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annotate src/thread/pth/SDL_sysmutex.c @ 3300:34a4a01da79c

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Possibly fixed bug #601, definitely fixed a potential issue with threads stopping and starting in rapid succession.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 23 Sep 2009 06:37:27 +0000
parents 99210400e8b9
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 * GNU pth mutexes
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26 *
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27 * Patrice Mandin
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28 */
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29
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30 #include <pth.h>
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31
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32 #include "SDL_mutex.h"
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33 #include "SDL_sysmutex_c.h"
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34
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35 /* Create a mutex */
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36 SDL_mutex *
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37 SDL_CreateMutex(void)
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38 {
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39 SDL_mutex *mutex;
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40
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41 /* Allocate mutex memory */
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42 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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43 if (mutex) {
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44 /* Create the mutex, with initial value signaled */
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45 if (!pth_mutex_init(&(mutex->mutexpth_p))) {
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46 SDL_SetError("Couldn't create mutex");
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47 SDL_free(mutex);
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48 mutex = NULL;
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49 }
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50 } else {
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51 SDL_OutOfMemory();
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52 }
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53 return (mutex);
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54 }
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55
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56 /* Free the mutex */
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57 void
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58 SDL_DestroyMutex(SDL_mutex * mutex)
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59 {
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60 if (mutex) {
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61 SDL_free(mutex);
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62 }
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63 }
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64
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65 /* Lock the mutex */
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66 int
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67 SDL_mutexP(SDL_mutex * mutex)
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68 {
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69 if (mutex == NULL) {
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70 SDL_SetError("Passed a NULL mutex");
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71 return -1;
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72 }
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73
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74 pth_mutex_acquire(&(mutex->mutexpth_p), FALSE, NULL);
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75
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76 return (0);
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77 }
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78
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79 /* Unlock the mutex */
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80 int
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81 SDL_mutexV(SDL_mutex * mutex)
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82 {
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83 if (mutex == NULL) {
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84 SDL_SetError("Passed a NULL mutex");
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85 return -1;
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86 }
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87
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88 pth_mutex_release(&(mutex->mutexpth_p));
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89
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90 return (0);
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91 }
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92
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93 /* vi: set ts=4 sw=4 expandtab: */