libpthread vs libthr.

[Ivan Voras]

Julian Elischer wrote:

> this is interesting.. there has been a call to remove "fairness"
> as a threading property as it complicates the scheduler.
> It has been said by many that they do not consider this as an important
> feature and it reduces throughput.

IMO both sides are right and fairness should be optional. It will
certainly help some workloads and harm others; leaving it as a (default)
kernel compile option is fine for now, as long as it's documented how to
toggle it (in pthread man page at least).