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annotate packages/services/memalloc/common/current/include/sepmetaimpl.hxx @ 176:3902ef905c9c

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Merge from eCos master repository on 2001-08-03-06:43:13-BST
author jlarmour
date Fri, 03 Aug 2001 12:27:32 +0000
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children e0c0827131d1
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1 #ifndef CYGONCE_MEMALLOC_SEPMETAIMPL_HXX
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2 #define CYGONCE_MEMALLOC_SEPMETAIMPL_HXX
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3
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4 //==========================================================================
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5 //
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6 // sepmetaimpl.hxx
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7 //
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8 // Variable block memory pool with separate metadata class declarations
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9 //
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10 //==========================================================================
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11 //####COPYRIGHTBEGIN####
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12 //
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13 // -------------------------------------------
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14 // The contents of this file are subject to the Red Hat eCos Public License
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15 // Version 1.1 (the "License"); you may not use this file except in
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16 // compliance with the License. You may obtain a copy of the License at
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17 // http://www.redhat.com/
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18 //
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19 // Software distributed under the License is distributed on an "AS IS"
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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21 // License for the specific language governing rights and limitations under
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22 // the License.
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23 //
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24 // The Original Code is eCos - Embedded Configurable Operating System,
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25 // released September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Red Hat.
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28 // Portions created by Red Hat are
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29 // Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
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30 // All Rights Reserved.
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31 // -------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //==========================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): jlarmour
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38 // Contributors:
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39 // Date: 2001-06-28
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40 // Purpose: Define Sepmetaimpl class interface
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41 // Description: Inline class for constructing a variable block allocator
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42 // with separate metadata.
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43 // Usage: #include <cyg/memalloc/sepmetaimpl.hxx>
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44 //
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45 //
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46 //####DESCRIPTIONEND####
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47 //
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48 //==========================================================================
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49
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50
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51 #include <cyg/infra/cyg_type.h>
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52 #include <pkgconf/memalloc.h>
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53 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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54
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55 class Cyg_Mempool_Sepmeta_Implementation {
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56 protected:
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57 // these constructors are explicitly disallowed
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58 Cyg_Mempool_Sepmeta_Implementation() {};
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59 // Cyg_Mempool_Sepmeta_Implementation( Cyg_Mempool_Sepmeta_Implementation &ref )
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60 // {};
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61 Cyg_Mempool_Sepmeta_Implementation &
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62 operator=( Cyg_Mempool_Sepmeta_Implementation &ref )
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63 { return ref; };
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64
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65 struct memdq {
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66 struct memdq *prev, *next; // prev/next alloced/free block
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67 struct memdq *memprev, *memnext; // prev/next block in memory
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68 cyg_uint8 *mem; // memory address associated with this block
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69 };
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70
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71 struct memdq allocedhead; // list of alloced memory
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72 struct memdq freehead; // list of free memory
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73 struct memdq memhead; // initial block on free list
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74 struct memdq memend; // dummy memdq indicating the end
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75 // of memory, as if it were alloced
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76 struct memdq *freemetahead; // unused memdq's
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77 cyg_uint8 *obase;
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78 cyg_int32 osize;
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79 cyg_uint8 *metabase;
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80 cyg_int32 metasize;
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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 addresses according to required alignment of pool
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87 cyg_uint8 *
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88 alignup( cyg_uint8 *addr );
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89
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90 cyg_uint8 *
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91 aligndown( cyg_uint8 *addr );
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92
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93 // round up addresses according to required alignment of metadata
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94 cyg_uint8 *
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95 alignmetaup( cyg_uint8 *addr );
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96
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97 cyg_uint8 *
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98 alignmetadown( cyg_uint8 *addr );
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99
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100 // return the alloced dq at mem
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101 struct memdq *
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102 find_alloced_dq( cyg_uint8 *mem );
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103
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104 // returns a free dq of at least size, or NULL if none
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105 struct memdq *
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106 find_free_dq( cyg_int32 size );
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107
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108 // returns the free dq following mem
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109 struct memdq *
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110 find_free_dq_slot( cyg_uint8 *mem );
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111
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112 void
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113 insert_free_block( struct memdq *freedq );
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114
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115 static void
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116 copy_data( cyg_uint8 *dst, cyg_uint8 *src, cyg_int32 nbytes );
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117
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118 void
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119 check_free_memdq( struct memdq *dq );
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120
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121 void
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122 check_alloced_memdq( struct memdq *dq );
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123
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124 public:
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125 // THIS is the public API of memory pools generally that can have the
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126 // kernel oriented thread-safe package layer atop.
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127
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128 struct constructorargs {
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129 cyg_int32 alignment;
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130 cyg_uint8 *metabase;
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131 cyg_uint32 metasize;
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132 constructorargs(cyg_int32 align, cyg_uint8 *mbase, cyg_uint32 msize)
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133 {
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134 alignment = align; metabase = mbase; metasize = msize;
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135 }
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136 };
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137
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138 // Constructor: gives the base and size of the arena in which memory is
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139 // to be carved out.
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140 Cyg_Mempool_Sepmeta_Implementation(
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141 cyg_uint8 * /* base */,
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142 cyg_int32 /* size */,
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143 CYG_ADDRWORD /* constructorargs */ );
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144
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145 // Destructor
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146 ~Cyg_Mempool_Sepmeta_Implementation();
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147
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148 // get size bytes of memory
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149 cyg_uint8 *
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150 try_alloc( cyg_int32 /* size */ );
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151
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152 // resize existing allocation, if oldsize is non-NULL, previous
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153 // allocation size is placed into it. If previous size not available,
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154 // it is set to 0. NB previous allocation size may have been rounded up.
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155 // Occasionally the allocation can be adjusted *backwards* as well as,
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156 // or instead of forwards, therefore the address of the resized
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157 // allocation is returned, or NULL if no resizing was possible.
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158 // Note that this differs from ::realloc() in that no attempt is
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159 // made to call malloc() if resizing is not possible - that is left
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160 // to higher layers. The data is copied from old to new though.
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161 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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162 cyg_uint8 *
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163 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
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164 cyg_int32 * /* oldsize */ );
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165
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166 // free size bytes of memory back to the pool
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167 // returns true on success
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168 cyg_bool
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169 free( cyg_uint8 * /* ptr */,
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170 cyg_int32 /* size */ );
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171
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172 // Get memory pool status
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173 // flags is a bitmask of requested fields to fill in. The flags are
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174 // defined in common.hxx
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175 void
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176 get_status( cyg_mempool_status_flag_t /* flags */,
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177 Cyg_Mempool_Status & /* status */ );
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178
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179 };
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180
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181 #include <cyg/memalloc/sepmetaimpl.inl>
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182
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183 // -------------------------------------------------------------------------
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184 #endif // ifndef CYGONCE_MEMALLOC_SEPMETAIMPL_HXX
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185 // EOF sepmetaimpl.hxx