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1 #ifndef CYGONCE_KERNEL_MVARIMPL_HXX |
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2 #define CYGONCE_KERNEL_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 //####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 Cygnus eCos Public License |
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15 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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25 // September 30, 1998. |
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26 // |
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27 // The Initial Developer of the Original Code is Cygnus. Portions created |
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28 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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29 // ------------------------------------------- |
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30 // |
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31 //####COPYRIGHTEND#### |
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32 //========================================================================== |
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33 //#####DESCRIPTIONBEGIN#### |
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34 // |
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35 // Author(s): dsm |
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36 // Contributors: dsm |
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37 // Date: 1998-05-21 |
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38 // Purpose: Define Mvarimpl class interface |
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39 // Description: Inline class for constructing a variable block allocator |
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40 // Usage: #include <cyg/kernel/mvarimpl.hxx> |
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41 // |
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42 // |
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43 //####DESCRIPTIONEND#### |
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44 // |
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45 //========================================================================== |
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46 |
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47 #include <cyg/kernel/ktypes.h> |
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48 #include <cyg/kernel/thread.hxx> |
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49 |
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50 class Cyg_Mempool_Variable_Implementation { |
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51 private: |
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52 // these constructors are explicitly disallowed |
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53 Cyg_Mempool_Variable_Implementation() {}; |
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54 // Cyg_Mempool_Variable_Implementation( Cyg_Mempool_Variable_Implementation &ref ) |
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55 // {}; |
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56 Cyg_Mempool_Variable_Implementation & |
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57 operator=( Cyg_Mempool_Variable_Implementation &ref ) |
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58 { return ref; }; |
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59 |
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60 private: |
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61 struct memdq { |
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62 struct memdq *prev, *next; |
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63 cyg_int32 size; |
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64 }; |
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65 |
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66 struct memdq head; |
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67 cyg_uint8 *obase; |
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68 cyg_int32 osize; |
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69 cyg_int32 oalign; |
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70 cyg_uint8 *bottom; |
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71 cyg_uint8 *top; |
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72 cyg_int32 alignment; |
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73 cyg_int32 freemem; |
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74 |
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75 // round up size passed to alloc/free to a size that will be used |
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76 // for allocation |
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77 cyg_int32 |
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78 roundup(cyg_int32 size); |
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79 |
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80 public: |
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81 // THIS is the public API of memory pools generally that can have the |
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82 // kernel oriented thread-safe package layer atop. |
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83 |
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84 // Constructor: gives the base and size of the arena in which memory is |
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85 // to be carved out. |
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86 Cyg_Mempool_Variable_Implementation( |
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87 cyg_uint8 * /* base */, |
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88 cyg_int32 /* size */, |
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89 CYG_ADDRWORD /* alignment */); |
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90 |
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91 // Destructor |
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92 ~Cyg_Mempool_Variable_Implementation(); |
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93 |
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94 // get size bytes of memory |
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95 inline cyg_uint8 * |
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96 alloc( cyg_int32 /* size */ ); |
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97 |
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98 // free size bytes of memory back to the pool |
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99 inline cyg_bool |
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100 free( cyg_uint8 * /* ptr */, |
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101 cyg_int32 /* size */ ); |
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102 |
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103 // returns -1 as not variable size |
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104 inline cyg_int32 |
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105 get_blocksize( void ) { return -1; } |
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106 |
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107 // these two are obvious and generic |
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108 inline cyg_int32 |
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109 get_totalmem( void ) { return top-bottom; } |
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110 |
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111 inline cyg_int32 |
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112 get_freemem( void ) { return freemem; } |
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113 |
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114 // get information about the construction parameters for external |
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115 // freeing after the destruction of the holding object |
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116 inline void |
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117 get_arena( cyg_uint8 * & /* base */, |
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118 cyg_int32 & /* size */, |
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119 CYG_ADDRWORD & /* maxfree */ ); |
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120 |
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121 // Return the size of the memory allocation (previously returned |
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122 // by alloc() or try_alloc() ) at ptr. Returns -1 if not found |
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123 inline cyg_int32 |
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124 get_allocation_size( cyg_uint8 * /* ptr */ ); |
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125 |
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126 }; |
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127 |
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128 // ------------------------------------------------------------------------- |
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129 #endif // ifndef CYGONCE_KERNEL_MVARIMPL_HXX |
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130 // EOF mvarimpl.hxx |
