0,0 → 1,142 |
/* |
* Project: S.Ha.R.K. |
* |
* Coordinators: |
* Giorgio Buttazzo <giorgio@sssup.it> |
* Paolo Gai <pj@gandalf.sssup.it> |
* |
* Authors : |
* Paolo Gai <pj@gandalf.sssup.it> |
* Massimiliano Giorgi <massy@gandalf.sssup.it> |
* Luca Abeni <luca@gandalf.sssup.it> |
* (see the web pages for full authors list) |
* |
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
* |
* http://www.sssup.it |
* http://retis.sssup.it |
* http://shark.sssup.it |
*/ |
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/** |
------------ |
CVS : $Id: posixstar.h,v 1.1 2003-06-18 08:13:53 trimarchi Exp $ |
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File: $File$ |
Revision: $Revision: 1.1 $ |
Last update: $Date: 2003-06-18 08:13:53 $ |
------------ |
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This file contains the scheduling module compatible with POSIX |
specifications |
|
Title: |
POSIX version 1 |
|
Task Models Accepted: |
NRT_TASK_MODEL - Non-Realtime Tasks |
weight field is ignored |
slice field is used to set the slice of a task, if it is !=0 |
policy field is ignored |
inherit field is ignored |
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Description: |
This module schedule his tasks following the POSIX specifications... |
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A task can be scheduled in a Round Robin way or in a FIFO way. |
The tasks have also a priority field. |
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The slices can be different one task from one another. |
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The module can SAVE or SKIP activations |
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Exceptions raised: |
XUNVALID_GUEST |
This level doesn't support guests. When a guest operation |
is called, the exception is raised. |
|
Restrictions & special features: |
- if specified, it creates at init time a task, |
called "Main", attached to the function __init__(). |
- There must be only one module in the system that creates a task |
attached to the function __init__(). |
- The level tries to guarantee that a RR task uses a "full" timeslice |
before going to the queue tail. "full" means that a task can execute |
a maximum time of slice+sys_tick due to the approx. done by |
the Virtual Machine. If a task execute more time than the slice, |
the next time it execute less... |
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**/ |
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/* |
* Copyright (C) 2000 Paolo Gai |
* |
* This program is free software; you can redistribute it and/or modify |
* it under the terms of the GNU General Public License as published by |
* the Free Software Foundation; either version 2 of the License, or |
* (at your option) any later version. |
* |
* This program is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
* GNU General Public License for more details. |
* |
* You should have received a copy of the GNU General Public License |
* along with this program; if not, write to the Free Software |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
* |
*/ |
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#ifndef __POSIXSTAR_H__ |
#define __POSIXSTAR_H__ |
|
#include <ll/ll.h> |
#include <kernel/config.h> |
#include <sys/types.h> |
#include <kernel/types.h> |
//#define POSIXSTAR_DEBUG |
|
/*+ Const: +*/ |
#define POSIXSTAR_MINIMUM_SLICE 1000 /*+ Minimum Timeslice +*/ |
#define POSIXSTAR_MAXIMUM_SLICE 500000 /*+ Maximum Timeslice +*/ |
|
/*+ Registration function: |
TIME slice the slice for the Round Robin queue |
int createmain 1 if the level creates the main task 0 otherwise |
struct multiboot_info *mb used if createmain specified |
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returns the level number at which the module has been registered. |
+*/ |
LEVEL POSIXSTAR_register_level(int budget, int master, TIME slice, |
int prioritylevels); |
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/*+ this function forces the running task to go to his queue tail, |
then calls the scheduler and changes the context |
(it works only on the POSIX level) +*/ |
int POSIXSTAR_sched_yield(LEVEL l); |
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/* the following functions have to be called with interruptions DISABLED! */ |
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/*+ this function returns the maximum level allowed for the POSIX level +*/ |
int POSIXSTAR_get_priority_max(LEVEL l); |
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/*+ this function returns the default timeslice for the POSIX level +*/ |
int POSIXSTAR_rr_get_interval(LEVEL l); |
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/*+ this functions returns some paramaters of a task; |
policy must be NRT_RR_POLICY or NRT_FIFO_POLICY; |
priority must be in the range [0..prioritylevels] |
returns ENOSYS or ESRCH if there are problems +*/ |
int POSIXSTAR_getschedparam(LEVEL l, PID p, int *policy, int *priority); |
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/*+ this functions sets paramaters of a task +*/ |
int POSIXSTAR_setschedparam(LEVEL l, PID p, int policy, int priority); |
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#endif |
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/* |
MANCANO |
13.3.6 GETPRIORITYMin da mettere a 0 |
*/ |