Mercurial > sdl-ios-xcode
annotate src/timer/linux/SDL_systimer.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | ec446adf8cb2 |
| children | 9439c2f1da89 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 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 #include <stdio.h> | |
| 26 #include <sys/time.h> | |
| 27 #include <signal.h> | |
| 28 #include <unistd.h> | |
| 29 #include <string.h> | |
| 30 #include <errno.h> | |
| 31 | |
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32 /* The clock_gettime provides monotonous time, so we should use it if |
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33 it's available. The clock_gettime function is behind ifdef |
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34 for __USE_POSIX199309 |
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35 Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005 |
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36 */ |
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37 #if (defined _POSIX_TIMERS && _POSIX_TIMERS > 0) |
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38 #include <time.h> |
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39 /* |
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40 * clock_gettime() is missing in my system's glibc, and apparently isn't |
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41 * available before Linux kernel 2.6...you can uncomment the following |
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42 * define to use it, since it may be a better solution than |
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43 * gettimeofday() on systems that support the newer syscall. --ryan. |
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44 */ |
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45 /*#define USE_CLOCK_GETTIME*/ |
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46 #endif |
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47 |
| 0 | 48 #include "SDL_error.h" |
| 49 #include "SDL_timer.h" | |
| 50 #include "SDL_timer_c.h" | |
| 51 | |
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52 #if _POSIX_THREAD_SYSCALL_SOFT |
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53 #include <pthread.h> |
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54 #endif |
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55 #ifdef ENABLE_PTH |
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56 #include <pth.h> |
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57 #endif |
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58 |
| 0 | 59 #if defined(DISABLE_THREADS) || defined(FORK_HACK) |
| 60 #define USE_ITIMER | |
| 61 #endif | |
| 62 | |
| 63 /* The following defines should really be determined at configure time */ | |
| 64 | |
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65 #if defined(linux) |
| 0 | 66 /* Linux select() changes its timeout parameter upon return to contain |
| 67 the remaining time. Most other unixen leave it unchanged or undefined. */ | |
| 68 #define SELECT_SETS_REMAINING | |
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69 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun) || defined(MACOSX) |
| 0 | 70 #define USE_NANOSLEEP |
| 71 #endif | |
| 72 | |
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73 #if defined(i386) || defined(__i386__) |
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74 /* This only works on pentium or newer x86 processors */ |
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75 /* Actually, this isn't reliable on multi-cpu systems, so is disabled */ |
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76 /*#define USE_RDTSC*/ |
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77 #endif |
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78 |
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79 |
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80 #ifdef USE_RDTSC |
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81 |
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82 /* The first ticks value of the application */ |
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83 static unsigned long long start; |
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84 static float cpu_mhz1000 = 0.0f; |
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85 |
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86 #if 1 |
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87 /* This is for old binutils version that don't recognize rdtsc mnemonics. |
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88 But all binutils version supports this. |
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89 */ |
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90 #define rdtsc(t) asm __volatile__ (".byte 0x0f, 0x31; " : "=A" (t)) |
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91 #else |
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92 #define rdtsc(t) asm __volatile__ ("rdtsc" : "=A" (t)) |
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93 #endif |
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94 |
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95 static float calc_cpu_mhz(void) |
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96 { |
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97 float cpu_mhz; |
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98 unsigned long long tsc_start; |
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99 unsigned long long tsc_end; |
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100 /* Slight code doubling here for the sake of readability */ |
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101 #ifdef USE_CLOCK_GETTIME |
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102 struct timespec tv_start, tv_end; |
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103 long usec_delay; |
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104 |
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105 rdtsc(tsc_start); |
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106 clock_gettime(CLOCK_MONOTONIC,&tv_start); |
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107 sleep(1); |
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108 rdtsc(tsc_end); |
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109 clock_gettime(CLOCK_MONOTONIC,&tv_end); |
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110 usec_delay = (1000000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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111 (tv_end.tv_nsec - tv_start.tv_nsec)) / 1000; |
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112 #else |
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113 struct timeval tv_start, tv_end; |
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114 long usec_delay; |
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115 |
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116 rdtsc(tsc_start); |
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117 gettimeofday(&tv_start, NULL); |
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118 sleep(1); |
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119 rdtsc(tsc_end); |
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120 gettimeofday(&tv_end, NULL); |
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121 usec_delay = 1000000L * (tv_end.tv_sec - tv_start.tv_sec) + |
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122 (tv_end.tv_usec - tv_start.tv_usec); |
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123 #endif /* USE_CLOCK_GETTIME */ |
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124 cpu_mhz = (float)(tsc_end-tsc_start) / usec_delay; |
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125 #if 0 |
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126 printf("cpu MHz\t\t: %.3f\n", cpu_mhz); |
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127 #endif |
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128 return cpu_mhz; |
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129 } |
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130 |
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131 #else |
| 0 | 132 |
| 133 /* The first ticks value of the application */ | |
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134 #ifdef USE_CLOCK_GETTIME |
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135 static struct timespec start; |
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136 #else |
| 0 | 137 static struct timeval start; |
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138 #endif /* USE_CLOCK_GETTIME */ |
| 0 | 139 |
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140 #endif /* USE_RDTSC */ |
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141 |
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142 |
| 0 | 143 void SDL_StartTicks(void) |
| 144 { | |
| 145 /* Set first ticks value */ | |
|
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146 #ifdef USE_RDTSC |
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147 if ( ! cpu_mhz1000 ) { |
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148 cpu_mhz1000 = calc_cpu_mhz() * 1000.0f; |
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149 } |
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150 rdtsc(start); |
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151 #elif defined(USE_CLOCK_GETTIME) |
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152 clock_gettime(CLOCK_MONOTONIC,&start); |
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153 #else |
| 0 | 154 gettimeofday(&start, NULL); |
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155 #endif |
| 0 | 156 } |
| 157 | |
| 158 Uint32 SDL_GetTicks (void) | |
| 159 { | |
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160 #ifdef USE_RDTSC |
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161 unsigned long long now; |
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162 if ( ! cpu_mhz1000 ) { |
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163 return 0; /* Shouldn't happen. BUG!! */ |
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164 } |
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165 rdtsc(now); |
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166 return (Uint32)((now-start)/cpu_mhz1000); |
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167 #elif defined(USE_CLOCK_GETTIME) |
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168 Uint32 ticks; |
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169 struct timespec now; |
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170 clock_gettime(CLOCK_MONOTONIC,&now); |
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171 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000; |
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172 return(ticks); |
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173 #else |
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174 Uint32 ticks; |
| 0 | 175 struct timeval now; |
| 176 gettimeofday(&now, NULL); | |
| 177 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000; | |
| 178 return(ticks); | |
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179 #endif |
| 0 | 180 } |
| 181 | |
| 182 void SDL_Delay (Uint32 ms) | |
| 183 { | |
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184 #ifdef ENABLE_PTH |
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185 pth_time_t tv; |
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186 tv.tv_sec = ms/1000; |
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187 tv.tv_usec = (ms%1000)*1000; |
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188 pth_nap(tv); |
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189 #else |
| 0 | 190 int was_error; |
| 191 | |
| 192 #ifdef USE_NANOSLEEP | |
| 193 struct timespec elapsed, tv; | |
| 194 #else | |
| 195 struct timeval tv; | |
| 196 #ifndef SELECT_SETS_REMAINING | |
| 197 Uint32 then, now, elapsed; | |
| 198 #endif | |
| 199 #endif | |
| 200 | |
| 201 /* Set the timeout interval - Linux only needs to do this once */ | |
| 202 #ifdef SELECT_SETS_REMAINING | |
| 203 tv.tv_sec = ms/1000; | |
| 204 tv.tv_usec = (ms%1000)*1000; | |
| 205 #elif defined(USE_NANOSLEEP) | |
| 206 elapsed.tv_sec = ms/1000; | |
| 207 elapsed.tv_nsec = (ms%1000)*1000000; | |
| 208 #else | |
| 209 then = SDL_GetTicks(); | |
| 210 #endif | |
| 211 do { | |
| 212 errno = 0; | |
| 213 | |
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214 #if _POSIX_THREAD_SYSCALL_SOFT |
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215 pthread_yield_np(); |
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216 #endif |
| 0 | 217 #ifdef USE_NANOSLEEP |
| 218 tv.tv_sec = elapsed.tv_sec; | |
| 219 tv.tv_nsec = elapsed.tv_nsec; | |
| 220 was_error = nanosleep(&tv, &elapsed); | |
| 221 #else | |
| 222 #ifndef SELECT_SETS_REMAINING | |
| 223 /* Calculate the time interval left (in case of interrupt) */ | |
| 224 now = SDL_GetTicks(); | |
| 225 elapsed = (now-then); | |
| 226 then = now; | |
| 227 if ( elapsed >= ms ) { | |
| 228 break; | |
| 229 } | |
| 230 ms -= elapsed; | |
| 231 tv.tv_sec = ms/1000; | |
| 232 tv.tv_usec = (ms%1000)*1000; | |
| 233 #endif | |
| 234 was_error = select(0, NULL, NULL, NULL, &tv); | |
| 235 #endif /* USE_NANOSLEEP */ | |
| 236 } while ( was_error && (errno == EINTR) ); | |
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237 #endif /* ENABLE_PTH */ |
| 0 | 238 } |
| 239 | |
| 240 #ifdef USE_ITIMER | |
| 241 | |
| 242 static void HandleAlarm(int sig) | |
| 243 { | |
| 244 Uint32 ms; | |
| 245 | |
| 246 if ( SDL_alarm_callback ) { | |
| 247 ms = (*SDL_alarm_callback)(SDL_alarm_interval); | |
| 248 if ( ms != SDL_alarm_interval ) { | |
| 249 SDL_SetTimer(ms, SDL_alarm_callback); | |
| 250 } | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 int SDL_SYS_TimerInit(void) | |
| 255 { | |
| 256 struct sigaction action; | |
| 257 | |
| 258 /* Set the alarm handler (Linux specific) */ | |
| 259 memset(&action, 0, sizeof(action)); | |
| 260 action.sa_handler = HandleAlarm; | |
| 261 action.sa_flags = SA_RESTART; | |
| 262 sigemptyset(&action.sa_mask); | |
| 263 sigaction(SIGALRM, &action, NULL); | |
| 264 return(0); | |
| 265 } | |
| 266 | |
| 267 void SDL_SYS_TimerQuit(void) | |
| 268 { | |
| 269 SDL_SetTimer(0, NULL); | |
| 270 } | |
| 271 | |
| 272 int SDL_SYS_StartTimer(void) | |
| 273 { | |
| 274 struct itimerval timer; | |
| 275 | |
| 276 timer.it_value.tv_sec = (SDL_alarm_interval/1000); | |
| 277 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 278 timer.it_interval.tv_sec = (SDL_alarm_interval/1000); | |
| 279 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000; | |
| 280 setitimer(ITIMER_REAL, &timer, NULL); | |
| 281 return(0); | |
| 282 } | |
| 283 | |
| 284 void SDL_SYS_StopTimer(void) | |
| 285 { | |
| 286 struct itimerval timer; | |
| 287 | |
| 288 memset(&timer, 0, (sizeof timer)); | |
| 289 setitimer(ITIMER_REAL, &timer, NULL); | |
| 290 } | |
| 291 | |
| 292 #else /* USE_ITIMER */ | |
| 293 | |
| 294 #include "SDL_thread.h" | |
| 295 | |
| 296 /* Data to handle a single periodic alarm */ | |
| 297 static int timer_alive = 0; | |
| 298 static SDL_Thread *timer = NULL; | |
| 299 | |
| 300 static int RunTimer(void *unused) | |
| 301 { | |
| 302 while ( timer_alive ) { | |
| 303 if ( SDL_timer_running ) { | |
| 304 SDL_ThreadedTimerCheck(); | |
| 305 } | |
| 306 SDL_Delay(1); | |
| 307 } | |
| 308 return(0); | |
| 309 } | |
| 310 | |
| 311 /* This is only called if the event thread is not running */ | |
| 312 int SDL_SYS_TimerInit(void) | |
| 313 { | |
| 314 timer_alive = 1; | |
| 315 timer = SDL_CreateThread(RunTimer, NULL); | |
| 316 if ( timer == NULL ) | |
| 317 return(-1); | |
| 318 return(SDL_SetTimerThreaded(1)); | |
| 319 } | |
| 320 | |
| 321 void SDL_SYS_TimerQuit(void) | |
| 322 { | |
| 323 timer_alive = 0; | |
| 324 if ( timer ) { | |
| 325 SDL_WaitThread(timer, NULL); | |
| 326 timer = NULL; | |
| 327 } | |
| 328 } | |
| 329 | |
| 330 int SDL_SYS_StartTimer(void) | |
| 331 { | |
| 332 SDL_SetError("Internal logic error: Linux uses threaded timer"); | |
| 333 return(-1); | |
| 334 } | |
| 335 | |
| 336 void SDL_SYS_StopTimer(void) | |
| 337 { | |
| 338 return; | |
| 339 } | |
| 340 | |
| 341 #endif /* USE_ITIMER */ |