* [9fans] Real time Glenda
@ 2012-04-21 19:38 Don Bailey
2012-04-21 19:43 ` Andreas Wagner
2012-04-21 19:46 ` Iruatã Souza
0 siblings, 2 replies; 4+ messages in thread
From: Don Bailey @ 2012-04-21 19:38 UTC (permalink / raw)
To: 9fans
Has anyone attempted to create a real time version of Plan 9? What would this effort require? Would substantial changes to the kernel be needed?
D
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] Real time Glenda
2012-04-21 19:38 [9fans] Real time Glenda Don Bailey
@ 2012-04-21 19:43 ` Andreas Wagner
2012-04-21 21:24 ` Lyndon Nerenberg
2012-04-21 19:46 ` Iruatã Souza
1 sibling, 1 reply; 4+ messages in thread
From: Andreas Wagner @ 2012-04-21 19:43 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
http://doc.cat-v.org/plan_9/real_time/
On Sat, Apr 21, 2012 at 3:38 PM, Don Bailey <don.bailey@gmail.com> wrote:
> Has anyone attempted to create a real time version of Plan 9? What would this effort require? Would substantial changes to the kernel be needed?
>
> D
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] Real time Glenda
2012-04-21 19:38 [9fans] Real time Glenda Don Bailey
2012-04-21 19:43 ` Andreas Wagner
@ 2012-04-21 19:46 ` Iruatã Souza
1 sibling, 0 replies; 4+ messages in thread
From: Iruatã Souza @ 2012-04-21 19:46 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
On Sat, Apr 21, 2012 at 4:38 PM, Don Bailey <don.bailey@gmail.com> wrote:
> Has anyone attempted to create a real time version of Plan 9? What would this effort require? Would substantial changes to the kernel be needed?
>
> D
http://doc.cat-v.org/plan_9/real_time/
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] Real time Glenda
2012-04-21 19:43 ` Andreas Wagner
@ 2012-04-21 21:24 ` Lyndon Nerenberg
0 siblings, 0 replies; 4+ messages in thread
From: Lyndon Nerenberg @ 2012-04-21 21:24 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
From proc(3):
period nu Set the real-time scheduling period of the process
to nu, where n is an optionally signed number con-
taining an optional decimal point and u is one of
s, ms, us, µs, ns, or empty. The time is inter-
preted, respectively, as seconds, milliseconds,
microseconds, microseconds, nanoseconds, or, in
the case of an absent units specifier, as
nanoseconds. If the time specifier is signed, it
is interpreted as an increment or decrement from a
previously set value. See also the admit command
below.
deadline nu
Set the real-time deadline interval of the process
to nu, where n and u are interpreted as for period
above.
cost nu Set the real-time cost (maximum CPU time per
period) of the process to nu, where n and u are
interpreted as for period above.
sporadic Use sporadic scheduling for the real-time process.
The description of the admit command below con-
tains further details.
yieldonblock
Make the real-time process yield on blocking I/O.
The description of the admit command below con-
tains further details.
admit Given real-time period, deadline and cost are set
(an unset deadline will set deadline to period),
perform a schedulability test and start scheduling
the process as a real-time process if the test
succeeds. If the test fails, the write will fail
with error set to the reason for failure.
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2012-04-21 19:38 [9fans] Real time Glenda Don Bailey
2012-04-21 19:43 ` Andreas Wagner
2012-04-21 21:24 ` Lyndon Nerenberg
2012-04-21 19:46 ` Iruatã Souza
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