(macro GLOBAL_TRIE was removed). Use 'yap_flag(tabling_mode,MODE)' to
set the storing mode for all tabled predicates to MODE ('local_trie' or
'global_trie). Alternatively, use 'tabling_mode(PRED,MODE)' to set the
default tabling mode of predicate PRED to MODE ('local_trie' or
'global_trie'). The default mode for all tabled predicates is 'local_trie'.
		
	
		
			
				
	
	
		
			485 lines
		
	
	
		
			37 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			485 lines
		
	
	
		
			37 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
| /************************************************************************
 | |
| **                                                                     **
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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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| /************************************************************************
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| **                          Memory management                          **
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| ************************************************************************/
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| 
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| extern int Yap_page_size;
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| 
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| #ifdef SHM_MEMORY_ALLOC_SCHEME
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| #include <sys/shm.h>
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| #define SHMMAX 0x2000000  /* 32 Mbytes: works fine with linux */
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| /* #define SHMMAX  0x400000 - 4 Mbytes: shmget limit for Mac (?) */
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| /* #define SHMMAX  0x800000 - 8 Mbytes: shmget limit for Solaris (?) */
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| #endif /* SHM_MEMORY_ALLOC_SCHEME */
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| 
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| #if SIZEOF_INT_P == 4
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| #define ALIGN	                   3
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| #define ALIGNMASK                  0xfffffffc
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| #elif SIZEOF_INT_P == 8
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| #define ALIGN	                   7
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| #define ALIGNMASK                  0xfffffff8
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| #else
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| #define ALIGN	                   OOOOPPS!!! Unknown Pointer Sizeof
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| #define ALIGNMASK                  OOOOPPS!!! Unknown Pointer Sizeof
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| #endif /* SIZEOF_INT_P */
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| 
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| #define ADJUST_SIZE(SIZE)          ((SIZE + ALIGN) & ALIGNMASK)
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| #define ADJUST_SIZE_TO_PAGE(SIZE)  ((SIZE) - (SIZE) % Yap_page_size + Yap_page_size)
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| #define STRUCT_SIZE(STR_TYPE)      ADJUST_SIZE(sizeof(STR_TYPE))
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| #define PAGE_HEADER(STR)           (pg_hd_ptr)((unsigned long int)STR - (unsigned long int)STR % Yap_page_size)
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| #define STRUCT_NEXT(STR)           ((STR)->next)
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| 
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| #define UPDATE_STATS(STAT, VALUE)  STAT += VALUE
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| 
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| 
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| #ifdef MALLOC_MEMORY_ALLOC_SCHEME
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| /*************************************************************************************************
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| **                                  MALLOC_MEMORY_ALLOC_SCHEME                                  **
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| *************************************************************************************************/
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| #define ALLOC_BLOCK(STR, SIZE, STR_TYPE)                                                         \
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|         if ((STR = (STR_TYPE *) malloc(SIZE)) == NULL)                                           \
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|           Yap_Error(FATAL_ERROR, TermNil, "ALLOC_BLOCK: malloc error")
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| #define FREE_BLOCK(STR)                                                                          \
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|         free(STR)
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| #else
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| /*************************************************************************************************
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| **                                 ! MALLOC_MEMORY_ALLOC_SCHEME                                 **
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| *************************************************************************************************/
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| #define ALLOC_BLOCK(STR, SIZE, STR_TYPE)                                                         \
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|         { char *block_ptr;                                                                       \
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|           if ((block_ptr = Yap_AllocCodeSpace(SIZE + sizeof(CELL))) != NULL)                     \
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|             *block_ptr = 'y';                                                                    \
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|           else if ((block_ptr = (char *) malloc(SIZE + sizeof(CELL))) != NULL)                   \
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|             *block_ptr = 'm';                                                                    \
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|           else                                                                                   \
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|             Yap_Error(FATAL_ERROR, TermNil, "ALLOC_BLOCK: malloc error");                        \
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|           block_ptr += sizeof(CELL);                                                             \
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|           STR = (STR_TYPE *) block_ptr;                                                          \
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|         }
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| #define FREE_BLOCK(STR)                                                                          \
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|         { char *block_ptr = (char *)(STR) - sizeof(CELL);                                        \
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|           if (block_ptr[0] == 'y')                                                               \
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|             Yap_FreeCodeSpace(block_ptr);                                                        \
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|           else                                                                                   \
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|             free(block_ptr);                                                                     \
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|         }
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| #endif /*****************************************************************************************/
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| 
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| 
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| #if defined(MALLOC_MEMORY_ALLOC_SCHEME) || defined(YAP_MEMORY_ALLOC_SCHEME)
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| /*************************************************************************************************
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| **                    MALLOC_MEMORY_ALLOC_SCHEME || YAP_MEMORY_ALLOC_SCHEME                     **
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| *************************************************************************************************/
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| #define ALLOC_STRUCT(STR, STR_PAGES, STR_TYPE)                                                   \
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|         UPDATE_STATS(Pg_str_in_use(STR_PAGES), 1);                                               \
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|         ALLOC_BLOCK(STR, sizeof(STR_TYPE), STR_TYPE)
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| #define ALLOC_NEXT_FREE_STRUCT(STR, STR_PAGES, STR_TYPE)                                         \
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|         ALLOC_STRUCT(STR, STR_PAGES, STR_TYPE)
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| #define FREE_STRUCT(STR, STR_PAGES, STR_TYPE)                                                    \
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|         UPDATE_STATS(Pg_str_in_use(STR_PAGES), -1);                                              \
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|         FREE_BLOCK(STR)
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| #elif SHM_MEMORY_ALLOC_SCHEME
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| #ifdef LIMIT_TABLING
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| /*************************************************************************************************
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| **                          SHM_MEMORY_ALLOC_SCHEME && LIMIT_TABLING                            **
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| *************************************************************************************************/
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| #define INIT_PAGE(PG_HD, STR_PAGES, STR_TYPE)                                                    \
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|         { int i;                                                                                 \
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|           STR_TYPE *aux_str;                                                                     \
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|           PgHd_str_in_use(PG_HD) = 0;                                                            \
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|           PgHd_previous(PG_HD) = NULL;                                                           \
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|           aux_str = (STR_TYPE *) (PG_HD + 1);                                                    \
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|           PgHd_free_str(PG_HD) = (void *) aux_str;                                               \
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|           for (i = 1; i < Pg_str_per_pg(STR_PAGES); i++) {                                       \
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|             STRUCT_NEXT(aux_str) = aux_str + 1;                                                  \
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|             aux_str++;                                                                           \
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|           }                                                                                      \
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|           STRUCT_NEXT(aux_str) = NULL;                                                           \
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|           LOCK(Pg_lock(STR_PAGES));                                                              \
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|           if ((PgHd_next(PG_HD) = Pg_free_pg(STR_PAGES)) != NULL)                                \
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|             PgHd_previous(PgHd_next(PG_HD)) = PG_HD;                                             \
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|           Pg_free_pg(STR_PAGES) = PG_HD;                                                         \
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|           UPDATE_STATS(Pg_pg_alloc(STR_PAGES), 1);                                               \
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|         }
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| 
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| #define ALLOC_PAGE(PG_HD)                                                                        \
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|         { int i, shmid;                                                                          \
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|           pg_hd_ptr aux_pg_hd;                                                                   \
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|           if ((shmid = shmget(IPC_PRIVATE, SHMMAX, SHM_R|SHM_W)) == -1)                          \
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|             Yap_Error(FATAL_ERROR, TermNil, "shmget error (ALLOC_PAGE)");                        \
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|           if ((PG_HD = (pg_hd_ptr) shmat(shmid, NULL, 0)) == (void *) -1)                        \
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|             Yap_Error(FATAL_ERROR, TermNil, "shmat error (ALLOC_PAGE)");                         \
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|           if (shmctl(shmid, IPC_RMID, 0) != 0)                                                   \
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|             Yap_Error(FATAL_ERROR, TermNil, "shmctl error (ALLOC_PAGE)");                        \
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|           aux_pg_hd = (pg_hd_ptr)(((void *)PG_HD) + Yap_page_size);                              \
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|           Pg_free_pg(GLOBAL_PAGES_void) = aux_pg_hd;                                             \
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|           for (i = 2; i < SHMMAX / Yap_page_size; i++) {                                         \
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|             PgHd_next(aux_pg_hd) = (pg_hd_ptr)(((void *)aux_pg_hd) + Yap_page_size);             \
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|             aux_pg_hd = PgHd_next(aux_pg_hd);                                                    \
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|           }                                                                                      \
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|           PgHd_next(aux_pg_hd) = NULL;                                                           \
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|           UPDATE_STATS(Pg_pg_alloc(GLOBAL_PAGES_void), SHMMAX / Yap_page_size);                  \
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|         }
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| 
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| #define RECOVER_UNUSED_SPACE(STR_PAGES)                                                          \
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|         { sg_fr_ptr sg_fr = GLOBAL_check_sg_fr;                                                  \
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|           do {                                                                                   \
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|             if (sg_fr)                                                                           \
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|               sg_fr = SgFr_next(sg_fr);                                                          \
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|             else                                                                                 \
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|               sg_fr = GLOBAL_first_sg_fr;                                                        \
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|             if (sg_fr == NULL)                                                                   \
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|               Yap_Error(FATAL_ERROR, TermNil, "no space left (RECOVER_UNUSED_SPACE)");           \
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|               /* see function 'InteractSIGINT' in file 'sysbits.c' */                            \
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|               /* Yap_Error(PURE_ABORT, TermNil, "");               */                            \
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|               /* restore_absmi_regs(&Yap_standard_regs);           */                            \
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|               /* siglongjmp (Yap_RestartEnv, 1);                   */                            \
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|             if (SgFr_first_answer(sg_fr) &&                                                      \
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|                 SgFr_first_answer(sg_fr) != SgFr_answer_trie(sg_fr)) {                           \
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|               SgFr_state(sg_fr) = ready;                                                         \
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| 	      free_answer_hash_chain(SgFr_hash_chain(sg_fr));                                    \
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| 	      SgFr_hash_chain(sg_fr) = NULL;                                                     \
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| 	      SgFr_first_answer(sg_fr) = NULL;                                                   \
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|               SgFr_last_answer(sg_fr) = NULL;                                                    \
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|               free_answer_trie(TrNode_child(SgFr_answer_trie(sg_fr)),                            \
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|                                TRAVERSE_MODE_NORMAL, TRAVERSE_POSITION_FIRST);                   \
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|               TrNode_child(SgFr_answer_trie(sg_fr)) = NULL;                                      \
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| 	    }                                                                                    \
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|           } while (Pg_free_pg(GLOBAL_PAGES_void) == Pg_free_pg(STR_PAGES));                      \
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|           GLOBAL_check_sg_fr = sg_fr;                                                            \
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|         }
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| 
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| #define ALLOC_STRUCT(STR, STR_PAGES, STR_TYPE)                                                   \
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|         { pg_hd_ptr pg_hd;                                                                       \
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|           LOCK(Pg_lock(STR_PAGES));                                                              \
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|           pg_hd = Pg_free_pg(STR_PAGES);                                                         \
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|           while (pg_hd == NULL) {                                                                \
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|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
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|             LOCK(Pg_lock(GLOBAL_PAGES_void));                                                    \
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|             if (Pg_free_pg(GLOBAL_PAGES_void)) {                                                 \
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|               pg_hd = Pg_free_pg(GLOBAL_PAGES_void);                                             \
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|               Pg_free_pg(GLOBAL_PAGES_void) = PgHd_next(pg_hd);                                  \
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|               UPDATE_STATS(Pg_str_in_use(GLOBAL_PAGES_void), 1);                                 \
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|               UNLOCK(Pg_lock(GLOBAL_PAGES_void));                                                \
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|               INIT_PAGE(pg_hd, STR_PAGES, STR_TYPE);                                             \
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|             } else if (GLOBAL_MAX_PAGES != Pg_pg_alloc(GLOBAL_PAGES_void)) {                     \
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|               ALLOC_PAGE(pg_hd);                                                                 \
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|               UPDATE_STATS(Pg_str_in_use(GLOBAL_PAGES_void), 1);                                 \
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|               UNLOCK(Pg_lock(GLOBAL_PAGES_void));                                                \
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|               INIT_PAGE(pg_hd, STR_PAGES, STR_TYPE);                                             \
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|             } else {                                                                             \
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|               UNLOCK(Pg_lock(GLOBAL_PAGES_void));                                                \
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|               RECOVER_UNUSED_SPACE(STR_PAGES);                                                   \
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|               LOCK(Pg_lock(STR_PAGES));                                                          \
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|               pg_hd = Pg_free_pg(STR_PAGES);                                                     \
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|             }                                                                                    \
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|           }                                                                                      \
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|           PgHd_str_in_use(pg_hd)++;                                                              \
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|           STR = (STR_TYPE *) PgHd_free_str(pg_hd);                                               \
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|           if ((PgHd_free_str(pg_hd) = (void *) STRUCT_NEXT(STR)) == NULL)                        \
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|             if ((Pg_free_pg(STR_PAGES) = PgHd_next(pg_hd)) != NULL)                              \
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|               PgHd_previous(PgHd_next(pg_hd)) = NULL;                                            \
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|           UPDATE_STATS(Pg_str_in_use(STR_PAGES), 1);                                             \
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|           UNLOCK(Pg_lock(STR_PAGES));                                                            \
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| 	}
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| 
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| #define ALLOC_NEXT_FREE_STRUCT(STR, STR_PAGES, STR_TYPE)                                         \
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|         if ((STR = LOCAL_next_free_ans_node) == NULL) {                                          \
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|           pg_hd_ptr pg_hd;                                                                       \
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|           LOCK(Pg_lock(STR_PAGES));                                                              \
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|           pg_hd = Pg_free_pg(STR_PAGES);                                                         \
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|           while (pg_hd == NULL) {                                                                \
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|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
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|             LOCK(Pg_lock(GLOBAL_PAGES_void));                                                    \
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|             if (Pg_free_pg(GLOBAL_PAGES_void)) {                                                 \
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|               pg_hd = Pg_free_pg(GLOBAL_PAGES_void);                                             \
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|               Pg_free_pg(GLOBAL_PAGES_void) = PgHd_next(pg_hd);                                  \
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|               UPDATE_STATS(Pg_str_in_use(GLOBAL_PAGES_void), 1);                                 \
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|               UNLOCK(Pg_lock(GLOBAL_PAGES_void));                                                \
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|               INIT_PAGE(pg_hd, STR_PAGES, STR_TYPE);                                             \
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|             } else if (GLOBAL_MAX_PAGES != Pg_pg_alloc(GLOBAL_PAGES_void)) {                     \
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|               ALLOC_PAGE(pg_hd);                                                                 \
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|               UPDATE_STATS(Pg_str_in_use(GLOBAL_PAGES_void), 1);                                 \
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|               UNLOCK(Pg_lock(GLOBAL_PAGES_void));                                                \
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|               INIT_PAGE(pg_hd, STR_PAGES, STR_TYPE);                                             \
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|             } else {                                                                             \
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|               UNLOCK(Pg_lock(GLOBAL_PAGES_void));                                                \
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|               RECOVER_UNUSED_SPACE(STR_PAGES);                                                   \
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|               LOCK(Pg_lock(STR_PAGES));                                                          \
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|               pg_hd = Pg_free_pg(STR_PAGES);                                                     \
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|             }                                                                                    \
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|           }                                                                                      \
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|           PgHd_str_in_use(pg_hd) = Pg_str_per_pg(STR_PAGES);                                     \
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|           STR = (STR_TYPE *) PgHd_free_str(pg_hd);                                               \
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|           PgHd_free_str(pg_hd) = NULL;                                                           \
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|           Pg_free_pg(STR_PAGES) = PgHd_next(pg_hd);                                              \
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|           UPDATE_STATS(Pg_str_in_use(STR_PAGES), -PgHd_str_in_use(pg_hd));                       \
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|           UPDATE_STATS(Pg_str_in_use(STR_PAGES), Pg_str_per_pg(STR_PAGES));                      \
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|           UNLOCK(Pg_lock(STR_PAGES));                                                            \
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| 	}                                                                                        \
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|         LOCAL_next_free_ans_node = STRUCT_NEXT(STR)
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| #else
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| /*************************************************************************************************
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| **                          SHM_MEMORY_ALLOC_SCHEME && !LIMIT_TABLING                           **
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| *************************************************************************************************/
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| #define ALLOC_PAGE(PG_HD)                                                                        \
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|         LOCK(Pg_lock(GLOBAL_PAGES_void));                                                        \
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|         if (Pg_free_pg(GLOBAL_PAGES_void) == NULL) {                                             \
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|           int i, shmid;                                                                          \
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|           pg_hd_ptr pg_hd, aux_pg_hd;                                                            \
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|           if ((shmid = shmget(IPC_PRIVATE, SHMMAX, SHM_R|SHM_W)) == -1)                          \
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|             Yap_Error(FATAL_ERROR, TermNil, "shmget error (ALLOC_PAGE)");                        \
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|           if ((pg_hd = (pg_hd_ptr) shmat(shmid, NULL, 0)) == (void *) -1)                        \
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|             Yap_Error(FATAL_ERROR, TermNil, "shmat error (ALLOC_PAGE)");                         \
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|           if (shmctl(shmid, IPC_RMID, 0) != 0)                                                   \
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|             Yap_Error(FATAL_ERROR, TermNil, "shmctl error (ALLOC_PAGE)");                        \
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|           Pg_free_pg(GLOBAL_PAGES_void) = pg_hd;                                                 \
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|           for (i = 1; i < SHMMAX / Yap_page_size; i++) {                                         \
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|             aux_pg_hd = (pg_hd_ptr)(((void *)pg_hd) + Yap_page_size);                            \
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|             PgHd_next(pg_hd) = aux_pg_hd;                                                        \
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|             pg_hd = aux_pg_hd;                                                                   \
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|           }                                                                                      \
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|           PgHd_next(pg_hd) = NULL;                                                               \
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|           UPDATE_STATS(Pg_pg_alloc(GLOBAL_PAGES_void), SHMMAX / Yap_page_size);                  \
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|         }                                                                                        \
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|         UPDATE_STATS(Pg_str_in_use(GLOBAL_PAGES_void), 1);                                       \
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|         PG_HD = Pg_free_pg(GLOBAL_PAGES_void);                                                   \
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|         Pg_free_pg(GLOBAL_PAGES_void) = PgHd_next(PG_HD);                                        \
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|         UNLOCK(Pg_lock(GLOBAL_PAGES_void))
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| 
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| #define ALLOC_STRUCT(STR, STR_PAGES, STR_TYPE)                                                   \
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|         { pg_hd_ptr pg_hd;                                                                       \
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|           LOCK(Pg_lock(STR_PAGES));                                                              \
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|           UPDATE_STATS(Pg_str_in_use(STR_PAGES), 1);                                             \
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|           if (Pg_free_pg(STR_PAGES)) {                                                           \
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|             pg_hd = Pg_free_pg(STR_PAGES);                                                       \
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|             PgHd_str_in_use(pg_hd)++;                                                            \
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|             STR = (STR_TYPE *) PgHd_free_str(pg_hd);                                             \
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|             if ((PgHd_free_str(pg_hd) = (void *) STRUCT_NEXT(STR)) == NULL)                      \
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|               if ((Pg_free_pg(STR_PAGES) = PgHd_next(pg_hd)) != NULL)                            \
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|                 PgHd_previous(PgHd_next(pg_hd)) = NULL;                                          \
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|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
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|           } else {                                                                               \
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|             int i;                                                                               \
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|             UPDATE_STATS(Pg_pg_alloc(STR_PAGES), 1);                                             \
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|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
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|             ALLOC_PAGE(pg_hd);                                                                   \
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|             PgHd_str_in_use(pg_hd) = 1;                                                          \
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|             PgHd_previous(pg_hd) = NULL;                                                         \
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|             STR = (STR_TYPE *) (pg_hd + 1);                                                      \
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|             PgHd_free_str(pg_hd) = (void *) ++STR;                                               \
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|             for (i = Pg_str_per_pg(STR_PAGES); i != 2; i--) {                                    \
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|               STRUCT_NEXT(STR) = STR + 1;                                                        \
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|               STR++;                                                                             \
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|             }                                                                                    \
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|             STRUCT_NEXT(STR) = NULL;                                                             \
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|             STR = (STR_TYPE *) (pg_hd + 1);                                                      \
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|             LOCK(Pg_lock(STR_PAGES));                                                            \
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|             if ((PgHd_next(pg_hd) = Pg_free_pg(STR_PAGES)) != NULL)                              \
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|               PgHd_previous(PgHd_next(pg_hd)) = pg_hd;                                           \
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|             Pg_free_pg(STR_PAGES) = pg_hd;                                                       \
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|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
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|           }                                                                                      \
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| 	}
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| 
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| #define ALLOC_NEXT_FREE_STRUCT(STR, STR_PAGES, STR_TYPE)                                         \
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|         if ((STR = LOCAL_next_free_ans_node) == NULL) {                                          \
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|           pg_hd_ptr pg_hd;                                                                       \
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|           LOCK(Pg_lock(STR_PAGES));                                                              \
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|           UPDATE_STATS(Pg_str_in_use(STR_PAGES), Pg_str_per_pg(STR_PAGES));                      \
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|           if (Pg_free_pg(STR_PAGES)) {                                                           \
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|             pg_hd = Pg_free_pg(STR_PAGES);                                                       \
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|             UPDATE_STATS(Pg_str_in_use(STR_PAGES), -PgHd_str_in_use(pg_hd));                     \
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|             PgHd_str_in_use(pg_hd) = Pg_str_per_pg(STR_PAGES);                                   \
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|             STR = (STR_TYPE *) PgHd_free_str(pg_hd);                                             \
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|             PgHd_free_str(pg_hd) = NULL;                                                         \
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|             Pg_free_pg(STR_PAGES) = PgHd_next(pg_hd);                                            \
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|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
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|           } else {                                                                               \
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|             int i;                                                                               \
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|             UPDATE_STATS(Pg_pg_alloc(STR_PAGES), 1);                                             \
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|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
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|             ALLOC_PAGE(pg_hd);                                                                   \
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|             PgHd_str_in_use(pg_hd) = Pg_str_per_pg(STR_PAGES);                                   \
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|             PgHd_free_str(pg_hd) = NULL;                                                         \
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|             PgHd_previous(pg_hd) = NULL;                                                         \
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|             PgHd_next(pg_hd) = NULL;                                                             \
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|             STR = (STR_TYPE *) (pg_hd + 1);                                                      \
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|             for (i = Pg_str_per_pg(STR_PAGES); i != 1; i--) {                                    \
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|               STRUCT_NEXT(STR) = STR + 1;                                                        \
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|               STR++;                                                                             \
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|             }                                                                                    \
 | |
|             STRUCT_NEXT(STR) = NULL;                                                             \
 | |
|             STR = (STR_TYPE *) (pg_hd + 1);                                                      \
 | |
|           }                                                                                      \
 | |
| 	}                                                                                        \
 | |
|         LOCAL_next_free_ans_node = STRUCT_NEXT(STR)
 | |
| #endif /* LIMIT_TABLING */
 | |
| /*************************************************************************************************
 | |
| **                                   SHM_MEMORY_ALLOC_SCHEME                                    **
 | |
| *************************************************************************************************/
 | |
| #define FREE_PAGE(PG_HD)                                                                         \
 | |
|         LOCK(Pg_lock(GLOBAL_PAGES_void));                                                        \
 | |
|         UPDATE_STATS(Pg_str_in_use(GLOBAL_PAGES_void), -1);                                      \
 | |
|         PgHd_next(PG_HD) = Pg_free_pg(GLOBAL_PAGES_void);                                        \
 | |
|         Pg_free_pg(GLOBAL_PAGES_void) = PG_HD;                                                   \
 | |
|         UNLOCK(Pg_lock(GLOBAL_PAGES_void))
 | |
| 
 | |
| #define FREE_STRUCT(STR, STR_PAGES, STR_TYPE)                                                    \
 | |
|         { pg_hd_ptr pg_hd;                                                                       \
 | |
|           pg_hd = PAGE_HEADER(STR);                                                              \
 | |
|           LOCK(Pg_lock(STR_PAGES));                                                              \
 | |
|           UPDATE_STATS(Pg_str_in_use(STR_PAGES), -1);                                            \
 | |
|           if (--PgHd_str_in_use(pg_hd) == 0) {                                                   \
 | |
|             UPDATE_STATS(Pg_pg_alloc(STR_PAGES), -1);                                            \
 | |
|             if (PgHd_previous(pg_hd)) {                                                          \
 | |
|               if ((PgHd_next(PgHd_previous(pg_hd)) = PgHd_next(pg_hd)) != NULL)                  \
 | |
|                 PgHd_previous(PgHd_next(pg_hd)) = PgHd_previous(pg_hd);                          \
 | |
| 	    } else {                                                                             \
 | |
|               if ((Pg_free_pg(STR_PAGES) = PgHd_next(pg_hd)) != NULL)                            \
 | |
|                 PgHd_previous(PgHd_next(pg_hd)) = NULL;                                          \
 | |
| 	    }                                                                                    \
 | |
|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
 | |
|             FREE_PAGE(pg_hd);                                                                    \
 | |
| 	  } else {                                                                               \
 | |
|             if ((STRUCT_NEXT(STR) = (STR_TYPE *) PgHd_free_str(pg_hd)) == NULL) {                \
 | |
|               PgHd_previous(pg_hd) = NULL;                                                       \
 | |
|               if ((PgHd_next(pg_hd) = Pg_free_pg(STR_PAGES)) != NULL)                            \
 | |
|                 PgHd_previous(PgHd_next(pg_hd)) = pg_hd;                                         \
 | |
|               Pg_free_pg(STR_PAGES) = pg_hd;                                                     \
 | |
|             }                                                                                    \
 | |
|             PgHd_free_str(pg_hd) = (void *) STR;                                                 \
 | |
|             UNLOCK(Pg_lock(STR_PAGES));                                                          \
 | |
|           }                                                                                      \
 | |
|         }
 | |
| #endif /*****************************************************************************************/
 | |
| 
 | |
| #define ALLOC_HASH_BUCKETS(BUCKET_PTR, NUM_BUCKETS)                                              \
 | |
|         { int i; void **bucket_ptr;                                                              \
 | |
|           ALLOC_BLOCK(bucket_ptr, NUM_BUCKETS * sizeof(void *), void *);	                 \
 | |
|           BUCKET_PTR = (void *) bucket_ptr;                                                      \
 | |
|           for (i = NUM_BUCKETS; i != 0; i--)                                                     \
 | |
|             *bucket_ptr++ = NULL;                                                                \
 | |
|         }
 | |
| #define FREE_HASH_BUCKETS(BUCKET_PTR)  FREE_BLOCK(BUCKET_PTR)
 | |
| 
 | |
| #define ALLOC_OR_FRAME(STR)            ALLOC_STRUCT(STR, GLOBAL_PAGES_or_fr, struct or_frame)
 | |
| #define FREE_OR_FRAME(STR)             FREE_STRUCT(STR, GLOBAL_PAGES_or_fr, struct or_frame)
 | |
| 
 | |
| #define ALLOC_QG_SOLUTION_FRAME(STR)   ALLOC_STRUCT(STR, GLOBAL_PAGES_qg_sol_fr, struct query_goal_solution_frame)
 | |
| #define FREE_QG_SOLUTION_FRAME(STR)    FREE_STRUCT(STR, GLOBAL_PAGES_qg_sol_fr, struct query_goal_solution_frame)
 | |
| 
 | |
| #define ALLOC_QG_ANSWER_FRAME(STR)     ALLOC_STRUCT(STR, GLOBAL_PAGES_qg_ans_fr, struct query_goal_answer_frame)
 | |
| #define FREE_QG_ANSWER_FRAME(STR)      FREE_STRUCT(STR, GLOBAL_PAGES_qg_ans_fr, struct query_goal_answer_frame)
 | |
| 
 | |
| #define ALLOC_TG_SOLUTION_FRAME(STR)   ALLOC_STRUCT(STR, GLOBAL_PAGES_tg_sol_fr, struct table_subgoal_solution_frame)
 | |
| #define FREE_TG_SOLUTION_FRAME(STR)    FREE_STRUCT(STR, GLOBAL_PAGES_tg_sol_fr, struct table_subgoal_solution_frame)
 | |
| 
 | |
| #define ALLOC_TG_ANSWER_FRAME(STR)     ALLOC_STRUCT(STR, GLOBAL_PAGES_tg_ans_fr, struct table_subgoal_answer_frame)
 | |
| #define FREE_TG_ANSWER_FRAME(STR)      FREE_STRUCT(STR, GLOBAL_PAGES_tg_ans_fr, struct table_subgoal_answer_frame)
 | |
| 
 | |
| #define ALLOC_TABLE_ENTRY(STR)         ALLOC_STRUCT(STR, GLOBAL_PAGES_tab_ent, struct table_entry)
 | |
| #define FREE_TABLE_ENTRY(STR)          FREE_STRUCT(STR, GLOBAL_PAGES_tab_ent, struct table_entry)
 | |
| 
 | |
| #define ALLOC_SUBGOAL_FRAME(STR)       ALLOC_STRUCT(STR, GLOBAL_PAGES_sg_fr, struct subgoal_frame)
 | |
| #define FREE_SUBGOAL_FRAME(STR)        FREE_STRUCT(STR, GLOBAL_PAGES_sg_fr, struct subgoal_frame)
 | |
| 
 | |
| #define ALLOC_DEPENDENCY_FRAME(STR)    ALLOC_STRUCT(STR, GLOBAL_PAGES_dep_fr, struct dependency_frame)
 | |
| #define FREE_DEPENDENCY_FRAME(STR)     FREE_STRUCT(STR, GLOBAL_PAGES_dep_fr, struct dependency_frame)
 | |
| 
 | |
| #define ALLOC_SUSPENSION_FRAME(STR)    ALLOC_STRUCT(STR, GLOBAL_PAGES_susp_fr, struct suspension_frame)
 | |
| #define FREE_SUSPENSION_FRAME(STR)     FREE_BLOCK(SuspFr_global_start(STR));                         \
 | |
|                                        FREE_STRUCT(STR, GLOBAL_PAGES_susp_fr, struct suspension_frame)
 | |
| 
 | |
| #define ALLOC_GLOBAL_TRIE_NODE(STR)    ALLOC_STRUCT(STR, GLOBAL_PAGES_gt_node, struct global_trie_node)
 | |
| #define FREE_GLOBAL_TRIE_NODE(STR)     FREE_STRUCT(STR, GLOBAL_PAGES_gt_node, struct global_trie_node)
 | |
| 
 | |
| #define ALLOC_SUBGOAL_TRIE_NODE(STR)   ALLOC_STRUCT(STR, GLOBAL_PAGES_sg_node, struct subgoal_trie_node)
 | |
| #define FREE_SUBGOAL_TRIE_NODE(STR)    FREE_STRUCT(STR, GLOBAL_PAGES_sg_node, struct subgoal_trie_node)
 | |
| 
 | |
| #ifdef YAPOR
 | |
| #define ALLOC_ANSWER_TRIE_NODE(STR)    ALLOC_NEXT_FREE_STRUCT(STR, GLOBAL_PAGES_ans_node, struct answer_trie_node)
 | |
| #else /* TABLING */
 | |
| #define ALLOC_ANSWER_TRIE_NODE(STR)    ALLOC_STRUCT(STR, GLOBAL_PAGES_ans_node, struct answer_trie_node)
 | |
| #endif /* YAPOR - TABLING */
 | |
| #define FREE_ANSWER_TRIE_NODE(STR)     FREE_STRUCT(STR, GLOBAL_PAGES_ans_node, struct answer_trie_node)
 | |
| 
 | |
| #define ALLOC_GLOBAL_TRIE_HASH(STR)    ALLOC_STRUCT(STR, GLOBAL_PAGES_gt_hash, struct global_trie_hash)
 | |
| #define FREE_GLOBAL_TRIE_HASH(STR)     FREE_STRUCT(STR, GLOBAL_PAGES_gt_hash, struct global_trie_hash)
 | |
| 
 | |
| #define ALLOC_SUBGOAL_TRIE_HASH(STR)   ALLOC_STRUCT(STR, GLOBAL_PAGES_sg_hash, struct subgoal_trie_hash)
 | |
| #define FREE_SUBGOAL_TRIE_HASH(STR)    FREE_STRUCT(STR, GLOBAL_PAGES_sg_hash, struct subgoal_trie_hash)
 | |
| 
 | |
| #define ALLOC_ANSWER_TRIE_HASH(STR)    ALLOC_STRUCT(STR, GLOBAL_PAGES_ans_hash, struct answer_trie_hash)
 | |
| #define FREE_ANSWER_TRIE_HASH(STR)     FREE_STRUCT(STR, GLOBAL_PAGES_ans_hash, struct answer_trie_hash)
 | |
| 
 | |
| 
 | |
| 
 | |
| /************************************************************************
 | |
| **                         Bitmap manipulation                         **
 | |
| ************************************************************************/
 | |
| 
 | |
| #define BITMAP_empty(b)		       ((b) == 0)
 | |
| #define BITMAP_member(b,n)	       (((b) & (1<<(n))) != 0)
 | |
| #define BITMAP_alone(b,n)	       ((b) == (1<<(n)))
 | |
| #define BITMAP_subset(b1,b2)	       (((b1) & (b2)) == b2)
 | |
| #define BITMAP_same(b1,b2)             ((b1) == (b2))
 | |
| #define BITMAP_clear(b)	               ((b) = 0)
 | |
| #define BITMAP_and(b1,b2)              ((b1) &= (b2))
 | |
| #define BITMAP_minus(b1,b2)            ((b1) &= ~(b2))
 | |
| #define BITMAP_insert(b,n)	       ((b) |= (1<<(n)))
 | |
| #define BITMAP_delete(b,n)	       ((b) &= (~(1<<(n))))
 | |
| #define BITMAP_copy(b1,b2)	       ((b1) = (b2))
 | |
| #define BITMAP_intersection(b1,b2,b3)  ((b1) = ((b2) & (b3)))
 | |
| #define BITMAP_difference(b1,b2,b3)    ((b1) = ((b2) & (~(b3))))
 | |
| 
 | |
| 
 | |
| 
 | |
| /************************************************************************
 | |
| **                            Debug macros                             **
 | |
| ************************************************************************/
 | |
| 
 | |
| #define INFORMATION_MESSAGE(MESSAGE,ARGS...)                            \
 | |
|         fprintf(stderr, "[ " MESSAGE " ]\n", ##ARGS)
 | |
| 
 | |
| #ifdef YAPOR
 | |
| #define ERROR_MESSAGE(MESSAGE)                                          \
 | |
|         Yap_Error(INTERNAL_ERROR, TermNil, "W%d - " MESSAGE, worker_id)
 | |
| #else
 | |
| #define ERROR_MESSAGE(MESSAGE)                                          \
 | |
|         Yap_Error(INTERNAL_ERROR, TermNil, MESSAGE)
 | |
| #endif /* YAPOR */
 | |
| 
 | |
| #ifdef DEBUG_TABLING
 | |
| #define TABLING_ERROR_CHECKING(PROCEDURE,TEST)                          \
 | |
|         if (TEST) ERROR_MESSAGE(#PROCEDURE ": " #TEST)
 | |
| #else
 | |
| #define TABLING_ERROR_CHECKING(PROCEDURE,TEST)
 | |
| #endif /* DEBUG_TABLING */
 | |
| 
 | |
| #ifdef DEBUG_YAPOR
 | |
| #define YAPOR_ERROR_CHECKING(PROCEDURE,TEST)                            \
 | |
|         if (TEST) ERROR_MESSAGE(#PROCEDURE ": " #TEST)
 | |
| #else
 | |
| #define YAPOR_ERROR_CHECKING(PROCEDURE,TEST)
 | |
| #endif /* DEBUG_YAPOR */
 | |
| 
 | |
| #ifdef DEBUG_OPTYAP
 | |
| #define OPTYAP_ERROR_CHECKING(PROCEDURE,TEST)                           \
 | |
|         if (TEST) ERROR_MESSAGE(#PROCEDURE ": " #TEST)
 | |
| #else
 | |
| #define OPTYAP_ERROR_CHECKING(PROCEDURE,TEST)
 | |
| #endif /* DEBUG_OPTYAP */
 |