Add initializers

include/zinnia/mutex.h

@@ -6,6 +6,8 @@
 
 typedef _Atomic(uintptr_t) mutex_t;
 
+void mutex_init(mutex_t* mutex);
+
 void mutex_lock(mutex_t* mutex);
 
 bool mutex_trylock(mutex_t* mutex);

include/zinnia/rwlock.h

@@ -8,6 +8,8 @@ struct rwlock {
     atomic_uintptr_t word;
 };
 
+void rwlock_init(struct rwlock* rw);
+
 void rwlock_read_lock(struct rwlock* rw);
 void rwlock_read_unlock(struct rwlock* rw);
 bool rwlock_try_read_lock(struct rwlock* rw);