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annotate src/thread/pth/SDL_sysmutex.c @ 3941:2409c20399c1 SDL-1.2

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GEM has a window manager, of course
author Patrice Mandin <patmandin@gmail.com>
date Sat, 26 May 2007 19:44:37 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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
329
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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 *SDL_CreateMutex(void)
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37 {
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38 SDL_mutex *mutex;
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39
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40 /* Allocate mutex memory */
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41 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
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42 if ( mutex ) {
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43 /* Create the mutex, with initial value signaled */
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44 if (!pth_mutex_init(&(mutex->mutexpth_p))) {
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45 SDL_SetError("Couldn't create mutex");
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46 SDL_free(mutex);
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47 mutex = NULL;
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48 }
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49 } else {
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50 SDL_OutOfMemory();
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51 }
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52 return(mutex);
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53 }
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54
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55 /* Free the mutex */
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56 void SDL_DestroyMutex(SDL_mutex *mutex)
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57 {
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58 if ( mutex ) {
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59 SDL_free(mutex);
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60 }
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61 }
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62
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63 /* Lock the mutex */
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64 int SDL_mutexP(SDL_mutex *mutex)
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65 {
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66 if ( mutex == NULL ) {
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67 SDL_SetError("Passed a NULL mutex");
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68 return -1;
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69 }
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70
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71 pth_mutex_acquire(&(mutex->mutexpth_p), FALSE, NULL);
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72
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73 return(0);
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74 }
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75
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76 /* Unlock the mutex */
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77 int SDL_mutexV(SDL_mutex *mutex)
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78 {
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79 if ( mutex == NULL ) {
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80 SDL_SetError("Passed a NULL mutex");
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81 return -1;
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82 }
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83
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84 pth_mutex_release(&(mutex->mutexpth_p));
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85
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86 return(0);
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87 }