Add initializers

lib/mutex.c

@@ -32,6 +32,10 @@ static inline bool owner_is_running(uintptr_t owner) {
     return atomic_load(&((struct task*)owner)->on_cpu, ATOMIC_RELAXED);
 }
 
+void mutex_init(mutex_t* mutex) {
+    atomic_store(mutex, 0, ATOMIC_RELAXED);
+}
+
 bool mutex_trylock(mutex_t* mutex) {
     uintptr_t self = self_token();
     uintptr_t word = atomic_load(mutex, ATOMIC_RELAXED);

lib/rwlock.c

@@ -41,6 +41,10 @@ static inline uint8_t priority_of(struct task* task) {
     return atomic_load(&task->priority, ATOMIC_RELAXED);
 }
 
+void rwlock_init(struct rwlock* rw) {
+    atomic_store(&rw->word, 0, ATOMIC_RELAXED);
+}
+
 bool rwlock_try_read_lock(struct rwlock* rw) {
     uintptr_t word = atomic_load(&rw->word, ATOMIC_RELAXED);
     while (!(word & (RW_WRITE_LOCK | RW_WRITE_WANT))) {