1 | // -*- C++ -*- |
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2 | |
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3 | /* |
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4 | |
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5 | Heap Layers: An Extensible Memory Allocation Infrastructure |
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6 | |
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7 | Copyright (C) 2000-2003 by Emery Berger |
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8 | http://www.cs.umass.edu/~emery |
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9 | emery@cs.umass.edu |
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10 | |
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11 | This program is free software; you can redistribute it and/or modify |
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12 | it under the terms of the GNU General Public License as published by |
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13 | the Free Software Foundation; either version 2 of the License, or |
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14 | (at your option) any later version. |
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15 | |
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16 | This program is distributed in the hope that it will be useful, |
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17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 | GNU General Public License for more details. |
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20 | |
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21 | You should have received a copy of the GNU General Public License |
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22 | along with this program; if not, write to the Free Software |
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23 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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24 | |
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25 | */ |
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26 | |
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27 | |
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28 | |
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29 | #ifndef _CPUINFO_H_ |
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30 | #define _CPUINFO_H_ |
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31 | |
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32 | #if defined(_WIN32) |
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33 | #include <windows.h> |
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34 | #include <process.h> |
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35 | #else |
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36 | #include <unistd.h> |
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37 | #endif |
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38 | |
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39 | |
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40 | #if !defined(_WIN32) |
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41 | #include <pthread.h> |
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42 | #endif |
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43 | |
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44 | #if defined(__SVR4) // Solaris |
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45 | #include <sys/lwp.h> |
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46 | extern "C" unsigned int lwp_self(void); |
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47 | #include <thread.h> |
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48 | extern "C" int _thr_self(void); |
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49 | #endif |
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50 | |
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51 | #if defined(__linux) |
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52 | #include <sys/types.h> |
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53 | #include <sys/stat.h> |
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54 | #include <fcntl.h> |
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55 | #include <string.h> |
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56 | #include <unistd.h> |
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57 | #endif |
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58 | |
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59 | #if defined(__APPLE__) |
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60 | #include <sys/types.h> |
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61 | #include <sys/sysctl.h> |
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62 | #endif |
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63 | |
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64 | #if defined(__sgi) |
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65 | #include <sys/types.h> |
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66 | #include <sys/sysmp.h> |
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67 | #include <sys/sysinfo.h> |
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68 | #endif |
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69 | |
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70 | #if defined(hpux) |
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71 | #include <sys/mpctl.h> |
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72 | #endif |
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73 | |
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74 | #if defined(_WIN32) |
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75 | extern __declspec(thread) int localThreadId; |
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76 | #endif |
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77 | |
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78 | #if defined(__SVR4) && defined(MAP_ALIGN) |
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79 | extern volatile int anyThreadStackCreated; |
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80 | #endif |
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81 | |
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82 | namespace HL { |
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83 | |
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84 | /** |
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85 | * @class CPUInfo |
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86 | * @author Emery Berger <http://www.cs.umass.edu/~emery> |
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87 | * |
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88 | * @brief Architecture-independent wrapper to get number of CPUs. |
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89 | */ |
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90 | |
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91 | class CPUInfo { |
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92 | public: |
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93 | CPUInfo (void) |
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94 | {} |
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95 | |
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96 | inline static int getNumProcessors (void) { |
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97 | static int _numProcessors = computeNumProcessors(); |
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98 | return _numProcessors; |
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99 | } |
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100 | |
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101 | static inline int getThreadId (void); |
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102 | inline static int computeNumProcessors (void); |
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103 | |
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104 | }; |
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105 | |
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106 | |
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107 | int CPUInfo::computeNumProcessors (void) |
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108 | { |
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109 | static int np = 0; |
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110 | if (!np) { |
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111 | #if defined(__linux) |
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112 | // Ugly workaround. Linux's sysconf indirectly calls malloc() (at |
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113 | // least on multiprocessors). So we just read the info from the |
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114 | // proc file ourselves and count the occurrences of the word |
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115 | // "processor". |
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116 | |
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117 | // We only parse the first 32K of the CPU file. By my estimates, |
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118 | // that should be more than enough for at least 64 processors. |
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119 | enum { MAX_PROCFILE_SIZE = 32768 }; |
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120 | char line[MAX_PROCFILE_SIZE]; |
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121 | int fd = open ("/proc/cpuinfo", O_RDONLY); |
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122 | if (!fd) { |
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123 | return 1; |
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124 | } else { |
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125 | read (fd, line, MAX_PROCFILE_SIZE); |
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126 | char * str = line; |
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127 | np = 0; |
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128 | while (str) { |
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129 | str = strstr(str, "processor"); |
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130 | if (str) { |
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131 | np++; |
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132 | str++; |
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133 | } |
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134 | } |
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135 | close (fd); |
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136 | return np; |
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137 | } |
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138 | #elif defined(_WIN32) |
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139 | SYSTEM_INFO infoReturn[1]; |
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140 | GetSystemInfo (infoReturn); |
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141 | np = (int) (infoReturn->dwNumberOfProcessors); |
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142 | return np; |
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143 | #elif defined(__sgi) |
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144 | np = (int) sysmp(MP_NAPROCS); |
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145 | return np; |
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146 | #elif defined(hpux) |
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147 | np = mpctl(MPC_GETNUMSPUS, NULL, NULL); // or pthread_num_processors_np()? |
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148 | return np; |
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149 | #elif defined(_SC_NPROCESSORS_ONLN) |
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150 | np = (int) (sysconf(_SC_NPROCESSORS_ONLN)); |
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151 | return np; |
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152 | #elif defined(__APPLE__) |
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153 | size_t size = sizeof( np ); |
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154 | int name[] = { CTL_HW, HW_NCPU }; |
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155 | if ( ::sysctl( name, 2, & np, & size, 0, 0 ) || |
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156 | ( size != sizeof( np ) ) ) { |
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157 | np = 2; |
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158 | } |
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159 | return np; |
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160 | #else |
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161 | np = 2; |
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162 | // Unsupported platform. |
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163 | // Pretend we have at least two processors. This approach avoids the risk of assuming |
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164 | // we're on a uniprocessor, which might lead clever allocators to avoid using atomic |
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165 | // operations for all locks. |
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166 | return np; |
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167 | #endif |
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168 | } else { |
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169 | return np; |
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170 | } |
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171 | } |
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172 | |
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173 | // Note: when stacksize arg is NULL for pthread_attr_setstacksize [Solaris], |
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174 | // stack size is 1 MB for 32-bit arch, 2 MB for 64-bit arch. |
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175 | // pthread_attr_getstacksize |
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176 | // pthread_attr_setstackaddr |
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177 | // pthread_attr_getstackaddr |
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178 | // PTHREAD_STACK_SIZE is minimum. |
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179 | // or should we just assume we have __declspec(thread) or __thread? |
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180 | |
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181 | #if defined(USE_THREAD_KEYWORD) |
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182 | extern __thread int localThreadId; |
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183 | #endif |
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184 | |
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185 | |
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186 | int CPUInfo::getThreadId (void) { |
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187 | #if defined(__SVR4) |
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188 | size_t THREAD_STACK_SIZE; |
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189 | if (sizeof(size_t) <= 4) { |
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190 | THREAD_STACK_SIZE = 1048576; |
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191 | } else { |
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192 | // 64-bits. |
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193 | THREAD_STACK_SIZE = 1048576 * 2; |
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194 | } |
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195 | if (0) { // !anyThreadStackCreated) { |
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196 | // We know a priori that all stack variables |
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197 | // are on different stacks. Since no one has created |
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198 | // a special one, we are in control, and thus all stacks |
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199 | // are 1 MB in size and on 1 MB boundaries. |
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200 | // (Actually: 1 MB for 32-bits, 2 MB for 64-bits.) |
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201 | char buf; |
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202 | return (((size_t) &buf) & ~(THREAD_STACK_SIZE-1)) >> 20; |
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203 | } else { |
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204 | return (int) pthread_self(); |
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205 | } |
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206 | #elif defined(_WIN32) |
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207 | // It looks like thread id's are always multiples of 4, so... |
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208 | return GetCurrentThreadId() >> 2; |
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209 | #elif defined(__BEOS__) |
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210 | return find_thread(0); |
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211 | #elif defined(USE_THREAD_KEYWORD) |
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212 | return localThreadId; |
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213 | #elif defined(__linux) || defined(PTHREAD_KEYS_MAX) |
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214 | // Consecutive thread id's in Linux are 1024 apart; |
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215 | // dividing off the 1024 gives us an appropriate thread id. |
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216 | return (int) pthread_self() >> 10; // >> 20; // FIX ME 10 // (>> 10 = / 1024) |
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217 | #elif defined(POSIX) // FIX ME?? |
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218 | return (int) pthread_self(); |
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219 | #elif USE_SPROC |
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220 | // This hairiness has the same effect as calling getpid(), |
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221 | // but it's MUCH faster since it avoids making a system call |
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222 | // and just accesses the sproc-local data directly. |
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223 | int pid = (int) PRDA->sys_prda.prda_sys.t_pid; |
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224 | return pid; |
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225 | #else |
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226 | return 0; |
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227 | #endif |
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228 | } |
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229 | |
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230 | } |
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231 | |
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232 | #endif |
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