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annotate packages/services/memalloc/common/current/include/dlmallocimpl.hxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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1 #ifndef CYGONCE_MEMALLOC_DLMALLOCIMPL_HXX
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2 #define CYGONCE_MEMALLOC_DLMALLOCIMPL_HXX
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3
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4 //==========================================================================
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5 //
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6 // dlmallocimpl.hxx
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7 //
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8 // Interface to the port of Doug Lea's malloc implementation
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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 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: 2000-06-18
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40 // Purpose: Define standard interface to Doug Lea's malloc implementation
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41 // Description: Doug Lea's malloc has been ported to eCos. This file provides
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42 // the interface between the implementation and the standard
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43 // memory allocator interface required by eCos
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44 // Usage: #include <cyg/memalloc/dlmalloc.hxx>
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45 //
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46 //
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47 //####DESCRIPTIONEND####
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48 //
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49 //==========================================================================
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50
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51 // CONFIGURATION
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52
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53 #include <pkgconf/memalloc.h>
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54
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55 // INCLUDES
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56
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57 #include <stddef.h> // size_t, ptrdiff_t
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58 #include <cyg/infra/cyg_type.h> // types
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59
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60 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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61
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62 // As a special case, override CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE
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63 // if the malloc config says so
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64 #ifdef CYGIMP_MEMALLOC_MALLOC_DLMALLOC
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65 // forward declaration to prevent header dependency problems
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66 class Cyg_Mempool_dlmalloc;
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67 # include <pkgconf/heaps.hxx>
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68 # if (CYGMEM_HEAP_COUNT > 1) && \
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69 !defined(CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE)
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70 # define CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE 1
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71 # endif
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72 #endif
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73
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74 // CONSTANTS
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75
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76 // number of bins - but changing this alone will not change the number of
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77 // bins!
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78 #define CYGPRI_MEMALLOC_ALLOCATOR_DLMALLOC_NAV 128
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79
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80 // TYPE DEFINITIONS
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81
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82
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83 class Cyg_Mempool_dlmalloc_Implementation
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84 {
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85 public:
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86 /* cyg_dlmalloc_size_t is the word-size used for internal bookkeeping
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87 of chunk sizes. On a 64-bit machine, you can reduce malloc
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88 overhead, especially for very small chunks, by defining
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89 cyg_dlmalloc_size_t to be a 32-bit type at the expense of not
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90 being able to handle requests greater than 2^31. This limitation is
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91 hardly ever a concern; you are encouraged to set this. However, the
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92 default version is the same as size_t. */
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93
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94 typedef size_t Cyg_dlmalloc_size_t;
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95
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96 typedef struct malloc_chunk
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97 {
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98 Cyg_dlmalloc_size_t prev_size; /* Size of previous chunk (if free). */
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99 Cyg_dlmalloc_size_t size; /* Size in bytes, including overhead. */
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100 struct malloc_chunk* fd; /* double links -- used only if free. */
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101 struct malloc_chunk* bk;
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102 };
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103
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104 protected:
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105 /* The first value returned from sbrk */
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106 cyg_uint8 *arenabase;
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107
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108 /* The total memory in the pool */
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109 cyg_int32 arenasize;
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110
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111 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE
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112 struct Cyg_Mempool_dlmalloc_Implementation::malloc_chunk *
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113 av_[ CYGPRI_MEMALLOC_ALLOCATOR_DLMALLOC_NAV * 2 + 2 ];
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114 #endif
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115
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116 #ifdef CYGDBG_MEMALLOC_ALLOCATOR_DLMALLOC_DEBUG
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117
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118 void
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119 do_check_chunk( struct malloc_chunk * );
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120
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121 void
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122 do_check_free_chunk( struct malloc_chunk * );
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123
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124 void
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125 do_check_inuse_chunk( struct malloc_chunk * );
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126
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127 void
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128 do_check_malloced_chunk( struct malloc_chunk *, Cyg_dlmalloc_size_t );
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129 #endif
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130
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131 public:
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132 // Constructor: gives the base and size of the arena in which memory is
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133 // to be carved out, note that management structures are taken from the
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134 // same arena.
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135 Cyg_Mempool_dlmalloc_Implementation( cyg_uint8 * /* base */,
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136 cyg_int32 /* size */,
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137 CYG_ADDRWORD /* argthru */ );
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138
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139 // Destructor
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140 ~Cyg_Mempool_dlmalloc_Implementation() {}
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141
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142 // get some memory, return NULL if none available
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143 cyg_uint8 *
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144 try_alloc( cyg_int32 /* size */ );
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145
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146 // resize existing allocation, if oldsize is non-NULL, previous
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147 // allocation size is placed into it. If previous size not available,
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148 // it is set to 0. NB previous allocation size may have been rounded up.
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149 // Occasionally the allocation can be adjusted *backwards* as well as,
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150 // or instead of forwards, therefore the address of the resized
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151 // allocation is returned, or NULL if no resizing was possible.
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152 // Note that this differs from ::realloc() in that no attempt is
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153 // made to call malloc() if resizing is not possible - that is left
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154 // to higher layers. The data is copied from old to new though.
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155 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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156 cyg_uint8 *
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157 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
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158 cyg_int32 * /* oldsize */ );
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159
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160 // free the memory back to the pool
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161 // returns true on success
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162 cyg_bool
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163 free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ =0 );
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164
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165 // Get memory pool status
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166 // flags is a bitmask of requested fields to fill in. The flags are
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167 // defined in common.hxx
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168 void
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169 get_status( cyg_mempool_status_flag_t /* flags */,
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170 Cyg_Mempool_Status & /* status */ );
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171
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172 };
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173
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174 #endif // ifndef CYGONCE_MEMALLOC_DLMALLOCIMPL_HXX
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175 // EOF dlmallocimpl.hxx