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yap-6.3/OPTYap/tab.suspend.c
ricroc b8546491fc copyright header in OPTYap files 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1315 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2005-05-31 08:24:24 +00:00

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14 KiB
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/**********************************************************************
The OPTYap Prolog system
OPTYap extends the Yap Prolog system to support or-parallel tabling
Copyright: R. Rocha and NCC - University of Porto, Portugal
File: tab.suspend.c
version: $Id: tab.suspend.c,v 1.4 2005-05-31 08:24:24 ricroc Exp $
**********************************************************************/
/* ------------------ **
** Includes **
** ------------------ */
#include "Yap.h"
#if defined(TABLING) && defined(YAPOR)
#include "Yatom.h"
#include "Heap.h"
#include "tab.macros.h"
#include "or.macros.h"
/* ------------------------------------- **
** Local functions declaration **
** ------------------------------------- */
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);
/* -------------------------- **
** Global functions **
** -------------------------- */
void public_completion(void) {
dep_fr_ptr chain_dep_fr, next_dep_fr;
or_fr_ptr chain_or_fr, top_or_fr, next_or_fr;
susp_fr_ptr susp_fr, next_susp_fr;
qg_sol_fr_ptr solutions, aux_solutions;
if (YOUNGER_CP(LOCAL_top_cp, B_FZ)) {
/* the current node is a generator node without younger consumer **
** nodes --> we only have the current node to complete */
sg_fr_ptr top_sg_fr;
/* complete subgoals */
top_sg_fr = SgFr_next(GEN_CP(LOCAL_top_cp)->cp_sg_fr);
do {
mark_as_completed(LOCAL_top_sg_fr);
LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
} while (LOCAL_top_sg_fr != top_sg_fr);
/* no dependency frames to release */
chain_dep_fr = NULL;
/* no need to adjust freeze registers */
} else {
/* the current node is a leader node with younger consumer **
** nodes ---> we need to complete all dependent subgoals */
/* complete subgoals */
if (DepFr_leader_dep_is_on_stack(LOCAL_top_dep_fr)) {
while (LOCAL_top_sg_fr &&
EQUAL_OR_YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), LOCAL_top_cp)) {
mark_as_completed(LOCAL_top_sg_fr);
LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
}
} else {
while (LOCAL_top_sg_fr &&
YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), LOCAL_top_cp)) {
mark_as_completed(LOCAL_top_sg_fr);
LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
}
}
/* chain dependency frames to release */
chain_dep_fr = NULL;
while (YOUNGER_CP(DepFr_cons_cp(LOCAL_top_dep_fr), LOCAL_top_cp)) {
LOCK(DepFr_lock(LOCAL_top_dep_fr));
next_dep_fr = DepFr_next(LOCAL_top_dep_fr);
DepFr_next(LOCAL_top_dep_fr) = chain_dep_fr;
chain_dep_fr = LOCAL_top_dep_fr;
LOCAL_top_dep_fr = next_dep_fr;
}
/* adjust freeze registers */
adjust_freeze_registers();
}
/* chain or-frames to release */
chain_or_fr = NULL;
top_or_fr = LOCAL_top_cp_on_stack->cp_or_fr;
while (top_or_fr != LOCAL_top_or_fr) {
or_fr_ptr next_or_fr_on_stack;
LOCK_OR_FRAME(top_or_fr);
susp_fr = OrFr_suspensions(top_or_fr);
while (susp_fr) {
complete_suspension_branch(susp_fr, OrFr_node(top_or_fr), &chain_or_fr, &chain_dep_fr);
next_susp_fr = SuspFr_next(susp_fr);
FREE_SUSPENSION_FRAME(susp_fr);
susp_fr = next_susp_fr;
}
next_or_fr_on_stack = OrFr_next_on_stack(top_or_fr);
OrFr_next_on_stack(top_or_fr) = chain_or_fr;
chain_or_fr = top_or_fr;
top_or_fr = next_or_fr_on_stack;
}
LOCK_OR_FRAME(top_or_fr);
susp_fr = OrFr_suspensions(top_or_fr);
while (susp_fr) {
complete_suspension_branch(susp_fr, OrFr_node(top_or_fr), &chain_or_fr, &chain_dep_fr);
next_susp_fr = SuspFr_next(susp_fr);
FREE_SUSPENSION_FRAME(susp_fr);
susp_fr = next_susp_fr;
}
OrFr_suspensions(top_or_fr) = NULL;
OrFr_nearest_suspnode(top_or_fr) = top_or_fr;
UNLOCK_OR_FRAME(top_or_fr);
/* release dependency frames */
while (chain_dep_fr) {
next_dep_fr = DepFr_next(chain_dep_fr);
FREE_DEPENDENCY_FRAME(chain_dep_fr);
chain_dep_fr = next_dep_fr;
}
/* release or frames */
solutions = NULL;
while (chain_or_fr) {
aux_solutions = OrFr_qg_solutions(chain_or_fr);
if (aux_solutions) {
CUT_join_answers_in_an_unique_frame(aux_solutions);
SolFr_next(aux_solutions) = solutions;
solutions = aux_solutions;
}
next_or_fr = OrFr_next_on_stack(chain_or_fr);
FREE_OR_FRAME(chain_or_fr);
chain_or_fr = next_or_fr;
}
if (solutions) {
CUT_join_answers_in_an_unique_frame(solutions);
SolFr_next(solutions) = OrFr_qg_solutions(LOCAL_top_or_fr);
OrFr_qg_solutions(LOCAL_top_or_fr) = solutions;
}
/* adjust top register */
LOCAL_top_cp_on_stack = LOCAL_top_cp;
return;
}
void complete_suspension_frames(or_fr_ptr or_fr) {
dep_fr_ptr chain_dep_fr;
or_fr_ptr chain_or_fr;
susp_fr_ptr susp_fr;
qg_sol_fr_ptr solutions;
/* complete suspension frames */
chain_dep_fr = NULL;
chain_or_fr = NULL;
susp_fr = OrFr_suspensions(or_fr);
do {
susp_fr_ptr next_susp_fr;
complete_suspension_branch(susp_fr, OrFr_node(or_fr), &chain_or_fr, &chain_dep_fr);
next_susp_fr = SuspFr_next(susp_fr);
FREE_SUSPENSION_FRAME(susp_fr);
susp_fr = next_susp_fr;
} while (susp_fr);
OrFr_suspensions(or_fr) = NULL;
OrFr_nearest_suspnode(or_fr) = or_fr;
/* release dependency frames */
while (chain_dep_fr) {
dep_fr_ptr next_dep_fr;
next_dep_fr = DepFr_next(chain_dep_fr);
FREE_DEPENDENCY_FRAME(chain_dep_fr);
chain_dep_fr = next_dep_fr;
}
/* release or frames */
solutions = NULL;
while (chain_or_fr) {
or_fr_ptr next_or_fr;
qg_sol_fr_ptr aux_solutions;
aux_solutions = OrFr_qg_solutions(chain_or_fr);
if (aux_solutions) {
CUT_join_answers_in_an_unique_frame(aux_solutions);
SolFr_next(aux_solutions) = solutions;
solutions = aux_solutions;
}
next_or_fr = OrFr_next_on_stack(chain_or_fr);
FREE_OR_FRAME(chain_or_fr);
chain_or_fr = next_or_fr;
}
if (solutions) {
CUT_join_answers_in_an_unique_frame(solutions);
SolFr_next(solutions) = OrFr_qg_solutions(or_fr);
OrFr_qg_solutions(LOCAL_top_or_fr) = solutions;
}
return;
}
void suspend_branch(void) {
or_fr_ptr or_frame;
/* suspension only occurs in shared nodes that **
** are leaders with younger consumer nodes */
#ifdef OPTYAP_ERRORS
if (LOCAL_top_cp->cp_or_fr != LOCAL_top_or_fr)
OPTYAP_ERROR_MESSAGE("LOCAL_top_cp->cp_or_fr != LOCAL_top_or_fr (suspend_branch)");
if (B_FZ == LOCAL_top_cp)
OPTYAP_ERROR_MESSAGE("B_FZ = LOCAL_top_cp (suspend_branch)");
if (YOUNGER_CP(LOCAL_top_cp, LOCAL_top_cp_on_stack))
OPTYAP_ERROR_MESSAGE("YOUNGER_CP(LOCAL_top_cp, LOCAL_top_cp_on_stack) (suspend_branch)");
if (LOCAL_top_cp->cp_or_fr != LOCAL_top_or_fr)
OPTYAP_ERROR_MESSAGE("LOCAL_top_cp->cp_or_fr != LOCAL_top_or_fr (suspend_branch)");
or_frame = LOCAL_top_cp_on_stack->cp_or_fr;
while (or_frame != LOCAL_top_or_fr) {
if (YOUNGER_CP(LOCAL_top_cp, OrFr_node(or_frame))) {
OPTYAP_ERROR_MESSAGE("YOUNGER_CP(LOCAL_top_cp, OrFr_node(or_frame)) (suspend_branch)");
break;
}
or_frame = OrFr_next_on_stack(or_frame);
}
#endif /* OPTYAP_ERRORS */
or_frame = LOCAL_top_cp_on_stack->cp_or_fr;
LOCK_OR_FRAME(or_frame);
if (B_FZ == LOCAL_top_cp_on_stack && OrFr_owners(or_frame) > 1) {
/* there are other workers sharing the whole branch **
** --> we can avoid suspension <-- */
/* update shared nodes */
OrFr_owners(or_frame)--;
UNLOCK_OR_FRAME(or_frame);
or_frame = OrFr_next_on_stack(or_frame);
while (or_frame != LOCAL_top_or_fr) {
LOCK_OR_FRAME(or_frame);
OrFr_owners(or_frame)--;
UNLOCK_OR_FRAME(or_frame);
or_frame = OrFr_next_on_stack(or_frame);
}
} else {
/* the branch has private parts **
** --> suspend branch <-- */
susp_fr_ptr new_susp_fr;
long h_size, b_size, tr_size;
UNLOCK_OR_FRAME(or_frame);
/* alloc suspension frame */
h_size = (unsigned long) H_FZ - (unsigned long) LOCAL_top_cp->cp_h;
b_size = (unsigned long) LOCAL_top_cp - (unsigned long) B_FZ;
tr_size = (unsigned long) TR_FZ - (unsigned long) LOCAL_top_cp->cp_tr;
new_suspension_frame(new_susp_fr, LOCAL_top_cp_on_stack->cp_or_fr, LOCAL_top_dep_fr, LOCAL_top_sg_fr,
LOCAL_top_cp->cp_h, B_FZ, LOCAL_top_cp->cp_tr, h_size, b_size, tr_size);
/* store suspension frame in current top or-frame */
LOCK_OR_FRAME(LOCAL_top_or_fr);
if (OrFr_nearest_suspnode(LOCAL_top_or_fr) == LOCAL_top_or_fr)
OrFr_nearest_suspnode(LOCAL_top_or_fr) = NULL;
SuspFr_next(new_susp_fr) = OrFr_suspensions(LOCAL_top_or_fr);
OrFr_suspensions(LOCAL_top_or_fr) = new_susp_fr;
UNLOCK_OR_FRAME(LOCAL_top_or_fr);
}
/* adjust top pointers */
while (LOCAL_top_sg_fr && YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), LOCAL_top_cp_on_stack)) {
SgFr_gen_worker(LOCAL_top_sg_fr) = MAX_WORKERS;
LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
}
while (LOCAL_top_sg_fr && YOUNGER_CP(SgFr_gen_cp(LOCAL_top_sg_fr), LOCAL_top_cp)) {
LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
}
while (YOUNGER_CP(DepFr_cons_cp(LOCAL_top_dep_fr), LOCAL_top_cp)) {
LOCAL_top_dep_fr = DepFr_next(LOCAL_top_dep_fr);
}
LOCAL_top_cp_on_stack = LOCAL_top_cp;
/* adjust freeze registers */
adjust_freeze_registers();
return;
}
void resume_suspension_frame(susp_fr_ptr resume_fr, or_fr_ptr top_or_fr) {
or_fr_ptr or_frame;
sg_fr_ptr sg_frame;
/* copy suspended stacks */
memcpy(SuspFr_global_reg(resume_fr),
SuspFr_global_start(resume_fr),
SuspFr_global_size(resume_fr));
memcpy(SuspFr_local_reg(resume_fr),
SuspFr_local_start(resume_fr),
SuspFr_local_size(resume_fr));
memcpy(SuspFr_trail_reg(resume_fr),
SuspFr_trail_start(resume_fr),
SuspFr_trail_size(resume_fr));
#ifdef OPTYAP_ERRORS
if (DepFr_cons_cp(SuspFr_top_dep_fr(resume_fr))->cp_h != SuspFr_global_reg(resume_fr) + SuspFr_global_size(resume_fr))
OPTYAP_ERROR_MESSAGE("DepFr_cons_cp(SuspFr_top_dep_fr)->cp_h != SuspFr_global_reg + SuspFr_global_size (resume_suspension_frame)");
if (DepFr_cons_cp(SuspFr_top_dep_fr(resume_fr))->cp_tr != SuspFr_trail_reg(resume_fr) + SuspFr_trail_size(resume_fr))
OPTYAP_ERROR_MESSAGE("DepFr_cons_cp(SuspFr_top_dep_fr)->cp_tr != SuspFr_trail_reg + SuspFr_trail_size (resume_suspension_frame)");
if (DepFr_cons_cp(SuspFr_top_dep_fr(resume_fr)) != SuspFr_local_reg(resume_fr))
OPTYAP_ERROR_MESSAGE("DepFr_cons_cp(SuspFr_top_dep_fr) != SuspFr_local_reg (resume_suspension_frame)");
if ((void *)LOCAL_top_cp < SuspFr_local_reg(resume_fr) + SuspFr_local_size(resume_fr))
OPTYAP_ERROR_MESSAGE("LOCAL_top_cp < SuspFr_local_reg + SuspFr_local_size (resume_suspension_frame)");
#endif /* OPTYAP_ERRORS */
/* update shared nodes */
or_frame = top_or_fr;
while (or_frame != LOCAL_top_or_fr) {
LOCK_OR_FRAME(or_frame);
OrFr_owners(or_frame)++;
UNLOCK_OR_FRAME(or_frame);
or_frame = OrFr_next_on_stack(or_frame);
}
or_frame = top_or_fr;
while (or_frame != LOCAL_top_or_fr) {
LOCK_OR_FRAME(or_frame);
BITMAP_insert(OrFr_members(or_frame), worker_id);
BRANCH(worker_id, OrFr_depth(or_frame)) = 1;
UNLOCK_OR_FRAME(or_frame);
or_frame = OrFr_next(or_frame);
}
/* adjust top pointers */
LOCAL_top_or_fr = top_or_fr;
LOCAL_top_cp = OrFr_node(top_or_fr);
LOCAL_top_sg_fr = SuspFr_top_sg_fr(resume_fr);
LOCAL_top_dep_fr = SuspFr_top_dep_fr(resume_fr);
LOCAL_top_cp_on_stack = OrFr_node(SuspFr_top_or_fr_on_stack(resume_fr));
sg_frame = LOCAL_top_sg_fr;
while (sg_frame && YOUNGER_CP(SgFr_gen_cp(sg_frame), LOCAL_top_cp_on_stack)) {
SgFr_gen_worker(sg_frame) = worker_id;
sg_frame = SgFr_next(sg_frame);
}
/* adjust freeze registers */
adjust_freeze_registers();
/* free suspension frame */
FREE_SUSPENSION_FRAME(resume_fr);
return;
}
/* ------------------------- **
** Local functions **
** ------------------------- */
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) {
or_fr_ptr aux_or_fr;
sg_fr_ptr aux_sg_fr;
dep_fr_ptr aux_dep_fr;
/* complete all subgoals */
aux_dep_fr = SuspFr_top_dep_fr(susp_fr);
aux_sg_fr = SuspFr_top_sg_fr(susp_fr);
if (DepFr_leader_dep_is_on_stack(aux_dep_fr)) {
while (aux_sg_fr &&
SgFr_state(aux_sg_fr) == evaluating &&
EQUAL_OR_YOUNGER_CP(SgFr_gen_cp(aux_sg_fr), top_cp)) {
mark_as_completed(aux_sg_fr);
aux_sg_fr = SgFr_next(aux_sg_fr);
}
} else {
while (aux_sg_fr &&
SgFr_state(aux_sg_fr) == evaluating &&
YOUNGER_CP(SgFr_gen_cp(aux_sg_fr), top_cp)) {
mark_as_completed(aux_sg_fr);
aux_sg_fr = SgFr_next(aux_sg_fr);
}
}
/* chain dependency frames to release (using DepFr_next) */
while (IS_UNLOCKED(DepFr_lock(aux_dep_fr)) &&
YOUNGER_CP(DepFr_cons_cp(aux_dep_fr), top_cp)) {
dep_fr_ptr next_dep_fr;
LOCK(DepFr_lock(aux_dep_fr));
next_dep_fr = DepFr_next(aux_dep_fr);
DepFr_next(aux_dep_fr) = *chain_dep_fr;
*chain_dep_fr = aux_dep_fr;
aux_dep_fr = next_dep_fr;
}
/* chain or-frames to release (using OrFr_next_on_stack) **
** we use the OrFr_next_on_stack field instead of OrFr_next **
** to avoid conflicts with the 'find_dependency_node' macro */
aux_or_fr = SuspFr_top_or_fr_on_stack(susp_fr);
while (IS_UNLOCKED(OrFr_lock(aux_or_fr))) {
susp_fr_ptr aux_susp_fr;
or_fr_ptr next_or_fr_on_stack;
#ifdef OPTYAP_ERRORS
if (YOUNGER_CP(top_cp, OrFr_node(aux_or_fr)))
OPTYAP_ERROR_MESSAGE("YOUNGER_CP(top_cp, OrFr_node(aux_or_fr)) (complete_suspension_branch)");
#endif /* OPTYAP_ERRORS */
LOCK_OR_FRAME(aux_or_fr);
aux_susp_fr = OrFr_suspensions(aux_or_fr);
while (aux_susp_fr) {
susp_fr_ptr next_susp_fr;
complete_suspension_branch(aux_susp_fr, OrFr_node(aux_or_fr), chain_or_fr, chain_dep_fr);
next_susp_fr = SuspFr_next(aux_susp_fr);
FREE_SUSPENSION_FRAME(aux_susp_fr);
aux_susp_fr = next_susp_fr;
}
next_or_fr_on_stack = OrFr_next_on_stack(aux_or_fr);
OrFr_next_on_stack(aux_or_fr) = *chain_or_fr;
*chain_or_fr = aux_or_fr;
aux_or_fr = next_or_fr_on_stack;
}
return;
}
#endif /* TABLING && YAPOR */
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