1 | /* emacs edit mode for this file is -*- C -*- */ |
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2 | /* $Id$ */ |
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3 | |
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4 | #define _POSIX_SOURCE 1 |
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5 | |
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6 | #include <config.h> |
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7 | |
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8 | #include <stdlib.h> |
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9 | |
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10 | #include "memman.h" |
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11 | #include "mmprivate.h" |
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12 | |
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13 | static char * mm_theHeapPtr = NULL; |
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14 | static char * mm_tmpHeapPtr = NULL; |
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15 | static char * mm_normHeapPtr = NULL; |
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16 | |
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17 | static int mm_theBytesLeft = 0; |
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18 | static int mm_tmpBytesLeft = 0; |
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19 | static int mm_normBytesLeft = 0; |
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20 | |
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21 | static status_t mm_heapStatus = MM_NORMAL; |
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22 | |
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23 | static void mmDistributeRestOfHeap( void ); |
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24 | |
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25 | void |
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26 | mmInitHeap( void ) |
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27 | { |
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28 | mm_theHeapPtr = mm_tmpHeapPtr = mm_normHeapPtr = NULL; |
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29 | mm_theBytesLeft = mm_tmpBytesLeft = mm_normBytesLeft = 0; |
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30 | mm_heapStatus = MM_NORMAL; |
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31 | } |
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32 | |
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33 | void |
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34 | mmMarkHeap( void ) |
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35 | { |
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36 | mm_normHeapPtr = mm_theHeapPtr; mm_normBytesLeft = mm_theBytesLeft; |
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37 | mm_theHeapPtr = NULL; mm_theBytesLeft = 0; |
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38 | mm_heapStatus = MM_TMP; |
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39 | } |
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40 | |
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41 | void |
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42 | mmSweepHeap( void ) |
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43 | { |
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44 | mm_theHeapPtr = mm_normHeapPtr; mm_theBytesLeft = mm_normBytesLeft; |
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45 | mm_heapStatus = MM_NORMAL; |
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46 | } |
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47 | |
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48 | void |
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49 | mmSwitchHeap( void ) |
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50 | { |
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51 | if ( mm_heapStatus == MM_TMP ) { |
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52 | mm_heapStatus = MM_SWITCHED; |
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53 | mm_tmpHeapPtr = mm_theHeapPtr; mm_tmpBytesLeft = mm_theBytesLeft; |
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54 | mm_theHeapPtr = mm_normHeapPtr; mm_theBytesLeft = mm_normBytesLeft; |
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55 | } |
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56 | else { |
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57 | mm_heapStatus = MM_TMP; |
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58 | mm_normHeapPtr = mm_theHeapPtr; mm_normBytesLeft = mm_theBytesLeft; |
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59 | mm_theHeapPtr = mm_tmpHeapPtr; mm_theBytesLeft = mm_tmpBytesLeft; |
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60 | } |
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61 | } |
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62 | |
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63 | void * |
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64 | mmGetMemory( size_t size ) |
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65 | { |
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66 | void * dummy; |
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67 | |
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68 | if ( mm_theBytesLeft < size ) { |
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69 | mmDistributeRestOfHeap(); |
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70 | mm_theHeapPtr = (char*)mmGetBlock(); |
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71 | mm_theBytesLeft = MAXDATA; |
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72 | } |
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73 | dummy = (void*)mm_theHeapPtr; |
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74 | mm_theBytesLeft -= size; |
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75 | mm_theHeapPtr += size; |
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76 | return dummy; |
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77 | } |
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78 | |
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79 | int |
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80 | mmPutMemory( void *adr, size_t size ) |
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81 | { |
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82 | void * dummy=(void *)((char *)adr+size); |
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83 | |
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84 | if ( dummy == mm_theHeapPtr) { |
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85 | mm_theHeapPtr=(char *)adr; |
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86 | mm_theBytesLeft += size; |
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87 | return 1; /*TRUE*/ |
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88 | } |
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89 | return 0; /*FALSE*/ |
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90 | } |
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91 | |
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92 | #ifndef MDEBUG |
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93 | |
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94 | void |
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95 | mmDistributeRestOfHeap( void ) |
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96 | { |
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97 | /* |
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98 | char* dummy; |
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99 | int j; |
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100 | |
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101 | while ( mm_theBytesLeft > RealSizeFromSize( mmGetSize( 0 ) ) ) { |
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102 | j = mmGetIndex( SizeFromRealSize( mm_theBytesLeft ) ); |
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103 | if ( RealSizeFromSize( mmGetSize( j ) ) > mm_theBytesLeft ) j--; |
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104 | dummy = mm_theHeapPtr; |
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105 | mm_theHeapPtr += RealSizeFromSize( mmGetSize( j ) ); |
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106 | mm_theBytesLeft -= RealSizeFromSize( mmGetSize( j ) ); |
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107 | mmFreeBlock( &(dummy[DebugOffsetFront]), mmGetSize( j ) ); |
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108 | } |
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109 | */ |
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110 | } |
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111 | |
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112 | #else /* MDEBUG */ |
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113 | |
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114 | void |
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115 | mmDistributeRestOfHeap( void ) |
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116 | { |
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117 | /* |
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118 | void* dummy; |
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119 | int j; |
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120 | |
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121 | while ( mm_theBytesLeft > RealSizeFromSize( mmGetSize( 0 ) ) ) { |
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122 | j = mmGetIndex( SizeFromRealSize( mm_theBytesLeft ) ); |
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123 | if ( RealSizeFromSize( mmGetSize( j ) ) > mm_theBytesLeft ) j--; |
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124 | dummy = mmAllocBlock( mmGetSize( j ) ); |
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125 | mmFreeBlock( &dummy, mmGetSize( j ) ); |
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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 | #endif /* MDEBUG */ |
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