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annotate src/timeout.c @ 4:f0a27ccb1193 tip

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Added ignore file
author Eric Wing <ewing . public |-at-| gmail . com>
date Sat, 30 Aug 2008 08:46:39 -0700
parents 4b915342e2a8
children
rev   line source
0
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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1 /*=========================================================================*\
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2 * Timeout management functions
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3 * LuaSocket toolkit
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4 *
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5 * RCS ID: $Id: timeout.c,v 1.30 2005/10/07 04:40:59 diego Exp $
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6 \*=========================================================================*/
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7 #include <stdio.h>
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8
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9 #include "lua.h"
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10 #include "lauxlib.h"
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11
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12 #include "auxiliar.h"
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13 #include "timeout.h"
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14
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15 #ifdef _WIN32
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16 #include <windows.h>
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17 #else
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18 #include <time.h>
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19 #include <sys/time.h>
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20 #endif
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21
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22 /* min and max macros */
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23 #ifndef MIN
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24 #define MIN(x, y) ((x) < (y) ? x : y)
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25 #endif
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26 #ifndef MAX
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27 #define MAX(x, y) ((x) > (y) ? x : y)
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28 #endif
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29
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30 /*=========================================================================*\
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31 * Internal function prototypes
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32 \*=========================================================================*/
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33 static int timeout_lua_gettime(lua_State *L);
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34 static int timeout_lua_sleep(lua_State *L);
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35
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36 static luaL_reg func[] = {
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37 { "gettime", timeout_lua_gettime },
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38 { "sleep", timeout_lua_sleep },
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39 { NULL, NULL }
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40 };
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41
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42 /*=========================================================================*\
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43 * Exported functions.
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44 \*=========================================================================*/
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45 /*-------------------------------------------------------------------------*\
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46 * Initialize structure
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47 \*-------------------------------------------------------------------------*/
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48 void timeout_init(p_timeout tm, double block, double total) {
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49 tm->block = block;
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50 tm->total = total;
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51 }
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52
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53 /*-------------------------------------------------------------------------*\
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54 * Determines how much time we have left for the next system call,
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55 * if the previous call was successful
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56 * Input
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57 * tm: timeout control structure
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58 * Returns
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59 * the number of ms left or -1 if there is no time limit
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60 \*-------------------------------------------------------------------------*/
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61 double timeout_get(p_timeout tm) {
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62 if (tm->block < 0.0 && tm->total < 0.0) {
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63 return -1;
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64 } else if (tm->block < 0.0) {
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65 double t = tm->total - timeout_gettime() + tm->start;
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66 return MAX(t, 0.0);
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67 } else if (tm->total < 0.0) {
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68 return tm->block;
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69 } else {
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70 double t = tm->total - timeout_gettime() + tm->start;
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71 return MIN(tm->block, MAX(t, 0.0));
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72 }
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73 }
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74
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75 /*-------------------------------------------------------------------------*\
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76 * Returns time since start of operation
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77 * Input
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78 * tm: timeout control structure
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79 * Returns
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80 * start field of structure
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81 \*-------------------------------------------------------------------------*/
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82 double timeout_getstart(p_timeout tm) {
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83 return tm->start;
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84 }
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85
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86 /*-------------------------------------------------------------------------*\
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87 * Determines how much time we have left for the next system call,
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88 * if the previous call was a failure
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89 * Input
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90 * tm: timeout control structure
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91 * Returns
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92 * the number of ms left or -1 if there is no time limit
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93 \*-------------------------------------------------------------------------*/
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94 double timeout_getretry(p_timeout tm) {
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95 if (tm->block < 0.0 && tm->total < 0.0) {
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96 return -1;
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97 } else if (tm->block < 0.0) {
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98 double t = tm->total - timeout_gettime() + tm->start;
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99 return MAX(t, 0.0);
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100 } else if (tm->total < 0.0) {
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101 double t = tm->block - timeout_gettime() + tm->start;
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102 return MAX(t, 0.0);
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103 } else {
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104 double t = tm->total - timeout_gettime() + tm->start;
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105 return MIN(tm->block, MAX(t, 0.0));
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106 }
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107 }
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108
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109 /*-------------------------------------------------------------------------*\
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110 * Marks the operation start time in structure
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111 * Input
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112 * tm: timeout control structure
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113 \*-------------------------------------------------------------------------*/
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114 p_timeout timeout_markstart(p_timeout tm) {
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115 tm->start = timeout_gettime();
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116 return tm;
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117 }
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118
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119 /*-------------------------------------------------------------------------*\
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120 * Gets time in s, relative to January 1, 1970 (UTC)
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121 * Returns
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122 * time in s.
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123 \*-------------------------------------------------------------------------*/
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124 #ifdef _WIN32
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125 double timeout_gettime(void) {
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126 FILETIME ft;
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127 double t;
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128 GetSystemTimeAsFileTime(&ft);
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129 /* Windows file time (time since January 1, 1601 (UTC)) */
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130 t = ft.dwLowDateTime/1.0e7 + ft.dwHighDateTime*(4294967296.0/1.0e7);
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131 /* convert to Unix Epoch time (time since January 1, 1970 (UTC)) */
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132 return (t - 11644473600.0);
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133 }
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134 #else
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135 double timeout_gettime(void) {
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136 struct timeval v;
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137 gettimeofday(&v, (struct timezone *) NULL);
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138 /* Unix Epoch time (time since January 1, 1970 (UTC)) */
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139 return v.tv_sec + v.tv_usec/1.0e6;
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140 }
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141 #endif
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142
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143 /*-------------------------------------------------------------------------*\
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144 * Initializes module
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145 \*-------------------------------------------------------------------------*/
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146 int timeout_open(lua_State *L) {
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147 luaL_openlib(L, NULL, func, 0);
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148 return 0;
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149 }
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150
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151 /*-------------------------------------------------------------------------*\
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152 * Sets timeout values for IO operations
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153 * Lua Input: base, time [, mode]
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154 * time: time out value in seconds
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155 * mode: "b" for block timeout, "t" for total timeout. (default: b)
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156 \*-------------------------------------------------------------------------*/
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157 int timeout_meth_settimeout(lua_State *L, p_timeout tm) {
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158 double t = luaL_optnumber(L, 2, -1);
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159 const char *mode = luaL_optstring(L, 3, "b");
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160 switch (*mode) {
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161 case 'b':
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162 tm->block = t;
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163 break;
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164 case 'r': case 't':
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165 tm->total = t;
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166 break;
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167 default:
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168 luaL_argcheck(L, 0, 3, "invalid timeout mode");
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169 break;
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170 }
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171 lua_pushnumber(L, 1);
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172 return 1;
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173 }
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174
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175 /*=========================================================================*\
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176 * Test support functions
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177 \*=========================================================================*/
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178 /*-------------------------------------------------------------------------*\
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179 * Returns the time the system has been up, in secconds.
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180 \*-------------------------------------------------------------------------*/
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181 static int timeout_lua_gettime(lua_State *L)
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182 {
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183 lua_pushnumber(L, timeout_gettime());
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184 return 1;
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185 }
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186
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187 /*-------------------------------------------------------------------------*\
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188 * Sleep for n seconds.
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189 \*-------------------------------------------------------------------------*/
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190 int timeout_lua_sleep(lua_State *L)
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191 {
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192 double n = luaL_checknumber(L, 1);
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193 #ifdef _WIN32
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194 Sleep((int)(n*1000));
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195 #else
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196 struct timespec t, r;
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197 t.tv_sec = (int) n;
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198 n -= t.tv_sec;
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199 t.tv_nsec = (int) (n * 1000000000);
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200 if (t.tv_nsec >= 1000000000) t.tv_nsec = 999999999;
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201 while (nanosleep(&t, &r) != 0) {
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202 t.tv_sec = r.tv_sec;
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203 t.tv_nsec = r.tv_nsec;
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204 }
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205 #endif
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206 return 0;
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207 }