half ADT (nested struct) problem...

Hi,

I ve got problem in implementing ADT in my program,
below I posted my PQ.c, PQ.h -> which is the ADT (not full ADT) you'll see why in my code...and office.c+ office. which is the program using the functions implemented in PQ

this is the code (not full code, but will gives you the idea of my problem):

PQ.h

Code:

---

typedef struct workers PQItem;
//typedef WRecord PQItem;
struct pqueue
{
        int        size;
        PQItem        *item;
};

typedef struct pqueue PQ;

PQ *initPQ( void );
void swapArray( PQItem *arr1, PQItem *arr2 );

---

PQ.c

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include "PQ.h"

PQ *initPQ( void )
{
       
        PQ *pq;

        pq = malloc ( sizeof(PQ) );

        if( pq == NULL )
        {
                fprintf( stderr, "ERROR: Memory allocation for priority queue failed;"
                              "program terminated.\n" );
                exit( EXIT_FAILURE );
        }

        return pq;

}

void swapArray( PQItem *arr1, PQItem *arr2 )
{

        PQItem temp;

        temp = *arr1;
        *arr1 = *arr2;
        *arr2 = temp;

        return;

}

---

office.h

Code:

---

#include "PQ.h"
#define  NAMESIZE  100
#define        BASE          100

        /* Structure Template */

typedef int Time;

struct workers
{
        char  *name;
        Time  starttime;
        Time  stoptime;
};

typedef struct workers WRecord;
//typedef struct workers PQItem;

        /* Functions Prototype */
void usage( char *progname );
FILE *open_file( char *progname, char *fname, const char *mode );
char *alloc_string_memory( int len );
char *get_name( FILE *fp );
WRecord *read_worker( FILE *fp, int workers_total );
Time add_time( Time time1, Time time2);

---

office.c

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "office.h"

int main (argc....)
{
    /* main program here, not related with problem */
}

/*functions here (from function prototype declared in office.h, which is not related as well IMO */

---

My problem is PQItem, where it is the same type as struct workers, but I dont know how to linked the files therefore PQ recognize struct workers (or PQItem or WRecord), there in my program you'll see two appearences of

Code:

---

typedef struct workers PQItem;

---

one with // and without...that's one the combination I ve tried to make the linking work..

but so far what I ve get is these error:
- redefinition error
-or no semicoolon at the end of the struct
-or pointer redeferencing into INCOMPLETE type (this is in swapArray functions in PQ.c, where it doesnt recognize PQItem, and I believe this is the problem, HOW to make PQItem recognized??)

i hope someone can help me or gimme any suggestion,
I dont need full ADT...just semi ADT

thanks

Ferdinand

anyone?