annotate src/timer/linux/SDL_systimer.c @ 1156:8521404a33c7

Date: Tue, 11 Oct 2005 16:58:12 +0300 (EEST) From: =?ISO-8859-1?Q?Martin_Storsj=F6?= <martin@martin.st> To: sdl@libsdl.org Subject: [SDL] [PATCH] Use nanosleep on OS X Hi, The current version of SDL_Delay on OS X seems to always sleep at least 10 msec. OS X has nanosleep(), which performs shorter sleeps well. The attached patch makes it use that one instead of select() as currently. // Martin
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 11 Oct 2005 17:33:03 +0000
parents b8d311d90021
children baf35853ad54
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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@libsdl.org
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21
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22 RDTSC stuff by lompik (lompik@voila.fr) 20/03/2002
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23 */
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24
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25 #ifdef SAVE_RCSID
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26 static char rcsid =
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27 "@(#) $Id$";
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28 #endif
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29
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30 #include <stdio.h>
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31 #include <sys/time.h>
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32 #include <signal.h>
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33 #include <unistd.h>
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34 #include <string.h>
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35 #include <errno.h>
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36
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37 #include "SDL_error.h"
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38 #include "SDL_timer.h"
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39 #include "SDL_timer_c.h"
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40
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41 #if _POSIX_THREAD_SYSCALL_SOFT
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42 #include <pthread.h>
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43 #endif
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44 #ifdef ENABLE_PTH
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45 #include <pth.h>
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46 #endif
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47
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48 #if defined(DISABLE_THREADS) || defined(FORK_HACK)
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49 #define USE_ITIMER
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50 #endif
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51
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52 /* The following defines should really be determined at configure time */
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53
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54 #if defined(linux)
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55 /* Linux select() changes its timeout parameter upon return to contain
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56 the remaining time. Most other unixen leave it unchanged or undefined. */
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57 #define SELECT_SETS_REMAINING
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58 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun) || defined(MACOSX)
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59 #define USE_NANOSLEEP
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60 #endif
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61
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62 #if defined(i386) || defined(__i386__)
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63 /* This only works on pentium or newer x86 processors */
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64 /* Actually, this isn't reliable on multi-cpu systems, so is disabled */
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65 /*#define USE_RDTSC*/
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66 #endif
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67
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68
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69 #ifdef USE_RDTSC
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70
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71 /* The first ticks value of the application */
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72 static unsigned long long start;
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73 static float cpu_mhz1000 = 0.0f;
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74
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75 #if 1
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76 /* This is for old binutils version that don't recognize rdtsc mnemonics.
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77 But all binutils version supports this.
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78 */
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79 #define rdtsc(t) asm __volatile__ (".byte 0x0f, 0x31; " : "=A" (t))
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80 #else
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81 #define rdtsc(t) asm __volatile__ ("rdtsc" : "=A" (t))
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82 #endif
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83
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84 static float calc_cpu_mhz(void)
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85 {
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86 float cpu_mhz;
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87 unsigned long long tsc_start;
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88 unsigned long long tsc_end;
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89 struct timeval tv_start, tv_end;
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90 long usec_delay;
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91
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92 rdtsc(tsc_start);
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93 gettimeofday(&tv_start, NULL);
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94 sleep(1);
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95 rdtsc(tsc_end);
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96 gettimeofday(&tv_end, NULL);
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97 usec_delay = 1000000L * (tv_end.tv_sec - tv_start.tv_sec) +
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98 (tv_end.tv_usec - tv_start.tv_usec);
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99 cpu_mhz = (float)(tsc_end-tsc_start) / usec_delay;
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100 #if 0
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101 printf("cpu MHz\t\t: %.3f\n", cpu_mhz);
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102 #endif
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103 return cpu_mhz;
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104 }
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105
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106 #else
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107
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108 /* The first ticks value of the application */
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109 static struct timeval start;
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110
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111 #endif /* USE_RDTSC */
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112
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113
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114 void SDL_StartTicks(void)
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115 {
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116 /* Set first ticks value */
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117 #ifdef USE_RDTSC
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118 if ( ! cpu_mhz1000 ) {
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119 cpu_mhz1000 = calc_cpu_mhz() * 1000.0f;
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120 }
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121 rdtsc(start);
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122 #else
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123 gettimeofday(&start, NULL);
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124 #endif /* USE_RDTSC */
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125 }
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126
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127 Uint32 SDL_GetTicks (void)
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128 {
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129 #ifdef USE_RDTSC
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130 unsigned long long now;
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131 if ( ! cpu_mhz1000 ) {
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132 return 0; /* Shouldn't happen. BUG!! */
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133 }
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134 rdtsc(now);
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135 return (Uint32)((now-start)/cpu_mhz1000);
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136 #else
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137 struct timeval now;
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138 Uint32 ticks;
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139
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140 gettimeofday(&now, NULL);
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141 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
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142 return(ticks);
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143 #endif /* USE_RDTSC */
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144 }
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145
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146 void SDL_Delay (Uint32 ms)
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147 {
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148 #ifdef ENABLE_PTH
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149 pth_time_t tv;
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150 tv.tv_sec = ms/1000;
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151 tv.tv_usec = (ms%1000)*1000;
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152 pth_nap(tv);
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153 #else
0
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154 int was_error;
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155
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156 #ifdef USE_NANOSLEEP
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157 struct timespec elapsed, tv;
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158 #else
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159 struct timeval tv;
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160 #ifndef SELECT_SETS_REMAINING
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161 Uint32 then, now, elapsed;
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162 #endif
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163 #endif
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164
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165 /* Set the timeout interval - Linux only needs to do this once */
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166 #ifdef SELECT_SETS_REMAINING
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167 tv.tv_sec = ms/1000;
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168 tv.tv_usec = (ms%1000)*1000;
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169 #elif defined(USE_NANOSLEEP)
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170 elapsed.tv_sec = ms/1000;
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171 elapsed.tv_nsec = (ms%1000)*1000000;
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172 #else
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173 then = SDL_GetTicks();
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174 #endif
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175 do {
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176 errno = 0;
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177
1
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178 #if _POSIX_THREAD_SYSCALL_SOFT
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179 pthread_yield_np();
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180 #endif
0
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181 #ifdef USE_NANOSLEEP
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182 tv.tv_sec = elapsed.tv_sec;
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183 tv.tv_nsec = elapsed.tv_nsec;
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184 was_error = nanosleep(&tv, &elapsed);
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185 #else
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186 #ifndef SELECT_SETS_REMAINING
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187 /* Calculate the time interval left (in case of interrupt) */
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188 now = SDL_GetTicks();
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189 elapsed = (now-then);
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190 then = now;
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191 if ( elapsed >= ms ) {
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192 break;
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193 }
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194 ms -= elapsed;
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195 tv.tv_sec = ms/1000;
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196 tv.tv_usec = (ms%1000)*1000;
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197 #endif
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198 was_error = select(0, NULL, NULL, NULL, &tv);
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199 #endif /* USE_NANOSLEEP */
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200 } while ( was_error && (errno == EINTR) );
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201 #endif /* ENABLE_PTH */
0
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202 }
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203
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204 #ifdef USE_ITIMER
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205
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206 static void HandleAlarm(int sig)
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207 {
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208 Uint32 ms;
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209
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210 if ( SDL_alarm_callback ) {
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211 ms = (*SDL_alarm_callback)(SDL_alarm_interval);
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212 if ( ms != SDL_alarm_interval ) {
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213 SDL_SetTimer(ms, SDL_alarm_callback);
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214 }
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215 }
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216 }
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217
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218 int SDL_SYS_TimerInit(void)
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219 {
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220 struct sigaction action;
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221
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222 /* Set the alarm handler (Linux specific) */
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223 memset(&action, 0, sizeof(action));
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224 action.sa_handler = HandleAlarm;
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225 action.sa_flags = SA_RESTART;
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226 sigemptyset(&action.sa_mask);
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227 sigaction(SIGALRM, &action, NULL);
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228 return(0);
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229 }
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230
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231 void SDL_SYS_TimerQuit(void)
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232 {
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233 SDL_SetTimer(0, NULL);
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234 }
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235
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236 int SDL_SYS_StartTimer(void)
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237 {
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238 struct itimerval timer;
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239
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240 timer.it_value.tv_sec = (SDL_alarm_interval/1000);
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241 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000;
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242 timer.it_interval.tv_sec = (SDL_alarm_interval/1000);
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243 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000;
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244 setitimer(ITIMER_REAL, &timer, NULL);
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245 return(0);
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246 }
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247
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248 void SDL_SYS_StopTimer(void)
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249 {
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250 struct itimerval timer;
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251
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252 memset(&timer, 0, (sizeof timer));
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253 setitimer(ITIMER_REAL, &timer, NULL);
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254 }
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255
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256 #else /* USE_ITIMER */
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257
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258 #include "SDL_thread.h"
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259
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260 /* Data to handle a single periodic alarm */
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261 static int timer_alive = 0;
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262 static SDL_Thread *timer = NULL;
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263
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264 static int RunTimer(void *unused)
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265 {
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266 while ( timer_alive ) {
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267 if ( SDL_timer_running ) {
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268 SDL_ThreadedTimerCheck();
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269 }
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270 SDL_Delay(1);
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271 }
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272 return(0);
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273 }
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274
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275 /* This is only called if the event thread is not running */
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276 int SDL_SYS_TimerInit(void)
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277 {
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278 timer_alive = 1;
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279 timer = SDL_CreateThread(RunTimer, NULL);
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280 if ( timer == NULL )
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281 return(-1);
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282 return(SDL_SetTimerThreaded(1));
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283 }
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284
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285 void SDL_SYS_TimerQuit(void)
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286 {
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287 timer_alive = 0;
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288 if ( timer ) {
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289 SDL_WaitThread(timer, NULL);
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290 timer = NULL;
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291 }
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292 }
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293
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294 int SDL_SYS_StartTimer(void)
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295 {
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296 SDL_SetError("Internal logic error: Linux uses threaded timer");
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297 return(-1);
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298 }
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299
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300 void SDL_SYS_StopTimer(void)
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301 {
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302 return;
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303 }
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304
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305 #endif /* USE_ITIMER */