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annotate packages/services/memalloc/common/current/src/memfixed.cxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 6ed91473a1cd
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // memfixed.cxx
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4 //
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5 // Memory pool with fixed block class declarations
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6 //
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7 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
115
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): hmt
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44 // Contributors: jlarmour
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45 // Date: 2000-06-16
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46 // Purpose: Define Memfixed class interface
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47 // Description: Inline class for constructing a fixed block allocator
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48 // Usage: #include <cyg/memalloc/memfixed.hxx>
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49 //
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 // CONFIGURATION
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56
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57 #include <pkgconf/memalloc.h>
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58 #include <pkgconf/system.h>
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59 #ifdef CYGPKG_KERNEL
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60 # include <pkgconf/kernel.h>
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61 #endif
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62
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63
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64 // INCLUDES
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65
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66 #include <cyg/infra/cyg_type.h> // types
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67 #include <cyg/infra/cyg_ass.h> // assertion macros
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68 #include <cyg/infra/cyg_trac.h> // tracing macros
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69
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70 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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71 # include <cyg/kernel/ktypes.h> // cyg_tick_count
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72 #endif
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73
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74 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
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75 // tell it to optimize for the fixed block one-to-one case
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76 # define CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC
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77 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
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78 #endif
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79
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80 #include <cyg/memalloc/memfixed.hxx>
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81 #include <cyg/memalloc/mfiximpl.hxx> // implementation of a fixed mem pool
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82 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
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83
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84 // -------------------------------------------------------------------------
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85 // debugging/assert function
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86
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87 #ifdef CYGDBG_USE_ASSERTS
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88 cyg_bool
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89 Cyg_Mempool_Fixed::check_this(cyg_assert_class_zeal zeal) const
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90 {
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91 CYG_REPORT_FUNCTION();
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92 // check that we have a non-NULL pointer first
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93 if( this == NULL ) return false;
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94 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
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95 return mypool.check_this( zeal );
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96 #else
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97 return true;
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98 #endif
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99 }
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100 #endif
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101
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102 // -------------------------------------------------------------------------
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103 // Constructor: gives the base and size of the arena in which memory is
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104 // to be carved out, note that management structures are taken from the
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105 // same arena. Alloc_unit is the blocksize allocated.
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106 Cyg_Mempool_Fixed::Cyg_Mempool_Fixed(
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107 cyg_uint8 *base,
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108 cyg_int32 size,
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109 CYG_ADDRWORD alloc_unit )
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110 : mypool( base, size, alloc_unit )
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111 {
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112 }
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113
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114 // Destructor
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115 Cyg_Mempool_Fixed::~Cyg_Mempool_Fixed()
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116 {
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117 }
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118
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119 // -------------------------------------------------------------------------
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120 // get some memory; wait if none available
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121 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
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122 cyg_uint8 *
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123 Cyg_Mempool_Fixed::alloc()
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124 {
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125 return mypool.alloc( 0 );
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126 }
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127
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128 # ifdef CYGFUN_KERNEL_THREADS_TIMER
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129 // get some memory with a timeout
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130 cyg_uint8 *
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131 Cyg_Mempool_Fixed::alloc(cyg_tick_count delay_timeout )
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132 {
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133 return mypool.alloc( 0, delay_timeout );
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134 }
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135 # endif
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136 #endif
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137
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138 // get some memory, return NULL if none available
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139 cyg_uint8 *
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140 Cyg_Mempool_Fixed::try_alloc()
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141 {
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142 return mypool.try_alloc( 0 );
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143 }
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144
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145 // free the memory back to the pool
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146 cyg_bool
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147 Cyg_Mempool_Fixed::free( cyg_uint8 *p )
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148 {
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149 return mypool.free( p, 0 );
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150 }
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151
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152 // supposedly resize existing allocation. This is defined in the
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153 // fixed block allocator purely for API consistency. It will return
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154 // an error (false) for all values, except for the blocksize
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155 // returns true on success
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156 cyg_uint8 *
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157 Cyg_Mempool_Fixed::resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
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158 cyg_int32 *oldsize )
115
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159 {
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160 return mypool.resize_alloc( alloc_ptr, newsize, oldsize );
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161 }
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162
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163 // Get memory pool status
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164 void
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165 Cyg_Mempool_Fixed::get_status( cyg_mempool_status_flag_t flags,
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166 Cyg_Mempool_Status &status )
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167 {
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168 // set to 0 - if there's anything really waiting, it will be set to
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169 // 1 later
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170 status.waiting = 0;
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171
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172 return mypool.get_status( flags, status );
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173 }
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174
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175 // -------------------------------------------------------------------------
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176
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177 // End of memfixed.cxx