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annotate src/thread/generic/SDL_syscond.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 f7b03b6838cb
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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 condition variables using semaphores and mutexes */
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25 /*
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26 This implementation borrows heavily from the BeOS condition variable
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27 implementation, written by Christopher Tate and Owen Smith. Thanks!
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28 */
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29
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30 #include "SDL_thread.h"
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31
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32 struct SDL_cond
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33 {
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34 SDL_mutex *lock;
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35 int waiting;
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36 int signals;
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37 SDL_sem *wait_sem;
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38 SDL_sem *wait_done;
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39 };
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40
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41 /* Create a condition variable */
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42 SDL_cond *
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43 SDL_CreateCond(void)
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44 {
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45 SDL_cond *cond;
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46
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47 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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48 if (cond) {
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49 cond->lock = SDL_CreateMutex();
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50 cond->wait_sem = SDL_CreateSemaphore(0);
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51 cond->wait_done = SDL_CreateSemaphore(0);
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52 cond->waiting = cond->signals = 0;
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53 if (!cond->lock || !cond->wait_sem || !cond->wait_done) {
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54 SDL_DestroyCond(cond);
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55 cond = NULL;
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56 }
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57 } else {
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58 SDL_OutOfMemory();
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59 }
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60 return (cond);
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61 }
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62
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63 /* Destroy a condition variable */
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64 void
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65 SDL_DestroyCond(SDL_cond * cond)
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66 {
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67 if (cond) {
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68 if (cond->wait_sem) {
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69 SDL_DestroySemaphore(cond->wait_sem);
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70 }
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71 if (cond->wait_done) {
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72 SDL_DestroySemaphore(cond->wait_done);
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73 }
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74 if (cond->lock) {
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75 SDL_DestroyMutex(cond->lock);
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76 }
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77 SDL_free(cond);
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78 }
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79 }
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80
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81 /* Restart one of the threads that are waiting on the condition variable */
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82 int
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83 SDL_CondSignal(SDL_cond * cond)
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84 {
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85 if (!cond) {
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86 SDL_SetError("Passed a NULL condition variable");
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87 return -1;
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88 }
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89
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90 /* If there are waiting threads not already signalled, then
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91 signal the condition and wait for the thread to respond.
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92 */
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93 SDL_LockMutex(cond->lock);
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94 if (cond->waiting > cond->signals) {
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95 ++cond->signals;
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96 SDL_SemPost(cond->wait_sem);
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97 SDL_UnlockMutex(cond->lock);
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98 SDL_SemWait(cond->wait_done);
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99 } else {
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100 SDL_UnlockMutex(cond->lock);
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101 }
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102
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103 return 0;
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104 }
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105
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106 /* Restart all threads that are waiting on the condition variable */
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107 int
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108 SDL_CondBroadcast(SDL_cond * cond)
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109 {
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110 if (!cond) {
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111 SDL_SetError("Passed a NULL condition variable");
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112 return -1;
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113 }
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114
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115 /* If there are waiting threads not already signalled, then
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116 signal the condition and wait for the thread to respond.
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117 */
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118 SDL_LockMutex(cond->lock);
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119 if (cond->waiting > cond->signals) {
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120 int i, num_waiting;
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121
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122 num_waiting = (cond->waiting - cond->signals);
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123 cond->signals = cond->waiting;
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124 for (i = 0; i < num_waiting; ++i) {
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125 SDL_SemPost(cond->wait_sem);
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126 }
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127 /* Now all released threads are blocked here, waiting for us.
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128 Collect them all (and win fabulous prizes!) :-)
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129 */
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130 SDL_UnlockMutex(cond->lock);
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131 for (i = 0; i < num_waiting; ++i) {
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132 SDL_SemWait(cond->wait_done);
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133 }
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134 } else {
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135 SDL_UnlockMutex(cond->lock);
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136 }
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137
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138 return 0;
0
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139 }
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140
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141 /* Wait on the condition variable for at most 'ms' milliseconds.
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142 The mutex must be locked before entering this function!
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143 The mutex is unlocked during the wait, and locked again after the wait.
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144
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145 Typical use:
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146
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147 Thread A:
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148 SDL_LockMutex(lock);
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149 while ( ! condition ) {
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150 SDL_CondWait(cond);
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151 }
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152 SDL_UnlockMutex(lock);
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153
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154 Thread B:
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155 SDL_LockMutex(lock);
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156 ...
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157 condition = true;
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158 ...
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159 SDL_UnlockMutex(lock);
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160 */
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161 int
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162 SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms)
0
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163 {
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164 int retval;
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165
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166 if (!cond) {
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167 SDL_SetError("Passed a NULL condition variable");
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168 return -1;
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169 }
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170
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171 /* Obtain the protection mutex, and increment the number of waiters.
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172 This allows the signal mechanism to only perform a signal if there
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173 are waiting threads.
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174 */
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175 SDL_LockMutex(cond->lock);
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176 ++cond->waiting;
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177 SDL_UnlockMutex(cond->lock);
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178
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179 /* Unlock the mutex, as is required by condition variable semantics */
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180 SDL_UnlockMutex(mutex);
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181
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182 /* Wait for a signal */
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183 if (ms == SDL_MUTEX_MAXWAIT) {
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184 retval = SDL_SemWait(cond->wait_sem);
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185 } else {
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186 retval = SDL_SemWaitTimeout(cond->wait_sem, ms);
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187 }
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188
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189 /* Let the signaler know we have completed the wait, otherwise
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190 the signaler can race ahead and get the condition semaphore
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191 if we are stopped between the mutex unlock and semaphore wait,
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192 giving a deadlock. See the following URL for details:
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193 http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html
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194 */
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195 SDL_LockMutex(cond->lock);
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196 if (cond->signals > 0) {
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197 /* If we timed out, we need to eat a condition signal */
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198 if (retval > 0) {
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199 SDL_SemWait(cond->wait_sem);
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200 }
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201 /* We always notify the signal thread that we are done */
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202 SDL_SemPost(cond->wait_done);
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203
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204 /* Signal handshake complete */
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205 --cond->signals;
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206 }
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207 --cond->waiting;
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208 SDL_UnlockMutex(cond->lock);
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209
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210 /* Lock the mutex, as is required by condition variable semantics */
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211 SDL_LockMutex(mutex);
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212
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213 return retval;
0
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214 }
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215
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216 /* Wait on the condition variable forever */
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217 int
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218 SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
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219 {
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220 return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT);
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221 }
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222
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223 /* vi: set ts=4 sw=4 expandtab: */