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SubjectReal-Time and QoS support in planned v2.2 kernel
I understand that V2.2 kernel release can happen in the next few
months. For purpose of planning, will v2.2 kernel be
"as realtime as"

a) solaris 2.6
b) Lynx OS
c) VxWorks

Solaris 2.6 has a good preemtive kernel, but seems
a bit heavy weight for various uses. It also does not
support POSIX priority inheritance/ceiling protocols.
(solaris 2.6 man page says:


Threads Library pthread_mutex_setprioceiling(3T)

NAME
pthread_mutex_setprioceiling, pthread_mutex_getprioceiling -
change the priority ceiling of a mutex

SYNOPSIS
#include <pthread.h>

int pthread_mutex_setprioceiling(pthread_mutex_t *mutex,
int prioceiling, int *old_ceiling);
int pthread_mutex_getprioceiling
(const pthread_mutex_t *mutex, int *prioceiling);

DESCRIPTION
In the current implementation, {_POSIX_THREAD_PRIO_PROTECT}
is undefined and the functions
pthread_mutex_setprioceiling() and
pthread_mutex_getprioceiling() return ENOSYS.
)

Does Linux support these calls?

Also, is the stuff under net/sched (things such as sched_cbq,
sched_csz,
etc.) ready to be used/tested? I can't find any instructions on how
to use these. (altq on FreeBSD has excellent support for CBQ and RSVP,
it seems. It would be nice if Linux can achieve similar capabilities.
I would be willing to help test heavily, if it would help.)


Gautam H. Thaker
Distributed Processing Lab; Lockheed Martin Adv. Tech. Labs
A&E 3W; 1 Federal Street; Camden, NJ 08102
609-338-3907, fax 609-338-4144 email: gthaker@atl.lmco.com

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