#ifndef _CHAT_H
#define _CHAT_H

#include <pthread.h>

#define LBUFFSIZE 128
#define CBUFFSIZE 331

#define INCRSLOT(V) {   \
 ++(*V) ;               \
 if ((*V) >= CBUFFSIZE) \
   (*V) = 0 ;           \
}

enum Lstates {UNUSED, MESSAGE} ;

struct linebuff {
  enum Lstates status;       /* status of this linebuffer */
  int     created ;          /* Time (seconds since 1970?) entry was made */
  int     size ;             /* number of characters used in buffer */
  char    buff[LBUFFSIZE] ;  /* characters of the buffer */
} ;

struct chatbuff {
  int     nextSlot ;         /* Index of nextSlot to use */
  pthread_mutex_t  nextSlotMutex ;
  pthread_cond_t   nextSlotConditional ;
  struct linebuff buff[CBUFFSIZE] ;
  /* We didn't talk about this one in class...
   * Using it requires you to define _GNU_SOURCE in the Makefile
   * There probably is a better way to do this
   */
  pthread_rwlock_t buffRWlock[CBUFFSIZE] ;
} ;

struct ptGenericArg {
  struct chatbuff *G ;       /* Pointer to the global chatbuff */
  int sock ;                 /* File Descriptor for socket */
} ;

/* prototypes for pthread_create */

void *InputFromUser(void *) ;
void *OutputToUser(void *) ;
void *InputRecept(void *) ;
void *OutputRecept(void *) ;
void *MessageReaper(void *) ;
  
#endif