annotate src/thread/win32/SDL_sysmutex.c @ 1330:450721ad5436

It's now possible to build SDL without any C runtime at all on Windows, using Visual C++ 2005
author Sam Lantinga <slouken@libsdl.org>
date Mon, 06 Feb 2006 08:28:51 +0000
parents c9b51268668f
children 3692456e7b0f
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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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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Mutex functions using the Win32 API */
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24
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25 #include "SDL_windows.h"
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26
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27 #include "SDL_error.h"
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28 #include "SDL_mutex.h"
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29 #include "SDL_stdlib.h"
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31
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32 struct SDL_mutex {
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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 *SDL_CreateMutex(void)
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38 {
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39 SDL_mutex *mutex;
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40
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41 /* Allocate mutex memory */
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42 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
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43 if ( mutex ) {
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44 /* Create the mutex, with initial value signaled */
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45 mutex->id = CreateMutex(NULL, FALSE, NULL);
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46 if ( ! mutex->id ) {
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47 SDL_SetError("Couldn't create mutex");
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48 free(mutex);
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49 mutex = NULL;
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50 }
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51 } else {
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52 SDL_OutOfMemory();
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53 }
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54 return(mutex);
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55 }
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56
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57 /* Free the mutex */
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58 void SDL_DestroyMutex(SDL_mutex *mutex)
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59 {
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60 if ( mutex ) {
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61 if ( mutex->id ) {
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62 CloseHandle(mutex->id);
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63 mutex->id = 0;
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64 }
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65 free(mutex);
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66 }
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67 }
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68
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69 /* Lock the mutex */
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70 int SDL_mutexP(SDL_mutex *mutex)
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71 {
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72 if ( mutex == NULL ) {
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73 SDL_SetError("Passed a NULL mutex");
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74 return -1;
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75 }
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76 if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {
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77 SDL_SetError("Couldn't wait on mutex");
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78 return -1;
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79 }
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80 return(0);
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81 }
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82
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83 /* Unlock the mutex */
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84 int SDL_mutexV(SDL_mutex *mutex)
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85 {
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86 if ( mutex == NULL ) {
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87 SDL_SetError("Passed a NULL mutex");
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88 return -1;
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89 }
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90 if ( ReleaseMutex(mutex->id) == FALSE ) {
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91 SDL_SetError("Couldn't release mutex");
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92 return -1;
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93 }
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94 return(0);
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95 }