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annotate src/thread/windows/SDL_sysmutex.c @ 5282:8e421890cdb8

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Fixed bug #1117 There's a new event that's always sent when the window changes size, and that event is what the renderers listen for to determine if they need to rebind their context.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 19:02:14 -0800
parents b530ef003506
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2011 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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327f181542f1 Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share.
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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: */