[p5sagit/p5-mst-13.2.git] / Thread.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

/* Magic signature for Thread's mg_private is "Th" */ 
#define Thread_MAGIC_SIGNATURE 0x5468

static U32 threadnum = 0;
static int sig_pipe[2];

static void
remove_thread(t)
Thread t;
{
    DEBUG_L(WITH_THR(PerlIO_printf(PerlIO_stderr(),
				   "%p: remove_thread %p\n", thr, t)));
    MUTEX_LOCK(&threads_mutex);
    MUTEX_DESTROY(&t->mutex);
    nthreads--;
    t->prev->next = t->next;
    t->next->prev = t->prev;
    COND_BROADCAST(&nthreads_cond);
    MUTEX_UNLOCK(&threads_mutex);
}

static void *
threadstart(arg)
void *arg;
{
#ifdef FAKE_THREADS
    Thread savethread = thr;
    LOGOP myop;
    dSP;
    I32 oldscope = scopestack_ix;
    I32 retval;
    AV *returnav;
    int i;

    DEBUG_L(PerlIO_printf(PerlIO_stderr(), "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 */
    op = (OP*)&myop;
    Zero(op, 1, LOGOP);
    myop.op_flags = OPf_STACKED;
    myop.op_next = Nullop;
    myop.op_flags |= OPf_KNOW;
    myop.op_flags |= OPf_WANT_LIST;
    op = pp_entersub(ARGS);
    DEBUG_L(if (!op)
	    PerlIO_printf(PerlIO_stderr(), "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;
    LOGOP myop;
    dSP;
    I32 oldmark = TOPMARK;
    I32 oldscope = scopestack_ix;
    I32 retval;
    AV *returnav;
    int i, ret;
    dJMPENV;

    /* Don't call *anything* requiring dTHR until after pthread_setspecific */
    /*
     * 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 pthread_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 thread, since we're
     * the only thread who can get at it anyway.
     */
    if (pthread_setspecific(thr_key, (void *) thr))
	croak("panic: pthread_setspecific");

    /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
    DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
			  thr, SvPEEK(TOPs)));

    JMPENV_PUSH(ret);
    switch (ret) {
    case 3:
        PerlIO_printf(PerlIO_stderr(), "panic: threadstart\n");
	/* fall through */
    case 1:
	STATUS_ALL_FAILURE;
	/* fall through */
    case 2:
	/* my_exit() was called */
	while (scopestack_ix > oldscope)
	    LEAVE;
	JMPENV_POP;
	av_store(returnav, 0, newSViv(statusvalue));
	goto finishoff;
    }

    /* Now duplicate most of perl_call_sv but with a few twists */
    op = (OP*)&myop;
    Zero(op, 1, LOGOP);
    myop.op_flags = OPf_STACKED;
    myop.op_next = Nullop;
    myop.op_flags |= OPf_KNOW;
    myop.op_flags |= OPf_WANT_LIST;
    op = pp_entersub(ARGS);
    if (op)
	runops();
    SPAGAIN;
    retval = sp - (stack_base + oldmark);
    sp = stack_base + oldmark + 1;
    DEBUG_L(for (i = 1; i <= retval; i++)
		PerlIO_printf(PerlIO_stderr(),
			      "%p returnav[%d] = %s\n",
			      thr, i, SvPEEK(sp[i - 1]));)
    returnav = newAV();
    av_store(returnav, 0, newSVpv("", 0));
    for (i = 1; i <= retval; i++, sp++)
	sv_setsv(*av_fetch(returnav, i, TRUE), SvREFCNT_inc(*sp));
    
  finishoff:
#if 0    
    /* removed for debug */
    SvREFCNT_dec(curstack);
#endif
    SvREFCNT_dec(cvcache);
    Safefree(markstack);
    Safefree(scopestack);
    Safefree(savestack);
    Safefree(retstack);
    Safefree(cxstack);
    Safefree(tmps_stack);

    MUTEX_LOCK(&thr->mutex);
    DEBUG_L(PerlIO_printf(PerlIO_stderr(),
			  "%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_L(PerlIO_printf(PerlIO_stderr(),
			      "%p: R_JOINABLE thread finished\n", thr));
	break;
    case THRf_R_JOINED:
	ThrSETSTATE(thr, THRf_DEAD);
	MUTEX_UNLOCK(&thr->mutex);
	remove_thread(thr);
	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
			      "%p: R_JOINED thread finished\n", thr));
	break;
    case THRf_R_DETACHED:
	ThrSETSTATE(thr, THRf_DEAD);
	MUTEX_UNLOCK(&thr->mutex);
	SvREFCNT_dec(returnav);
	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
			      "%p: DETACHED thread finished\n", thr));
	remove_thread(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 (void *) returnav;	/* Available for anyone to join with us */
				/* unless we are detached in which case */
				/* noone will see the value anyway. */
#endif    
}

static SV *
newthread(startsv, initargs, class)
SV *startsv;
AV *initargs;
char *class;
{
    dTHR;
    dSP;
    Thread savethread;
    int i;
    SV *sv;
    sigset_t fullmask, oldmask;
    
    savethread = thr;
    sv = newSVpv("", 0);
    SvGROW(sv, sizeof(struct thread) + 1);
    SvCUR_set(sv, sizeof(struct thread));
    thr = (Thread) SvPVX(sv);
    DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: newthread(%s) = %p)\n",
			  savethread, SvPEEK(startsv), thr));
    oursv = sv; 
    /* If we don't zero these foostack pointers, init_stacks won't init them */
    markstack = 0;
    scopestack = 0;
    savestack = 0;
    retstack = 0;
    init_stacks(ARGS);
    curcop = savethread->Tcurcop;	/* XXX As good a guess as any? */
    SPAGAIN;
    defstash = savethread->Tdefstash;	/* XXX maybe these should */
    curstash = savethread->Tcurstash;	/* always be set to main? */
    /* top_env? */
    /* runlevel */
    cvcache = newHV();
    thr->flags = THRf_R_JOINABLE;
    MUTEX_INIT(&thr->mutex);
    thr->tid = ++threadnum;
    /* Insert new thread into the circular linked list and bump nthreads */
    MUTEX_LOCK(&threads_mutex);
    thr->next = savethread->next;
    thr->prev = savethread;
    savethread->next = thr;
    thr->next->prev = thr;
    nthreads++;
    MUTEX_UNLOCK(&threads_mutex);

    DEBUG_L(PerlIO_printf(PerlIO_stderr(),
			  "%p: newthread, tid is %u, preparing stack\n",
			  savethread, 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;

#ifdef FAKE_THREADS
    threadstart(thr);
#else    
    /* On your marks... */
    MUTEX_LOCK(&thr->mutex);
    /* Get set...
     * Increment the global thread count.
     */
    sigfillset(&fullmask);
    if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
	croak("panic: sigprocmask");
    if (pthread_create(&self, NULL, threadstart, (void*) thr))
	return NULL;	/* XXX should clean up first */
    /* Go */
    MUTEX_UNLOCK(&thr->mutex);
    if (sigprocmask(SIG_SETMASK, &oldmask, 0))
	croak("panic: sigprocmask");
#endif
    sv = newSViv(thr->tid);
    sv_magic(sv, oursv, '~', 0, 0);
    SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
    return sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE));
}

static Signal_t
handle_thread_signal(sig)
int sig;
{
    char c = (char) sig;
    write(sig_pipe[0], &c, 1);
}

MODULE = Thread		PACKAGE = Thread

void
new(class, startsv, ...)
	char *		class
	SV *		startsv
	AV *		av = av_make(items - 2, &ST(2));
    PPCODE:
	XPUSHs(sv_2mortal(newthread(startsv, av, class)));

void
join(t)
	Thread	t
	AV *	av = NO_INIT
	int	i = NO_INIT
    PPCODE:
	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%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(t);
	    break;
	default:
	    MUTEX_UNLOCK(&t->mutex);
	    croak("can't join with thread");
	    /* NOTREACHED */
	}
	if (pthread_join(t->Tself, (void **) &av))
	    croak("pthread_join failed");

	/* Could easily speed up the following if necessary */
	for (i = 0; i <= AvFILL(av); i++)
	    XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));

void
detach(t)
	Thread	t
    CODE:
	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%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(t);
	    break;
	default:
	    MUTEX_UNLOCK(&t->mutex);
	    croak("can't detach thread");
	    /* NOTREACHED */
	}

void
equal(t1, t2)
	Thread	t1
	Thread	t2
    PPCODE:
	PUSHs((t1 == t2) ? &sv_yes : &sv_no);

void
flags(t)
	Thread	t
    PPCODE:
	PUSHs(sv_2mortal(newSViv(t->flags)));

void
self(class)
	char *	class
    PREINIT:
	SV *sv;
    PPCODE:
	sv = newSViv(thr->tid);
	sv_magic(sv, oursv, '~', 0, 0);
	SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
	PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE))));

U32
tid(t)
	Thread	t
    CODE:
    	MUTEX_LOCK(&t->mutex);
	RETVAL = t->tid;
    	MUTEX_UNLOCK(&t->mutex);
    OUTPUT:
	RETVAL

void
DESTROY(t)
	SV *	t
    PPCODE:
	PUSHs(&sv_yes);

void
yield()
    CODE:
#ifdef OLD_PTHREADS_API
	pthread_yield();
#else
#ifndef NO_SCHED_YIELD
	sched_yield();
#endif /* NO_SCHED_YIELD */
#endif /* OLD_PTHREADS_API */

void
cond_wait(sv)
	SV *	sv
	MAGIC *	mg = NO_INIT
CODE:
	if (SvROK(sv))
	    sv = SvRV(sv);

	mg = condpair_magic(sv);
	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%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_WAIT(MgCONDP(mg), MgMUTEXP(mg));
	while (MgOWNER(mg))
	    COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
	MgOWNER(mg) = thr;
	MUTEX_UNLOCK(MgMUTEXP(mg));
	
void
cond_signal(sv)
	SV *	sv
	MAGIC *	mg = NO_INIT
CODE:
	if (SvROK(sv))
	    sv = SvRV(sv);

	mg = condpair_magic(sv);
	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%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));

void
cond_broadcast(sv)
	SV *	sv
	MAGIC *	mg = NO_INIT
CODE:
	if (SvROK(sv))
	    sv = SvRV(sv);

	mg = condpair_magic(sv);
	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%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));

void
list(class)
	char *	class
    PREINIT:
	Thread	t;
	AV *	av;
	SV **	svp;
	int	n = 0;
    PPCODE:
	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(&threads_mutex);
	do {
	    n = nthreads;
	    MUTEX_UNLOCK(&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(class, TRUE)));
	
		}
	    }
	    MUTEX_LOCK(&threads_mutex);
	} while (n < nthreads);
	n = 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->Toursv);
	    SvMAGIC(sv)->mg_flags |= MGf_REFCOUNTED;
	    SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
	    t = t->next;
	    svp++;
	} while (t != thr);
	/*  */
	MUTEX_UNLOCK(&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);


MODULE = Thread		PACKAGE = Thread::Signal

void
kill_sighandler_thread()
    PPCODE:
	write(sig_pipe[0], "\0", 1);
	PUSHs(&sv_yes);

void
init_thread_signals()
    PPCODE:
	sighandlerp = handle_thread_signal;
	if (pipe(sig_pipe) == -1)
	    XSRETURN_UNDEF;
	PUSHs(&sv_yes);

SV *
await_signal()
    PREINIT:
	char c;
	ssize_t ret;
    CODE:
	do {
	    ret = read(sig_pipe[1], &c, 1);
	} while (ret == -1 && errno == EINTR);
	if (ret == -1)
	    croak("panic: await_signal");
	if (ret == 0)
	    XSRETURN_UNDEF;
	RETVAL = c ? psig_ptr[c] : &sv_no;
    OUTPUT:
	RETVAL
Commit	Line	Data
d9bb3666	1	#include "EXTERN.h"
	2	#include "perl.h"
	3	#include "XSUB.h"
	4
7d901afa	5	/* Magic signature for Thread's mg_private is "Th" */
	6	#define Thread_MAGIC_SIGNATURE 0x5468
	7
	8	static U32 threadnum = 0;
85ced67f	9	static int sig_pipe[2];
683929b4	10
7d901afa	11	static void
	12	remove_thread(t)
	13	Thread t;
	14	{
	15	DEBUG_L(WITH_THR(PerlIO_printf(PerlIO_stderr(),
	16	"%p: remove_thread %p\n", thr, t)));
	17	MUTEX_LOCK(&threads_mutex);
0a00ffdb	18	MUTEX_DESTROY(&t->mutex);
7d901afa	19	nthreads--;
	20	t->prev->next = t->next;
	21	t->next->prev = t->prev;
	22	COND_BROADCAST(&nthreads_cond);
	23	MUTEX_UNLOCK(&threads_mutex);
	24	}
	25
d9bb3666	26	static void *
	27	threadstart(arg)
	28	void *arg;
	29	{
783070da	30	#ifdef FAKE_THREADS
	31	Thread savethread = thr;
	32	LOGOP myop;
	33	dSP;
	34	I32 oldscope = scopestack_ix;
	35	I32 retval;
50112d62	36	AV *returnav;
783070da	37	int i;
783070da	38
683929b4	39	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
683929b4	40	thr, SvPEEK(TOPs)));
783070da	41	thr = (Thread) arg;
	42	savemark = TOPMARK;
	43	thr->prev = thr->prev_run = savethread;
	44	thr->next = savethread->next;
	45	thr->next_run = savethread->next_run;
	46	savethread->next = savethread->next_run = thr;
	47	thr->wait_queue = 0;
	48	thr->private = 0;
	49
	50	/* Now duplicate most of perl_call_sv but with a few twists */
	51	op = (OP*)&myop;
	52	Zero(op, 1, LOGOP);
	53	myop.op_flags = OPf_STACKED;
	54	myop.op_next = Nullop;
	55	myop.op_flags \|= OPf_KNOW;
	56	myop.op_flags \|= OPf_WANT_LIST;
	57	op = pp_entersub(ARGS);
	58	DEBUG_L(if (!op)
	59	PerlIO_printf(PerlIO_stderr(), "thread starts at Nullop\n"));
	60	/*
	61	* When this thread is next scheduled, we start in the right
	62	* place. When the thread runs off the end of the sub, perl.c
	63	* handles things, using savemark to figure out how much of the
	64	* stack is the return value for any join.
	65	*/
	66	thr = savethread; /* back to the old thread */
	67	return 0;
	68	#else
d9bb3666	69	Thread thr = (Thread) arg;
	70	LOGOP myop;
	71	dSP;
	72	I32 oldmark = TOPMARK;
	73	I32 oldscope = scopestack_ix;
	74	I32 retval;
50112d62	75	AV *returnav;
14fcddff	76	int i, ret;
783070da	77	dJMPENV;
783070da	78
783070da	79	/* Don't call anything requiring dTHR until after pthread_setspecific */
d9bb3666	80	/*
	81	* Wait until our creator releases us. If we didn't do this, then
	82	* it would be potentially possible for out thread to carry on and
	83	* do stuff before our creator fills in our "self" field. For example,
	84	* if we went and created another thread which tried to pthread_join
	85	* with us, then we'd be in a mess.
	86	*/
50112d62	87	MUTEX_LOCK(&thr->mutex);
50112d62	88	MUTEX_UNLOCK(&thr->mutex);
d9bb3666	89
d9bb3666	90	/*
	91	* It's safe to wait until now to set the thread-specific pointer
	92	* from our pthread_t structure to our struct thread, since we're
	93	* the only thread who can get at it anyway.
	94	*/
	95	if (pthread_setspecific(thr_key, (void *) thr))
	96	croak("panic: pthread_setspecific");
	97
783070da	98	/* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
683929b4	99	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
683929b4	100	thr, SvPEEK(TOPs)));
783070da	101
	102	JMPENV_PUSH(ret);
	103	switch (ret) {
	104	case 3:
	105	PerlIO_printf(PerlIO_stderr(), "panic: threadstart\n");
d9bb3666	106	/* fall through */
783070da	107	case 1:
783070da	108	STATUS_ALL_FAILURE;
d9bb3666	109	/* fall through */
783070da	110	case 2:
	111	/* my_exit() was called */
	112	while (scopestack_ix > oldscope)
	113	LEAVE;
	114	JMPENV_POP;
d9bb3666	115	av_store(returnav, 0, newSViv(statusvalue));
	116	goto finishoff;
	117	}
	118
	119	/* Now duplicate most of perl_call_sv but with a few twists */
	120	op = (OP*)&myop;
	121	Zero(op, 1, LOGOP);
	122	myop.op_flags = OPf_STACKED;
	123	myop.op_next = Nullop;
	124	myop.op_flags \|= OPf_KNOW;
783070da	125	myop.op_flags \|= OPf_WANT_LIST;
d9bb3666	126	op = pp_entersub(ARGS);
	127	if (op)
	128	runops();
734689b1	129	SPAGAIN;
	130	retval = sp - (stack_base + oldmark);
	131	sp = stack_base + oldmark + 1;
783070da	132	DEBUG_L(for (i = 1; i <= retval; i++)
	133	PerlIO_printf(PerlIO_stderr(),
	134	"%p returnav[%d] = %s\n",
	135	thr, i, SvPEEK(sp[i - 1]));)
50112d62	136	returnav = newAV();
d9bb3666	137	av_store(returnav, 0, newSVpv("", 0));
734689b1	138	for (i = 1; i <= retval; i++, sp++)
	139	sv_setsv(av_fetch(returnav, i, TRUE), SvREFCNT_inc(sp));
	140
d9bb3666	141	finishoff:
783070da	142	#if 0
	143	/* removed for debug */
	144	SvREFCNT_dec(curstack);
	145	#endif
d9bb3666	146	SvREFCNT_dec(cvcache);
	147	Safefree(markstack);
	148	Safefree(scopestack);
	149	Safefree(savestack);
	150	Safefree(retstack);
	151	Safefree(cxstack);
	152	Safefree(tmps_stack);
	153
14fcddff	154	MUTEX_LOCK(&thr->mutex);
50112d62	155	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	156	"%p: threadstart finishing: state is %u\n",
	157	thr, ThrSTATE(thr)));
14fcddff	158	switch (ThrSTATE(thr)) {
	159	case THRf_R_JOINABLE:
	160	ThrSETSTATE(thr, THRf_ZOMBIE);
	161	MUTEX_UNLOCK(&thr->mutex);
783070da	162	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
14fcddff	163	"%p: R_JOINABLE thread finished\n", thr));
	164	break;
	165	case THRf_R_JOINED:
	166	ThrSETSTATE(thr, THRf_DEAD);
	167	MUTEX_UNLOCK(&thr->mutex);
50112d62	168	remove_thread(thr);
14fcddff	169	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	170	"%p: R_JOINED thread finished\n", thr));
	171	break;
50112d62	172	case THRf_R_DETACHED:
683929b4	173	ThrSETSTATE(thr, THRf_DEAD);
14fcddff	174	MUTEX_UNLOCK(&thr->mutex);
14fcddff	175	SvREFCNT_dec(returnav);
	176	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	177	"%p: DETACHED thread finished\n", thr));
50112d62	178	remove_thread(thr); /* This might trigger main thread to finish */
14fcddff	179	break;
	180	default:
	181	MUTEX_UNLOCK(&thr->mutex);
	182	croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
	183	/* NOTREACHED */
734689b1	184	}
d9bb3666	185	return (void ) returnav; / Available for anyone to join with us */
734689b1	186	/* unless we are detached in which case */
734689b1	187	/* noone will see the value anyway. */
783070da	188	#endif
d9bb3666	189	}
d9bb3666	190
683929b4	191	static SV *
683929b4	192	newthread(startsv, initargs, class)
d9bb3666	193	SV *startsv;
d9bb3666	194	AV *initargs;
683929b4	195	char *class;
d9bb3666	196	{
	197	dTHR;
	198	dSP;
	199	Thread savethread;
	200	int i;
683929b4	201	SV *sv;
f152979c	202	sigset_t fullmask, oldmask;
d9bb3666	203
d9bb3666	204	savethread = thr;
683929b4	205	sv = newSVpv("", 0);
	206	SvGROW(sv, sizeof(struct thread) + 1);
	207	SvCUR_set(sv, sizeof(struct thread));
	208	thr = (Thread) SvPVX(sv);
50112d62	209	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: newthread(%s) = %p)\n",
7d901afa	210	savethread, SvPEEK(startsv), thr));
683929b4	211	oursv = sv;
783070da	212	/* If we don't zero these foostack pointers, init_stacks won't init them */
	213	markstack = 0;
	214	scopestack = 0;
	215	savestack = 0;
	216	retstack = 0;
d9bb3666	217	init_stacks(ARGS);
783070da	218	curcop = savethread->Tcurcop; /* XXX As good a guess as any? */
d9bb3666	219	SPAGAIN;
	220	defstash = savethread->Tdefstash; /* XXX maybe these should */
	221	curstash = savethread->Tcurstash; /* always be set to main? */
d9bb3666	222	/* top_env? */
	223	/* runlevel */
	224	cvcache = newHV();
14fcddff	225	thr->flags = THRf_R_JOINABLE;
14fcddff	226	MUTEX_INIT(&thr->mutex);
7d901afa	227	thr->tid = ++threadnum;
	228	/* Insert new thread into the circular linked list and bump nthreads */
	229	MUTEX_LOCK(&threads_mutex);
	230	thr->next = savethread->next;
	231	thr->prev = savethread;
	232	savethread->next = thr;
	233	thr->next->prev = thr;
	234	nthreads++;
	235	MUTEX_UNLOCK(&threads_mutex);
d9bb3666	236
50112d62	237	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	238	"%p: newthread, tid is %u, preparing stack\n",
	239	savethread, thr->tid));
d9bb3666	240	/* The following pushes the arg list and startsv onto the new stack */
	241	PUSHMARK(sp);
	242	/* Could easily speed up the following greatly */
734689b1	243	for (i = 0; i <= AvFILL(initargs); i++)
d9bb3666	244	XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
	245	XPUSHs(SvREFCNT_inc(startsv));
	246	PUTBACK;
	247
783070da	248	#ifdef FAKE_THREADS
	249	threadstart(thr);
	250	#else
d9bb3666	251	/* On your marks... */
14fcddff	252	MUTEX_LOCK(&thr->mutex);
d9bb3666	253	/* Get set...
50112d62	254	* Increment the global thread count.
d9bb3666	255	*/
f152979c	256	sigfillset(&fullmask);
	257	if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
	258	croak("panic: sigprocmask");
d9bb3666	259	if (pthread_create(&self, NULL, threadstart, (void*) thr))
	260	return NULL; /* XXX should clean up first */
	261	/* Go */
14fcddff	262	MUTEX_UNLOCK(&thr->mutex);
f152979c	263	if (sigprocmask(SIG_SETMASK, &oldmask, 0))
f152979c	264	croak("panic: sigprocmask");
783070da	265	#endif
7d901afa	266	sv = newSViv(thr->tid);
683929b4	267	sv_magic(sv, oursv, '~', 0, 0);
7d901afa	268	SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
7d901afa	269	return sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE));
d9bb3666	270	}
d9bb3666	271
f152979c	272	static Signal_t
	273	handle_thread_signal(sig)
	274	int sig;
	275	{
	276	char c = (char) sig;
	277	write(sig_pipe[0], &c, 1);
	278	}
	279
d9bb3666	280	MODULE = Thread PACKAGE = Thread
d9bb3666	281
683929b4	282	void
d9bb3666	283	new(class, startsv, ...)
683929b4	284	char * class
d9bb3666	285	SV * startsv
734689b1	286	AV * av = av_make(items - 2, &ST(2));
683929b4	287	PPCODE:
683929b4	288	XPUSHs(sv_2mortal(newthread(startsv, av, class)));
d9bb3666	289
d9bb3666	290	void
d9bb3666	291	join(t)
	292	Thread t
	293	AV * av = NO_INIT
	294	int i = NO_INIT
	295	PPCODE:
7d901afa	296	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
7d901afa	297	thr, t, ThrSTATE(t)););
50112d62	298	MUTEX_LOCK(&t->mutex);
50112d62	299	switch (ThrSTATE(t)) {
14fcddff	300	case THRf_R_JOINABLE:
14fcddff	301	case THRf_R_JOINED:
50112d62	302	ThrSETSTATE(t, THRf_R_JOINED);
50112d62	303	MUTEX_UNLOCK(&t->mutex);
14fcddff	304	break;
14fcddff	305	case THRf_ZOMBIE:
50112d62	306	ThrSETSTATE(t, THRf_DEAD);
	307	MUTEX_UNLOCK(&t->mutex);
	308	remove_thread(t);
14fcddff	309	break;
14fcddff	310	default:
50112d62	311	MUTEX_UNLOCK(&t->mutex);
14fcddff	312	croak("can't join with thread");
	313	/* NOTREACHED */
	314	}
d9bb3666	315	if (pthread_join(t->Tself, (void **) &av))
d9bb3666	316	croak("pthread_join failed");
7d901afa	317
d9bb3666	318	/* Could easily speed up the following if necessary */
	319	for (i = 0; i <= AvFILL(av); i++)
	320	XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
	321
	322	void
734689b1	323	detach(t)
d9bb3666	324	Thread t
d9bb3666	325	CODE:
7d901afa	326	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
7d901afa	327	thr, t, ThrSTATE(t)););
50112d62	328	MUTEX_LOCK(&t->mutex);
50112d62	329	switch (ThrSTATE(t)) {
14fcddff	330	case THRf_R_JOINABLE:
50112d62	331	ThrSETSTATE(t, THRf_R_DETACHED);
14fcddff	332	/* fall through */
50112d62	333	case THRf_R_DETACHED:
14fcddff	334	DETACH(t);
50112d62	335	MUTEX_UNLOCK(&t->mutex);
14fcddff	336	break;
14fcddff	337	case THRf_ZOMBIE:
50112d62	338	ThrSETSTATE(t, THRf_DEAD);
7d901afa	339	DETACH(t);
50112d62	340	MUTEX_UNLOCK(&t->mutex);
50112d62	341	remove_thread(t);
14fcddff	342	break;
14fcddff	343	default:
50112d62	344	MUTEX_UNLOCK(&t->mutex);
14fcddff	345	croak("can't detach thread");
14fcddff	346	/* NOTREACHED */
734689b1	347	}
d9bb3666	348
d9bb3666	349	void
7d901afa	350	equal(t1, t2)
	351	Thread t1
	352	Thread t2
	353	PPCODE:
	354	PUSHs((t1 == t2) ? &sv_yes : &sv_no);
	355
	356	void
	357	flags(t)
	358	Thread t
	359	PPCODE:
	360	PUSHs(sv_2mortal(newSViv(t->flags)));
	361
	362	void
	363	self(class)
	364	char * class
	365	PREINIT:
	366	SV *sv;
	367	PPCODE:
	368	sv = newSViv(thr->tid);
	369	sv_magic(sv, oursv, '~', 0, 0);
	370	SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
	371	PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE))));
	372
50112d62	373	U32
	374	tid(t)
	375	Thread t
	376	CODE:
	377	MUTEX_LOCK(&t->mutex);
	378	RETVAL = t->tid;
	379	MUTEX_UNLOCK(&t->mutex);
	380	OUTPUT:
	381	RETVAL
	382
	383	void
	384	DESTROY(t)
	385	SV * t
	386	PPCODE:
	387	PUSHs(&sv_yes);
	388
7d901afa	389	void
734689b1	390	yield()
d9bb3666	391	CODE:
734689b1	392	#ifdef OLD_PTHREADS_API
	393	pthread_yield();
	394	#else
	395	#ifndef NO_SCHED_YIELD
	396	sched_yield();
	397	#endif /* NO_SCHED_YIELD */
	398	#endif /* OLD_PTHREADS_API */
d9bb3666	399
d9bb3666	400	void
734689b1	401	cond_wait(sv)
	402	SV * sv
	403	MAGIC * mg = NO_INIT
	404	CODE:
2c127b02	405	if (SvROK(sv))
734689b1	406	sv = SvRV(sv);
2c127b02	407
734689b1	408	mg = condpair_magic(sv);
683929b4	409	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
734689b1	410	MUTEX_LOCK(MgMUTEXP(mg));
	411	if (MgOWNER(mg) != thr) {
	412	MUTEX_UNLOCK(MgMUTEXP(mg));
	413	croak("cond_wait for lock that we don't own\n");
	414	}
	415	MgOWNER(mg) = 0;
	416	COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
50112d62	417	while (MgOWNER(mg))
50112d62	418	COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
734689b1	419	MgOWNER(mg) = thr;
	420	MUTEX_UNLOCK(MgMUTEXP(mg));
	421
	422	void
	423	cond_signal(sv)
	424	SV * sv
	425	MAGIC * mg = NO_INIT
	426	CODE:
50112d62	427	if (SvROK(sv))
734689b1	428	sv = SvRV(sv);
50112d62	429
734689b1	430	mg = condpair_magic(sv);
683929b4	431	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
734689b1	432	MUTEX_LOCK(MgMUTEXP(mg));
	433	if (MgOWNER(mg) != thr) {
	434	MUTEX_UNLOCK(MgMUTEXP(mg));
	435	croak("cond_signal for lock that we don't own\n");
	436	}
	437	COND_SIGNAL(MgCONDP(mg));
	438	MUTEX_UNLOCK(MgMUTEXP(mg));
d9bb3666	439
734689b1	440	void
	441	cond_broadcast(sv)
	442	SV * sv
	443	MAGIC * mg = NO_INIT
	444	CODE:
783070da	445	if (SvROK(sv))
734689b1	446	sv = SvRV(sv);
783070da	447
734689b1	448	mg = condpair_magic(sv);
683929b4	449	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
683929b4	450	thr, sv));
734689b1	451	MUTEX_LOCK(MgMUTEXP(mg));
	452	if (MgOWNER(mg) != thr) {
	453	MUTEX_UNLOCK(MgMUTEXP(mg));
	454	croak("cond_broadcast for lock that we don't own\n");
	455	}
	456	COND_BROADCAST(MgCONDP(mg));
	457	MUTEX_UNLOCK(MgMUTEXP(mg));
f152979c	458
7d901afa	459	void
	460	list(class)
	461	char * class
	462	PREINIT:
	463	Thread t;
	464	AV * av;
	465	SV ** svp;
	466	int n = 0;
	467	PPCODE:
	468	av = newAV();
	469	/*
	470	* Iterate until we have enough dynamic storage for all threads.
	471	* We mustn't do any allocation while holding threads_mutex though.
	472	*/
	473	MUTEX_LOCK(&threads_mutex);
	474	do {
	475	n = nthreads;
	476	MUTEX_UNLOCK(&threads_mutex);
	477	if (AvFILL(av) < n - 1) {
	478	int i = AvFILL(av);
	479	for (i = AvFILL(av); i < n - 1; i++) {
	480	SV sv = newSViv(0); / fill in tid later */
	481	sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
	482	av_push(av, sv_bless(newRV_noinc(sv),
	483	gv_stashpv(class, TRUE)));
50112d62	484
7d901afa	485	}
	486	}
	487	MUTEX_LOCK(&threads_mutex);
	488	} while (n < nthreads);
50112d62	489	n = nthreads; /* Get the final correct value */
7d901afa	490
	491	/*
	492	* At this point, there's enough room to fill in av.
	493	* Note that we are holding threads_mutex so the list
	494	* won't change out from under us but all the remaining
	495	* processing is "fast" (no blocking, malloc etc.)
	496	*/
	497	t = thr;
	498	svp = AvARRAY(av);
	499	do {
0a00ffdb	500	SV sv = (SV)SvRV(*svp);
7d901afa	501	sv_setiv(sv, t->tid);
	502	SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->Toursv);
	503	SvMAGIC(sv)->mg_flags \|= MGf_REFCOUNTED;
	504	SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
	505	t = t->next;
0a00ffdb	506	svp++;
7d901afa	507	} while (t != thr);
50112d62	508	/* */
7d901afa	509	MUTEX_UNLOCK(&threads_mutex);
7d901afa	510	/* Truncate any unneeded slots in av */
50112d62	511	av_fill(av, n - 1);
7d901afa	512	/* Finally, push all the new objects onto the stack and drop av */
	513	EXTEND(sp, n);
	514	for (svp = AvARRAY(av); n > 0; n--, svp++)
	515	PUSHs(*svp);
	516	(void)sv_2mortal((SV*)av);
	517
	518
f152979c	519	MODULE = Thread PACKAGE = Thread::Signal
	520
	521	void
	522	kill_sighandler_thread()
	523	PPCODE:
	524	write(sig_pipe[0], "\0", 1);
	525	PUSHs(&sv_yes);
	526
	527	void
	528	init_thread_signals()
	529	PPCODE:
	530	sighandlerp = handle_thread_signal;
	531	if (pipe(sig_pipe) == -1)
	532	XSRETURN_UNDEF;
	533	PUSHs(&sv_yes);
	534
	535	SV *
	536	await_signal()
	537	PREINIT:
	538	char c;
	539	ssize_t ret;
	540	CODE:
	541	do {
	542	ret = read(sig_pipe[1], &c, 1);
	543	} while (ret == -1 && errno == EINTR);
	544	if (ret == -1)
	545	croak("panic: await_signal");
	546	if (ret == 0)
	547	XSRETURN_UNDEF;
	548	RETVAL = c ? psig_ptr[c] : &sv_no;
	549	OUTPUT:
	550	RETVAL