[M3devel] ease of switching between pthreads and userthreads?
hosking at cs.purdue.edu
Thu Apr 28 16:22:36 CEST 2011
On Apr 28, 2011, at 3:29 AM, Olaf Wagner wrote:
> Quoting Tony Hosking <hosking at cs.purdue.edu>:
>> On Apr 27, 2011, at 3:05 AM, Jay K wrote:
>>> About inlining LOCK I was more echoing your past sentiment
>>> than giving my own, and I provided a mitigation:
>>> a) specifically the suggestion that the switchability be an option;
>>> it'd probably be on by default but people that want to squeeze
>>> out the extra performance could enable the inlining
>>> and lose the switchability
>> It is expected that LOCK will be implemented using CAS (and equivalents) in the very near future. I have a student working on it. This will be incompatible with the current user-threads implementation of LOCK. It will be too painful to support both using a compiler switch.
> Couldn't we change the existing user threads to use CAS for locks, too,
> in order to gain runtime switching of thread implementations?
> I have neither thought much about it nor looked at the implementation
> in recent years, so I hope it's no stupid question.
Hmm. Yes, I suppose we could. It might degrade performance of the user-level (uniprocessor) threads implementation.
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