1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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2 | /* $Id: mmblock.c,v 1.1 1997-04-15 09:24:26 schmidt 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 | Revision 1.0 1996/05/17 10:59:48 stobbe |
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7 | Initial revision |
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8 | |
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9 | */ |
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10 | |
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11 | #define _POSIX_SOURCE 1 |
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12 | |
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13 | #include <config.h> |
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14 | |
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15 | #include <stdio.h> |
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16 | #include <stdlib.h> |
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17 | |
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18 | #include "memman.h" |
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19 | #include "mmprivate.h" |
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20 | |
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21 | typedef struct memBlock |
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22 | { |
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23 | struct memBlock *next; |
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24 | char data[MAXDATA]; |
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25 | } memBlock; |
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26 | |
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27 | |
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28 | static memBlock * mm_theBlocks = NULL; |
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29 | static memBlock * mm_tmpBlocks = NULL; |
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30 | static memBlock * mm_normBlocks = NULL; |
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31 | |
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32 | static status_t mm_blockStatus = MM_NORMAL; |
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33 | |
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34 | void |
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35 | mmInitBlocks( void ) |
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36 | { |
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37 | mm_theBlocks = mm_tmpBlocks = mm_normBlocks = NULL; |
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38 | mm_blockStatus = MM_NORMAL; |
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39 | } |
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40 | |
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41 | void |
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42 | mmMarkBlocks( void ) |
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43 | { |
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44 | mm_blockStatus = MM_TMP; |
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45 | mm_normBlocks = mm_theBlocks; |
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46 | mm_theBlocks = NULL; |
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47 | } |
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48 | |
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49 | void |
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50 | mmSweepBlocks( void ) |
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51 | { |
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52 | memBlock * dummy; |
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53 | |
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54 | while ( mm_tmpBlocks != NULL ) { |
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55 | dummy = mm_tmpBlocks; |
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56 | mm_tmpBlocks = mm_tmpBlocks->next; |
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57 | free( dummy ); |
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58 | mm_bytesReal -= sizeof( memBlock ); |
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59 | } |
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60 | mmNewPrintMark(); |
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61 | mm_tmpBlocks = NULL; |
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62 | mm_theBlocks = mm_normBlocks; |
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63 | mm_blockStatus = MM_NORMAL; |
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64 | } |
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65 | |
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66 | void |
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67 | mmSwitchBlocks( void ) |
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68 | { |
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69 | if ( mm_blockStatus == MM_TMP ) { |
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70 | mm_blockStatus = MM_SWITCHED; |
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71 | mm_tmpBlocks = mm_theBlocks; |
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72 | mm_theBlocks = mm_normBlocks; |
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73 | } |
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74 | else { |
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75 | mm_blockStatus = MM_TMP; |
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76 | mm_normBlocks = mm_theBlocks; |
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77 | mm_theBlocks = mm_tmpBlocks; |
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78 | } |
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79 | } |
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80 | |
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81 | void * |
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82 | mmGetBlock( void ) |
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83 | { |
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84 | memBlock * dummy = (memBlock*)malloc( sizeof( memBlock ) ); |
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85 | |
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86 | if ( dummy == NULL ) { |
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87 | (void)fprintf( stderr, "\nerror: no more memory\n" ); |
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88 | exit(14); |
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89 | } |
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90 | dummy->next = mm_theBlocks; |
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91 | mm_theBlocks = dummy; |
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92 | mm_bytesReal += sizeof( memBlock ); |
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93 | return &dummy->data[0]; |
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94 | } |
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