Rev 961 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 961 | 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 | ------------ |
||
| 24 | CVS : $Id: npp.h,v 1.1 2005-02-25 10:45:36 pj Exp $ |
||
| 25 | |||
| 26 | File: $File$ |
||
| 27 | Revision: $Revision: 1.1 $ |
||
| 28 | Last update: $Date: 2005-02-25 10:45:36 $ |
||
| 29 | ------------ |
||
| 30 | |||
| 31 | This file contains the Non Preemptive Protocol (NPP) |
||
| 32 | |||
| 33 | Title: |
||
| 34 | NPP (Non Preemptive Protocol) |
||
| 35 | |||
| 36 | Resource Models Accepted: |
||
| 37 | None |
||
| 38 | |||
| 39 | Description: |
||
| 40 | This module implement the Non Preemptive Protocol. |
||
| 41 | When a task aquire a critical section, it become non-preemptable. |
||
| 42 | |||
| 43 | A NPP mutex is created passing the NPP_mutexattr structure to mutex_init. |
||
| 44 | |||
| 45 | Exceptions raised: |
||
| 46 | XMUTEX_OWNER_KILLED |
||
| 47 | This exception is raised when a task ends and it owns one or more |
||
| 48 | mutexes |
||
| 49 | |||
| 50 | Restrictions & special features: |
||
| 51 | - This module is NOT Posix compliant |
||
| 52 | - This module can manage any number of NPP mutexes. |
||
| 53 | - if a task uses a NPP mutex, it can use only this type of mutex. |
||
| 54 | - If a task ends (because it reaches the end of the body or because it |
||
| 55 | is killed by someone) and it owns some mutex, an exception is raised. |
||
| 56 | - if a mutex unlock is called on a mutex not previously |
||
| 57 | locked or previously locked by another task an error is returned |
||
| 58 | - A NPP mutex can be statically allocated. To do this, the init function |
||
| 59 | have to define a macro that puts this information in the mutex |
||
| 60 | descriptor: mutexlevel = <NPP resource level>; opt = NULL; |
||
| 61 | for example, if the NPP module is registered at level 1, the macro is |
||
| 62 | like: |
||
| 63 | #define MUTEX_INITIALIZER {1,(void *)NULL} |
||
| 64 | |||
| 65 | **/ |
||
| 66 | |||
| 67 | /* |
||
| 68 | * Copyright (C) 2000 Paolo Gai |
||
| 69 | * |
||
| 70 | * This program is free software; you can redistribute it and/or modify |
||
| 71 | * it under the terms of the GNU General Public License as published by |
||
| 72 | * the Free Software Foundation; either version 2 of the License, or |
||
| 73 | * (at your option) any later version. |
||
| 74 | * |
||
| 75 | * This program is distributed in the hope that it will be useful, |
||
| 76 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 77 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||
| 78 | * GNU General Public License for more details. |
||
| 79 | * |
||
| 80 | * You should have received a copy of the GNU General Public License |
||
| 81 | * along with this program; if not, write to the Free Software |
||
| 82 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
||
| 83 | * |
||
| 84 | */ |
||
| 85 | |||
| 86 | |||
| 87 | |||
| 88 | #ifndef __NPP_H__ |
||
| 89 | #define __NPP_H__ |
||
| 90 | |||
| 91 | #include "ll/sys/cdefs.h" |
||
| 92 | |||
| 93 | __BEGIN_DECLS |
||
| 94 | |||
| 95 | void NPP_register_module(void); |
||
| 96 | |||
| 97 | __END_DECLS |
||
| 98 | #endif |