667 lines
16 KiB
Plaintext
667 lines
16 KiB
Plaintext
#define PERL_NO_GET_CONTEXT
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#include "EXTERN.h"
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#include "perl.h"
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#include "XSUB.h"
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/* Magic signature for Thread's mg_private is "Th" */
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#define Thread_MAGIC_SIGNATURE 0x5468
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#ifdef __cplusplus
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#ifdef I_UNISTD
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#include <unistd.h>
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#endif
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#endif
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#include <fcntl.h>
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static int sig_pipe[2];
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#ifndef THREAD_RET_TYPE
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#define THREAD_RET_TYPE void *
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#define THREAD_RET_CAST(x) ((THREAD_RET_TYPE) x)
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#endif
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static void
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remove_thread(pTHX_ struct perl_thread *t)
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{
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#ifdef USE_THREADS
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DEBUG_S(WITH_THR(PerlIO_printf(Perl_debug_log,
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"%p: remove_thread %p\n", thr, t)));
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MUTEX_LOCK(&PL_threads_mutex);
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MUTEX_DESTROY(&t->mutex);
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PL_nthreads--;
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t->prev->next = t->next;
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t->next->prev = t->prev;
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SvREFCNT_dec(t->oursv);
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COND_BROADCAST(&PL_nthreads_cond);
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MUTEX_UNLOCK(&PL_threads_mutex);
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#endif
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}
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static THREAD_RET_TYPE
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threadstart(void *arg)
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{
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#ifdef USE_THREADS
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#ifdef FAKE_THREADS
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Thread savethread = thr;
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LOGOP myop;
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dSP;
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I32 oldscope = PL_scopestack_ix;
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I32 retval;
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AV *av;
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int i;
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DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p starting at %s\n",
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thr, SvPEEK(TOPs)));
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thr = (Thread) arg;
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savemark = TOPMARK;
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thr->prev = thr->prev_run = savethread;
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thr->next = savethread->next;
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thr->next_run = savethread->next_run;
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savethread->next = savethread->next_run = thr;
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thr->wait_queue = 0;
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thr->private = 0;
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/* Now duplicate most of perl_call_sv but with a few twists */
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PL_op = (OP*)&myop;
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Zero(PL_op, 1, LOGOP);
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myop.op_flags = OPf_STACKED;
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myop.op_next = Nullop;
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myop.op_flags |= OPf_KNOW;
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myop.op_flags |= OPf_WANT_LIST;
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PL_op = pp_entersub(ARGS);
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DEBUG_S(if (!PL_op)
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PerlIO_printf(Perl_debug_log, "thread starts at Nullop\n"));
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/*
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* When this thread is next scheduled, we start in the right
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* place. When the thread runs off the end of the sub, perl.c
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* handles things, using savemark to figure out how much of the
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* stack is the return value for any join.
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*/
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thr = savethread; /* back to the old thread */
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return 0;
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#else
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Thread thr = (Thread) arg;
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LOGOP myop;
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djSP;
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I32 oldmark = TOPMARK;
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I32 oldscope = PL_scopestack_ix;
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I32 retval;
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SV *sv;
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AV *av;
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int i, ret;
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dJMPENV;
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#if defined(MULTIPLICITY)
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PERL_SET_INTERP(thr->interp);
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#endif
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DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p waiting to start\n",
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thr));
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/* Don't call *anything* requiring dTHR until after PERL_SET_THX() */
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/*
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* Wait until our creator releases us. If we didn't do this, then
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* it would be potentially possible for out thread to carry on and
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* do stuff before our creator fills in our "self" field. For example,
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* if we went and created another thread which tried to JOIN with us,
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* then we'd be in a mess.
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*/
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MUTEX_LOCK(&thr->mutex);
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MUTEX_UNLOCK(&thr->mutex);
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/*
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* It's safe to wait until now to set the thread-specific pointer
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* from our pthread_t structure to our struct perl_thread, since
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* we're the only thread who can get at it anyway.
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*/
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PERL_SET_THX(thr);
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/* Only now can we use SvPEEK (which calls sv_newmortal which does dTHR) */
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DEBUG_S(PerlIO_printf(Perl_debug_log, "new thread %p starting at %s\n",
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thr, SvPEEK(TOPs)));
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av = newAV();
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sv = POPs;
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PUTBACK;
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ENTER;
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SAVETMPS;
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perl_call_sv(sv, G_ARRAY|G_EVAL);
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SPAGAIN;
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retval = SP - (PL_stack_base + oldmark);
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SP = PL_stack_base + oldmark + 1;
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if (SvCUR(thr->errsv)) {
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MUTEX_LOCK(&thr->mutex);
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thr->flags |= THRf_DID_DIE;
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MUTEX_UNLOCK(&thr->mutex);
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av_store(av, 0, &PL_sv_no);
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av_store(av, 1, newSVsv(thr->errsv));
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DEBUG_S(PerlIO_printf(Perl_debug_log, "%p died: %s\n",
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thr, SvPV(thr->errsv, PL_na)));
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}
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else {
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DEBUG_S(STMT_START {
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for (i = 1; i <= retval; i++) {
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PerlIO_printf(Perl_debug_log, "%p return[%d] = %s\n",
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thr, i, SvPEEK(SP[i - 1]));
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}
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} STMT_END);
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av_store(av, 0, &PL_sv_yes);
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for (i = 1; i <= retval; i++, SP++)
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sv_setsv(*av_fetch(av, i, TRUE), SvREFCNT_inc(*SP));
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}
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FREETMPS;
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LEAVE;
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finishoff:
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#if 0
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/* removed for debug */
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SvREFCNT_dec(PL_curstack);
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#endif
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SvREFCNT_dec(thr->cvcache);
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SvREFCNT_dec(thr->threadsv);
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SvREFCNT_dec(thr->specific);
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SvREFCNT_dec(thr->errsv);
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/*Safefree(cxstack);*/
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while (PL_curstackinfo->si_next)
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PL_curstackinfo = PL_curstackinfo->si_next;
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while (PL_curstackinfo) {
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PERL_SI *p = PL_curstackinfo->si_prev;
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SvREFCNT_dec(PL_curstackinfo->si_stack);
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Safefree(PL_curstackinfo->si_cxstack);
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Safefree(PL_curstackinfo);
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PL_curstackinfo = p;
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}
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Safefree(PL_markstack);
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Safefree(PL_scopestack);
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Safefree(PL_savestack);
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Safefree(PL_retstack);
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Safefree(PL_tmps_stack);
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Safefree(PL_ofs);
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SvREFCNT_dec(PL_rs);
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SvREFCNT_dec(PL_nrs);
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SvREFCNT_dec(PL_statname);
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SvREFCNT_dec(PL_errors);
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Safefree(PL_screamfirst);
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Safefree(PL_screamnext);
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Safefree(PL_reg_start_tmp);
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SvREFCNT_dec(PL_lastscream);
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SvREFCNT_dec(PL_defoutgv);
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Safefree(PL_reg_poscache);
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MUTEX_LOCK(&thr->mutex);
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"%p: threadstart finishing: state is %u\n",
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thr, ThrSTATE(thr)));
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switch (ThrSTATE(thr)) {
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case THRf_R_JOINABLE:
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ThrSETSTATE(thr, THRf_ZOMBIE);
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MUTEX_UNLOCK(&thr->mutex);
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"%p: R_JOINABLE thread finished\n", thr));
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break;
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case THRf_R_JOINED:
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ThrSETSTATE(thr, THRf_DEAD);
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MUTEX_UNLOCK(&thr->mutex);
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remove_thread(aTHX_ thr);
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"%p: R_JOINED thread finished\n", thr));
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break;
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case THRf_R_DETACHED:
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ThrSETSTATE(thr, THRf_DEAD);
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MUTEX_UNLOCK(&thr->mutex);
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SvREFCNT_dec(av);
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"%p: DETACHED thread finished\n", thr));
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remove_thread(aTHX_ thr); /* This might trigger main thread to finish */
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break;
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default:
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MUTEX_UNLOCK(&thr->mutex);
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croak("panic: illegal state %u at end of threadstart", ThrSTATE(thr));
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/* NOTREACHED */
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}
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return THREAD_RET_CAST(av); /* Available for anyone to join with */
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/* us unless we're detached, in which */
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/* case noone sees the value anyway. */
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#endif
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#else
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return THREAD_RET_CAST(NULL);
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#endif
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}
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static SV *
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newthread (pTHX_ SV *startsv, AV *initargs, char *classname)
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{
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#ifdef USE_THREADS
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dSP;
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Thread savethread;
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int i;
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SV *sv;
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int err;
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#ifndef THREAD_CREATE
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static pthread_attr_t attr;
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static int attr_inited = 0;
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sigset_t fullmask, oldmask;
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static int attr_joinable = PTHREAD_CREATE_JOINABLE;
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#endif
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savethread = thr;
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thr = new_struct_thread(thr);
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/* temporarily pretend to be the child thread in case the
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* XPUSHs() below want to grow the child's stack. This is
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* safe, since the other thread is not yet created, and we
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* are the only ones who know about it */
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PERL_SET_THX(thr);
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SPAGAIN;
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"%p: newthread (%p), tid is %u, preparing stack\n",
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savethread, thr, thr->tid));
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/* The following pushes the arg list and startsv onto the *new* stack */
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PUSHMARK(SP);
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/* Could easily speed up the following greatly */
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for (i = 0; i <= AvFILL(initargs); i++)
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XPUSHs(SvREFCNT_inc(*av_fetch(initargs, i, FALSE)));
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XPUSHs(SvREFCNT_inc(startsv));
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PUTBACK;
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/* On your marks... */
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PERL_SET_THX(savethread);
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MUTEX_LOCK(&thr->mutex);
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#ifdef THREAD_CREATE
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err = THREAD_CREATE(thr, threadstart);
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#else
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/* Get set... */
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sigfillset(&fullmask);
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if (sigprocmask(SIG_SETMASK, &fullmask, &oldmask) == -1)
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croak("panic: sigprocmask");
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err = 0;
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if (!attr_inited) {
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attr_inited = 1;
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err = pthread_attr_init(&attr);
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# ifdef PTHREAD_ATTR_SETDETACHSTATE
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if (err == 0)
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err = PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
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# else
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croak("panic: can't pthread_attr_setdetachstate");
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# endif
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}
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if (err == 0)
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err = PTHREAD_CREATE(&thr->self, attr, threadstart, (void*) thr);
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#endif
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if (err) {
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MUTEX_UNLOCK(&thr->mutex);
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"%p: create of %p failed %d\n",
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savethread, thr, err));
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/* Thread creation failed--clean up */
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SvREFCNT_dec(thr->cvcache);
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remove_thread(aTHX_ thr);
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for (i = 0; i <= AvFILL(initargs); i++)
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SvREFCNT_dec(*av_fetch(initargs, i, FALSE));
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SvREFCNT_dec(startsv);
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return NULL;
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}
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#ifdef THREAD_POST_CREATE
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THREAD_POST_CREATE(thr);
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#else
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if (sigprocmask(SIG_SETMASK, &oldmask, 0))
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croak("panic: sigprocmask");
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#endif
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sv = newSViv(thr->tid);
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sv_magic(sv, thr->oursv, '~', 0, 0);
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SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
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sv = sv_bless(newRV_noinc(sv), gv_stashpv(classname, TRUE));
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/* Go */
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MUTEX_UNLOCK(&thr->mutex);
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return sv;
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#else
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croak("No threads in this perl");
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return &PL_sv_undef;
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#endif
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}
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static Signal_t handle_thread_signal (int sig);
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static Signal_t
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handle_thread_signal(int sig)
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{
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dTHXo;
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unsigned char c = (unsigned char) sig;
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/*
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* We're not really allowed to call fprintf in a signal handler
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* so don't be surprised if this isn't robust while debugging
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* with -DL.
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*/
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"handle_thread_signal: got signal %d\n", sig););
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write(sig_pipe[1], &c, 1);
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}
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MODULE = Thread PACKAGE = Thread
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PROTOTYPES: DISABLE
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void
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new(classname, startsv, ...)
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char * classname
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SV * startsv
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AV * av = av_make(items - 2, &ST(2));
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PPCODE:
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XPUSHs(sv_2mortal(newthread(aTHX_ startsv, av, classname)));
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void
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join(t)
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Thread t
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AV * av = NO_INIT
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int i = NO_INIT
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PPCODE:
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#ifdef USE_THREADS
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if (t == thr)
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croak("Attempt to join self");
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DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: joining %p (state %u)\n",
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thr, t, ThrSTATE(t)););
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MUTEX_LOCK(&t->mutex);
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switch (ThrSTATE(t)) {
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case THRf_R_JOINABLE:
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case THRf_R_JOINED:
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ThrSETSTATE(t, THRf_R_JOINED);
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MUTEX_UNLOCK(&t->mutex);
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break;
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case THRf_ZOMBIE:
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ThrSETSTATE(t, THRf_DEAD);
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MUTEX_UNLOCK(&t->mutex);
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remove_thread(aTHX_ t);
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break;
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default:
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MUTEX_UNLOCK(&t->mutex);
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croak("can't join with thread");
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/* NOTREACHED */
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}
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JOIN(t, &av);
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sv_2mortal((SV*)av);
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if (SvTRUE(*av_fetch(av, 0, FALSE))) {
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/* Could easily speed up the following if necessary */
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for (i = 1; i <= AvFILL(av); i++)
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XPUSHs(*av_fetch(av, i, FALSE));
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}
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else {
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STRLEN n_a;
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char *mess = SvPV(*av_fetch(av, 1, FALSE), n_a);
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DEBUG_S(PerlIO_printf(Perl_debug_log,
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"%p: join propagating die message: %s\n",
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thr, mess));
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croak(mess);
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}
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#endif
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void
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detach(t)
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Thread t
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CODE:
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#ifdef USE_THREADS
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DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: detaching %p (state %u)\n",
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thr, t, ThrSTATE(t)););
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MUTEX_LOCK(&t->mutex);
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switch (ThrSTATE(t)) {
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case THRf_R_JOINABLE:
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ThrSETSTATE(t, THRf_R_DETACHED);
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/* fall through */
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case THRf_R_DETACHED:
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DETACH(t);
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MUTEX_UNLOCK(&t->mutex);
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break;
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case THRf_ZOMBIE:
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ThrSETSTATE(t, THRf_DEAD);
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DETACH(t);
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MUTEX_UNLOCK(&t->mutex);
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remove_thread(aTHX_ t);
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break;
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default:
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MUTEX_UNLOCK(&t->mutex);
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croak("can't detach thread");
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/* NOTREACHED */
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}
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#endif
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void
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equal(t1, t2)
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Thread t1
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Thread t2
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PPCODE:
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PUSHs((t1 == t2) ? &PL_sv_yes : &PL_sv_no);
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void
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flags(t)
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Thread t
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PPCODE:
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#ifdef USE_THREADS
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PUSHs(sv_2mortal(newSViv(t->flags)));
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#endif
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void
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self(classname)
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char * classname
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PREINIT:
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SV *sv;
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PPCODE:
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#ifdef USE_THREADS
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sv = newSViv(thr->tid);
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sv_magic(sv, thr->oursv, '~', 0, 0);
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SvMAGIC(sv)->mg_private = Thread_MAGIC_SIGNATURE;
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PUSHs(sv_2mortal(sv_bless(newRV_noinc(sv),
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gv_stashpv(classname, TRUE))));
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#endif
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U32
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tid(t)
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Thread t
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CODE:
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#ifdef USE_THREADS
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MUTEX_LOCK(&t->mutex);
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RETVAL = t->tid;
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MUTEX_UNLOCK(&t->mutex);
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#else
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RETVAL = 0;
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#endif
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OUTPUT:
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RETVAL
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void
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DESTROY(t)
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SV * t
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PPCODE:
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PUSHs(&PL_sv_yes);
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void
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yield()
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CODE:
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{
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#ifdef USE_THREADS
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YIELD;
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#endif
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}
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void
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cond_wait(sv)
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SV * sv
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MAGIC * mg = NO_INIT
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CODE:
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#ifdef USE_THREADS
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if (SvROK(sv))
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sv = SvRV(sv);
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mg = condpair_magic(sv);
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DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: cond_wait %p\n", thr, sv));
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MUTEX_LOCK(MgMUTEXP(mg));
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|
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(Perl_debug_log, "%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(Perl_debug_log, "%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 ? 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:
|
|
#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
|