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annotate packages/services/memalloc/common/current/include/memvar.hxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents d63db767121d
children d2c90368aeef
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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 //==========================================================================
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.
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40 // at http://sources.redhat.com/ecos/ecos-license
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): dsm, jlarmour
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47 // Contributors:
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48 // Date: 2000-06-12
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49 // Purpose: Define Memvar class interface
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50 // Description: Inline class for constructing a variable block allocator
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51 // Usage: #include <cyg/memalloc/memvar.hxx>
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52 //
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53 //
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54 //####DESCRIPTIONEND####
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55 //
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56 //==========================================================================
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57
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58 // CONFIGURATION
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59
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60 #include <pkgconf/memalloc.h>
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61 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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62 # include <pkgconf/system.h>
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63 # ifdef CYGPKG_KERNEL
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64 # include <pkgconf/kernel.h>
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65 # endif
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66 #endif
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67
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68 // when used as an implementation for malloc, we need the following
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69 // to let the system know the name of the class
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70 #define CYGCLS_MEMALLOC_MALLOC_IMPL Cyg_Mempool_Variable
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71
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72 // if the implementation is all that's required, don't output anything else
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73 #ifndef __MALLOC_IMPL_WANTED
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74 // INCLUDES
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75
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76 #include <cyg/infra/cyg_type.h> // types
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77 #include <cyg/infra/cyg_ass.h> // assertion macros
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78
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79 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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80 # include <cyg/kernel/ktypes.h> // cyg_tick_count
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81 #endif
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82
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83 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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84 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
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85 #endif
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86
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87 #include <cyg/memalloc/mvarimpl.hxx> // implementation of a variable mem pool
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88 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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89
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90
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91 // TYPE DEFINITIONS
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92
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93 class Cyg_Mempool_Variable
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94 {
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95 protected:
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96 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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97 Cyg_Mempolt2<Cyg_Mempool_Variable_Implementation> mypool;
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98 #else
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99 Cyg_Mempool_Variable_Implementation mypool;
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100 #endif
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101
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102 public:
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103 // This API makes concrete a class which implements a thread-safe
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104 // kernel-savvy memory pool which manages variable size blocks.
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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, note that management structures are taken from the
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108 // same arena.
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109 Cyg_Mempool_Variable( cyg_uint8 * /* base */, cyg_int32 /* size */,
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110 cyg_int32 /* alignment */=8);
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111
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112 // Destructor
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113 ~Cyg_Mempool_Variable();
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114
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115 // get some memory; wait if none available
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116 // if we aren't configured to be thread-aware this is irrelevant
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117 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_VARIABLE_THREADAWARE
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118 cyg_uint8 *
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119 alloc( cyg_int32 /* size */ );
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120
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121 # ifdef CYGFUN_KERNEL_THREADS_TIMER
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122 // get some memory with a timeout
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123 cyg_uint8 *
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124 alloc( cyg_int32 /* size */, cyg_tick_count /* delay_timeout */ );
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125 # endif
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126 #endif
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127
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128 // get some memory, return NULL if none available
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129 cyg_uint8 *
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130 try_alloc( cyg_int32 /* size */ );
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131
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132 // resize existing allocation, if oldsize is non-NULL, previous
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133 // allocation size is placed into it. If previous size not available,
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134 // it is set to 0. NB previous allocation size may have been rounded up.
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135 // Occasionally the allocation can be adjusted *backwards* as well as,
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136 // or instead of forwards, therefore the address of the resized
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137 // allocation is returned, or NULL if no resizing was possible.
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138 // Note that this differs from ::realloc() in that no attempt is
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139 // made to call malloc() if resizing is not possible - that is left
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140 // to higher layers. The data is copied from old to new though.
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141 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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142 cyg_uint8 *
165
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143 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
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144 cyg_int32 * /* oldsize */ =NULL );
115
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145
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146 // free the memory back to the pool
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147 // returns true on success
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148 cyg_bool
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149 free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ =0 );
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150
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151 // Get memory pool status
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152 // flags is a bitmask of requested fields to fill in. The flags are
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153 // defined in common.hxx
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154 void
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155 get_status( cyg_mempool_status_flag_t /* flags */,
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156 Cyg_Mempool_Status & /* status */ );
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157
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158 CYGDBG_DEFINE_CHECK_THIS
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159 };
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160
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161 #endif // ifndef __MALLOC_IMPL_WANTED
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162
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163 #endif // ifndef CYGONCE_MEMALLOC_MEMVAR_HXX
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164 // EOF memvar.hxx