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annotate src/thread/generic/SDL_sysmutex.c @ 3168:6338b7f2d024

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Hi, I have prepared a set of patches to readd WindowsCE support to SDL 1.3. I've created a new GAPI/Rawframebuffer and a DirectDraw renderer. Both renderers are work in progress and there are several unimplemented cases. (Notably RenderLine/RenderPoint/RenderFill/QueryTexturePixels/UpdateTexture and texture blending ) Nevertheless I am successfully using these renderers together with the SDL software renderer. (On most devices the SDL software renderer will be much faster as there are only badly optimized vendor drivers available) I send these patches now in this unpolished state because there seems to be some interest in win ce and someone has to start supporting SDL 1.3 Now on to the patches: wince_events_window_fixes.patch fixes some wince incompatibilities and adds fullscreen support via SHFullScreen. NOTE: This patch shouldn't have any side effects on Windows, but I have NOT tested it on Windows, so please double-check. This patch doesn't dependent on the following ones. wince_renderers_system.patch This patch does all necessary modifications to the SDL system. - it adds the renderers to the configure system - it adds the renderers to win32video SDL_ceddrawrender.c SDL_ceddrawrender.h SDL_gapirender_c.h SDL_gapirender.c SDL_gapirender.h these files add the new render drivers and should be placed in src/video/win32 Some notes to people who want to test this: - I have only compiled sdl with ming32ce, so the VisualC files are not up to date - As mingw32ce has no ddraw.h this file must be taken from the MS SDK and modified to work with gcc - I had to modify line 2611 in configure.in to EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lcoredll -lcommctrl -lmmtimer -Wl,--image-base -Wl,0x10000" otherwise GetCPinfo wouldn't link. If someone knows whats causing this I'd be happy to hear about it. It would be great if these patches could make their way into SVN as this would make collaboration much much easier. I'm out of office for the next week and therefore will be unavailable via email. Regards Stefan
author Sam Lantinga <slouken@libsdl.org>
date Sun, 07 Jun 2009 02:44:46 +0000 (2009-06-07)
parents 99210400e8b9
children 0d1b16ee0bca
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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
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30 struct SDL_mutex
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31 {
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32 int recursive;
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33 Uint32 owner;
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34 SDL_sem *sem;
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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 *
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39 SDL_CreateMutex(void)
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40 {
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41 SDL_mutex *mutex;
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42
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43 /* Allocate mutex memory */
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44 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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45 if (mutex) {
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46 /* Create the mutex semaphore, with initial value 1 */
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47 mutex->sem = SDL_CreateSemaphore(1);
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48 mutex->recursive = 0;
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49 mutex->owner = 0;
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50 if (!mutex->sem) {
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51 SDL_free(mutex);
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52 mutex = NULL;
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53 }
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54 } else {
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55 SDL_OutOfMemory();
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56 }
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57 return mutex;
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58 }
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59
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60 /* Free the mutex */
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61 void
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62 SDL_DestroyMutex(SDL_mutex * mutex)
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63 {
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64 if (mutex) {
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65 if (mutex->sem) {
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66 SDL_DestroySemaphore(mutex->sem);
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67 }
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68 SDL_free(mutex);
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69 }
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70 }
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71
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72 /* Lock the semaphore */
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73 int
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74 SDL_mutexP(SDL_mutex * mutex)
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75 {
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76 #if SDL_THREADS_DISABLED
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77 return 0;
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78 #else
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79 Uint32 this_thread;
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80
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81 if (mutex == NULL) {
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82 SDL_SetError("Passed a NULL mutex");
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83 return -1;
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84 }
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85
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86 this_thread = SDL_ThreadID();
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87 if (mutex->owner == this_thread) {
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88 ++mutex->recursive;
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89 } else {
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90 /* The order of operations is important.
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91 We set the locking thread id after we obtain the lock
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92 so unlocks from other threads will fail.
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93 */
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94 SDL_SemWait(mutex->sem);
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95 mutex->owner = this_thread;
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96 mutex->recursive = 0;
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97 }
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98
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99 return 0;
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100 #endif /* SDL_THREADS_DISABLED */
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101 }
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102
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103 /* Unlock the mutex */
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104 int
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105 SDL_mutexV(SDL_mutex * mutex)
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106 {
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107 #if SDL_THREADS_DISABLED
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108 return 0;
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109 #else
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110 if (mutex == NULL) {
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111 SDL_SetError("Passed a NULL mutex");
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112 return -1;
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113 }
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114
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115 /* If we don't own the mutex, we can't unlock it */
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116 if (SDL_ThreadID() != mutex->owner) {
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117 SDL_SetError("mutex not owned by this thread");
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118 return -1;
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119 }
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120
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121 if (mutex->recursive) {
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122 --mutex->recursive;
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123 } else {
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124 /* The order of operations is important.
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125 First reset the owner so another thread doesn't lock
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126 the mutex and set the ownership before we reset it,
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127 then release the lock semaphore.
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128 */
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129 mutex->owner = 0;
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130 SDL_SemPost(mutex->sem);
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131 }
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132 return 0;
1361
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133 #endif /* SDL_THREADS_DISABLED */
0
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134 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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135
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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136 /* vi: set ts=4 sw=4 expandtab: */