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annotate packages/kernel/current/include/lottery.hxx @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children
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1 #ifndef CYGONCE_KERNEL_LOTTERY_HXX
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2 #define CYGONCE_KERNEL_LOTTERY_HXX
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3
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4 //==========================================================================
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5 //
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6 // lottery.hxx
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7 //
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8 // Lottery scheduler class declarations
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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 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####
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): nickg
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47 // Contributors: nickg
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48 // Date: 1997-09-10
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49 // Purpose: Define lottery scheduler implementation
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50 // Description: The classes defined here are used as base classes
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51 // by the common classes that define schedulers and thread
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52 // things. A lottery scheduler provides each thread with a
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53 // share of the processor based on the number of tickets that
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54 // it owns.
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55 // Usage: Included according to configuration by
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56 // <cyg/kernel/sched.hxx>
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57 //
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58 //####DESCRIPTIONEND####
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59 //
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60 //==========================================================================
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61
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62 #include <cyg/kernel/ktypes.h>
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63
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64 // -------------------------------------------------------------------------
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65 // Customize the scheduler
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66
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67 #define CYGIMP_THREAD_PRIORITY 1 // Threads have changable priorities
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68
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69 #define CYG_THREAD_MIN_PRIORITY 1
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70 #define CYG_THREAD_MAX_PRIORITY 0x7FFFFFFF
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71
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72 // set default scheduling info value for thread constructors.
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73 #define CYG_SCHED_DEFAULT_INFO CYG_THREAD_MAX_PRIORITY
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74
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75 #error Lottery Scheduler not yet complete, do not use!!!
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76
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77 // -------------------------------------------------------------------------
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78 // Thread queue implementation.
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79 // This class provides the (scheduler specific) implementation of the
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80 // thread queue class.
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81
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82 class Cyg_ThreadQueue_Implementation
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83 {
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84 friend class Cyg_Scheduler_Implementation;
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85 friend class Cyg_SchedThread_Implementation;
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86
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87 Cyg_Thread *queue;
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88
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89 protected:
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90
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91 // API used by Cyg_ThreadQueue
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92
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93 // Add thread to queue
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94 void enqueue(Cyg_Thread *thread);
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95
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96 // return first thread on queue
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97 Cyg_Thread *highpri();
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98
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99 // remove first thread on queue
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100 Cyg_Thread *dequeue();
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101
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102 // remove specified thread from queue
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103 void remove(Cyg_Thread *thread);
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104
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105 // test if queue is empty
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106 cyg_bool empty();
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107
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108 void rotate(); // Rotate the queue
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109 };
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110
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111 inline cyg_bool Cyg_ThreadQueue_Implementation::empty()
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112 {
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113 return queue == NULL;
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114 }
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115
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116 // -------------------------------------------------------------------------
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117 // This class contains the implementation details of the scheduler, and
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118 // provides a standard API for accessing it.
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119
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120 class Cyg_Scheduler_Implementation
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121 : public Cyg_Scheduler_Base
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122 {
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123 friend class Cyg_ThreadQueue_Implementation;
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124 friend class Cyg_SchedThread_Implementation;
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125
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126 // All runnable threads are kept on a single run queue
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127 // in MRU order.
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128 Cyg_ThreadQueue_Implementation run_queue;
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129
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130 cyg_uint32 rand_seed;
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131
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132 cyg_int32 total_tickets;
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133
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134 protected:
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135
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136 Cyg_Scheduler_Implementation(); // Constructor
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137
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138 // The following functions provide the scheduler implementation
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139 // interface to the Cyg_Scheduler class. These are protected
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140 // so that only the scheduler can call them.
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141
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142 // choose a new thread
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143 Cyg_Thread *schedule();
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144
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145 // make thread schedulable
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146 void add_thread(Cyg_Thread *thread);
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147
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148 // make thread un-schedulable
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149 void rem_thread(Cyg_Thread *thread);
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150
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151 // register thread with scheduler
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152 void register_thread(Cyg_Thread *thread);
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153
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154 // deregister thread
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155 void deregister_thread(Cyg_Thread *thread);
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156
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157 // Test the given priority for uniqueness
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158 cyg_bool unique( cyg_priority priority);
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159
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160 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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161
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162 // If timeslicing is enbled, define a scheduler
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163 // entry point to do timeslicing. This will be
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164 // called from the RTC DSR.
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165
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166 protected:
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167
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168 static cyg_count32 timeslice_count;
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169
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170 public:
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171 void timeslice();
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172
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173 static void reset_timeslice_count();
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174
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175 #endif
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176
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177
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178 };
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179
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180 // -------------------------------------------------------------------------
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181 // Cyg_Scheduler_Implementation inlines
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182
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183 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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184
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185 inline void Cyg_Scheduler_Implementation::reset_timeslice_count()
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186 {
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187 timeslice_count = CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS;
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188 }
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189
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190 #endif
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191
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192 // -------------------------------------------------------------------------
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193 // Scheduler thread implementation.
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194 // This class provides the implementation of the scheduler specific parts
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195 // of each thread.
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196
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197 class Cyg_SchedThread_Implementation
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198 {
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199 friend class Cyg_Scheduler_Implementation;
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200 friend class Cyg_ThreadQueue_Implementation;
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201
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202 Cyg_Thread *next; // next thread in queue
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203 Cyg_Thread *prev; // previous thread in queue
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204
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205 void insert( Cyg_Thread *thread ); // Insert thread in front of this
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206
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207 void remove(); // remove this from queue
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208
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209 protected:
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210
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211 cyg_priority priority; // current thread priority == tickets held
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212
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213 cyg_priority compensation_tickets; // sleep compensation
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214
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215 Cyg_SchedThread_Implementation(CYG_ADDRWORD sched_info);
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216
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217 void yield(); // Yield CPU to next thread
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218
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219 };
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220
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221 // -------------------------------------------------------------------------
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222 #endif // ifndef CYGONCE_KERNEL_LOTTERY_HXX
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223 // EOF lottery.hxx