310 lines
9.1 KiB
C
310 lines
9.1 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(YAPOR) || defined(TABLING)
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#define OPT_MAVAR_STATIC
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#include "Yatom.h"
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#include "YapHeap.h"
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#include <unistd.h>
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#include <signal.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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#ifdef TABLING
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#include "tab.macros.h"
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#endif /* TABLING */
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#if defined(TABLING) || !defined(YAPOR_COW)
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#ifndef TABLING
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#include "opt.mavar.h"
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#endif /* !TABLING */
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#ifdef MULTI_ASSIGNMENT_VARIABLES
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ma_hash_entry Yap_ma_hash_table[MAVARS_HASH_SIZE];
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UInt Yap_timestamp; /* an unsigned int */
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ma_h_inner_struct *Yap_ma_h_top;
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#endif /* MULTI_ASSIGNMENT_VARIABLES */
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#endif /* TABLING || !YAPOR_COW */
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#ifdef YAPOR_COW
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#include "sys/wait.h"
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#endif /* YAPOR_COW */
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/************************************************
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** Global variables are defined here **
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************************************************/
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#if defined(YAPOR) && ! defined(THREADS)
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struct worker WORKER;
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#endif /* YAPOR && ! THREADS */
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/*********************
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** Macros **
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*********************/
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#ifdef SHM_MEMORY_ALLOC_SCHEME
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#define STRUCTS_PER_PAGE(STR_TYPE) ((Yap_page_size - STRUCT_SIZE(struct page_header)) / STRUCT_SIZE(STR_TYPE))
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#define INIT_PAGES(PG, STR_TYPE) \
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INIT_LOCK(Pg_lock(PG)); \
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Pg_pg_alloc(PG) = 0; \
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Pg_str_in_use(PG) = 0; \
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Pg_str_per_pg(PG) = STRUCTS_PER_PAGE(STR_TYPE); \
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Pg_free_pg(PG) = NULL
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#else
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#define INIT_PAGES(PG, STR_TYPE) Pg_str_in_use(PG) = 0
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#endif /* SHM_MEMORY_ALLOC_SCHEME */
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/*******************************
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** Global functions **
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*******************************/
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void Yap_init_optyap_global(int max_table_size, int n_workers, int sch_loop, int delay_load) {
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int i;
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/* global data related to memory management */
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#ifdef LIMIT_TABLING
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if (max_table_size)
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Yap_max_pages = ((max_table_size - 1) * 1024 * 1024 / SHMMAX + 1) * SHMMAX / Yap_page_size;
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else
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Yap_max_pages = -1;
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#endif /* LIMIT_TABLING */
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INIT_PAGES(Yap_pages_void, void *);
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#ifdef YAPOR
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INIT_PAGES(Yap_pages_or_fr , struct or_frame);
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INIT_PAGES(Yap_pages_qg_sol_fr , struct query_goal_solution_frame);
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INIT_PAGES(Yap_pages_qg_ans_fr, struct query_goal_answer_frame);
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#endif /* YAPOR */
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#ifdef TABLING_INNER_CUTS
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INIT_PAGES(Yap_pages_tg_sol_fr, struct table_subgoal_solution_frame);
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INIT_PAGES(Yap_pages_tg_ans_fr, struct table_subgoal_answer_frame);
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#endif /* TABLING_INNER_CUTS */
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#ifdef TABLING
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INIT_PAGES(Yap_pages_tab_ent, struct table_entry);
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INIT_PAGES(Yap_pages_sg_fr, struct subgoal_frame);
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INIT_PAGES(Yap_pages_dep_fr, struct dependency_frame);
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INIT_PAGES(Yap_pages_sg_node, struct subgoal_trie_node);
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INIT_PAGES(Yap_pages_ans_node, struct answer_trie_node);
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INIT_PAGES(Yap_pages_gt_node, struct global_trie_node);
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INIT_PAGES(Yap_pages_sg_hash, struct subgoal_trie_hash);
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INIT_PAGES(Yap_pages_ans_hash, struct answer_trie_hash);
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INIT_PAGES(Yap_pages_gt_hash, struct global_trie_hash);
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#endif /* TABLING */
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#if defined(YAPOR) && defined(TABLING)
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INIT_PAGES(Yap_pages_susp_fr, struct suspension_frame);
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#endif /* YAPOR && TABLING */
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#ifdef YAPOR
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/* global static data */
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Yap_number_workers= n_workers;
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Yap_worker_pid(0) = getpid();
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for (i = 1; i < Yap_number_workers; i++) Yap_worker_pid(i) = 0;
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Yap_scheduler_loop = sch_loop;
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Yap_delayed_release_load = delay_load;
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/* global data related to or-performance */
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Yap_number_goals = 0;
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Yap_best_times(0) = 0;
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Yap_performance_mode = PERFORMANCE_OFF;
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/* global data related to or-parallelism */
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BITMAP_clear(Yap_bm_present_workers);
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for (i = 0; i < Yap_number_workers; i++)
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BITMAP_insert(Yap_bm_present_workers, i);
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BITMAP_copy(Yap_bm_idle_workers, Yap_bm_present_workers);
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BITMAP_clear(Yap_bm_root_cp_workers);
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BITMAP_clear(Yap_bm_invisible_workers);
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BITMAP_clear(Yap_bm_requestable_workers);
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BITMAP_clear(Yap_bm_executing_workers);
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BITMAP_copy(Yap_bm_finished_workers, Yap_bm_present_workers);
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INIT_LOCK(Yap_locks_bm_idle_workers);
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INIT_LOCK(Yap_locks_bm_root_cp_workers);
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INIT_LOCK(Yap_locks_bm_invisible_workers);
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INIT_LOCK(Yap_locks_bm_requestable_workers);
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INIT_LOCK(Yap_locks_bm_executing_workers);
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INIT_LOCK(Yap_locks_bm_finished_workers);
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#ifdef TABLING_INNER_CUTS
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INIT_LOCK(Yap_locks_bm_pruning_workers);
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#endif /* TABLING_INNER_CUTS */
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Yap_locks_who_locked_heap = MAX_WORKERS;
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INIT_LOCK(Yap_locks_heap_access);
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INIT_LOCK(Yap_locks_alloc_block);
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if (Yap_number_workers== 1)
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Yap_parallel_execution_mode = FALSE;
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else
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Yap_parallel_execution_mode = TRUE;
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#endif /* YAPOR */
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#ifdef TABLING
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/* global data related to tabling */
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new_global_trie_node(Yap_root_gt, 0, NULL, NULL, NULL);
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Yap_root_tab_ent = NULL;
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#ifdef LIMIT_TABLING
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Yap_first_sg_fr = NULL;
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Yap_last_sg_fr = NULL;
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Yap_check_sg_fr = NULL;
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#endif /* LIMIT_TABLING */
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Yap_root_dep_fr = NULL;
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for (i = 0; i < MAX_TABLE_VARS; i++) {
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CELL *pt = Yap_table_var_enumerator_addr(i);
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RESET_VARIABLE(pt);
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}
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#ifdef TABLE_LOCK_AT_WRITE_LEVEL
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for (i = 0; i < TABLE_LOCK_BUCKETS; i++)
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INIT_LOCK(Yap_table_lock(i));
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#endif /* TABLE_LOCK_AT_WRITE_LEVEL */
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#endif /* TABLING */
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return;
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}
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void Yap_init_local(void) {
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#ifdef YAPOR
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CACHE_REGS
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/* local data related to or-parallelism */
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LOCAL = REMOTE + worker_id;
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Set_LOCAL_top_cp((choiceptr) Yap_LocalBase);
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LOCAL_top_or_fr = Yap_root_or_fr;
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LOCAL_load = 0;
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LOCAL_share_request = MAX_WORKERS;
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LOCAL_reply_signal = worker_ready;
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#ifdef YAPOR_COPY
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INIT_LOCK(LOCAL_lock_signals);
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#endif /* YAPOR_COPY */
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Set_LOCAL_prune_request(NULL);
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#endif /* YAPOR */
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INIT_LOCK(LOCAL_lock);
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#ifdef TABLING
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/* local data related to tabling */
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LOCAL_next_free_ans_node = NULL;
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LOCAL_top_sg_fr = NULL;
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LOCAL_top_dep_fr = Yap_root_dep_fr;
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#ifdef YAPOR
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Set_LOCAL_top_cp_on_stack((choiceptr) Yap_LocalBase); /* ??? */
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LOCAL_top_susp_or_fr = Yap_root_or_fr;
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#endif /* YAPOR */
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#endif /* TABLING */
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return;
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}
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void make_root_frames(void) {
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#ifdef YAPOR
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CACHE_REGS
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/* root or frame */
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or_fr_ptr or_fr;
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ALLOC_OR_FRAME(or_fr);
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INIT_LOCK(OrFr_lock(or_fr));
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OrFr_alternative(or_fr) = NULL;
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BITMAP_copy(OrFr_members(or_fr), Yap_bm_present_workers);
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SetOrFr_node(or_fr, (choiceptr) Yap_LocalBase);
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OrFr_nearest_livenode(or_fr) = NULL;
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OrFr_depth(or_fr) = 0;
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Set_OrFr_pend_prune_cp(or_fr, NULL);
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OrFr_nearest_leftnode(or_fr) = or_fr;
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OrFr_qg_solutions(or_fr) = NULL;
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#ifdef TABLING_INNER_CUTS
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OrFr_tg_solutions(or_fr) = NULL;
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#endif /* TABLING_INNER_CUTS */
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#ifdef TABLING
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OrFr_owners(or_fr) = Yap_number_workers;
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OrFr_next_on_stack(or_fr) = NULL;
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OrFr_suspensions(or_fr) = NULL;
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OrFr_nearest_suspnode(or_fr) = or_fr;
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#endif /* TABLING */
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OrFr_next(or_fr) = NULL;
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Yap_root_or_fr = or_fr;
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#endif /* YAPOR */
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#ifdef TABLING
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/* root dependency frame */
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if (!Yap_root_dep_fr) {
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new_dependency_frame(Yap_root_dep_fr, FALSE, NULL, NULL, NULL, NULL, NULL);
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#ifdef TABLING
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DepFr_cons_cp(Yap_root_dep_fr) = B;
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#endif /* TABLING */
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}
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#endif /* TABLING */
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}
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#ifdef YAPOR
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void init_workers(void) {
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CACHE_REGS
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int proc;
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#ifdef THREADS
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return;
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#endif
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#ifdef YAPOR_COW
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if (Yap_number_workers> 1) {
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int son;
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son = fork();
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if (son == -1)
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Yap_Error(FATAL_ERROR, TermNil, "fork error (init_workers)");
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if (son > 0) {
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/* I am the father, I must stay here and wait for my children to all die */
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struct sigaction sigact;
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Yap_master_worker = getpid();
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sigact.sa_handler = SIG_DFL;
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = SA_RESTART;
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sigaction(SIGINT, &sigact, NULL);
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pause();
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exit(0);
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} else Yap_worker_pid(0) = getpid();
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}
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#endif /* YAPOR_COW */
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for (proc = 1; proc < Yap_number_workers; proc++) {
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int son;
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son = fork();
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if (son == -1)
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Yap_Error(FATAL_ERROR, TermNil, "fork error (init_workers)");
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if (son == 0) {
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/* new worker */
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worker_id = proc;
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remap_memory();
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break;
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}
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else Yap_worker_pid(proc) = son;
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}
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}
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#endif /* YAPOR */
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void itos(int i, char *s) {
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int n,r,j;
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n = 10;
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while (n <= i) n *= 10;
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j = 0;
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while (n > 1) {
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n = n / 10;
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r = i / n;
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i = i - r * n;
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s[j++] = r + '0';
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}
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s[j] = 0;
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return;
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}
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#endif /* YAPOR || TABLING */
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