spielwiese
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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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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