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yap-6.3/OPTYap/or.insts.i

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/************************************************************************
** **
** The YapTab/YapOr/OPTYap systems **
** **
** YapTab extends the Yap Prolog engine to support sequential tabling **
** YapOr extends the Yap Prolog engine to support or-parallelism **
** OPTYap extends the Yap Prolog engine to support or-parallel tabling **
** **
** **
** Yap Prolog was developed at University of Porto, Portugal **
** **
************************************************************************/
/* -------------------------------- **
** Scheduler instructions **
** -------------------------------- */
PBOp(getwork_first_time,e)
/* wait for a new parallel goal */
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while (BITMAP_same(Yap_bm_present_workers, Yap_bm_finished_workers));
make_root_choice_point();
PUT_IN_EXECUTING(worker_id);
/* wait until everyone else is executing! */
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while (! BITMAP_same(Yap_bm_present_workers, Yap_bm_executing_workers));
SCHEDULER_GET_WORK();
shared_end:
PUT_IN_FINISHED(worker_id);
/* wait until everyone else is finished! */
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while (! BITMAP_same(Yap_bm_present_workers, Yap_bm_finished_workers));
PUT_OUT_EXECUTING(worker_id);
if (worker_id == 0) {
finish_yapor();
free_root_choice_point();
/* wait until no one is executing */
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while (! BITMAP_empty(Yap_bm_executing_workers));
goto fail;
} else {
PREG = GETWORK_FIRST_TIME;
PREFETCH_OP(PREG);
GONext();
}
ENDPBOp();
PBOp(getwork,Otapl)
#ifdef TABLING
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if (DepFr_leader_cp(LOCAL_top_dep_fr) == Get_LOCAL_top_cp()) {
/* the current top node is a leader node with consumer nodes below */
if (DepFr_leader_dep_is_on_stack(LOCAL_top_dep_fr)) {
/* the frozen branch depends on the current top node **
** this means that the current top node is a generator node */
LOCK_OR_FRAME(LOCAL_top_or_fr);
if (OrFr_alternative(LOCAL_top_or_fr) == NULL ||
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(OrFr_alternative(LOCAL_top_or_fr) == ANSWER_RESOLUTION && B_FZ != Get_LOCAL_top_cp())) {
/* there are no unexploited alternatives **
** (NULL if batched scheduling OR ANSWER_RESOLUTION if local scheduling) */
UNLOCK_OR_FRAME(LOCAL_top_or_fr);
goto completion;
} else {
/* there are unexploited alternatives **
** we should exploit all the available alternatives before execute completion */
PREG = OrFr_alternative(LOCAL_top_or_fr);
PREFETCH_OP(PREG);
GONext();
}
/* ricroc - obsolete
#ifdef batched scheduling
if (OrFr_alternative(LOCAL_top_or_fr) != NULL) {
#else local scheduling
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if (OrFr_alternative(LOCAL_top_or_fr) != ANSWER_RESOLUTION || B_FZ == Get_LOCAL_top_cp()) {
#endif
PREG = OrFr_alternative(LOCAL_top_or_fr);
PREFETCH_OP(PREG);
GONext();
}
UNLOCK_OR_FRAME(LOCAL_top_or_fr);
*/
}
goto completion;
}
#endif /* TABLING */
LOCK_OR_FRAME(LOCAL_top_or_fr);
if (OrFr_alternative(LOCAL_top_or_fr)) {
PREG = OrFr_alternative(LOCAL_top_or_fr);
PREFETCH_OP(PREG);
GONext();
} else {
UNLOCK_OR_FRAME(LOCAL_top_or_fr);
SCHEDULER_GET_WORK();
}
ENDPBOp();
/* The idea is to check whether we are the last worker in the node.
If we are, we can go ahead, otherwise we should call the scheduler. */
PBOp(getwork_seq,Otapl)
LOCK_OR_FRAME(LOCAL_top_or_fr);
if (OrFr_alternative(LOCAL_top_or_fr) &&
BITMAP_alone(OrFr_members(LOCAL_top_or_fr), worker_id)) {
PREG = OrFr_alternative(LOCAL_top_or_fr);
PREFETCH_OP(PREG);
GONext();
} else {
UNLOCK_OR_FRAME(LOCAL_top_or_fr);
SCHEDULER_GET_WORK();
}
ENDPBOp();
PBOp(sync,Otapl)
CUT_wait_leftmost();
PREG = NEXTOP(PREG,Otapl);
PREFETCH_OP(PREG);
GONext();
ENDPBOp();