spin_lock_init
# define spin_lock_init(lock) \
# define spin_lock_init(_lock) \
#define spin_lock_init(slock) _spin_lock_init(slock, false)
#define spin_lock_init(x) pthread_mutex_init(x, NULL)
static inline void spin_lock_init(spinlock_t *lock)
static void spin_lock_init(spinlock_t *lock)