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annotate src/thread/windows/SDL_sysmutex.c @ 5187:d976b67150c5

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Restored SDL_BLENDMODE_MOD for MAME
author Sam Lantinga <slouken@libsdl.org>
date Fri, 04 Feb 2011 19:50:56 -0800
parents 327f181542f1
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 /* Mutex functions using the Win32 API */
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25
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26 #include "../../core/windows/SDL_windows.h"
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27
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28 #include "SDL_mutex.h"
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29
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30
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31 struct SDL_mutex
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32 {
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33 HANDLE id;
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34 };
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35
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36 /* Create a mutex */
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37 SDL_mutex *
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38 SDL_CreateMutex(void)
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39 {
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40 SDL_mutex *mutex;
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41
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42 /* Allocate mutex memory */
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43 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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44 if (mutex) {
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45 /* Create the mutex, with initial value signaled */
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46 mutex->id = CreateMutex(NULL, FALSE, NULL);
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47 if (!mutex->id) {
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48 SDL_SetError("Couldn't create mutex");
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49 SDL_free(mutex);
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50 mutex = NULL;
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51 }
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52 } else {
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53 SDL_OutOfMemory();
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54 }
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55 return (mutex);
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56 }
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57
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58 /* Free the mutex */
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59 void
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60 SDL_DestroyMutex(SDL_mutex * mutex)
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61 {
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62 if (mutex) {
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63 if (mutex->id) {
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64 CloseHandle(mutex->id);
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65 mutex->id = 0;
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66 }
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67 SDL_free(mutex);
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68 }
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69 }
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70
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71 /* Lock the mutex */
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72 int
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73 SDL_mutexP(SDL_mutex * mutex)
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74 {
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75 if (mutex == NULL) {
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76 SDL_SetError("Passed a NULL mutex");
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77 return -1;
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78 }
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79 if (WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED) {
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80 SDL_SetError("Couldn't wait on mutex");
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81 return -1;
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82 }
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83 return (0);
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84 }
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85
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86 /* Unlock the mutex */
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87 int
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88 SDL_mutexV(SDL_mutex * mutex)
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89 {
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90 if (mutex == NULL) {
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91 SDL_SetError("Passed a NULL mutex");
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92 return -1;
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93 }
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94 if (ReleaseMutex(mutex->id) == FALSE) {
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95 SDL_SetError("Couldn't release mutex");
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96 return -1;
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97 }
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98 return (0);
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99 }
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100
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101 /* vi: set ts=4 sw=4 expandtab: */