cooked

1.c

@@ -0,0 +1,81 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<unistd.h>
+#include<sys/ipc.h>
+#include<sys/wait.h>
+#include<semaphore.h>
+#include<sys/shm.h>
+#include<fcntl.h>
+
+#define BUFFER_SIZE 5
+
+struct shared{
+    int buffer[BUFFER_SIZE];
+    int in;
+    int out;
+};
+
+int main(){
+    int n;
+    printf("\nhow many items to produce? ");
+    scanf("%d", &n);
+
+    int shmid = shmget(IPC_PRIVATE, sizeof(struct shared), IPC_CREAT | 0666);
+    struct shared* s = (struct shared* )shmat(shmid, NULL, 0);
+    s->in = 0;
+    s->out = 0;
+
+    sem_unlink("/mutex");
+    sem_unlink("/empty");
+    sem_unlink("/full");
+    sem_t *mutex = sem_open("/mutex", O_CREAT, 0644, 1);
+    sem_t *empty = sem_open("/empty", O_CREAT, 0644, BUFFER_SIZE);
+    sem_t *full = sem_open("/full", O_CREAT, 0644, 0);
+
+    if(fork()==0){
+        for(int i =1;i<=n;i++){
+            sem_wait(empty);
+            sem_wait(mutex);
+            s->buffer[s->in] = i;
+            printf("produced: %d slot: %d\n", i, s->in);
+            s->in = (s->in+1)%BUFFER_SIZE;
+
+            sem_post(mutex);
+            sem_post(full);
+            sleep(1);
+
+        }
+        exit(0);
+    }
+    
+    if(fork()==0){
+        for(int i =1;i<=n;i++){
+            sem_wait(full);
+            sem_wait(mutex);
+            int item = s->buffer[s->out];
+            printf("consumed: %d slot: %d\n", item, s->out);
+            s->out = (s->out+1)%BUFFER_SIZE;
+
+            sem_post(mutex);
+            sem_post(empty);
+            sleep(2);
+
+        }
+        exit(0);
+    }
+    wait(NULL);
+    wait(NULL);
+
+    shmdt(s);
+    shmctl(shmid, IPC_RMID, NULL);
+    sem_unlink("/mutex");
+    sem_unlink("/empty");
+    sem_unlink("/full");
+    
+    return 0;
+
+
+
+
+    
+}