1 files changed, 2 insertions, 0 deletions
diff --git a/main.h b/main.h
index e437853..db38aa8 100644
--- a/main.h
+++ b/main.h
@@ -16,7 +16,9 @@ extern char *magicstr;
 
 struct hello_dev {
     dev_t devnum;
+    struct semaphore sem;
     struct cdev cdev; /* char device */
+
     /* for r/w operations */
     char hello_buffer[HELLO_KERNEL_BUFF_LEN];
     size_t buff_index;