From dc5c983dd7582ba9d10c4172949eaa424786cb2c Mon Sep 17 00:00:00 2001
From: bartfaik04 <gamemc024@gmail.com>
Date: Sat, 31 May 2025 13:00:34 +0200
Subject: [PATCH] Guarder protected with semaphor

---
 src/guarder.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/guarder.h b/src/guarder.h
index 00774dd..3579548 100644
--- a/src/guarder.h
+++ b/src/guarder.h
@@ -4,20 +4,33 @@
 #include <sys/types.h>
 #include <sys/shm.h>
 #include <sys/ipc.h>
+#include <sys/sem.h>
+#include <unistd.h>
 
 class guarder{
 private:
     const int shmid;
+    const int semid;
+
+    void semaphoreOp(int op) {
+        struct sembuf sb{};
+        sb.sem_num = 0;
+        sb.sem_op = op;
+        sb.sem_flg = 0;
+        semop(semid, &sb, 1);
+    }
 
     void setFlag(bool value)
     {
+        semaphoreOp(-1);
         bool *flag = static_cast<bool *>(shmat(shmid, nullptr, 0));
         *flag = value;
         shmdt(flag);
+        semaphoreOp(1);
     }
 
 public:
-    guarder() : shmid(shmget(IPC_PRIVATE, sizeof(bool), 0666 | IPC_CREAT))
+    guarder() : shmid(shmget(IPC_PRIVATE, sizeof(bool), 0666 | IPC_CREAT)), semid(semget(IPC_PRIVATE, 1, 0666 | IPC_CREAT))
     {
         setFlagOff();
     }
@@ -34,15 +47,18 @@ public:
 
     bool isFlagOn()
     {
+        semaphoreOp(-1);
         bool *flag = static_cast<bool *>(shmat(shmid, nullptr, 0));
         bool ret = *flag;
         shmdt(flag);
+        semaphoreOp(1);
         return ret;
     }
 
     ~guarder()
     {
         shmctl(shmid, IPC_RMID, nullptr);
+        semctl(semid, 0, IPC_RMID);
     }
 
 };
-- 
2.49.1