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annotate src/timer/riscos/SDL_systimer.c @ 1358:c71e05b4dc2e

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More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents c9b51268668f
children 19418e4422cb
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
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23 #include <stdio.h>
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24 #include <time.h>
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25 #include <sys/time.h>
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26 #include <unistd.h>
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27 #include <string.h>
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28 #include <errno.h>
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29
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30 #include "SDL_timer.h"
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31 #include "SDL_timer_c.h"
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32
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33 #ifdef DISABLE_THREADS
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34 /* Timer start/reset time */
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35 static Uint32 timerStart;
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36 /* Timer running function */
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37 void RISCOS_CheckTimer();
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38 #else
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39 #include <pthread.h>
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40 extern Uint32 riscos_main_thread;
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41 extern int riscos_using_threads;
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42 extern Uint32 SDL_ThreadID();
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43 extern Uint32 SDL_EventThreadID(void);
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44 #endif
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45
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46
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47 extern void RISCOS_BackgroundTasks(void);
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48
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49 /* The first ticks value of the application */
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50 clock_t start;
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51
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52 void SDL_StartTicks(void)
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53 {
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54 /* Set first ticks value */
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55 start = clock();
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56 }
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57
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58 Uint32 SDL_GetTicks (void)
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59 {
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60 clock_t ticks;
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61
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62 ticks=clock()-start;
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63
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64
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65 #if CLOCKS_PER_SEC == 1000
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66
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67 return(ticks);
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68
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69 #elif CLOCKS_PER_SEC == 100
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70
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71 return (ticks * 10);
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72
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73 #else
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74
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75 return ticks*(1000/CLOCKS_PER_SEC);
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76
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77 #endif
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78
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79 }
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80
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81 void SDL_Delay (Uint32 ms)
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82 {
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83 Uint32 now,then,elapsed;
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84 #ifndef DISABLE_THREADS
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85 int is_event_thread;
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86 if (riscos_using_threads)
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87 {
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88 is_event_thread = 0;
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89 if (SDL_EventThreadID())
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90 {
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91 if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1;
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92 } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1;
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93 } else is_event_thread = 1;
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94 #endif
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95
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96 /*TODO: Next version of Unixlib may allow us to use usleep here */
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97 /* for non event threads */
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98
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99 /* Set the timeout interval - Linux only needs to do this once */
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100 then = SDL_GetTicks();
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101
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102 do {
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103 /* Do background tasks required while sleeping as we are not multithreaded */
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104 #ifdef DISABLE_THREADS
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105 RISCOS_BackgroundTasks();
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106 #else
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107 /* For threaded build only run background tasks in event thread */
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108 if (is_event_thread) RISCOS_BackgroundTasks();
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109 #endif
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110
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111 /* Calculate the time interval left (in case of interrupt) */
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112 now = SDL_GetTicks();
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113 elapsed = (now-then);
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114 then = now;
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115 if ( elapsed >= ms ) {
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116 break;
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117 }
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118 ms -= elapsed;
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119 #ifndef DISABLE_THREADS
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120 /* Need to yield to let other threads have a go */
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121 if (riscos_using_threads) pthread_yield();
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122 #endif
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123
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124 } while ( 1 );
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125 }
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126
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127 #ifdef DISABLE_THREADS
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128
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129 /* Non-threaded version of timer */
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130
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131 int SDL_SYS_TimerInit(void)
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132 {
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133 return(0);
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134 }
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135
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136 void SDL_SYS_TimerQuit(void)
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137 {
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138 SDL_SetTimer(0, NULL);
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139 }
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140
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141 int SDL_SYS_StartTimer(void)
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142 {
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143 timerStart = SDL_GetTicks();
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144
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145 return(0);
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146 }
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147
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148 void SDL_SYS_StopTimer(void)
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149 {
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150 /* Don't need to do anything as we use SDL_timer_running
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151 to detect if we need to check the timer */
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152 }
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153
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154
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155 void RISCOS_CheckTimer()
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156 {
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157 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval)
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158 {
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159 Uint32 ms;
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160
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161 ms = SDL_alarm_callback(SDL_alarm_interval);
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162 if ( ms != SDL_alarm_interval )
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163 {
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164 if ( ms )
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165 {
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166 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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167 } else
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168 {
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169 SDL_alarm_interval = 0;
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170 SDL_timer_running = 0;
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171 }
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172 }
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173 if (SDL_alarm_interval) timerStart = SDL_GetTicks();
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174 }
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175 }
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176
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177 #else
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178
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179 /* Threaded version of timer - based on code for linux */
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180
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181 #include "SDL_thread.h"
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182
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183 /* Data to handle a single periodic alarm */
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184 static int timer_alive = 0;
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185 static SDL_Thread *timer = NULL;
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186
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187 static int RunTimer(void *unused)
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188 {
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189 while ( timer_alive ) {
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190 if ( SDL_timer_running ) {
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191 SDL_ThreadedTimerCheck();
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192 }
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193 SDL_Delay(1);
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194 }
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195 return(0);
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196 }
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197
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198 /* This is only called if the event thread is not running */
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199 int SDL_SYS_TimerInit(void)
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200 {
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201 timer_alive = 1;
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202 timer = SDL_CreateThread(RunTimer, NULL);
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203 if ( timer == NULL )
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204 return(-1);
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205 return(SDL_SetTimerThreaded(1));
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206 }
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207
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208 void SDL_SYS_TimerQuit(void)
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209 {
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210 timer_alive = 0;
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211 if ( timer ) {
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212 SDL_WaitThread(timer, NULL);
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213 timer = NULL;
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214 }
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215 }
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216
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217 int SDL_SYS_StartTimer(void)
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218 {
1035
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219 SDL_SetError("Internal logic error: RISC OS uses threaded timer");
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220 return(-1);
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221 }
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222
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223 void SDL_SYS_StopTimer(void)
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224 {
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225 return;
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226 }
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227
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228 #endif /* DISABLE_THREADS */