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annotate packages/services/memalloc/common/current/include/memjoin.inl @ 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 f2545e5de153
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1 #ifndef CYGONCE_MEMALLOC_MEMJOIN_INL
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2 #define CYGONCE_MEMALLOC_MEMJOIN_INL
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3
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4 //==========================================================================
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5 //
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6 // memjoin.inl
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7 //
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8 // Pseudo memory pool used to join together other memory pools
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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: 2000-06-12
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40 // Purpose: Implement joined up memory pool class interface
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41 // Description: Inline class for constructing a pseudo allocator that contains
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42 // multiple other allocators. It caters solely to the requirements
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43 // of the malloc implementation.
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44 // Usage: #include <cyg/memalloc/memjoin.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 <cyg/infra/cyg_type.h> // types
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58 #include <cyg/infra/cyg_ass.h> // assertion macros
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59 #include <cyg/infra/cyg_trac.h> // tracing macros
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60 #include <cyg/memalloc/memjoin.hxx> // header for this file just in case
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61
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62
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63 // FUNCTIONS
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64
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65
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66 // -------------------------------------------------------------------------
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67 // find_pool_for_ptr returns the pool that ptr came from
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68
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69 template <class T>
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70 inline T *
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71 Cyg_Mempool_Joined<T>::find_pool_for_ptr( const cyg_uint8 *ptr )
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72 {
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73 cyg_uint8 i;
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74
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75 for ( i=0; i < poolcount; i++ ) {
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76 if ( ptr >= pools[i].startaddr &&
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77 ptr < pools[i].endaddr ) {
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78 return pools[i].pool;
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79 } // if
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80 } // for
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81 return NULL;
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82 } // Cyg_Mempool_Joined<T>::find_pool_for_ptr()
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83
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84
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85 // -------------------------------------------------------------------------
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86 // Constructor
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87 template <class T>
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88 inline
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89 Cyg_Mempool_Joined<T>::Cyg_Mempool_Joined( cyg_uint8 num_heaps, T *heaps[] )
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90 {
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91 Cyg_Mempool_Status stat;
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92 cyg_uint8 i;
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93
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94 CYG_REPORT_FUNCTION();
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95 CYG_REPORT_FUNCARG2( "num_heaps=%u, heaps=%08x", (int)num_heaps, heaps );
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96
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97 CYG_CHECK_DATA_PTRC( heaps );
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98
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99 poolcount = num_heaps;
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100
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101 // allocate internal structures - this should work because we should be
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102 // the first allocation for this pool; and if there isn't enough space
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103 // for these teeny bits, what hope is there!
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104 for (i=0; i<num_heaps; i++) {
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105 pools = (struct pooldesc *)
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106 heaps[i]->try_alloc( num_heaps * sizeof(struct pooldesc) );
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107 if ( NULL != pools )
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108 break;
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109 } // for
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110
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111 CYG_ASSERT( pools != NULL,
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112 "Couldn't allocate internal structures from any pools!");
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113
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114 // now set up internal structures
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115 for (i=0; i<num_heaps; i++) {
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116 pools[i].pool = heaps[i];
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117 heaps[i]->get_status( CYG_MEMPOOL_STAT_ARENABASE|
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118 CYG_MEMPOOL_STAT_ARENASIZE,
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119 stat );
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120
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121 CYG_ASSERT( stat.arenabase != (const cyg_uint8 *)-1,
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122 "pool returns valid pool base" );
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123 CYG_CHECK_DATA_PTR( stat.arenabase, "Bad arena location" );
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124 CYG_ASSERT( stat.arenasize > 0, "pool returns valid pool size" );
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125
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126 pools[i].startaddr = stat.arenabase;
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127 pools[i].endaddr = stat.arenabase + stat.arenasize;
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128 } // for
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129
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130 CYG_REPORT_RETURN();
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131 } // Cyg_Mempool_Joined<T>::Cyg_Mempool_Joined()
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132
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133
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134
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135 // -------------------------------------------------------------------------
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136 // Destructor
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137 template <class T>
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138 inline
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139 Cyg_Mempool_Joined<T>::~Cyg_Mempool_Joined()
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140 {
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141 CYG_REPORT_FUNCTION();
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142 CYG_REPORT_FUNCARGVOID();
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143 CYG_ASSERT( free( (cyg_uint8 *)pools, poolcount * sizeof(struct pooldesc) ),
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144 "free failed!");
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145 CYG_REPORT_RETURN();
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146 } // Cyg_Mempool_Joined<T>::~Cyg_Mempool_Joined()
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147
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148
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149
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150 // -------------------------------------------------------------------------
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151 // get some memory, return NULL if none available
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152 template <class T>
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153 inline cyg_uint8 *
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154 Cyg_Mempool_Joined<T>::try_alloc( cyg_int32 size )
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155 {
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156 cyg_uint8 i;
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157 cyg_uint8 *ptr=NULL;
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158
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159 CYG_REPORT_FUNCTYPE( "returning memory at addr %08x" );
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160 CYG_REPORT_FUNCARG1DV( size );
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161
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162 for (i=0; i<poolcount; i++) {
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163 ptr = pools[i].pool->try_alloc( size );
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164 if ( NULL != ptr )
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165 break;
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166 }
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167
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168 CYG_REPORT_RETVAL( ptr );
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169 return ptr;
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170 } // Cyg_Mempool_Joined<T>::try_alloc()
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171
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172
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173 // -------------------------------------------------------------------------
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174 // resize existing allocation, if oldsize is non-NULL, previous
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175 // allocation size is placed into it. If previous size not available,
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176 // it is set to 0. NB previous allocation size may have been rounded up.
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177 // Occasionally the allocation can be adjusted *backwards* as well as,
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178 // or instead of forwards, therefore the address of the resized
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179 // allocation is returned, or NULL if no resizing was possible.
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180 // Note that this differs from ::realloc() in that no attempt is
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181 // made to call malloc() if resizing is not possible - that is left
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182 // to higher layers. The data is copied from old to new though.
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183 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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184 template <class T>
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185 inline cyg_uint8 *
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186 Cyg_Mempool_Joined<T>::resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
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187 cyg_int32 *oldsize=NULL )
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188 {
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189 T *pool;
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190 cyg_bool ret;
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191
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192 CYG_REPORT_FUNCTYPE( "success=" );
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193 CYG_REPORT_FUNCARG3( "alloc_ptr=%08x, newsize=%d, &oldsize=%08x",
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194 alloc_ptr, newsize, oldsize );
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195 CYG_CHECK_DATA_PTRC( alloc_ptr );
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196 if (NULL != oldsize )
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197 CYG_CHECK_DATA_PTRC( oldsize );
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198
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199 pool = find_pool_for_ptr( alloc_ptr );
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200 CYG_ASSERT( NULL != pool, "Couldn't find pool for pointer!" );
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201
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202 ret = pool->resize_alloc( alloc_ptr, newsize, oldsize );
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203
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204 CYG_REPORT_RETVAL( ret );
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205 return ret;
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206 } // Cyg_Mempool_Joined<T>::resize_alloc()
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207
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208
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209 // -------------------------------------------------------------------------
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210 // free the memory back to the pool
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211 // returns true on success
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212 template <class T>
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213 inline cyg_bool
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214 Cyg_Mempool_Joined<T>::free( cyg_uint8 *ptr, cyg_int32 size )
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215 {
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216 T *pool;
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217 cyg_bool ret;
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218
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219 CYG_REPORT_FUNCTYPE("success=");
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220 CYG_REPORT_FUNCARG2( "ptr=%08x, size=%d", ptr, size );
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221 CYG_CHECK_DATA_PTRC( ptr );
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222
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223 pool = find_pool_for_ptr( ptr );
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224 CYG_ASSERT( NULL != pool, "Couldn't find pool for pointer!" );
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225
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226 ret = pool->free( ptr, size );
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227
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228 CYG_REPORT_RETVAL( ret );
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229 return ret;
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230 } // Cyg_Mempool_Joined<T>::free()
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231
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232
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233 // -------------------------------------------------------------------------
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234 // Get memory pool status
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235 // flags is a bitmask of requested fields to fill in. The flags are
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236 // defined in common.hxx
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237 template <class T>
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238 inline void
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239 Cyg_Mempool_Joined<T>::get_status( cyg_mempool_status_flag_t flags,
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240 Cyg_Mempool_Status &status )
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241 {
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242 cyg_uint8 i;
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243 Cyg_Mempool_Status tmpstat;
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244
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245 status.arenasize = status.freeblocks = 0;
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246 status.totalallocated = status.totalfree = 0;
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247 status.maxfree = status.origsize = 0;
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248
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249 for ( i=0; i<poolcount; i++ ) {
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250 if ( status.arenasize >= 0 ) {
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251 if ( 0 != (flags & CYG_MEMPOOL_STAT_ARENASIZE) ) {
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252 pools[i].pool->get_status( CYG_MEMPOOL_STAT_ARENASIZE,
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253 tmpstat );
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254 if ( tmpstat.arenasize > 0)
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255 status.arenasize += tmpstat.arenasize;
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256 else
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257 status.arenasize = -1;
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258 } // if
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259 } // if
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260
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261 if ( status.freeblocks >= 0 ) {
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262 if ( 0 != (flags & CYG_MEMPOOL_STAT_FREEBLOCKS) ) {
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263 pools[i].pool->get_status( CYG_MEMPOOL_STAT_FREEBLOCKS,
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264 tmpstat );
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265 if ( tmpstat.freeblocks > 0 )
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266 status.freeblocks += tmpstat.freeblocks;
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267 else
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268 status.freeblocks = -1;
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269 } // if
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270 } // if
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271
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272 if ( status.totalallocated >= 0 ) {
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273 if ( 0 != (flags & CYG_MEMPOOL_STAT_TOTALALLOCATED) ) {
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274 pools[i].pool->get_status( CYG_MEMPOOL_STAT_TOTALALLOCATED,
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275 tmpstat );
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276 if ( tmpstat.totalallocated > 0 )
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277 status.totalallocated += tmpstat.totalallocated;
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278 else
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279 status.totalallocated = -1;
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280 } // if
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281 } // if
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282
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283 if ( status.totalfree >= 0 ) {
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284 if ( 0 != (flags & CYG_MEMPOOL_STAT_TOTALFREE) ) {
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285 pools[i].pool->get_status( CYG_MEMPOOL_STAT_TOTALFREE,
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286 tmpstat );
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287 if ( tmpstat.totalfree > 0 )
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288 status.totalfree += tmpstat.totalfree;
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289 else
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290 status.totalfree = -1;
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291 } // if
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292 } // if
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293
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294 if ( status.maxfree >= 0 ) {
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295 if ( 0 != (flags & CYG_MEMPOOL_STAT_MAXFREE) ) {
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296 pools[i].pool->get_status( CYG_MEMPOOL_STAT_MAXFREE, tmpstat );
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297 if ( tmpstat.maxfree < 0 )
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298 status.maxfree = -1;
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299 else if ( tmpstat.maxfree > status.maxfree )
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300 status.maxfree = tmpstat.maxfree;
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301 } // if
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302 } // if
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303
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304 if ( status.origsize >= 0 ) {
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305 if ( 0 != (flags & CYG_MEMPOOL_STAT_ORIGSIZE) ) {
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306 pools[i].pool->get_status( CYG_MEMPOOL_STAT_ORIGSIZE, tmpstat );
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307 if ( tmpstat.origsize > 0 )
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308 status.origsize += tmpstat.origsize;
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309 else
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310 status.origsize = -1;
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311 } // if
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312 } // if
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313
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314 if ( status.maxoverhead >= 0 ) {
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315 if ( 0 != (flags & CYG_MEMPOOL_STAT_MAXOVERHEAD) ) {
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316 pools[i].pool->get_status( CYG_MEMPOOL_STAT_MAXOVERHEAD,
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317 tmpstat );
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318 if ( tmpstat.maxoverhead < 0 )
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319 status.maxoverhead = -1;
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320 else if ( tmpstat.maxoverhead > status.maxoverhead )
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321 status.maxoverhead = tmpstat.maxoverhead;
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322 } // if
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323 } // if
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324 } // for
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325 } // Cyg_Mempool_Joined<T>::get_status()
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326
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327
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328 // -------------------------------------------------------------------------
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329
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330 #endif // ifndef CYGONCE_MEMALLOC_MEMJOIN_INL
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331 // EOF memjoin.inl