466 lines
16 KiB
C
466 lines
16 KiB
C
/************************************************************************
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** **
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** The YapTab/YapOr/OPTYap systems **
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** **
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** YapTab extends the Yap Prolog engine to support sequential tabling **
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** YapOr extends the Yap Prolog engine to support or-parallelism **
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** OPTYap extends the Yap Prolog engine to support or-parallel tabling **
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** **
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** **
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** Yap Prolog was developed at University of Porto, Portugal **
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** **
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************************************************************************/
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/***********************
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** Includes **
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***********************/
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#include "Yap.h"
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#ifdef TABLING
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "tab.macros.h"
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#ifdef YAPOR
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#include "or.macros.h"
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#endif /* YAPOR */
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/******************************
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** Local functions **
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******************************/
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#ifdef YAPOR
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static void complete_suspension_branch(susp_fr_ptr susp_fr, choiceptr top_cp, or_fr_ptr *chain_or_fr, dep_fr_ptr *chain_dep_fr) {
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or_fr_ptr aux_or_fr;
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sg_fr_ptr aux_sg_fr;
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dep_fr_ptr aux_dep_fr;
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/* complete all subgoals */
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aux_dep_fr = SuspFr_top_dep_fr(susp_fr);
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aux_sg_fr = SuspFr_top_sg_fr(susp_fr);
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if (DepFr_leader_dep_is_on_stack(aux_dep_fr)) {
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while (aux_sg_fr &&
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/* continue if the subgoal was early completed */
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/* SgFr_state(aux_sg_fr) == evaluating && */
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(SgFr_state(aux_sg_fr) == evaluating || SgFr_first_answer(aux_sg_fr) == SgFr_answer_trie(aux_sg_fr)) &&
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EQUAL_OR_YOUNGER_CP(SgFr_gen_cp(aux_sg_fr), top_cp)) {
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mark_as_completed(aux_sg_fr);
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aux_sg_fr = SgFr_next(aux_sg_fr);
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}
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} else {
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while (aux_sg_fr &&
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/* continue if the subgoal was early completed */
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/* SgFr_state(aux_sg_fr) == evaluating && */
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(SgFr_state(aux_sg_fr) == evaluating || SgFr_first_answer(aux_sg_fr) == SgFr_answer_trie(aux_sg_fr)) &&
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YOUNGER_CP(SgFr_gen_cp(aux_sg_fr), top_cp)) {
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mark_as_completed(aux_sg_fr);
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aux_sg_fr = SgFr_next(aux_sg_fr);
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}
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}
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/* chain dependency frames to release (using DepFr_next) */
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while (IS_UNLOCKED_DEP_FR(aux_dep_fr) &&
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YOUNGER_CP(DepFr_cons_cp(aux_dep_fr), top_cp)) {
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dep_fr_ptr next_dep_fr;
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LOCK_DEP_FR(aux_dep_fr);
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next_dep_fr = DepFr_next(aux_dep_fr);
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DepFr_next(aux_dep_fr) = *chain_dep_fr;
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*chain_dep_fr = aux_dep_fr;
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aux_dep_fr = next_dep_fr;
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}
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/* chain or-frames to release (using OrFr_next_on_stack) **
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** we use the OrFr_next_on_stack field instead of OrFr_next **
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** to avoid conflicts with the 'find_dependency_node' macro */
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aux_or_fr = SuspFr_top_or_fr_on_stack(susp_fr);
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while (IS_UNLOCKED(OrFr_lock(aux_or_fr))) {
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susp_fr_ptr aux_susp_fr;
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or_fr_ptr next_or_fr_on_stack;
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OPTYAP_ERROR_CHECKING(complete_suspension_branch, YOUNGER_CP(top_cp, GetOrFr_node(aux_or_fr)));
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LOCK_OR_FRAME(aux_or_fr);
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aux_susp_fr = OrFr_suspensions(aux_or_fr);
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while (aux_susp_fr) {
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susp_fr_ptr next_susp_fr;
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complete_suspension_branch(aux_susp_fr, GetOrFr_node(aux_or_fr), chain_or_fr, chain_dep_fr);
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next_susp_fr = SuspFr_next(aux_susp_fr);
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FREE_SUSPENSION_FRAME(aux_susp_fr);
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aux_susp_fr = next_susp_fr;
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}
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next_or_fr_on_stack = OrFr_next_on_stack(aux_or_fr);
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OrFr_next_on_stack(aux_or_fr) = *chain_or_fr;
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*chain_or_fr = aux_or_fr;
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aux_or_fr = next_or_fr_on_stack;
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}
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return;
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}
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#endif /* YAPOR */
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/*******************************
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** Global functions **
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*******************************/
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void private_completion(sg_fr_ptr sg_fr) {
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CACHE_REGS
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/* complete subgoals */
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#ifdef LIMIT_TABLING
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sg_fr_ptr aux_sg_fr;
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while (LOCAL_top_sg_fr != sg_fr) {
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aux_sg_fr = LOCAL_top_sg_fr;
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LOCAL_top_sg_fr = SgFr_next(aux_sg_fr);
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mark_as_completed(aux_sg_fr);
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insert_into_global_sg_fr_list(aux_sg_fr);
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}
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aux_sg_fr = LOCAL_top_sg_fr;
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LOCAL_top_sg_fr = SgFr_next(aux_sg_fr);
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mark_as_completed(aux_sg_fr);
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insert_into_global_sg_fr_list(aux_sg_fr);
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#else
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while (LOCAL_top_sg_fr != sg_fr) {
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mark_as_completed(LOCAL_top_sg_fr);
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LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
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}
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mark_as_completed(LOCAL_top_sg_fr);
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LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
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#endif /* LIMIT_TABLING */
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/* release dependency frames */
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while (EQUAL_OR_YOUNGER_CP(DepFr_cons_cp(LOCAL_top_dep_fr), B)) { /* never equal if batched scheduling */
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dep_fr_ptr dep_fr = DepFr_next(LOCAL_top_dep_fr);
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FREE_DEPENDENCY_FRAME(LOCAL_top_dep_fr);
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LOCAL_top_dep_fr = dep_fr;
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}
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/* adjust freeze registers */
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adjust_freeze_registers();
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/* adjust thread dependency */
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#ifdef THREADS_CONSUMER_SHARING
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ThDepFr_state(GLOBAL_th_dep_fr(worker_id)) = working;
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ThDepFr_next(GLOBAL_th_dep_fr(worker_id)) = worker_id;
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#endif /* THREADS_CONSUMER_SHARING */
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return;
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}
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#ifdef YAPOR
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void public_completion(void) {
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CACHE_REGS
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dep_fr_ptr chain_dep_fr, next_dep_fr;
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or_fr_ptr chain_or_fr, top_or_fr, next_or_fr;
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susp_fr_ptr susp_fr, next_susp_fr;
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qg_sol_fr_ptr solutions, aux_solutions;
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if (YOUNGER_CP(Get_LOCAL_top_cp(), B_FZ)) {
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/* the current node is a generator node without younger consumer **
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** nodes --> we only have the current node to complete */
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sg_fr_ptr top_sg_fr;
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/* complete subgoals */
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#ifdef DETERMINISTIC_TABLING
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if (IS_DET_GEN_CP(Get_LOCAL_top_cp()))
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top_sg_fr = SgFr_next(DET_GEN_CP(Get_LOCAL_top_cp())->cp_sg_fr);
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else
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#endif /* DETERMINISTIC_TABLING */
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top_sg_fr = SgFr_next(GEN_CP(Get_LOCAL_top_cp())->cp_sg_fr);
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do {
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mark_as_completed(LOCAL_top_sg_fr);
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LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
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} while (LOCAL_top_sg_fr != top_sg_fr);
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/* no dependency frames to release */
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chain_dep_fr = NULL;
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/* no need to adjust freeze registers */
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} else {
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/* the current node is a leader node with younger consumer **
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** nodes ---> we need to complete all dependent subgoals */
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/* complete subgoals */
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if (DepFr_leader_dep_is_on_stack(LOCAL_top_dep_fr)) {
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while (LOCAL_top_sg_fr &&
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EQUAL_OR_YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), Get_LOCAL_top_cp())) {
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mark_as_completed(LOCAL_top_sg_fr);
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LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
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}
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} else {
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while (LOCAL_top_sg_fr &&
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YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), Get_LOCAL_top_cp())) {
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mark_as_completed(LOCAL_top_sg_fr);
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LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
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}
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}
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/* chain dependency frames to release */
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chain_dep_fr = NULL;
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while (YOUNGER_CP(DepFr_cons_cp(LOCAL_top_dep_fr), Get_LOCAL_top_cp())) {
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LOCK_DEP_FR(LOCAL_top_dep_fr);
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next_dep_fr = DepFr_next(LOCAL_top_dep_fr);
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DepFr_next(LOCAL_top_dep_fr) = chain_dep_fr;
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chain_dep_fr = LOCAL_top_dep_fr;
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LOCAL_top_dep_fr = next_dep_fr;
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}
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/* adjust freeze registers */
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adjust_freeze_registers();
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}
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/* chain or-frames to release */
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chain_or_fr = NULL;
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top_or_fr = Get_LOCAL_top_cp_on_stack()->cp_or_fr;
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while (top_or_fr != LOCAL_top_or_fr) {
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or_fr_ptr next_or_fr_on_stack;
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LOCK_OR_FRAME(top_or_fr);
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susp_fr = OrFr_suspensions(top_or_fr);
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while (susp_fr) {
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complete_suspension_branch(susp_fr, GetOrFr_node(top_or_fr), &chain_or_fr, &chain_dep_fr);
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next_susp_fr = SuspFr_next(susp_fr);
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FREE_SUSPENSION_FRAME(susp_fr);
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susp_fr = next_susp_fr;
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}
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next_or_fr_on_stack = OrFr_next_on_stack(top_or_fr);
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OrFr_next_on_stack(top_or_fr) = chain_or_fr;
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chain_or_fr = top_or_fr;
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top_or_fr = next_or_fr_on_stack;
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}
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LOCK_OR_FRAME(top_or_fr);
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susp_fr = OrFr_suspensions(top_or_fr);
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while (susp_fr) {
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complete_suspension_branch(susp_fr, GetOrFr_node(top_or_fr), &chain_or_fr, &chain_dep_fr);
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next_susp_fr = SuspFr_next(susp_fr);
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FREE_SUSPENSION_FRAME(susp_fr);
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susp_fr = next_susp_fr;
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}
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OrFr_suspensions(top_or_fr) = NULL;
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OrFr_nearest_suspnode(top_or_fr) = top_or_fr;
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UNLOCK_OR_FRAME(top_or_fr);
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/* release dependency frames */
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while (chain_dep_fr) {
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next_dep_fr = DepFr_next(chain_dep_fr);
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FREE_DEPENDENCY_FRAME(chain_dep_fr);
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chain_dep_fr = next_dep_fr;
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}
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/* release or frames */
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solutions = NULL;
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while (chain_or_fr) {
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aux_solutions = OrFr_qg_solutions(chain_or_fr);
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if (aux_solutions) {
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CUT_join_answers_in_an_unique_frame(aux_solutions);
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SolFr_next(aux_solutions) = solutions;
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solutions = aux_solutions;
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}
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next_or_fr = OrFr_next_on_stack(chain_or_fr);
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FREE_OR_FRAME(chain_or_fr);
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chain_or_fr = next_or_fr;
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}
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if (solutions) {
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CUT_join_answers_in_an_unique_frame(solutions);
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SolFr_next(solutions) = OrFr_qg_solutions(LOCAL_top_or_fr);
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OrFr_qg_solutions(LOCAL_top_or_fr) = solutions;
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}
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/* adjust top register */
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Set_LOCAL_top_cp_on_stack( Get_LOCAL_top_cp() );
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return;
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}
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void complete_suspension_frames(or_fr_ptr or_fr) {
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CACHE_REGS
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dep_fr_ptr chain_dep_fr;
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or_fr_ptr chain_or_fr;
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susp_fr_ptr susp_fr;
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qg_sol_fr_ptr solutions;
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/* complete suspension frames */
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chain_dep_fr = NULL;
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chain_or_fr = NULL;
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susp_fr = OrFr_suspensions(or_fr);
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do {
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susp_fr_ptr next_susp_fr;
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complete_suspension_branch(susp_fr, GetOrFr_node(or_fr), &chain_or_fr, &chain_dep_fr);
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next_susp_fr = SuspFr_next(susp_fr);
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FREE_SUSPENSION_FRAME(susp_fr);
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susp_fr = next_susp_fr;
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} while (susp_fr);
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OrFr_suspensions(or_fr) = NULL;
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OrFr_nearest_suspnode(or_fr) = or_fr;
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/* release dependency frames */
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while (chain_dep_fr) {
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dep_fr_ptr next_dep_fr;
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next_dep_fr = DepFr_next(chain_dep_fr);
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FREE_DEPENDENCY_FRAME(chain_dep_fr);
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chain_dep_fr = next_dep_fr;
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}
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/* release or frames */
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solutions = NULL;
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while (chain_or_fr) {
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or_fr_ptr next_or_fr;
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qg_sol_fr_ptr aux_solutions;
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aux_solutions = OrFr_qg_solutions(chain_or_fr);
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if (aux_solutions) {
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CUT_join_answers_in_an_unique_frame(aux_solutions);
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SolFr_next(aux_solutions) = solutions;
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solutions = aux_solutions;
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}
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next_or_fr = OrFr_next_on_stack(chain_or_fr);
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FREE_OR_FRAME(chain_or_fr);
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chain_or_fr = next_or_fr;
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}
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if (solutions) {
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CUT_join_answers_in_an_unique_frame(solutions);
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SolFr_next(solutions) = OrFr_qg_solutions(or_fr);
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OrFr_qg_solutions(LOCAL_top_or_fr) = solutions;
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}
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return;
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}
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void suspend_branch(void) {
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CACHE_REGS
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or_fr_ptr or_frame;
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/* suspension only occurs in shared nodes that **
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** are leaders with younger consumer nodes */
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#ifdef DEBUG_OPTYAP
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OPTYAP_ERROR_CHECKING(suspend_branch, Get_LOCAL_top_cp()->cp_or_fr != LOCAL_top_or_fr);
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OPTYAP_ERROR_CHECKING(suspend_branch, B_FZ == Get_LOCAL_top_cp());
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OPTYAP_ERROR_CHECKING(suspend_branch, YOUNGER_CP(Get_LOCAL_top_cp(), Get_LOCAL_top_cp_on_stack()));
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OPTYAP_ERROR_CHECKING(suspend_branch, Get_LOCAL_top_cp()->cp_or_fr != LOCAL_top_or_fr);
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or_frame = Get_LOCAL_top_cp_on_stack()->cp_or_fr;
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while (or_frame != LOCAL_top_or_fr) {
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OPTYAP_ERROR_CHECKING(suspend_branch, YOUNGER_CP(Get_LOCAL_top_cp(), GetOrFr_node(or_frame)));
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or_frame = OrFr_next_on_stack(or_frame);
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}
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#endif /* DEBUG_OPTYAP */
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or_frame = Get_LOCAL_top_cp_on_stack()->cp_or_fr;
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LOCK_OR_FRAME(or_frame);
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if (B_FZ == Get_LOCAL_top_cp_on_stack() && OrFr_owners(or_frame) > 1) {
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/* there are other workers sharing the whole branch **
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** --> we can avoid suspension <-- */
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/* update shared nodes */
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OrFr_owners(or_frame)--;
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UNLOCK_OR_FRAME(or_frame);
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or_frame = OrFr_next_on_stack(or_frame);
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while (or_frame != LOCAL_top_or_fr) {
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LOCK_OR_FRAME(or_frame);
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OrFr_owners(or_frame)--;
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UNLOCK_OR_FRAME(or_frame);
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or_frame = OrFr_next_on_stack(or_frame);
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}
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} else {
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/* the branch has private parts **
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** --> suspend branch <-- */
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susp_fr_ptr new_susp_fr;
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long h_size, b_size, tr_size;
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UNLOCK_OR_FRAME(or_frame);
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/* alloc suspension frame */
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h_size = (unsigned long) H_FZ - (unsigned long) Get_LOCAL_top_cp()->cp_h;
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b_size = (unsigned long) Get_LOCAL_top_cp() - (unsigned long) B_FZ;
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tr_size = (unsigned long) TR_FZ - (unsigned long) Get_LOCAL_top_cp()->cp_tr;
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new_suspension_frame(new_susp_fr, Get_LOCAL_top_cp_on_stack()->cp_or_fr, LOCAL_top_dep_fr, LOCAL_top_sg_fr,
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Get_LOCAL_top_cp()->cp_h, B_FZ, Get_LOCAL_top_cp()->cp_tr, h_size, b_size, tr_size);
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/* store suspension frame in current top or-frame */
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LOCK_OR_FRAME(LOCAL_top_or_fr);
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if (OrFr_nearest_suspnode(LOCAL_top_or_fr) == LOCAL_top_or_fr)
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OrFr_nearest_suspnode(LOCAL_top_or_fr) = NULL;
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SuspFr_next(new_susp_fr) = OrFr_suspensions(LOCAL_top_or_fr);
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OrFr_suspensions(LOCAL_top_or_fr) = new_susp_fr;
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UNLOCK_OR_FRAME(LOCAL_top_or_fr);
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}
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/* adjust top pointers */
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while (LOCAL_top_sg_fr && YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), Get_LOCAL_top_cp_on_stack())) {
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SgFr_gen_worker(LOCAL_top_sg_fr) = MAX_WORKERS;
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LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
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}
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while (LOCAL_top_sg_fr && YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), Get_LOCAL_top_cp())) {
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LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
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}
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while (YOUNGER_CP(DepFr_cons_cp(LOCAL_top_dep_fr), Get_LOCAL_top_cp())) {
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LOCAL_top_dep_fr = DepFr_next(LOCAL_top_dep_fr);
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}
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Set_LOCAL_top_cp_on_stack( Get_LOCAL_top_cp() );
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/* adjust freeze registers */
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adjust_freeze_registers();
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return;
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}
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void resume_suspension_frame(susp_fr_ptr resume_fr, or_fr_ptr top_or_fr) {
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CACHE_REGS
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or_fr_ptr or_frame;
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sg_fr_ptr sg_frame;
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/* copy suspended stacks */
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memcpy(SuspFr_global_reg(resume_fr),
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SuspFr_global_start(resume_fr),
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SuspFr_global_size(resume_fr));
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memcpy(SuspFr_local_reg(resume_fr),
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SuspFr_local_start(resume_fr),
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SuspFr_local_size(resume_fr));
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memcpy(SuspFr_trail_reg(resume_fr),
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SuspFr_trail_start(resume_fr),
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SuspFr_trail_size(resume_fr));
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OPTYAP_ERROR_CHECKING(resume_suspension_frame, DepFr_cons_cp(SuspFr_top_dep_fr(resume_fr))->cp_h != SuspFr_global_reg(resume_fr) + SuspFr_global_size(resume_fr));
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OPTYAP_ERROR_CHECKING(resume_suspension_frame, DepFr_cons_cp(SuspFr_top_dep_fr(resume_fr))->cp_tr != SuspFr_trail_reg(resume_fr) + SuspFr_trail_size(resume_fr));
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OPTYAP_ERROR_CHECKING(resume_suspension_frame, DepFr_cons_cp(SuspFr_top_dep_fr(resume_fr)) != SuspFr_local_reg(resume_fr));
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OPTYAP_ERROR_CHECKING(resume_suspension_frame, (void *)Get_LOCAL_top_cp() < SuspFr_local_reg(resume_fr) + SuspFr_local_size(resume_fr));
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/* update shared nodes */
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or_frame = top_or_fr;
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while (or_frame != LOCAL_top_or_fr) {
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LOCK_OR_FRAME(or_frame);
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OrFr_owners(or_frame)++;
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UNLOCK_OR_FRAME(or_frame);
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or_frame = OrFr_next_on_stack(or_frame);
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}
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or_frame = top_or_fr;
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while (or_frame != LOCAL_top_or_fr) {
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LOCK_OR_FRAME(or_frame);
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BITMAP_insert(OrFr_members(or_frame), worker_id);
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BRANCH(worker_id, OrFr_depth(or_frame)) = 1;
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|
UNLOCK_OR_FRAME(or_frame);
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|
or_frame = OrFr_next(or_frame);
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}
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|
|
|
/* adjust top pointers */
|
|
LOCAL_top_or_fr = top_or_fr;
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SetOrFr_node(top_or_fr, Get_LOCAL_top_cp());
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LOCAL_top_sg_fr = SuspFr_top_sg_fr(resume_fr);
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|
LOCAL_top_dep_fr = SuspFr_top_dep_fr(resume_fr);
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Set_LOCAL_top_cp_on_stack( GetOrFr_node(SuspFr_top_or_fr_on_stack(resume_fr)) );
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sg_frame = LOCAL_top_sg_fr;
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|
while (sg_frame && YOUNGER_CP(SgFr_gen_cp(sg_frame), Get_LOCAL_top_cp_on_stack())) {
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|
SgFr_gen_worker(sg_frame) = worker_id;
|
|
sg_frame = SgFr_next(sg_frame);
|
|
}
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|
|
|
/* adjust freeze registers */
|
|
adjust_freeze_registers();
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|
|
|
/* free suspension frame */
|
|
FREE_SUSPENSION_FRAME(resume_fr);
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|
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return;
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}
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#endif /* YAPOR */
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#endif /* TABLING */
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