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annotate packages/services/memalloc/common/current/include/mempoolt.inl @ 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 #ifndef CYGONCE_KERNEL_MEMPOOLT_INL
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2 #define CYGONCE_KERNEL_MEMPOOLT_INL
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3
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4 //==========================================================================
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5 //
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6 // mempoolt.inl
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7 //
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8 // Mempoolt (Memory pool template) class declarations
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9 //
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10 //==========================================================================
208
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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 Red Hat, 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 version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
115
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): hmt
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47 // Contributors: hmt
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48 // Date: 1998-02-10
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49 // Purpose: Define Mempoolt class interface
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50
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51 // Description: The class defined here provides the APIs for thread-safe,
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52 // kernel-savvy memory managers; make a class with the
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53 // underlying allocator as the template parameter.
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54 // Usage: #include <cyg/kernel/mempoolt.hxx>
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55 //
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56 //
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57 //####DESCRIPTIONEND####
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58 //
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59 //==========================================================================
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60
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61 #include <cyg/kernel/thread.inl> // implementation eg. Cyg_Thread::self();
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62 #include <cyg/kernel/sched.inl> // implementation eg. Cyg_Scheduler::lock();
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63
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64 // -------------------------------------------------------------------------
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65 // Constructor; we _require_ these arguments and just pass them through to
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66 // the implementation memory pool in use.
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67 template <class T>
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68 Cyg_Mempoolt<T>::Cyg_Mempoolt(
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69 cyg_uint8 *base,
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70 cyg_int32 size,
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71 CYG_ADDRWORD arg_thru) // Constructor
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72 : pool( base, size, arg_thru )
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73 {
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74 }
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75
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76
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77 template <class T>
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78 Cyg_Mempoolt<T>::~Cyg_Mempoolt() // destructor
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79 {
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80 // Prevent preemption
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81 Cyg_Scheduler::lock();
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82
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83 while ( ! queue.empty() ) {
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84 Cyg_Thread *thread = queue.dequeue();
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85 thread->set_wake_reason( Cyg_Thread::DESTRUCT );
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86 thread->wake();
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87 }
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88
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89 // Unlock the scheduler and maybe switch threads
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90 Cyg_Scheduler::unlock();
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91 }
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92
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93 // -------------------------------------------------------------------------
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94 // get some memory; wait if none available
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95 template <class T>
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96 inline cyg_uint8 *
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97 Cyg_Mempoolt<T>::alloc( cyg_int32 size )
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98 {
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99 CYG_REPORT_FUNCTION();
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100
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101 Cyg_Thread *self = Cyg_Thread::self();
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102
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103 // Prevent preemption
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104 Cyg_Scheduler::lock();
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105 CYG_ASSERTCLASS( this, "Bad this pointer");
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106
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107 // Loop while we got no memory, sleeping each time around the
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108 // loop. This copes with the possibility of a higher priority thread
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109 // grabbing the freed storage between the wakeup in free() and this
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110 // thread actually starting.
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111 cyg_uint8 *ret;
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112 cyg_bool result = true;
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113 while( result && (NULL == (ret = pool.alloc( size ))) ) {
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114 self->set_sleep_reason( Cyg_Thread::WAIT );
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115 self->sleep();
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116 queue.enqueue( self );
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117
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118 CYG_ASSERT( 1 == Cyg_Scheduler::get_sched_lock(),
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119 "Called with non-zero scheduler lock");
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120
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121 // Unlock scheduler and allow other threads to run
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122 Cyg_Scheduler::unlock();
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123 Cyg_Scheduler::lock();
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124
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125 CYG_ASSERTCLASS( this, "Bad this pointer");
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126
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127 switch( self->get_wake_reason() )
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128 {
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129 case Cyg_Thread::DESTRUCT:
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130 case Cyg_Thread::BREAK:
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131 result = false;
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132 break;
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133
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134 case Cyg_Thread::EXIT:
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135 self->exit();
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136 break;
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137
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138 default:
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139 break;
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140 }
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141 }
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142 CYG_ASSERTCLASS( this, "Bad this pointer");
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143
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144 if ( ! result )
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145 ret = NULL;
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146
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147 // Unlock the scheduler and maybe switch threads
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148 Cyg_Scheduler::unlock();
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149 CYG_REPORT_RETVAL( ret );
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150 return ret;
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151 }
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152
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153 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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154 // -------------------------------------------------------------------------
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155 // get some memory with a timeout
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156 template <class T>
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157 inline cyg_uint8 *
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158 Cyg_Mempoolt<T>::alloc( cyg_int32 size, cyg_tick_count abs_timeout )
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159 {
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160 CYG_REPORT_FUNCTION();
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161
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162 Cyg_Thread *self = Cyg_Thread::self();
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163
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164 // Prevent preemption
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165 Cyg_Scheduler::lock();
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166 CYG_ASSERTCLASS( this, "Bad this pointer");
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167
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168 // Loop while we got no memory, sleeping each time around the
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169 // loop. This copes with the possibility of a higher priority thread
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170 // grabbing the freed storage between the wakeup in free() and this
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171 // thread actually starting.
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172 cyg_uint8 *ret;
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173 cyg_bool result = true;
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174 // Set the timer _once_ outside the loop.
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175 self->set_timer( abs_timeout, Cyg_Thread::TIMEOUT );
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176
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177 // If the timeout is in the past, the wake reason will have been
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178 // set to something other than NONE already. Set the result false
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179 // to force an immediate return.
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180
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181 if( self->get_wake_reason() != Cyg_Thread::NONE )
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182 result = false;
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183
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184 while( result && (NULL == (ret = pool.alloc( size ))) ) {
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185 self->set_sleep_reason( Cyg_Thread::TIMEOUT );
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186 self->sleep();
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187 queue.enqueue( self );
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188
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189 CYG_ASSERT( 1 == Cyg_Scheduler::get_sched_lock(),
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190 "Called with non-zero scheduler lock");
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191
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192 // Unlock scheduler and allow other threads to run
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193 Cyg_Scheduler::unlock();
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194 Cyg_Scheduler::lock();
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195
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196 CYG_ASSERTCLASS( this, "Bad this pointer");
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197 switch( self->get_wake_reason() )
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198 {
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199 case Cyg_Thread::TIMEOUT:
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200 result = false;
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201 break;
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202
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203 case Cyg_Thread::DESTRUCT:
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204 case Cyg_Thread::BREAK:
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205 result = false;
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206 break;
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207
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208 case Cyg_Thread::EXIT:
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209 self->exit();
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210 break;
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211
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212 default:
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213 break;
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214 }
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215 }
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216
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217 CYG_ASSERTCLASS( this, "Bad this pointer");
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218
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219 if ( ! result )
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220 ret = NULL;
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221
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222 // clear the timer; if it actually fired, no worries.
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223 self->clear_timer();
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224
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225 // Unlock the scheduler and maybe switch threads
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226 Cyg_Scheduler::unlock();
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227 CYG_REPORT_RETVAL( ret );
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228 return ret;
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229 }
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230 #endif
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231
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232 // -------------------------------------------------------------------------
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233 // get some memory, return NULL if none available
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234 template <class T>
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235 inline cyg_uint8 *
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236 Cyg_Mempoolt<T>::try_alloc( cyg_int32 size )
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237 {
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238 CYG_REPORT_FUNCTION();
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239
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240 // Prevent preemption
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241 Cyg_Scheduler::lock();
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242 CYG_ASSERTCLASS( this, "Bad this pointer");
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243
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244 cyg_uint8 *ret = pool.alloc( size );
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245
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246 CYG_ASSERTCLASS( this, "Bad this pointer");
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247
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248 // Unlock the scheduler and maybe switch threads
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249 Cyg_Scheduler::unlock();
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250 CYG_REPORT_RETVAL( ret );
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251 return ret;
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252 }
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253
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254
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255 // -------------------------------------------------------------------------
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256 // free the memory back to the pool
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257 template <class T>
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258 cyg_bool
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259 Cyg_Mempoolt<T>::free( cyg_uint8 *p, cyg_int32 size )
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260 {
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261 // Prevent preemption
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262 Cyg_Scheduler::lock();
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263 CYG_ASSERTCLASS( this, "Bad this pointer");
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264
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265 cyg_int32 ret = pool.free( p, size );
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266
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267 CYG_ASSERTCLASS( this, "Bad this pointer");
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268
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269 while ( ret && !queue.empty() ) {
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270 // we succeeded and there are people waiting
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271 Cyg_Thread *thread = queue.dequeue();
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272
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273 CYG_ASSERTCLASS( thread, "Bad thread pointer");
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274
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275 // we wake them all up (ie. broadcast) to cope with variable block
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276 // allocators freeing a big block when lots of small allocs wait.
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277 thread->set_wake_reason( Cyg_Thread::DONE );
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278 thread->wake();
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279 // we cannot yield here; if a higher prio thread can't satisfy its
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280 // request it would re-queue and we would loop forever
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281 }
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282 // Unlock the scheduler and maybe switch threads
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283 Cyg_Scheduler::unlock();
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284 return ret;
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285 }
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286
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287 // -------------------------------------------------------------------------
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288 // if applicable: return -1 if not fixed size
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289 template <class T>
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290 inline cyg_int32
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291 Cyg_Mempoolt<T>::get_blocksize()
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292 {
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293 // there should not be any atomicity issues here
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294 return pool.get_blocksize();
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295 }
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296
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297 // -------------------------------------------------------------------------
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298 // these two are obvious and generic, but need atomicity protection (maybe)
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299 template <class T>
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300 inline cyg_int32
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301 Cyg_Mempoolt<T>::get_totalmem()
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302 {
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303 // Prevent preemption
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304 Cyg_Scheduler::lock();
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305 CYG_ASSERTCLASS( this, "Bad this pointer");
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306
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307 cyg_int32 ret = pool.get_totalmem();
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308
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309 // Unlock the scheduler and maybe switch threads
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310 Cyg_Scheduler::unlock();
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311 return ret;
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312 }
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313
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314 template <class T>
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315 inline cyg_int32
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316 Cyg_Mempoolt<T>::get_freemem()
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317 {
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318 // Prevent preemption
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319 Cyg_Scheduler::lock();
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320 CYG_ASSERTCLASS( this, "Bad this pointer");
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321
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322 cyg_int32 ret = pool.get_freemem();
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323
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324 // Unlock the scheduler and maybe switch threads
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325 Cyg_Scheduler::unlock();
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326 return ret;
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327 }
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328
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329 // -------------------------------------------------------------------------
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330 // get information about the construction parameters for external
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331 // freeing after the destruction of the holding object
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332 template <class T>
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333 inline void
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334 Cyg_Mempoolt<T>::get_arena(
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335 cyg_uint8 * &base, cyg_int32 &size, CYG_ADDRWORD &arg_thru )
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336 {
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337 // Prevent preemption
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338 Cyg_Scheduler::lock();
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339 CYG_ASSERTCLASS( this, "Bad this pointer");
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340
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341 pool.get_arena( base, size, arg_thru );
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342
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343 // Unlock the scheduler and maybe switch threads
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344 Cyg_Scheduler::unlock();
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345 }
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346
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347 // -------------------------------------------------------------------------
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348 // Return the size of the memory allocation (previously returned
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349 // by alloc() or try_alloc() ) at ptr. Returns -1 if not found
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350 template <class T>
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351 cyg_int32
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352 Cyg_Mempoolt<T>::get_allocation_size( cyg_uint8 *ptr )
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353 {
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354 cyg_int32 ret;
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355
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356 // Prevent preemption
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357 Cyg_Scheduler::lock();
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358 CYG_ASSERTCLASS( this, "Bad this pointer");
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359
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360 ret = pool.get_allocation_size( ptr );
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361
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362 // Unlock the scheduler and maybe switch threads
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363 Cyg_Scheduler::unlock();
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364
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365 return ret;
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366 }
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367
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368 // -------------------------------------------------------------------------
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369 // debugging/assert function
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370
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371 #ifdef CYGDBG_USE_ASSERTS
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372
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373 template <class T>
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374 inline cyg_bool
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375 Cyg_Mempoolt<T>::check_this(cyg_assert_class_zeal zeal) const
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376 {
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377 CYG_REPORT_FUNCTION();
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378
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379 if ( Cyg_Thread::DESTRUCT == Cyg_Thread::self()->get_wake_reason() )
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380 // then the whole thing is invalid, and we know it.
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381 // so return OK, since this check should NOT make an error.
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382 return true;
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383
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384 // check that we have a non-NULL pointer first
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385 if( this == NULL ) return false;
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386
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387 return true;
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388 }
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389 #endif
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390
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391 // -------------------------------------------------------------------------
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392 #endif // ifndef CYGONCE_KERNEL_MEMPOOLT_INL
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393 // EOF mempoolt.inl