Lock Elision / Transaction ABI discussion

[Dominik Vogt]

On Mon, Sep 16, 2013 at 06:15:38PM +0200, Andi Kleen wrote:
> The Intel SOM currently has three:
> 
> _XABORT_LOCK_BUSY 0xff lock busy
> _XABORT_ISLOCKED  0xfe lock is locked (not in pthread, but used elsewhere) 
> _XABORT_TRYLOCK   0xfd nested trylock
> 0xf0..0xfc reserved
> 
> I was considering to add a fourth:
> 
> _XABORT_TEMPORARY 0xfc temporary failure, do not adapt
> 
> e.g. to add to the dynamic linker, which currently aborts, to prevent
> useless adaptation at program startup.

Does that mean, if you use the Xabort instruction, you have no way
of controlling bit 1 of the abort status (the retry bit)?

Ciao

Dominik ^_^  ^_^

-- 

Dominik Vogt
IBM Germany