Mercurial > sdl-ios-xcode
annotate src/timer/linux/SDL_systimer.c @ 1199:2d6dc7de1145
From: Mike Frysinger <vapier@gentoo.org>
To: sdl@libsdl.org
Date: Sun, 11 Dec 2005 22:57:37 -0500
Subject: [SDL] exec stack in libsdl update
i posted back in September a patch to remove executable stacks:
http://www.devolution.com/pipermail/sdl/2005-September/070626.html
later in November, a similar patch was merged it seems:
http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm
however, this lacks the additional output format checks that i posted in my
patch ... this isnt a problem if the hermes asm code is only ever used to
produce ELF objects, but if this is not true, then the additional checks in
my original patch will need to be merged
-mike
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 12 Dec 2005 09:13:12 +0000 |
| parents | ec446adf8cb2 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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 */ |