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| 961 | 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: pi.h,v 1.1 2005-02-25 10:55:09 pj Exp $ |
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| 25 | |||
| 26 | File: $File$ |
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| 27 | Revision: $Revision: 1.1 $ |
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| 28 | Last update: $Date: 2005-02-25 10:55:09 $ |
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| 29 | ------------ |
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| 30 | |||
| 31 | This file contains the Priority Inheritance (PI) Protocol |
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| 32 | |||
| 33 | Title: |
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| 34 | PI (Priority Inheritance 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 Priority Inheritance Protocol. |
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| 41 | The priority inheritance is made using the shadow field of the |
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| 42 | task descriptor. No difference is made upon the task model of the |
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| 43 | tasks that use PI mutexes. |
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| 44 | |||
| 45 | A PI mutex is created passing the PI_mutexattr structure to mutex_init. |
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| 46 | |||
| 47 | Exceptions raised: |
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| 48 | XMUTEX_OWNER_KILLED |
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| 49 | This exception is raised when a task ends and it owns one or more |
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| 50 | mutexes |
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| 51 | |||
| 52 | Restrictions & special features: |
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| 53 | - This module is NOT Posix compliant |
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| 54 | - This module can manage any number of PI mutexes. |
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| 55 | - If a task ends (because it reaches the end of the body or because it |
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| 56 | is killed by someone) and it owns some mutex, an exception is raised. |
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| 57 | - if a mutex unlock is called on a mutex not previously |
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| 58 | locked or previously locked by another task an exception is raised |
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| 59 | - A PI mutex can be statically allocated. To do this, the init function |
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| 60 | have to define a macro that puts this information in the mutex |
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| 61 | descriptor: mutexlevel = <PI resource level>; opt = NULL; |
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| 62 | for example, if the PI module is registered at level 1, the macro is |
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| 63 | like: |
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| 64 | #define MUTEX_INITIALIZER {1,NULL} |
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| 65 | |||
| 66 | **/ |
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| 67 | |||
| 68 | /* |
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| 69 | * Copyright (C) 2000 Paolo Gai |
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| 70 | * |
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| 71 | * This program is free software; you can redistribute it and/or modify |
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| 72 | * it under the terms of the GNU General Public License as published by |
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| 73 | * the Free Software Foundation; either version 2 of the License, or |
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| 74 | * (at your option) any later version. |
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| 75 | * |
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| 76 | * This program is distributed in the hope that it will be useful, |
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| 77 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 78 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 79 | * GNU General Public License for more details. |
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| 80 | * |
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| 81 | * You should have received a copy of the GNU General Public License |
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| 82 | * along with this program; if not, write to the Free Software |
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| 83 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 84 | * |
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| 85 | */ |
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| 86 | |||
| 87 | |||
| 88 | |||
| 89 | #ifndef __PI_H__ |
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| 90 | #define __PI_H__ |
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| 91 | |||
| 92 | #include <kernel/types.h> |
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| 93 | #include "ll/sys/cdefs.h" |
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| 94 | |||
| 95 | __BEGIN_DECLS |
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| 96 | |||
| 97 | RLEVEL PI_register_module(void); |
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| 98 | |||
| 99 | __END_DECLS |
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| 100 | #endif |