--- /dev/null
+#ifndef MSP_CORE_MUTEX_PRIVATE_H_
+#define MSP_CORE_MUTEX_PRIVATE_H_
+
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <pthread.h>
+#endif
+#include "mutex.h"
+
+namespace Msp {
+
+struct Mutex::Private
+{
+#ifdef WIN32
+ CRITICAL_SECTION crit;
+#else
+ pthread_mutex_t mutex;
+#endif
+};
+
+} // namespace Msp
+
+#endif