On Wed, Apr 19, 2023 at 4:17 PM Noah Goldstein via Libc-alpha <
libc-alpha@sourceware.org> wrote:

> On Tue, Apr 18, 2023 at 4:37 PM H.J. Lu via Libc-alpha
> <libc-alpha@sourceware.org> wrote:
>
> i.e
> Futex = O(10^4) cycles
> Spin = O(10^2) cycles
>
> TIMED_NP Short Critical Section uses Futex: O(10^4) Cycles
> TIMED_NP Long Critical Section uses futex: O(10^4) Cycles
>
>
> ADAPTIVE_NP Short Critical Section uses spin: O(10^2) Cycles
> ADAPTIVE_NP Long Critical Section uses spin + futex: O(10^2) + O(10^4)
> = O(10^4) Cycles
>
>
>
If this is indeed the case.. Why is it not the default.. ? A quick read of
docs says  PTHREAD_MUTEX_INITIALIZER and PTHREAD_MUTEX_NORMAL are up to the
implementation to choose..