Mercurial > sdl-ios-xcode
annotate src/timer/linux/SDL_systimer.c @ 1158:ec446adf8cb2
POSIX clock_gettime() isn't available on Linux before 2.6, and the symbol may
just be flat out missing from glibc, so force use of previous gettimeofday()
behaviour for now.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 11 Oct 2005 20:05:54 +0000 |
| parents | baf35853ad54 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
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21 |
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22 RDTSC stuff by lompik (lompik@voila.fr) 20/03/2002 |
| 0 | 23 */ |
| 24 | |
| 25 #ifdef SAVE_RCSID | |
| 26 static char rcsid = | |
| 27 "@(#) $Id$"; | |
| 28 #endif | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <sys/time.h> | |
| 32 #include <signal.h> | |
| 33 #include <unistd.h> | |
| 34 #include <string.h> | |
| 35 #include <errno.h> | |
| 36 | |
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37 /* The clock_gettime provides monotonous time, so we should use it if |
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38 it's available. The clock_gettime function is behind ifdef |
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39 for __USE_POSIX199309 |
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40 Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005 |
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41 */ |
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42 #if (defined _POSIX_TIMERS && _POSIX_TIMERS > 0) |
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43 #include <time.h> |
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44 /* |
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45 * clock_gettime() is missing in my system's glibc, and apparently isn't |
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46 * available before Linux kernel 2.6...you can uncomment the following |
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47 * define to use it, since it may be a better solution than |
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48 * gettimeofday() on systems that support the newer syscall. --ryan. |
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49 */ |
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50 /*#define USE_CLOCK_GETTIME*/ |
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51 #endif |
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52 |
| 0 | 53 #include "SDL_error.h" |
| 54 #include "SDL_timer.h" | |
| 55 #include "SDL_timer_c.h" | |
| 56 | |
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57 #if _POSIX_THREAD_SYSCALL_SOFT |
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58 #include <pthread.h> |
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59 #endif |
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60 #ifdef ENABLE_PTH |
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61 #include <pth.h> |
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62 #endif |
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63 |
| 0 | 64 #if defined(DISABLE_THREADS) || defined(FORK_HACK) |
| 65 #define USE_ITIMER | |
| 66 #endif | |
| 67 | |
| 68 /* The following defines should really be determined at configure time */ | |
| 69 | |
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70 #if defined(linux) |
| 0 | 71 /* Linux select() changes its timeout parameter upon return to contain |
| 72 the remaining time. Most other unixen leave it unchanged or undefined. */ | |
| 73 #define SELECT_SETS_REMAINING | |
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74 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun) || defined(MACOSX) |
| 0 | 75 #define USE_NANOSLEEP |
| 76 #endif | |
| 77 | |
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78 #if defined(i386) || defined(__i386__) |
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79 /* This only works on pentium or newer x86 processors */ |
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80 /* Actually, this isn't reliable on multi-cpu systems, so is disabled */ |
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81 /*#define USE_RDTSC*/ |
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82 #endif |
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83 |
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84 |
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85 #ifdef USE_RDTSC |
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86 |
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87 /* The first ticks value of the application */ |
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88 static unsigned long long start; |
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89 static float cpu_mhz1000 = 0.0f; |
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90 |
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91 #if 1 |
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92 /* This is for old binutils version that don't recognize rdtsc mnemonics. |
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93 But all binutils version supports this. |
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94 */ |
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95 #define rdtsc(t) asm __volatile__ (".byte 0x0f, 0x31; " : "=A" (t)) |
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96 #else |
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97 #define rdtsc(t) asm __volatile__ ("rdtsc" : "=A" (t)) |
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98 #endif |
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99 |
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100 static float calc_cpu_mhz(void) |
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101 { |
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102 float cpu_mhz; |
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103 unsigned long long tsc_start; |
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104 unsigned long long tsc_end; |
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105 /* Slight code doubling here for the sake of readability */ |
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106 #ifdef USE_CLOCK_GETTIME |
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107 struct timespec tv_start, tv_end; |
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108 long usec_delay; |
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109 |
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110 rdtsc(tsc_start); |
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111 clock_gettime(CLOCK_MONOTONIC,&tv_start); |
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112 sleep(1); |
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113 rdtsc(tsc_end); |
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114 clock_gettime(CLOCK_MONOTONIC,&tv_end); |
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115 usec_delay = (1000000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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116 (tv_end.tv_nsec - tv_start.tv_nsec)) / 1000; |
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117 #else |
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118 struct timeval tv_start, tv_end; |
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119 long usec_delay; |
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120 |
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121 rdtsc(tsc_start); |
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122 gettimeofday(&tv_start, NULL); |
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123 sleep(1); |
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124 rdtsc(tsc_end); |
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125 gettimeofday(&tv_end, NULL); |
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126 usec_delay = 1000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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127 (tv_end.tv_usec - tv_start.tv_usec); |
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128 #endif /* USE_CLOCK_GETTIME */ |
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129 cpu_mhz = (float)(tsc_end-tsc_start) / usec_delay; |
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130 #if 0 |
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131 printf("cpu MHz\t\t: %.3f\n", cpu_mhz); |
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132 #endif |
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133 return cpu_mhz; |
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134 } |
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135 |
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136 #else |
| 0 | 137 |
| 138 /* The first ticks value of the application */ | |
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139 #ifdef USE_CLOCK_GETTIME |
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140 static struct timespec start; |
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141 #else |
| 0 | 142 static struct timeval start; |
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143 #endif /* USE_CLOCK_GETTIME */ |
| 0 | 144 |
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145 #endif /* USE_RDTSC */ |
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146 |
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147 |
| 0 | 148 void SDL_StartTicks(void) |
| 149 { | |
| 150 /* Set first ticks value */ | |
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151 #ifdef USE_RDTSC |
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152 if ( ! cpu_mhz1000 ) { |
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153 cpu_mhz1000 = calc_cpu_mhz() * 1000.0f; |
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154 } |
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155 rdtsc(start); |
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156 #elif defined(USE_CLOCK_GETTIME) |
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157 clock_gettime(CLOCK_MONOTONIC,&start); |
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158 #else |
| 0 | 159 gettimeofday(&start, NULL); |
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160 #endif |
| 0 | 161 } |
| 162 | |
| 163 Uint32 SDL_GetTicks (void) | |
| 164 { | |
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165 #ifdef USE_RDTSC |
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166 unsigned long long now; |
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167 if ( ! cpu_mhz1000 ) { |
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168 return 0; /* Shouldn't happen. BUG!! */ |
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169 } |
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170 rdtsc(now); |
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171 return (Uint32)((now-start)/cpu_mhz1000); |
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172 #elif defined(USE_CLOCK_GETTIME) |
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173 Uint32 ticks; |
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174 struct timespec now; |
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175 clock_gettime(CLOCK_MONOTONIC,&now); |
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176 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000; |
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177 return(ticks); |
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178 #else |
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179 Uint32 ticks; |
| 0 | 180 struct timeval now; |
| 181 gettimeofday(&now, NULL); | |
| 182 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000; | |
| 183 return(ticks); | |
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184 #endif |
| 0 | 185 } |
| 186 | |
| 187 void SDL_Delay (Uint32 ms) | |
| 188 { | |
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189 #ifdef ENABLE_PTH |
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190 pth_time_t tv; |
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191 tv.tv_sec = ms/1000; |
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192 tv.tv_usec = (ms%1000)*1000; |
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193 pth_nap(tv); |
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194 #else |
| 0 | 195 int was_error; |
| 196 | |
| 197 #ifdef USE_NANOSLEEP | |
| 198 struct timespec elapsed, tv; | |
| 199 #else | |
| 200 struct timeval tv; | |
| 201 #ifndef SELECT_SETS_REMAINING | |
| 202 Uint32 then, now, elapsed; | |
| 203 #endif | |
| 204 #endif | |
| 205 | |
| 206 /* Set the timeout interval - Linux only needs to do this once */ | |
| 207 #ifdef SELECT_SETS_REMAINING | |
| 208 tv.tv_sec = ms/1000; | |
| 209 tv.tv_usec = (ms%1000)*1000; | |
| 210 #elif defined(USE_NANOSLEEP) | |
| 211 elapsed.tv_sec = ms/1000; | |
| 212 elapsed.tv_nsec = (ms%1000)*1000000; | |
| 213 #else | |
| 214 then = SDL_GetTicks(); | |
| 215 #endif | |
| 216 do { | |
| 217 errno = 0; | |
| 218 | |
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219 #if _POSIX_THREAD_SYSCALL_SOFT |
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220 pthread_yield_np(); |
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221 #endif |
| 0 | 222 #ifdef USE_NANOSLEEP |
| 223 tv.tv_sec = elapsed.tv_sec; | |
| 224 tv.tv_nsec = elapsed.tv_nsec; | |
| 225 was_error = nanosleep(&tv, &elapsed); | |
| 226 #else | |
| 227 #ifndef SELECT_SETS_REMAINING | |
| 228 /* Calculate the time interval left (in case of interrupt) */ | |
| 229 now = SDL_GetTicks(); | |
| 230 elapsed = (now-then); | |
| 231 then = now; | |
| 232 if ( elapsed >= ms ) { | |
| 233 break; | |
| 234 } | |
| 235 ms -= elapsed; | |
| 236 tv.tv_sec = ms/1000; | |
| 237 tv.tv_usec = (ms%1000)*1000; | |
| 238 #endif | |
| 239 was_error = select(0, NULL, NULL, NULL, &tv); | |
| 240 #endif /* USE_NANOSLEEP */ | |
| 241 } while ( was_error && (errno == EINTR) ); | |
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242 #endif /* ENABLE_PTH */ |
| 0 | 243 } |
| 244 | |
| 245 #ifdef USE_ITIMER | |
| 246 | |
| 247 static void HandleAlarm(int sig) | |
| 248 { | |
| 249 Uint32 ms; | |
| 250 | |
| 251 if ( SDL_alarm_callback ) { | |
| 252 ms = (*SDL_alarm_callback)(SDL_alarm_interval); | |
| 253 if ( ms != SDL_alarm_interval ) { | |
| 254 SDL_SetTimer(ms, SDL_alarm_callback); | |
| 255 } | |
| 256 } | |
| 257 } | |
| 258 | |
| 259 int SDL_SYS_TimerInit(void) | |
| 260 { | |
| 261 struct sigaction action; | |
| 262 | |
| 263 /* Set the alarm handler (Linux specific) */ | |
| 264 memset(&action, 0, sizeof(action)); | |
| 265 action.sa_handler = HandleAlarm; | |
| 266 action.sa_flags = SA_RESTART; | |
| 267 sigemptyset(&action.sa_mask); | |
| 268 sigaction(SIGALRM, &action, NULL); | |
| 269 return(0); | |
| 270 } | |
| 271 | |
| 272 void SDL_SYS_TimerQuit(void) | |
| 273 { | |
| 274 SDL_SetTimer(0, NULL); | |
| 275 } | |
| 276 | |
| 277 int SDL_SYS_StartTimer(void) | |
| 278 { | |
| 279 struct itimerval timer; | |
| 280 | |
| 281 timer.it_value.tv_sec = (SDL_alarm_interval/1000); | |
| 282 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 283 timer.it_interval.tv_sec = (SDL_alarm_interval/1000); | |
| 284 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 285 setitimer(ITIMER_REAL, &timer, NULL); | |
| 286 return(0); | |
| 287 } | |
| 288 | |
| 289 void SDL_SYS_StopTimer(void) | |
| 290 { | |
| 291 struct itimerval timer; | |
| 292 | |
| 293 memset(&timer, 0, (sizeof timer)); | |
| 294 setitimer(ITIMER_REAL, &timer, NULL); | |
| 295 } | |
| 296 | |
| 297 #else /* USE_ITIMER */ | |
| 298 | |
| 299 #include "SDL_thread.h" | |
| 300 | |
| 301 /* Data to handle a single periodic alarm */ | |
| 302 static int timer_alive = 0; | |
| 303 static SDL_Thread *timer = NULL; | |
| 304 | |
| 305 static int RunTimer(void *unused) | |
| 306 { | |
| 307 while ( timer_alive ) { | |
| 308 if ( SDL_timer_running ) { | |
| 309 SDL_ThreadedTimerCheck(); | |
| 310 } | |
| 311 SDL_Delay(1); | |
| 312 } | |
| 313 return(0); | |
| 314 } | |
| 315 | |
| 316 /* This is only called if the event thread is not running */ | |
| 317 int SDL_SYS_TimerInit(void) | |
| 318 { | |
| 319 timer_alive = 1; | |
| 320 timer = SDL_CreateThread(RunTimer, NULL); | |
| 321 if ( timer == NULL ) | |
| 322 return(-1); | |
| 323 return(SDL_SetTimerThreaded(1)); | |
| 324 } | |
| 325 | |
| 326 void SDL_SYS_TimerQuit(void) | |
| 327 { | |
| 328 timer_alive = 0; | |
| 329 if ( timer ) { | |
| 330 SDL_WaitThread(timer, NULL); | |
| 331 timer = NULL; | |
| 332 } | |
| 333 } | |
| 334 | |
| 335 int SDL_SYS_StartTimer(void) | |
| 336 { | |
| 337 SDL_SetError("Internal logic error: Linux uses threaded timer"); | |
| 338 return(-1); | |
| 339 } | |
| 340 | |
| 341 void SDL_SYS_StopTimer(void) | |
| 342 { | |
| 343 return; | |
| 344 } | |
| 345 | |
| 346 #endif /* USE_ITIMER */ |