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1 /*
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2 * Copyright 2009 OpenSourceCodeStewardshipFoundation.org
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3 * Licensed under GNU General Public License version 2
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4 *
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5 * Author: seanhalle@yahoo.com
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6 *
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7 * Created on November 14, 2009, 9:07 PM
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8 */
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9
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10 #include <malloc.h>
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11 #include <inttypes.h>
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12 #include <stdlib.h>
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13 #include <stdio.h>
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14
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15 #include "VMS.h"
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16 #include "Histogram/Histogram.h"
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17
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18 /*Helper function
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19 *Insert a newly generated free chunk into the first spot on the free list.
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20 * The chunk is cast as a MallocProlog, so the various pointers in it are
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21 * accessed with C's help -- and the size of the prolog is easily added to
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22 * the pointer when a chunk is returned to the app -- so C handles changes
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23 * in pointer sizes among machines.
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24 *
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25 *The list head is a normal MallocProlog struct -- identified by its
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26 * prevChunkInFreeList being NULL -- the only one.
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27 *
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28 *The end of the list is identified by next chunk being NULL, as usual.
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29 */
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30 void inline
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31 add_chunk_to_free_list( MallocProlog *chunk, MallocProlog *listHead )
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32 {
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33 chunk->nextChunkInFreeList = listHead->nextChunkInFreeList;
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34 if( chunk->nextChunkInFreeList != NULL ) //if not last in free list
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35 chunk->nextChunkInFreeList->prevChunkInFreeList = chunk;
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36 chunk->prevChunkInFreeList = listHead;
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37 listHead->nextChunkInFreeList = chunk;
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38 }
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39
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40
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41 /*This is sequential code, meant to only be called from the Master, not from
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42 * any slave VPs.
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43 *Search down list, checking size by the nextHigherInMem pointer, to find
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44 * first chunk bigger than size needed.
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45 *Shave off the extra and make it into a new free-list element, hook it in
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46 * then return the address of the found element plus size of prolog.
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47 *
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48 *Will find a
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49 */
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50 void *VMS__malloc( size_t sizeRequested )
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51 { MallocProlog *foundElem = NULL, *currElem, *newElem;
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52 ssize_t amountExtra, sizeConsumed,sizeOfFound;
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53 uint32 foundElemIsTopOfHeap;
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54
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55 //============================= MEASUREMENT STUFF ========================
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56 #ifdef MEAS__TIME_MALLOC
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57 int32 startStamp, endStamp;
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58 saveLowTimeStampCountInto( startStamp );
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59 #endif
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60 //========================================================================
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61
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62 //step up the size to be aligned at 16-byte boundary, prob better ways
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63 sizeRequested = ((sizeRequested + 16) >> 4) << 4;
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64 currElem = (_VMSMasterEnv->freeListHead)->nextChunkInFreeList;
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65
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66 while( currElem != NULL )
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67 { //check if size of currElem is big enough
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68 sizeOfFound=(size_t)((uintptr_t)currElem->nextHigherInMem -(uintptr_t)currElem);
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69 amountExtra = sizeOfFound - sizeRequested - sizeof(MallocProlog);
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70 if( amountExtra > 0 )
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71 { //found it, get out of loop
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72 foundElem = currElem;
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73 currElem = NULL;
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74 }
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75 else
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76 currElem = currElem->nextChunkInFreeList;
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77 }
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78
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79 if( foundElem == NULL )
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80 { ERROR("\nmalloc failed\n")
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81 return (void *)NULL; //indicates malloc failed
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82 }
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83 //Using a kludge to identify the element that is the top chunk in the
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84 // heap -- saving top-of-heap addr in head's nextHigherInMem -- and
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85 // save addr of start of heap in head's nextLowerInMem
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86 //Will handle top of Heap specially
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87 foundElemIsTopOfHeap = foundElem->nextHigherInMem ==
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88 _VMSMasterEnv->freeListHead->nextHigherInMem;
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89
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90 //before shave off and try to insert new elem, remove found elem
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91 //note, foundElem will never be the head, so always has valid prevChunk
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92 foundElem->prevChunkInFreeList->nextChunkInFreeList =
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93 foundElem->nextChunkInFreeList;
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94 if( foundElem->nextChunkInFreeList != NULL )
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95 { foundElem->nextChunkInFreeList->prevChunkInFreeList =
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96 foundElem->prevChunkInFreeList;
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97 }
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98 foundElem->prevChunkInFreeList = NULL;//indicates elem currently allocated
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99
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100 //if enough, turn extra into new elem & insert it
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101 if( amountExtra > 64 )
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102 { //make new elem by adding to addr of curr elem then casting
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103 sizeConsumed = sizeof(MallocProlog) + sizeRequested;
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104 newElem = (MallocProlog *)( (uintptr_t)foundElem + sizeConsumed );
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105 newElem->nextHigherInMem = foundElem->nextHigherInMem;
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106 newElem->nextLowerInMem = foundElem;
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107 foundElem->nextHigherInMem = newElem;
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108
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109 if( ! foundElemIsTopOfHeap )
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110 { //there is no next higher for top of heap, so can't write to it
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111 newElem->nextHigherInMem->nextLowerInMem = newElem;
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112 }
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113 add_chunk_to_free_list( newElem, _VMSMasterEnv->freeListHead );
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114 }
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115 else
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116 {
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117 sizeConsumed = sizeOfFound;
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118 }
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119 _VMSMasterEnv->amtOfOutstandingMem += sizeConsumed;
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120
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121 //============================= MEASUREMENT STUFF ========================
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122 #ifdef MEAS__TIME_MALLOC
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123 saveLowTimeStampCountInto( endStamp );
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124 addIntervalToHist( startStamp, endStamp, _VMSMasterEnv->mallocTimeHist );
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125 #endif
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126 //========================================================================
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127
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128 //skip over the prolog by adding its size to the pointer return
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129 return (void*)((uintptr_t)foundElem + sizeof(MallocProlog));
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130 }
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131
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132
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133 /*This is sequential code -- only to be called from the Master
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134 * When free, subtract the size of prolog from pointer, then cast it to a
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135 * MallocProlog. Then check the nextLower and nextHigher chunks to see if
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136 * one or both are also free, and coalesce if so, and if neither free, then
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137 * add this one to free-list.
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138 */
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139 void
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140 VMS__free( void *ptrToFree )
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141 { MallocProlog *elemToFree, *nextLowerElem, *nextHigherElem;
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142 size_t sizeOfElem;
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143 uint32 lowerExistsAndIsFree, higherExistsAndIsFree;
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144
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145 //============================= MEASUREMENT STUFF ========================
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146 #ifdef MEAS__TIME_MALLOC
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147 int32 startStamp, endStamp;
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148 saveLowTimeStampCountInto( startStamp );
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149 #endif
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150 //========================================================================
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151
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152 if( ptrToFree < (void*)_VMSMasterEnv->freeListHead->nextLowerInMem ||
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153 ptrToFree > (void*)_VMSMasterEnv->freeListHead->nextHigherInMem )
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154 { //outside the range of data owned by VMS's malloc, so do nothing
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155 return;
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156 }
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157 //subtract size of prolog to get pointer to prolog, then cast
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158 elemToFree = (MallocProlog *)((uintptr_t)ptrToFree - sizeof(MallocProlog));
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159 sizeOfElem =(size_t)((uintptr_t)elemToFree->nextHigherInMem-(uintptr_t)elemToFree);
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160
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161 if( elemToFree->prevChunkInFreeList != NULL )
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162 { printf( "error: freeing same element twice!" ); exit(1);
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163 }
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164
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165 _VMSMasterEnv->amtOfOutstandingMem -= sizeOfElem;
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166
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167 nextLowerElem = elemToFree->nextLowerInMem;
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168 nextHigherElem = elemToFree->nextHigherInMem;
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169
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170 if( nextHigherElem == NULL )
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171 higherExistsAndIsFree = FALSE;
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172 else //okay exists, now check if in the free-list by checking back ptr
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173 higherExistsAndIsFree = (nextHigherElem->prevChunkInFreeList != NULL);
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174
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175 if( nextLowerElem == NULL )
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176 lowerExistsAndIsFree = FALSE;
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177 else //okay, it exists, now check if it's free
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178 lowerExistsAndIsFree = (nextLowerElem->prevChunkInFreeList != NULL);
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179
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180
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181 //now, know what exists and what's free
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182 if( lowerExistsAndIsFree )
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183 { if( higherExistsAndIsFree )
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184 { //both exist and are free, so coalesce all three
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185 //First, remove higher from free-list
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186 nextHigherElem->prevChunkInFreeList->nextChunkInFreeList =
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187 nextHigherElem->nextChunkInFreeList;
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188 if( nextHigherElem->nextChunkInFreeList != NULL ) //end-of-list?
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189 nextHigherElem->nextChunkInFreeList->prevChunkInFreeList =
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190 nextHigherElem->prevChunkInFreeList;
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191 //Now, fix-up sequence-in-mem list -- by side-effect, this also
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192 // changes size of the lower elem, which is still in free-list
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193 nextLowerElem->nextHigherInMem = nextHigherElem->nextHigherInMem;
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194 if( nextHigherElem->nextHigherInMem !=
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195 _VMSMasterEnv->freeListHead->nextHigherInMem )
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196 nextHigherElem->nextHigherInMem->nextLowerInMem = nextLowerElem;
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197 //notice didn't do anything to elemToFree -- it simply is no
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198 // longer reachable from any of the lists. Wonder if could be a
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199 // security leak because left valid addresses in it,
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200 // but don't care for now.
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201 }
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202 else
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203 { //lower is the only of the two that exists and is free,
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204 //In this case, no adjustment to free-list, just change mem-list.
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205 // By side-effect, changes size of the lower elem
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206 nextLowerElem->nextHigherInMem = elemToFree->nextHigherInMem;
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207 if( elemToFree->nextHigherInMem !=
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208 _VMSMasterEnv->freeListHead->nextHigherInMem )
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209 elemToFree->nextHigherInMem->nextLowerInMem = nextLowerElem;
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210 }
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211 }
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212 else
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213 { //lower either doesn't exist or isn't free, so check higher
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214 if( higherExistsAndIsFree )
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215 { //higher exists and is the only of the two free
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216 //First, in free-list, replace higher elem with the one to free
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217 elemToFree->nextChunkInFreeList=nextHigherElem->nextChunkInFreeList;
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218 elemToFree->prevChunkInFreeList=nextHigherElem->prevChunkInFreeList;
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219 elemToFree->prevChunkInFreeList->nextChunkInFreeList = elemToFree;
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220 if( elemToFree->nextChunkInFreeList != NULL ) // end-of-list?
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221 elemToFree->nextChunkInFreeList->prevChunkInFreeList =elemToFree;
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222 //Now chg mem-list. By side-effect, changes size of elemToFree
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223 elemToFree->nextHigherInMem = nextHigherElem->nextHigherInMem;
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224 if( elemToFree->nextHigherInMem !=
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225 _VMSMasterEnv->freeListHead->nextHigherInMem )
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226 elemToFree->nextHigherInMem->nextLowerInMem = elemToFree;
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227 }
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228 else
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229 { //neither lower nor higher is availabe to coalesce so add to list
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230 // this makes prev chunk ptr non-null, which indicates it's free
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231 elemToFree->nextChunkInFreeList =
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232 _VMSMasterEnv->freeListHead->nextChunkInFreeList;
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233 _VMSMasterEnv->freeListHead->nextChunkInFreeList = elemToFree;
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234 if( elemToFree->nextChunkInFreeList != NULL ) // end-of-list?
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235 elemToFree->nextChunkInFreeList->prevChunkInFreeList =elemToFree;
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236 elemToFree->prevChunkInFreeList = _VMSMasterEnv->freeListHead;
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237 }
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238 }
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239 //============================= MEASUREMENT STUFF ========================
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240 #ifdef MEAS__TIME_MALLOC
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241 saveLowTimeStampCountInto( endStamp );
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242 addIntervalToHist( startStamp, endStamp, _VMSMasterEnv->freeTimeHist );
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243 #endif
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244 //========================================================================
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245
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246 }
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247
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248
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249 /*Allocates memory from the external system -- higher overhead
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250 *
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251 *Because of Linux's malloc throwing bizarre random faults when malloc is
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252 * used inside a VMS virtual processor, have to pass this as a request and
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253 * have the core loop do it when it gets around to it -- will look for these
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254 * chores leftover from the previous animation of masterVP the next time it
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255 * goes to animate the masterVP -- so it takes two separate masterVP
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256 * animations, separated by work, to complete an external malloc or
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257 * external free request.
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258 *
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259 *Thinking core loop accepts signals -- just looks if signal-location is
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260 * empty or not --
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261 */
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262 void *
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263 VMS__malloc_in_ext( size_t sizeRequested )
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264 {
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265 /*
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266 //This is running in the master, so no chance for multiple cores to be
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267 // competing for the core's flag.
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268 if( *(_VMSMasterEnv->coreLoopSignalAddr[ 0 ]) != 0 )
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269 { //something has already signalled to core loop, so save the signal
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270 // and look, next time master animated, to see if can send it.
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271 //Note, the addr to put a signal is in the coreloop's frame, so just
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272 // checks it each time through -- make it volatile to avoid GCC
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273 // optimizations -- it's a coreloop local var that only changes
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274 // after jumping away. The signal includes the addr to send the
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275 //return to -- even if just empty return completion-signal
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276 //
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277 //save the signal in some queue that the master looks at each time
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278 // it starts up -- one loc says if empty for fast common case --
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279 //something like that -- want to hide this inside this call -- but
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280 // think this has to come as a request -- req handler gives procr
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281 // back to master loop, which gives it back to req handler at point
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282 // it sees that core loop has sent return signal. Something like
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283 // that.
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284 saveTheSignal
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285
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286 }
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287 coreSigData->type = malloc;
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288 coreSigData->sizeToMalloc = sizeRequested;
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289 coreSigData->locToSignalCompletion = &figureOut;
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290 _VMSMasterEnv->coreLoopSignals[ 0 ] = coreSigData;
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291 */
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292 //just risk system-stack faults until get this figured out
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293 return malloc( sizeRequested );
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294 }
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295
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296
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297 /*Frees memory that was allocated in the external system -- higher overhead
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298 *
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299 *As noted in external malloc comment, this is clunky 'cause the free has
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Me@53
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300 * to be called in the core loop.
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Me@53
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301 */
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Me@53
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302 void
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Me@53
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303 VMS__free_in_ext( void *ptrToFree )
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Me@53
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304 {
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Me@53
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305 //just risk system-stack faults until get this figured out
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Me@53
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306 free( ptrToFree );
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Me@53
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307
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Me@53
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308 //TODO: fix this -- so
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Me@53
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309 }
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Me@53
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310
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Me@53
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311
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Me@50
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312 /*Designed to be called from the main thread outside of VMS, during init
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Me@50
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313 */
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Me@50
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314 MallocProlog *
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Me@53
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315 VMS_ext__create_free_list()
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Me@50
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316 { MallocProlog *freeListHead, *firstChunk;
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Me@50
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317
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Me@50
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318 //Note, this is running in the main thread -- all increases in malloc
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Me@50
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319 // mem and all frees of it must be done in this thread, with the
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Me@50
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320 // thread's original stack available
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Me@50
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321 freeListHead = malloc( sizeof(MallocProlog) );
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Me@50
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322 firstChunk = malloc( MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE );
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Me@50
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323 if( firstChunk == NULL ) {printf("malloc error\n"); exit(1);}
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Me@50
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324
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325 freeListHead->prevChunkInFreeList = NULL;
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Me@50
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326 //Use this addr to free the heap when cleanup
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Me@50
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327 freeListHead->nextLowerInMem = firstChunk;
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Me@50
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328 //to identify top-of-heap elem, compare this addr to elem's next higher
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msach@76
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329 freeListHead->nextHigherInMem = (void*)( (uintptr_t)firstChunk +
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Me@53
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330 MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE);
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Me@50
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331 freeListHead->nextChunkInFreeList = firstChunk;
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Me@50
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332
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Me@50
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333 firstChunk->nextChunkInFreeList = NULL;
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Me@50
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334 firstChunk->prevChunkInFreeList = freeListHead;
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Me@50
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335 //next Higher has to be set to top of chunk, so can calc size in malloc
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msach@76
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336 firstChunk->nextHigherInMem = (void*)( (uintptr_t)firstChunk +
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Me@53
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337 MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE);
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Me@50
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338 firstChunk->nextLowerInMem = NULL; //identifies as bott of heap
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Me@53
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339
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Me@53
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340 _VMSMasterEnv->amtOfOutstandingMem = 0; //none allocated yet
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Me@50
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341
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Me@50
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342 return freeListHead;
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Me@50
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343 }
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Me@50
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344
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Me@50
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345
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Me@50
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346 /*Designed to be called from the main thread outside of VMS, during cleanup
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Me@50
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347 */
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Me@50
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348 void
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Me@50
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349 VMS_ext__free_free_list( MallocProlog *freeListHead )
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Me@50
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350 {
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Me@50
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351 //stashed a ptr to the one and only bug chunk malloc'd from OS in the
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Me@50
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352 // free list head's next lower in mem pointer
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Me@50
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353 free( freeListHead->nextLowerInMem );
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Me@50
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354
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Me@50
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355 //don't free the head -- it'll be in an array eventually -- free whole
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Me@50
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356 // array when all the free lists linked from it have already been freed
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Me@50
|
357 }
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Me@50
|
358
|
