/* shared.xs
*
* 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.
*
* "Hand any two wizards a piece of rope and they would instinctively pull in
* opposite directions."
* --Sourcery
*
* Contributed by Arthur Bergman [email protected]
* pulled in the (an)other direction by Nick Ing-Simmons [email protected]
*/
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifdef USE_ITHREADS
#define SHAREDSvPTR(a) ((a)->sv)
/*
* The shared things need an intepreter to live in ...
*/
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))
/* 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))
/*
* Only one thread at a time is allowed to mess with shared space.
*/
typedef struct
{
perl_mutex mutex;
PerlInterpreter *owner;
I32 locks;
perl_cond cond;
#ifdef DEBUG_LOCKS
char * file;
int line;
#endif
} recursive_lock_t;
recursive_lock_t PL_sharedsv_lock; /* Mutex protecting the shared sv space */
void
recursive_lock_init(pTHX_ recursive_lock_t *lock)
{
Zero(lock,1,recursive_lock_t);
MUTEX_INIT(&lock->mutex);
COND_INIT(&lock->cond);
}
void
recursive_lock_release(pTHX_ recursive_lock_t *lock)
{
MUTEX_LOCK(&lock->mutex);
if (lock->owner != aTHX) {
MUTEX_UNLOCK(&lock->mutex);
}
else {
if (--lock->locks == 0) {
lock->owner = NULL;
COND_SIGNAL(&lock->cond);
}
}
MUTEX_UNLOCK(&lock->mutex);
}
void
recursive_lock_acquire(pTHX_ recursive_lock_t *lock,char *file,int line)
{
assert(aTHX);
MUTEX_LOCK(&lock->mutex);
if (lock->owner == aTHX) {
lock->locks++;
}
else {
while (lock->owner) {
#ifdef DEBUG_LOCKS
Perl_warn(aTHX_ " %p waiting - owned by %p %s:%d\n",
aTHX, lock->owner, lock->file, lock->line);
#endif
COND_WAIT(&lock->cond,&lock->mutex);
}
lock->locks = 1;
lock->owner = aTHX;
#ifdef DEBUG_LOCKS
lock->file = file;
lock->line = line;
#endif
}
MUTEX_UNLOCK(&lock->mutex);
SAVEDESTRUCTOR_X(recursive_lock_release,lock);
}
#define ENTER_LOCK STMT_START { \
ENTER; \
recursive_lock_acquire(aTHX_ &PL_sharedsv_lock, __FILE__, __LINE__); \
} STMT_END
#define LEAVE_LOCK LEAVE
/* A common idiom is to acquire access and switch in ... */
#define SHARED_EDIT STMT_START { \
ENTER_LOCK; \
SHARED_CONTEXT; \
} STMT_END
/* then switch out and release access. */
#define SHARED_RELEASE STMT_START { \
CALLER_CONTEXT; \
LEAVE_LOCK; \
} STMT_END
/*
Shared SV
Shared SV is a structure for keeping the backend storage
of shared svs.
Shared-ness really only needs the SV * - the rest is for locks.
(Which suggests further space optimization ... )
*/
typedef struct {
SV *sv; /* The actual SV - in shared space */
recursive_lock_t lock;
perl_cond user_cond; /* For user-level conditions */
} shared_sv;
/* The SV in shared-space has a back-pointer to the shared_sv
struct associated with it PERL_MAGIC_ext.
The vtable used has just one entry - when the SV goes away
we free the memory for the above.
*/
int
sharedsv_shared_mg_free(pTHX_ SV *sv, MAGIC *mg)
{
shared_sv *shared = (shared_sv *) mg->mg_ptr;
assert( aTHX == PL_sharedsv_space );
if (shared) {
PerlMemShared_free(shared);
mg->mg_ptr = NULL;
}
return 0;
}
MGVTBL sharedsv_shared_vtbl = {
0, /* get */
0, /* set */
0, /* len */
0, /* clear */
sharedsv_shared_mg_free, /* free */
0, /* copy */
0, /* dup */
};
/* Access to shared things is heavily based on MAGIC - in mg.h/mg.c/sv.c sense */
/* In any thread that has access to a shared thing there is a "proxy"
for it in its own space which has 'MAGIC' associated which accesses
the shared thing.
*/
MGVTBL sharedsv_scalar_vtbl; /* scalars have this vtable */
MGVTBL sharedsv_array_vtbl; /* hashes and arrays have this - like 'tie' */
MGVTBL sharedsv_elem_vtbl; /* elements of hashes and arrays have this
_AS WELL AS_ the scalar magic */
/* The sharedsv_elem_vtbl associates the element with the array/hash and
the sharedsv_scalar_vtbl associates it with the value
*/
/* Accessor to convert threads::shared::tie objects back shared_sv * */
shared_sv *
SV_to_sharedsv(pTHX_ SV *sv)
{
shared_sv *shared = 0;
if (SvROK(sv))
{
shared = INT2PTR(shared_sv *, SvIV(SvRV(sv)));
}
return shared;
}
=for apidoc sharedsv_find
Given a private side SV tries to find if the SV has a shared backend,
by looking for the magic.
=cut
shared_sv *
Perl_sharedsv_find(pTHX_ SV *sv)
{
MAGIC *mg;
if (SvTYPE(sv) >= SVt_PVMG) {
switch(SvTYPE(sv)) {
case SVt_PVAV:
case SVt_PVHV:
if ((mg = mg_find(sv, PERL_MAGIC_tied))
&& mg->mg_virtual == &sharedsv_array_vtbl) {
return (shared_sv *) mg->mg_ptr;
}
break;
default:
/* This should work for elements as well as they
* have scalar magic as well as their element magic
*/
if ((mg = mg_find(sv, PERL_MAGIC_shared_scalar))
&& mg->mg_virtual == &sharedsv_scalar_vtbl) {
return (shared_sv *) mg->mg_ptr;
}
break;
}
}
/* Just for tidyness of API also handle tie objects */
if (SvROK(sv) && sv_derived_from(sv, "threads::shared::tie")) {
return SV_to_sharedsv(aTHX_ sv);
}
return NULL;
}
/*
* Almost all the pain is in this routine.
*
*/
shared_sv *
Perl_sharedsv_associate(pTHX_ SV **psv, SV *ssv, shared_sv *data)
{
dTHXc;
MAGIC *mg = 0;
SV *sv = (psv) ? *psv : Nullsv;
/* If we are asked for an private ops we need a thread */
assert ( aTHX != PL_sharedsv_space );
/* To avoid need for recursive locks require caller to hold lock */
assert ( PL_sharedsv_lock.owner == aTHX );
/* First try and get existing global data structure */
/* Try shared SV as 1st choice */
if (!data && ssv && SvTYPE(ssv) >= SVt_PVMG) {
if( (mg = mg_find(ssv, PERL_MAGIC_ext)) ){
data = (shared_sv *) mg->mg_ptr;
}
}
/* Next see if private SV is associated with something */
if (!data && sv) {
data = Perl_sharedsv_find(aTHX_ sv);
}
/* If neither of those then create a new one */
if (!data) {
SHARED_CONTEXT;
if (!ssv)
ssv = newSV(0);
data = PerlMemShared_malloc(sizeof(shared_sv));
Zero(data,1,shared_sv);
SHAREDSvPTR(data) = ssv;
/* Tag shared side SV with data pointer */
sv_magicext(ssv, ssv, PERL_MAGIC_ext, &sharedsv_shared_vtbl,
(char *)data, 0);
recursive_lock_init(aTHX_ &data->lock);
COND_INIT(&data->user_cond);
CALLER_CONTEXT;
}
if (!ssv)
ssv = SHAREDSvPTR(data);
if (!SHAREDSvPTR(data))
SHAREDSvPTR(data) = ssv;
/* If we know type upgrade shared side SV */
if (sv && SvTYPE(ssv) < SvTYPE(sv)) {
SHARED_CONTEXT;
sv_upgrade(ssv, SvTYPE(*psv));
CALLER_CONTEXT;
}
/* Now if requested allocate private SV */
if (psv && !sv) {
*psv = sv = newSV(0);
}
/* Finally if private SV exists check and add magic */
if (sv) {
MAGIC *mg = 0;
if (SvTYPE(sv) < SvTYPE(ssv)) {
sv_upgrade(sv, SvTYPE(ssv));
}
switch(SvTYPE(sv)) {
case SVt_PVAV:
case SVt_PVHV:
if (!(mg = mg_find(sv, PERL_MAGIC_tied))
|| mg->mg_virtual != &sharedsv_array_vtbl
|| (shared_sv *) mg->mg_ptr != data) {
SV *obj = newSV(0);
sv_setref_iv(obj, "threads::shared::tie",PTR2IV(data));
if (mg) {
sv_unmagic(sv, PERL_MAGIC_tied);
}
mg = sv_magicext(sv, obj, PERL_MAGIC_tied, &sharedsv_array_vtbl,
(char *) data, 0);
mg->mg_flags |= (MGf_COPY|MGf_DUP);
SvREFCNT_inc(ssv);
SvREFCNT_dec(obj);
}
break;
default:
if ((SvTYPE(sv) < SVt_PVMG)
|| !(mg = mg_find(sv, PERL_MAGIC_shared_scalar))
|| mg->mg_virtual != &sharedsv_scalar_vtbl
|| (shared_sv *) mg->mg_ptr != data) {
if (mg) {
sv_unmagic(sv, PERL_MAGIC_shared_scalar);
}
mg = sv_magicext(sv, Nullsv, PERL_MAGIC_shared_scalar,
&sharedsv_scalar_vtbl, (char *)data, 0);
mg->mg_flags |= (MGf_COPY|MGf_DUP);
SvREFCNT_inc(ssv);
}
break;
}
assert ( Perl_sharedsv_find(aTHX_ *psv) == data );
}
return data;
}
void
Perl_sharedsv_free(pTHX_ shared_sv *shared)
{
if (shared) {
dTHXc;
SHARED_EDIT;
SvREFCNT_dec(SHAREDSvPTR(shared));
SHARED_RELEASE;
}
}
void
Perl_sharedsv_share(pTHX_ SV *sv)
{
switch(SvTYPE(sv)) {
case SVt_PVGV:
Perl_croak(aTHX_ "Cannot share globs yet");
break;
case SVt_PVCV:
Perl_croak(aTHX_ "Cannot share subs yet");
break;
default:
ENTER_LOCK;
Perl_sharedsv_associate(aTHX_ &sv, 0, 0);
LEAVE_LOCK;
SvSETMAGIC(sv);
break;
}
}
/* MAGIC (in mg.h sense) hooks */
int
sharedsv_scalar_mg_get(pTHX_ SV *sv, MAGIC *mg)
{
shared_sv *shared = (shared_sv *) mg->mg_ptr;
assert(shared);
ENTER_LOCK;
if (SHAREDSvPTR(shared)) {
if (SvROK(SHAREDSvPTR(shared))) {
SV *obj = Nullsv;
Perl_sharedsv_associate(aTHX_ &obj, SvRV(SHAREDSvPTR(shared)), NULL);
sv_setsv_nomg(sv, &PL_sv_undef);
SvRV(sv) = obj;
SvROK_on(sv);
}
else {
sv_setsv_nomg(sv, SHAREDSvPTR(shared));
}
}
LEAVE_LOCK;
return 0;
}
void
sharedsv_scalar_store(pTHX_ SV *sv, shared_sv *shared)
{
dTHXc;
bool allowed = TRUE;
if (SvROK(sv)) {
shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(sv));
if (target) {
SV *tmp;
SHARED_CONTEXT;
tmp = newRV(SHAREDSvPTR(target));
sv_setsv_nomg(SHAREDSvPTR(shared), tmp);
SvREFCNT_dec(tmp);
CALLER_CONTEXT;
}
else {
allowed = FALSE;
}
}
else {
SvTEMP_off(sv);
SHARED_CONTEXT;
sv_setsv_nomg(SHAREDSvPTR(shared), sv);
CALLER_CONTEXT;
}
if (!allowed) {
Perl_croak(aTHX_ "Invalid value for shared scalar");
}
}
int
sharedsv_scalar_mg_set(pTHX_ SV *sv, MAGIC *mg)
{
shared_sv *shared;
ENTER_LOCK;
/* We call associate to potentially upgrade shared side SV */
shared = Perl_sharedsv_associate(aTHX_ &sv, Nullsv, (shared_sv *) mg->mg_ptr);
assert(shared);
sharedsv_scalar_store(aTHX_ sv, shared);
LEAVE_LOCK;
return 0;
}
int
sharedsv_scalar_mg_free(pTHX_ SV *sv, MAGIC *mg)
{
shared_sv *shared = (shared_sv *) mg->mg_ptr;
#if 0
assert (SvREFCNT(SHAREDSvPTR(shared)) < 1000);
#endif
Perl_sharedsv_free(aTHX_ shared);
return 0;
}
int
sharedsv_scalar_mg_clear(pTHX_ SV *sv, MAGIC *mg)
{
return 0;
}
/*
* Called during cloning of new threads
*/
int
sharedsv_scalar_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
{
shared_sv *shared = (shared_sv *) mg->mg_ptr;
if (shared) {
SvREFCNT_inc(SHAREDSvPTR(shared));
}
return 0;
}
MGVTBL sharedsv_scalar_vtbl = {
sharedsv_scalar_mg_get, /* get */
sharedsv_scalar_mg_set, /* set */
0, /* len */
sharedsv_scalar_mg_clear, /* clear */
sharedsv_scalar_mg_free, /* free */
0, /* copy */
sharedsv_scalar_mg_dup /* dup */
};
/* Now the arrays/hashes stuff */
int
sharedsv_elem_mg_FETCH(pTHX_ SV *sv, MAGIC *mg)
{
dTHXc;
shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
shared_sv *target = Perl_sharedsv_find(aTHX_ sv);
SV** svp;
assert ( shared );
assert ( SHAREDSvPTR(shared) );
ENTER_LOCK;
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
assert ( mg->mg_ptr == 0 );
SHARED_CONTEXT;
svp = av_fetch((AV*) SHAREDSvPTR(shared), mg->mg_len, 0);
}
else {
char *key = mg->mg_ptr;
STRLEN len = mg->mg_len;
assert ( mg->mg_ptr != 0 );
if (mg->mg_len == HEf_SVKEY) {
key = SvPV((SV *) mg->mg_ptr, len);
}
SHARED_CONTEXT;
svp = hv_fetch((HV*) SHAREDSvPTR(shared), key, len, 0);
}
CALLER_CONTEXT;
if (svp) {
/* Exists in the array */
target = Perl_sharedsv_associate(aTHX_ &sv, *svp, target);
sv_setsv(sv, *svp);
}
else {
/* Not in the array */
sv_setsv(sv, &PL_sv_undef);
}
LEAVE_LOCK;
return 0;
}
int
sharedsv_elem_mg_STORE(pTHX_ SV *sv, MAGIC *mg)
{
dTHXc;
shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
shared_sv *target;
SV **svp;
/* Theory - SV itself is magically shared - and we have ordered the
magic such that by the time we get here it has been stored
to its shared counterpart
*/
ENTER_LOCK;
assert(shared);
assert(SHAREDSvPTR(shared));
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
assert ( mg->mg_ptr == 0 );
SHARED_CONTEXT;
svp = av_fetch((AV*) SHAREDSvPTR(shared), mg->mg_len, 1);
}
else {
char *key = mg->mg_ptr;
STRLEN len = mg->mg_len;
assert ( mg->mg_ptr != 0 );
if (mg->mg_len == HEf_SVKEY)
key = SvPV((SV *) mg->mg_ptr, len);
SHARED_CONTEXT;
svp = hv_fetch((HV*) SHAREDSvPTR(shared), key, len, 1);
}
CALLER_CONTEXT;
target = Perl_sharedsv_associate(aTHX_ &sv, *svp, 0);
sharedsv_scalar_store(aTHX_ sv, target);
LEAVE_LOCK;
return 0;
}
int
sharedsv_elem_mg_DELETE(pTHX_ SV *sv, MAGIC *mg)
{
dTHXc;
shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
ENTER_LOCK;
sharedsv_elem_mg_FETCH(aTHX_ sv, mg);
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
SHARED_CONTEXT;
av_delete((AV*) SHAREDSvPTR(shared), mg->mg_len, G_DISCARD);
}
else {
char *key = mg->mg_ptr;
STRLEN len = mg->mg_len;
assert ( mg->mg_ptr != 0 );
if (mg->mg_len == HEf_SVKEY)
key = SvPV((SV *) mg->mg_ptr, len);
SHARED_CONTEXT;
hv_delete((HV*) SHAREDSvPTR(shared), key, len, G_DISCARD);
}
CALLER_CONTEXT;
LEAVE_LOCK;
return 0;
}
int
sharedsv_elem_mg_free(pTHX_ SV *sv, MAGIC *mg)
{
Perl_sharedsv_free(aTHX_ SV_to_sharedsv(aTHX_ mg->mg_obj));
return 0;
}
int
sharedsv_elem_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
{
shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
SvREFCNT_inc(SHAREDSvPTR(shared));
mg->mg_flags |= MGf_DUP;
return 0;
}
MGVTBL sharedsv_elem_vtbl = {
sharedsv_elem_mg_FETCH, /* get */
sharedsv_elem_mg_STORE, /* set */
0, /* len */
sharedsv_elem_mg_DELETE, /* clear */
sharedsv_elem_mg_free, /* free */
0, /* copy */
sharedsv_elem_mg_dup /* dup */
};
U32
sharedsv_array_mg_FETCHSIZE(pTHX_ SV *sv, MAGIC *mg)
{
dTHXc;
shared_sv *shared = (shared_sv *) mg->mg_ptr;
U32 val;
SHARED_EDIT;
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
val = av_len((AV*) SHAREDSvPTR(shared));
}
else {
/* not actually defined by tie API but ... */
val = HvKEYS((HV*) SHAREDSvPTR(shared));
}
SHARED_RELEASE;
return val;
}
int
sharedsv_array_mg_CLEAR(pTHX_ SV *sv, MAGIC *mg)
{
dTHXc;
shared_sv *shared = (shared_sv *) mg->mg_ptr;
SHARED_EDIT;
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
av_clear((AV*) SHAREDSvPTR(shared));
}
else {
hv_clear((HV*) SHAREDSvPTR(shared));
}
SHARED_RELEASE;
return 0;
}
int
sharedsv_array_mg_free(pTHX_ SV *sv, MAGIC *mg)
{
Perl_sharedsv_free(aTHX_ (shared_sv *) mg->mg_ptr);
return 0;
}
/*
* This is called when perl is about to access an element of
* the array -
*/
int
sharedsv_array_mg_copy(pTHX_ SV *sv, MAGIC* mg,
SV *nsv, const char *name, int namlen)
{
shared_sv *shared = (shared_sv *) mg->mg_ptr;
MAGIC *nmg = sv_magicext(nsv,mg->mg_obj,
toLOWER(mg->mg_type),&sharedsv_elem_vtbl,
name, namlen);
SvREFCNT_inc(SHAREDSvPTR(shared));
nmg->mg_flags |= MGf_DUP;
return 1;
}
int
sharedsv_array_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
{
shared_sv *shared = (shared_sv *) mg->mg_ptr;
SvREFCNT_inc(SHAREDSvPTR(shared));
mg->mg_flags |= MGf_DUP;
return 0;
}
MGVTBL sharedsv_array_vtbl = {
0, /* get */
0, /* set */
sharedsv_array_mg_FETCHSIZE, /* len */
sharedsv_array_mg_CLEAR, /* clear */
sharedsv_array_mg_free, /* free */
sharedsv_array_mg_copy, /* copy */
sharedsv_array_mg_dup /* dup */
};
=for apidoc sharedsv_unlock
Recursively unlocks a shared sv.
=cut
void
Perl_sharedsv_unlock(pTHX_ shared_sv* ssv)
{
recursive_lock_release(aTHX_ &ssv->lock);
}
=for apidoc sharedsv_lock
Recursive locks on a sharedsv.
Locks are dynamically scoped at the level of the first lock.
=cut
void
Perl_sharedsv_lock(pTHX_ shared_sv* ssv)
{
if (!ssv)
return;
recursive_lock_acquire(aTHX_ &ssv->lock, __FILE__, __LINE__);
}
/* handles calls from lock() builtin via PL_lockhook */
void
Perl_sharedsv_locksv(pTHX_ SV *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,
=cut
void
Perl_sharedsv_init(pTHX)
{
dTHXc;
/* This pair leaves us in shared context ... */
PL_sharedsv_space = perl_alloc();
perl_construct(PL_sharedsv_space);
CALLER_CONTEXT;
recursive_lock_init(aTHX_ &PL_sharedsv_lock);
PL_lockhook = &Perl_sharedsv_locksv;
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, ...)
CODE:
dTHXc;
int i;
for(i = 1; i < items; i++) {
SV* tmp = newSVsv(ST(i));
shared_sv *target;
ENTER_LOCK;
target = Perl_sharedsv_associate(aTHX_ &tmp, Nullsv, 0);
sharedsv_scalar_store(aTHX_ tmp, target);
SHARED_CONTEXT;
av_push((AV*) SHAREDSvPTR(shared), SHAREDSvPTR(target));
SHARED_RELEASE;
SvREFCNT_dec(tmp);
}
void
UNSHIFT(shared_sv *shared, ...)
CODE:
dTHXc;
int i;
ENTER_LOCK;
SHARED_CONTEXT;
av_unshift((AV*)SHAREDSvPTR(shared), items - 1);
CALLER_CONTEXT;
for(i = 1; i < items; i++) {
SV* tmp = newSVsv(ST(i));
shared_sv *target = Perl_sharedsv_associate(aTHX_ &tmp, Nullsv, 0);
sharedsv_scalar_store(aTHX_ tmp, target);
SHARED_CONTEXT;
av_store((AV*) SHAREDSvPTR(shared), i - 1, SHAREDSvPTR(target));
CALLER_CONTEXT;
SvREFCNT_dec(tmp);
}
LEAVE_LOCK;
void
POP(shared_sv *shared)
CODE:
dTHXc;
SV* sv;
ENTER_LOCK;
SHARED_CONTEXT;
sv = av_pop((AV*)SHAREDSvPTR(shared));
CALLER_CONTEXT;
ST(0) = Nullsv;
Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
LEAVE_LOCK;
XSRETURN(1);
void
SHIFT(shared_sv *shared)
CODE:
dTHXc;
SV* sv;
ENTER_LOCK;
SHARED_CONTEXT;
sv = av_shift((AV*)SHAREDSvPTR(shared));
CALLER_CONTEXT;
ST(0) = Nullsv;
Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
LEAVE_LOCK;
XSRETURN(1);
void
EXTEND(shared_sv *shared, IV count)
CODE:
dTHXc;
SHARED_EDIT;
av_extend((AV*)SHAREDSvPTR(shared), count);
SHARED_RELEASE;
void
STORESIZE(shared_sv *shared,IV count)
CODE:
dTHXc;
SHARED_EDIT;
av_fill((AV*) SHAREDSvPTR(shared), count);
SHARED_RELEASE;
void
EXISTS(shared_sv *shared, SV *index)
CODE:
dTHXc;
bool exists;
SHARED_EDIT;
if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
exists = av_exists((AV*) SHAREDSvPTR(shared), SvIV(index));
}
else {
STRLEN len;
char *key = SvPV(index,len);
exists = hv_exists((HV*) SHAREDSvPTR(shared), key, len);
}
SHARED_RELEASE;
ST(0) = (exists) ? &PL_sv_yes : &PL_sv_no;
XSRETURN(1);
void
FIRSTKEY(shared_sv *shared)
CODE:
dTHXc;
char* key = NULL;
I32 len = 0;
HE* entry;
ENTER_LOCK;
SHARED_CONTEXT;
hv_iterinit((HV*) SHAREDSvPTR(shared));
entry = hv_iternext((HV*) SHAREDSvPTR(shared));
if (entry) {
key = hv_iterkey(entry,&len);
CALLER_CONTEXT;
ST(0) = sv_2mortal(newSVpv(key, len));
} else {
CALLER_CONTEXT;
ST(0) = &PL_sv_undef;
}
LEAVE_LOCK;
XSRETURN(1);
void
NEXTKEY(shared_sv *shared, SV *oldkey)
CODE:
dTHXc;
char* key = NULL;
I32 len = 0;
HE* entry;
ENTER_LOCK;
SHARED_CONTEXT;
entry = hv_iternext((HV*) SHAREDSvPTR(shared));
if (entry) {
key = hv_iterkey(entry,&len);
CALLER_CONTEXT;
ST(0) = sv_2mortal(newSVpv(key, len));
} else {
CALLER_CONTEXT;
ST(0) = &PL_sv_undef;
}
LEAVE_LOCK;
XSRETURN(1);
MODULE = threads::shared PACKAGE = threads::shared
PROTOTYPES: ENABLE
void
_id(SV *ref)
PROTOTYPE: \[$@%]
CODE:
shared_sv *shared;
ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
if( (shared = Perl_sharedsv_find(aTHX_ ref)) ){
ST(0) = sv_2mortal(newSViv(PTR2IV(shared)));
XSRETURN(1);
}
XSRETURN_UNDEF;
void
_refcnt(SV *ref)
PROTOTYPE: \[$@%]
CODE:
shared_sv *shared;
ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(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_ "%" SVf " s=%p has no shared SV",ST(0),shared);
}
}
else {
Perl_warn(aTHX_ "%" SVf " is not shared",ST(0));
}
XSRETURN_UNDEF;
SV*
share(SV *ref)
PROTOTYPE: \[$@%]
CODE:
ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
Perl_sharedsv_share(aTHX_ ref);
RETVAL = newRV(ref);
OUTPUT:
RETVAL
void
lock_enabled(SV *ref)
PROTOTYPE: \[$@%]
CODE:
shared_sv* shared;
ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(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:
shared_sv* shared;
int locks;
ref = SvRV(ref);
if(SvROK(ref))
ref = SvRV(ref);
shared = Perl_sharedsv_find(aTHX_ ref);
if(!shared)
croak("cond_wait can only be used on shared values");
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;
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(&shared->user_cond, &shared->lock.mutex);
while(shared->lock.owner != NULL) {
COND_WAIT(&shared->lock.cond,&shared->lock.mutex);
}
shared->lock.owner = aTHX;
shared->lock.locks = locks;
MUTEX_UNLOCK(&shared->lock.mutex);
void
cond_signal_enabled(SV *ref)
PROTOTYPE: \[$@%]
CODE:
shared_sv* shared;
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);
void
cond_broadcast_enabled(SV *ref)
PROTOTYPE: \[$@%]
CODE:
shared_sv* shared;
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);
#endif /* USE_ITHREADS */
BOOT:
{
#ifdef USE_ITHREADS
Perl_sharedsv_init(aTHX);
#endif /* USE_ITHREADS */
}
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