-/* sharedsv.c
+/* shared.xs
*
- * Copyright (c) 2001, Larry Wall
+ * Copyright (c) 2001-2002, 2006 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 Artur Bergman <sky AT crucially DOT net>
+ * Pulled in the (an)other direction by Nick Ing-Simmons
+ * <nick AT ing-simmons DOT net>
+ * CPAN version produced by Jerry D. Hedden <jdhedden AT cpan DOT org>
*/
/*
-* Contributed by Arthur Bergman arthur@contiller.se
-*
-* "Hand any two wizards a piece of rope and they would instinctively pull in
-* opposite directions."
-* --Sourcery
-*
-*/
+ * Shared variables are implemented by a scheme similar to tieing.
+ * Each thread has a proxy SV with attached magic -- "private SVs" --
+ * which all point to a single SV in a separate shared interpreter
+ * (PL_sharedsv_space) -- "shared SVs".
+ *
+ * The shared SV holds the variable's true values, and its state is
+ * copied between the shared and private SVs with the usual
+ * mg_get()/mg_set() arrangement.
+ *
+ * Aggregates (AVs and HVs) are implemented using tie magic, except that
+ * the vtable used is one defined in this file rather than the standard one.
+ * This means that where a tie function like FETCH is normally invoked by
+ * the tie magic's mg_get() function, we completely bypass the calling of a
+ * perl-level function, and directly call C-level code to handle it. On
+ * the other hand, calls to functions like PUSH are done directly by code
+ * in av.c, etc., which we can't bypass. So the best we can do is to provide
+ * XS versions of these functions. We also have to attach a tie object,
+ * blessed into the class threads::shared::tie, to keep the method-calling
+ * code happy.
+ *
+ * Access to aggregate elements is done the usual tied way by returning a
+ * proxy PVLV element with attached element magic.
+ *
+ * Pointers to the shared SV are squirrelled away in the mg->mg_ptr field
+ * of magic (with mg_len == 0), and in the IV2PTR(SvIV(sv)) field of tied
+ * object SVs. These pointers have to be hidden like this because they
+ * cross interpreter boundaries, and we don't want sv_clear() and friends
+ * following them.
+ *
+ * The three basic shared types look like the following:
+ *
+ * -----------------
+ *
+ * Shared scalar (my $s : shared):
+ *
+ * SV = PVMG(0x7ba238) at 0x7387a8
+ * FLAGS = (PADMY,GMG,SMG)
+ * MAGIC = 0x824d88
+ * MG_TYPE = PERL_MAGIC_shared_scalar(n)
+ * MG_PTR = 0x810358 <<<< pointer to the shared SV
+ *
+ * -----------------
+ *
+ * Shared aggregate (my @a : shared; my %h : shared):
+ *
+ * SV = PVAV(0x7175d0) at 0x738708
+ * FLAGS = (PADMY,RMG)
+ * MAGIC = 0x824e48
+ * MG_TYPE = PERL_MAGIC_tied(P)
+ * MG_OBJ = 0x7136e0 <<<< ref to the tied object
+ * SV = RV(0x7136f0) at 0x7136e0
+ * RV = 0x738640
+ * SV = PVMG(0x7ba238) at 0x738640 <<<< the tied object
+ * FLAGS = (OBJECT,IOK,pIOK)
+ * IV = 8455000 <<<< pointer to the shared AV
+ * STASH = 0x80abf0 "threads::shared::tie"
+ * MG_PTR = 0x810358 "" <<<< another pointer to the shared AV
+ * ARRAY = 0x0
+ *
+ * -----------------
+ *
+ * Aggregate element (my @a : shared; $a[0])
+ *
+ * SV = PVLV(0x77f628) at 0x713550
+ * FLAGS = (GMG,SMG,RMG,pIOK)
+ * MAGIC = 0x72bd58
+ * MG_TYPE = PERL_MAGIC_shared_scalar(n)
+ * MG_PTR = 0x8103c0 "" <<<< pointer to the shared element
+ * MAGIC = 0x72bd18
+ * MG_TYPE = PERL_MAGIC_tiedelem(p)
+ * MG_OBJ = 0x7136e0 <<<< ref to the tied object
+ * SV = RV(0x7136f0) at 0x7136e0
+ * RV = 0x738660
+ * SV = PVMG(0x7ba278) at 0x738660 <<<< the tied object
+ * FLAGS = (OBJECT,IOK,pIOK)
+ * IV = 8455064 <<<< pointer to the shared AV
+ * STASH = 0x80ac30 "threads::shared::tie"
+ * TYPE = t
+ *
+ * Note that PERL_MAGIC_tiedelem(p) magic doesn't have a pointer to a
+ * shared SV in mg_ptr; instead this is used to store the hash key,
+ * if any, like normal tied elements. Note also that element SVs may have
+ * pointers to both the shared aggregate and the shared element.
+ *
+ *
+ * Userland locks:
+ *
+ * If a shared variable is used as a perl-level lock or condition
+ * variable, then PERL_MAGIC_ext magic is attached to the associated
+ * *shared* SV, whose mg_ptr field points to a malloc'ed structure
+ * containing the necessary mutexes and condition variables.
+ *
+ * Nomenclature:
+ *
+ * In this file, any variable name prefixed with 's' (e.g., ssv, stmp or sobj)
+ * usually represents a shared SV which corresponds to a private SV named
+ * without the prefix (e.g., sv, tmp or obj).
+ */
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
+#ifdef HAS_PPPORT_H
+# define NEED_vnewSVpvf
+# define NEED_warner
+# include "ppport.h"
+# include "shared.h"
+#endif
-PerlInterpreter *PL_sharedsv_space; /* The shared sv space */
-perl_mutex PL_sharedsv_space_mutex; /* Mutex protecting the shared sv space */
+#ifdef USE_ITHREADS
-typedef struct {
- SV *sv; /* The actual SV */
- perl_mutex mutex; /* Our mutex */
- perl_cond cond; /* Our condition variable */
- perl_cond user_cond; /* For user-level conditions */
- IV locks; /* Number of locks held */
- PerlInterpreter *owner; /* Who owns the lock? */
- U16 index; /* Update index */
-} shared_sv;
-
-#define SHAREDSvGET(a) (a->sv)
-#define SHAREDSvLOCK(a) Perl_sharedsv_lock(aTHX_ a)
-#define SHAREDSvUNLOCK(a) Perl_sharedsv_unlock(aTHX_ a)
-
-#define SHAREDSvEDIT(a) STMT_START { \
- MUTEX_LOCK(&PL_sharedsv_space_mutex); \
- SHAREDSvLOCK((a)); \
- PERL_SET_CONTEXT(PL_sharedsv_space); \
- } STMT_END
-
-#define SHAREDSvRELEASE(a) STMT_START { \
- PERL_SET_CONTEXT((a)->owner); \
- SHAREDSvUNLOCK((a)); \
- MUTEX_UNLOCK(&PL_sharedsv_space_mutex); \
- } STMT_END
-
-extern void Perl_sharedsv_init(pTHX);
-extern shared_sv* Perl_sharedsv_new(pTHX);
-extern shared_sv* Perl_sharedsv_find(pTHX_ SV* sv);
-extern void Perl_sharedsv_lock(pTHX_ shared_sv* ssv);
-extern void Perl_sharedsv_unlock(pTHX_ shared_sv* ssv);
-extern void Perl_sharedsv_unlock_scope(pTHX_ shared_sv* ssv);
-extern void Perl_sharedsv_thrcnt_inc(pTHX_ shared_sv* ssv);
-extern void Perl_sharedsv_thrcnt_dec(pTHX_ shared_sv* ssv);
+/* Magic signature(s) for mg_private to make PERL_MAGIC_ext magic safer */
+#define UL_MAGIC_SIG 0x554C /* UL = user lock */
/*
- Shared 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 */
+
+/* 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 \
+ STMT_START { \
+ FREETMPS; \
+ LEAVE; \
+ PERL_SET_CONTEXT((aTHX = caller_perl)); \
+ } STMT_END
- Shared SV is a structure for keeping the backend storage
- of shared svs.
+/*
+ * 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);
+}
- =head1 Shared SV Functions
+void
+recursive_lock_destroy(pTHX_ recursive_lock_t *lock)
+{
+ MUTEX_DESTROY(&lock->mutex);
+ COND_DESTROY(&lock->cond);
+}
- =for apidoc sharedsv_init
+void
+recursive_lock_release(pTHX_ recursive_lock_t *lock)
+{
+ MUTEX_LOCK(&lock->mutex);
+ if (lock->owner == aTHX) {
+ 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
-Saves a space for keeping SVs wider than an interpreter,
-currently only stores a pointer to the first interpreter.
+/* The unlocking is done automatically at scope exit */
+#define LEAVE_LOCK LEAVE
- =cut
+/* 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
+
+
+/* User-level locks:
+ This structure is attached (using ext magic) to any shared SV that
+ is used by user-level locking or condition code
*/
-void
-Perl_sharedsv_init(pTHX)
+typedef struct {
+ recursive_lock_t lock; /* For user-levl locks */
+ perl_cond user_cond; /* For user-level conditions */
+} user_lock;
+
+/* Magic used for attaching user_lock structs to shared SVs
+
+ The vtable used has just one entry - when the SV goes away
+ we free the memory for the above.
+ */
+
+int
+sharedsv_userlock_free(pTHX_ SV *sv, MAGIC *mg)
{
- PerlInterpreter* old_context = PERL_GET_CONTEXT;
- PL_sharedsv_space = perl_alloc();
- perl_construct(PL_sharedsv_space);
- PERL_SET_CONTEXT(old_context);
- MUTEX_INIT(&PL_sharedsv_space_mutex);
+ user_lock *ul = (user_lock *) mg->mg_ptr;
+ assert(aTHX == PL_sharedsv_space);
+ if (ul) {
+ recursive_lock_destroy(aTHX_ &ul->lock);
+ COND_DESTROY(&ul->user_cond);
+ PerlMemShared_free(ul);
+ mg->mg_ptr = NULL;
+ }
+ return (0);
}
+MGVTBL sharedsv_userlock_vtbl = {
+ 0, /* get */
+ 0, /* set */
+ 0, /* len */
+ 0, /* clear */
+ sharedsv_userlock_free, /* free */
+ 0, /* copy */
+ 0, /* dup */
+#ifdef MGf_LOCAL
+ 0, /* local */
+#endif
+};
+
/*
- =for apidoc sharedsv_new
+ * 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.
+ */
+
+extern MGVTBL sharedsv_scalar_vtbl; /* Scalars have this vtable */
+extern MGVTBL sharedsv_array_vtbl; /* Hashes and arrays have this
+ - like 'tie' */
+extern 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
+ */
-Allocates a new shared sv struct, you must yourself create the SV/AV/HV.
- =cut
-*/
-shared_sv *
-Perl_sharedsv_new(pTHX)
+/* Get shared aggregate SV pointed to by threads::shared::tie magic object */
+
+STATIC SV *
+S_sharedsv_from_obj(pTHX_ SV *sv)
{
- shared_sv* ssv;
- New(2555,ssv,1,shared_sv);
- MUTEX_INIT(&ssv->mutex);
- COND_INIT(&ssv->cond);
- COND_INIT(&ssv->user_cond);
- ssv->owner = 0;
- ssv->locks = 0;
- ssv->index = 0;
- return ssv;
+ return ((SvROK(sv)) ? INT2PTR(SV *, SvIV(SvRV(sv))) : NULL);
}
-/*
- =for apidoc sharedsv_find
+/* Return the user_lock structure (if any) associated with a shared SV.
+ * If create is true, create one if it doesn't exist
+ */
+STATIC user_lock *
+S_get_userlock(pTHX_ SV* ssv, bool create)
+{
+ MAGIC *mg;
+ user_lock *ul = NULL;
+
+ assert(ssv);
+ /* XXX Redesign the storage of user locks so we don't need a global
+ * lock to access them ???? DAPM */
+ ENTER_LOCK;
+
+ /* Version of mg_find that also checks the private signature */
+ for (mg = SvMAGIC(ssv); mg; mg = mg->mg_moremagic) {
+ if ((mg->mg_type == PERL_MAGIC_ext) &&
+ (mg->mg_private == UL_MAGIC_SIG))
+ {
+ break;
+ }
+ }
-Tries to find if a given SV has a shared backend, either by
-looking at magic, or by checking if it is tied again threads::shared.
+ if (mg) {
+ ul = (user_lock*)(mg->mg_ptr);
+ } else if (create) {
+ dTHXc;
+ SHARED_CONTEXT;
+ ul = (user_lock *) PerlMemShared_malloc(sizeof(user_lock));
+ Zero(ul, 1, user_lock);
+ /* Attach to shared SV using ext magic */
+ mg = sv_magicext(ssv, NULL, PERL_MAGIC_ext, &sharedsv_userlock_vtbl,
+ (char *)ul, 0);
+ mg->mg_private = UL_MAGIC_SIG; /* Set private signature */
+ recursive_lock_init(aTHX_ &ul->lock);
+ COND_INIT(&ul->user_cond);
+ CALLER_CONTEXT;
+ }
+ LEAVE_LOCK;
+ return (ul);
+}
- =cut
-*/
-shared_sv *
-Perl_sharedsv_find(pTHX_ SV* sv)
+/* Given a private side SV tries to find if the SV has a shared backend,
+ * by looking for the magic.
+ */
+SV *
+Perl_sharedsv_find(pTHX_ SV *sv)
{
- /* does all it can to find a shared_sv struct, returns NULL otherwise */
- shared_sv* ssv = NULL;
- switch (SvTYPE(sv)) {
- case SVt_PVMG:
+ MAGIC *mg;
+ if (SvTYPE(sv) >= SVt_PVMG) {
+ switch(SvTYPE(sv)) {
case SVt_PVAV:
- case SVt_PVHV: {
- MAGIC* mg = mg_find(sv, PERL_MAGIC_ext);
- if(mg) {
- if(strcmp(mg->mg_ptr,"threads::shared"))
- break;
- ssv = INT2PTR(shared_sv *, SvIV(mg->mg_obj));
- break;
- }
-
- mg = mg_find(sv,PERL_MAGIC_tied);
- if(mg) {
- SV* obj = SvTIED_obj(sv,mg);
- if(sv_derived_from(obj, "threads::shared"))
- ssv = INT2PTR(shared_sv *, SvIV(SvRV(obj)));
- break;
- }
- }
+ case SVt_PVHV:
+ if ((mg = mg_find(sv, PERL_MAGIC_tied))
+ && mg->mg_virtual == &sharedsv_array_vtbl) {
+ return ((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 ((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 (S_sharedsv_from_obj(aTHX_ sv));
}
- return ssv;
+ return (NULL);
}
-/*
- =for apidoc sharedsv_lock
-Recursive locks on a sharedsv.
-Locks are dynamically scoped at the level of the first lock.
- =cut
-*/
+/* Associate a private SV with a shared SV by pointing the appropriate
+ * magics at it.
+ * Assumes lock is held.
+ */
void
-Perl_sharedsv_lock(pTHX_ shared_sv* ssv)
+Perl_sharedsv_associate(pTHX_ SV *sv, SV *ssv)
{
- if(!ssv)
- return;
- MUTEX_LOCK(&ssv->mutex);
- if(ssv->owner && ssv->owner == my_perl) {
- ssv->locks++;
- MUTEX_UNLOCK(&ssv->mutex);
- return;
+ MAGIC *mg = 0;
+
+ /* If we are asked for any 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 );
+
+ switch(SvTYPE(sv)) {
+ case SVt_PVAV:
+ case SVt_PVHV:
+ if (!(mg = mg_find(sv, PERL_MAGIC_tied))
+ || mg->mg_virtual != &sharedsv_array_vtbl
+ || (SV*) mg->mg_ptr != ssv)
+ {
+ SV *obj = newSV(0);
+ sv_setref_iv(obj, "threads::shared::tie", PTR2IV(ssv));
+ if (mg) {
+ sv_unmagic(sv, PERL_MAGIC_tied);
+ }
+ mg = sv_magicext(sv, obj, PERL_MAGIC_tied, &sharedsv_array_vtbl,
+ (char *)ssv, 0);
+ mg->mg_flags |= (MGf_COPY|MGf_DUP);
+ SvREFCNT_inc_void(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
+ || (SV*) mg->mg_ptr != ssv)
+ {
+ if (mg) {
+ sv_unmagic(sv, PERL_MAGIC_shared_scalar);
+ }
+ mg = sv_magicext(sv, Nullsv, PERL_MAGIC_shared_scalar,
+ &sharedsv_scalar_vtbl, (char *)ssv, 0);
+ mg->mg_flags |= (MGf_DUP
+#ifdef MGf_LOCAL
+ |MGf_LOCAL
+#endif
+ );
+ SvREFCNT_inc_void(ssv);
+ }
+ break;
}
- while(ssv->owner)
- COND_WAIT(&ssv->cond,&ssv->mutex);
- ssv->locks++;
- ssv->owner = my_perl;
- if(ssv->locks == 1)
- SAVEDESTRUCTOR_X(Perl_sharedsv_unlock_scope,ssv);
- MUTEX_UNLOCK(&ssv->mutex);
+
+ assert ( Perl_sharedsv_find(aTHX_ sv) == ssv );
}
-/*
- =for apidoc sharedsv_unlock
-Recursively unlocks a shared sv.
+/* Given a private SV, create and return an associated shared SV.
+ * Assumes lock is held.
+ */
+STATIC SV *
+S_sharedsv_new_shared(pTHX_ SV *sv)
+{
+ dTHXc;
+ SV *ssv;
+
+ assert(PL_sharedsv_lock.owner == aTHX);
+ assert(aTHX != PL_sharedsv_space);
+
+ SHARED_CONTEXT;
+ ssv = newSV(0);
+ SvREFCNT(ssv) = 0; /* Will be upped to 1 by Perl_sharedsv_associate */
+ sv_upgrade(ssv, SvTYPE(sv));
+ CALLER_CONTEXT;
+ Perl_sharedsv_associate(aTHX_ sv, ssv);
+ return (ssv);
+}
- =cut
-*/
-void
-Perl_sharedsv_unlock(pTHX_ shared_sv* ssv)
+/* Given a shared SV, create and return an associated private SV.
+ * Assumes lock is held.
+ */
+STATIC SV *
+S_sharedsv_new_private(pTHX_ SV *ssv)
{
- MUTEX_LOCK(&ssv->mutex);
- if(ssv->owner != my_perl) {
- Perl_croak(aTHX_ "panic: Perl_sharedsv_unlock unlocking mutex that we don't own");
- MUTEX_UNLOCK(&ssv->mutex);
+ SV *sv;
+
+ assert(PL_sharedsv_lock.owner == aTHX);
+ assert(aTHX != PL_sharedsv_space);
+
+ sv = newSV(0);
+ sv_upgrade(sv, SvTYPE(ssv));
+ Perl_sharedsv_associate(aTHX_ sv, ssv);
+ return (sv);
+}
+
+
+/* A threadsafe version of SvREFCNT_dec(ssv) */
+
+STATIC void
+S_sharedsv_dec(pTHX_ SV* ssv)
+{
+ if (! ssv)
return;
+ ENTER_LOCK;
+ if (SvREFCNT(ssv) > 1) {
+ /* No side effects, so can do it lightweight */
+ SvREFCNT_dec(ssv);
+ } else {
+ dTHXc;
+ SHARED_CONTEXT;
+ SvREFCNT_dec(ssv);
+ CALLER_CONTEXT;
}
+ LEAVE_LOCK;
+}
- if(--ssv->locks == 0) {
- ssv->owner = NULL;
- COND_SIGNAL(&ssv->cond);
- }
- MUTEX_UNLOCK(&ssv->mutex);
- }
+
+/* Implements Perl-level share() and :shared */
void
-Perl_sharedsv_unlock_scope(pTHX_ shared_sv* ssv)
+Perl_sharedsv_share(pTHX_ SV *sv)
{
- MUTEX_LOCK(&ssv->mutex);
- if(ssv->owner != my_perl) {
- MUTEX_UNLOCK(&ssv->mutex);
- return;
+ 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;
+ (void) S_sharedsv_new_shared(aTHX_ sv);
+ LEAVE_LOCK;
+ SvSETMAGIC(sv);
+ break;
}
- ssv->locks = 0;
- ssv->owner = NULL;
- COND_SIGNAL(&ssv->cond);
- MUTEX_UNLOCK(&ssv->mutex);
}
-/*
- =for apidoc sharedsv_thrcnt_inc
-Increments the threadcount of a sharedsv.
- =cut
-*/
-void
-Perl_sharedsv_thrcnt_inc(pTHX_ shared_sv* ssv)
+#ifdef WIN32
+/* Number of milliseconds from 1/1/1601 to 1/1/1970 */
+#define EPOCH_BIAS 11644473600000.
+
+/* Returns relative time in milliseconds. (Adapted from Time::HiRes.) */
+STATIC DWORD
+S_abs_2_rel_milli(double abs)
{
- SHAREDSvLOCK(ssv);
- SvREFCNT_inc(ssv->sv);
- SHAREDSvUNLOCK(ssv);
+ double rel;
+
+ /* Get current time (in units of 100 nanoseconds since 1/1/1601) */
+ union {
+ FILETIME ft;
+ __int64 i64; /* 'signed' to keep compilers happy */
+ } now;
+
+ GetSystemTimeAsFileTime(&now.ft);
+
+ /* Relative time in milliseconds */
+ rel = (abs * 1000.) - (((double)now.i64 / 10000.) - EPOCH_BIAS);
+ if (rel <= 0.0) {
+ return (0);
+ }
+ return (DWORD)rel;
}
-/*
- =for apidoc sharedsv_thrcnt_dec
+#else
+# if defined(OS2)
+# define ABS2RELMILLI(abs) \
+ do { \
+ abs -= (double)time(NULL); \
+ if (abs > 0) { abs *= 1000; } \
+ else { abs = 0; } \
+ } while (0)
+# endif /* OS2 */
+#endif /* WIN32 */
+
+/* Do OS-specific condition timed wait */
+
+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;
+
+ cond->waiters++;
+ MUTEX_UNLOCK(mut);
+ /* See comments in win32/win32thread.h COND_WAIT vis-a-vis race */
+ switch (WaitForSingleObject(cond->sem, S_abs_2_rel_milli(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;
+#ifdef OEMVS
+ case -1:
+ if (errno == ETIMEDOUT || errno == EAGAIN)
+ break;
+#endif
+ default:
+ Perl_croak_nocontext("panic: cond_timedwait");
+ break;
+ }
+ return (got_it);
+# endif /* OS2 */
+# endif /* WIN32 */
+#endif /* NETWARE || FAKE_THREADS || I_MACH_CTHREADS */
+}
-Decrements the threadcount of a shared sv. When a threads frontend is freed
-this function should be called.
- =cut
-*/
+/* Given a shared RV, copy it's value to a private RV, also copying the
+ * object status of the referent.
+ * If the private side is already an appropriate RV->SV combination, keep
+ * it if possible.
+ */
+STATIC void
+S_get_RV(pTHX_ SV *sv, SV *ssv) {
+ SV *sobj = SvRV(ssv);
+ SV *obj;
+ if (! (SvROK(sv) &&
+ ((obj = SvRV(sv))) &&
+ (Perl_sharedsv_find(aTHX_ obj) == sobj) &&
+ (SvTYPE(obj) == SvTYPE(sobj))))
+ {
+ /* Can't reuse obj */
+ if (SvROK(sv)) {
+ SvREFCNT_dec(SvRV(sv));
+ } else {
+ assert(SvTYPE(sv) >= SVt_RV);
+ sv_setsv_nomg(sv, &PL_sv_undef);
+ SvROK_on(sv);
+ }
+ obj = S_sharedsv_new_private(aTHX_ SvRV(ssv));
+ SvRV_set(sv, obj);
+ }
+ if (SvOBJECT(obj)) {
+ /* Remove any old blessing */
+ SvREFCNT_dec(SvSTASH(obj));
+ SvOBJECT_off(obj);
+ }
+ if (SvOBJECT(sobj)) {
+ /* Add any new old blessing */
+ STRLEN len;
+ char* stash_ptr = SvPV((SV*) SvSTASH(sobj), len);
+ HV* stash = gv_stashpvn(stash_ptr, len, TRUE);
+ SvOBJECT_on(obj);
+ SvSTASH_set(obj, (HV*)SvREFCNT_inc(stash));
+ }
+}
+
+
+/* ------------ PERL_MAGIC_shared_scalar(n) functions -------------- */
+
+/* Get magic for PERL_MAGIC_shared_scalar(n) */
+
+int
+sharedsv_scalar_mg_get(pTHX_ SV *sv, MAGIC *mg)
+{
+ SV *ssv = (SV *) mg->mg_ptr;
+ assert(ssv);
+
+ ENTER_LOCK;
+ if (SvROK(ssv)) {
+ S_get_RV(aTHX_ sv, ssv);
+ } else {
+ sv_setsv_nomg(sv, ssv);
+ }
+ LEAVE_LOCK;
+ return (0);
+}
+
+/* Copy the contents of a private SV to a shared SV.
+ * Used by various mg_set()-type functions.
+ * Assumes lock is held.
+ */
void
-Perl_sharedsv_thrcnt_dec(pTHX_ shared_sv* ssv)
+sharedsv_scalar_store(pTHX_ SV *sv, SV *ssv)
{
- SV* sv;
- SHAREDSvLOCK(ssv);
- sv = SHAREDSvGET(ssv);
- if (SvREFCNT(sv) == 1) {
- switch (SvTYPE(sv)) {
- case SVt_RV:
- if (SvROK(sv))
- Perl_sharedsv_thrcnt_dec(aTHX_ INT2PTR(shared_sv *, SvIV(SvRV(sv))));
- break;
- case SVt_PVAV: {
- SV **src_ary = AvARRAY((AV *)sv);
- SSize_t items = AvFILLp((AV *)sv) + 1;
-
- while (items-- > 0) {
- if(SvTYPE(*src_ary))
- Perl_sharedsv_thrcnt_dec(aTHX_ INT2PTR(shared_sv *, SvIV(*src_ary)));
- src_ary++;
+ dTHXc;
+ bool allowed = TRUE;
+
+ assert(PL_sharedsv_lock.owner == aTHX);
+ if (SvROK(sv)) {
+ SV *obj = SvRV(sv);
+ SV *sobj = Perl_sharedsv_find(aTHX_ obj);
+ if (sobj) {
+ SHARED_CONTEXT;
+ (void)SvUPGRADE(ssv, SVt_RV);
+ sv_setsv_nomg(ssv, &PL_sv_undef);
+
+ SvRV_set(ssv, SvREFCNT_inc(sobj));
+ SvROK_on(ssv);
+ if (SvOBJECT(sobj)) {
+ /* Remove any old blessing */
+ SvREFCNT_dec(SvSTASH(sobj));
+ SvOBJECT_off(sobj);
}
- break;
+ if (SvOBJECT(obj)) {
+ SV* fake_stash = newSVpv(HvNAME_get(SvSTASH(obj)),0);
+ SvOBJECT_on(sobj);
+ SvSTASH_set(sobj, (HV*)fake_stash);
+ }
+ CALLER_CONTEXT;
+ } else {
+ allowed = FALSE;
}
- case SVt_PVHV: {
- HE *entry;
- (void)hv_iterinit((HV *)sv);
- while ((entry = hv_iternext((HV *)sv)))
- Perl_sharedsv_thrcnt_dec(
- aTHX_ INT2PTR(shared_sv *, SvIV(hv_iterval((HV *)sv, entry)))
- );
- break;
+ } else {
+ SvTEMP_off(sv);
+ SHARED_CONTEXT;
+ sv_setsv_nomg(ssv, sv);
+ if (SvOBJECT(ssv)) {
+ /* Remove any old blessing */
+ SvREFCNT_dec(SvSTASH(ssv));
+ SvOBJECT_off(ssv);
}
+ if (SvOBJECT(sv)) {
+ SV* fake_stash = newSVpv(HvNAME_get(SvSTASH(sv)),0);
+ SvOBJECT_on(ssv);
+ SvSTASH_set(ssv, (HV*)fake_stash);
}
+ CALLER_CONTEXT;
+ }
+ if (!allowed) {
+ Perl_croak(aTHX_ "Invalid value for shared scalar");
}
- Perl_sv_free(PL_sharedsv_space,SHAREDSvGET(ssv));
- SHAREDSvUNLOCK(ssv);
}
+/* Set magic for PERL_MAGIC_shared_scalar(n) */
+
+int
+sharedsv_scalar_mg_set(pTHX_ SV *sv, MAGIC *mg)
+{
+ SV *ssv = (SV*)(mg->mg_ptr);
+ assert(ssv);
+ ENTER_LOCK;
+ if (SvTYPE(ssv) < SvTYPE(sv)) {
+ dTHXc;
+ SHARED_CONTEXT;
+ sv_upgrade(ssv, SvTYPE(sv));
+ CALLER_CONTEXT;
+ }
+ sharedsv_scalar_store(aTHX_ sv, ssv);
+ LEAVE_LOCK;
+ return (0);
+}
-MGVTBL svtable;
+/* Free magic for PERL_MAGIC_shared_scalar(n) */
-#define shared_sv_attach_sv(sv,shared) Perl_shared_sv_attach_sv(aTHX_ sv,shared)
+int
+sharedsv_scalar_mg_free(pTHX_ SV *sv, MAGIC *mg)
+{
+ S_sharedsv_dec(aTHX_ (SV*)mg->mg_ptr);
+ return (0);
+}
-SV* Perl_shared_sv_attach_sv (pTHX_ SV* sv, shared_sv* shared) {
- HV* shared_hv = get_hv("threads::shared::shared", FALSE);
- SV* id = newSViv(PTR2IV(shared));
- STRLEN length = sv_len(id);
- SV* tiedobject;
- SV** tiedobject_ = hv_fetch(shared_hv, SvPV(id,length), length, 0);
- if(tiedobject_) {
- tiedobject = (*tiedobject_);
- if(sv) {
- SvROK_on(sv);
- SvRV(sv) = SvRV(tiedobject);
- } else {
- sv = newRV(SvRV(tiedobject));
- }
- } else {
- switch(SvTYPE(SHAREDSvGET(shared))) {
- case SVt_PVAV: {
- SV* weakref;
- SV* obj_ref = newSViv(0);
- SV* obj = newSVrv(obj_ref,"threads::shared::av");
- AV* hv = newAV();
- sv_setiv(obj,PTR2IV(shared));
- weakref = newRV((SV*)hv);
- sv = newRV_noinc((SV*)hv);
- sv_rvweaken(weakref);
- sv_magic((SV*) hv, obj_ref, PERL_MAGIC_tied, Nullch, 0);
- hv_store(shared_hv, SvPV(id,length), length, weakref, 0);
- Perl_sharedsv_thrcnt_inc(aTHX_ shared);
- }
- break;
- case SVt_PVHV: {
- SV* weakref;
- SV* obj_ref = newSViv(0);
- SV* obj = newSVrv(obj_ref,"threads::shared::hv");
- HV* hv = newHV();
- sv_setiv(obj,PTR2IV(shared));
- weakref = newRV((SV*)hv);
- sv = newRV_noinc((SV*)hv);
- sv_rvweaken(weakref);
- sv_magic((SV*) hv, obj_ref, PERL_MAGIC_tied, Nullch, 0);
- hv_store(shared_hv, SvPV(id,length), length, weakref, 0);
- Perl_sharedsv_thrcnt_inc(aTHX_ shared);
- }
- break;
- default: {
- MAGIC* shared_magic;
- SV* value = newSVsv(SHAREDSvGET(shared));
- SV* obj = newSViv(PTR2IV(shared));
- sv_magic(value, 0, PERL_MAGIC_ext, "threads::shared", 16);
- shared_magic = mg_find(value, PERL_MAGIC_ext);
- shared_magic->mg_virtual = &svtable;
- shared_magic->mg_obj = newSViv(PTR2IV(shared));
- shared_magic->mg_flags |= MGf_REFCOUNTED;
- shared_magic->mg_private = 0;
- SvMAGICAL_on(value);
- sv = newRV_noinc(value);
- value = newRV(value);
- sv_rvweaken(value);
- hv_store(shared_hv, SvPV(id,length),length, value, 0);
- Perl_sharedsv_thrcnt_inc(aTHX_ shared);
- }
-
- }
+/*
+ * Called during cloning of PERL_MAGIC_shared_scalar(n) magic in new thread
+ */
+int
+sharedsv_scalar_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
+{
+ SvREFCNT_inc_void(mg->mg_ptr);
+ return (0);
+}
+
+#ifdef MGf_LOCAL
+/*
+ * Called during local $shared
+ */
+int
+sharedsv_scalar_mg_local(pTHX_ SV* nsv, MAGIC *mg)
+{
+ MAGIC *nmg;
+ SV *ssv = (SV *) mg->mg_ptr;
+ if (ssv) {
+ ENTER_LOCK;
+ SvREFCNT_inc_void(ssv);
+ LEAVE_LOCK;
}
- return sv;
+ nmg = sv_magicext(nsv, mg->mg_obj, mg->mg_type, mg->mg_virtual,
+ mg->mg_ptr, mg->mg_len);
+ nmg->mg_flags = mg->mg_flags;
+ nmg->mg_private = mg->mg_private;
+
+ return (0);
}
+#endif
+
+MGVTBL sharedsv_scalar_vtbl = {
+ sharedsv_scalar_mg_get, /* get */
+ sharedsv_scalar_mg_set, /* set */
+ 0, /* len */
+ 0, /* clear */
+ sharedsv_scalar_mg_free, /* free */
+ 0, /* copy */
+ sharedsv_scalar_mg_dup, /* dup */
+#ifdef MGf_LOCAL
+ sharedsv_scalar_mg_local, /* local */
+#endif
+};
+/* ------------ PERL_MAGIC_tiedelem(p) functions -------------- */
-int shared_sv_fetch_mg (pTHX_ SV* sv, MAGIC *mg) {
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(mg->mg_obj));
- SHAREDSvLOCK(shared);
- if(mg->mg_private != shared->index) {
- if(SvROK(SHAREDSvGET(shared))) {
- shared_sv* target = INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(shared))));
- shared_sv_attach_sv(sv, target);
+/* Get magic for PERL_MAGIC_tiedelem(p) */
+
+int
+sharedsv_elem_mg_FETCH(pTHX_ SV *sv, MAGIC *mg)
+{
+ dTHXc;
+ SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj);
+ SV** svp;
+
+ ENTER_LOCK;
+ if (SvTYPE(saggregate) == SVt_PVAV) {
+ assert ( mg->mg_ptr == 0 );
+ SHARED_CONTEXT;
+ svp = av_fetch((AV*) saggregate, 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*) saggregate, key, len, 0);
+ }
+ CALLER_CONTEXT;
+ if (svp) {
+ /* Exists in the array */
+ if (SvROK(*svp)) {
+ S_get_RV(aTHX_ sv, *svp);
} else {
- sv_setsv(sv, SHAREDSvGET(shared));
+ /* XXX Can this branch ever happen? DAPM */
+ /* XXX assert("no such branch"); */
+ Perl_sharedsv_associate(aTHX_ sv, *svp);
+ sv_setsv(sv, *svp);
}
- mg->mg_private = shared->index;
+ } else {
+ /* Not in the array */
+ sv_setsv(sv, &PL_sv_undef);
}
- SHAREDSvUNLOCK(shared);
-
- return 0;
+ LEAVE_LOCK;
+ return (0);
}
-int shared_sv_store_mg (pTHX_ SV* sv, MAGIC *mg) {
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(mg->mg_obj));
- SHAREDSvLOCK(shared);
- if(SvROK(SHAREDSvGET(shared)))
- Perl_sharedsv_thrcnt_dec(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(shared)))));
- if(SvROK(sv)) {
- shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(sv));
- if(!target) {
- sv_setsv(sv,SHAREDSvGET(shared));
- SHAREDSvUNLOCK(shared);
- Perl_croak(aTHX_ "You cannot assign a non shared reference to a shared scalar");
- }
- SHAREDSvEDIT(shared);
- Perl_sv_free(PL_sharedsv_space,SHAREDSvGET(shared));
- SHAREDSvGET(shared) = newRV_noinc(newSViv(PTR2IV(target)));
+/* Set magic for PERL_MAGIC_tiedelem(p) */
+
+int
+sharedsv_elem_mg_STORE(pTHX_ SV *sv, MAGIC *mg)
+{
+ dTHXc;
+ SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj);
+ 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(saggregate);
+ if (SvTYPE(saggregate) == SVt_PVAV) {
+ assert ( mg->mg_ptr == 0 );
+ SHARED_CONTEXT;
+ svp = av_fetch((AV*) saggregate, mg->mg_len, 1);
} else {
- SHAREDSvEDIT(shared);
- sv_setsv(SHAREDSvGET(shared), sv);
+ 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*) saggregate, key, len, 1);
}
- shared->index++;
- mg->mg_private = shared->index;
- SHAREDSvRELEASE(shared);
- if(SvROK(SHAREDSvGET(shared)))
- Perl_sharedsv_thrcnt_inc(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(shared)))));
- SHAREDSvUNLOCK(shared);
- return 0;
+ CALLER_CONTEXT;
+ Perl_sharedsv_associate(aTHX_ sv, *svp);
+ sharedsv_scalar_store(aTHX_ sv, *svp);
+ LEAVE_LOCK;
+ return (0);
}
-int
-shared_sv_destroy_mg (pTHX_ SV* sv, MAGIC *mg)
+/* Clear magic for PERL_MAGIC_tiedelem(p) */
+
+int
+sharedsv_elem_mg_DELETE(pTHX_ SV *sv, MAGIC *mg)
{
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(mg->mg_obj));
- if (shared) {
- HV* shared_hv = get_hv("threads::shared::shared", FALSE);
- SV* id = newSViv(PTR2IV(shared));
- STRLEN length = sv_len(id);
- hv_delete(shared_hv, SvPV(id,length), length,0);
- Perl_sharedsv_thrcnt_dec(aTHX_ shared);
+ dTHXc;
+ MAGIC *shmg;
+ SV *saggregate = S_sharedsv_from_obj(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(saggregate) == SVt_PVAV) {
+ SHARED_CONTEXT;
+ av_delete((AV*) saggregate, 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*) saggregate, key, len, G_DISCARD);
}
- return 0;
+ CALLER_CONTEXT;
+ LEAVE_LOCK;
+ return (0);
}
-MGVTBL svtable = {MEMBER_TO_FPTR(shared_sv_fetch_mg),
- MEMBER_TO_FPTR(shared_sv_store_mg),
- 0,
- 0,
- MEMBER_TO_FPTR(shared_sv_destroy_mg)
+/* Called during cloning of PERL_MAGIC_tiedelem(p) magic in new
+ * thread */
+
+int
+sharedsv_elem_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
+{
+ SvREFCNT_inc_void(S_sharedsv_from_obj(aTHX_ mg->mg_obj));
+ assert(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 */
+ 0, /* free */
+ 0, /* copy */
+ sharedsv_elem_mg_dup, /* dup */
+#ifdef MGf_LOCAL
+ 0, /* local */
+#endif
};
-MODULE = threads::shared PACKAGE = threads::shared
+/* ------------ PERL_MAGIC_tied(P) functions -------------- */
+/* Len magic for PERL_MAGIC_tied(P) */
-PROTOTYPES: ENABLE
+U32
+sharedsv_array_mg_FETCHSIZE(pTHX_ SV *sv, MAGIC *mg)
+{
+ dTHXc;
+ SV *ssv = (SV *) mg->mg_ptr;
+ U32 val;
+ SHARED_EDIT;
+ if (SvTYPE(ssv) == SVt_PVAV) {
+ val = av_len((AV*) ssv);
+ } else {
+ /* Not actually defined by tie API but ... */
+ val = HvKEYS((HV*) ssv);
+ }
+ SHARED_RELEASE;
+ return (val);
+}
+/* Clear magic for PERL_MAGIC_tied(P) */
-SV*
-ptr(ref)
- SV* ref
- CODE:
- RETVAL = newSViv(SvIV(SvRV(ref)));
- OUTPUT:
- RETVAL
-
-
-SV*
-_thrcnt(ref)
- SV* ref
- CODE:
- shared_sv* shared;
- if(SvROK(ref))
- ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX, ref);
- if(!shared)
- croak("thrcnt can only be used on shared values");
- SHAREDSvLOCK(shared);
- RETVAL = newSViv(SvREFCNT(SHAREDSvGET(shared)));
- SHAREDSvUNLOCK(shared);
- OUTPUT:
- RETVAL
+int
+sharedsv_array_mg_CLEAR(pTHX_ SV *sv, MAGIC *mg)
+{
+ dTHXc;
+ SV *ssv = (SV *) mg->mg_ptr;
+ SHARED_EDIT;
+ if (SvTYPE(ssv) == SVt_PVAV) {
+ av_clear((AV*) ssv);
+ } else {
+ hv_clear((HV*) ssv);
+ }
+ SHARED_RELEASE;
+ return (0);
+}
+/* Free magic for PERL_MAGIC_tied(P) */
-void
-thrcnt_inc(ref,perl)
- SV* ref
- SV* perl
- CODE:
- shared_sv* shared;
- PerlInterpreter* origperl = INT2PTR(PerlInterpreter*, SvIV(perl));
- PerlInterpreter* oldperl = PERL_GET_CONTEXT;
- if(SvROK(ref))
- ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX, ref);
- if(!shared)
- croak("thrcnt can only be used on shared values");
- PERL_SET_CONTEXT(origperl);
- Perl_sharedsv_thrcnt_inc(aTHX_ shared);
- PERL_SET_CONTEXT(oldperl);
+int
+sharedsv_array_mg_free(pTHX_ SV *sv, MAGIC *mg)
+{
+ S_sharedsv_dec(aTHX_ (SV*)mg->mg_ptr);
+ return (0);
+}
+
+/*
+ * Copy magic for PERL_MAGIC_tied(P)
+ * 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)
+{
+ MAGIC *nmg = sv_magicext(nsv,mg->mg_obj,
+ toLOWER(mg->mg_type),&sharedsv_elem_vtbl,
+ name, namlen);
+ nmg->mg_flags |= MGf_DUP;
+ return (1);
+}
+
+/* Called during cloning of PERL_MAGIC_tied(P) magic in new thread */
+
+int
+sharedsv_array_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
+{
+ SvREFCNT_inc_void((SV*)mg->mg_ptr);
+ assert(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 */
+#ifdef MGf_LOCAL
+ 0, /* local */
+#endif
+};
+
+
+/* Recursively unlocks a shared sv. */
void
-_thrcnt_dec(ref)
- SV* ref
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(ref));
- if(!shared)
- croak("thrcnt can only be used on shared values");
- Perl_sharedsv_thrcnt_dec(aTHX_ shared);
+Perl_sharedsv_unlock(pTHX_ SV *ssv)
+{
+ user_lock *ul = S_get_userlock(aTHX_ ssv, 0);
+ assert(ul);
+ recursive_lock_release(aTHX_ &ul->lock);
+}
+
+/* Recursive locks on a sharedsv.
+ * Locks are dynamically scoped at the level of the first lock.
+ */
void
-unlock_enabled(ref)
- SV* ref
- PROTOTYPE: \[$@%]
- CODE:
- shared_sv* shared;
- if(SvROK(ref))
- ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX, ref);
- if(!shared)
- croak("unlock can only be used on shared values");
- SHAREDSvUNLOCK(shared);
+Perl_sharedsv_lock(pTHX_ SV *ssv)
+{
+ user_lock *ul;
+ if (! ssv)
+ return;
+ ul = S_get_userlock(aTHX_ ssv, 1);
+ recursive_lock_acquire(aTHX_ &ul->lock, __FILE__, __LINE__);
+}
+
+/* Handles calls from lock() builtin via PL_lockhook */
void
-lock_enabled(ref)
- SV* ref
- CODE:
- shared_sv* shared;
- if(SvROK(ref))
- ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX, ref);
- if(!shared)
- croak("lock can only be used on shared values");
- SHAREDSvLOCK(shared);
+Perl_sharedsv_locksv(pTHX_ SV *sv)
+{
+ SV *ssv;
+
+ if (SvROK(sv))
+ sv = SvRV(sv);
+ ssv = Perl_sharedsv_find(aTHX_ sv);
+ if (!ssv)
+ croak("lock can only be used on shared values");
+ Perl_sharedsv_lock(aTHX_ ssv);
+}
+/* Saves a space for keeping SVs wider than an interpreter. */
+
void
-cond_wait_enabled(ref)
- SV* ref
- PROTOTYPE: \[$@%]
- CODE:
- shared_sv* shared;
- int locks;
- 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->owner != PERL_GET_CONTEXT)
- croak("You need a lock before you can cond_wait");
- MUTEX_LOCK(&shared->mutex);
- shared->owner = NULL;
- locks = shared->locks = 0;
- COND_WAIT(&shared->user_cond, &shared->mutex);
- shared->owner = PERL_GET_CONTEXT;
- shared->locks = locks;
- MUTEX_UNLOCK(&shared->mutex);
-
-void cond_signal_enabled(ref)
- SV* ref
- PROTOTYPE: \[$@%]
- CODE:
- shared_sv* shared;
- if(SvROK(ref))
- ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX_ ref);
- if(!shared)
- croak("cond_signal can only be used on shared values");
- COND_SIGNAL(&shared->user_cond);
-
-
-void cond_broadcast_enabled(ref)
- SV* ref
- PROTOTYPE: \[$@%]
- CODE:
- shared_sv* shared;
- if(SvROK(ref))
- ref = SvRV(ref);
- shared = Perl_sharedsv_find(aTHX_ ref);
- if(!shared)
- croak("cond_broadcast can only be used on shared values");
- COND_BROADCAST(&shared->user_cond);
-
-MODULE = threads::shared PACKAGE = threads::shared::sv
-
-SV*
-new(class, value)
- SV* class
- SV* value
- CODE:
- shared_sv* shared = Perl_sharedsv_new(aTHX);
- MAGIC* shared_magic;
- SV* obj = newSViv(PTR2IV(shared));
- SHAREDSvEDIT(shared);
- SHAREDSvGET(shared) = newSVsv(value);
- SHAREDSvRELEASE(shared);
- sv_magic(value, 0, PERL_MAGIC_ext, "threads::shared", 16);
- shared_magic = mg_find(value, PERL_MAGIC_ext);
- shared_magic->mg_virtual = &svtable;
- shared_magic->mg_obj = newSViv(PTR2IV(shared));
- shared_magic->mg_flags |= MGf_REFCOUNTED;
- shared_magic->mg_private = 0;
- SvMAGICAL_on(value);
- RETVAL = obj;
- OUTPUT:
- RETVAL
+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::av
-
-SV*
-new(class, value)
- SV* class
- SV* value
- CODE:
- shared_sv* shared = Perl_sharedsv_new(aTHX);
- SV* obj = newSViv(PTR2IV(shared));
- SHAREDSvEDIT(shared);
- SHAREDSvGET(shared) = (SV*) newAV();
- SHAREDSvRELEASE(shared);
- RETVAL = obj;
- OUTPUT:
- RETVAL
+MODULE = threads::shared PACKAGE = threads::shared::tie
+
+PROTOTYPES: DISABLE
+
+#ifdef USE_ITHREADS
void
-STORE(self, index, value)
- SV* self
- SV* index
- SV* value
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SV* aentry;
- SV** aentry_;
- if(SvROK(value)) {
- shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(value));
- if(!target) {
- Perl_croak(aTHX_ "You cannot assign a non shared reference to a shared array");
- }
- value = newRV_noinc(newSViv(PTR2IV(target)));
+PUSH(SV *obj, ...)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
+ int i;
+ for (i = 1; i < items; i++) {
+ SV* tmp = newSVsv(ST(i));
+ SV *stmp;
+ ENTER_LOCK;
+ stmp = S_sharedsv_new_shared(aTHX_ tmp);
+ sharedsv_scalar_store(aTHX_ tmp, stmp);
+ SHARED_CONTEXT;
+ av_push((AV*) sobj, stmp);
+ SvREFCNT_inc_void(stmp);
+ SHARED_RELEASE;
+ SvREFCNT_dec(tmp);
}
- SHAREDSvLOCK(shared);
- aentry_ = av_fetch((AV*) SHAREDSvGET(shared), SvIV(index), 0);
- if(aentry_ && SvIV((*aentry_))) {
- aentry = (*aentry_);
- slot = INT2PTR(shared_sv*, SvIV(aentry));
- if(SvROK(SHAREDSvGET(slot)))
- Perl_sharedsv_thrcnt_dec(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot)))));
- SHAREDSvEDIT(slot);
- sv_setsv(SHAREDSvGET(slot), value);
- SHAREDSvRELEASE(slot);
- } else {
- slot = Perl_sharedsv_new(aTHX);
- SHAREDSvEDIT(shared);
- SHAREDSvGET(slot) = newSVsv(value);
- aentry = newSViv(PTR2IV(slot));
- av_store((AV*) SHAREDSvGET(shared), SvIV(index), aentry);
- SHAREDSvRELEASE(shared);
- }
- if(SvROK(SHAREDSvGET(slot)))
- Perl_sharedsv_thrcnt_inc(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot)))));
-
- SHAREDSvUNLOCK(shared);
-
-SV*
-FETCH(self, index)
- SV* self
- SV* index
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SV* aentry;
- SV** aentry_;
- SV* retval;
- SHAREDSvLOCK(shared);
- aentry_ = av_fetch((AV*) SHAREDSvGET(shared), SvIV(index),0);
- if(aentry_) {
- aentry = (*aentry_);
- if(SvTYPE(aentry) == SVt_NULL) {
- retval = &PL_sv_undef;
- } else {
- slot = INT2PTR(shared_sv*, SvIV(aentry));
- if(SvROK(SHAREDSvGET(slot))) {
- shared_sv* target = INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot))));
- retval = Perl_shared_sv_attach_sv(aTHX_ NULL,target);
- } else {
- retval = newSVsv(SHAREDSvGET(slot));
- }
- }
- } else {
- retval = &PL_sv_undef;
- }
- SHAREDSvUNLOCK(shared);
- RETVAL = retval;
- OUTPUT:
- RETVAL
+
void
-PUSH(self, ...)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
+UNSHIFT(SV *obj, ...)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
int i;
- SHAREDSvLOCK(shared);
- for(i = 1; i < items; i++) {
- shared_sv* slot = Perl_sharedsv_new(aTHX);
- SV* tmp = ST(i);
- if(SvROK(tmp)) {
- shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(tmp));
- if(!target) {
- Perl_croak(aTHX_ "You cannot assign a non shared reference to a shared array");
- }
- tmp = newRV_noinc(newSViv(PTR2IV(target)));
- }
- SHAREDSvEDIT(slot);
- SHAREDSvGET(slot) = newSVsv(tmp);
- av_push((AV*) SHAREDSvGET(shared), newSViv(PTR2IV(slot)));
- SHAREDSvRELEASE(slot);
- if(SvROK(SHAREDSvGET(slot)))
- Perl_sharedsv_thrcnt_inc(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot)))));
- }
- SHAREDSvUNLOCK(shared);
+ ENTER_LOCK;
+ SHARED_CONTEXT;
+ av_unshift((AV*)sobj, items - 1);
+ CALLER_CONTEXT;
+ for (i = 1; i < items; i++) {
+ SV *tmp = newSVsv(ST(i));
+ SV *stmp = S_sharedsv_new_shared(aTHX_ tmp);
+ sharedsv_scalar_store(aTHX_ tmp, stmp);
+ SHARED_CONTEXT;
+ av_store((AV*) sobj, i - 1, stmp);
+ SvREFCNT_inc_void(stmp);
+ CALLER_CONTEXT;
+ SvREFCNT_dec(tmp);
+ }
+ LEAVE_LOCK;
+
void
-UNSHIFT(self, ...)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- int i;
- SHAREDSvLOCK(shared);
- SHAREDSvEDIT(shared);
- av_unshift((AV*)SHAREDSvGET(shared), items - 1);
- SHAREDSvRELEASE(shared);
- for(i = 1; i < items; i++) {
- shared_sv* slot = Perl_sharedsv_new(aTHX);
- SV* tmp = ST(i);
- if(SvROK(tmp)) {
- shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(tmp));
- if(!target) {
- Perl_croak(aTHX_ "You cannot assign a non shared reference to a shared array");
- }
- tmp = newRV_noinc(newSViv(PTR2IV(target)));
- }
- SHAREDSvEDIT(slot);
- SHAREDSvGET(slot) = newSVsv(tmp);
- av_store((AV*) SHAREDSvGET(shared), i - 1, newSViv(PTR2IV(slot)));
- SHAREDSvRELEASE(slot);
- if(SvROK(SHAREDSvGET(slot)))
- Perl_sharedsv_thrcnt_inc(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot)))));
- }
- SHAREDSvUNLOCK(shared);
-
-SV*
-POP(self)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SV* retval;
- SHAREDSvLOCK(shared);
- SHAREDSvEDIT(shared);
- retval = av_pop((AV*)SHAREDSvGET(shared));
- SHAREDSvRELEASE(shared);
- if(retval && SvIV(retval)) {
- slot = INT2PTR(shared_sv*, SvIV(retval));
- if(SvROK(SHAREDSvGET(slot))) {
- shared_sv* target = INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot))));
- retval = Perl_shared_sv_attach_sv(aTHX_ NULL,target);
- } else {
- retval = newSVsv(SHAREDSvGET(slot));
- }
- Perl_sharedsv_thrcnt_dec(aTHX_ slot);
- } else {
- retval = &PL_sv_undef;
- }
- SHAREDSvUNLOCK(shared);
- RETVAL = retval;
- OUTPUT:
- RETVAL
-
-
-SV*
-SHIFT(self)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SV* retval;
- SHAREDSvLOCK(shared);
- SHAREDSvEDIT(shared);
- retval = av_shift((AV*)SHAREDSvGET(shared));
- SHAREDSvRELEASE(shared);
- if(retval && SvIV(retval)) {
- slot = INT2PTR(shared_sv*, SvIV(retval));
- if(SvROK(SHAREDSvGET(slot))) {
- shared_sv* target = INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot))));
- retval = Perl_shared_sv_attach_sv(aTHX_ NULL,target);
- } else {
- retval = newSVsv(SHAREDSvGET(slot));
- }
- Perl_sharedsv_thrcnt_dec(aTHX_ slot);
- } else {
- retval = &PL_sv_undef;
- }
- SHAREDSvUNLOCK(shared);
- RETVAL = retval;
- OUTPUT:
- RETVAL
+POP(SV *obj)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
+ SV* ssv;
+ ENTER_LOCK;
+ SHARED_CONTEXT;
+ ssv = av_pop((AV*)sobj);
+ CALLER_CONTEXT;
+ ST(0) = sv_newmortal();
+ Perl_sharedsv_associate(aTHX_ ST(0), ssv);
+ SvREFCNT_dec(ssv);
+ LEAVE_LOCK;
+ /* XSRETURN(1); - implied */
+
void
-CLEAR(self)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SV** svp;
- I32 i;
- SHAREDSvLOCK(shared);
- svp = AvARRAY((AV*)SHAREDSvGET(shared));
- i = AvFILLp((AV*)SHAREDSvGET(shared));
- while ( i >= 0) {
- if(SvIV(svp[i])) {
- Perl_sharedsv_thrcnt_dec(aTHX_ INT2PTR(shared_sv*, SvIV(svp[i])));
- }
- i--;
- }
- SHAREDSvEDIT(shared);
- av_clear((AV*)SHAREDSvGET(shared));
- SHAREDSvRELEASE(shared);
- SHAREDSvUNLOCK(shared);
-
+SHIFT(SV *obj)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
+ SV* ssv;
+ ENTER_LOCK;
+ SHARED_CONTEXT;
+ ssv = av_shift((AV*)sobj);
+ CALLER_CONTEXT;
+ ST(0) = sv_newmortal();
+ Perl_sharedsv_associate(aTHX_ ST(0), ssv);
+ SvREFCNT_dec(ssv);
+ LEAVE_LOCK;
+ /* XSRETURN(1); - implied */
+
+
void
-EXTEND(self, count)
- SV* self
- SV* count
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- SHAREDSvEDIT(shared);
- av_extend((AV*)SHAREDSvGET(shared), (I32) SvIV(count));
- SHAREDSvRELEASE(shared);
-
-
-
-
-SV*
-EXISTS(self, index)
- SV* self
- SV* index
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- I32 exists;
- SHAREDSvLOCK(shared);
- exists = av_exists((AV*) SHAREDSvGET(shared), (I32) SvIV(index));
- if(exists) {
- RETVAL = &PL_sv_yes;
- } else {
- RETVAL = &PL_sv_no;
- }
- SHAREDSvUNLOCK(shared);
+EXTEND(SV *obj, IV count)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
+ SHARED_EDIT;
+ av_extend((AV*)sobj, count);
+ SHARED_RELEASE;
+
void
-STORESIZE(self,count)
- SV* self
- SV* count
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- SHAREDSvEDIT(shared);
- av_fill((AV*) SHAREDSvGET(shared), (I32) SvIV(count));
- SHAREDSvRELEASE(shared);
-
-SV*
-FETCHSIZE(self)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- SHAREDSvLOCK(shared);
- RETVAL = newSViv(av_len((AV*) SHAREDSvGET(shared)) + 1);
- SHAREDSvUNLOCK(shared);
- OUTPUT:
- RETVAL
-
-SV*
-DELETE(self,index)
- SV* self
- SV* index
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SHAREDSvLOCK(shared);
- if(av_exists((AV*) SHAREDSvGET(shared), (I32) SvIV(index))) {
- SV* tmp;
- SHAREDSvEDIT(shared);
- tmp = av_delete((AV*)SHAREDSvGET(shared), (I32) SvIV(index),0);
- SHAREDSvRELEASE(shared);
- if(SvIV(tmp)) {
- slot = INT2PTR(shared_sv*, SvIV(tmp));
- if(SvROK(SHAREDSvGET(slot))) {
- shared_sv* target = INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot))));
- RETVAL = Perl_shared_sv_attach_sv(aTHX_ NULL,target);
- } else {
- RETVAL = newSVsv(SHAREDSvGET(slot));
- }
- Perl_sharedsv_thrcnt_dec(aTHX_ slot);
- } else {
- RETVAL = &PL_sv_undef;
- }
- } else {
- RETVAL = &PL_sv_undef;
- }
- SHAREDSvUNLOCK(shared);
- OUTPUT:
- RETVAL
-
-AV*
-SPLICE(self, offset, length, ...)
- SV* self
- SV* offset
- SV* length
- CODE:
- croak("Splice is not implmented for shared arrays");
-
-MODULE = threads::shared PACKAGE = threads::shared::hv
-
-SV*
-new(class, value)
- SV* class
- SV* value
- CODE:
- shared_sv* shared = Perl_sharedsv_new(aTHX);
- SV* obj = newSViv(PTR2IV(shared));
- SHAREDSvEDIT(shared);
- SHAREDSvGET(shared) = (SV*) newHV();
- SHAREDSvRELEASE(shared);
- RETVAL = obj;
- OUTPUT:
- RETVAL
+STORESIZE(SV *obj,IV count)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
+ SHARED_EDIT;
+ av_fill((AV*) sobj, count);
+ SHARED_RELEASE;
+
void
-STORE(self, key, value)
- SV* self
- SV* key
- SV* value
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SV* hentry;
- SV** hentry_;
- STRLEN len;
- char* ckey = SvPV(key, len);
- SHAREDSvLOCK(shared);
- if(SvROK(value)) {
- shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(value));
- if(!target) {
- Perl_croak(aTHX_ "You cannot assign a non shared reference to a shared hash");
- }
- SHAREDSvEDIT(shared);
- value = newRV_noinc(newSViv(PTR2IV(target)));
- SHAREDSvRELEASE(shared);
- }
- hentry_ = hv_fetch((HV*) SHAREDSvGET(shared), ckey, len, 0);
- if(hentry_ && SvIV((*hentry_))) {
- hentry = (*hentry_);
- slot = INT2PTR(shared_sv*, SvIV(hentry));
- if(SvROK(SHAREDSvGET(slot)))
- Perl_sharedsv_thrcnt_dec(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot)))));
- SHAREDSvEDIT(slot);
- sv_setsv(SHAREDSvGET(slot), value);
- SHAREDSvRELEASE(slot);
+EXISTS(SV *obj, SV *index)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
+ bool exists;
+ if (SvTYPE(sobj) == SVt_PVAV) {
+ SHARED_EDIT;
+ exists = av_exists((AV*) sobj, SvIV(index));
} else {
- slot = Perl_sharedsv_new(aTHX);
- SHAREDSvEDIT(shared);
- SHAREDSvGET(slot) = newSVsv(value);
- hentry = newSViv(PTR2IV(slot));
- hv_store((HV*) SHAREDSvGET(shared), ckey,len , hentry, 0);
- SHAREDSvRELEASE(shared);
+ STRLEN len;
+ char *key = SvPV(index,len);
+ SHARED_EDIT;
+ exists = hv_exists((HV*) sobj, key, len);
}
- if(SvROK(SHAREDSvGET(slot)))
- Perl_sharedsv_thrcnt_inc(aTHX_ INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot)))));
- SHAREDSvUNLOCK(shared);
-
-
-SV*
-FETCH(self, key)
- SV* self
- SV* key
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- SV* hentry;
- SV** hentry_;
- SV* retval;
- STRLEN len;
- char* ckey = SvPV(key, len);
- SHAREDSvLOCK(shared);
- hentry_ = hv_fetch((HV*) SHAREDSvGET(shared), ckey, len,0);
- if(hentry_) {
- hentry = (*hentry_);
- if(SvTYPE(hentry) == SVt_NULL) {
- retval = &PL_sv_undef;
- } else {
- slot = INT2PTR(shared_sv*, SvIV(hentry));
- if(SvROK(SHAREDSvGET(slot))) {
- shared_sv* target = INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot))));
- retval = Perl_shared_sv_attach_sv(aTHX_ NULL, target);
- } else {
- retval = newSVsv(SHAREDSvGET(slot));
- }
- }
+ SHARED_RELEASE;
+ ST(0) = (exists) ? &PL_sv_yes : &PL_sv_no;
+ /* XSRETURN(1); - implied */
+
+
+void
+FIRSTKEY(SV *obj)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
+ char* key = NULL;
+ I32 len = 0;
+ HE* entry;
+ ENTER_LOCK;
+ SHARED_CONTEXT;
+ hv_iterinit((HV*) sobj);
+ entry = hv_iternext((HV*) sobj);
+ if (entry) {
+ key = hv_iterkey(entry,&len);
+ CALLER_CONTEXT;
+ ST(0) = sv_2mortal(newSVpv(key, len));
} else {
- retval = &PL_sv_undef;
+ CALLER_CONTEXT;
+ ST(0) = &PL_sv_undef;
}
- SHAREDSvUNLOCK(shared);
- RETVAL = retval;
- OUTPUT:
- RETVAL
+ LEAVE_LOCK;
+ /* XSRETURN(1); - implied */
+
void
-CLEAR(self)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- HE* entry;
- SHAREDSvLOCK(shared);
- Perl_hv_iterinit(PL_sharedsv_space, (HV*) SHAREDSvGET(shared));
- entry = Perl_hv_iternext(PL_sharedsv_space, (HV*) SHAREDSvGET(shared));
- while(entry) {
- slot = INT2PTR(shared_sv*, SvIV(Perl_hv_iterval(PL_sharedsv_space, (HV*) SHAREDSvGET(shared), entry)));
- Perl_sharedsv_thrcnt_dec(aTHX_ slot);
- entry = Perl_hv_iternext(PL_sharedsv_space,(HV*) SHAREDSvGET(shared));
- }
- SHAREDSvEDIT(shared);
- hv_clear((HV*) SHAREDSvGET(shared));
- SHAREDSvRELEASE(shared);
- SHAREDSvUNLOCK(shared);
-
-SV*
-FIRSTKEY(self)
- SV* self
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- char* key = NULL;
- I32 len;
- HE* entry;
- SHAREDSvLOCK(shared);
- Perl_hv_iterinit(PL_sharedsv_space, (HV*) SHAREDSvGET(shared));
- entry = Perl_hv_iternext(PL_sharedsv_space, (HV*) SHAREDSvGET(shared));
- if(entry) {
- key = Perl_hv_iterkey(PL_sharedsv_space, entry,&len);
- RETVAL = newSVpv(key, len);
- } else {
- RETVAL = &PL_sv_undef;
- }
- SHAREDSvUNLOCK(shared);
- OUTPUT:
- RETVAL
-
-
-SV*
-NEXTKEY(self, oldkey)
- SV* self
- SV* oldkey
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
+NEXTKEY(SV *obj, SV *oldkey)
+ CODE:
+ dTHXc;
+ SV *sobj = S_sharedsv_from_obj(aTHX_ obj);
char* key = NULL;
- I32 len;
+ I32 len = 0;
HE* entry;
- SHAREDSvLOCK(shared);
- entry = Perl_hv_iternext(PL_sharedsv_space, (HV*) SHAREDSvGET(shared));
- if(entry) {
- key = Perl_hv_iterkey(PL_sharedsv_space, entry,&len);
- RETVAL = newSVpv(key, len);
+
+ PERL_UNUSED_VAR(oldkey);
+
+ ENTER_LOCK;
+ SHARED_CONTEXT;
+ entry = hv_iternext((HV*) sobj);
+ if (entry) {
+ key = hv_iterkey(entry,&len);
+ CALLER_CONTEXT;
+ ST(0) = sv_2mortal(newSVpv(key, len));
} else {
- RETVAL = &PL_sv_undef;
+ CALLER_CONTEXT;
+ ST(0) = &PL_sv_undef;
}
- SHAREDSvUNLOCK(shared);
- OUTPUT:
- RETVAL
+ LEAVE_LOCK;
+ /* XSRETURN(1); - implied */
-SV*
-EXISTS(self, key)
- SV* self
- SV* key
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- STRLEN len;
- char* ckey = SvPV(key, len);
- SHAREDSvLOCK(shared);
- if(hv_exists((HV*)SHAREDSvGET(shared), ckey, len)) {
- RETVAL = &PL_sv_yes;
- } else {
- RETVAL = &PL_sv_no;
- }
- SHAREDSvUNLOCK(shared);
- OUTPUT:
- RETVAL
-
-SV*
-DELETE(self, key)
- SV* self
- SV* key
- CODE:
- shared_sv* shared = INT2PTR(shared_sv*, SvIV(SvRV(self)));
- shared_sv* slot;
- STRLEN len;
- char* ckey = SvPV(key, len);
- SV* tmp;
- SHAREDSvLOCK(shared);
- SHAREDSvEDIT(shared);
- tmp = hv_delete((HV*) SHAREDSvGET(shared), ckey, len,0);
- SHAREDSvRELEASE(shared);
- if(tmp) {
- slot = INT2PTR(shared_sv*, SvIV(tmp));
- if(SvROK(SHAREDSvGET(slot))) {
- shared_sv* target = INT2PTR(shared_sv*, SvIV(SvRV(SHAREDSvGET(slot))));
- RETVAL = Perl_shared_sv_attach_sv(aTHX_ NULL, target);
- } else {
- RETVAL = newSVsv(SHAREDSvGET(slot));
- }
- Perl_sharedsv_thrcnt_dec(aTHX_ slot);
- } else {
- RETVAL = &PL_sv_undef;
- }
- SHAREDSvUNLOCK(shared);
- OUTPUT:
+MODULE = threads::shared PACKAGE = threads::shared
+
+PROTOTYPES: ENABLE
+
+void
+_id(SV *ref)
+ PROTOTYPE: \[$@%]
+ PREINIT:
+ SV *ssv;
+ CODE:
+ ref = SvRV(ref);
+ if (SvROK(ref))
+ ref = SvRV(ref);
+ ssv = Perl_sharedsv_find(aTHX_ ref);
+ if (! ssv)
+ XSRETURN_UNDEF;
+ ST(0) = sv_2mortal(newSVuv(PTR2UV(ssv)));
+ /* XSRETURN(1); - implied */
+
+
+void
+_refcnt(SV *ref)
+ PROTOTYPE: \[$@%]
+ PREINIT:
+ SV *ssv;
+ CODE:
+ ref = SvRV(ref);
+ if (SvROK(ref))
+ ref = SvRV(ref);
+ ssv = Perl_sharedsv_find(aTHX_ ref);
+ if (! ssv) {
+ if (ckWARN(WARN_THREADS)) {
+ Perl_warner(aTHX_ packWARN(WARN_THREADS),
+ "%" SVf " is not shared", ST(0));
+ }
+ XSRETURN_UNDEF;
+ }
+ ST(0) = sv_2mortal(newSViv(SvREFCNT(ssv)));
+ /* XSRETURN(1); - implied */
+
+
+void
+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);
+ ST(0) = sv_2mortal(newRV_inc(ref));
+ /* XSRETURN(1); - implied */
+
+
+void
+cond_wait(SV *ref_cond, SV *ref_lock = 0)
+ PROTOTYPE: \[$@%];\[$@%]
+ PREINIT:
+ SV *ssv;
+ perl_cond* user_condition;
+ int locks;
+ user_lock *ul;
+ CODE:
+ 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);
+ ssv = Perl_sharedsv_find(aTHX_ ref_cond);
+ if (! ssv)
+ Perl_croak(aTHX_ "cond_wait can only be used on shared values");
+ ul = S_get_userlock(aTHX_ ssv, 1);
+
+ user_condition = &ul->user_cond;
+ if (ref_lock && (ref_cond != ref_lock)) {
+ 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);
+ ssv = Perl_sharedsv_find(aTHX_ ref_lock);
+ if (! ssv)
+ Perl_croak(aTHX_ "cond_wait lock must be a shared value");
+ ul = S_get_userlock(aTHX_ ssv, 1);
+ }
+ if (ul->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(&ul->lock.mutex);
+ ul->lock.owner = NULL;
+ locks = ul->lock.locks;
+ ul->lock.locks = 0;
+
+ /* Since we are releasing the lock here, we need to tell other
+ * people that it is ok to go ahead and use it */
+ COND_SIGNAL(&ul->lock.cond);
+ COND_WAIT(user_condition, &ul->lock.mutex);
+ while (ul->lock.owner != NULL) {
+ /* OK -- must reacquire the lock */
+ COND_WAIT(&ul->lock.cond, &ul->lock.mutex);
+ }
+ ul->lock.owner = aTHX;
+ ul->lock.locks = locks;
+ MUTEX_UNLOCK(&ul->lock.mutex);
+
+
+int
+cond_timedwait(SV *ref_cond, double abs, SV *ref_lock = 0)
+ PROTOTYPE: \[$@%]$;\[$@%]
+ PREINIT:
+ SV *ssv;
+ perl_cond* user_condition;
+ int locks;
+ user_lock *ul;
+ CODE:
+ 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);
+ ssv = Perl_sharedsv_find(aTHX_ ref_cond);
+ if (! ssv)
+ Perl_croak(aTHX_ "cond_timedwait can only be used on shared values");
+ ul = S_get_userlock(aTHX_ ssv, 1);
+
+ user_condition = &ul->user_cond;
+ if (ref_lock && (ref_cond != ref_lock)) {
+ 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);
+ ssv = Perl_sharedsv_find(aTHX_ ref_lock);
+ if (! ssv)
+ Perl_croak(aTHX_ "cond_timedwait lock must be a shared value");
+ ul = S_get_userlock(aTHX_ ssv, 1);
+ }
+ if (ul->lock.owner != aTHX)
+ Perl_croak(aTHX_ "You need a lock before you can cond_wait");
+
+ MUTEX_LOCK(&ul->lock.mutex);
+ ul->lock.owner = NULL;
+ locks = ul->lock.locks;
+ ul->lock.locks = 0;
+ /* Since we are releasing the lock here, we need to tell other
+ * people that it is ok to go ahead and use it */
+ COND_SIGNAL(&ul->lock.cond);
+ RETVAL = Perl_sharedsv_cond_timedwait(user_condition, &ul->lock.mutex, abs);
+ while (ul->lock.owner != NULL) {
+ /* OK -- must reacquire the lock... */
+ COND_WAIT(&ul->lock.cond, &ul->lock.mutex);
+ }
+ ul->lock.owner = aTHX;
+ ul->lock.locks = locks;
+ MUTEX_UNLOCK(&ul->lock.mutex);
+
+ if (RETVAL == 0)
+ XSRETURN_UNDEF;
+ OUTPUT:
RETVAL
+
+void
+cond_signal(SV *ref)
+ PROTOTYPE: \[$@%]
+ PREINIT:
+ SV *ssv;
+ user_lock *ul;
+ CODE:
+ 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);
+ ssv = Perl_sharedsv_find(aTHX_ ref);
+ if (! ssv)
+ Perl_croak(aTHX_ "cond_signal can only be used on shared values");
+ ul = S_get_userlock(aTHX_ ssv, 1);
+ if (ckWARN(WARN_THREADS) && ul->lock.owner != aTHX) {
+ Perl_warner(aTHX_ packWARN(WARN_THREADS),
+ "cond_signal() called on unlocked variable");
+ }
+ COND_SIGNAL(&ul->user_cond);
+
+
+void
+cond_broadcast(SV *ref)
+ PROTOTYPE: \[$@%]
+ PREINIT:
+ SV *ssv;
+ user_lock *ul;
+ CODE:
+ 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);
+ ssv = Perl_sharedsv_find(aTHX_ ref);
+ if (! ssv)
+ Perl_croak(aTHX_ "cond_broadcast can only be used on shared values");
+ ul = S_get_userlock(aTHX_ ssv, 1);
+ if (ckWARN(WARN_THREADS) && ul->lock.owner != aTHX) {
+ Perl_warner(aTHX_ packWARN(WARN_THREADS),
+ "cond_broadcast() called on unlocked variable");
+ }
+ COND_BROADCAST(&ul->user_cond);
+
+
+void
+bless(SV* ref, ...);
+ PROTOTYPE: $;$
+ PREINIT:
+ HV* stash;
+ SV *ssv;
+ CODE:
+ if (items == 1) {
+ stash = CopSTASH(PL_curcop);
+ } else {
+ SV* classname = ST(1);
+ STRLEN len;
+ char *ptr;
+
+ if (classname &&
+ ! SvGMAGICAL(classname) &&
+ ! SvAMAGIC(classname) &&
+ SvROK(classname))
+ {
+ Perl_croak(aTHX_ "Attempt to bless into a reference");
+ }
+ ptr = SvPV(classname, 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_void(ref);
+ (void)sv_bless(ref, stash);
+ ST(0) = sv_2mortal(ref);
+ ssv = Perl_sharedsv_find(aTHX_ ref);
+ if (ssv) {
+ dTHXc;
+ ENTER_LOCK;
+ SHARED_CONTEXT;
+ {
+ SV* fake_stash = newSVpv(HvNAME_get(stash), 0);
+ (void)sv_bless(ssv, (HV*)fake_stash);
+ }
+ CALLER_CONTEXT;
+ LEAVE_LOCK;
+ }
+ /* XSRETURN(1); - implied */
+
+#endif /* USE_ITHREADS */
+
BOOT:
{
+#ifdef USE_ITHREADS
Perl_sharedsv_init(aTHX);
+#endif /* USE_ITHREADS */
}
https://perl5.git.perl.org / perl5.git / blobdiff