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annotate packages/services/memalloc/common/current/include/mvarimpl.hxx @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents d2c90368aeef
children
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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 Free Software Foundation, 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
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19 // version.
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20 //
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21 // eCos is distributed in the hope that it will be useful, but WITHOUT
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22 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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23 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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24 // for more details.
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25 //
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26 // You should have received a copy of the GNU General Public License
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27 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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28 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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29 //
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30 // As a special exception, if other files instantiate templates or use
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31 // macros or inline functions from this file, or you compile this file
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32 // and link it with other works to produce a work based on this file,
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33 // this file does not by itself cause the resulting work to be covered by
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34 // the GNU General Public License. However the source code for this file
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35 // must still be made available in accordance with section (3) of the GNU
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36 // General Public License v2.
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37 //
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38 // This exception does not invalidate any other reasons why a work based
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39 // on this file might be covered by the GNU General Public License.
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40 // -------------------------------------------
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41 // ####ECOSGPLCOPYRIGHTEND####
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42 //==========================================================================
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43 //#####DESCRIPTIONBEGIN####
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44 //
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45 // Author(s): dsm, jlarmour
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46 // Contributors:
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47 // Date: 2000-06-12
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48 // Purpose: Define Mvarimpl class interface
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49 // Description: Inline class for constructing a variable block allocator
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50 // Usage: #include <cyg/memalloc/mvarimpl.hxx>
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51 //
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52 //
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53 //####DESCRIPTIONEND####
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54 //
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55 //==========================================================================
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56
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57
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58 #include <cyg/infra/cyg_type.h>
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59 #include <pkgconf/memalloc.h>
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60 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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61
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62 class Cyg_Mempool_Variable_Implementation {
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63 protected:
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64 // these constructors are explicitly disallowed
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65 Cyg_Mempool_Variable_Implementation() {};
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66 // Cyg_Mempool_Variable_Implementation( Cyg_Mempool_Variable_Implementation &ref )
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67 // {};
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68 Cyg_Mempool_Variable_Implementation &
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69 operator=( Cyg_Mempool_Variable_Implementation &ref )
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70 { return ref; };
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71
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72 struct memdq {
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73 struct memdq *prev, *next;
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74 cyg_int32 size;
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75 };
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76
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77 struct memdq head;
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78 cyg_uint8 *obase;
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79 cyg_int32 osize;
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80 cyg_uint8 *bottom;
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81 cyg_uint8 *top;
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82 cyg_int32 alignment;
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83 cyg_int32 freemem;
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84
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85 // round up size passed to alloc/free to a size that will be used
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86 // for allocation
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87 cyg_int32
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88 roundup(cyg_int32 size);
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89
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90 struct memdq *
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91 addr2memdq( cyg_uint8 *addr );
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92
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93 struct memdq *
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94 alloc2memdq( cyg_uint8 *addr );
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95
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96 cyg_uint8 *
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97 memdq2alloc( struct memdq *dq );
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98
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99 void
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100 insert_free_block( struct memdq *freedq );
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101
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102 public:
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103 // THIS is the public API of memory pools generally that can have the
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104 // kernel oriented thread-safe package layer atop.
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105
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106 // Constructor: gives the base and size of the arena in which memory is
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107 // to be carved out.
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108 Cyg_Mempool_Variable_Implementation(
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109 cyg_uint8 * /* base */,
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110 cyg_int32 /* size */,
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111 CYG_ADDRWORD /* alignment */ = 8 );
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112
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113 // Destructor
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114 ~Cyg_Mempool_Variable_Implementation();
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115
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116 // get size bytes of memory
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117 cyg_uint8 *
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118 try_alloc( cyg_int32 /* size */ );
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119
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120 // resize existing allocation, if oldsize is non-NULL, previous
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121 // allocation size is placed into it. If previous size not available,
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122 // it is set to 0. NB previous allocation size may have been rounded up.
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123 // Occasionally the allocation can be adjusted *backwards* as well as,
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124 // or instead of forwards, therefore the address of the resized
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125 // allocation is returned, or NULL if no resizing was possible.
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126 // Note that this differs from ::realloc() in that no attempt is
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127 // made to call malloc() if resizing is not possible - that is left
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128 // to higher layers. The data is copied from old to new though.
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129 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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130 cyg_uint8 *
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131 resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
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132 cyg_int32 *oldsize );
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133
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134 // free size bytes of memory back to the pool
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135 // returns true on success
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136 cyg_bool
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137 free( cyg_uint8 * /* ptr */,
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138 cyg_int32 /* size */ );
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139
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140 // Get memory pool status
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141 // flags is a bitmask of requested fields to fill in. The flags are
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142 // defined in common.hxx
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143 void
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144 get_status( cyg_mempool_status_flag_t /* flags */,
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145 Cyg_Mempool_Status & /* status */ );
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146
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147 };
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148
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149 #include <cyg/memalloc/mvarimpl.inl>
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150
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151 // -------------------------------------------------------------------------
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152 #endif // ifndef CYGONCE_MEMALLOC_MVARIMPL_HXX
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153 // EOF mvarimpl.hxx