Add cpuset, an api for thread to cpu binding and cpu resource grouping

and assignment.
 - Add a reference to a struct cpuset in each thread that is inherited from
   the thread that created it.
 - Release the reference when the thread is destroyed.
 - Add prototypes for syscalls and macros for manipulating cpusets in
   sys/cpuset.h
 - Add syscalls to create, get, and set new numbered cpusets:
   cpuset(), cpuset_{get,set}id()
 - Add syscalls for getting and setting affinity masks for cpusets or
   individual threads: cpuid_{get,set}affinity()
 - Add types for the 'level' and 'which' parameters for the cpuset.  This
   will permit expansion of the api to cover cpu masks for other objects
   identifiable with an id_t integer.  For example, IRQs and Jails may be
   coming soon.
 - The root set 0 contains all valid cpus.  All thread initially belong to
   cpuset 1.  This permits migrating all threads off of certain cpus to
   reserve them for special applications.

Sponsored by:	Nokia
Discussed with:	arch, rwatson, brooks, davidxu, deischen
Reviewed by:	antoine

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/sys/_types.h b/sys/sys/_types.h
index 6f1f74a..bee2cca 100644
--- a/sys/sys/_types.h
+++ b/sys/sys/_types.h
@@ -61,6 +61,9 @@ typedef	struct __timer	*__timer_t;	/* timer_gettime()... */
 typedef	struct __mq	*__mqd_t;	/* mq_open()... */
 typedef	__uint32_t	__uid_t;
 typedef	unsigned int	__useconds_t;	/* microseconds (unsigned) */
+typedef	int		__cpuwhich_t;	/* which parameter for cpuset. */
+typedef	int		__cpulevel_t;	/* level parameter for cpuset. */
+typedef int		__cpusetid_t;	/* cpuset identifier. */
 
 /*
  * Unusual type definitions.