vendor/perl5/5.005.02

1 files changed, 641 insertions, 0 deletions

diff --git a/contrib/perl5/ext/Thread/Thread.xs b/contrib/perl5/ext/Thread/Thread.xs
new file mode 100644
index 0000000000000..48f8aa03fc78f
--- /dev/null
+++ b/contrib/perl5/ext/Thread/Thread.xs
@@ -0,0 +1,641 @@
+#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(struct perl_thread *t)
+{
+#ifdef USE_THREADS
+    DEBUG_S(WITH_THR(PerlIO_printf(PerlIO_stderr(),
+				   "%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;
+    COND_BROADCAST(&PL_nthreads_cond);
+    MUTEX_UNLOCK(&PL_threads_mutex);
+#endif
+}
+
+static THREAD_RET_TYPE
+threadstart(void *arg)
+{
+#ifdef USE_THREADS
+#ifdef FAKE_THREADS
+    Thread savethread = thr;
+    LOGOP myop;
+    dSP;
+    I32 oldscope = PL_scopestack_ix;
+    I32 retval;
+    AV *av;
+    int i;
+
+    DEBUG_S(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 */
+    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(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;
+    djSP;
+    I32 oldmark = TOPMARK;
+    I32 oldscope = PL_scopestack_ix;
+    I32 retval;
+    SV *sv;
+    AV *av = newAV();
+    int i, ret;
+    dJMPENV;
+    DEBUG_S(PerlIO_printf(PerlIO_stderr(), "new thread %p waiting to start\n",
+			  thr));
+
+    /* Don't call *anything* requiring dTHR until after SET_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.
+     */
+    SET_THR(thr);
+
+    /* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
+    DEBUG_S(PerlIO_printf(PerlIO_stderr(), "new thread %p starting at %s\n",
+			  thr, SvPEEK(TOPs)));
+
+    sv = POPs;
+    PUTBACK;
+    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(PerlIO_stderr(), "%p died: %s\n",
+			      thr, SvPV(thr->errsv, PL_na)));
+    } else {
+	DEBUG_S(STMT_START {
+	    for (i = 1; i <= retval; i++) {
+		PerlIO_printf(PerlIO_stderr(), "%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));
+    }
+
+  finishoff:
+#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);
+    SvREFCNT_dec(thr->errhv);
+
+    /*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);
+    Safefree(PL_ofs);
+
+    SvREFCNT_dec(PL_rs);
+    SvREFCNT_dec(PL_nrs);
+    SvREFCNT_dec(PL_statname);
+    Safefree(PL_screamfirst);
+    Safefree(PL_screamnext);
+    Safefree(PL_reg_start_tmp);
+    SvREFCNT_dec(PL_lastscream);
+    /*SvREFCNT_dec(PL_defoutgv);*/
+
+    MUTEX_LOCK(&thr->mutex);
+    DEBUG_S(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_S(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_S(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(av);
+	DEBUG_S(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(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 (SV *startsv, AV *initargs, char *classname)
+{
+#ifdef USE_THREADS
+    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;
+#endif
+    
+    savethread = thr;
+    thr = new_struct_thread(thr);
+    SPAGAIN;
+    DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+			  "%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;
+#ifdef THREAD_CREATE
+    err = 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 = 0;
+    if (!attr_inited) {
+	attr_inited = 1;
+#ifdef OLD_PTHREADS_API
+	err = pthread_attr_create(&attr);
+#else
+	err = pthread_attr_init(&attr);
+#endif
+#ifdef OLD_PTHREADS_API
+#ifdef VMS
+/* This is available with the old pthreads API, but only with */
+/* DecThreads (VMS and Digital Unix) */
+	if (err == 0)
+	    err = pthread_attr_setdetach_np(&attr, ATTR_JOINABLE);
+#endif
+#else
+	if (err == 0)
+	    err = pthread_attr_setdetachstate(&attr, ATTR_JOINABLE);
+#endif
+    }
+    if (err == 0)
+#ifdef OLD_PTHREADS_API
+	err = pthread_create(&thr->self, attr, threadstart, (void*) thr);
+#else
+	err = pthread_create(&thr->self, &attr, threadstart, (void*) thr);
+#endif
+    /* Go */
+    MUTEX_UNLOCK(&thr->mutex);
+#endif
+    if (err) {
+        DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+			      "%p: create of %p failed %d\n",
+			      savethread, thr, 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(classname, TRUE));
+#else
+    croak("No threads in this perl");
+    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;
+    /*
+     * 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(PerlIO_stderr(),
+	    "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(startsv, av, classname)));
+
+void
+join(t)
+	Thread	t
+	AV *	av = NO_INIT
+	int	i = NO_INIT
+    PPCODE:
+#ifdef USE_THREADS
+	DEBUG_S(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);
+
+	if (SvTRUE(*av_fetch(av, 0, FALSE))) {
+	    /* Could easily speed up the following if necessary */
+	    for (i = 1; i <= AvFILL(av); i++)
+		XPUSHs(sv_2mortal(*av_fetch(av, i, FALSE)));
+	} else {
+	    char *mess = SvPV(*av_fetch(av, 1, FALSE), PL_na);
+	    DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+				  "%p: join propagating die message: %s\n",
+				  thr, mess));
+	    croak(mess);
+	}
+#endif
+
+void
+detach(t)
+	Thread	t
+    CODE:
+#ifdef USE_THREADS
+	DEBUG_S(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 */
+	}
+#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_THREADS
+	PUSHs(sv_2mortal(newSViv(t->flags)));
+#endif
+
+void
+self(classname)
+	char *	classname
+    PREINIT:
+	SV *sv;
+    PPCODE:        
+#ifdef USE_THREADS
+	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_THREADS
+    	MUTEX_LOCK(&t->mutex);
+	RETVAL = t->tid;
+    	MUTEX_UNLOCK(&t->mutex);
+#else 
+	RETVAL = 0;
+#endif
+    OUTPUT:
+	RETVAL
+
+void
+DESTROY(t)
+	SV *	t
+    PPCODE:
+	PUSHs(&PL_sv_yes);
+
+void
+yield()
+    CODE:
+{
+#ifdef USE_THREADS
+	YIELD;
+#endif
+}
+
+void
+cond_wait(sv)
+	SV *	sv
+	MAGIC *	mg = NO_INIT
+CODE:                       
+#ifdef USE_THREADS
+	if (SvROK(sv))
+	    sv = SvRV(sv);
+
+	mg = condpair_magic(sv);
+	DEBUG_S(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));
+#endif
+
+void
+cond_signal(sv)
+	SV *	sv
+	MAGIC *	mg = NO_INIT
+CODE:
+#ifdef USE_THREADS
+	if (SvROK(sv))
+	    sv = SvRV(sv);
+
+	mg = condpair_magic(sv);
+	DEBUG_S(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));
+#endif
+
+void
+cond_broadcast(sv)
+	SV *	sv
+	MAGIC *	mg = NO_INIT
+CODE: 
+#ifdef USE_THREADS
+	if (SvROK(sv))
+	    sv = SvRV(sv);
+
+	mg = condpair_magic(sv);
+	DEBUG_S(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));
+#endif
+
+void
+list(classname)
+	char *	classname
+    PREINIT:
+	Thread	t;
+	AV *	av;
+	SV **	svp;
+	int	n = 0;
+    PPCODE:
+#ifdef USE_THREADS
+	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 ? psig_ptr[c] : &PL_sv_no);
+	DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+			      "await_signal returning %s\n", SvPEEK(ST(0))););
+
+MODULE = Thread		PACKAGE = Thread::Specific
+
+void
+data(classname = "Thread::Specific")
+	char *	classname
+    PPCODE:
+#ifdef USE_THREADS
+	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