run oldstack on g0's stack, just like newstack does,
so that oldstack can free the old stack.
R=r
DELTA=53 (44 added, 0 deleted, 9 changed)
OCL=20404
CL=20433
* rewrite lock implementation to be correct
(tip: never assume that an algorithm you found
in a linux man page is correct.)
* delete unneeded void* arg from clone fn
* replace Rendez with Note
* comment mal better
* use 6c -w, fix warnings
* mark all assembly functions 7
R=r
DELTA=828 (338 added, 221 deleted, 269 changed)
OCL=13884
CL=13886
* kick off new os procs (machs) as needed
* add sys·sleep for testing
* add Lock, Rendez
* properly lock mal, sys·newproc, scheduler
* linux syscall arg #4 is in R10, not CX
* chans are not multithread-safe yet
* multithreading disabled by default;
set $gomaxprocs=2 (or 1000) to turn it on
This should build on OS X but may not.
Rob and I will fix soon after submitting.
TBR=r
OCL=13784
CL=13842
