234 lines
7.0 KiB
C
234 lines
7.0 KiB
C
/************************************************************************
|
|
** **
|
|
** 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 **
|
|
** **
|
|
************************************************************************/
|
|
|
|
/* ------------------ **
|
|
** Includes **
|
|
** ------------------ */
|
|
|
|
#include "Yap.h"
|
|
#ifdef ACOW
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include "Yatom.h"
|
|
#include "YapHeap.h"
|
|
#include "or.macros.h"
|
|
|
|
|
|
|
|
|
|
/* ------------------------------------- **
|
|
** Local functions declaration **
|
|
** ------------------------------------- */
|
|
|
|
static void share_private_nodes(int worker_q);
|
|
|
|
|
|
|
|
/* ----------------------- **
|
|
** Local inlines **
|
|
** ----------------------- */
|
|
|
|
STD_PROTO(static inline void PUT_BUSY, (int));
|
|
|
|
static inline
|
|
void PUT_BUSY(int worker_num) {
|
|
LOCK(GLOBAL_LOCKS_bm_idle_workers);
|
|
BITMAP_delete(GLOBAL_bm_idle_workers, worker_num);
|
|
UNLOCK(GLOBAL_LOCKS_bm_idle_workers);
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
/* -------------------------- **
|
|
** Global functions **
|
|
** -------------------------- */
|
|
|
|
void make_root_choice_point(void) {
|
|
if (worker_id == 0) {
|
|
LOCAL_top_cp = GLOBAL_root_cp = OrFr_node(GLOBAL_root_or_fr) = B;
|
|
} else {
|
|
B = LOCAL_top_cp = GLOBAL_root_cp;
|
|
B->cp_tr = TR = ((choiceptr) (worker_offset(0) + (CELL)(B)))->cp_tr;
|
|
}
|
|
B->cp_h = H0;
|
|
B->cp_ap = GETWORK;
|
|
B->cp_or_fr = GLOBAL_root_or_fr;
|
|
LOCAL_top_or_fr = GLOBAL_root_or_fr;
|
|
LOCAL_load = 0;
|
|
LOCAL_prune_request = NULL;
|
|
BRANCH(worker_id, 0) = 0;
|
|
return;
|
|
}
|
|
|
|
|
|
void free_root_choice_point(void) {
|
|
B = LOCAL_top_cp->cp_b;
|
|
LOCAL_top_cp = (choiceptr) Yap_LocalBase;
|
|
return;
|
|
}
|
|
|
|
|
|
int p_share_work(void) {
|
|
int worker_q = LOCAL_share_request;
|
|
int son;
|
|
|
|
if (! BITMAP_member(OrFr_members(REMOTE_top_or_fr(worker_q)), worker_id) ||
|
|
B == REMOTE_top_cp(worker_q) ||
|
|
(LOCAL_load <= DELAYED_RELEASE_LOAD && OrFr_nearest_livenode(LOCAL_top_or_fr) == NULL)) {
|
|
/* refuse sharing request */
|
|
REMOTE_reply_signal(LOCAL_share_request) = no_sharing;
|
|
LOCAL_share_request = MAX_WORKERS;
|
|
PUT_OUT_REQUESTABLE(worker_id);
|
|
return TRUE;
|
|
}
|
|
/* sharing request accepted */
|
|
REMOTE_reply_signal(worker_q) = sharing;
|
|
share_private_nodes(worker_q);
|
|
if ((son = fork()) == 0) {
|
|
worker_id = worker_q; /* child becomes requesting worker */
|
|
LOCAL = REMOTE + worker_id;
|
|
LOCAL_reply_signal = ready;
|
|
PUT_IN_REQUESTABLE(worker_id);
|
|
PUT_BUSY(worker_id);
|
|
|
|
return FALSE;
|
|
} else {
|
|
worker_pid(worker_q) = son;
|
|
LOCAL_share_request = MAX_WORKERS;
|
|
PUT_IN_REQUESTABLE(worker_id);
|
|
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
|
|
int q_share_work(int worker_p) {
|
|
LOCK_OR_FRAME(LOCAL_top_or_fr);
|
|
if (Get_REMOTE_prune_request(worker_p)) {
|
|
/* worker p with prune request */
|
|
UNLOCK_OR_FRAME(LOCAL_top_or_fr);
|
|
return FALSE;
|
|
}
|
|
YAPOR_ERROR_CHECKING(q_share_work, 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));
|
|
/* there is no pending prune with worker p at right --> safe move to worker p branch */
|
|
BRANCH(worker_id, OrFr_depth(LOCAL_top_or_fr)) = BRANCH(worker_p, OrFr_depth(LOCAL_top_or_fr));
|
|
LOCAL_prune_request = NULL;
|
|
UNLOCK_OR_FRAME(LOCAL_top_or_fr);
|
|
|
|
/* make sharing request */
|
|
LOCK_WORKER(worker_p);
|
|
if (BITMAP_member(GLOBAL_bm_idle_workers, worker_p) ||
|
|
REMOTE_share_request(worker_p) != MAX_WORKERS) {
|
|
/* worker p is idle or has another request */
|
|
UNLOCK_WORKER(worker_p);
|
|
return FALSE;
|
|
}
|
|
REMOTE_share_request(worker_p) = worker_id;
|
|
UNLOCK_WORKER(worker_p);
|
|
|
|
/* wait for an answer */
|
|
while (LOCAL_reply_signal == ready);
|
|
if (LOCAL_reply_signal == no_sharing) {
|
|
/* sharing request refused */
|
|
LOCAL_reply_signal = ready;
|
|
return FALSE;
|
|
}
|
|
/* exit this process */
|
|
exit(0);
|
|
}
|
|
|
|
|
|
|
|
/* ------------------------- **
|
|
** Local functions **
|
|
** ------------------------- */
|
|
|
|
static
|
|
void share_private_nodes(int worker_q) {
|
|
int depth;
|
|
choiceptr AuxB;
|
|
or_fr_ptr or_frame, previous_or_frame;
|
|
|
|
/* initialize auxiliary variables */
|
|
AuxB = B;
|
|
previous_or_frame = NULL;
|
|
depth = OrFr_depth(LOCAL_top_or_fr);
|
|
/* sharing loop */
|
|
while (AuxB != LOCAL_top_cp) {
|
|
depth++;
|
|
ALLOC_OR_FRAME(or_frame);
|
|
INIT_LOCK(OrFr_lock(or_frame));
|
|
SetOrFr_node(or_frame, AuxB);
|
|
OrFr_alternative(or_frame) = AuxB->cp_ap;
|
|
OrFr_pend_prune_cp(or_frame) = NULL;
|
|
OrFr_nearest_leftnode(or_frame) = LOCAL_top_or_fr;
|
|
OrFr_qg_solutions(or_frame) = NULL;
|
|
BITMAP_clear(OrFr_members(or_frame));
|
|
BITMAP_insert(OrFr_members(or_frame), worker_id);
|
|
BITMAP_insert(OrFr_members(or_frame), worker_q);
|
|
if (AuxB->cp_ap && YAMOP_SEQ(AuxB->cp_ap)) {
|
|
AuxB->cp_ap = GETWORK_SEQ;
|
|
} else {
|
|
AuxB->cp_ap = GETWORK;
|
|
}
|
|
AuxB->cp_or_fr = or_frame;
|
|
AuxB = AuxB->cp_b;
|
|
if (previous_or_frame) {
|
|
OrFr_nearest_livenode(previous_or_frame) = OrFr_next(previous_or_frame) = or_frame;
|
|
}
|
|
previous_or_frame = or_frame;
|
|
}
|
|
/* initialize last or-frame pointer */
|
|
or_frame = AuxB->cp_or_fr;
|
|
if (previous_or_frame) {
|
|
OrFr_nearest_livenode(previous_or_frame) = OrFr_next(previous_or_frame) = or_frame;
|
|
}
|
|
/* update depth */
|
|
if (depth >= MAX_BRANCH_DEPTH)
|
|
Yap_Error(INTERNAL_ERROR, TermNil, "maximum depth exceded (share_private_nodes)");
|
|
or_frame = B->cp_or_fr;
|
|
while (or_frame != LOCAL_top_or_fr) {
|
|
unsigned int branch;
|
|
if (OrFr_alternative(or_frame)) {
|
|
branch = YAMOP_OR_ARG(OrFr_alternative(or_frame)) + 1;
|
|
} else {
|
|
branch = 1;
|
|
}
|
|
branch |= YAMOP_CUT_FLAG; /* in doubt, assume cut */
|
|
BRANCH(worker_id, depth) = BRANCH(worker_q, depth) = branch;
|
|
OrFr_depth(or_frame) = depth--;
|
|
or_frame = OrFr_next_on_stack(or_frame);
|
|
}
|
|
/* 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));
|
|
BITMAP_insert(OrFr_members(or_frame), worker_q);
|
|
UNLOCK_OR_FRAME(or_frame);
|
|
or_frame = OrFr_next_on_stack(or_frame);
|
|
}
|
|
/* update top shared nodes */
|
|
REMOTE_top_cp(worker_q) = LOCAL_top_cp = B;
|
|
REMOTE_top_or_fr(worker_q) = LOCAL_top_or_fr = LOCAL_top_cp->cp_or_fr;
|
|
/* update prune request */
|
|
if (LOCAL_prune_request) {
|
|
CUT_send_prune_request(worker_q, LOCAL_prune_request);
|
|
}
|
|
/* update load and return */
|
|
REMOTE_load(worker_q) = LOCAL_load = 0;
|
|
return;
|
|
}
|
|
#endif /* ACOW */
|