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1 //========================================================================== |
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2 // |
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3 // memfixed.cxx |
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4 // |
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5 // Memory pool with fixed block class declarations |
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6 // |
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7 //========================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): hmt |
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33 // Contributors: hmt |
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34 // Date: 1998-03-23 |
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35 // Purpose: Define Memfixed class interface |
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36 // Description: Inline class for constructing a fixed block allocator |
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37 // Usage: #include <cyg/kernel/memfixed.hxx> |
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38 // |
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39 // |
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40 //####DESCRIPTIONEND#### |
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41 // |
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42 //========================================================================== |
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43 |
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44 #include <pkgconf/kernel.h> |
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45 |
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46 #include <cyg/kernel/ktypes.h> // base kernel types |
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47 #include <cyg/infra/cyg_trac.h> // tracing macros |
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48 #include <cyg/infra/cyg_ass.h> // assertion macros |
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49 #include <cyg/kernel/instrmnt.h> // instrumentation |
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50 |
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51 #include <cyg/kernel/memfixed.hxx> |
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52 |
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53 // implementation that we want to make concrete |
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54 #ifdef CYGIMP_MEM_USE_MEMPOOLT_PLAIN |
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55 #include <cyg/kernel/mempoolt.inl> // kernel safe mempool template |
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56 #else |
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57 // tell it to optimize for the fixed block one-to-one case |
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58 #define CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC |
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59 #include <cyg/kernel/mempolt2.inl> // kernel safe mempool template |
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60 #endif |
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61 |
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62 #include <cyg/kernel/mfiximpl.inl> // implementation of a fixed mem pool |
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63 |
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64 // ------------------------------------------------------------------------- |
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65 // debugging/assert function |
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66 |
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67 #ifdef CYGDBG_USE_ASSERTS |
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68 cyg_bool |
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69 Cyg_Mempool_Fixed::check_this(cyg_assert_class_zeal zeal) |
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70 { |
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71 CYG_REPORT_FUNCTION(); |
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72 // check that we have a non-NULL pointer first |
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73 if( this == NULL ) return false; |
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74 return mypool.check_this( zeal ); |
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75 } |
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76 #endif |
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77 |
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78 // ------------------------------------------------------------------------- |
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79 // Constructor: gives the base and size of the arena in which memory is |
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80 // to be carved out, note that management structures are taken from the |
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81 // same arena. Alloc_unit is the blocksize allocated. |
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82 Cyg_Mempool_Fixed::Cyg_Mempool_Fixed( |
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83 cyg_uint8 *base, |
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84 cyg_int32 size, |
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85 CYG_ADDRWORD alloc_unit ) |
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86 : mypool( base, size, alloc_unit ) |
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87 { |
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88 } |
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89 |
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90 // Destructor |
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91 Cyg_Mempool_Fixed::~Cyg_Mempool_Fixed() |
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92 { |
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93 } |
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94 |
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95 // ------------------------------------------------------------------------- |
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96 // get some memory; wait if none available |
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97 cyg_uint8 * |
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98 Cyg_Mempool_Fixed::alloc() |
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99 { |
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100 return mypool.alloc( 0 ); |
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101 } |
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102 |
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103 #ifdef CYGFUN_KERNEL_THREADS_TIMER |
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104 // get some memory with a timeout |
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105 cyg_uint8 * |
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106 Cyg_Mempool_Fixed::alloc(cyg_tick_count delay_timeout ) |
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107 { |
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108 return mypool.alloc( 0, delay_timeout ); |
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109 } |
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110 #endif |
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111 |
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112 // get some memory, return NULL if none available |
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113 cyg_uint8 * |
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114 Cyg_Mempool_Fixed::try_alloc() |
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115 { |
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116 return mypool.try_alloc( 0 ); |
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117 } |
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118 |
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119 // free the memory back to the pool |
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120 cyg_bool |
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121 Cyg_Mempool_Fixed::free( cyg_uint8 *p ) |
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122 { |
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123 return mypool.free( p, 0 ); |
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124 } |
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125 |
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126 // is anyone waiting for memory? |
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127 cyg_bool |
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128 Cyg_Mempool_Fixed::waiting() |
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129 { |
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130 return mypool.waiting(); |
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131 } |
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132 |
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133 // read the fixed allocation size |
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134 cyg_int32 |
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135 Cyg_Mempool_Fixed::get_blocksize() |
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136 { |
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137 return mypool.get_blocksize(); |
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138 } |
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139 |
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140 // these two are obvious and generic |
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141 cyg_int32 |
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142 Cyg_Mempool_Fixed::get_totalmem() { |
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143 return mypool.get_totalmem(); |
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144 } |
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145 cyg_int32 |
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146 Cyg_Mempool_Fixed::get_freemem() { |
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147 return mypool.get_freemem(); |
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148 } |
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149 |
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150 // get information about the construction parameters for external |
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151 // freeing after the destruction of the holding object |
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152 void |
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153 Cyg_Mempool_Fixed::get_arena( |
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154 cyg_uint8 * &base, cyg_int32 &size, CYG_ADDRWORD &alloc ) |
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155 { |
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156 mypool.get_arena( base, size, alloc ); |
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157 } |
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158 |
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159 // Return the size of the memory allocation (previously returned |
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160 // by alloc() or try_alloc() ) at ptr. Returns -1 if not found |
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161 cyg_int32 |
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162 Cyg_Mempool_Fixed::get_allocation_size( cyg_uint8 *ptr ) |
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163 { |
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164 // can only be one size for the fixed block allocator |
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165 return mypool.get_blocksize(); |
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166 } |
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167 // ------------------------------------------------------------------------- |
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168 |
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169 // End of memfixed.cxx |
