Mercurial > sdl-ios-xcode
annotate src/thread/dc/SDL_syssem.c @ 1585:980d2a0dc2a3
Date: Tue, 4 Mar 2003 15:05:31 -0800
From: "Jim"
Subject: [SDL] Frame Buffer patches...
Okay I'm new at patch generation - so please tell me if there's a better way
I could have done this.
Attached are two patch files generated with 'cvs diff -u'
SDL-fb-open-lock.patch applies to SDL_fbvideo.c
Modifies the open loop to check /dev/fb/0 found on devfs...
Modifies the lock code to return failure if the current virtual terminal
is not the one opened for frame buffer writing...
Lock would hang forever if switched away (ctrl-alt-F1) ...
SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c
Switches default mouse mode based on SDL_MOUSEDRV - currently only
accepts PS2 - otherwise default is MS Mouse.
When the screen is switched - exisiting code (wrapped in ifdef
SAVE_SCREEN_COTENTS) would save the wrong bit of the screen....
( I run frame buffer 1600x1200, the size I requested was 800x600 - the
save would save the top 800 lines (non biased) and restore them... Adding
screen->offset fixed that )
However, if that option is not set, then a call to SDL_UpdateRect (full
screen) is made. (which may have had it's contents changed since the screen
is not entirely locked because of lock-failure patch)
Jim
[patches slightly tweaked for SDL 1.2.10]
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 22 Mar 2006 07:48:22 +0000 |
parents | d910939febfa |
children | 782fd950bd46 536b0704b7d8 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 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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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 semaphores using mutexes and condition variables */ |
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25 |
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26 #include "SDL_timer.h" |
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27 #include "SDL_thread.h" |
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28 #include "SDL_systhread_c.h" |
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29 |
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30 |
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31 #if SDL_THREADS_DISABLED |
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32 |
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33 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) |
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34 { |
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35 SDL_SetError("SDL not configured with thread support"); |
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36 return (SDL_sem *)0; |
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37 } |
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38 |
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39 void SDL_DestroySemaphore(SDL_sem *sem) |
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40 { |
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41 return; |
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42 } |
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43 |
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44 int SDL_SemTryWait(SDL_sem *sem) |
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45 { |
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46 SDL_SetError("SDL not configured with thread support"); |
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47 return -1; |
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48 } |
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49 |
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50 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) |
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51 { |
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52 SDL_SetError("SDL not configured with thread support"); |
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53 return -1; |
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54 } |
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55 |
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56 int SDL_SemWait(SDL_sem *sem) |
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57 { |
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58 SDL_SetError("SDL not configured with thread support"); |
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59 return -1; |
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60 } |
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61 |
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62 Uint32 SDL_SemValue(SDL_sem *sem) |
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63 { |
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64 return 0; |
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65 } |
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66 |
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67 int SDL_SemPost(SDL_sem *sem) |
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68 { |
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69 SDL_SetError("SDL not configured with thread support"); |
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70 return -1; |
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71 } |
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72 |
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73 #else |
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74 |
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75 #include <kos/sem.h> |
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76 |
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77 struct SDL_semaphore |
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78 { |
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79 semaphore_t sem; |
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80 }; |
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81 |
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82 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) |
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83 { |
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84 return (SDL_sem *)sem_create(initial_value); |
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85 } |
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86 |
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87 /* WARNING: |
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88 You cannot call this function when another thread is using the semaphore. |
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89 */ |
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90 void SDL_DestroySemaphore(SDL_sem *sem) |
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91 { |
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92 if ( ! sem ) { |
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93 SDL_SetError("Passed a NULL semaphore"); |
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94 return; |
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95 } |
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96 |
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97 sem_destroy(&sem->sem); |
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98 } |
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99 |
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100 int SDL_SemTryWait(SDL_sem *sem) |
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101 { |
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102 int retval; |
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103 |
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104 if ( ! sem ) { |
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105 SDL_SetError("Passed a NULL semaphore"); |
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106 return -1; |
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107 } |
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108 |
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109 retval = sem_trywait(&sem->sem); |
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110 if (retval==0) return 0; |
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111 else return SDL_MUTEX_TIMEDOUT; |
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112 |
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113 return retval; |
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114 } |
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115 |
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116 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) |
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117 { |
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118 int retval; |
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119 |
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120 if ( ! sem ) { |
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121 SDL_SetError("Passed a NULL semaphore"); |
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122 return -1; |
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123 } |
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124 |
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125 /* A timeout of 0 is an easy case */ |
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126 if ( timeout == 0 ) { |
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127 return SDL_SemTryWait(sem); |
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128 } |
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129 |
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130 retval = sem_wait_timed(&sem->sem,timeout); |
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131 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT; |
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132 |
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133 return retval; |
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134 } |
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135 |
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136 int SDL_SemWait(SDL_sem *sem) |
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137 { |
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138 if ( ! sem ) { |
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139 SDL_SetError("Passed a NULL semaphore"); |
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140 return -1; |
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141 } |
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142 |
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143 sem_wait(&sem->sem); |
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144 return 0; |
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145 } |
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146 |
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147 Uint32 SDL_SemValue(SDL_sem *sem) |
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148 { |
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149 if ( ! sem ) { |
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150 SDL_SetError("Passed a NULL semaphore"); |
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151 return -1; |
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152 } |
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153 |
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154 return sem_count(&sem->sem); |
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155 } |
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156 |
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157 int SDL_SemPost(SDL_sem *sem) |
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158 { |
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159 if ( ! sem ) { |
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160 SDL_SetError("Passed a NULL semaphore"); |
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161 return -1; |
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162 } |
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163 |
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164 sem_signal(&sem->sem); |
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165 return 0; |
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166 } |
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167 |
1361
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168 #endif /* SDL_THREADS_DISABLED */ |