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