER_CONTEXT;
SvREFCNT_dec(tmp);
}
SHARED_CONTEXT;
sv = av_pop((AV*)SHAREDSvPTR(shared));
CALLER_CONTEXT;
- ST(0) = Nullsv;
+ ST(0) = sv_newmortal();
Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
+ SvREFCNT_dec(sv);
LEAVE_LOCK;
XSRETURN(1);
SHARED_CONTEXT;
sv = av_shift((AV*)SHAREDSvPTR(shared));
CALLER_CONTEXT;
- ST(0) = Nullsv;
+ ST(0) = sv_newmortal();
Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
+ SvREFCNT_dec(sv);
LEAVE_LOCK;
XSRETURN(1);
CODE:
dTHXc;
bool exists;
- SHARED_EDIT;
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
+ SHARED_EDIT;
exists = av_exists((AV*) SHAREDSvPTR(shared), SvIV(index));
}
else {
STRLEN len;
char *key = SvPV(index,len);
+ SHARED_EDIT;
exists = hv_exists((HV*) SHAREDSvPTR(shared), key, len);
}
SHARED_RELEASE;
PROTOTYPE: \[$@%]
CODE:
shared_sv *shared;
+ ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
- if (shared = Perl_sharedsv_find(aTHX_ ref)) {
+ if( (shared = Perl_sharedsv_find(aTHX_ ref)) ){
ST(0) = sv_2mortal(newSViv(PTR2IV(shared)));
XSRETURN(1);
}
PROTOTYPE: \[$@%]
CODE:
shared_sv *shared;
+ ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
- if (shared = Perl_sharedsv_find(aTHX_ ref)) {
+ if( (shared = Perl_sharedsv_find(aTHX_ ref)) ){
if (SHAREDSvPTR(shared)) {
ST(0) = sv_2mortal(newSViv(SvREFCNT(SHAREDSvPTR(shared))));
XSRETURN(1);
}
else {
- Perl_warn(aTHX_ "%_ s=%p has no shared SV",ST(0),shared);
+ Perl_warn(aTHX_ "%" SVf " s=%p has no shared SV",ST(0),shared);
}
}
else {
- Perl_warn(aTHX_ "%_ is not shared",ST(0));
+ Perl_warn(aTHX_ "%" SVf " is not shared",ST(0));
}
XSRETURN_UNDEF;
-void
+SV*
share(SV *ref)
PROTOTYPE: \[$@%]
CODE:
+ if(!SvROK(ref))
+ Perl_croak(aTHX_ "Argument to share needs to be passed as ref");
+ ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
- Perl_sharedsv_share(aTHX, ref);
+ Perl_sharedsv_share(aTHX_ ref);
+ RETVAL = newRV(ref);
+ OUTPUT:
+ RETVAL
void
lock_enabled(SV *ref)
PROTOTYPE: \[$@%]
CODE:
shared_sv* shared;
+ if(!SvROK(ref))
+ Perl_croak(aTHX_ "Argument to lock needs to be passed as ref");
+ ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX, ref);
+ shared = Perl_sharedsv_find(aTHX_ ref);
if(!shared)
croak("lock can only be used on shared values");
Perl_sharedsv_lock(aTHX_ shared);
void
-cond_wait_enabled(SV *ref)
- PROTOTYPE: \[$@%]
- CODE:
+cond_wait_enabled(SV *ref_cond, SV *ref_lock = 0)
+ PROTOTYPE: \[$@%];\[$@%]
+ PREINIT:
shared_sv* shared;
+ perl_cond* user_condition;
int locks;
- if(SvROK(ref))
- ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX_ ref);
+ int same = 0;
+
+ CODE:
+ if (!ref_lock || ref_lock == ref_cond) same = 1;
+
+ if(!SvROK(ref_cond))
+ Perl_croak(aTHX_ "Argument to cond_wait needs to be passed as ref");
+ ref_cond = SvRV(ref_cond);
+ if(SvROK(ref_cond))
+ ref_cond = SvRV(ref_cond);
+ shared = Perl_sharedsv_find(aTHX_ ref_cond);
if(!shared)
croak("cond_wait can only be used on shared values");
+
+ user_condition = &shared->user_cond;
+ if (! same) {
+ if (!SvROK(ref_lock))
+ Perl_croak(aTHX_ "cond_wait lock needs to be passed as ref");
+ ref_lock = SvRV(ref_lock);
+ if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock);
+ shared = Perl_sharedsv_find(aTHX_ ref_lock);
+ if (!shared)
+ croak("cond_wait lock must be a shared value");
+ }
if(shared->lock.owner != aTHX)
croak("You need a lock before you can cond_wait");
/* Stealing the members of the lock object worries me - NI-S */
MUTEX_LOCK(&shared->lock.mutex);
shared->lock.owner = NULL;
- locks = shared->lock.locks = 0;
- COND_WAIT(&shared->user_cond, &shared->lock.mutex);
+ locks = shared->lock.locks;
+ shared->lock.locks = 0;
+
+ /* since we are releasing the lock here we need to tell other
+ people that is ok to go ahead and use it */
+ COND_SIGNAL(&shared->lock.cond);
+ COND_WAIT(user_condition, &shared->lock.mutex);
+ while(shared->lock.owner != NULL) {
+ /* OK -- must reacquire the lock */
+ COND_WAIT(&shared->lock.cond, &shared->lock.mutex);
+ }
shared->lock.owner = aTHX;
shared->lock.locks = locks;
MUTEX_UNLOCK(&shared->lock.mutex);
+int
+cond_timedwait_enabled(SV *ref_cond, double abs, SV *ref_lock = 0)
+ PROTOTYPE: \[$@%]$;\[$@%]
+ PREINIT:
+ shared_sv* shared;
+ perl_cond* user_condition;
+ int locks;
+ int same = 0;
+
+ CODE:
+ if (!ref_lock || ref_cond == ref_lock) same = 1;
+
+ if(!SvROK(ref_cond))
+ Perl_croak(aTHX_ "Argument to cond_timedwait needs to be passed as ref");
+ ref_cond = SvRV(ref_cond);
+ if(SvROK(ref_cond))
+ ref_cond = SvRV(ref_cond);
+ shared = Perl_sharedsv_find(aTHX_ ref_cond);
+ if(!shared)
+ croak("cond_timedwait can only be used on shared values");
+
+ user_condition = &shared->user_cond;
+ if (! same) {
+ if (!SvROK(ref_lock))
+ Perl_croak(aTHX_ "cond_timedwait lock needs to be passed as ref");
+ ref_lock = SvRV(ref_lock);
+ if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock);
+ shared = Perl_sharedsv_find(aTHX_ ref_lock);
+ if (!shared)
+ croak("cond_timedwait lock must be a shared value");
+ }
+ if(shared->lock.owner != aTHX)
+ croak("You need a lock before you can cond_wait");
+
+ MUTEX_LOCK(&shared->lock.mutex);
+ shared->lock.owner = NULL;
+ locks = shared->lock.locks;
+ shared->lock.locks = 0;
+ /* since we are releasing the lock here we need to tell other
+ people that is ok to go ahead and use it */
+ COND_SIGNAL(&shared->lock.cond);
+ RETVAL = Perl_sharedsv_cond_timedwait(user_condition, &shared->lock.mutex, abs);
+ while (shared->lock.owner != NULL) {
+ /* OK -- must reacquire the lock... */
+ COND_WAIT(&shared->lock.cond, &shared->lock.mutex);
+ }
+ shared->lock.owner = aTHX;
+ shared->lock.locks = locks;
+ MUTEX_UNLOCK(&shared->lock.mutex);
+
+ if (RETVAL == 0)
+ XSRETURN_UNDEF;
+ OUTPUT:
+ RETVAL
+
void
cond_signal_enabled(SV *ref)
PROTOTYPE: \[$@%]
CODE:
shared_sv* shared;
+ if(!SvROK(ref))
+ Perl_croak(aTHX_ "Argument to cond_signal needs to be passed as ref");
+ ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
shared = Perl_sharedsv_find(aTHX_ ref);
+ if (ckWARN(WARN_THREADS) && shared->lock.owner != aTHX)
+ Perl_warner(aTHX_ packWARN(WARN_THREADS),
+ "cond_signal() called on unlocked variable");
if(!shared)
croak("cond_signal can only be used on shared values");
COND_SIGNAL(&shared->user_cond);
PROTOTYPE: \[$@%]
CODE:
shared_sv* shared;
+ if(!SvROK(ref))
+ Perl_croak(aTHX_ "Argument to cond_broadcast needs to be passed as ref");
+ ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
shared = Perl_sharedsv_find(aTHX_ ref);
if(!shared)
croak("cond_broadcast can only be used on shared values");
+ if (ckWARN(WARN_THREADS) && shared->lock.owner != aTHX)
+ Perl_warner(aTHX_ packWARN(WARN_THREADS),
+ "cond_broadcast() called on unlocked variable");
COND_BROADCAST(&shared->user_cond);
+
+SV*
+bless(SV* ref, ...);
+ PROTOTYPE: $;$
+ CODE:
+ {
+ HV* stash;
+ shared_sv* shared;
+ if (items == 1)
+ stash = CopSTASH(PL_curcop);
+ else {
+ SV* ssv = ST(1);
+ STRLEN len;
+ char *ptr;
+
+ if (ssv && !SvGMAGICAL(ssv) && !SvAMAGIC(ssv) && SvROK(ssv))
+ Perl_croak(aTHX_ "Attempt to bless into a reference");
+ ptr = SvPV(ssv,len);
+ if (ckWARN(WARN_MISC) && len == 0)
+ Perl_warner(aTHX_ packWARN(WARN_MISC),
+ "Explicit blessing to '' (assuming package main)");
+ stash = gv_stashpvn(ptr, len, TRUE);
+ }
+ SvREFCNT_inc(ref);
+ (void)sv_bless(ref, stash);
+ RETVAL = ref;
+ shared = Perl_sharedsv_find(aTHX_ ref);
+ if(shared) {
+ dTHXc;
+ ENTER_LOCK;
+ SHARED_CONTEXT;
+ {
+ SV* fake_stash = newSVpv(HvNAME(stash),0);
+ (void)sv_bless(SHAREDSvPTR(shared),(HV*)fake_stash);
+ }
+ CALLER_CONTEXT;
+ LEAVE_LOCK;
+ }
+ }
+ OUTPUT:
+ RETVAL
+
+#endif /* USE_ITHREADS */
+
BOOT:
{
+#ifdef USE_ITHREADS
Perl_sharedsv_init(aTHX);
+#endif /* USE_ITHREADS */
}
+
+
+
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