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annotate packages/services/memalloc/common/current/include/mvarimpl.hxx @ 208:e0c0827131d1 ecos
Merge from eCos master repository on 2002-05-20-20:11:54-BST
| author | jlarmour |
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| date | Mon, 20 May 2002 22:19:26 +0000 |
| parents | 6ed91473a1cd |
| children | d2c90368aeef |
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1 #ifndef CYGONCE_MEMALLOC_MVARIMPL_HXX |
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2 #define CYGONCE_MEMALLOC_MVARIMPL_HXX |
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3 |
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4 //========================================================================== |
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5 // |
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6 // mvarimpl.hxx |
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7 // |
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8 // Memory pool with variable block class declarations |
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9 // |
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10 //========================================================================== |
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11 //####ECOSGPLCOPYRIGHTBEGIN#### |
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12 // ------------------------------------------- |
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13 // This file is part of eCos, the Embedded Configurable Operating System. |
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. |
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15 // |
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16 // eCos is free software; you can redistribute it and/or modify it under |
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17 // the terms of the GNU General Public License as published by the Free |
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18 // Software Foundation; either version 2 or (at your option) any later version. |
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19 // |
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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23 // for more details. |
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24 // |
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25 // You should have received a copy of the GNU General Public License along |
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26 // with eCos; if not, write to the Free Software Foundation, Inc., |
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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28 // |
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29 // As a special exception, if other files instantiate templates or use macros |
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30 // or inline functions from this file, or you compile this file and link it |
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31 // with other works to produce a work based on this file, this file does not |
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32 // by itself cause the resulting work to be covered by the GNU General Public |
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33 // License. However the source code for this file must still be made available |
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34 // in accordance with section (3) of the GNU General Public License. |
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35 // |
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36 // This exception does not invalidate any other reasons why a work based on |
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37 // this file might be covered by the GNU General Public License. |
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38 // |
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
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40 // at http://sources.redhat.com/ecos/ecos-license |
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41 // ------------------------------------------- |
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42 //####ECOSGPLCOPYRIGHTEND#### |
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43 //========================================================================== |
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44 //#####DESCRIPTIONBEGIN#### |
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45 // |
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46 // Author(s): dsm, jlarmour |
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47 // Contributors: |
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48 // Date: 2000-06-12 |
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49 // Purpose: Define Mvarimpl class interface |
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50 // Description: Inline class for constructing a variable block allocator |
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51 // Usage: #include <cyg/memalloc/mvarimpl.hxx> |
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52 // |
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53 // |
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54 //####DESCRIPTIONEND#### |
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55 // |
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56 //========================================================================== |
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57 |
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58 |
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59 #include <cyg/infra/cyg_type.h> |
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60 #include <pkgconf/memalloc.h> |
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61 #include <cyg/memalloc/common.hxx> // Common memory allocator infra |
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62 |
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63 class Cyg_Mempool_Variable_Implementation { |
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64 protected: |
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65 // these constructors are explicitly disallowed |
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66 Cyg_Mempool_Variable_Implementation() {}; |
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67 // Cyg_Mempool_Variable_Implementation( Cyg_Mempool_Variable_Implementation &ref ) |
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68 // {}; |
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69 Cyg_Mempool_Variable_Implementation & |
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70 operator=( Cyg_Mempool_Variable_Implementation &ref ) |
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71 { return ref; }; |
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72 |
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73 struct memdq { |
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74 struct memdq *prev, *next; |
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75 cyg_int32 size; |
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76 }; |
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77 |
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78 struct memdq head; |
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79 cyg_uint8 *obase; |
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80 cyg_int32 osize; |
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81 cyg_uint8 *bottom; |
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82 cyg_uint8 *top; |
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83 cyg_int32 alignment; |
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84 cyg_int32 freemem; |
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85 |
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86 // round up size passed to alloc/free to a size that will be used |
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87 // for allocation |
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88 cyg_int32 |
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89 roundup(cyg_int32 size); |
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90 |
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91 struct memdq * |
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92 addr2memdq( cyg_uint8 *addr ); |
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93 |
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94 struct memdq * |
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95 alloc2memdq( cyg_uint8 *addr ); |
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96 |
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97 cyg_uint8 * |
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98 memdq2alloc( struct memdq *dq ); |
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99 |
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100 void |
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101 insert_free_block( struct memdq *freedq ); |
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102 |
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103 public: |
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104 // THIS is the public API of memory pools generally that can have the |
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105 // kernel oriented thread-safe package layer atop. |
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106 |
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107 // Constructor: gives the base and size of the arena in which memory is |
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108 // to be carved out. |
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109 Cyg_Mempool_Variable_Implementation( |
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110 cyg_uint8 * /* base */, |
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111 cyg_int32 /* size */, |
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112 CYG_ADDRWORD /* alignment */ = 8 ); |
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113 |
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114 // Destructor |
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115 ~Cyg_Mempool_Variable_Implementation(); |
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116 |
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117 // get size bytes of memory |
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118 cyg_uint8 * |
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119 try_alloc( cyg_int32 /* size */ ); |
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120 |
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121 // resize existing allocation, if oldsize is non-NULL, previous |
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122 // allocation size is placed into it. If previous size not available, |
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123 // it is set to 0. NB previous allocation size may have been rounded up. |
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124 // Occasionally the allocation can be adjusted *backwards* as well as, |
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125 // or instead of forwards, therefore the address of the resized |
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126 // allocation is returned, or NULL if no resizing was possible. |
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127 // Note that this differs from ::realloc() in that no attempt is |
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128 // made to call malloc() if resizing is not possible - that is left |
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129 // to higher layers. The data is copied from old to new though. |
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130 // The effects of alloc_ptr==NULL or newsize==0 are undefined |
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131 cyg_uint8 * |
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132 resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize, |
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133 cyg_int32 *oldsize ); |
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134 |
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135 // free size bytes of memory back to the pool |
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136 // returns true on success |
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137 cyg_bool |
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138 free( cyg_uint8 * /* ptr */, |
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139 cyg_int32 /* size */ ); |
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140 |
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141 // Get memory pool status |
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142 // flags is a bitmask of requested fields to fill in. The flags are |
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143 // defined in common.hxx |
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144 void |
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145 get_status( cyg_mempool_status_flag_t /* flags */, |
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146 Cyg_Mempool_Status & /* status */ ); |
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147 |
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148 }; |
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149 |
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150 #include <cyg/memalloc/mvarimpl.inl> |
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151 |
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152 // ------------------------------------------------------------------------- |
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153 #endif // ifndef CYGONCE_MEMALLOC_MVARIMPL_HXX |
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154 // EOF mvarimpl.hxx |
