fieker-DuValspielwiese
Last change
on this file since 2dd068 was
2dd068,
checked in by Rüdiger Stobbe <stobbe@…>, 28 years ago
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Initial revision
git-svn-id: file:///usr/local/Singular/svn/trunk@6 2c84dea3-7e68-4137-9b89-c4e89433aadc
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-
Property mode set to
100644
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File size:
1.6 KB
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Rev | Line | |
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[2dd068] | 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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| 2 | /* $Id: mmblock.c,v 1.0 1996-05-17 10:59:48 stobbe Exp $ */ |
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| 3 | |
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| 4 | /* |
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| 5 | $Log: not supported by cvs2svn $ |
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| 6 | */ |
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| 7 | |
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| 8 | #define _POSIX_SOURCE 1 |
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| 9 | |
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| 10 | #include <stdio.h> |
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| 11 | #include <stdlib.h> |
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| 12 | #include "memman.h" |
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| 13 | #include "mmprivate.h" |
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| 14 | |
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| 15 | typedef struct memBlock |
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| 16 | { |
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| 17 | struct memBlock *next; |
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| 18 | char data[MAXDATA]; |
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| 19 | } memBlock; |
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| 20 | |
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| 21 | |
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| 22 | static memBlock * mm_theBlocks = NULL; |
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| 23 | static memBlock * mm_tmpBlocks = NULL; |
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| 24 | static memBlock * mm_normBlocks = NULL; |
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| 25 | |
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| 26 | static status_t mm_blockStatus = MM_NORMAL; |
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| 27 | |
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| 28 | void |
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| 29 | mmInitBlocks( void ) |
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| 30 | { |
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| 31 | mm_theBlocks = mm_tmpBlocks = mm_normBlocks = NULL; |
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| 32 | mm_blockStatus = MM_NORMAL; |
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| 33 | } |
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| 34 | |
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| 35 | void |
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| 36 | mmMarkBlocks( void ) |
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| 37 | { |
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| 38 | mm_blockStatus = MM_TMP; |
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| 39 | mm_normBlocks = mm_theBlocks; |
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| 40 | mm_theBlocks = NULL; |
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| 41 | } |
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| 42 | |
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| 43 | void |
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| 44 | mmSweepBlocks( void ) |
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| 45 | { |
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| 46 | memBlock * dummy; |
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| 47 | |
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| 48 | while ( mm_tmpBlocks != NULL ) { |
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| 49 | dummy = mm_tmpBlocks; |
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| 50 | mm_tmpBlocks = mm_tmpBlocks->next; |
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| 51 | free( dummy ); |
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| 52 | mm_bytesReal -= sizeof( memBlock ); |
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| 53 | } |
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| 54 | mmNewPrintMark(); |
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| 55 | mm_tmpBlocks = NULL; |
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| 56 | mm_theBlocks = mm_normBlocks; |
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| 57 | mm_blockStatus = MM_NORMAL; |
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| 58 | } |
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| 59 | |
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| 60 | void |
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| 61 | mmSwitchBlocks( void ) |
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| 62 | { |
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| 63 | if ( mm_blockStatus == MM_TMP ) { |
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| 64 | mm_blockStatus = MM_SWITCHED; |
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| 65 | mm_tmpBlocks = mm_theBlocks; |
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| 66 | mm_theBlocks = mm_normBlocks; |
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| 67 | } |
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| 68 | else { |
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| 69 | mm_blockStatus = MM_TMP; |
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| 70 | mm_normBlocks = mm_theBlocks; |
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| 71 | mm_theBlocks = mm_tmpBlocks; |
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| 72 | } |
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| 73 | } |
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| 74 | |
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| 75 | void * |
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| 76 | mmGetBlock( void ) |
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| 77 | { |
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| 78 | memBlock * dummy = (memBlock*)malloc( sizeof( memBlock ) ); |
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| 79 | |
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| 80 | if ( dummy == NULL ) { |
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| 81 | (void)fprintf( stderr, "\nerror: no more memory\n" ); |
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| 82 | exit(14); |
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| 83 | } |
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| 84 | dummy->next = mm_theBlocks; |
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| 85 | mm_theBlocks = dummy; |
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| 86 | mm_bytesReal += sizeof( memBlock ); |
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| 87 | return &dummy->data[0]; |
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| 88 | } |
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| 89 | |
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