private extern class NativePthreadKey in "C" `{ pthread_key_t * `}
	new `{
		pthread_key_t *key = malloc(sizeof(pthread_key_t));
		int r = pthread_key_create(key, NULL);
		if (r != 0) {
			free(key);
			return NULL;
		}
		return key;
	`}

	fun get: nullable Object `{
		void *val = pthread_getspecific(*self);
		if (val == NULL) val = null_Object();
		return val;
	`}

	fun set(val: nullable Object) `{
		pthread_setspecific(*self, val);
	`}
end