Mercurial > sdl-ios-xcode
annotate src/timer/riscos/SDL_systimer.c @ 1228:f4a3a4129d04
From Mike Frysinger and/or Gentoo:
- libsdl-SDL_stretch-PIC.patch
ignoring the general fact of how SDL_stretch relies on executing dynamic code,
the inline asm should let gcc handle the a details for getting the actual
address for _copy_row as it will do the right thing
test case: http://dev.gentoo.org/~vapier/libsdl/sdl-stretch.tar.bz2
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Thu, 05 Jan 2006 07:20:12 +0000 |
parents | 974ba6ae0fa3 |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2004 Sam Lantinga |
630
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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 Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 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 Library 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 Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@devolution.com |
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21 */ |
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22 |
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23 #ifdef SAVE_RCSID |
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24 static char rcsid = |
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25 "@(#) $Id$"; |
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26 #endif |
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27 |
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28 #include <stdio.h> |
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29 #include <time.h> |
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30 #include <sys/time.h> |
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31 #include <unistd.h> |
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32 #include <string.h> |
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33 #include <errno.h> |
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34 |
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35 #include "SDL_error.h" |
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36 #include "SDL_timer.h" |
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37 #include "SDL_timer_c.h" |
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38 |
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39 #ifdef DISABLE_THREADS |
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40 /* Timer start/reset time */ |
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41 static Uint32 timerStart; |
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42 /* Timer running function */ |
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43 void RISCOS_CheckTimer(); |
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44 #else |
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45 #include <pthread.h> |
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46 extern Uint32 riscos_main_thread; |
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47 extern int riscos_using_threads; |
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48 extern Uint32 SDL_ThreadID(); |
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49 extern Uint32 SDL_EventThreadID(void); |
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50 #endif |
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51 |
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52 |
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53 extern void RISCOS_BackgroundTasks(void); |
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54 |
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55 /* The first ticks value of the application */ |
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56 clock_t start; |
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57 |
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58 void SDL_StartTicks(void) |
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59 { |
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60 /* Set first ticks value */ |
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61 start = clock(); |
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62 } |
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63 |
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64 Uint32 SDL_GetTicks (void) |
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65 { |
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66 clock_t ticks; |
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67 |
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68 ticks=clock()-start; |
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69 |
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70 |
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71 #if CLOCKS_PER_SEC == 1000 |
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72 |
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73 return(ticks); |
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74 |
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75 #elif CLOCKS_PER_SEC == 100 |
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76 |
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77 return (ticks * 10); |
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78 |
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79 #else |
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80 |
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81 return ticks*(1000/CLOCKS_PER_SEC); |
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82 |
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83 #endif |
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84 |
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85 } |
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86 |
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87 void SDL_Delay (Uint32 ms) |
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88 { |
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89 Uint32 now,then,elapsed; |
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90 #ifndef DISABLE_THREADS |
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91 int is_event_thread; |
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92 if (riscos_using_threads) |
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93 { |
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94 is_event_thread = 0; |
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95 if (SDL_EventThreadID()) |
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96 { |
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97 if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1; |
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98 } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1; |
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99 } else is_event_thread = 1; |
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100 #endif |
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101 |
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102 /*TODO: Next version of Unixlib may allow us to use usleep here */ |
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103 /* for non event threads */ |
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104 |
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105 /* Set the timeout interval - Linux only needs to do this once */ |
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106 then = SDL_GetTicks(); |
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107 |
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108 do { |
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109 /* Do background tasks required while sleeping as we are not multithreaded */ |
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110 #ifdef DISABLE_THREADS |
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111 RISCOS_BackgroundTasks(); |
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112 #else |
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113 /* For threaded build only run background tasks in event thread */ |
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114 if (is_event_thread) RISCOS_BackgroundTasks(); |
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115 #endif |
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116 |
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117 /* Calculate the time interval left (in case of interrupt) */ |
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118 now = SDL_GetTicks(); |
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119 elapsed = (now-then); |
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120 then = now; |
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121 if ( elapsed >= ms ) { |
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122 break; |
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123 } |
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124 ms -= elapsed; |
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125 #ifndef DISABLE_THREADS |
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126 /* Need to yield to let other threads have a go */ |
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127 if (riscos_using_threads) pthread_yield(); |
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128 #endif |
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129 |
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130 } while ( 1 ); |
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131 } |
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132 |
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133 #ifdef DISABLE_THREADS |
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134 |
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135 /* Non-threaded version of timer */ |
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136 |
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137 int SDL_SYS_TimerInit(void) |
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138 { |
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139 return(0); |
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140 } |
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141 |
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142 void SDL_SYS_TimerQuit(void) |
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143 { |
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144 SDL_SetTimer(0, NULL); |
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145 } |
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146 |
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147 int SDL_SYS_StartTimer(void) |
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148 { |
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149 timerStart = SDL_GetTicks(); |
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150 |
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151 return(0); |
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152 } |
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153 |
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154 void SDL_SYS_StopTimer(void) |
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155 { |
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156 /* Don't need to do anything as we use SDL_timer_running |
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157 to detect if we need to check the timer */ |
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158 } |
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159 |
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160 |
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161 void RISCOS_CheckTimer() |
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162 { |
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163 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval) |
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164 { |
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165 Uint32 ms; |
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166 |
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167 ms = SDL_alarm_callback(SDL_alarm_interval); |
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168 if ( ms != SDL_alarm_interval ) |
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169 { |
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170 if ( ms ) |
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171 { |
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172 SDL_alarm_interval = ROUND_RESOLUTION(ms); |
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173 } else |
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174 { |
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175 SDL_alarm_interval = 0; |
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176 SDL_timer_running = 0; |
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177 } |
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178 } |
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179 if (SDL_alarm_interval) timerStart = SDL_GetTicks(); |
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180 } |
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181 } |
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182 |
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183 #else |
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184 |
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185 /* Threaded version of timer - based on code for linux */ |
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186 |
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187 #include "SDL_thread.h" |
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188 |
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189 /* Data to handle a single periodic alarm */ |
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190 static int timer_alive = 0; |
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191 static SDL_Thread *timer = NULL; |
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192 |
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193 static int RunTimer(void *unused) |
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194 { |
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195 while ( timer_alive ) { |
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196 if ( SDL_timer_running ) { |
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197 SDL_ThreadedTimerCheck(); |
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198 } |
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199 SDL_Delay(1); |
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200 } |
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201 return(0); |
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202 } |
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203 |
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204 /* This is only called if the event thread is not running */ |
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205 int SDL_SYS_TimerInit(void) |
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206 { |
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207 timer_alive = 1; |
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208 timer = SDL_CreateThread(RunTimer, NULL); |
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209 if ( timer == NULL ) |
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210 return(-1); |
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211 return(SDL_SetTimerThreaded(1)); |
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212 } |
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213 |
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214 void SDL_SYS_TimerQuit(void) |
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215 { |
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216 timer_alive = 0; |
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217 if ( timer ) { |
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218 SDL_WaitThread(timer, NULL); |
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219 timer = NULL; |
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220 } |
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221 } |
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222 |
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223 int SDL_SYS_StartTimer(void) |
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224 { |
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225 SDL_SetError("Internal logic error: RISC OS uses threaded timer"); |
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226 return(-1); |
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227 } |
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228 |
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229 void SDL_SYS_StopTimer(void) |
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230 { |
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231 return; |
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232 } |
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233 |
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234 #endif /* DISABLE_THREADS */ |