WebSVN - shark - Blame - Rev 897 - /shark/trunk/include/modules/posix.h

Rev	Author	Line No.	Line
2	pj	1	/*
		2	* Project: S.Ha.R.K.
		3	*
		4	* Coordinators:
		5	* Giorgio Buttazzo <giorgio@sssup.it>
		6	* Paolo Gai <pj@gandalf.sssup.it>
		7	*
		8	* Authors :
		9	* Paolo Gai <pj@gandalf.sssup.it>
		10	* Massimiliano Giorgi <massy@gandalf.sssup.it>
		11	* Luca Abeni <luca@gandalf.sssup.it>
		12	* (see the web pages for full authors list)
		13	*
		14	* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
		15	*
		16	* http://www.sssup.it
		17	* http://retis.sssup.it
		18	* http://shark.sssup.it
		19	*/
		20
		21
		22	/**
		23	------------
80	pj	24	CVS : $Id: posix.h,v 1.3 2003-03-13 13:39:04 pj Exp $
2	pj	25
		26	File: $File$
80	pj	27	Revision: $Revision: 1.3 $
		28	Last update: $Date: 2003-03-13 13:39:04 $
2	pj	29	------------
		30
		31	This file contains the scheduling module compatible with POSIX
		32	specifications
		33
		34	Title:
		35	POSIX version 1
		36
		37	Task Models Accepted:
		38	NRT_TASK_MODEL - Non-Realtime Tasks
		39	weight field is ignored
		40	slice field is used to set the slice of a task, if it is !=0
		41	policy field is ignored
		42	inherit field is ignored
		43
		44	Description:
		45	This module schedule his tasks following the POSIX specifications...
		46
		47	A task can be scheduled in a Round Robin way or in a FIFO way.
		48	The tasks have also a priority field.
		49
		50	The slices can be different one task from one another.
		51
		52	The module can SAVE or SKIP activations
		53
		54	Exceptions raised:
		55	XUNVALID_GUEST
		56	This level doesn't support guests. When a guest operation
		57	is called, the exception is raised.
		58
		59	Restrictions & special features:
		60	- if specified, it creates at init time a task,
		61	called "Main", attached to the function __init__().
		62	- There must be only one module in the system that creates a task
		63	attached to the function __init__().
		64	- The level tries to guarantee that a RR task uses a "full" timeslice
		65	before going to the queue tail. "full" means that a task can execute
		66	a maximum time of slice+sys_tick due to the approx. done by
		67	the Virtual Machine. If a task execute more time than the slice,
		68	the next time it execute less...
		69
		70	**/
		71
		72	/*
		73	* Copyright (C) 2000 Paolo Gai
		74	*
		75	* This program is free software; you can redistribute it and/or modify
		76	* it under the terms of the GNU General Public License as published by
		77	* the Free Software Foundation; either version 2 of the License, or
		78	* (at your option) any later version.
		79	*
		80	* This program is distributed in the hope that it will be useful,
		81	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		82	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		83	* GNU General Public License for more details.
		84	*
		85	* You should have received a copy of the GNU General Public License
		86	* along with this program; if not, write to the Free Software
		87	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		88	*
		89	*/
		90
		91
		92	#ifndef __POSIX_H__
		93	#define __POSIX_H__
		94
		95	#include <ll/ll.h>
		96	#include <kernel/config.h>
		97	#include <sys/types.h>
		98	#include <kernel/types.h>
80	pj	99	#include "ll/sys/cdefs.h"
2	pj	100
80	pj	101	__BEGIN_DECLS
		102
2	pj	103	extern TASK __init__(void *arg);
		104
		105
		106
		107	/+ Const: +/
		108	#define POSIX_MINIMUM_SLICE 1000 /+ Minimum Timeslice +/
		109	#define POSIX_MAXIMUM_SLICE 500000 /+ Maximum Timeslice +/
		110
		111	#define POSIX_MAIN_YES 1 /+ The level creates the main +/
		112	#define POSIX_MAIN_NO 0 /+ The level does'nt create the main +/
		113
		114	/*+ Registration function:
		115	TIME slice the slice for the Round Robin queue
		116	int createmain 1 if the level creates the main task 0 otherwise
38	pj	117	struct multiboot_info *mb used if createmain specified
		118
		119	returns the level number at which the module has been registered.
		120	+*/
		121	LEVEL POSIX_register_level(TIME slice,
2	pj	122	int createmain,
		123	struct multiboot_info *mb,
		124	int prioritylevels);
		125
		126	/*+ this function forces the running task to go to his queue tail,
		127	then calls the scheduler and changes the context
		128	(it works only on the POSIX level) +*/
		129	int POSIX_sched_yield(LEVEL l);
		130
		131	/* the following functions have to be called with interruptions DISABLED! */
		132
		133	/+ this function returns the maximum level allowed for the POSIX level +/
		134	int POSIX_get_priority_max(LEVEL l);
		135
		136	/+ this function returns the default timeslice for the POSIX level +/
		137	int POSIX_rr_get_interval(LEVEL l);
		138
		139	/*+ this functions returns some paramaters of a task;
		140	policy must be NRT_RR_POLICY or NRT_FIFO_POLICY;
		141	priority must be in the range [0..prioritylevels]
		142	returns ENOSYS or ESRCH if there are problems +*/
		143	int POSIX_getschedparam(LEVEL l, PID p, int policy, int priority);
		144
		145	/+ this functions sets paramaters of a task +/
		146	int POSIX_setschedparam(LEVEL l, PID p, int policy, int priority);
		147
80	pj	148	__END_DECLS
2	pj	149	#endif
		150
		151	/*
		152	MANCANO
		153	13.3.6 GETPRIORITYMin da mettere a 0
		154	*/

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