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2 | pj | 1 | /* |
2 | * Project: HARTIK (HA-rd R-eal TI-me K-ernel) |
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3 | * |
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4 | * Coordinators: Giorgio Buttazzo <giorgio@sssup.it> |
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5 | * Gerardo Lamastra <gerardo@sssup.it> |
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6 | * |
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7 | * Authors : Massimiliano Giorgi <massy@hartik.sssup.it> |
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8 | * (see authors.txt for full list of hartik's authors) |
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9 | * |
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10 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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11 | * |
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12 | * http://www.sssup.it |
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13 | * http://retis.sssup.it |
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14 | * http://hartik.sssup.it |
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15 | */ |
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16 | |||
17 | /* |
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18 | * Copyright (C) 1999 Massimiliano Giorgi |
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19 | * |
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20 | * This program is free software; you can redistribute it and/or modify |
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21 | * it under the terms of the GNU General Public License as published by |
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22 | * the Free Software Foundation; either version 2 of the License, or |
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23 | * (at your option) any later version. |
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24 | * |
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25 | * This program is distributed in the hope that it will be useful, |
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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28 | * GNU General Public License for more details. |
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29 | * |
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30 | * You should have received a copy of the GNU General Public License |
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31 | * along with this program; if not, write to the Free Software |
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32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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33 | * |
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34 | */ |
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35 | |||
36 | /* |
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37 | * CVS : $Id: rwlock.h,v 1.1.1.1 2002-03-29 14:12:50 pj Exp $ |
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38 | * |
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39 | * File: $File$ |
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40 | * Revision: $Revision: 1.1.1.1 $ |
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41 | * Last update: $Date: 2002-03-29 14:12:50 $ |
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42 | */ |
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43 | |||
44 | /**** |
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45 | This file contains the prototypes of an implementation of a reader/writer's protocol. |
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46 | ****/ |
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47 | |||
48 | #ifndef __RWLOCK_H |
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49 | #define __RWLOCK_H |
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50 | |||
51 | #include <fs/mutex.h> |
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52 | #include <fs/semaph.h> |
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53 | |||
54 | typedef struct { |
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55 | __mutex_t mutex; |
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56 | int active_readers; |
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57 | int active_writers; |
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58 | int blocked_readers; |
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59 | int blocked_writers; |
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60 | __sem_t readers_semaph; |
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61 | __sem_t writers_semaph; |
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62 | } __rwlock_t; |
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63 | |||
64 | void __rwlock_init(__rwlock_t *ptr); |
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65 | void __rwlock_rdlock(__rwlock_t *ptr); |
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66 | void __rwlock_wrlock(__rwlock_t *ptr); |
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67 | int __rwlock_tryrdlock(__rwlock_t *ptr); |
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68 | int __rwlock_trywrlock(__rwlock_t *ptr); |
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69 | void __rwlock_rdunlock(__rwlock_t *ptr); |
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70 | void __rwlock_wrunlock(__rwlock_t *ptr); |
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71 | |||
72 | #endif |