Re: PR/49816 CVS commit: src/libexec/ld.elf_so

[Masao Uebayashi <uebayasi%gmail.com@localhost>]

>  I don't think that's relevant, this is about global visiblity of
>  changes. E.g. if another thread tries to get the mutex, it must see all
>  changes from the current thread when successfully acquired the mutex.
>
>  Joerg

I can't follow... Your first message was:

> None of those should matter on amd64? CAS has an implicit total memory
> barrier, so this seems to just add a lot of overhead for no reason.

If you're talking about atomic vs. memory barrier, isn't it something
addressed by the new C11 atomic API?  Kernel mutex code has
MUTEX_RECEIVE()/MUTEX_GIVE() for that purpose (IIUC).