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/usr/include/clips/utility.h is in libclips-dev 6.24-3ubuntu1.

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The actual contents of the file can be viewed below.

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   /*******************************************************/
   /*      "C" Language Integrated Production System      */
   /*                                                     */
   /*             CLIPS Version 6.24  06/05/06            */
   /*                                                     */
   /*                 UTILITY HEADER FILE                 */
   /*******************************************************/

/*************************************************************/
/* Purpose: Provides a set of utility functions useful to    */
/*   other modules. Primarily these are the functions for    */
/*   handling periodic garbage collection and appending      */
/*   string data.                                            */
/*                                                           */
/* Principal Programmer(s):                                  */
/*      Gary D. Riley                                        */
/*                                                           */
/* Contributing Programmer(s):                               */
/*                                                           */
/* Revision History:                                         */
/*                                                           */
/*      6.24: Renamed BOOLEAN macro type to intBool.         */
/*                                                           */
/*************************************************************/

#ifndef _H_utility
#define _H_utility

#ifdef LOCALE
#undef LOCALE
#endif

struct cleanupFunction
  {
   char *name;
   void (*ip)(void *);
   int priority;
   struct cleanupFunction *next;
   short int environmentAware;
  };

struct callFunctionItem
  {
   char *name;
   void (*func)(void *);
   int priority;
   struct callFunctionItem *next;
   short int environmentAware;
  };
  
#define UTILITY_DATA 55

struct utilityData
  { 
   struct cleanupFunction *ListOfCleanupFunctions;
   struct cleanupFunction *ListOfPeriodicFunctions;
   short GarbageCollectionLocks;
   short GarbageCollectionHeuristicsEnabled;
   short PeriodicFunctionsEnabled;
   short YieldFunctionEnabled;
   unsigned long EphemeralItemCount;
   unsigned long EphemeralItemSize;
   unsigned long CurrentEphemeralCountMax;
   unsigned long CurrentEphemeralSizeMax;
   void (*YieldTimeFunction)(void);
   int LastEvaluationDepth ;
  };

#define UtilityData(theEnv) ((struct utilityData *) GetEnvironmentData(theEnv,UTILITY_DATA))
  
#ifdef _UTILITY_SOURCE_
#define LOCALE
#else
#define LOCALE extern
#endif

#if ENVIRONMENT_API_ONLY
#define DecrementGCLocks(theEnv) EnvDecrementGCLocks(theEnv)
#define IncrementGCLocks(theEnv) EnvIncrementGCLocks(theEnv)
#define RemovePeriodicFunction(theEnv,a) EnvRemovePeriodicFunction(theEnv,a)
#else
#define DecrementGCLocks() EnvDecrementGCLocks(GetCurrentEnvironment())
#define IncrementGCLocks() EnvIncrementGCLocks(GetCurrentEnvironment())
#define RemovePeriodicFunction(a) EnvRemovePeriodicFunction(GetCurrentEnvironment(),a)
#endif

   LOCALE void                           InitializeUtilityData(void *);
   LOCALE void                           PeriodicCleanup(void *,intBool,intBool);
   LOCALE intBool                        AddCleanupFunction(void *,char *,void (*)(void *),int);
   LOCALE intBool                        EnvAddPeriodicFunction(void *,char *,void (*)(void *),int);
   LOCALE intBool                        AddPeriodicFunction(char *,void (*)(void),int);
   LOCALE intBool                        RemoveCleanupFunction(void *,char *);
   LOCALE intBool                        EnvRemovePeriodicFunction(void *,char *);
   LOCALE char                          *AppendStrings(void *,char *,char *);
   LOCALE char                          *StringPrintForm(void *,char *);
   LOCALE char                          *AppendToString(void *,char *,char *,int *,unsigned *);
   LOCALE char                          *AppendNToString(void *,char *,char *,unsigned,int *,unsigned *);
   LOCALE char                          *ExpandStringWithChar(void *,int,char *,int *,unsigned *,unsigned);
   LOCALE struct callFunctionItem       *AddFunctionToCallList(void *,char *,int,void (*)(void *),
                                                               struct callFunctionItem *,intBool);
   LOCALE struct callFunctionItem       *RemoveFunctionFromCallList(void *,char *,
                                                             struct callFunctionItem *,
                                                             int *);
   LOCALE void                           DeallocateCallList(void *,struct callFunctionItem *);
   LOCALE unsigned                       ItemHashValue(void *,unsigned short,void *,unsigned);
   LOCALE void                           YieldTime(void *);
   LOCALE short                          SetGarbageCollectionHeuristics(void *,short);
   LOCALE void                           EnvIncrementGCLocks(void *);
   LOCALE void                           EnvDecrementGCLocks(void *);
   LOCALE short                          EnablePeriodicFunctions(void *,short);
   LOCALE short                          EnableYieldFunction(void *,short);

#endif