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| 2 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
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| 12 | * (see the web pages for full authors list) |
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| 13 | * |
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| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 15 | * |
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| 16 | * http://www.sssup.it |
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| 17 | * http://retis.sssup.it |
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| 18 | * http://shark.sssup.it |
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| 19 | */ |
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| 20 | |||
| 21 | |||
| 22 | /** |
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| 23 | ------------ |
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| 24 | CVS : $Id: npp.h,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $ |
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| 25 | |||
| 26 | File: $File$ |
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| 27 | Revision: $Revision: 1.1.1.1 $ |
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| 28 | Last update: $Date: 2002-03-29 14:12:51 $ |
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| 29 | ------------ |
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| 30 | |||
| 31 | This file contains the Non Preemptive Protocol (NPP) |
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| 32 | |||
| 33 | Title: |
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| 34 | NPP (Non Preemptive Protocol) |
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| 35 | |||
| 36 | Resource Models Accepted: |
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| 37 | None |
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| 38 | |||
| 39 | Description: |
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| 40 | This module implement the Non Preemptive Protocol. |
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| 41 | When a task aquire a critical section, it become non-preemptable. |
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| 42 | |||
| 43 | A NPP mutex is created passing the NPP_mutexattr structure to mutex_init. |
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| 44 | |||
| 45 | Exceptions raised: |
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| 46 | XMUTEX_OWNER_KILLED |
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| 47 | This exception is raised when a task ends and it owns one or more |
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| 48 | mutexes |
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| 49 | |||
| 50 | Restrictions & special features: |
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| 51 | - This module is NOT Posix compliant |
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| 52 | - This module can manage any number of NPP mutexes. |
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| 53 | - if a task uses a NPP mutex, it can use only this type of mutex. |
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| 54 | - If a task ends (because it reaches the end of the body or because it |
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| 55 | is killed by someone) and it owns some mutex, an exception is raised. |
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| 56 | - if a mutex unlock is called on a mutex not previously |
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| 57 | locked or previously locked by another task an error is returned |
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| 58 | - A NPP mutex can be statically allocated. To do this, the init function |
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| 59 | have to define a macro that puts this information in the mutex |
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| 60 | descriptor: mutexlevel = <NPP resource level>; opt = NULL; |
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| 61 | for example, if the NPP module is registered at level 1, the macro is |
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| 62 | like: |
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| 63 | #define MUTEX_INITIALIZER {1,(void *)NULL} |
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| 64 | |||
| 65 | **/ |
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| 66 | |||
| 67 | /* |
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| 68 | * Copyright (C) 2000 Paolo Gai |
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| 69 | * |
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| 70 | * This program is free software; you can redistribute it and/or modify |
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| 71 | * it under the terms of the GNU General Public License as published by |
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| 72 | * the Free Software Foundation; either version 2 of the License, or |
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| 73 | * (at your option) any later version. |
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| 74 | * |
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| 75 | * This program is distributed in the hope that it will be useful, |
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| 76 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 77 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 78 | * GNU General Public License for more details. |
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| 79 | * |
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| 80 | * You should have received a copy of the GNU General Public License |
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| 81 | * along with this program; if not, write to the Free Software |
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| 82 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 83 | * |
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| 84 | */ |
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| 85 | |||
| 86 | |||
| 87 | |||
| 88 | #ifndef __NPP_H__ |
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| 89 | #define __NPP_H__ |
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| 90 | |||
| 91 | void NPP_register_module(void); |
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| 92 | |||
| 93 | #endif |