[2dd068] | 1 | /* emacs edit mode for this file is -*- C -*- */ |
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[341696] | 2 | /* $Id$ */ |
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[2dd068] | 3 | |
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| 4 | #define _POSIX_SOURCE 1 |
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| 5 | |
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[9d7aaa] | 6 | #include <config.h> |
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| 7 | |
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[2dd068] | 8 | #include <stdlib.h> |
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[9d7aaa] | 9 | |
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[2dd068] | 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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