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It seems that spinlocks aren’t that great as they waste CPU cycles when the are waiting (blocking).
If the thread just goes to sleep while waiting for a signal to wakeup, then CPU cycles aren’t lost while spinning.
Maybe it is good to use a spinlock if the locks are held for a very short time, then maybe it uses less time? If this is true why?
Yes, that’s correct.
Because context switches are expensive. The OS and CPU have to do a (relatively) large amount of work to perform a context switch. Spinning for a few cycles instead will be a lot cheaper, even if those cycles are, in theory, wasted.