#ifndef _SHARED_MEMORY_H_
#define _SHARED_MEMORY_H_

#include <sys/shm.h>
#include <semaphore.h>

#define NBUFF 4                /* Number of Shared Memory Segments   */

#define SHMKEY  ((key_t) 7890) /* Shared Memory Key                  */
#define SEMPROX ((key_t) 7891) /* Shared Memory Proxy Semaphore Key  */
#define SEMSERV ((key_t) 7892) /* Shared Memory Server Semaphore Key */

#define PERMS 0666             /* Shared Memory Permissions          */
#define BUFFSIZE 1024            /* Buffer Size (Bytes)                */

extern int shmid[NBUFF];     /* Shared Memory Segment Array    */
extern char* buffptr[NBUFF]; /* Used for each process to attach to */
extern int semprox;                 /* Proxy Shared Memory Semaphore  */
extern int semserv;                 /* Server Shared Memory Semaphore */

typedef struct shmemNode {
    int shmid;
    int semIndex;
    char* buff;
    struct shmemNode *next;
} shmemNode;


/////////////
// Getters //
/////////////
int get_semserv();
int get_semprox();


////////////////////////////////
// Methods                    //
//god I wish we could use C++ //
////////////////////////////////
int init_shared_memory();
int attach_shared_memory();

void destroy_shared_memory();
void detach_shared_memory();

void *attach_to_shmem(int index);

shmemNode *getSharedMemorySegment();
void releaseSharedMemorySegment(shmemNode* node);

#endif