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annotate src/timer/riscos/SDL_systimer.c @ 1035:974ba6ae0fa3

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Date: Wed, 26 Jan 2005 13:37:09 GMT From: Peter Naulls Subject: RISC OS SDL Patches Sam, I've attached a diff of the latest changes to libSDL for RISC OS support. These changes are by Alan Buckley and myself. The most significant of these are: Optimised assembler blit rountines - I've attached the file src/video/riscos/SDL_riscosASM.s which is needed for this. Move to using /dev/dsp instead of its own audio implementation. This means that src/audio/riscos/SDL_drenderer.c should be removed Typo fixes. Mainly correct spelling of "RISC OS", but some from elsewhere too.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2005 18:01:31 +0000
parents d74fbf56f2f6
children c9b51268668f
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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
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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 }
955
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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 {
1035
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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 */