py/modthread: Implement lock object, for creating a mutex.
diff --git a/py/mpthread.h b/py/mpthread.h
index bbf27da..498380a 100644
--- a/py/mpthread.h
+++ b/py/mpthread.h
@@ -39,6 +39,9 @@
mp_state_thread_t *mp_thread_get_state(void);
void mp_thread_set_state(void *state);
void mp_thread_create(void *(*entry)(void*), void *arg, size_t stack_size);
+void mp_thread_mutex_init(mp_thread_mutex_t *mutex);
+int mp_thread_mutex_lock(mp_thread_mutex_t *mutex, int wait);
+void mp_thread_mutex_unlock(mp_thread_mutex_t *mutex);
#endif // MICROPY_PY_THREAD