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annotate packages/kernel/current/include/mvarimpl.hxx @ 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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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 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
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38 // Contributors: dsm
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39 // Date: 1998-05-21
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40 // Purpose: Define Mvarimpl class interface
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41 // Description: Inline class for constructing a variable block allocator
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42 // Usage: #include <cyg/kernel/mvarimpl.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 #include <cyg/kernel/ktypes.h>
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50 #include <cyg/kernel/thread.hxx>
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51
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52 class Cyg_Mempool_Variable_Implementation {
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53 private:
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54 // these constructors are explicitly disallowed
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55 Cyg_Mempool_Variable_Implementation() {};
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56 // Cyg_Mempool_Variable_Implementation( Cyg_Mempool_Variable_Implementation &ref )
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57 // {};
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58 Cyg_Mempool_Variable_Implementation &
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59 operator=( Cyg_Mempool_Variable_Implementation &ref )
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60 { return ref; };
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61
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62 private:
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63 struct memdq {
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64 struct memdq *prev, *next;
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65 cyg_int32 size;
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66 };
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67
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68 struct memdq head;
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69 cyg_uint8 *obase;
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70 cyg_int32 osize;
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71 cyg_int32 oalign;
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72 cyg_uint8 *bottom;
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73 cyg_uint8 *top;
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74 cyg_int32 alignment;
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75 cyg_int32 freemem;
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76
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77 // round up size passed to alloc/free to a size that will be used
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78 // for allocation
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79 cyg_int32
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80 roundup(cyg_int32 size);
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81
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82 public:
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83 // THIS is the public API of memory pools generally that can have the
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84 // kernel oriented thread-safe package layer atop.
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85
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86 // Constructor: gives the base and size of the arena in which memory is
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87 // to be carved out.
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88 Cyg_Mempool_Variable_Implementation(
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89 cyg_uint8 * /* base */,
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90 cyg_int32 /* size */,
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91 CYG_ADDRWORD /* alignment */);
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92
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93 // Destructor
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94 ~Cyg_Mempool_Variable_Implementation();
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95
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96 // get size bytes of memory
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97 inline cyg_uint8 *
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98 alloc( cyg_int32 /* size */ );
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99
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100 // free size bytes of memory back to the pool
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101 inline cyg_bool
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102 free( cyg_uint8 * /* ptr */,
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103 cyg_int32 /* size */ );
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104
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105 // returns -1 as not variable size
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106 inline cyg_int32
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107 get_blocksize( void ) { return -1; }
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108
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109 // these two are obvious and generic
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110 inline cyg_int32
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111 get_totalmem( void ) { return top-bottom; }
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112
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113 inline cyg_int32
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114 get_freemem( void ) { return freemem; }
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115
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116 // get information about the construction parameters for external
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117 // freeing after the destruction of the holding object
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118 inline void
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119 get_arena( cyg_uint8 * & /* base */,
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120 cyg_int32 & /* size */,
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121 CYG_ADDRWORD & /* maxfree */ );
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122
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123 // Return the size of the memory allocation (previously returned
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124 // by alloc() or try_alloc() ) at ptr. Returns -1 if not found
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125 inline cyg_int32
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126 get_allocation_size( cyg_uint8 * /* ptr */ );
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127
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128 };
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129
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130 // -------------------------------------------------------------------------
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131 #endif // ifndef CYGONCE_KERNEL_MVARIMPL_HXX
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132 // EOF mvarimpl.hxx