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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 |
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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 } |