Upon successful completion, the pthread_spin_init() function returns 0. Otherwise, one of the following error codes is returned.
EAGAIN
Description:The system lacks the necessary resources to initialize another spin lock.
EBUSY
Description:The system has detected an attempt to initialize or destroy a spin lock while the lock is in use (for example, while being used in a pthread_spin_lock() call) by another thread.
EINVAL
Description:The value specified by lock is invalid.