#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
/* Magic signature for Thread's mg_private is "Th" */
#define Thread_MAGIC_SIGNATURE 0x5468
#ifdef __cplusplus
#ifdef I_UNISTD
#include <unistd.h>
#endif
#endif
#include <fcntl.h>
static int sig_pipe[2];
#ifndef THREAD_RET_TYPE
#define THREAD_RET_TYPE void *
#define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
#endif
static void
remove_thread(pTHX_ Thread t)
{
#ifdef USE_5005THREADS
DEBUG_S(WITH_THR(PerlIO_printf(Perl_debug_log,
"%p: remove_thread %p\n", thr, t)));
MUTEX_LOCK(&PL_threads_mutex);
MUTEX_DESTROY(&t->mutex);
PL_nthreads--;
t->prev->next = t->next;
t->next->prev = t->prev;
SvREFCNT_dec(t->oursv);
COND_BROADCAST(&PL_nthreads_cond);
MUTEX_UNLOCK(&PL_threads_mutex);
#endif
}
static THREAD_RET_TYPE
threadstart(void *arg)
{
#ifdef USE_5005THREADS
#ifdef FAKE_THREADS
Thread savethread = thr;
LOGOP myop;
dSP;
I32 oldscope = PL_scopestack_ix;
I32 retval;
AV *av;
int i;
DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p starting at %s\n",
thr, SvPEEK(TOPs)));
thr = (Thread) arg;
savemark = TOPMARK;
thr->prev = thr->prev_run = savethread;
thr->next = savethread->next;
thr->next_run = savethread->next_run;
savethread->next = savethread->next_run = thr;
thr->wait_queue = 0;
thr->private = 0;
/* Now duplicate most of perl_call_sv but with a few twists */
PL_op = (OP*)&myop;
Zero(PL_op, 1, LOGOP);
myop.op_flags = OPf_STACKED;
myop.op_next = Nullop;
myop.op_flags |= OPf_KNOW;
myop.op_flags |= OPf_WANT_LIST;
PL_op = pp_entersub(ARGS);
DEBUG_S(if (!PL_op)
PerlIO_printf(Perl_debug_log, "thread starts at Nullop\n"));
/*
* When this thread is next scheduled, we start in the right
* place. When the thread runs off the end of the sub, perl.c
* handles things, using savemark to figure out how much of the
* stack is the return value for any join.
*/
thr = savethread; /* back to the old thread */
return 0;
#else
Thread thr = (Thread) arg;
dSP;
I32 oldmark = TOPMARK;
I32 retval;
SV *sv;
AV *av;
int i;
#if defined(MULTIPLICITY)
PERL_SET_INTERP(thr->interp);
#endif
DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p waiting to start\n",
thr));
/*
* Wait until our creator releases us. If we didn't do this, then
* it would be potentially possible for out thread to carry on and
* do stuff before our creator fills in our "self" field. For example,
* if we went and created another thread which tried to JOIN with us,
* then we'd be in a mess.
*/
MUTEX_LOCK(&thr->mutex);
MUTEX_UNLOCK(&thr->mutex);
/*
* It's safe to wait until now to set the thread-specific pointer
* from our pthread_t structure to our struct perl_thread, since
* we're the only thread who can get at it anyway.
*/
PERL_SET_THX(thr);
DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p starting at %s\n",
thr, SvPEEK(TOPs)));
av = newAV();
sv = POPs;
PUTBACK;
ENTER;
SAVETMPS;
perl_call_sv(sv, G_ARRAY|G_EVAL);
SPAGAIN;
retval = SP - (PL_stack_base + oldmark);
SP = PL_stack_base + oldmark + 1;
if (SvCUR(thr->errsv)) {
MUTEX_LOCK(&thr->mutex);
thr->flags |= THRf_DID_DIE;
MUTEX_UNLOCK(&thr->mutex);
av_store(av, 0, &PL_sv_no);
av_store(av, 1, newSVsv(thr->errsv));
DEBUG_S(PerlIO_printf(Perl_debug_log, "%p died: %s\n",
thr, SvPV(thr->errsv, PL_na)));
}
else {
DEBUG_S(STMT_START {
for (i = 1; i <= retval; i++) {
PerlIO_printf(Perl_debug_log, "%p return[%d] = %s\n",
thr, i, SvPEEK(SP[i - 1]));
}
} STMT_END);
av_store(av, 0, &PL_sv_yes);
for (i = 1; i <= retval; i++, SP++)
sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*SP));
}
FREETMPS;
LEAVE;
#if 0
/* removed for debug */
SvREFCNT_dec(PL_curstack);
#endif
SvREFCNT_dec(thr->cvcache);
SvREFCNT_dec(thr->threadsv);
SvREFCNT_dec(thr->specific);
SvREFCNT_dec(thr->errsv);
/*Safefree(cxstack);*/
while (PL_curstackinfo->si_next)
PL_curstackinfo = PL_curstackinfo->si_next;
while (PL_curstackinfo) {
PERL_SI *p = PL_curstackinfo->si_prev;
SvREFCNT_dec(PL_curstackinfo->si_stack);
Safefree(PL_curstackinfo->si_cxstack);
Safefree(PL_curstackinfo);
PL_curstackinfo = p;
}
Safefree(PL_markstack);
Safefree(PL_scopestack);
Safefree(PL_savestack);
Safefree(PL_retstack);
Safefree(PL_tmps_stack);
SvREFCNT_dec(PL_ofs_sv);
SvREFCNT_dec(PL_rs);
SvREFCNT_dec(PL_statname);
SvREFCNT_dec(PL_errors);
Safefree(PL_screamfirst);
Safefree(PL_screamnext);
Safefree(PL_reg_start_tmp);
SvREFCNT_dec(PL_lastscream);
SvREFCNT_dec(PL_defoutgv);
Safefree(PL_reg_poscache);
MUTEX_LOCK(&thr->mutex);
thr->thr_done = 1;
DEBUG_S(PerlIO_printf(Perl_debug_log,
"%p: threadstart finishing: state is %u\n",
thr, ThrSTATE(thr)));
switch (ThrSTATE(thr)) {
case THRf_R_JOINABLE:
ThrSETSTATE(thr, THRf_ZOMBIE);
MUTEX_UNLOCK(&thr->mutex);
DEBUG_S(PerlIO_printf(Perl_debug_log,
"%p: R_JOINABLE thread finished\n", thr));
break;
case THRf_R_JOINED:
ThrSETSTATE(thr, THRf_DEAD);
MUTEX_UNLOCK(&thr->mutex);
remove_thread(aTHX_ thr);
DEBUG_S(PerlIO_printf(Perl_debug_log,
"%p: R_JOINED thread finished\n", thr));
break;
case THRf_R_DETACHED:
ThrSETSTATE(thr, THRf_DEAD);
MUTEX_UNLOCK(&thr->mutex);
SvREFCNT_dec(av);
DEBUG_S(PerlIO_printf(Perl_debug_log,
"%p: DETACHED thread finished\n", thr));
remove_thread(aTHX_ thr); /* This might trigger main thread to finish */
break;
default:
MUTEX_UNLOCK(&thr->mutex);
croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
/* NOTREACHED */
}
return THREAD_RET_CAST(av); /* Available for anyone to join with */
/* us unless we're detached, in which */
/* case noone sees the value anyway. */
#endif
#else
return THREAD_RET_CAST(NULL);
#endif
}
static SV *
newthread (pTHX_ SV *startsv, AV *initargs, char *classname)
{
#ifdef USE_5005THREADS
dSP;
Thread savethread;
int i;
SV *sv;
int err;
#ifndef THREAD_CREATE
static pthread_attr_t attr;
static int attr_inited = 0;
sigset_t fullmask, oldmask;
static int attr_joinable = PTHREAD_CREATE_JOINABLE;
#endif
savethread = thr;
thr = new_struct_thread(thr);
/* temporarily pretend to be the child thread in case the
* XPUSHs() below want to grow the child's stack. This is
* safe, since the other thread is not yet created, and we
* are the only ones who know about it */
PERL_SET_THX(thr);
SPAGAIN;
DEBUG_S(PerlIO_printf(Perl_debug_log,
"%p: newthread (%p), tid is %u, preparing stack\n",
savethread, thr, thr->tid));
/* The following pushes the arg list and startsv onto the *new* stack */
PUSHMARK(SP);
/* Could easily speed up the following greatly */
for (i = 0; i <= AvFILL(initargs); i++)
XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
XPUSHs(SvREFCNT_inc(startsv));
PUTBACK;
/* On your marks... */
PERL_SET_THX(savethread);
MUTEX_LOCK(&thr->mutex);
#ifdef THREAD_CREATE
err = THREAD_CREATE(thr, threadstart);
#else
/* Get set... */
sigfillset(&fullmask);
if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
croak("panic: sigprocmask");
err = 0;
if (!attr_inited) {
attr_inited = 1;
err = pthread_attr_init(&attr);
# ifdef THREAD_CREATE_NEEDS_STACK
if (err == 0)
err = pthread_attr_setstacksize(&attr, THREAD_CREATE_NEEDS_STACK);
if (err)
croak("panic: pthread_attr_setstacksize failed");
# endif
# ifdef PTHREAD_ATTR_SETDETACHSTATE
if (err == 0)
err = PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
if (err)
croak("panic: pthread_attr_setdetachstate failed");
# else
croak("panic: can't pthread_attr_setdetachstate");
# endif
}
if (err == 0)
err = PTHREAD_CREATE(&thr->self, attr, threadstart, (void*) thr);
#endif
if (err) {
MUTEX_UNLOCK(&thr->mutex);
DEBUG_S(PerlIO_printf(Perl_debug_log,
"%p: create of %p failed %d\n",
savethread, thr, err));
/* Thread creation failed--clean up */
SvREFCNT_dec(thr->cvcache);
remove_thread(aTHX_ thr);
for (i = 0; i <= AvFILL(initargs); i++)
SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
SvREFCNT_dec(startsv);
return NULL;
}
#ifdef THREAD_POST_CREATE
THREAD_POST_CREATE(thr);
#else
if (sigprocmask(SIG_SETMASK, &oldmask, 0))
croak("panic: sigprocmask");
#endif
sv = newSViv(thr->tid);
sv_magic(sv, thr->oursv, '~', 0, 0);
SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
sv = sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
/* Go */
MUTEX_UNLOCK(&thr->mutex);
return sv;
#else
# ifdef USE_ITHREADS
croak("This perl was built for \"ithreads\", which currently does not support Thread.pm.\n"
"Run \"perldoc Thread\" for more information");
# else
croak("This perl was not built with support for 5.005-style threads.\n"
"Run \"perldoc Thread\" for more information");
# endif
return &PL_sv_undef;
#endif
}
static Signal_t handle_thread_signal (int sig);
static Signal_t
handle_thread_signal(int sig)
{
unsigned char c = (unsigned char) sig;
dTHX;
/*
* We're not really allowed to call fprintf in a signal handler
* so don't be surprised if this isn't robust while debugging
* with -DL.
*/
DEBUG_S(PerlIO_printf(Perl_debug_log,
"handle_thread_signal: got signal %d\n", sig));
write(sig_pipe[1], &c, 1);
}
MODULE = Thread PACKAGE = Thread
PROTOTYPES: DISABLE
void
new(classname, startsv, ...)
char * classname
SV * startsv
AV * av = av_make(items - 2, &ST(2));
PPCODE:
XPUSHs(sv_2mortal(newthread(aTHX_ startsv, av, classname)));
void
join(t)
Thread t
AV * av = NO_INIT
int i = NO_INIT
PPCODE:
#ifdef USE_5005THREADS
if (t == thr)
croak("Attempt to join self");
DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: joining %p (state %u)\n",
thr, t, ThrSTATE(t)));
MUTEX_LOCK(&t->mutex);
switch (ThrSTATE(t)) {
case THRf_R_JOINABLE:
case THRf_R_JOINED:
ThrSETSTATE(t, THRf_R_JOINED);
MUTEX_UNLOCK(&t->mutex);
break;
case THRf_ZOMBIE:
ThrSETSTATE(t, THRf_DEAD);
MUTEX_UNLOCK(&t->mutex);
remove_thread(aTHX_ t);
break;
default:
MUTEX_UNLOCK(&t->mutex);
croak("can't join with thread");
/* NOTREACHED */
}
JOIN(t, &av);
sv_2mortal((SV*)av);
if (SvTRUE(*av_fetch(av, 0, FALSE))) {
/* Could easily speed up the following if necessary */
for (i = 1; i <= AvFILL(av); i++)
XPUSHs(*av_fetch(av, i, FALSE));
}
else {
STRLEN n_a;
char *mess = SvPV(*av_fetch(av, 1, FALSE), n_a);
DEBUG_S(PerlIO_printf(Perl_debug_log,
"%p: join propagating die message: %s\n",
thr, mess));
croak(mess);
}
#endif
void
detach(t)
Thread t
CODE:
#ifdef USE_5005THREADS
DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: detaching %p (state %u)\n",
thr, t, ThrSTATE(t)));
MUTEX_LOCK(&t->mutex);
switch (ThrSTATE(t)) {
case THRf_R_JOINABLE:
ThrSETSTATE(t, THRf_R_DETACHED);
/* fall through */
case THRf_R_DETACHED:
DETACH(t);
MUTEX_UNLOCK(&t->mutex);
break;
case THRf_ZOMBIE:
ThrSETSTATE(t, THRf_DEAD);
DETACH(t);
MUTEX_UNLOCK(&t->mutex);
remove_thread(aTHX_ t);
break;
default:
MUTEX_UNLOCK(&t->mutex);
croak("can't detach thread");
/* NOTREACHED */
}
#endif
void
equal(t1, t2)
Thread t1
Thread t2
PPCODE:
PUSHs((t1 == t2) ? &PL_sv_yes : &PL_sv_no);
void
flags(t)
Thread t
PPCODE:
#ifdef USE_5005THREADS
PUSHs(sv_2mortal(newSViv(t->flags)));
#endif
void
done(t)
Thread t
PPCODE:
#ifdef USE_5005THREADS
PUSHs(t->thr_done ? &PL_sv_yes : &PL_sv_no);
#endif
void
self(classname)
char * classname
PREINIT:
SV *sv;
PPCODE:
#ifdef USE_5005THREADS
sv = newSViv(thr->tid);
sv_magic(sv, thr->oursv, '~', 0, 0);
SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
gv_stashpv(classname, TRUE))));
#endif
U32
tid(t)
Thread t
CODE:
#ifdef USE_5005THREADS
MUTEX_LOCK(&t->mutex);
RETVAL = t->tid;
MUTEX_UNLOCK(&t->mutex);
#else
RETVAL = 0;
#endif
OUTPUT:
RETVAL
void
DESTROY(t)
SV * t
PPCODE:
PUSHs(t ? &PL_sv_yes : &PL_sv_no);
void
yield()
CODE:
{
#ifdef USE_5005THREADS
YIELD;
#endif
}
void
cond_wait(sv)
SV * sv
MAGIC * mg = NO_INIT
CODE:
#ifdef USE_5005THREADS
if (SvROK(sv))
sv = SvRV(sv);
mg = condpair_magic(sv);
DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: cond_wait %p\n", thr, sv));
MUTEX_LOCK(MgMUTEXP(mg));
if (MgOWNER(mg) != thr) {
MUTEX_UNLOCK(MgMUTEXP(mg));
croak("cond_wait for lock that we don't own\n");
}
MgOWNER(mg) = 0;
COND_SIGNAL(MgOWNERCONDP(mg));
COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
while (MgOWNER(mg))
COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
MgOWNER(mg) = thr;
MUTEX_UNLOCK(MgMUTEXP(mg));
#endif
void
cond_signal(sv)
SV * sv
MAGIC * mg = NO_INIT
CODE:
#ifdef USE_5005THREADS
if (SvROK(sv))
sv = SvRV(sv);
mg = condpair_magic(sv);
DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: cond_signal %p\n",thr,sv));
MUTEX_LOCK(MgMUTEXP(mg));
if (MgOWNER(mg) != thr) {
MUTEX_UNLOCK(MgMUTEXP(mg));
croak("cond_signal for lock that we don't own\n");
}
COND_SIGNAL(MgCONDP(mg));
MUTEX_UNLOCK(MgMUTEXP(mg));
#endif
void
cond_broadcast(sv)
SV * sv
MAGIC * mg = NO_INIT
CODE:
#ifdef USE_5005THREADS
if (SvROK(sv))
sv = SvRV(sv);
mg = condpair_magic(sv);
DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: cond_broadcast %p\n",
thr, sv));
MUTEX_LOCK(MgMUTEXP(mg));
if (MgOWNER(mg) != thr) {
MUTEX_UNLOCK(MgMUTEXP(mg));
croak("cond_broadcast for lock that we don't own\n");
}
COND_BROADCAST(MgCONDP(mg));
MUTEX_UNLOCK(MgMUTEXP(mg));
#endif
void
list(classname)
char * classname
PREINIT:
Thread t;
AV * av;
SV ** svp;
int n = 0;
PPCODE:
#ifdef USE_5005THREADS
av = newAV();
/*
* Iterate until we have enough dynamic storage for all threads.
* We mustn't do any allocation while holding threads_mutex though.
*/
MUTEX_LOCK(&PL_threads_mutex);
do {
n = PL_nthreads;
MUTEX_UNLOCK(&PL_threads_mutex);
if (AvFILL(av) < n - 1) {
int i = AvFILL(av);
for (i = AvFILL(av); i < n - 1; i++) {
SV *sv = newSViv(0); /* fill in tid later */
sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
av_push(av, sv_bless(newRV_noinc(sv),
gv_stashpv(classname, TRUE)));
}
}
MUTEX_LOCK(&PL_threads_mutex);
} while (n < PL_nthreads);
n = PL_nthreads; /* Get the final correct value */
/*
* At this point, there's enough room to fill in av.
* Note that we are holding threads_mutex so the list
* won't change out from under us but all the remaining
* processing is "fast" (no blocking, malloc etc.)
*/
t = thr;
svp = AvARRAY(av);
do {
SV *sv = (SV*)SvRV(*svp);
sv_setiv(sv, t->tid);
SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
t = t->next;
svp++;
} while (t != thr);
/* */
MUTEX_UNLOCK(&PL_threads_mutex);
/* Truncate any unneeded slots in av */
av_fill(av, n - 1);
/* Finally, push all the new objects onto the stack and drop av */
EXTEND(SP, n);
for (svp = AvARRAY(av); n > 0; n--, svp++)
PUSHs(*svp);
(void)sv_2mortal((SV*)av);
#endif
MODULE = Thread PACKAGE = Thread::Signal
void
kill_sighandler_thread()
PPCODE:
write(sig_pipe[1], "\0", 1);
PUSHs(&PL_sv_yes);
void
init_thread_signals()
PPCODE:
PL_sighandlerp = handle_thread_signal;
if (pipe(sig_pipe) == -1)
XSRETURN_UNDEF;
PUSHs(&PL_sv_yes);
void
await_signal()
PREINIT:
unsigned char c;
SSize_t ret;
CODE:
do {
ret = read(sig_pipe[0], &c, 1);
} while (ret == -1 && errno == EINTR);
if (ret == -1)
croak("panic: await_signal");
ST(0) = sv_newmortal();
if (ret)
sv_setsv(ST(0), c ? PL_psig_ptr[c] : &PL_sv_no);
DEBUG_S(PerlIO_printf(Perl_debug_log,
"await_signal returning %s\n", SvPEEK(ST(0))));
MODULE = Thread PACKAGE = Thread::Specific
void
data(classname = "Thread::Specific")
char * classname
PPCODE:
#ifdef USE_5005THREADS
if (AvFILL(thr->specific) == -1) {
GV *gv = gv_fetchpv("Thread::Specific::FIELDS", TRUE, SVt_PVHV);
av_store(thr->specific, 0, newRV((SV*)GvHV(gv)));
}
XPUSHs(sv_bless(newRV((SV*)thr->specific),gv_stashpv(classname,TRUE)));
#endif
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