X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/f0f333f45536802923a359d930d1dcfd5b4589ea..aca78d212117aacedf02dc6c4a61f8759b0bc8ec:/ext/Thread/Thread.xs diff --git a/ext/Thread/Thread.xs b/ext/Thread/Thread.xs index 45b08d1..9797303 100644 --- a/ext/Thread/Thread.xs +++ b/ext/Thread/Thread.xs @@ -1,3 +1,4 @@ +#define PERL_NO_GET_CONTEXT #include "EXTERN.h" #include "perl.h" #include "XSUB.h" @@ -12,416 +13,111 @@ #endif #include -static U32 threadnum = 0; static int sig_pipe[2]; #ifndef THREAD_RET_TYPE -typedef struct thread *Thread; #define THREAD_RET_TYPE void * #define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x) -#endif; +#endif static void -remove_thread(struct thread *t) +remove_thread(pTHX_ Thread t) { -#ifdef USE_THREADS - 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); -#endif } static THREAD_RET_TYPE threadstart(void *arg) { -#ifdef USE_THREADS -#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; - } - - /* 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 THREAD_RET_CAST(returnav); /* 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 *Class) +newthread (pTHX_ SV *startsv, AV *initargs, char *classname) { -#ifdef USE_THREADS - dTHR; - dSP; - Thread savethread; - int i; - SV *sv; - int err; -#ifndef THREAD_CREATE - sigset_t fullmask, oldmask; -#endif - - 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 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 = 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(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, oursv, '~', 0, 0); - SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE; - return sv_bless(newRV_noinc(sv), gv_stashpv(Class, TRUE)); +#ifdef USE_ITHREADS + croak("This perl was built for \"ithreads\", which currently does not support Thread.pm.\n" + "Run \"perldoc Thread\" for more information"); #else - croak("No threads in this perl"); - return &sv_undef; + croak("This perl was not built with support for 5.005-style threads.\n" + "Run \"perldoc Thread\" for more information"); #endif + return &PL_sv_undef; } -static Signal_t handle_thread_signal _((int sig)); +static Signal_t handle_thread_signal (int sig); static Signal_t handle_thread_signal(int sig) { - char c = (char) sig; - write(sig_pipe[0], &c, 1); + unsigned char c = (unsigned char) sig; + dTHX; + /* + * We're not really allowed to call fprintf in a signal handler + * so don't be surprised if this isn't robust while debugging + * with -DL. + */ + DEBUG_S(PerlIO_printf(Perl_debug_log, + "handle_thread_signal: got signal %d\n", sig)); + write(sig_pipe[1], &c, 1); } MODULE = Thread PACKAGE = Thread +PROTOTYPES: DISABLE void -new(Class, startsv, ...) - char * Class +new(classname, startsv, ...) + char * classname SV * startsv AV * av = av_make(items - 2, &ST(2)); PPCODE: - XPUSHs(sv_2mortal(newthread(startsv, av, Class))); + XPUSHs(sv_2mortal(newthread(aTHX_ startsv, av, classname))); void join(t) Thread t - AV * av = NO_INIT - int i = NO_INIT - PPCODE: -#ifdef USE_THREADS - 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))); + PREINIT: +#ifdef USE_5005THREADS + AV * av; + int i; #endif + PPCODE: void detach(t) Thread t CODE: -#ifdef USE_THREADS - 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 */ - } -#endif void equal(t1, t2) Thread t1 Thread t2 PPCODE: - PUSHs((t1 == t2) ? &sv_yes : &sv_no); + 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(Class) - char * Class +done(t) + Thread t + PPCODE: + +void +self(classname) + char * classname PREINIT: +#ifdef USE_5005THREADS SV *sv; - PPCODE: -#ifdef USE_THREADS - 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)))); #endif + PPCODE: 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 @@ -429,142 +125,31 @@ void DESTROY(t) SV * t PPCODE: - PUSHs(&sv_yes); + PUSHs(t ? &PL_sv_yes : &PL_sv_no); 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_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)); -#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_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)); -#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_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)); -#endif void -list(Class) - char * Class - PREINIT: - Thread t; - AV * av; - SV ** svp; - int n = 0; +list(classname) + char * classname 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(&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); -#endif MODULE = Thread PACKAGE = Thread::Signal @@ -572,30 +157,37 @@ MODULE = Thread PACKAGE = Thread::Signal void kill_sighandler_thread() PPCODE: - write(sig_pipe[0], "\0", 1); - PUSHs(&sv_yes); + write(sig_pipe[1], "\0", 1); + PUSHs(&PL_sv_yes); void init_thread_signals() PPCODE: - sighandlerp = handle_thread_signal; + PL_sighandlerp = handle_thread_signal; if (pipe(sig_pipe) == -1) XSRETURN_UNDEF; - PUSHs(&sv_yes); + PUSHs(&PL_sv_yes); -SV * +void await_signal() PREINIT: - char c; + unsigned char c; SSize_t ret; CODE: do { - ret = read(sig_pipe[1], &c, 1); + ret = read(sig_pipe[0], &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 + ST(0) = sv_newmortal(); + if (ret) + sv_setsv(ST(0), c ? PL_psig_ptr[c] : &PL_sv_no); + DEBUG_S(PerlIO_printf(Perl_debug_log, + "await_signal returning %s\n", SvPEEK(ST(0)))); + +MODULE = Thread PACKAGE = Thread::Specific + +void +data(classname = "Thread::Specific") + char * classname + PPCODE: