diff --git a/include/sled/lang/attributes.h b/include/sled/lang/attributes.h
index 6e06b92..b91befa 100644
--- a/include/sled/lang/attributes.h
+++ b/include/sled/lang/attributes.h
@@ -1,5 +1,41 @@
 #pragma once
 #ifndef SLED_LANG_ATTRIBUTES_H
 #define SLED_LANG_ATTRIBUTES_H
-#define SLED_DEPRECATED __attribute__((deprecated))
+
+#define SLED_DEPRECATED() __attribute__((deprecated))
+#if defined(__GNUC__) && defined(__SUPPORT_TS_ANNOTATION__) && !defined(SWIG)
+#define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
+#elif defined(__clang__)
+#define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
+#else
+#define THREAD_ANNOTATION_ATTRIBUTE__(x)
+#endif
+
+#if defined(GUARDED_BY)
+#undef GUARDED_BY
+#endif
+#define GUARDED_BY(x) __attribute__((guarded_by(x)))
+
+#if defined(__clang__)
+#define EXCLUSIVE_TRYLOCK_FUNCTION(...)                                        \
+    THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
+
+#define EXCLUSIVE_LOCK_FUNCTION(...)                                           \
+    THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
+
+#define UNLOCK_FUNCTION(...)                                                   \
+    THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
+
+#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
+
+#else
+
+#define EXCLUSIVE_TRYLOCK_FUNCTION(...)                                        \
+    THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock(__VA_ARGS__))
+#define EXCLUSIVE_LOCK_FUNCTION(...)                                           \
+    THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock(__VA_ARGS__))
+#define UNLOCK_FUNCTION(...) THREAD_ANNOTATION_ATTRIBUTE__(unlock(__VA_ARGS__))
+#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(point_to_guarded_by(x))
+#endif
+
 #endif//  SLED_LANG_ATTRIBUTES_H
diff --git a/include/sled/synchronization/event.h b/include/sled/synchronization/event.h
index 1b4c4bc..fd0881f 100644
--- a/include/sled/synchronization/event.h
+++ b/include/sled/synchronization/event.h
@@ -36,7 +36,7 @@ public:
     Mutex mutex_;
     ConditionVariable cv_;
     const bool is_manual_reset_;
-    bool event_status_;
+    bool event_status_ GUARDED_BY(mutex_);
 };
 
 }// namespace sled
diff --git a/include/sled/synchronization/mutex.h b/include/sled/synchronization/mutex.h
index 3ff109c..673addc 100644
--- a/include/sled/synchronization/mutex.h
+++ b/include/sled/synchronization/mutex.h
@@ -5,10 +5,10 @@
  **/
 
 #pragma once
-#include "marl/conditionvariable.h"
 #ifndef SLED_SYNCHRONIZATION_MUTEX_H
 #define SLED_SYNCHRONIZATION_MUTEX_H
 
+#include "marl/conditionvariable.h"
 #include "sled/lang/attributes.h"
 #include "sled/units/time_delta.h"
 #include <chrono>
@@ -61,13 +61,13 @@ public:
     RecursiveMutex(const RecursiveMutex &) = delete;
     RecursiveMutex &operator=(const RecursiveMutex &) = delete;
 
-    inline void Lock() { impl_.lock(); }
+    inline void Lock() EXCLUSIVE_LOCK_FUNCTION() { impl_.lock(); }
 
     inline bool TryLock() { return impl_.try_lock(); }
 
     inline void AssertHeld() {}
 
-    inline void Unlock() { impl_.unlock(); }
+    inline void Unlock() UNLOCK_FUNCTION() { impl_.unlock(); }
 
 private:
     std::recursive_mutex impl_;
@@ -76,14 +76,17 @@ private:
 template<typename TLock,
          typename std::enable_if<internal::HasLockAndUnlock<TLock>::value,
                                  TLock>::type * = nullptr>
-class SLED_DEPRECATED LockGuard final {
+class SLED_DEPRECATED() LockGuard final {
 public:
     LockGuard(const LockGuard &) = delete;
     LockGuard &operator=(const LockGuard &) = delete;
 
-    explicit LockGuard(TLock *lock) : mutex_(lock) { mutex_->Lock(); };
+    explicit LockGuard(TLock *lock) EXCLUSIVE_LOCK_FUNCTION() : mutex_(lock)
+    {
+        mutex_->Lock();
+    };
 
-    ~LockGuard() { mutex_->Unlock(); };
+    ~LockGuard() UNLOCK_FUNCTION() { mutex_->Unlock(); };
 
 private:
     TLock *mutex_;
@@ -102,11 +105,11 @@ private:
     marl::lock lock_;
 };
 
-using MutexGuard SLED_DEPRECATED = MutexLock;
+using MutexGuard SLED_DEPRECATED() = MutexLock;
 // using MutexGuard = marl::lock;
 // using MutexLock = LockGuard<Mutex>;
 // using MutexGuard = LockGuard<Mutex>;
-using RecursiveMutexLock SLED_DEPRECATED = LockGuard<RecursiveMutex>;
+using RecursiveMutexLock SLED_DEPRECATED() = LockGuard<RecursiveMutex>;
 
 // class MutexLock final {
 // public:
diff --git a/include/sled/synchronization/one_time_event.h b/include/sled/synchronization/one_time_event.h
index 4bd31e9..a1a50ed 100644
--- a/include/sled/synchronization/one_time_event.h
+++ b/include/sled/synchronization/one_time_event.h
@@ -25,7 +25,7 @@ public:
     }
 
 private:
-    bool happended_ = false;
+    bool happended_ GUARDED_BY(mutex_) = false;
     Mutex mutex_;
 };
 
diff --git a/include/sled/system/thread.h b/include/sled/system/thread.h
index 1466893..084f1ae 100644
--- a/include/sled/system/thread.h
+++ b/include/sled/system/thread.h
@@ -159,9 +159,9 @@ private:
     void ClearCurrentTaskQueue();
 
     mutable Mutex mutex_;
-    std::queue<std::function<void()>> messages_;
-    std::priority_queue<DelayedMessage> delayed_messages_;
-    uint32_t delayed_next_num_;
+    std::queue<std::function<void()>> messages_ GUARDED_BY(mutex_);
+    std::priority_queue<DelayedMessage> delayed_messages_ GUARDED_BY(mutex_);
+    uint32_t delayed_next_num_ GUARDED_BY(mutex_);
     bool fInitialized_;
     bool fDestroyed_;
     std::atomic<int> stop_;
@@ -183,8 +183,9 @@ public:
 
     AutoSocketServerThread(const AutoSocketServerThread &) = delete;
     AutoSocketServerThread &operator=(const AutoSocketServerThread &) = delete;
+
 private:
-    Thread* old_thread_;
+    Thread *old_thread_;
 };
 
 }// namespace sled