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-rw-r--r--gnu/usr.bin/perl/ext/Thread/Thread.xs662
1 files changed, 662 insertions, 0 deletions
diff --git a/gnu/usr.bin/perl/ext/Thread/Thread.xs b/gnu/usr.bin/perl/ext/Thread/Thread.xs
new file mode 100644
index 00000000000..2337e8c3881
--- /dev/null
+++ b/gnu/usr.bin/perl/ext/Thread/Thread.xs
@@ -0,0 +1,662 @@
+#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;
+ 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)) {
+ STRLEN n_a;
+ 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, n_a)));
+ } 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));
+ }
+ FREETMPS;
+ LEAVE;
+
+ 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);
+ /* 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 */
+ SET_THR(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;
+
+ /* On your marks... */
+ SET_THR(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;
+#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
+#endif
+ if (err) {
+ MUTEX_UNLOCK(&thr->mutex);
+ 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;
+ sv = sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
+
+ /* Go */
+ MUTEX_UNLOCK(&thr->mutex);
+
+ return sv;
+#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 {
+ STRLEN n_a;
+ char *mess = SvPV(*av_fetch(av, 1, FALSE), n_a);
+ 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_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_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
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