543 lines
18 KiB
C
543 lines
18 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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#if defined(THREADS) && defined(YAPOR)
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "or.macros.h"
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#ifdef TABLING
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#include "tab.macros.h"
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#else
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#include "opt.mavar.h"
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#endif /* TABLING */
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#define INCREMENTAL_COPYING 1
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#define COMPUTE_SEGMENTS_TO_COPY_TO(Q) \
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REMOTE_start_global_copy(Q) = (CELL) (REMOTE_top_cp(Q)->cp_h); \
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REMOTE_end_global_copy(Q) = (CELL) (B->cp_h); \
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REMOTE_start_local_copy(Q) = (CELL) (B); \
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REMOTE_end_local_copy(Q) = (CELL) (REMOTE_top_cp(Q)); \
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REMOTE_start_trail_copy(Q) = (CELL) (REMOTE_top_cp(Q)->cp_tr); \
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REMOTE_end_trail_copy(Q) = (CELL) (TR)
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/* ------------------------------------- **
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** Local functions declaration **
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** ------------------------------------- */
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static void share_private_nodes(int worker_q);
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/* ---------------------- **
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** Local macros **
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** ---------------------- */
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/* -------------------------- **
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** Global functions **
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** -------------------------- */
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void make_root_choice_point(void) {
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if (worker_id == 0) {
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SetOrFr_node(GLOBAL_root_or_fr, B);
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Set_LOCAL_top_cp(B);
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Set_GLOBAL_root_cp(B);
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} else {
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choiceptr imageB;
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Set_LOCAL_top_cp(Get_GLOBAL_root_cp());
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B = Get_GLOBAL_root_cp();
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/*
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this is tricky, we need to get the B from some other stack
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and convert back to our own stack;
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*/
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OldLCL0 = LCL0;
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LCL0 = FOREIGN_ThreadHandle(0).current_yaam_regs->LCL0_;
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imageB = Get_GLOBAL_root_cp();
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/* we know B */
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B->cp_tr = TR =
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(tr_fr_ptr)((CELL)(imageB->cp_tr)+((CELL)OldLCL0-(CELL)LCL0));
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LCL0 = OldLCL0;
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}
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B->cp_h = H0;
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B->cp_ap = GETWORK;
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B->cp_or_fr = GLOBAL_root_or_fr;
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LOCAL_top_or_fr = GLOBAL_root_or_fr;
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LOCAL_load = 0;
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Set_LOCAL_prune_request(NULL);
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BRANCH(worker_id, 0) = 0;
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#ifdef TABLING_INNER_CUTS
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LOCAL_pruning_scope = NULL;
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#endif /* TABLING_INNER_CUTS */
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#ifdef TABLING
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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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#endif /* TABLING */
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return;
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}
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void free_root_choice_point(void) {
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B = Get_LOCAL_top_cp()->cp_b;
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#ifdef TABLING
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Set_LOCAL_top_cp_on_stack((choiceptr) Yap_LocalBase);
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#endif /* TABLING */
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Set_GLOBAL_root_cp((choiceptr) Yap_LocalBase);
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Set_LOCAL_top_cp((choiceptr) Yap_LocalBase);
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SetOrFr_node(GLOBAL_root_or_fr, (choiceptr) Yap_LocalBase);
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return;
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}
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int p_share_work(void) {
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int worker_q = LOCAL_share_request;
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if (! BITMAP_member(OrFr_members(REMOTE_top_or_fr(worker_q)), worker_id) ||
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B == REMOTE_top_cp(worker_q) ||
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(LOCAL_load <= DELAYED_RELEASE_LOAD && OrFr_nearest_livenode(LOCAL_top_or_fr) == NULL)) {
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/* refuse sharing request */
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REMOTE_reply_signal(LOCAL_share_request) = no_sharing;
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LOCAL_share_request = MAX_WORKERS;
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PUT_OUT_REQUESTABLE(worker_id);
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return TRUE;
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}
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/* sharing request accepted */
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COMPUTE_SEGMENTS_TO_COPY_TO(worker_q);
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REMOTE_q_fase_signal(worker_q) = Q_idle;
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REMOTE_p_fase_signal(worker_q) = P_idle;
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#ifndef TABLING
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/* wait for incomplete installations */
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while (LOCAL_reply_signal != worker_ready);
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#endif /* TABLING */
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LOCAL_reply_signal = sharing;
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REMOTE_reply_signal(worker_q) = sharing;
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share_private_nodes(worker_q);
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REMOTE_reply_signal(worker_q) = nodes_shared;
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while (LOCAL_reply_signal == sharing);
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while (REMOTE_reply_signal(worker_q) != worker_ready);
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LOCAL_share_request = MAX_WORKERS;
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PUT_IN_REQUESTABLE(worker_id);
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return TRUE;
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}
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int q_share_work(int worker_p) {
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LOCK_OR_FRAME(LOCAL_top_or_fr);
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if (Get_REMOTE_prune_request(worker_p)) {
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/* worker p with prune request */
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UNLOCK_OR_FRAME(LOCAL_top_or_fr);
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return FALSE;
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}
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YAPOR_ERROR_CHECKING(q_share_work, Get_OrFr_pend_prune_cp(LOCAL_top_or_fr) && BRANCH_LTT(worker_p, OrFr_depth(LOCAL_top_or_fr)) < OrFr_pend_prune_ltt(LOCAL_top_or_fr));
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/* there is no pending prune with worker p at right --> safe move to worker p branch */
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BRANCH(worker_id, OrFr_depth(LOCAL_top_or_fr)) = BRANCH(worker_p, OrFr_depth(LOCAL_top_or_fr));
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Set_LOCAL_prune_request(NULL);
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UNLOCK_OR_FRAME(LOCAL_top_or_fr);
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OPTYAP_ERROR_CHECKING(q_share_work, Get_LOCAL_top_cp() != Get_LOCAL_top_cp_on_stack());
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OPTYAP_ERROR_CHECKING(q_share_work, YOUNGER_CP(B_FZ, Get_LOCAL_top_cp()));
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YAPOR_ERROR_CHECKING(q_share_work, LOCAL_reply_signal != worker_ready);
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/* make sharing request */
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LOCK_WORKER(worker_p);
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if (BITMAP_member(GLOBAL_bm_idle_workers, worker_p) ||
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REMOTE_share_request(worker_p) != MAX_WORKERS) {
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/* worker p is idle or has another request */
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UNLOCK_WORKER(worker_p);
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return FALSE;
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}
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REMOTE_share_request(worker_p) = worker_id;
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UNLOCK_WORKER(worker_p);
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/* wait for an answer */
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while (LOCAL_reply_signal == worker_ready);
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if (LOCAL_reply_signal == no_sharing) {
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/* sharing request refused */
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LOCAL_reply_signal = worker_ready;
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return FALSE;
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}
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while (LOCAL_reply_signal == sharing);
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#if INCREMENTAL_COPYING
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Yap_CopyThreadStacks(worker_id, worker_p, TRUE);
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#else
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Yap_CopyThreadStacks(worker_id, worker_p, FALSE);
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#endif
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/* update registers and return */
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#ifndef TABLING
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REMOTE_reply_signal(worker_p) = worker_ready;
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#endif /* TABLING */
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LOCAL_reply_signal = worker_ready;
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PUT_IN_REQUESTABLE(worker_id);
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return TRUE;
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}
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/* ------------------------- **
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** Local functions **
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** ------------------------- */
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static
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void share_private_nodes(int worker_q) {
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choiceptr sharing_node = B;
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#ifdef DEBUG_OPTYAP
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OPTYAP_ERROR_CHECKING(share_private_nodes, YOUNGER_CP(Get_LOCAL_top_cp(), Get_LOCAL_top_cp_on_stack()));
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{ choiceptr aux_cp = B;
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while (aux_cp != Get_LOCAL_top_cp()) {
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OPTYAP_ERROR_CHECKING(share_private_nodes, YOUNGER_CP(Get_LOCAL_top_cp(), aux_cp));
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OPTYAP_ERROR_CHECKING(share_private_nodes, EQUAL_OR_YOUNGER_CP(Get_LOCAL_top_cp_on_stack(), aux_cp));
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aux_cp = aux_cp->cp_b;
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}
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}
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#endif /* DEBUG_OPTYAP */
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#ifdef TABLING
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/* check if the branch is already shared */
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if (EQUAL_OR_YOUNGER_CP(Get_LOCAL_top_cp_on_stack(), sharing_node)) {
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or_fr_ptr or_frame;
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sg_fr_ptr sg_frame;
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dep_fr_ptr dep_frame;
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#ifdef DEBUG_OPTYAP
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{ or_fr_ptr aux_or_fr;
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aux_or_fr = LOCAL_top_or_fr;
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while (aux_or_fr != REMOTE_top_or_fr(worker_q)) {
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OPTYAP_ERROR_CHECKING(share_private_nodes, YOUNGER_CP(GetOrFr_node(REMOTE_top_or_fr(worker_q)), GetOrFr_node(aux_or_fr)));
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aux_or_fr = OrFr_next_on_stack(aux_or_fr);
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}
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}
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#endif /* DEBUG_OPTYAP */
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/* update old shared nodes */
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or_frame = LOCAL_top_or_fr;
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while (or_frame != REMOTE_top_or_fr(worker_q)) {
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LOCK_OR_FRAME(or_frame);
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BRANCH(worker_q, OrFr_depth(or_frame)) = BRANCH(worker_id, OrFr_depth(or_frame));
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OrFr_owners(or_frame)++;
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if (BITMAP_member(OrFr_members(or_frame), worker_id))
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BITMAP_insert(OrFr_members(or_frame), worker_q);
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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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/* update worker Q top subgoal frame */
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sg_frame = LOCAL_top_sg_fr;
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while (sg_frame && YOUNGER_CP(SgFr_gen_cp(sg_frame), sharing_node)) {
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sg_frame = SgFr_next(sg_frame);
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}
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REMOTE_top_sg_fr(worker_q) = sg_frame;
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/* update worker Q top dependency frame */
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dep_frame = LOCAL_top_dep_fr;
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while (YOUNGER_CP(DepFr_cons_cp(dep_frame), sharing_node)) {
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dep_frame = DepFr_next(dep_frame);
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}
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REMOTE_top_dep_fr(worker_q) = dep_frame;
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/* update worker Q top shared nodes */
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Set_REMOTE_top_cp_on_stack(worker_q, Get_LOCAL_top_cp());
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Set_REMOTE_top_cp(worker_q, Get_LOCAL_top_cp());
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REMOTE_top_or_fr(worker_q) = LOCAL_top_or_fr;
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} else
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#endif /* TABLING */
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{
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int depth;
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bitmap bm_workers;
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or_fr_ptr or_frame, previous_or_frame;
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#ifdef TABLING
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choiceptr consumer_cp, next_node_on_branch;
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dep_fr_ptr dep_frame;
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sg_fr_ptr sg_frame;
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CELL *stack, *stack_limit;
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/* find top dependency frame above current choice point */
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dep_frame = LOCAL_top_dep_fr;
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while (EQUAL_OR_YOUNGER_CP(DepFr_cons_cp(dep_frame), sharing_node)) {
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dep_frame = DepFr_next(dep_frame);
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}
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/* initialize tabling auxiliary variables */
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consumer_cp = DepFr_cons_cp(dep_frame);
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next_node_on_branch = NULL;
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stack_limit = (CELL *)TR;
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stack = (CELL *)Yap_TrailTop;
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#endif /* TABLING */
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/* initialize auxiliary variables */
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BITMAP_clear(bm_workers);
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BITMAP_insert(bm_workers, worker_id);
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BITMAP_insert(bm_workers, worker_q);
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previous_or_frame = NULL;
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depth = OrFr_depth(LOCAL_top_or_fr);
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/* sharing loop */
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#ifdef TABLING
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while (YOUNGER_CP(sharing_node, Get_LOCAL_top_cp_on_stack())) {
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#else
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while (sharing_node != Get_LOCAL_top_cp()) {
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#endif /* TABLING */
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#ifdef DEBUG_OPTYAP
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if (next_node_on_branch) {
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choiceptr aux_cp = B;
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while (aux_cp != next_node_on_branch) {
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OPTYAP_ERROR_CHECKING(share_private_nodes, sharing_node == aux_cp);
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OPTYAP_ERROR_CHECKING(share_private_nodes, YOUNGER_CP(next_node_on_branch, aux_cp));
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aux_cp = aux_cp->cp_b;
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}
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} else {
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choiceptr aux_cp = B;
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while (aux_cp != sharing_node) {
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OPTYAP_ERROR_CHECKING(share_private_nodes, YOUNGER_CP(sharing_node, aux_cp));
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aux_cp = aux_cp->cp_b;
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}
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}
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#endif /* DEBUG_OPTYAP */
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ALLOC_OR_FRAME(or_frame);
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if (previous_or_frame) {
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#ifdef TABLING
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OrFr_next_on_stack(previous_or_frame) =
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#endif /* TABLING */
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OrFr_nearest_livenode(previous_or_frame) = OrFr_next(previous_or_frame) = or_frame;
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}
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previous_or_frame = or_frame;
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depth++;
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INIT_LOCK(OrFr_lock(or_frame));
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SetOrFr_node(or_frame, sharing_node);
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OrFr_alternative(or_frame) = sharing_node->cp_ap;
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Set_OrFr_pend_prune_cp(or_frame, NULL);
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OrFr_nearest_leftnode(or_frame) = LOCAL_top_or_fr;
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OrFr_qg_solutions(or_frame) = NULL;
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#ifdef TABLING_INNER_CUTS
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OrFr_tg_solutions(or_frame) = NULL;
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#endif /* TABLING_INNER_CUTS */
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#ifdef TABLING
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OrFr_suspensions(or_frame) = NULL;
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OrFr_nearest_suspnode(or_frame) = or_frame;
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OrFr_owners(or_frame) = 2;
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if (next_node_on_branch)
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BITMAP_clear(OrFr_members(or_frame));
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else
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#endif /* TABLING */
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OrFr_members(or_frame) = bm_workers;
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YAPOR_ERROR_CHECKING(share_private_nodes, sharing_node->cp_ap == GETWORK || sharing_node->cp_ap == GETWORK_SEQ);
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if (sharing_node->cp_ap && YAMOP_SEQ(sharing_node->cp_ap)) {
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sharing_node->cp_ap = GETWORK_SEQ;
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} else {
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sharing_node->cp_ap = GETWORK;
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}
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sharing_node->cp_or_fr = or_frame;
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sharing_node = sharing_node->cp_b;
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#ifdef TABLING
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/* when next_node_on_branch is not NULL the **
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** sharing_node belongs to a frozen branch. */
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if (YOUNGER_CP(consumer_cp, sharing_node)) {
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/* frozen stack segment */
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if (! next_node_on_branch)
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next_node_on_branch = sharing_node;
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STACK_PUSH_UP(or_frame, stack);
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STACK_CHECK_EXPAND(stack, stack_limit);
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STACK_PUSH_UP(sharing_node, stack); /* vsc: STACK_PUSH -> STACK_PUSH_UP? */
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STACK_CHECK_EXPAND(stack, stack_limit);
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sharing_node = consumer_cp;
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dep_frame = DepFr_next(dep_frame);
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consumer_cp = DepFr_cons_cp(dep_frame);
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} else if (consumer_cp == sharing_node) {
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dep_frame = DepFr_next(dep_frame);
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consumer_cp = DepFr_cons_cp(dep_frame);
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}
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if (next_node_on_branch == sharing_node)
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next_node_on_branch = NULL;
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#endif /* TABLING */
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OPTYAP_ERROR_CHECKING(share_private_nodes, next_node_on_branch && YOUNGER_CP(next_node_on_branch, sharing_node));
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}
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/* initialize last or-frame pointer */
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or_frame = sharing_node->cp_or_fr;
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if (previous_or_frame) {
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#ifdef TABLING
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OrFr_next_on_stack(previous_or_frame) =
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#endif /* TABLING */
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OrFr_nearest_livenode(previous_or_frame) = OrFr_next(previous_or_frame) = or_frame;
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}
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#ifdef TABLING
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/* update or-frames stored in auxiliary stack */
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while (STACK_NOT_EMPTY(stack, (CELL *)Yap_TrailTop)) {
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next_node_on_branch = (choiceptr) STACK_POP_DOWN(stack);
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or_frame = (or_fr_ptr) STACK_POP_DOWN(stack);
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OrFr_nearest_livenode(or_frame) = OrFr_next(or_frame) = next_node_on_branch->cp_or_fr;
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}
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#endif /* TABLING */
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/* update depth */
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if (depth >= MAX_BRANCH_DEPTH)
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Yap_Error(INTERNAL_ERROR, TermNil, "maximum depth exceded (share_private_nodes)");
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or_frame = B->cp_or_fr;
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#ifdef TABLING
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previous_or_frame = Get_LOCAL_top_cp_on_stack()->cp_or_fr;
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while (or_frame != previous_or_frame) {
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#else
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while (or_frame != LOCAL_top_or_fr) {
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#endif /* TABLING */
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unsigned int branch;
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if (OrFr_alternative(or_frame)) {
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branch = YAMOP_OR_ARG(OrFr_alternative(or_frame)) + 1;
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} else {
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branch = 1;
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}
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branch |= YAMOP_CUT_FLAG; /* in doubt, assume cut */
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BRANCH(worker_id, depth) = BRANCH(worker_q, depth) = branch;
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OrFr_depth(or_frame) = depth--;
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or_frame = OrFr_next_on_stack(or_frame);
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}
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YAPOR_ERROR_CHECKING(share_private_nodes, depth != OrFr_depth(LOCAL_top_or_fr));
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#ifdef DEBUG_OPTYAP
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{ or_fr_ptr aux_or_fr = B->cp_or_fr;
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choiceptr aux_cp;
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while (aux_or_fr != Get_LOCAL_top_cp_on_stack()->cp_or_fr) {
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aux_cp = GetOrFr_node(aux_or_fr);
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OPTYAP_ERROR_CHECKING(share_private_nodes, OrFr_next(aux_or_fr) != aux_cp->cp_b->cp_or_fr);
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OPTYAP_ERROR_CHECKING(share_private_nodes, OrFr_nearest_livenode(aux_or_fr) != aux_cp->cp_b->cp_or_fr);
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aux_or_fr = OrFr_next_on_stack(aux_or_fr);
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}
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aux_or_fr = B->cp_or_fr;
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while (aux_or_fr != Get_LOCAL_top_cp_on_stack()->cp_or_fr) {
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or_fr_ptr nearest_leftnode = OrFr_nearest_leftnode(aux_or_fr);
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aux_cp = GetOrFr_node(aux_or_fr);
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while (GetOrFr_node(nearest_leftnode) != aux_cp) {
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OPTYAP_ERROR_CHECKING(share_private_nodes, YOUNGER_CP(GetOrFr_node(nearest_leftnode), aux_cp));
|
|
aux_cp = aux_cp->cp_b;
|
|
}
|
|
aux_or_fr = OrFr_next_on_stack(aux_or_fr);
|
|
}
|
|
}
|
|
#endif /* DEBUG_OPTYAP */
|
|
|
|
/* update old shared nodes */
|
|
while (or_frame != REMOTE_top_or_fr(worker_q)) {
|
|
LOCK_OR_FRAME(or_frame);
|
|
BRANCH(worker_q, OrFr_depth(or_frame)) = BRANCH(worker_id, OrFr_depth(or_frame));
|
|
#ifdef TABLING
|
|
OrFr_owners(or_frame)++;
|
|
if (BITMAP_member(OrFr_members(or_frame), worker_id))
|
|
#endif /* TABLING */
|
|
BITMAP_insert(OrFr_members(or_frame), worker_q);
|
|
UNLOCK_OR_FRAME(or_frame);
|
|
or_frame = OrFr_next_on_stack(or_frame);
|
|
}
|
|
|
|
#ifdef TABLING
|
|
/* update subgoal frames in the maintained private branches */
|
|
sg_frame = LOCAL_top_sg_fr;
|
|
while (sg_frame && YOUNGER_CP(SgFr_gen_cp(sg_frame), B)) {
|
|
choiceptr top_cp_on_branch;
|
|
top_cp_on_branch = SgFr_gen_cp(sg_frame);
|
|
while (YOUNGER_CP(top_cp_on_branch, B)) {
|
|
top_cp_on_branch = top_cp_on_branch->cp_b;
|
|
}
|
|
SgFr_gen_top_or_fr(sg_frame) = top_cp_on_branch->cp_or_fr;
|
|
sg_frame = SgFr_next(sg_frame);
|
|
}
|
|
/* update worker Q top subgoal frame */
|
|
REMOTE_top_sg_fr(worker_q) = sg_frame;
|
|
/* update subgoal frames in the recently shared branches */
|
|
while (sg_frame && YOUNGER_CP(SgFr_gen_cp(sg_frame), Get_LOCAL_top_cp_on_stack())) {
|
|
SgFr_gen_worker(sg_frame) = MAX_WORKERS;
|
|
SgFr_gen_top_or_fr(sg_frame) = SgFr_gen_cp(sg_frame)->cp_or_fr;
|
|
sg_frame = SgFr_next(sg_frame);
|
|
}
|
|
|
|
/* update dependency frames in the maintained private branches */
|
|
dep_frame = LOCAL_top_dep_fr;
|
|
while (YOUNGER_CP(DepFr_cons_cp(dep_frame), B)) {
|
|
choiceptr top_cp_on_branch;
|
|
top_cp_on_branch = DepFr_cons_cp(dep_frame);
|
|
while (YOUNGER_CP(top_cp_on_branch, B)) {
|
|
top_cp_on_branch = top_cp_on_branch->cp_b;
|
|
}
|
|
DepFr_top_or_fr(dep_frame) = top_cp_on_branch->cp_or_fr;
|
|
dep_frame = DepFr_next(dep_frame);
|
|
}
|
|
/* update worker Q top dependency frame */
|
|
REMOTE_top_dep_fr(worker_q) = dep_frame;
|
|
/* update dependency frames in the recently shared branches */
|
|
while (YOUNGER_CP(DepFr_cons_cp(dep_frame), Get_LOCAL_top_cp_on_stack())) {
|
|
DepFr_top_or_fr(dep_frame) = DepFr_cons_cp(dep_frame)->cp_or_fr;
|
|
dep_frame = DepFr_next(dep_frame);
|
|
}
|
|
#endif /* TABLING */
|
|
|
|
#ifdef DEBUG_OPTYAP
|
|
{ dep_fr_ptr aux_dep_fr = LOCAL_top_dep_fr;
|
|
while(aux_dep_fr != GLOBAL_root_dep_fr) {
|
|
choiceptr top_cp_on_branch;
|
|
top_cp_on_branch = DepFr_cons_cp(aux_dep_fr);
|
|
while (YOUNGER_CP(top_cp_on_branch, B)) {
|
|
top_cp_on_branch = top_cp_on_branch->cp_b;
|
|
}
|
|
OPTYAP_ERROR_CHECKING(share_private_nodes, top_cp_on_branch->cp_or_fr != DepFr_top_or_fr(aux_dep_fr));
|
|
aux_dep_fr = DepFr_next(aux_dep_fr);
|
|
}
|
|
}
|
|
#endif /* DEBUG_OPTYAP */
|
|
|
|
/* update top shared nodes */
|
|
#ifdef TABLING
|
|
Set_REMOTE_top_cp_on_stack(worker_q,B);
|
|
Set_LOCAL_top_cp_on_stack( B );
|
|
#endif /* TABLING */
|
|
Set_REMOTE_top_cp(worker_q,B);
|
|
Set_LOCAL_top_cp(B);
|
|
REMOTE_top_or_fr(worker_q) = LOCAL_top_or_fr = Get_LOCAL_top_cp()->cp_or_fr;
|
|
}
|
|
|
|
#ifdef TABLING_INNER_CUTS
|
|
/* update worker Q pruning scope */
|
|
if (LOCAL_pruning_scope && EQUAL_OR_YOUNGER_CP(Get_LOCAL_top_cp(), LOCAL_pruning_scope)) {
|
|
REMOTE_pruning_scope(worker_q) = LOCAL_pruning_scope;
|
|
PUT_IN_PRUNING(worker_q);
|
|
} else {
|
|
PUT_OUT_PRUNING(worker_q);
|
|
REMOTE_pruning_scope(worker_q) = NULL;
|
|
}
|
|
#endif /* TABLING_INNER_CUTS */
|
|
|
|
/* update worker Q prune request */
|
|
if (Get_LOCAL_prune_request()) {
|
|
CUT_send_prune_request(worker_q, Get_LOCAL_prune_request());
|
|
}
|
|
|
|
/* update load and return */
|
|
REMOTE_load(worker_q) = LOCAL_load = 0;
|
|
return;
|
|
}
|
|
#endif /* ENV_COPY */
|