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annotate src/timer/riscos/SDL_systimer.c @ 4159:a1b03ba2fcd0 SDL-1.2

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Updated copyright date
author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 Dec 2008 00:25:42 +0000
parents 92947e3a18db
children
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 #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 */