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annotate packages/kernel/current/include/mfiximpl.hxx @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
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1 #ifndef CYGONCE_KERNEL_MFIXIMPL_HXX
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2 #define CYGONCE_KERNEL_MFIXIMPL_HXX
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3
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4 //==========================================================================
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5 //
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6 // mfiximpl.hxx
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7 //
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8 // Memory pool with fixed 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): hmt
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38 // Contributors: hmt
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39 // Date: 1998-03-23
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40 // Purpose: Define Mfiximpl class interface
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41 // Description: Inline class for constructing a fixed block allocator
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42 // Usage: #include <cyg/kernel/mfiximpl.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/infra/cyg_ass.h> // assertion macros
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51 #include <cyg/kernel/thread.hxx>
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52
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53 class Cyg_Mempool_Fixed_Implementation {
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54 private:
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55 // these constructors are explicitly disallowed
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56 Cyg_Mempool_Fixed_Implementation() {};
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57 // Cyg_Mempool_Fixed_Implementation( Cyg_Mempool_Fixed_Implementation &ref )
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58 // {};
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59 Cyg_Mempool_Fixed_Implementation &
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60 operator=( Cyg_Mempool_Fixed_Implementation &ref )
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61 { return ref; };
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62
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63 private:
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64 cyg_uint32 *bitmap;
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65 cyg_int32 maptop;
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66 cyg_uint8 *mempool;
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67 cyg_int32 numblocks;
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68 cyg_int32 freeblocks;
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69 cyg_int32 blocksize;
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70 cyg_int32 firstfree;
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71 cyg_uint8 *top;
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72
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73 public:
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74 // THIS is the public API of memory pools generally that can have the
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75 // kernel oriented thread-safe package layer atop.
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76 //
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77 // The kernel package is a template whose type parameter is one of
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78 // these. That is the reason there are superfluous parameters here and
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79 // more genereralization than might be expected in a fixed block
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80 // allocator.
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81
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82 // Constructor: gives the base and size of the arena in which memory is
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83 // to be carved out, note that management structures are taken from the
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84 // same arena. The alloc_unit may be any other param in general; it
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85 // comes through from the outer constructor unchanged.
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86 Cyg_Mempool_Fixed_Implementation(
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87 cyg_uint8 *base,
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88 cyg_int32 size,
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89 CYG_ADDRWORD alloc_unit );
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90
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91 // Destructor
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92 ~Cyg_Mempool_Fixed_Implementation();
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93
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94 // get some memory; size is ignored in a fixed block allocator
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95 inline cyg_uint8 *alloc( cyg_int32 size );
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96
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97 // free the memory back to the pool; size ignored here
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98 inline cyg_bool free( cyg_uint8 *p, cyg_int32 size );
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99
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100 // if applicable: return -1 if not fixed size
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101 inline cyg_int32 get_blocksize() { return blocksize; }
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102
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103 // these two are obvious and generic
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104 inline cyg_int32 get_totalmem() { return blocksize * numblocks; }
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105 inline cyg_int32 get_freemem() { return blocksize * freeblocks; }
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106
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107 // get information about the construction parameters for external
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108 // freeing after the destruction of the holding object
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109 inline void get_arena( cyg_uint8 * &base, cyg_int32 &size, CYG_ADDRWORD &alloc )
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110 {
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111 base = (cyg_uint8 *)bitmap;
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112 size = top - base;
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113 alloc = blocksize;
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114 }
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115
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116 };
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117
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118 // -------------------------------------------------------------------------
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119 #endif // ifndef CYGONCE_KERNEL_MFIXIMPL_HXX
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120 // EOF mfiximpl.hxx