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annotate packages/services/memalloc/common/current/include/mempolt2.inl @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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1 #ifndef CYGONCE_MEMALLOC_MEMPOLT2_INL
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2 #define CYGONCE_MEMALLOC_MEMPOLT2_INL
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3
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4 //==========================================================================
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5 //
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6 // mempolt2.inl
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7 //
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8 // Mempolt2 (Memory pool template) 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: jlarmour
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39 // Date: 2000-06-12
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40 // Purpose: Define Mempolt2 class interface
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41 // Description: The class defined here provides the APIs for thread-safe,
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42 // kernel-savvy memory managers; make a class with the
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43 // underlying allocator as the template parameter.
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44 // Usage: #include <cyg/memalloc/mempolt2.hxx>
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45 //
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46 //
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47 //####DESCRIPTIONEND####
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48 //
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49 //==========================================================================
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50
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51 #include <cyg/infra/cyg_ass.h> // assertion support
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52 #include <cyg/infra/cyg_trac.h> // tracing support
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53 #include <cyg/kernel/thread.inl> // implementation eg. Cyg_Thread::self();
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54 #include <cyg/kernel/sched.inl> // implementation eg. Cyg_Scheduler::lock();
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55
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56 // -------------------------------------------------------------------------
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57 // Constructor; we _require_ these arguments and just pass them through to
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58 // the implementation memory pool in use.
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59 template <class T>
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60 Cyg_Mempolt2<T>::Cyg_Mempolt2(
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61 cyg_uint8 *base,
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62 cyg_int32 size,
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63 CYG_ADDRWORD arg_thru) // Constructor
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64 : pool( base, size, arg_thru )
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65 {
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66 }
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67
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68
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69 template <class T>
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70 Cyg_Mempolt2<T>::~Cyg_Mempolt2() // destructor
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71 {
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72 // Prevent preemption
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73 Cyg_Scheduler::lock();
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74
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75 while ( ! queue.empty() ) {
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76 Cyg_Thread *thread = queue.dequeue();
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77 thread->set_wake_reason( Cyg_Thread::DESTRUCT );
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78 thread->wake();
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79 }
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80
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81 // Unlock the scheduler and maybe switch threads
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82 Cyg_Scheduler::unlock();
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83 }
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84
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85 // -------------------------------------------------------------------------
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86 // get some memory; wait if none available
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87 template <class T>
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88 inline cyg_uint8 *
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89 Cyg_Mempolt2<T>::alloc( cyg_int32 size )
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90 {
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91 CYG_REPORT_FUNCTION();
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92
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93 // Prevent preemption
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94 Cyg_Scheduler::lock();
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95 CYG_ASSERTCLASS( this, "Bad this pointer");
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96
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97 cyg_uint8 *ret;
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98 ret = pool.try_alloc( size );
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99 if ( ret ) {
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100 Cyg_Scheduler::unlock();
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101 CYG_ASSERTCLASS( this, "Bad this pointer");
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102 CYG_REPORT_RETVAL( ret );
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103 return ret;
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104 }
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105
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106 Cyg_Thread *self = Cyg_Thread::self();
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107
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108 Mempolt2WaitInfo waitinfo( size );
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109
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110 self->set_wait_info( (CYG_ADDRWORD)&waitinfo );
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111 self->set_sleep_reason( Cyg_Thread::WAIT );
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112 self->sleep();
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113 queue.enqueue( self );
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114
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115 CYG_ASSERT( 1 == Cyg_Scheduler::get_sched_lock(),
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116 "Called with non-zero scheduler lock");
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117
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118 // Unlock scheduler and allow other threads to run
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119 Cyg_Scheduler::unlock();
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120
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121 cyg_bool result = true; // just used as a flag here
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122 switch( self->get_wake_reason() )
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123 {
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124 case Cyg_Thread::DESTRUCT:
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125 case Cyg_Thread::BREAK:
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126 result = false;
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127 break;
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128
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129 case Cyg_Thread::EXIT:
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130 self->exit();
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131 break;
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132
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133 default:
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134 break;
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135 }
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136
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137 if ( ! result )
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138 ret = NULL;
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139 else
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140 ret = waitinfo.addr;
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141
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142 CYG_ASSERT( (!result) || (NULL != ret), "Good result but no alloc!" );
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143 CYG_ASSERTCLASS( this, "Bad this pointer");
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144 CYG_REPORT_RETVAL( ret );
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145 return ret;
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146 }
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147
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148 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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149 // -------------------------------------------------------------------------
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150 // get some memory with a timeout
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151 template <class T>
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152 inline cyg_uint8 *
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153 Cyg_Mempolt2<T>::alloc( cyg_int32 size, cyg_tick_count abs_timeout )
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154 {
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155 CYG_REPORT_FUNCTION();
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156
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157 // Prevent preemption
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158 Cyg_Scheduler::lock();
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159 CYG_ASSERTCLASS( this, "Bad this pointer");
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160
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161 cyg_uint8 *ret;
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162 ret = pool.try_alloc( size );
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163 if ( ret ) {
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164 Cyg_Scheduler::unlock();
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165 CYG_ASSERTCLASS( this, "Bad this pointer");
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166 CYG_REPORT_RETVAL( ret );
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167 return ret;
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168 }
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169
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170 Cyg_Thread *self = Cyg_Thread::self();
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171
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172 Mempolt2WaitInfo waitinfo( size );
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173
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174 self->set_timer( abs_timeout, Cyg_Thread::TIMEOUT );
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175
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176 // If the timeout is in the past, the wake reason will have been set to
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177 // something other than NONE already. If so, skip the wait and go
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178 // straight to unlock.
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179
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180 if( Cyg_Thread::NONE == self->get_wake_reason() ) {
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181 self->set_wait_info( (CYG_ADDRWORD)&waitinfo );
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182 self->sleep();
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183 queue.enqueue( self );
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184 }
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185
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186 CYG_ASSERT( 1 == Cyg_Scheduler::get_sched_lock(),
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187 "Called with non-zero scheduler lock");
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188
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189 // Unlock scheduler and allow other threads to run
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190 Cyg_Scheduler::unlock();
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191
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192 // clear the timer; if it actually fired, no worries.
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193 self->clear_timer();
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194
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195 cyg_bool result = true; // just used as a flag here
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196 switch( self->get_wake_reason() )
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197 {
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198 case Cyg_Thread::TIMEOUT:
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199 result = false;
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200 break;
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201
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202 case Cyg_Thread::DESTRUCT:
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203 case Cyg_Thread::BREAK:
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204 result = false;
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205 break;
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206
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207 case Cyg_Thread::EXIT:
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208 self->exit();
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209 break;
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210
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211 default:
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212 break;
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213 }
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214
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215 if ( ! result )
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216 ret = NULL;
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217 else
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218 ret = waitinfo.addr;
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219
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220 CYG_ASSERT( (!result) || (NULL != ret), "Good result but no alloc!" );
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221 CYG_ASSERTCLASS( this, "Bad this pointer");
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222 CYG_REPORT_RETVAL( ret );
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223 return ret;
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224 }
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225 #endif
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226
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227 // -------------------------------------------------------------------------
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228 // get some memory, return NULL if none available
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229 template <class T>
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230 inline cyg_uint8 *
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231 Cyg_Mempolt2<T>::try_alloc( cyg_int32 size )
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232 {
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233 CYG_REPORT_FUNCTION();
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234
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235 // Prevent preemption
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236 Cyg_Scheduler::lock();
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237 CYG_ASSERTCLASS( this, "Bad this pointer");
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238
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239 cyg_uint8 *ret = pool.try_alloc( size );
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240
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241 CYG_ASSERTCLASS( this, "Bad this pointer");
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242
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243 // Unlock the scheduler and maybe switch threads
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244 Cyg_Scheduler::unlock();
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245 return ret;
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246 }
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247
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248
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249 // -------------------------------------------------------------------------
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250 // resize existing allocation, if oldsize is non-NULL, previous
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251 // allocation size is placed into it. If previous size not available,
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252 // it is set to 0. NB previous allocation size may have been rounded up.
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253 // Occasionally the allocation can be adjusted *backwards* as well as,
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254 // or instead of forwards, therefore the address of the resized
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255 // allocation is returned, or NULL if no resizing was possible.
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256 // Note that this differs from ::realloc() in that no attempt is
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257 // made to call malloc() if resizing is not possible - that is left
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258 // to higher layers. The data is copied from old to new though.
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259 // The effects of alloc_ptr==NULL or newsize==0 are undefined
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260 template <class T>
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261 cyg_uint8 *
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262 Cyg_Mempolt2<T>::resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
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263 cyg_int32 *oldsize )
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264 {
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265 CYG_REPORT_FUNCTION();
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266
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267 // Prevent preemption
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268 Cyg_Scheduler::lock();
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269 CYG_ASSERTCLASS( this, "Bad this pointer");
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270
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271 cyg_uint8 *ret = pool.resize_alloc( alloc_ptr, newsize, oldsize );
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272
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273 CYG_ASSERTCLASS( this, "Bad this pointer");
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274
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275 // Unlock the scheduler and maybe switch threads
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276 Cyg_Scheduler::unlock();
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277 return ret;
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278 }
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279
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280
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281 // -------------------------------------------------------------------------
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282 // free the memory back to the pool
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283 template <class T>
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284 cyg_bool
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285 Cyg_Mempolt2<T>::free( cyg_uint8 *p, cyg_int32 size )
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286 {
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287 CYG_REPORT_FUNCTION();
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288 // Prevent preemption
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289 Cyg_Scheduler::lock();
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290 CYG_ASSERTCLASS( this, "Bad this pointer");
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291
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292 cyg_int32 ret = pool.free( p, size );
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293
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294 // anyone waiting?
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295 if ( !(queue.empty()) ) {
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296 Mempolt2WaitInfo *p;
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297 Cyg_Thread *thread;
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298
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299 #ifdef CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC
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300 thread = queue.dequeue();
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301 p = (Mempolt2WaitInfo *)(thread->get_wait_info());
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302 CYG_ASSERT( NULL == p->addr, "Thread already awoken?" );
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303
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304 cyg_uint8 *mem;
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305 mem = pool.try_alloc( p->size );
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306 CYG_ASSERT( NULL != mem, "That should have succeeded" );
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307 thread->set_wake_reason( Cyg_Thread::DONE );
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308 thread->wake();
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309 // return the successful value to it
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310 p->addr = mem;
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311 #else
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312 Cyg_ThreadQueue holding;
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313 do {
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314 thread = queue.dequeue();
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315 p = (Mempolt2WaitInfo *)(thread->get_wait_info());
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316 CYG_ASSERT( NULL == p->addr, "Thread already awoken?" );
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317
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318 cyg_uint8 *mem;
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319 if ( NULL != (mem = pool.try_alloc( p->size )) ) {
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320 // success! awaken the thread
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321 thread->set_wake_reason( Cyg_Thread::DONE );
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322 thread->wake();
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323 // return the successful value to it
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324 p->addr = mem;
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325 }
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326 else {
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327 // preserve the entry on the holding queue
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328 holding.enqueue( thread );
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329 }
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330 } while ( !(queue.empty()) );
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331
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332 // Now re-queue the unaffected threads back into the pool queue
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333 // (no pun intended)
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334 while ( !(holding.empty()) ) {
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335 queue.enqueue( holding.dequeue() );
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336 }
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337 #endif // CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC
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338 }
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339 // Unlock the scheduler and maybe switch threads
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340 Cyg_Scheduler::unlock();
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341 CYG_REPORT_RETVAL( ret );
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342 return ret;
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343 }
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344
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345 // -------------------------------------------------------------------------
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346 // Get memory pool status
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347 // Needs atomicity protection (maybe)
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348 template <class T>
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349 inline void
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350 Cyg_Mempolt2<T>::get_status( cyg_mempool_status_flag_t flags,
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351 Cyg_Mempool_Status &status )
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352 {
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353 // Prevent preemption
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354 Cyg_Scheduler::lock();
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355 CYG_ASSERTCLASS( this, "Bad this pointer");
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356
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357 if (0 != (flags & CYG_MEMPOOL_STAT_WAITING)) {
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358 status.waiting = (0 == queue.empty());
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359 }
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360 pool.get_status(flags, status);
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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
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366 // -------------------------------------------------------------------------
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367 // debugging/assert function
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368
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369 #ifdef CYGDBG_USE_ASSERTS
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370
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371 template <class T>
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372 inline cyg_bool
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373 Cyg_Mempolt2<T>::check_this(cyg_assert_class_zeal zeal) const
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374 {
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375 CYG_REPORT_FUNCTION();
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376
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377 if ( Cyg_Thread::DESTRUCT == Cyg_Thread::self()->get_wake_reason() )
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378 // then the whole thing is invalid, and we know it.
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379 // so return OK, since this check should NOT make an error.
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380 return true;
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381
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382 // check that we have a non-NULL pointer first
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383 if( this == NULL ) return false;
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384
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385 return true;
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386 }
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387 #endif
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388
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389 // -------------------------------------------------------------------------
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390 #endif // ifndef CYGONCE_MEMALLOC_MEMPOLT2_INL
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391 // EOF mempolt2.inl