[p5sagit/p5-mst-13.2.git] / ext / Thread / 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 THREAD_RET_TYPE
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 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.
     */
    SET_THR(thr);

    /* 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;
    }

    CATCH_SET(TRUE);

    /* 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(thr->cvcache);
    SvREFCNT_dec(thr->magicals);
    SvREFCNT_dec(thr->specific);
    SvREFCNT_dec(thr->errsv);
    SvREFCNT_dec(thr->errhv);
    Safefree(markstack);
    Safefree(scopestack);
    Safefree(savestack);
    Safefree(retstack);
    Safefree(cxstack);
    Safefree(tmps_stack);
    Safefree(ofs);

    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 THREAD_RET_CAST(returnav);	/* Available for anyone to join with */
					/* us unless we're detached, in which */
					/* case noone sees the value anyway. */
#endif    
}

static SV *
newthread(startsv, initargs, class)
SV *startsv;
AV *initargs;
char *class;
{
    dTHR;
    dSP;
    Thread savethread;
    int i;
    SV *sv;
    int err;
#ifndef THREAD_CREATE
    sigset_t fullmask, oldmask;
#endif
    
    savethread = thr;
    thr = new_struct_thread(thr);
    SPAGAIN;
    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 THREAD_CREATE
    THREAD_CREATE(thr, threadstart);
#else    
    /* On your marks... */
    MUTEX_LOCK(&thr->mutex);
    /* Get set...  */
    sigfillset(&fullmask);
    if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
	croak("panic: sigprocmask");
    err = pthread_create(&thr->self, pthread_attr_default,
			 threadstart, (void*) thr);
    /* Go */
    MUTEX_UNLOCK(&thr->mutex);
#endif
    if (err) {
	/* Thread creation failed--clean up */
	SvREFCNT_dec(thr->cvcache);
	remove_thread(thr);
	MUTEX_DESTROY(&thr->mutex);
	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;
    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 */
	}
	JOIN(t, &av);

	/* 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, thr->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:
	YIELD;

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->oursv);
	    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
ea0efc06	26	static THREAD_RET_TYPE
d9bb3666	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,
ea0efc06	84	* if we went and created another thread which tried to JOIN with us,
ea0efc06	85	* then we'd be in a mess.
d9bb3666	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	*/
ea0efc06	95	SET_THR(thr);
d9bb3666	96
783070da	97	/* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
683929b4	98	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
683929b4	99	thr, SvPEEK(TOPs)));
783070da	100
	101	JMPENV_PUSH(ret);
	102	switch (ret) {
	103	case 3:
	104	PerlIO_printf(PerlIO_stderr(), "panic: threadstart\n");
d9bb3666	105	/* fall through */
783070da	106	case 1:
783070da	107	STATUS_ALL_FAILURE;
d9bb3666	108	/* fall through */
783070da	109	case 2:
	110	/* my_exit() was called */
	111	while (scopestack_ix > oldscope)
	112	LEAVE;
	113	JMPENV_POP;
d9bb3666	114	av_store(returnav, 0, newSViv(statusvalue));
	115	goto finishoff;
	116	}
	117
199100c8	118	CATCH_SET(TRUE);
199100c8	119
d9bb3666	120	/* Now duplicate most of perl_call_sv but with a few twists */
	121	op = (OP*)&myop;
	122	Zero(op, 1, LOGOP);
	123	myop.op_flags = OPf_STACKED;
	124	myop.op_next = Nullop;
	125	myop.op_flags \|= OPf_KNOW;
783070da	126	myop.op_flags \|= OPf_WANT_LIST;
d9bb3666	127	op = pp_entersub(ARGS);
	128	if (op)
	129	runops();
734689b1	130	SPAGAIN;
	131	retval = sp - (stack_base + oldmark);
	132	sp = stack_base + oldmark + 1;
783070da	133	DEBUG_L(for (i = 1; i <= retval; i++)
	134	PerlIO_printf(PerlIO_stderr(),
	135	"%p returnav[%d] = %s\n",
	136	thr, i, SvPEEK(sp[i - 1]));)
50112d62	137	returnav = newAV();
d9bb3666	138	av_store(returnav, 0, newSVpv("", 0));
734689b1	139	for (i = 1; i <= retval; i++, sp++)
	140	sv_setsv(av_fetch(returnav, i, TRUE), SvREFCNT_inc(sp));
	141
d9bb3666	142	finishoff:
783070da	143	#if 0
	144	/* removed for debug */
	145	SvREFCNT_dec(curstack);
	146	#endif
199100c8	147	SvREFCNT_dec(thr->cvcache);
554b3eca	148	SvREFCNT_dec(thr->magicals);
554b3eca	149	SvREFCNT_dec(thr->specific);
38a03e6e	150	SvREFCNT_dec(thr->errsv);
38a03e6e	151	SvREFCNT_dec(thr->errhv);
d9bb3666	152	Safefree(markstack);
	153	Safefree(scopestack);
	154	Safefree(savestack);
	155	Safefree(retstack);
	156	Safefree(cxstack);
	157	Safefree(tmps_stack);
199100c8	158	Safefree(ofs);
d9bb3666	159
14fcddff	160	MUTEX_LOCK(&thr->mutex);
50112d62	161	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	162	"%p: threadstart finishing: state is %u\n",
	163	thr, ThrSTATE(thr)));
14fcddff	164	switch (ThrSTATE(thr)) {
	165	case THRf_R_JOINABLE:
	166	ThrSETSTATE(thr, THRf_ZOMBIE);
	167	MUTEX_UNLOCK(&thr->mutex);
783070da	168	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
14fcddff	169	"%p: R_JOINABLE thread finished\n", thr));
	170	break;
	171	case THRf_R_JOINED:
	172	ThrSETSTATE(thr, THRf_DEAD);
	173	MUTEX_UNLOCK(&thr->mutex);
50112d62	174	remove_thread(thr);
14fcddff	175	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	176	"%p: R_JOINED thread finished\n", thr));
	177	break;
50112d62	178	case THRf_R_DETACHED:
683929b4	179	ThrSETSTATE(thr, THRf_DEAD);
14fcddff	180	MUTEX_UNLOCK(&thr->mutex);
14fcddff	181	SvREFCNT_dec(returnav);
	182	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	183	"%p: DETACHED thread finished\n", thr));
50112d62	184	remove_thread(thr); /* This might trigger main thread to finish */
14fcddff	185	break;
	186	default:
	187	MUTEX_UNLOCK(&thr->mutex);
	188	croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
	189	/* NOTREACHED */
734689b1	190	}
ea0efc06	191	return THREAD_RET_CAST(returnav); /* Available for anyone to join with */
	192	/* us unless we're detached, in which */
	193	/* case noone sees the value anyway. */
783070da	194	#endif
d9bb3666	195	}
d9bb3666	196
683929b4	197	static SV *
683929b4	198	newthread(startsv, initargs, class)
d9bb3666	199	SV *startsv;
d9bb3666	200	AV *initargs;
683929b4	201	char *class;
d9bb3666	202	{
	203	dTHR;
	204	dSP;
	205	Thread savethread;
	206	int i;
683929b4	207	SV *sv;
ea0efc06	208	int err;
ea0efc06	209	#ifndef THREAD_CREATE
f152979c	210	sigset_t fullmask, oldmask;
ea0efc06	211	#endif
d9bb3666	212
d9bb3666	213	savethread = thr;
a863c7d1	214	thr = new_struct_thread(thr);
d9bb3666	215	SPAGAIN;
50112d62	216	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	217	"%p: newthread, tid is %u, preparing stack\n",
	218	savethread, thr->tid));
d9bb3666	219	/* The following pushes the arg list and startsv onto the new stack */
	220	PUSHMARK(sp);
	221	/* Could easily speed up the following greatly */
734689b1	222	for (i = 0; i <= AvFILL(initargs); i++)
d9bb3666	223	XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
	224	XPUSHs(SvREFCNT_inc(startsv));
	225	PUTBACK;
	226
ea0efc06	227	#ifdef THREAD_CREATE
ea0efc06	228	THREAD_CREATE(thr, threadstart);
783070da	229	#else
d9bb3666	230	/* On your marks... */
14fcddff	231	MUTEX_LOCK(&thr->mutex);
ea0efc06	232	/* Get set... */
f152979c	233	sigfillset(&fullmask);
	234	if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
	235	croak("panic: sigprocmask");
46930d8f	236	err = pthread_create(&thr->self, pthread_attr_default,
46930d8f	237	threadstart, (void*) thr);
d9bb3666	238	/* Go */
14fcddff	239	MUTEX_UNLOCK(&thr->mutex);
ea0efc06	240	#endif
	241	if (err) {
	242	/* Thread creation failed--clean up */
199100c8	243	SvREFCNT_dec(thr->cvcache);
ea0efc06	244	remove_thread(thr);
	245	MUTEX_DESTROY(&thr->mutex);
	246	for (i = 0; i <= AvFILL(initargs); i++)
	247	SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
	248	SvREFCNT_dec(startsv);
	249	return NULL;
	250	}
	251	#ifdef THREAD_POST_CREATE
	252	THREAD_POST_CREATE(thr);
	253	#else
f152979c	254	if (sigprocmask(SIG_SETMASK, &oldmask, 0))
f152979c	255	croak("panic: sigprocmask");
783070da	256	#endif
7d901afa	257	sv = newSViv(thr->tid);
199100c8	258	sv_magic(sv, thr->oursv, '~', 0, 0);
7d901afa	259	SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
7d901afa	260	return sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE));
d9bb3666	261	}
d9bb3666	262
f152979c	263	static Signal_t
	264	handle_thread_signal(sig)
	265	int sig;
	266	{
	267	char c = (char) sig;
	268	write(sig_pipe[0], &c, 1);
	269	}
	270
d9bb3666	271	MODULE = Thread PACKAGE = Thread
d9bb3666	272
683929b4	273	void
d9bb3666	274	new(class, startsv, ...)
683929b4	275	char * class
d9bb3666	276	SV * startsv
734689b1	277	AV * av = av_make(items - 2, &ST(2));
683929b4	278	PPCODE:
683929b4	279	XPUSHs(sv_2mortal(newthread(startsv, av, class)));
d9bb3666	280
d9bb3666	281	void
d9bb3666	282	join(t)
	283	Thread t
	284	AV * av = NO_INIT
	285	int i = NO_INIT
	286	PPCODE:
7d901afa	287	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: joining %p (state %u)\n",
7d901afa	288	thr, t, ThrSTATE(t)););
50112d62	289	MUTEX_LOCK(&t->mutex);
50112d62	290	switch (ThrSTATE(t)) {
14fcddff	291	case THRf_R_JOINABLE:
14fcddff	292	case THRf_R_JOINED:
50112d62	293	ThrSETSTATE(t, THRf_R_JOINED);
50112d62	294	MUTEX_UNLOCK(&t->mutex);
14fcddff	295	break;
14fcddff	296	case THRf_ZOMBIE:
50112d62	297	ThrSETSTATE(t, THRf_DEAD);
	298	MUTEX_UNLOCK(&t->mutex);
	299	remove_thread(t);
14fcddff	300	break;
14fcddff	301	default:
50112d62	302	MUTEX_UNLOCK(&t->mutex);
14fcddff	303	croak("can't join with thread");
	304	/* NOTREACHED */
	305	}
ea0efc06	306	JOIN(t, &av);
7d901afa	307
d9bb3666	308	/* Could easily speed up the following if necessary */
	309	for (i = 0; i <= AvFILL(av); i++)
	310	XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
	311
	312	void
734689b1	313	detach(t)
d9bb3666	314	Thread t
d9bb3666	315	CODE:
7d901afa	316	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: detaching %p (state %u)\n",
7d901afa	317	thr, t, ThrSTATE(t)););
50112d62	318	MUTEX_LOCK(&t->mutex);
50112d62	319	switch (ThrSTATE(t)) {
14fcddff	320	case THRf_R_JOINABLE:
50112d62	321	ThrSETSTATE(t, THRf_R_DETACHED);
14fcddff	322	/* fall through */
50112d62	323	case THRf_R_DETACHED:
14fcddff	324	DETACH(t);
50112d62	325	MUTEX_UNLOCK(&t->mutex);
14fcddff	326	break;
14fcddff	327	case THRf_ZOMBIE:
50112d62	328	ThrSETSTATE(t, THRf_DEAD);
7d901afa	329	DETACH(t);
50112d62	330	MUTEX_UNLOCK(&t->mutex);
50112d62	331	remove_thread(t);
14fcddff	332	break;
14fcddff	333	default:
50112d62	334	MUTEX_UNLOCK(&t->mutex);
14fcddff	335	croak("can't detach thread");
14fcddff	336	/* NOTREACHED */
734689b1	337	}
d9bb3666	338
d9bb3666	339	void
7d901afa	340	equal(t1, t2)
	341	Thread t1
	342	Thread t2
	343	PPCODE:
	344	PUSHs((t1 == t2) ? &sv_yes : &sv_no);
	345
	346	void
	347	flags(t)
	348	Thread t
	349	PPCODE:
	350	PUSHs(sv_2mortal(newSViv(t->flags)));
	351
	352	void
	353	self(class)
	354	char * class
	355	PREINIT:
	356	SV *sv;
	357	PPCODE:
	358	sv = newSViv(thr->tid);
199100c8	359	sv_magic(sv, thr->oursv, '~', 0, 0);
7d901afa	360	SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
	361	PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv), gv_stashpv(class, TRUE))));
	362
50112d62	363	U32
	364	tid(t)
	365	Thread t
	366	CODE:
	367	MUTEX_LOCK(&t->mutex);
	368	RETVAL = t->tid;
	369	MUTEX_UNLOCK(&t->mutex);
	370	OUTPUT:
	371	RETVAL
	372
	373	void
	374	DESTROY(t)
	375	SV * t
	376	PPCODE:
	377	PUSHs(&sv_yes);
	378
7d901afa	379	void
734689b1	380	yield()
d9bb3666	381	CODE:
ea0efc06	382	YIELD;
d9bb3666	383
d9bb3666	384	void
734689b1	385	cond_wait(sv)
	386	SV * sv
	387	MAGIC * mg = NO_INIT
	388	CODE:
2c127b02	389	if (SvROK(sv))
734689b1	390	sv = SvRV(sv);
2c127b02	391
734689b1	392	mg = condpair_magic(sv);
683929b4	393	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_wait %p\n", thr, sv));
734689b1	394	MUTEX_LOCK(MgMUTEXP(mg));
	395	if (MgOWNER(mg) != thr) {
	396	MUTEX_UNLOCK(MgMUTEXP(mg));
	397	croak("cond_wait for lock that we don't own\n");
	398	}
	399	MgOWNER(mg) = 0;
	400	COND_WAIT(MgCONDP(mg), MgMUTEXP(mg));
50112d62	401	while (MgOWNER(mg))
50112d62	402	COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
734689b1	403	MgOWNER(mg) = thr;
	404	MUTEX_UNLOCK(MgMUTEXP(mg));
	405
	406	void
	407	cond_signal(sv)
	408	SV * sv
	409	MAGIC * mg = NO_INIT
	410	CODE:
50112d62	411	if (SvROK(sv))
734689b1	412	sv = SvRV(sv);
50112d62	413
734689b1	414	mg = condpair_magic(sv);
683929b4	415	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_signal %p\n",thr,sv));
734689b1	416	MUTEX_LOCK(MgMUTEXP(mg));
	417	if (MgOWNER(mg) != thr) {
	418	MUTEX_UNLOCK(MgMUTEXP(mg));
	419	croak("cond_signal for lock that we don't own\n");
	420	}
	421	COND_SIGNAL(MgCONDP(mg));
	422	MUTEX_UNLOCK(MgMUTEXP(mg));
d9bb3666	423
734689b1	424	void
	425	cond_broadcast(sv)
	426	SV * sv
	427	MAGIC * mg = NO_INIT
	428	CODE:
783070da	429	if (SvROK(sv))
734689b1	430	sv = SvRV(sv);
783070da	431
734689b1	432	mg = condpair_magic(sv);
683929b4	433	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "%p: cond_broadcast %p\n",
683929b4	434	thr, sv));
734689b1	435	MUTEX_LOCK(MgMUTEXP(mg));
	436	if (MgOWNER(mg) != thr) {
	437	MUTEX_UNLOCK(MgMUTEXP(mg));
	438	croak("cond_broadcast for lock that we don't own\n");
	439	}
	440	COND_BROADCAST(MgCONDP(mg));
	441	MUTEX_UNLOCK(MgMUTEXP(mg));
f152979c	442
7d901afa	443	void
	444	list(class)
	445	char * class
	446	PREINIT:
	447	Thread t;
	448	AV * av;
	449	SV ** svp;
	450	int n = 0;
	451	PPCODE:
	452	av = newAV();
	453	/*
	454	* Iterate until we have enough dynamic storage for all threads.
	455	* We mustn't do any allocation while holding threads_mutex though.
	456	*/
	457	MUTEX_LOCK(&threads_mutex);
	458	do {
	459	n = nthreads;
	460	MUTEX_UNLOCK(&threads_mutex);
	461	if (AvFILL(av) < n - 1) {
	462	int i = AvFILL(av);
	463	for (i = AvFILL(av); i < n - 1; i++) {
	464	SV sv = newSViv(0); / fill in tid later */
	465	sv_magic(sv, 0, '~', 0, 0); /* fill in other magic later */
	466	av_push(av, sv_bless(newRV_noinc(sv),
	467	gv_stashpv(class, TRUE)));
50112d62	468
7d901afa	469	}
	470	}
	471	MUTEX_LOCK(&threads_mutex);
	472	} while (n < nthreads);
50112d62	473	n = nthreads; /* Get the final correct value */
7d901afa	474
	475	/*
	476	* At this point, there's enough room to fill in av.
	477	* Note that we are holding threads_mutex so the list
	478	* won't change out from under us but all the remaining
	479	* processing is "fast" (no blocking, malloc etc.)
	480	*/
	481	t = thr;
	482	svp = AvARRAY(av);
	483	do {
0a00ffdb	484	SV sv = (SV)SvRV(*svp);
7d901afa	485	sv_setiv(sv, t->tid);
199100c8	486	SvMAGIC(sv)->mg_obj = SvREFCNT_inc(t->oursv);
7d901afa	487	SvMAGIC(sv)->mg_flags \|= MGf_REFCOUNTED;
	488	SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
	489	t = t->next;
0a00ffdb	490	svp++;
7d901afa	491	} while (t != thr);
50112d62	492	/* */
7d901afa	493	MUTEX_UNLOCK(&threads_mutex);
7d901afa	494	/* Truncate any unneeded slots in av */
50112d62	495	av_fill(av, n - 1);
7d901afa	496	/* Finally, push all the new objects onto the stack and drop av */
	497	EXTEND(sp, n);
	498	for (svp = AvARRAY(av); n > 0; n--, svp++)
	499	PUSHs(*svp);
	500	(void)sv_2mortal((SV*)av);
	501
	502
f152979c	503	MODULE = Thread PACKAGE = Thread::Signal
	504
	505	void
	506	kill_sighandler_thread()
	507	PPCODE:
	508	write(sig_pipe[0], "\0", 1);
	509	PUSHs(&sv_yes);
	510
	511	void
	512	init_thread_signals()
	513	PPCODE:
	514	sighandlerp = handle_thread_signal;
	515	if (pipe(sig_pipe) == -1)
	516	XSRETURN_UNDEF;
	517	PUSHs(&sv_yes);
	518
	519	SV *
	520	await_signal()
	521	PREINIT:
	522	char c;
ea0efc06	523	SSize_t ret;
f152979c	524	CODE:
	525	do {
	526	ret = read(sig_pipe[1], &c, 1);
	527	} while (ret == -1 && errno == EINTR);
	528	if (ret == -1)
	529	croak("panic: await_signal");
	530	if (ret == 0)
	531	XSRETURN_UNDEF;
	532	RETVAL = c ? psig_ptr[c] : &sv_no;
	533	OUTPUT:
	534	RETVAL