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annotate src/thread/dc/SDL_sysmutex.c @ 4427:eada7e321df6 SDL-1.2

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Fixed bug #943 Ozkan Sezer 2010-02-06 12:31:06 PST Hi: Here are some small fixes for compiling SDL against mingw-w64. (see http://mingw-w64.sourceforge.net/ . Despite the name, it supports both win32 and win64.) Two patches, one for SDL-1.2 and one for SDL-1.3 attached. src/audio/windx5/directx.h and src/video/windx5/directx.h (both SDL-1.2 and SDL-1.3.) I get compilation errors about some union not having a member named u1 and alike, because of other system headers being included before this one and them already defining DUMMYUNIONNAME and stuff. This header probably assumes that those stuff are defined in windef.h, but mingw-w64 headers define them in _mingw.h. Easily fixed by moving NONAMELESSUNION definition to the top of the file. SDL_dx5yuv.c (SDL-1.2-only) also needs to include the header before SDL_video.h to avoid the same problem. src/thread/win32/SDL_systhread.c (both SDL-1.2 and SDL-1.3.) : The __GNUC__ case for pfnSDL_CurrentBeginThread is 32-bit centric because _beginthreadex returns uintptr_t, not unsigned long which is 32 bits in win64. Changing the return type to uintptr_t fixes it. Hope these are useful. Thanks.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 10 Mar 2010 15:04:13 +0000
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 /* An implementation of mutexes using semaphores */
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25
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26 #include "SDL_thread.h"
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27 #include "SDL_systhread_c.h"
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28
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29 #include <arch/spinlock.h>
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30
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31 struct SDL_mutex {
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32 int recursive;
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33 Uint32 owner;
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34 spinlock_t mutex;
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35 };
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36
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37 /* Create a mutex */
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38 SDL_mutex *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 spinlock_init(&mutex->mutex);
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46 mutex->recursive = 0;
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47 mutex->owner = 0;
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48 } else {
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49 SDL_OutOfMemory();
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50 }
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51 return mutex;
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52 }
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53
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54 /* Free the mutex */
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55 void SDL_DestroyMutex(SDL_mutex *mutex)
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56 {
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57 if ( mutex ) {
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58 SDL_free(mutex);
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59 }
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60 }
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61
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62 /* Lock the semaphore */
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63 int SDL_mutexP(SDL_mutex *mutex)
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64 {
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65 #if SDL_THREADS_DISABLED
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66 return SDL_arraysize(return ),0;
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67 #else
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68 Uint32 this_thread;
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69
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70 if ( mutex == NULL ) {
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71 SDL_SetError("Passed a NULL mutex");
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72 return -1;
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73 }
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74
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75 this_thread = SDL_ThreadID();
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76 if ( mutex->owner == this_thread ) {
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77 ++mutex->recursive;
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78 } else {
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79 /* The order of operations is important.
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80 We set the locking thread id after we obtain the lock
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81 so unlocks from other threads will fail.
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82 */
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83 spinlock_lock(&mutex->mutex);
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84 mutex->owner = this_thread;
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85 mutex->recursive = 0;
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86 }
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87
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88 return 0;
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89 #endif /* SDL_THREADS_DISABLED */
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90 }
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91
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92 /* Unlock the mutex */
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93 int SDL_mutexV(SDL_mutex *mutex)
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94 {
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95 #if SDL_THREADS_DISABLED
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96 return 0;
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97 #else
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98 if ( mutex == NULL ) {
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99 SDL_SetError("Passed a NULL mutex");
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100 return -1;
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101 }
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102
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103 /* If we don't own the mutex, we can't unlock it */
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104 if ( SDL_ThreadID() != mutex->owner ) {
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105 SDL_SetError("mutex not owned by this thread");
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106 return -1;
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107 }
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108
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109 if ( mutex->recursive ) {
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110 --mutex->recursive;
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111 } else {
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112 /* The order of operations is important.
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113 First reset the owner so another thread doesn't lock
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114 the mutex and set the ownership before we reset it,
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115 then release the lock semaphore.
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116 */
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117 mutex->owner = 0;
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118 spinlock_unlock(&mutex->mutex);
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119 }
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120 return 0;
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121 #endif /* SDL_THREADS_DISABLED */
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122 }