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annotate src/timer/riscos/SDL_systimer.c @ 2210:1de324fce4e8

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author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Jul 2007 01:17:38 +0000
parents c121d94672cb
children e27bdcc80744
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 #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
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56 SDL_StartTicks(void)
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57 {
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58 /* Set first ticks value */
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59 start = clock();
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60 }
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61
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62 Uint32
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63 SDL_GetTicks(void)
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64 {
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65 clock_t ticks;
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66
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67 ticks = clock() - start;
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68
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69
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70 #if CLOCKS_PER_SEC == 1000
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71
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72 return (ticks);
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73
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74 #elif CLOCKS_PER_SEC == 100
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75
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76 return (ticks * 10);
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77
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78 #else
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79
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80 return ticks * (1000 / CLOCKS_PER_SEC);
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81
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82 #endif
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83
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84 }
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85
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86 void
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87 SDL_Delay(Uint32 ms)
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88 {
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89 Uint32 now, then, elapsed;
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90 #if !SDL_THREADS_DISABLED
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91 int is_event_thread;
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92 if (riscos_using_threads) {
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93 is_event_thread = 0;
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94 if (SDL_EventThreadID()) {
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95 if (SDL_EventThreadID() == SDL_ThreadID())
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96 is_event_thread = 1;
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97 } else if (SDL_ThreadID() == riscos_main_thread)
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98 is_event_thread = 1;
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99 } else
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100 is_event_thread = 1;
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101 #endif
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102
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103 /*TODO: Next version of Unixlib may allow us to use usleep here */
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104 /* for non event threads */
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105
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106 /* Set the timeout interval - Linux only needs to do this once */
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107 then = SDL_GetTicks();
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108
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109 do {
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110 /* Do background tasks required while sleeping as we are not multithreaded */
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111 #if SDL_THREADS_DISABLED
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112 RISCOS_BackgroundTasks();
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113 #else
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114 /* For threaded build only run background tasks in event thread */
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115 if (is_event_thread)
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116 RISCOS_BackgroundTasks();
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117 #endif
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118
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119 /* Calculate the time interval left (in case of interrupt) */
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120 now = SDL_GetTicks();
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121 elapsed = (now - then);
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122 then = now;
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123 if (elapsed >= ms) {
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124 break;
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125 }
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126 ms -= elapsed;
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127 #if !SDL_THREADS_DISABLED
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128 /* Need to yield to let other threads have a go */
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129 if (riscos_using_threads)
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130 pthread_yield();
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131 #endif
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132
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133 }
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134 while (1);
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135 }
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136
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137 #if SDL_THREADS_DISABLED
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138
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139 /* Non-threaded version of timer */
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140
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141 int
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142 SDL_SYS_TimerInit(void)
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143 {
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144 return (0);
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145 }
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146
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147 void
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148 SDL_SYS_TimerQuit(void)
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149 {
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150 SDL_SetTimer(0, NULL);
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151 }
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152
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153 int
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154 SDL_SYS_StartTimer(void)
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155 {
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156 timerStart = SDL_GetTicks();
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157
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158 return (0);
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159 }
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160
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161 void
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162 SDL_SYS_StopTimer(void)
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163 {
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164 /* Don't need to do anything as we use SDL_timer_running
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165 to detect if we need to check the timer */
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166 }
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167
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168
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169 void
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170 RISCOS_CheckTimer()
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171 {
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172 if (SDL_timer_running
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173 && SDL_GetTicks() - timerStart >= SDL_alarm_interval) {
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174 Uint32 ms;
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175
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176 ms = SDL_alarm_callback(SDL_alarm_interval);
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177 if (ms != SDL_alarm_interval) {
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178 if (ms) {
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179 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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180 } else {
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181 SDL_alarm_interval = 0;
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182 SDL_timer_running = 0;
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183 }
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184 }
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185 if (SDL_alarm_interval)
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186 timerStart = SDL_GetTicks();
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187 }
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188 }
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189
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190 #else
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191
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192 /* Threaded version of timer - based on code for linux */
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193
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194 #include "SDL_thread.h"
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195
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196 /* Data to handle a single periodic alarm */
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197 static int timer_alive = 0;
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198 static SDL_Thread *timer = NULL;
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199
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200 static int
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201 RunTimer(void *unused)
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202 {
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203 while (timer_alive) {
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204 if (SDL_timer_running) {
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205 SDL_ThreadedTimerCheck();
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206 }
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207 SDL_Delay(1);
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208 }
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209 return (0);
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210 }
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211
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212 /* This is only called if the event thread is not running */
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213 int
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214 SDL_SYS_TimerInit(void)
955
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215 {
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216 timer_alive = 1;
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217 timer = SDL_CreateThread(RunTimer, NULL);
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218 if (timer == NULL)
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219 return (-1);
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220 return (SDL_SetTimerThreaded(1));
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221 }
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222
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223 void
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224 SDL_SYS_TimerQuit(void)
955
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225 {
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226 timer_alive = 0;
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227 if (timer) {
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228 SDL_WaitThread(timer, NULL);
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229 timer = NULL;
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230 }
955
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231 }
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232
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233 int
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234 SDL_SYS_StartTimer(void)
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235 {
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236 SDL_SetError("Internal logic error: RISC OS uses threaded timer");
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237 return (-1);
955
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238 }
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239
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240 void
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241 SDL_SYS_StopTimer(void)
955
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242 {
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243 return;
955
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244 }
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245
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246 #endif /* SDL_THREADS_DISABLED */
1635
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247
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248 #endif /* SDL_TIMER_RISCOS */
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249 /* vi: set ts=4 sw=4 expandtab: */