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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Mutex functions using the Win32 API */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <windows.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_mutex.h"
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36
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37
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38 struct SDL_mutex {
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39 HANDLE id;
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40 };
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41
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42 /* Create a mutex */
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43 SDL_mutex *SDL_CreateMutex(void)
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44 {
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45 SDL_mutex *mutex;
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46
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47 /* Allocate mutex memory */
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48 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
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49 if ( mutex ) {
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50 /* Create the mutex, with initial value signaled */
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51 mutex->id = CreateMutex(NULL, FALSE, NULL);
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52 if ( ! mutex->id ) {
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53 SDL_SetError("Couldn't create mutex");
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54 free(mutex);
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55 mutex = NULL;
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56 }
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57 } else {
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58 SDL_OutOfMemory();
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59 }
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60 return(mutex);
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61 }
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62
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63 /* Free the mutex */
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64 void SDL_DestroyMutex(SDL_mutex *mutex)
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65 {
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66 if ( mutex ) {
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67 if ( mutex->id ) {
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68 CloseHandle(mutex->id);
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69 mutex->id = 0;
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70 }
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71 free(mutex);
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72 }
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73 }
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74
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75 /* Lock the mutex */
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76 int SDL_mutexP(SDL_mutex *mutex)
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77 {
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78 if ( mutex == NULL ) {
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79 SDL_SetError("Passed a NULL mutex");
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80 return -1;
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81 }
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82 if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {
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83 SDL_SetError("Couldn't wait on mutex");
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84 return -1;
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85 }
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86 return(0);
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87 }
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88
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89 /* Unlock the mutex */
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90 int SDL_mutexV(SDL_mutex *mutex)
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91 {
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92 if ( mutex == NULL ) {
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93 SDL_SetError("Passed a NULL mutex");
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94 return -1;
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95 }
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96 if ( ReleaseMutex(mutex->id) == FALSE ) {
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97 SDL_SetError("Couldn't release mutex");
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98 return -1;
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99 }
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100 return(0);
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101 }
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