yap-6.3/packages/myddas/myddas_initialization.c

#if defined MYDDAS_ODBC || defined MYDDAS_MYSQL

#include "Yap.h"
#include <stdio.h>
#include <stdlib.h>
#include "myddas.h"
#include "myddas_structs.h"
#ifdef MYDDAS_STATS
#include "myddas_statistics.h"
#endif

MYDDAS_GLOBAL
myddas_init_initialize_myddas(void){
  MYDDAS_GLOBAL global = NULL;
  
  /* We cannot call MYDDAS_MALLOC were because the global
     register isn't yet initialized */
  global = (MYDDAS_GLOBAL) malloc (sizeof(struct myddas_global));
#ifdef DEBUG
  printf ("MALLOC %p %s %d\n",global,__FILE__,__LINE__);
#endif  
  global->myddas_top_connections = NULL;
#ifdef MYDDAS_TOP_LEVEL
  global->myddas_top_level_connection = NULL;
#endif
#ifdef MYDDAS_STATS
  global->myddas_statistics = (MYDDAS_GLOBAL_STATS) malloc (sizeof(struct myddas_global_stats));
#ifdef DEBUG
  printf ("MALLOC %p %s %d\n",global->myddas_statistics,__FILE__,__LINE__);
#endif  
  global->myddas_statistics->stats = NULL;
#endif

#ifdef DEBUG
  /* We first malloc for this struct and the stats struct */
#ifdef MYDDAS_STATS
  global->malloc_called = 2;
  global->memory_allocated = sizeof(struct myddas_global) + sizeof(struct myddas_global_stats);
#else
  global->malloc_called = 1;
  global->memory_allocated = sizeof(struct myddas_global);
#endif /* MYDDAS_STATS */
  global->free_called = 0;
  global->memory_freed = 0;
#endif
  
  return global;
}

/* Inserts the new node on the front of the list */
MYDDAS_UTIL_CONNECTION 
myddas_init_initialize_connection(void *conn,void *enviromment,
				  MYDDAS_UTIL_CONNECTION next){
  CACHE_REGS
  MYDDAS_UTIL_CONNECTION new = NULL;
  MYDDAS_MALLOC(new,struct myddas_list_connection);
  
  if (new == NULL)
    {
      return NULL;
    }
  new->predicates=NULL;
  new->connection=conn;
  new->odbc_enviromment=enviromment;

  /* It saves n queries, doing at once n+1 queries */
  new->total_number_queries=0; //Default
  new->actual_number_queries=0;
  new->queries = NULL;

  /* List integrity */
  new->next=next;
  new->previous=NULL;
  /* If there's already at least one node 
   on the list */
  if (next != NULL)
    next->previous=new;
  
#ifdef MYDDAS_STATS
  new->stats = NULL;
  new->stats = myddas_stats_initialize_connection_stats();
#endif
  return new;
}

MYDDAS_UTIL_PREDICATE 
myddas_init_initialize_predicate(char *pred_name, int pred_arity,
				 char *pred_module, MYDDAS_UTIL_PREDICATE next){
  CACHE_REGS
  MYDDAS_UTIL_PREDICATE new = NULL;
  MYDDAS_MALLOC(new,struct myddas_list_preds);
  
  if (new == NULL) 
    {
      return NULL;
    }
  new->pred_name=pred_name;
  new->pred_arity=pred_arity;
  new->pred_module=pred_module;
  
  /* List integrity */
  new->next=next;
  new->previous=NULL;
  /* If there's already at least one node 
     on the list */
  if (next != NULL)
    next->previous=new;
  
  return new;
}

#endif