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annotate packages/kernel/current/include/mlqueue.hxx @ 124:0ec04793409a ecos-sw-2000-09-11

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Merge from eCos master repository on 2000-09-11-03:00:13-BST
author jlarmour
date Mon, 11 Sep 2000 02:42:46 +0000
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children 0ae0bc38e387
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1 #ifndef CYGONCE_KERNEL_MLQUEUE_HXX
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2 #define CYGONCE_KERNEL_MLQUEUE_HXX
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3
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4 //==========================================================================
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5 //
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6 // mlqueue.hxx
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7 //
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8 // Multi-Level Queue scheduler 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): nickg
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38 // Contributors: jlarmour
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39 // Date: 1997-09-10
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40 // Purpose: Define multilevel queue scheduler implementation
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41 // Description: The classes defined here are used as base classes
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42 // by the common classes that define schedulers and thread
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43 // things. The MLQ scheduler in various configurations
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44 // provides standard FIFO, round-robin and single priority
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45 // schedulers.
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46 // Usage: Included according to configuration by
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47 // <cyg/kernel/sched.hxx>
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //==========================================================================
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52
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53 #include <cyg/kernel/ktypes.h>
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54
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55 // -------------------------------------------------------------------------
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56 // The macro CYGNUM_KERNEL_SCHED_PRIORITIES contains the number of priorities
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57 // supported by the scheduler.
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58
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59 #ifndef CYGNUM_KERNEL_SCHED_PRIORITIES
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60 #define CYGNUM_KERNEL_SCHED_PRIORITIES 32 // define a default
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61 #endif
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62
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63 // set bitmap size
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64 #define CYGNUM_KERNEL_SCHED_BITMAP_SIZE CYGNUM_KERNEL_SCHED_PRIORITIES
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65
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66 // -------------------------------------------------------------------------
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67 // The macro CYGNUM_KERNEL_SCHED_BITMAP_SIZE contains the number of bits that the
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68 // scheduler bitmap should contain. It is derived from the number of prioirity
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69 // levels defined by the configuration.
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70
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71 #if CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 8
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72 typedef cyg_ucount8 cyg_sched_bitmap;
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73 #elif CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 16
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74 typedef cyg_ucount16 cyg_sched_bitmap;
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75 #elif CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 32
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76 typedef cyg_ucount32 cyg_sched_bitmap;
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77 #else
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78 #error Bitmaps greater than 32 bits not currently allowed
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79 #endif
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80
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81 // -------------------------------------------------------------------------
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82 // Customize the scheduler
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83
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84 #define CYGIMP_THREAD_PRIORITY 1 // Threads have changable priorities
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85 #define CYG_SCHED_UNIQUE_PRIORITIES 0 // Threads don't have unique priorities
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86
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87 #define CYG_THREAD_MIN_PRIORITY (CYGNUM_KERNEL_SCHED_PRIORITIES-1)
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88 #define CYG_THREAD_MAX_PRIORITY 0
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89
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90 // set default scheduling info value for thread constructors.
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91 #define CYG_SCHED_DEFAULT_INFO CYG_THREAD_MAX_PRIORITY
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92
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93 // -------------------------------------------------------------------------
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94 // Thread queue implementation.
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95 // This class provides the (scheduler specific) implementation of the
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96 // thread queue class.
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97
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98 class Cyg_ThreadQueue_Implementation
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99 {
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100 friend class Cyg_Scheduler_Implementation;
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101 friend class Cyg_SchedThread_Implementation;
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102 friend class Cyg_SchedulerThreadQueue_Implementation;
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103
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104 void set_thread_queue(Cyg_Thread *thread,
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105 Cyg_ThreadQueue *tq );
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106
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107 Cyg_Thread *queue;
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108
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109 protected:
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110
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111 // API used by Cyg_ThreadQueue
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112
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113 Cyg_ThreadQueue_Implementation(); // Constructor
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114
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115 // Add thread to queue
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116 void enqueue(Cyg_Thread *thread);
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117
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118 // return first thread on queue
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119 Cyg_Thread *highpri();
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120
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121 // remove first thread on queue
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122 Cyg_Thread *dequeue();
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123
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124 // remove specified thread from queue
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125 void remove(Cyg_Thread *thread);
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126
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127 // test if queue is empty
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128 cyg_bool empty();
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129
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130 void rotate(); // Rotate the queue
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131
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132 void to_head(Cyg_Thread *thread);
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133
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134 };
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135
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136 inline cyg_bool Cyg_ThreadQueue_Implementation::empty()
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137 {
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138 return queue == NULL;
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139 }
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140
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141 // thread queue used exclusively by the scheduler, with simpler enqueueing
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142
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143 class Cyg_SchedulerThreadQueue_Implementation
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144 : public Cyg_ThreadQueue_Implementation
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145 {
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146 public:
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147 void enqueue(Cyg_Thread *thread); // Add thread to queue
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148 };
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149
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150 // -------------------------------------------------------------------------
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151 // This class contains the implementation details of the scheduler, and
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152 // provides a standard API for accessing it.
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153
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154 class Cyg_Scheduler_Implementation
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155 : public Cyg_Scheduler_Base
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156 {
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157 friend class Cyg_ThreadQueue_Implementation;
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158 friend class Cyg_SchedThread_Implementation;
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159 friend class Cyg_HardwareThread;
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160
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161 // Mask of which run queues have ready threads
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162 cyg_sched_bitmap queue_map;
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163
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164 // Each run queue is a double linked circular list of threads.
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165 // These pointers point to the head element of each list.
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166 Cyg_SchedulerThreadQueue_Implementation run_queue[CYGNUM_KERNEL_SCHED_PRIORITIES];
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167
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168 protected:
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169
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170 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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171
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172 // Timeslice counter. This is decremented on each
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173 // clock tick, and a timeslice is performed each
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174 // time it zeroes.
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175
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176 static cyg_ucount32 timeslice_count;
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177
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178 static void reset_timeslice_count();
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179
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180 #endif
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181
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182 Cyg_Scheduler_Implementation(); // Constructor
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183
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184 // The following functions provide the scheduler implementation
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185 // interface to the Cyg_Scheduler class. These are protected
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186 // so that only the scheduler can call them.
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187
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188 // choose a new thread
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189 Cyg_Thread *schedule();
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190
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191 // make thread schedulable
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192 void add_thread(Cyg_Thread *thread);
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193
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194 // make thread un-schedulable
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195 void rem_thread(Cyg_Thread *thread);
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196
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197 // register thread with scheduler
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198 void register_thread(Cyg_Thread *thread);
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199
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200 // deregister thread
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201 void deregister_thread(Cyg_Thread *thread);
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202
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203 // Test the given priority for uniqueness
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204 cyg_bool unique( cyg_priority priority);
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205
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206 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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207
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208 // If timeslicing is enbled, define a scheduler
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209 // entry point to do timeslicing. This will be
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210 // called from the RTC DSR.
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211 public:
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212 void timeslice();
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213
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214 #endif
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215
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216 };
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217
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218 // -------------------------------------------------------------------------
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219 // Cyg_Scheduler_Implementation inlines
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220
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221 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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222
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223 inline void Cyg_Scheduler_Implementation::reset_timeslice_count()
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224 {
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225 timeslice_count = CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS;
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226 }
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227
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228 #endif
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229
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230 // -------------------------------------------------------------------------
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231 // Scheduler thread implementation.
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232 // This class provides the implementation of the scheduler specific parts
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233 // of each thread.
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234
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235 class Cyg_SchedThread_Implementation
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236 {
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237 friend class Cyg_Scheduler_Implementation;
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238 friend class Cyg_ThreadQueue_Implementation;
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239 friend class Cyg_SchedulerThreadQueue_Implementation;
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240
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241 Cyg_Thread *next; // next thread in queue
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242 Cyg_Thread *prev; // previous thread in queue
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243
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244 void insert( Cyg_Thread *thread ); // Insert thread in front of this
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245
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246 void remove(); // remove this from queue
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247
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248 protected:
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249
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250 cyg_priority priority; // current thread priority
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251
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252 Cyg_SchedThread_Implementation(CYG_ADDRWORD sched_info);
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253
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254 void yield(); // Yield CPU to next thread
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255
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256 static void rotate_queue( cyg_priority pri );
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257 // Rotate that run queue
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258
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259 void to_queue_head( void ); // Move this thread to the head
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260 // of its queue (not necessarily
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261 // a scheduler queue)
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262
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263 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE_ENABLE
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264
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265 // This defines whether this thread is subject to timeslicing.
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266 // If false, timeslice expiry has no effect on the thread.
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267
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268 cyg_bool timeslice_enabled;
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269
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270 public:
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271
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272 void timeslice_enable();
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273
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274 void timeslice_disable();
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275
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276 #endif
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277
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278 };
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279
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280 // -------------------------------------------------------------------------
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281 // Cyg_SchedThread_Implementation inlines.
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282
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283 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE_ENABLE
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284
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285 inline void Cyg_SchedThread_Implementation::timeslice_enable()
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286 {
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287 timeslice_enabled = true;
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288 }
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289
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290 inline void Cyg_SchedThread_Implementation::timeslice_disable()
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291 {
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292 timeslice_enabled = false;
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293 }
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294
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295 #endif
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296
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297
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298 // -------------------------------------------------------------------------
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299 #endif // ifndef CYGONCE_KERNEL_MLQUEUE_HXX
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300 // EOF mlqueue.hxx