Mutexes are faster than Spinlocks

Re:Mutexes are faster than Spinlocks by bubbleRefuge on Saturday January 04, 2020 @10:50AM (#21955495)

couldn't you eliminate the bad spinlock behavior by coding them to be go into an efficient wait if to much spinning is going on ?

[ Parent | on HN ]

Re:Mutexes are faster than Spinlocks by rwem on Saturday January 04, 2020 @10:55AM (#21955530)

That’s what virtually all battle-hardened lock libraries do: spin for a bit (but not too tightly, using a pause in the loop) then fall back to waiter lists and futex.

[ Parent | on HN ]

Re:Mutexes are faster than Spinlocks by anewvillager on Saturday January 04, 2020 @10:59AM (#21955554)

Yes! That's called an optimistic spinning lock!

https://linuxplumbersconf.org/event/4/contributions/286/atta...

[ Parent | on HN ]

Re:Mutexes are faster than Spinlocks by CodeWriter23 on Saturday January 04, 2020 @11:40AM (#21955803)

Or use a mutex and let the scheduler implement equitable dispatching.

[ Parent | on HN ]

Re:Mutexes are faster than Spinlocks by kccqzy on Saturday January 04, 2020 @10:55AM (#21955532)

Yes. And then it becomes an adaptive mutex.

[ Parent | on HN ]