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annotate packages/kernel/current/include/memvar.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_MEMVAR_HXX
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2 #define CYGONCE_KERNEL_MEMVAR_HXX
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3
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4 //==========================================================================
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5 //
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6 // memvar.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 Memvar 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/memvar.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> // kernel types
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50 #include <cyg/infra/cyg_ass.h> // assertion macros
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51
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52 #ifdef CYGIMP_MEM_USE_MEMPOOLT_PLAIN
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53 #include <cyg/kernel/mempoolt.hxx> // kernel safe mempool template
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54 #else
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55 #include <cyg/kernel/mempolt2.hxx> // kernel safe mempool template
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56 #endif
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57
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58 #include <cyg/kernel/mvarimpl.hxx> // implementation of a variable mem pool
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59
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60 class Cyg_Mempool_Variable {
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61 private:
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62 #ifdef CYGIMP_MEM_USE_MEMPOOLT_PLAIN
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63 Cyg_Mempoolt<Cyg_Mempool_Variable_Implementation> mypool;
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64 #else
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65 Cyg_Mempolt2<Cyg_Mempool_Variable_Implementation> mypool;
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66 #endif
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67
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68 public:
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69 // this API makes concrete a class which implements a thread-safe
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70 // kernel-savvy memory pool which manages variable size blocks.
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71
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72 CYGDBG_DEFINE_CHECK_THIS
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73
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74 // Constructor: gives the base and size of the arena in which memory is
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75 // to be carved out, note that management structures are taken from the
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76 // same arena. Alignment is the alignment of allocated blocks.
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77 Cyg_Mempool_Variable(
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78 cyg_uint8 * /* base */,
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79 cyg_int32 /* size */);
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80
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81 // Destructor
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82 ~Cyg_Mempool_Variable();
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83
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84 // get some memory; wait if none available
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85 cyg_uint8 *
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86 alloc(cyg_int32 /* size */);
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87
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88 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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89 // get some memory with a timeout
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90 cyg_uint8 *
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91 alloc(cyg_int32 /* size */, cyg_tick_count /* delay_timeout */ );
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92 #endif
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93
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94 // get some memory, return NULL if none available
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95 cyg_uint8 *
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96 try_alloc(cyg_int32 /* size */ );
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97
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98 // free the memory back to the pool
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99 cyg_bool
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100 free( cyg_uint8 * /* ptr */, cyg_int32 /* size */ );
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101
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102 // is anyone waiting for memory?
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103 cyg_bool
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104 waiting( void );
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105
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106 // read the fixed allocation size (-1 indicates variable)
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107 cyg_int32
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108 get_blocksize( void );
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109
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110 // these two are obvious and generic
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111 cyg_int32
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112 get_totalmem( void );
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113
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114 cyg_int32
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115 get_freemem( void );
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116
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117 // get information about the construction parameters for external
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118 // freeing after the destruction of the holding object
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119 // also finds largest free block
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120 void
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121 get_arena( cyg_uint8 * & /* base */, cyg_int32 & /* size */,
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122 CYG_ADDRWORD & /* maxfree */ );
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123
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124 // Return the size of the memory allocation (previously returned
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125 // by alloc() or try_alloc() ) at ptr. Returns -1 if not found
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126 cyg_int32
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127 get_allocation_size( cyg_uint8 * /* ptr */ );
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128 };
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129
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130 #endif // ifndef CYGONCE_KERNEL_MEMVAR_HXX
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131 // EOF memvar.hxx