first commit

CS4210/Project 3/common/shared_memory/shared_memory.h

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+#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