feat: update structure

cs2106/labs/lab3/progs/part1/sema-wrong.c

@@ -0,0 +1,30 @@
+//
+// Program to create shared semaphores
+//
+
+#include <semaphore.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+int main() {
+  sem_t sem;
+  int pid;
+
+  sem_init(&sem, 1, 0);
+
+  if ((pid = fork()) != 0) {
+    printf("Parent! Making my child wait for 1 second.\n");
+    sleep(1);
+    sem_post(&sem);
+  } else {
+    sem_wait(&sem);
+    printf("Child! Waited 1 second for parent.\n");
+  }
+
+  if (pid != 0) {
+    wait(NULL);
+    sem_destroy(&sem);
+  }
+}