update

os/mutex.cpp

@@ -46,8 +46,8 @@ void zmutex::unlock() {
 /*******************************************************************************
  *                                 zlock_guard                                 *
  *******************************************************************************/
-zlock_guard::zlock_guard(zmutex* mutex) {
+zlock_guard::zlock_guard(zmutex& mutex) : m_mutex(mutex) {
   m_mutex = mutex;
-  m_mutex->lock();
+  m_mutex.lock();
 }
-zlock_guard::~zlock_guard() { m_mutex->unlock(); }
+zlock_guard::~zlock_guard() { m_mutex.unlock(); }

os/mutex.hpp

@@ -21,8 +21,10 @@ class zmutex {
 };
 
 class zlock_guard {
-  zmutex* m_mutex;
-  zlock_guard(zmutex* mutex);
+  zmutex& m_mutex;
+
+ public:
+  zlock_guard(zmutex& mutex);
   ~zlock_guard();
 };