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annotate packages/services/memalloc/common/current/include/dlmalloc.hxx @ 2863:7d8c61e6225c default tip

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* Added execute permissions to files missed in conversion from CVS
author alexs
date Thu, 26 Mar 2009 20:39:18 +0000
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1 #ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX
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2 #define CYGONCE_MEMALLOC_DLMALLOC_HXX
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3
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4 //==========================================================================
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5 //
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6 // dlmalloc.hxx
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7 //
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8 // Interface to the port of Doug Lea's malloc implementation
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9 //
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10 //==========================================================================
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11 // ####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later
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19 // version.
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20 //
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21 // eCos is distributed in the hope that it will be useful, but WITHOUT
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22 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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23 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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24 // for more details.
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25 //
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26 // You should have received a copy of the GNU General Public License
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27 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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28 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
208
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29 //
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30 // As a special exception, if other files instantiate templates or use
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31 // macros or inline functions from this file, or you compile this file
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32 // and link it with other works to produce a work based on this file,
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33 // this file does not by itself cause the resulting work to be covered by
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34 // the GNU General Public License. However the source code for this file
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35 // must still be made available in accordance with section (3) of the GNU
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36 // General Public License v2.
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37 //
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38 // This exception does not invalidate any other reasons why a work based
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39 // on this file might be covered by the GNU General Public License.
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40 // -------------------------------------------
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41 // ####ECOSGPLCOPYRIGHTEND####
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42 //==========================================================================
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43 //#####DESCRIPTIONBEGIN####
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44 //
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45 // Author(s): jlarmour
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46 // Contributors:
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47 // Date: 2000-06-18
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48 // Purpose: Define standard interface to Doug Lea's malloc implementation
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49 // Description: Doug Lea's malloc has been ported to eCos. This file provides
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50 // the interface between the implementation and the standard
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51 // memory allocator interface required by eCos
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52 // Usage: #include <cyg/memalloc/dlmalloc.hxx>
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53 //
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54 //
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55 //####DESCRIPTIONEND####
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56 //
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57 //==========================================================================
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58
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59 // CONFIGURATION
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60
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61 #include <pkgconf/memalloc.h>
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62
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63 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
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64 # include <pkgconf/system.h>
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65 # ifdef CYGPKG_KERNEL
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66 # include <pkgconf/kernel.h>
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67 # endif
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68 #endif
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69
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70 // when used as an implementation for malloc, we need the following
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71 // to let the system know the name of the class
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72 #define CYGCLS_MEMALLOC_MALLOC_IMPL Cyg_Mempool_dlmalloc
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73
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74 // if the implementation is all that's required, don't output anything else
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75 #ifndef __MALLOC_IMPL_WANTED
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76
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77 // INCLUDES
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78
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79 #include <stddef.h> // size_t, ptrdiff_t
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80 #include <cyg/infra/cyg_type.h> // types
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81 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
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82 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
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83 #endif
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84 #include <cyg/memalloc/dlmallocimpl.hxx> // dlmalloc implementation
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85 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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86 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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87 # include <cyg/kernel/ktypes.h> // cyg_tick_count
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88 #endif
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89
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90
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91 // TYPE DEFINITIONS
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92
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93
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94 class Cyg_Mempool_dlmalloc
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95 {
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96 protected:
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97 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
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98 Cyg_Mempolt2<Cyg_Mempool_dlmalloc_Implementation> mypool;
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99 #else
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100 Cyg_Mempool_dlmalloc_Implementation mypool;
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101 #endif
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102
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103
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104 public:
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105 // Constructor: gives the base and size of the arena in which memory is
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106 // to be carved out, note that management structures are taken from the
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107 // same arena.
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108 Cyg_Mempool_dlmalloc( cyg_uint8 *base, cyg_int32 size,
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109 CYG_ADDRWORD argthru=0 )
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110 : mypool( base, size, argthru ) {}
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111
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112 // Destructor
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113 ~Cyg_Mempool_dlmalloc() {}
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114
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115 // get some memory; wait if none available
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116 // if we aren't configured to be thread-aware this is irrelevant
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117 #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE
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118 cyg_uint8 *
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119 alloc( cyg_int32 size ) { return mypool.alloc( size ); }
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120
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121 # ifdef CYGFUN_KERNEL_THREADS_TIMER
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122 // get some memory with a timeout
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123 cyg_uint8 *
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124 alloc( cyg_int32 size, cyg_tick_count delay_timeout ) {
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125 return mypool.alloc( size, delay_timeout );
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126 }
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127 # endif
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128 #endif
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129
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130 // get some memory, return NULL if none available
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131 cyg_uint8 *
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132 try_alloc( cyg_int32 size ) { return mypool.try_alloc( size ); }
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133
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134
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135 // resize existing allocation, if oldsize is non-NULL, previous
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136 // allocation size is placed into it. If previous size not available,
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137 // it is set to 0. NB previous allocation size may have been rounded up.
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138 // Occasionally the allocation can be adjusted *backwards* as well as,
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139 // or instead of forwards, therefore the address of the resized
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140 // allocation is returned, or NULL if no resizing was possible.
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141 // Note that this differs from ::realloc() in that no attempt is
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142 // made to call malloc() if resizing is not possible - that is left
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143 // to higher layers. The data is copied from old to new though.
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144 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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145 cyg_uint8 *
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146 resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
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147 cyg_int32 *oldsize ) {
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148 return mypool.resize_alloc( alloc_ptr, newsize, oldsize);
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149 }
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150
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151 // free the memory back to the pool
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152 // returns true on success
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153 cyg_bool
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154 free( cyg_uint8 *ptr, cyg_int32 size=0 ) { return mypool.free(ptr, size); }
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155
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156 // Get memory pool status
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157 // flags is a bitmask of requested fields to fill in. The flags are
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158 // defined in common.hxx
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159 void
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160 get_status( cyg_mempool_status_flag_t flags, Cyg_Mempool_Status &status ) {
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161 // set to 0 - if there's anything really waiting, it will be set to
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162 // 1 later
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163 status.waiting = 0;
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164 mypool.get_status( flags, status );
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165 }
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166 };
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167
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168 #endif // ifndef __MALLOC_IMPL_WANTED
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169
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170 #endif // ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX
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171 // EOF dlmalloc.hxx