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
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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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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 #include <stdio.h>
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26 #include <sys/time.h>
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27 #include <signal.h>
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28 #include <unistd.h>
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29 #include <string.h>
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30 #include <errno.h>
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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
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48 #include "SDL_error.h"
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49 #include "SDL_timer.h"
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50 #include "SDL_timer_c.h"
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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
1
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58
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59 #if defined(DISABLE_THREADS) || defined(FORK_HACK)
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60 #define USE_ITIMER
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61 #endif
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62
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63 /* The following defines should really be determined at configure time */
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64
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65 #if defined(linux)
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66 /* Linux select() changes its timeout parameter upon return to contain
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67 the remaining time. Most other unixen leave it unchanged or undefined. */
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68 #define SELECT_SETS_REMAINING
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69 #elif defined(__bsdi__) || defined(__FreeBSD__) || defined(__sun) || defined(MACOSX)
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70 #define USE_NANOSLEEP
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71 #endif
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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
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132
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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
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137 static struct timeval start;
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138 #endif /* USE_CLOCK_GETTIME */
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139
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140 #endif /* USE_RDTSC */
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141
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142
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143 void SDL_StartTicks(void)
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144 {
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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
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154 gettimeofday(&start, NULL);
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155 #endif
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156 }
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157
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158 Uint32 SDL_GetTicks (void)
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159 {
316
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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;
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175 struct timeval now;
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176 gettimeofday(&now, NULL);
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177 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
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178 return(ticks);
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179 #endif
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180 }
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181
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182 void SDL_Delay (Uint32 ms)
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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
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190 int was_error;
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191
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192 #ifdef USE_NANOSLEEP
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193 struct timespec elapsed, tv;
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194 #else
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195 struct timeval tv;
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196 #ifndef SELECT_SETS_REMAINING
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197 Uint32 then, now, elapsed;
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198 #endif
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199 #endif
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200
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201 /* Set the timeout interval - Linux only needs to do this once */
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202 #ifdef SELECT_SETS_REMAINING
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203 tv.tv_sec = ms/1000;
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204 tv.tv_usec = (ms%1000)*1000;
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205 #elif defined(USE_NANOSLEEP)
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206 elapsed.tv_sec = ms/1000;
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207 elapsed.tv_nsec = (ms%1000)*1000000;
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208 #else
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209 then = SDL_GetTicks();
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210 #endif
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211 do {
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212 errno = 0;
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213
1
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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
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217 #ifdef USE_NANOSLEEP
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218 tv.tv_sec = elapsed.tv_sec;
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219 tv.tv_nsec = elapsed.tv_nsec;
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220 was_error = nanosleep(&tv, &elapsed);
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221 #else
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222 #ifndef SELECT_SETS_REMAINING
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223 /* Calculate the time interval left (in case of interrupt) */
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224 now = SDL_GetTicks();
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225 elapsed = (now-then);
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226 then = now;
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227 if ( elapsed >= ms ) {
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228 break;
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229 }
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230 ms -= elapsed;
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231 tv.tv_sec = ms/1000;
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232 tv.tv_usec = (ms%1000)*1000;
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233 #endif
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234 was_error = select(0, NULL, NULL, NULL, &tv);
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235 #endif /* USE_NANOSLEEP */
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236 } while ( was_error && (errno == EINTR) );
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237 #endif /* ENABLE_PTH */
0
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238 }
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239
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240 #ifdef USE_ITIMER
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241
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242 static void HandleAlarm(int sig)
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243 {
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244 Uint32 ms;
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245
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246 if ( SDL_alarm_callback ) {
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247 ms = (*SDL_alarm_callback)(SDL_alarm_interval);
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248 if ( ms != SDL_alarm_interval ) {
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249 SDL_SetTimer(ms, SDL_alarm_callback);
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250 }
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251 }
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252 }
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253
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254 int SDL_SYS_TimerInit(void)
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255 {
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256 struct sigaction action;
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257
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258 /* Set the alarm handler (Linux specific) */
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259 memset(&action, 0, sizeof(action));
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260 action.sa_handler = HandleAlarm;
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261 action.sa_flags = SA_RESTART;
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262 sigemptyset(&action.sa_mask);
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263 sigaction(SIGALRM, &action, NULL);
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264 return(0);
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265 }
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266
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267 void SDL_SYS_TimerQuit(void)
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268 {
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269 SDL_SetTimer(0, NULL);
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270 }
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271
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272 int SDL_SYS_StartTimer(void)
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273 {
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274 struct itimerval timer;
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275
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276 timer.it_value.tv_sec = (SDL_alarm_interval/1000);
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277 timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000;
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278 timer.it_interval.tv_sec = (SDL_alarm_interval/1000);
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279 timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000;
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280 setitimer(ITIMER_REAL, &timer, NULL);
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281 return(0);
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282 }
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283
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284 void SDL_SYS_StopTimer(void)
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285 {
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286 struct itimerval timer;
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287
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288 memset(&timer, 0, (sizeof timer));
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289 setitimer(ITIMER_REAL, &timer, NULL);
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290 }
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291
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292 #else /* USE_ITIMER */
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293
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294 #include "SDL_thread.h"
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295
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296 /* Data to handle a single periodic alarm */
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297 static int timer_alive = 0;
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298 static SDL_Thread *timer = NULL;
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299
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300 static int RunTimer(void *unused)
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301 {
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302 while ( timer_alive ) {
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303 if ( SDL_timer_running ) {
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304 SDL_ThreadedTimerCheck();
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305 }
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306 SDL_Delay(1);
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307 }
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308 return(0);
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309 }
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310
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311 /* This is only called if the event thread is not running */
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312 int SDL_SYS_TimerInit(void)
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313 {
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314 timer_alive = 1;
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315 timer = SDL_CreateThread(RunTimer, NULL);
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316 if ( timer == NULL )
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317 return(-1);
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318 return(SDL_SetTimerThreaded(1));
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319 }
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320
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321 void SDL_SYS_TimerQuit(void)
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322 {
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323 timer_alive = 0;
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324 if ( timer ) {
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325 SDL_WaitThread(timer, NULL);
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326 timer = NULL;
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327 }
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328 }
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329
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330 int SDL_SYS_StartTimer(void)
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331 {
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332 SDL_SetError("Internal logic error: Linux uses threaded timer");
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333 return(-1);
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334 }
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335
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336 void SDL_SYS_StopTimer(void)
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337 {
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338 return;
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339 }
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340
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341 #endif /* USE_ITIMER */