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/*
* 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
*/
/**
------------
CVS : $Id: npp.h,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $
File: $File$
Revision: $Revision: 1.1.1.1 $
Last update: $Date: 2002-03-29 14:12:51 $
------------
This file contains the Non Preemptive Protocol (NPP)
Title:
NPP (Non Preemptive Protocol)
Resource Models Accepted:
None
Description:
This module implement the Non Preemptive Protocol.
When a task aquire a critical section, it become non-preemptable.
A NPP mutex is created passing the NPP_mutexattr structure to mutex_init.
Exceptions raised:
XMUTEX_OWNER_KILLED
This exception is raised when a task ends and it owns one or more
mutexes
Restrictions & special features:
- This module is NOT Posix compliant
- This module can manage any number of NPP mutexes.
- if a task uses a NPP mutex, it can use only this type of mutex.
- 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 error is returned
- A NPP 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 = <NPP resource level>; opt = NULL;
for example, if the NPP module is registered at level 1, the macro is
like:
#define MUTEX_INITIALIZER {1,(void *)NULL}
**/
/*
* 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
*
*/
#ifndef __NPP_H__
#define __NPP_H__
void NPP_register_module(void);
#endif