1 | /* |
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2 | * tclThreadStorage.c -- |
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3 | * |
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4 | * This file implements platform independent thread storage operations. |
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5 | * |
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6 | * Copyright (c) 2003-2004 by Joe Mistachkin |
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7 | * |
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8 | * See the file "license.terms" for information on usage and redistribution of |
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9 | * this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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10 | * |
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11 | * RCS: @(#) $Id: tclThreadStorage.c,v 1.15 2007/12/13 15:23:20 dgp Exp $ |
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12 | */ |
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13 | |
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14 | #include "tclInt.h" |
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15 | |
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16 | #if defined(TCL_THREADS) |
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17 | |
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18 | /* |
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19 | * This is the thread storage cache array and it's accompanying mutex. The |
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20 | * elements are pairs of thread Id and an associated hash table pointer; the |
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21 | * hash table being pointed to contains the thread storage for it's associated |
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22 | * thread. The purpose of this cache is to minimize the number of hash table |
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23 | * lookups in the master thread storage hash table. |
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24 | */ |
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25 | |
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26 | static Tcl_Mutex threadStorageLock; |
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27 | |
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28 | /* |
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29 | * This is the struct used for a thread storage cache slot. It contains the |
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30 | * owning thread Id and the associated hash table pointer. |
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31 | */ |
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32 | |
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33 | typedef struct ThreadStorage { |
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34 | Tcl_ThreadId id; /* the owning thread id */ |
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35 | Tcl_HashTable *hashTablePtr;/* the hash table for the thread */ |
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36 | } ThreadStorage; |
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37 | |
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38 | /* |
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39 | * These are the prototypes for the custom hash table allocation functions |
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40 | * used by the thread storage subsystem. |
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41 | */ |
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42 | |
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43 | static Tcl_HashEntry * AllocThreadStorageEntry(Tcl_HashTable *tablePtr, |
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44 | void *keyPtr); |
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45 | static void FreeThreadStorageEntry(Tcl_HashEntry *hPtr); |
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46 | static Tcl_HashTable * ThreadStorageGetHashTable(Tcl_ThreadId id); |
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47 | |
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48 | /* |
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49 | * This is the hash key type for thread storage. We MUST use this in |
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50 | * combination with the new hash key type flag TCL_HASH_KEY_SYSTEM_HASH |
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51 | * because these hash tables MAY be used by the threaded memory allocator. |
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52 | */ |
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53 | |
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54 | static Tcl_HashKeyType tclThreadStorageHashKeyType = { |
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55 | TCL_HASH_KEY_TYPE_VERSION, /* version */ |
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56 | TCL_HASH_KEY_SYSTEM_HASH | TCL_HASH_KEY_RANDOMIZE_HASH, |
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57 | /* flags */ |
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58 | NULL, /* hashKeyProc */ |
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59 | NULL, /* compareKeysProc */ |
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60 | AllocThreadStorageEntry, /* allocEntryProc */ |
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61 | FreeThreadStorageEntry /* freeEntryProc */ |
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62 | }; |
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63 | |
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64 | /* |
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65 | * This is an invalid thread value. |
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66 | */ |
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67 | |
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68 | #define STORAGE_INVALID_THREAD (Tcl_ThreadId)0 |
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69 | |
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70 | /* |
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71 | * This is the value for an invalid thread storage key. |
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72 | */ |
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73 | |
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74 | #define STORAGE_INVALID_KEY 0 |
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75 | |
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76 | /* |
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77 | * This is the first valid key for use by external callers. All the values |
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78 | * below this are RESERVED for future use. |
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79 | */ |
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80 | |
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81 | #define STORAGE_FIRST_KEY 1 |
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82 | |
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83 | /* |
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84 | * This is the default number of thread storage cache slots. This define may |
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85 | * need to be fine tuned for maximum performance. |
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86 | */ |
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87 | |
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88 | #define STORAGE_CACHE_SLOTS 97 |
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89 | |
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90 | /* |
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91 | * This is the master thread storage hash table. It is keyed on thread Id and |
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92 | * contains values that are hash tables for each thread. The thread specific |
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93 | * hash tables contain the actual thread storage. |
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94 | */ |
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95 | |
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96 | static Tcl_HashTable threadStorageHashTable; |
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97 | |
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98 | /* |
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99 | * This is the next thread data key value to use. We increment this everytime |
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100 | * we "allocate" one. It is initially set to 1 in TclInitThreadStorage. |
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101 | */ |
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102 | |
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103 | static int nextThreadStorageKey = STORAGE_INVALID_KEY; |
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104 | |
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105 | /* |
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106 | * This is the master thread storage cache. Per Kevin Kenny's idea, this |
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107 | * prevents unnecessary lookups for threads that use a lot of thread storage. |
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108 | */ |
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109 | |
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110 | static volatile ThreadStorage threadStorageCache[STORAGE_CACHE_SLOTS]; |
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111 | |
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112 | /* |
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113 | *---------------------------------------------------------------------- |
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114 | * |
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115 | * AllocThreadStorageEntry -- |
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116 | * |
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117 | * Allocate space for a Tcl_HashEntry using TclpSysAlloc (not ckalloc). |
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118 | * We do this because the threaded memory allocator MAY use the thread |
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119 | * storage hash tables. |
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120 | * |
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121 | * Results: |
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122 | * The return value is a pointer to the created entry. |
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123 | * |
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124 | * Side effects: |
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125 | * None. |
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126 | * |
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127 | *---------------------------------------------------------------------- |
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128 | */ |
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129 | |
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130 | static Tcl_HashEntry * |
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131 | AllocThreadStorageEntry( |
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132 | Tcl_HashTable *tablePtr, /* Hash table. */ |
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133 | void *keyPtr) /* Key to store in the hash table entry. */ |
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134 | { |
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135 | Tcl_HashEntry *hPtr; |
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136 | |
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137 | hPtr = (Tcl_HashEntry *) TclpSysAlloc(sizeof(Tcl_HashEntry), 0); |
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138 | hPtr->key.oneWordValue = keyPtr; |
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139 | hPtr->clientData = NULL; |
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140 | |
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141 | return hPtr; |
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142 | } |
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143 | |
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144 | /* |
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145 | *---------------------------------------------------------------------- |
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146 | * |
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147 | * FreeThreadStorageEntry -- |
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148 | * |
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149 | * Frees space for a Tcl_HashEntry using TclpSysFree (not ckfree). We do |
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150 | * this because the threaded memory allocator MAY use the thread storage |
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151 | * hash tables. |
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152 | * |
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153 | * Results: |
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154 | * None. |
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155 | * |
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156 | * Side effects: |
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157 | * None. |
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158 | * |
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159 | *---------------------------------------------------------------------- |
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160 | */ |
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161 | |
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162 | static void |
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163 | FreeThreadStorageEntry( |
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164 | Tcl_HashEntry *hPtr) /* Hash entry to free. */ |
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165 | { |
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166 | TclpSysFree((char *) hPtr); |
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167 | } |
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168 | |
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169 | /* |
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170 | *---------------------------------------------------------------------- |
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171 | * |
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172 | * ThreadStorageGetHashTable -- |
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173 | * |
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174 | * This procedure returns a hash table pointer to be used for thread |
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175 | * storage for the specified thread. This assumes that thread storage |
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176 | * lock is held. |
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177 | * |
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178 | * Results: |
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179 | * A hash table pointer for the specified thread, or NULL if the hash |
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180 | * table has not been created yet. |
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181 | * |
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182 | * Side effects: |
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183 | * May change an entry in the master thread storage cache to point to the |
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184 | * specified thread and it's associated hash table. |
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185 | * |
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186 | *---------------------------------------------------------------------- |
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187 | */ |
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188 | |
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189 | static Tcl_HashTable * |
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190 | ThreadStorageGetHashTable( |
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191 | Tcl_ThreadId id) /* Id of thread to get hash table for */ |
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192 | { |
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193 | int index = PTR2UINT(id) % STORAGE_CACHE_SLOTS; |
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194 | Tcl_HashEntry *hPtr; |
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195 | int isNew; |
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196 | |
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197 | /* |
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198 | * It's important that we pick up the hash table pointer BEFORE comparing |
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199 | * thread Id in case another thread is in the critical region changing |
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200 | * things out from under you. |
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201 | */ |
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202 | |
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203 | Tcl_HashTable *hashTablePtr = threadStorageCache[index].hashTablePtr; |
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204 | |
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205 | if (threadStorageCache[index].id != id) { |
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206 | Tcl_MutexLock(&threadStorageLock); |
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207 | |
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208 | /* |
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209 | * It's not in the cache, so we look it up... |
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210 | */ |
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211 | |
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212 | hPtr = Tcl_FindHashEntry(&threadStorageHashTable, (char *) id); |
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213 | |
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214 | if (hPtr != NULL) { |
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215 | /* |
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216 | * We found it, extract the hash table pointer. |
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217 | */ |
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218 | |
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219 | hashTablePtr = Tcl_GetHashValue(hPtr); |
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220 | } else { |
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221 | /* |
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222 | * The thread specific hash table is not found. |
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223 | */ |
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224 | |
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225 | hashTablePtr = NULL; |
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226 | } |
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227 | |
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228 | if (hashTablePtr == NULL) { |
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229 | hashTablePtr = (Tcl_HashTable *) |
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230 | TclpSysAlloc(sizeof(Tcl_HashTable), 0); |
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231 | |
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232 | if (hashTablePtr == NULL) { |
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233 | Tcl_Panic("could not allocate thread specific hash table, " |
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234 | "TclpSysAlloc failed from ThreadStorageGetHashTable!"); |
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235 | } |
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236 | Tcl_InitCustomHashTable(hashTablePtr, TCL_CUSTOM_TYPE_KEYS, |
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237 | &tclThreadStorageHashKeyType); |
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238 | |
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239 | /* |
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240 | * Add new thread storage hash table to the master hash table. |
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241 | */ |
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242 | |
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243 | hPtr = Tcl_CreateHashEntry(&threadStorageHashTable, (char *) id, |
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244 | &isNew); |
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245 | |
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246 | if (hPtr == NULL) { |
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247 | Tcl_Panic("Tcl_CreateHashEntry failed from " |
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248 | "ThreadStorageGetHashTable!"); |
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249 | } |
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250 | Tcl_SetHashValue(hPtr, hashTablePtr); |
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251 | } |
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252 | |
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253 | /* |
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254 | * Now, we put it in the cache since it is highly likely it will be |
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255 | * needed again shortly. |
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256 | */ |
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257 | |
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258 | threadStorageCache[index].id = id; |
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259 | threadStorageCache[index].hashTablePtr = hashTablePtr; |
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260 | |
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261 | Tcl_MutexUnlock(&threadStorageLock); |
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262 | } |
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263 | |
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264 | return hashTablePtr; |
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265 | } |
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266 | |
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267 | /* |
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268 | *---------------------------------------------------------------------- |
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269 | * |
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270 | * TclInitThreadStorage -- |
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271 | * |
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272 | * Initializes the thread storage allocator. |
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273 | * |
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274 | * Results: |
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275 | * None. |
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276 | * |
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277 | * Side effects: |
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278 | * This procedure initializes the master hash table that maps thread ID |
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279 | * onto the individual index tables that map thread data key to thread |
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280 | * data. It also creates a cache that enables fast lookup of the thread |
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281 | * data block array for a recently executing thread without using |
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282 | * spinlocks. |
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283 | * |
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284 | * This procedure is called from an extremely early point in Tcl's |
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285 | * initialization. In particular, it may not use ckalloc/ckfree because they |
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286 | * may depend on thread-local storage (it uses TclpSysAlloc and TclpSysFree |
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287 | * instead). It may not depend on synchronization primitives - but no threads |
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288 | * other than the master thread have yet been launched. |
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289 | * |
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290 | *---------------------------------------------------------------------- |
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291 | */ |
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292 | |
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293 | void |
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294 | TclInitThreadStorage(void) |
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295 | { |
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296 | Tcl_InitCustomHashTable(&threadStorageHashTable, TCL_CUSTOM_TYPE_KEYS, |
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297 | &tclThreadStorageHashKeyType); |
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298 | |
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299 | /* |
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300 | * We also initialize the cache. |
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301 | */ |
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302 | |
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303 | memset((void*) &threadStorageCache, 0, |
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304 | sizeof(ThreadStorage) * STORAGE_CACHE_SLOTS); |
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305 | |
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306 | /* |
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307 | * Now, we set the first value to be used for a thread data key. |
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308 | */ |
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309 | |
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310 | nextThreadStorageKey = STORAGE_FIRST_KEY; |
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311 | } |
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312 | |
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313 | /* |
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314 | *---------------------------------------------------------------------- |
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315 | * |
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316 | * TclpThreadDataKeyGet -- |
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317 | * |
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318 | * This procedure returns a pointer to a block of thread local storage. |
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319 | * |
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320 | * Results: |
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321 | * A thread-specific pointer to the data structure, or NULL if the memory |
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322 | * has not been assigned to this key for this thread. |
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323 | * |
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324 | * Side effects: |
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325 | * None. |
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326 | * |
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327 | *---------------------------------------------------------------------- |
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328 | */ |
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329 | |
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330 | void * |
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331 | TclpThreadDataKeyGet( |
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332 | Tcl_ThreadDataKey *keyPtr) /* Identifier for the data chunk, really |
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333 | * (int**) */ |
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334 | { |
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335 | Tcl_HashTable *hashTablePtr = |
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336 | ThreadStorageGetHashTable(Tcl_GetCurrentThread()); |
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337 | Tcl_HashEntry *hPtr = Tcl_FindHashEntry(hashTablePtr, (char *) keyPtr); |
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338 | |
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339 | if (hPtr == NULL) { |
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340 | return NULL; |
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341 | } |
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342 | return Tcl_GetHashValue(hPtr); |
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343 | } |
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344 | |
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345 | /* |
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346 | *---------------------------------------------------------------------- |
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347 | * |
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348 | * TclpThreadDataKeySet -- |
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349 | * |
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350 | * This procedure sets the pointer to a block of thread local storage. |
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351 | * |
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352 | * Results: |
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353 | * None. |
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354 | * |
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355 | * Side effects: |
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356 | * Sets up the thread so future calls to TclpThreadDataKeyGet with this |
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357 | * key will return the data pointer. |
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358 | * |
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359 | *---------------------------------------------------------------------- |
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360 | */ |
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361 | |
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362 | void |
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363 | TclpThreadDataKeySet( |
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364 | Tcl_ThreadDataKey *keyPtr, /* Identifier for the data chunk, really |
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365 | * (pthread_key_t **) */ |
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366 | void *data) /* Thread local storage */ |
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367 | { |
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368 | Tcl_HashTable *hashTablePtr; |
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369 | Tcl_HashEntry *hPtr; |
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370 | int dummy; |
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371 | |
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372 | hashTablePtr = ThreadStorageGetHashTable(Tcl_GetCurrentThread()); |
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373 | hPtr = Tcl_CreateHashEntry(hashTablePtr, (char *)keyPtr, &dummy); |
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374 | |
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375 | Tcl_SetHashValue(hPtr, data); |
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376 | } |
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377 | |
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378 | /* |
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379 | *---------------------------------------------------------------------- |
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380 | * |
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381 | * TclpFinalizeThreadDataThread -- |
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382 | * |
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383 | * This procedure cleans up the thread storage hash table for the |
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384 | * current thread. |
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385 | * |
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386 | * Results: |
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387 | * None. |
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388 | * |
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389 | * Side effects: |
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390 | * Frees all associated thread storage, all hash table entries for |
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391 | * the thread's thread storage, and the hash table itself. |
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392 | * |
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393 | *---------------------------------------------------------------------- |
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394 | */ |
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395 | |
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396 | void |
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397 | TclpFinalizeThreadDataThread(void) |
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398 | { |
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399 | Tcl_ThreadId id = Tcl_GetCurrentThread(); |
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400 | /* Id of the thread to finalize. */ |
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401 | int index = PTR2UINT(id) % STORAGE_CACHE_SLOTS; |
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402 | Tcl_HashEntry *hPtr; /* Hash entry for current thread in master |
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403 | * table. */ |
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404 | Tcl_HashTable* hashTablePtr;/* Pointer to the hash table holding TSD |
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405 | * blocks for the current thread*/ |
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406 | Tcl_HashSearch search; /* Search object to walk the TSD blocks in the |
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407 | * designated thread */ |
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408 | Tcl_HashEntry *hPtr2; /* Hash entry for a TSD block in the |
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409 | * designated thread. */ |
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410 | |
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411 | Tcl_MutexLock(&threadStorageLock); |
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412 | hPtr = Tcl_FindHashEntry(&threadStorageHashTable, (char*)id); |
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413 | if (hPtr == NULL) { |
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414 | hashTablePtr = NULL; |
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415 | } else { |
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416 | /* |
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417 | * We found it, extract the hash table pointer. |
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418 | */ |
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419 | |
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420 | hashTablePtr = Tcl_GetHashValue(hPtr); |
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421 | Tcl_DeleteHashEntry(hPtr); |
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422 | |
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423 | /* |
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424 | * Make sure cache entry for this thread is NULL. |
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425 | */ |
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426 | |
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427 | if (threadStorageCache[index].id == id) { |
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428 | /* |
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429 | * We do not step on another thread's cache entry. This is |
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430 | * especially important if we are creating and exiting a lot of |
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431 | * threads. |
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432 | */ |
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433 | |
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434 | threadStorageCache[index].id = STORAGE_INVALID_THREAD; |
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435 | threadStorageCache[index].hashTablePtr = NULL; |
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436 | } |
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437 | } |
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438 | Tcl_MutexUnlock(&threadStorageLock); |
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439 | |
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440 | /* |
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441 | * The thread's hash table has been extracted and removed from the master |
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442 | * hash table. Now clean up the thread. |
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443 | */ |
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444 | |
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445 | if (hashTablePtr != NULL) { |
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446 | /* |
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447 | * Free all TSD |
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448 | */ |
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449 | |
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450 | for (hPtr2 = Tcl_FirstHashEntry(hashTablePtr, &search); hPtr2 != NULL; |
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451 | hPtr2 = Tcl_NextHashEntry(&search)) { |
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452 | void *blockPtr = Tcl_GetHashValue(hPtr2); |
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453 | |
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454 | if (blockPtr != NULL) { |
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455 | /* |
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456 | * The block itself was allocated in Tcl_GetThreadData using |
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457 | * ckalloc; use ckfree to dispose of it. |
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458 | */ |
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459 | |
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460 | ckfree(blockPtr); |
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461 | } |
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462 | } |
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463 | |
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464 | /* |
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465 | * Delete thread specific hash table and free the struct. |
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466 | */ |
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467 | |
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468 | Tcl_DeleteHashTable(hashTablePtr); |
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469 | TclpSysFree((char *) hashTablePtr); |
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470 | } |
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471 | } |
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472 | |
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473 | /* |
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474 | *---------------------------------------------------------------------- |
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475 | * |
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476 | * TclFinalizeThreadStorage -- |
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477 | * |
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478 | * This procedure cleans up the master thread storage hash table, all |
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479 | * thread specific hash tables, and the thread storage cache. |
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480 | * |
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481 | * Results: |
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482 | * None. |
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483 | * |
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484 | * Side effects: |
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485 | * The master thread storage hash table and thread storage cache are |
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486 | * reset to their initial (empty) state. |
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487 | * |
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488 | *---------------------------------------------------------------------- |
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489 | */ |
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490 | |
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491 | void |
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492 | TclFinalizeThreadStorage(void) |
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493 | { |
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494 | Tcl_HashSearch search; /* We need to hit every thread with this |
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495 | * search. */ |
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496 | Tcl_HashEntry *hPtr; /* Hash entry for current thread in master |
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497 | * table. */ |
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498 | Tcl_MutexLock(&threadStorageLock); |
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499 | |
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500 | /* |
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501 | * We are going to delete the hash table for every thread now. This hash |
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502 | * table should be empty at this point, except for one entry for the |
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503 | * current thread. |
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504 | */ |
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505 | |
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506 | for (hPtr = Tcl_FirstHashEntry(&threadStorageHashTable, &search); |
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507 | hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) { |
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508 | Tcl_HashTable *hashTablePtr = Tcl_GetHashValue(hPtr); |
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509 | |
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510 | if (hashTablePtr != NULL) { |
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511 | /* |
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512 | * Delete thread specific hash table for the thread in question |
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513 | * and free the struct. |
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514 | */ |
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515 | |
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516 | Tcl_DeleteHashTable(hashTablePtr); |
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517 | TclpSysFree((char *)hashTablePtr); |
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518 | } |
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519 | |
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520 | /* |
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521 | * Delete thread specific entry from master hash table. |
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522 | */ |
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523 | |
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524 | Tcl_SetHashValue(hPtr, NULL); |
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525 | } |
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526 | |
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527 | Tcl_DeleteHashTable(&threadStorageHashTable); |
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528 | |
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529 | /* |
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530 | * Clear out the thread storage cache as well. |
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531 | */ |
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532 | |
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533 | memset((void*) &threadStorageCache, 0, |
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534 | sizeof(ThreadStorage) * STORAGE_CACHE_SLOTS); |
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535 | |
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536 | /* |
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537 | * Reset this to zero, it will be set to STORAGE_FIRST_KEY if the thread |
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538 | * storage subsystem gets reinitialized |
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539 | */ |
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540 | |
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541 | nextThreadStorageKey = STORAGE_INVALID_KEY; |
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542 | |
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543 | Tcl_MutexUnlock(&threadStorageLock); |
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544 | } |
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545 | |
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546 | #else /* !defined(TCL_THREADS) */ |
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547 | |
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548 | /* |
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549 | * Stub functions for non-threaded builds |
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550 | */ |
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551 | |
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552 | void |
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553 | TclInitThreadStorage(void) |
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554 | { |
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555 | } |
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556 | |
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557 | void |
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558 | TclpFinalizeThreadDataThread(void) |
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559 | { |
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560 | } |
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561 | |
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562 | void |
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563 | TclFinalizeThreadStorage(void) |
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564 | { |
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565 | } |
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566 | |
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567 | #endif /* defined(TCL_THREADS) && defined(USE_THREAD_STORAGE) */ |
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568 | |
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569 | /* |
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570 | * Local Variables: |
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571 | * mode: c |
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572 | * c-basic-offset: 4 |
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573 | * fill-column: 78 |
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574 | * End: |
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575 | */ |
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