-XBT_PUBLIC_CLASS Mutex {
-friend ConditionVariable;
-private:
- friend simgrid::simix::Mutex;
- simgrid::simix::Mutex* mutex_;
- Mutex(simgrid::simix::Mutex* mutex) : mutex_(mutex) {}
-public:
+/** @brief A classical mutex, but blocking in the simulation world
+ * @ingroup s4u_api
+ *
+ * It is strictly impossible to use a real mutex, such as
+ * <a href="http://en.cppreference.com/w/cpp/thread/mutex">std::mutex</a>
+ * or <a href="http://pubs.opengroup.org/onlinepubs/007908775/xsh/pthread_mutex_lock.html">pthread_mutex_t</a>,
+ * because it would block the whole simulation.
+ * Instead, you should use the present class, that is a drop-in replacement of
+ * <a href="http://en.cppreference.com/w/cpp/thread/mutex>std::mutex</a>.
+ *
+ * As for any S4U object, Mutexes are using the @ref s4u_raii "RAII idiom" for memory management.
+ * Use createMutex() to get a ::MutexPtr to a newly created mutex and only manipulate ::MutexPtr.
+ *
+ */
+class XBT_PUBLIC Mutex {
+#ifndef DOXYGEN
+ friend ConditionVariable;
+ friend simgrid::kernel::activity::MutexImpl;
+#endif
+ simgrid::kernel::activity::MutexImpl* pimpl_;
+ explicit Mutex(simgrid::kernel::activity::MutexImpl* mutex) : pimpl_(mutex) {}
+
+ /* refcounting */
+ friend XBT_PUBLIC void intrusive_ptr_add_ref(Mutex* mutex);
+ friend XBT_PUBLIC void intrusive_ptr_release(Mutex* mutex);