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annotate packages/services/memalloc/common/current/include/memvar.hxx @ 165:d63db767121d

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Merge from eCos master repository on 2001-06-29-06:43:03-BST
author jlarmour
date Fri, 29 Jun 2001 07:16:25 +0000
parents 6ed91473a1cd
children e0c0827131d1
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1 #ifndef CYGONCE_MEMALLOC_MEMVAR_HXX
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2 #define CYGONCE_MEMALLOC_MEMVAR_HXX
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3
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4 //==========================================================================
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5 //
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6 // memvar.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 //####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): dsm, jlarmour
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38 // Contributors:
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39 // Date: 2000-06-12
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40 // Purpose: Define Memvar class interface
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41 // Description: Inline class for constructing a variable block allocator
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42 // Usage: #include <cyg/memalloc/memvar.hxx>
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43 //
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44 //
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45 //####DESCRIPTIONEND####
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46 //
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47 //==========================================================================
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48
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49 // CONFIGURATION
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50
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51 #include <pkgconf/memalloc.h>
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52 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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53 # include <pkgconf/system.h>
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54 # ifdef CYGPKG_KERNEL
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55 # include <pkgconf/kernel.h>
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56 # endif
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57 #endif
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58
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59 // when used as an implementation for malloc, we need the following
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60 // to let the system know the name of the class
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61 #define CYGCLS_MEMALLOC_MALLOC_IMPL Cyg_Mempool_Variable
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62
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63 // if the implementation is all that's required, don't output anything else
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64 #ifndef __MALLOC_IMPL_WANTED
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65 // INCLUDES
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66
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67 #include <cyg/infra/cyg_type.h> // types
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68 #include <cyg/infra/cyg_ass.h> // assertion macros
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69
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70 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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71 # include <cyg/kernel/ktypes.h> // cyg_tick_count
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72 #endif
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73
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74 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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75 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
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76 #endif
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77
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78 #include <cyg/memalloc/mvarimpl.hxx> // implementation of a variable mem pool
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79 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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80
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81
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82 // TYPE DEFINITIONS
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83
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84 class Cyg_Mempool_Variable
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85 {
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86 protected:
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87 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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88 Cyg_Mempolt2<Cyg_Mempool_Variable_Implementation> mypool;
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89 #else
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90 Cyg_Mempool_Variable_Implementation mypool;
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91 #endif
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92
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93 public:
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94 // This API makes concrete a class which implements a thread-safe
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95 // kernel-savvy memory pool which manages variable size blocks.
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96
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97 // Constructor: gives the base and size of the arena in which memory is
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98 // to be carved out, note that management structures are taken from the
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99 // same arena.
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100 Cyg_Mempool_Variable( cyg_uint8 * /* base */, cyg_int32 /* size */,
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101 cyg_int32 /* alignment */=8);
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102
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103 // Destructor
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104 ~Cyg_Mempool_Variable();
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105
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106 // get some memory; wait if none available
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107 // if we aren't configured to be thread-aware this is irrelevant
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108 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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109 cyg_uint8 *
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110 alloc( cyg_int32 /* size */ );
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111
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112 # ifdef CYGFUN_KERNEL_THREADS_TIMER
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113 // get some memory with a timeout
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114 cyg_uint8 *
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115 alloc( cyg_int32 /* size */, cyg_tick_count /* delay_timeout */ );
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116 # endif
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117 #endif
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118
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119 // get some memory, return NULL if none available
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120 cyg_uint8 *
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121 try_alloc( cyg_int32 /* size */ );
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122
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123 // resize existing allocation, if oldsize is non-NULL, previous
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124 // allocation size is placed into it. If previous size not available,
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125 // it is set to 0. NB previous allocation size may have been rounded up.
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126 // Occasionally the allocation can be adjusted *backwards* as well as,
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127 // or instead of forwards, therefore the address of the resized
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128 // allocation is returned, or NULL if no resizing was possible.
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129 // Note that this differs from ::realloc() in that no attempt is
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130 // made to call malloc() if resizing is not possible - that is left
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131 // to higher layers. The data is copied from old to new though.
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132 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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133 cyg_uint8 *
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134 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
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135 cyg_int32 * /* oldsize */ =NULL );
115
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136
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137 // free the memory back to the pool
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138 // returns true on success
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139 cyg_bool
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140 free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ =0 );
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141
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142 // Get memory pool status
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143 // flags is a bitmask of requested fields to fill in. The flags are
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144 // defined in common.hxx
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145 void
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146 get_status( cyg_mempool_status_flag_t /* flags */,
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147 Cyg_Mempool_Status & /* status */ );
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148
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149 CYGDBG_DEFINE_CHECK_THIS
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150 };
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151
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152 #endif // ifndef __MALLOC_IMPL_WANTED
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153
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154 #endif // ifndef CYGONCE_MEMALLOC_MEMVAR_HXX
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155 // EOF memvar.hxx