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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 #ifdef SDL_TIMER_RISCOS |
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25 |
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26 #include <stdio.h> |
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27 #include <time.h> |
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28 #include <sys/time.h> |
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29 #include <unistd.h> |
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30 #include <string.h> |
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31 #include <errno.h> |
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32 |
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33 #include "SDL_timer.h" |
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34 #include "../SDL_timer_c.h" |
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35 |
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36 #if SDL_THREADS_DISABLED |
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37 /* Timer SDL_arraysize(Timer ),start/reset time */ |
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38 static Uint32 timerStart; |
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39 /* Timer running function */ |
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40 void RISCOS_CheckTimer(); |
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41 #else |
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42 #include <pthread.h> |
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43 extern Uint32 riscos_main_thread; |
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44 extern int riscos_using_threads; |
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45 extern Uint32 SDL_ThreadID(); |
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46 extern Uint32 SDL_EventThreadID(void); |
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47 #endif |
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48 |
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49 |
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50 extern void RISCOS_BackgroundTasks(void); |
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51 |
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52 /* The first ticks value of the application */ |
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53 clock_t start; |
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54 |
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55 void SDL_StartTicks(void) |
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56 { |
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57 /* Set first ticks value */ |
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58 start = clock(); |
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59 } |
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60 |
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61 Uint32 SDL_GetTicks (void) |
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62 { |
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63 clock_t ticks; |
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64 |
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65 ticks=clock()-start; |
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66 |
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67 |
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68 #if CLOCKS_PER_SEC == 1000 |
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69 |
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70 return(ticks); |
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71 |
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72 #elif CLOCKS_PER_SEC == 100 |
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73 |
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74 return (ticks * 10); |
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75 |
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76 #else |
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77 |
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78 return ticks*(1000/CLOCKS_PER_SEC); |
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79 |
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80 #endif |
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81 |
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82 } |
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83 |
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84 void SDL_Delay (Uint32 ms) |
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85 { |
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86 Uint32 now,then,elapsed; |
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87 #if !SDL_THREADS_DISABLED |
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88 int is_event_thread; |
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89 if (riscos_using_threads) |
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90 { |
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91 is_event_thread = 0; |
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92 if (SDL_EventThreadID()) |
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93 { |
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94 if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1; |
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95 } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1; |
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96 } else is_event_thread = 1; |
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97 #endif |
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98 |
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99 /*TODO: Next version of Unixlib may allow us to use usleep here */ |
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100 /* for non event threads */ |
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101 |
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102 /* Set the timeout interval - Linux only needs to do this once */ |
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103 then = SDL_GetTicks(); |
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104 |
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105 do { |
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106 /* Do background tasks required while sleeping as we are not multithreaded */ |
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107 #if SDL_THREADS_DISABLED |
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108 RISCOS_BackgroundTasks(); |
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109 #else |
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110 /* For threaded build only run background tasks in event thread */ |
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111 if (is_event_thread) RISCOS_BackgroundTasks(); |
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112 #endif |
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113 |
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114 /* Calculate the time interval left (in case of interrupt) */ |
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115 now = SDL_GetTicks(); |
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116 elapsed = (now-then); |
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117 then = now; |
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118 if ( elapsed >= ms ) { |
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119 break; |
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120 } |
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121 ms -= elapsed; |
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122 #if !SDL_THREADS_DISABLED |
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123 /* Need to yield to let other threads have a go */ |
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124 if (riscos_using_threads) pthread_yield(); |
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125 #endif |
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126 |
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127 } while ( 1 ); |
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128 } |
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129 |
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130 #if SDL_THREADS_DISABLED |
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131 |
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132 /* Non-threaded version of timer */ |
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133 |
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134 int SDL_SYS_TimerInit(void) |
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135 { |
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136 return(0); |
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137 } |
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138 |
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139 void SDL_SYS_TimerQuit(void) |
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140 { |
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141 SDL_SetTimer(0, NULL); |
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142 } |
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143 |
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144 int SDL_SYS_StartTimer(void) |
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145 { |
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146 timerStart = SDL_GetTicks(); |
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147 |
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148 return(0); |
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149 } |
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150 |
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151 void SDL_SYS_StopTimer(void) |
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152 { |
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153 /* Don't need to do anything as we use SDL_timer_running |
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154 to detect if we need to check the timer */ |
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155 } |
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156 |
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157 |
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158 void RISCOS_CheckTimer() |
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159 { |
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160 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval) |
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161 { |
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162 Uint32 ms; |
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163 |
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164 ms = SDL_alarm_callback(SDL_alarm_interval); |
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165 if ( ms != SDL_alarm_interval ) |
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166 { |
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167 if ( ms ) |
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168 { |
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169 SDL_alarm_interval = ROUND_RESOLUTION(ms); |
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170 } else |
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171 { |
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172 SDL_alarm_interval = 0; |
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173 SDL_timer_running = 0; |
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174 } |
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175 } |
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176 if (SDL_alarm_interval) timerStart = SDL_GetTicks(); |
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177 } |
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178 } |
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179 |
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180 #else |
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181 |
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182 /* Threaded version of timer - based on code for linux */ |
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183 |
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184 #include "SDL_thread.h" |
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185 |
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186 /* Data to handle a single periodic alarm */ |
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187 static int timer_alive = 0; |
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188 static SDL_Thread *timer = NULL; |
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189 |
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190 static int RunTimer(void *unused) |
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191 { |
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192 while ( timer_alive ) { |
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193 if ( SDL_timer_running ) { |
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194 SDL_ThreadedTimerCheck(); |
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195 } |
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196 SDL_Delay(1); |
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197 } |
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198 return(0); |
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199 } |
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200 |
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201 /* This is only called if the event thread is not running */ |
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202 int SDL_SYS_TimerInit(void) |
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203 { |
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204 timer_alive = 1; |
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205 timer = SDL_CreateThread(RunTimer, NULL); |
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206 if ( timer == NULL ) |
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207 return(-1); |
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208 return(SDL_SetTimerThreaded(1)); |
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209 } |
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210 |
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211 void SDL_SYS_TimerQuit(void) |
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212 { |
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213 timer_alive = 0; |
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214 if ( timer ) { |
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215 SDL_WaitThread(timer, NULL); |
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216 timer = NULL; |
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217 } |
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218 } |
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219 |
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220 int SDL_SYS_StartTimer(void) |
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221 { |
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222 SDL_SetError("Internal logic error: RISC OS uses threaded timer"); |
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223 return(-1); |
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224 } |
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225 |
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226 void SDL_SYS_StopTimer(void) |
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227 { |
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228 return; |
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229 } |
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230 |
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231 #endif /* SDL_THREADS_DISABLED */ |
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232 |
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233 #endif /* SDL_TIMER_RISCOS */ |