Add semaphore functions implementations

fb_arc_set/shared/sem.c

@@ -0,0 +1,41 @@
+#ifndef LIBRARIES
+#define LIBRARIES
+#define _GNU_SOURCE
+#include <fcntl.h> ///< For O_* constants *
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#endif
+
+#include <semaphore.h> ///< For semaphores
+
+#define FREE_SEM_NAME "/11777707_free"
+#define USED_SEM_NAME "/11777707_used"
+#define MUTEX_NAME "/11777707_mutex"
+
+static sem_t *free_sem;
+static sem_t *used_sem;
+static sem_t *mutex;
+
+sem_t * open_sem(char *sem_name, size_t sem_size) {
+    sem_t *res = sem_open(sem_name, O_CREAT | O_EXCL, 0600, sem_size);
+    if(res == SEM_FAILED) {
+        fprintf(stderr, "ERROR: Failed opening semaphore\n");
+        exit(EXIT_FAILURE);
+    }
+    return res;
+}
+
+void close_sem(sem_t *sem) {
+    if(sem_close(sem) < 0) {
+        fprintf(stderr, "ERROR: Failed closing semaphore\n");
+        exit(EXIT_FAILURE);
+    }
+}
+
+void destroy_sem(char *sem_name) {
+    if(sem_unlink(sem_name) < 0) {
+        fprintf(stderr, "ERROR: Failed closing semaphore\n");
+        exit(EXIT_FAILURE);
+    }
+}

fb_arc_set/shared/shm.c

@@ -1,22 +1,28 @@
+#ifndef LIBRARIES
+#define LIBRARIES
 #define _GNU_SOURCE
-#include <fcntl.h>
+#include <fcntl.h> ///< For O_* constants *
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
+#endif
+
+#include <string.h>
 #include <sys/mman.h>
 #include <sys/types.h>
-#include <unistd.h>
-#include <string.h>
 
-#define TERMINATE_SHM "/terminate"
-#define TERMINATE_SHM_SIZE 8
+#define BUFFER_SHM_NAME "/11777707_buff"
 
-void* open_shm(char *shm_name, size_t shm_size) {
+int create_shmfd(char *shm_name) {
     int shmfd = shm_open(shm_name, O_RDWR | O_CREAT, 0600);
     if(shmfd == -1) {
         fprintf(stderr, "ERROR: Failed creating shared memory object\n");
         exit(EXIT_FAILURE);
     }
+    return shmfd;
+}
 
+void* open_shm(int shmfd, size_t shm_size) {
     if(ftruncate(shmfd, shm_size) < 0) {
         fprintf(stderr, "ERROR: Failed truncating shared memory object\n");
         exit(EXIT_FAILURE);
@@ -44,9 +50,13 @@ void close_shm(void* shm, size_t shm_size) {
     }
 }
 
-void destroy_shm(char *shm_name) {
+void destroy_shm(char *shm_name, int shmfd) {
     if (shm_unlink(shm_name) == -1) {
         fprintf(stderr, "ERROR: Failed unlinking shared memory object\n");
         exit(EXIT_FAILURE);
     }
+    if(close(shmfd) < 0) {
+        fprintf(stderr, "ERROR: Failed closing file descriptor\n");
+        exit(EXIT_FAILURE);
+    }
 }

fb_arc_set/shared/structs.c

@@ -0,0 +1,23 @@
+#include <stdbool.h> ///< For boolean constants
+
+#define BUFF_SIZE 8
+#define SET_MAX_SIZE 8
+
+/// Struct for the edge
+typedef struct edge {
+    int u, v;
+} edge_t;
+
+/// Struct for the feedback arc set
+typedef struct fb_set {
+    bool valid;
+    edge_t edges[SET_MAX_SIZE];
+} fb_set_t;
+
+/// Struct for the circular buffer
+typedef struct buffer {
+    bool terminate;
+    fb_set_t sets[BUFF_SIZE];
+} buffer_t;
+
+static buffer_t *circ_buffer;