0,0 → 1,100 |
/* |
* 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: pistar.h,v 1.1 2004-09-01 08:42:15 trimarchi Exp $ |
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File: $File$ |
Revision: $Revision: 1.1 $ |
Last update: $Date: 2004-09-01 08:42:15 $ |
------------ |
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This file contains the Priority Inheritance (PI) Protocol |
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Title: |
PI (Priority Inheritance protocol) |
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Resource Models Accepted: |
None |
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Description: |
This module implement the Priority Inheritance Protocol. |
The priority inheritance is made using the shadow field of the |
task descriptor. No difference is made upon the task model of the |
tasks that use PISTAR mutexes. |
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A PISTAR mutex is created passing the PISTAR_mutexattr structure to mutex_init. |
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Exceptions raised: |
XMUTEX_OWNER_KILLED |
This exception is raised when a task ends and it owns one or more |
mutexes |
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Restrictions & special features: |
- This module is NOT Posix compliant |
- This module can manage any number of PISTAR mutexes. |
- If a task ends (because it reaches the end of the body or because it |
is killed by someone) and it owns some mutex, an exception is raised. |
- if a mutex unlock is called on a mutex not previously |
locked or previously locked by another task an exception is raised |
- A PISTAR mutex can be statically allocated. To do this, the init function |
have to define a macro that puts this information in the mutex |
descriptor: mutexlevel = <PISTAR resource level>; opt = NULL; |
for example, if the PISTAR module is registered at level 1, the macro is |
like: |
#define MUTEX_INITIALIZER {1,NULL} |
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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 __PISTAR_H__ |
#define __PISTAR_H__ |
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#include <kernel/types.h> |
#include "ll/sys/cdefs.h" |
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__BEGIN_DECLS |
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RLEVEL PISTAR_register_module(void); |
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__END_DECLS |
#endif |