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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
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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 //==========================================================================
208
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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.
210
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40 // at http://sources.redhat.com/ecos/ecos-license/
208
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
115
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): jlarmour
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47 // Contributors:
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48 // Date: 2000-06-18
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49 // Purpose: Define standard interface to Doug Lea's malloc implementation
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50 // Description: Doug Lea's malloc has been ported to eCos. This file provides
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51 // the interface between the implementation and the standard
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52 // memory allocator interface required by eCos
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53 // Usage: #include <cyg/memalloc/dlmalloc.hxx>
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54 //
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55 //
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56 //####DESCRIPTIONEND####
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57 //
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58 //==========================================================================
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59
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60 // CONFIGURATION
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61
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62 #include <pkgconf/memalloc.h>
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63
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64 // INCLUDES
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65
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66 #include <stddef.h> // size_t, ptrdiff_t
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67 #include <cyg/infra/cyg_type.h> // types
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68
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69 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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70
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71 // As a special case, override CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE
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72 // if the malloc config says so
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73 #ifdef CYGIMP_MEMALLOC_MALLOC_DLMALLOC
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74 // forward declaration to prevent header dependency problems
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75 class Cyg_Mempool_dlmalloc;
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76 # include <pkgconf/heaps.hxx>
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77 # if (CYGMEM_HEAP_COUNT > 1) && \
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78 !defined(CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE)
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79 # define CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE 1
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80 # endif
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81 #endif
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82
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83 // CONSTANTS
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84
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85 // number of bins - but changing this alone will not change the number of
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86 // bins!
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87 #define CYGPRI_MEMALLOC_ALLOCATOR_DLMALLOC_NAV 128
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88
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89 // TYPE DEFINITIONS
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90
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91
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92 class Cyg_Mempool_dlmalloc_Implementation
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93 {
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94 public:
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95 /* cyg_dlmalloc_size_t is the word-size used for internal bookkeeping
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96 of chunk sizes. On a 64-bit machine, you can reduce malloc
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97 overhead, especially for very small chunks, by defining
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98 cyg_dlmalloc_size_t to be a 32-bit type at the expense of not
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99 being able to handle requests greater than 2^31. This limitation is
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100 hardly ever a concern; you are encouraged to set this. However, the
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101 default version is the same as size_t. */
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102
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103 typedef size_t Cyg_dlmalloc_size_t;
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104
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105 typedef struct malloc_chunk
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106 {
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107 Cyg_dlmalloc_size_t prev_size; /* Size of previous chunk (if free). */
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108 Cyg_dlmalloc_size_t size; /* Size in bytes, including overhead. */
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109 struct malloc_chunk* fd; /* double links -- used only if free. */
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110 struct malloc_chunk* bk;
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111 };
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112
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113 protected:
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114 /* The first value returned from sbrk */
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115 cyg_uint8 *arenabase;
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116
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117 /* The total memory in the pool */
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118 cyg_int32 arenasize;
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119
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120 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_SAFE_MULTIPLE
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121 struct Cyg_Mempool_dlmalloc_Implementation::malloc_chunk *
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122 av_[ CYGPRI_MEMALLOC_ALLOCATOR_DLMALLOC_NAV * 2 + 2 ];
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123 #endif
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124
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125 #ifdef CYGDBG_MEMALLOC_ALLOCATOR_DLMALLOC_DEBUG
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126
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127 void
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128 do_check_chunk( struct malloc_chunk * );
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129
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130 void
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131 do_check_free_chunk( struct malloc_chunk * );
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132
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133 void
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134 do_check_inuse_chunk( struct malloc_chunk * );
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135
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136 void
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137 do_check_malloced_chunk( struct malloc_chunk *, Cyg_dlmalloc_size_t );
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138 #endif
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139
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140 public:
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141 // Constructor: gives the base and size of the arena in which memory is
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142 // to be carved out, note that management structures are taken from the
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143 // same arena.
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144 Cyg_Mempool_dlmalloc_Implementation( cyg_uint8 * /* base */,
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145 cyg_int32 /* size */,
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146 CYG_ADDRWORD /* argthru */ );
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147
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148 // Destructor
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149 ~Cyg_Mempool_dlmalloc_Implementation() {}
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150
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151 // get some memory, return NULL if none available
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152 cyg_uint8 *
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153 try_alloc( cyg_int32 /* size */ );
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154
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155 // resize existing allocation, if oldsize is non-NULL, previous
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156 // allocation size is placed into it. If previous size not available,
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157 // it is set to 0. NB previous allocation size may have been rounded up.
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158 // Occasionally the allocation can be adjusted *backwards* as well as,
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159 // or instead of forwards, therefore the address of the resized
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160 // allocation is returned, or NULL if no resizing was possible.
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161 // Note that this differs from ::realloc() in that no attempt is
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162 // made to call malloc() if resizing is not possible - that is left
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163 // to higher layers. The data is copied from old to new though.
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164 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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165 cyg_uint8 *
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166 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
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167 cyg_int32 * /* oldsize */ );
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168
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169 // free the memory back to the pool
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170 // returns true on success
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171 cyg_bool
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172 free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ =0 );
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173
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174 // Get memory pool status
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175 // flags is a bitmask of requested fields to fill in. The flags are
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176 // defined in common.hxx
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177 void
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178 get_status( cyg_mempool_status_flag_t /* flags */,
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179 Cyg_Mempool_Status & /* status */ );
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180
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181 };
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182
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183 #endif // ifndef CYGONCE_MEMALLOC_DLMALLOCIMPL_HXX
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184 // EOF dlmallocimpl.hxx