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annotate packages/kernel/current/include/bitmap.hxx @ 132:0ae0bc38e387 ecos-sw-2000-10-31

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Merge from eCos master repository on 2000-10-31-00:30:36-GMT
author jlarmour
date Tue, 31 Oct 2000 20:53:09 +0000
parents bf00f99aec69
children 4c750ce71ae3
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1 #ifndef CYGONCE_KERNEL_BITMAP_HXX
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2 #define CYGONCE_KERNEL_BITMAP_HXX
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3
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4 //==========================================================================
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5 //
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6 // bitmap.hxx
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7 //
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8 // Bitmap scheduler class declaration(s)
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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: nickg
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39 // Date: 1997-09-10
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40 // Purpose: Define bitmap 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.
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44 // Usage: Included according to configuration by
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45 // <cyg/kernel/sched.hxx>
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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/kernel/ktypes.h>
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52
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53 // -------------------------------------------------------------------------
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54 // The macro CYGNUM_KERNEL_SCHED_BITMAP_SIZE contains the number of bits
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55 // that the scheduler bitmap should contain. It is derived from the number
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56 // of threads that the system is allowed to use during configuration.
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57
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58 #ifndef CYGNUM_KERNEL_SCHED_BITMAP_SIZE
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59 #define CYGNUM_KERNEL_SCHED_BITMAP_SIZE 32
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60 #endif
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61
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62 #if CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 8
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63 typedef cyg_ucount8 cyg_sched_bitmap;
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64 #elif CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 16
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65 typedef cyg_ucount16 cyg_sched_bitmap;
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66 #elif CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 32
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67 typedef cyg_ucount32 cyg_sched_bitmap;
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68 #else
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69 #error Bitmaps greater than 32 bits not currently allowed
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70 #endif
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71
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72 // -------------------------------------------------------------------------
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73 // Customize the scheduler
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74
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75 #define CYGIMP_THREAD_PRIORITY 1
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76
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77 #define CYG_THREAD_MIN_PRIORITY (CYGNUM_KERNEL_SCHED_BITMAP_SIZE-1)
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78 #define CYG_THREAD_MAX_PRIORITY 0
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79
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80 // set default scheduling info value for thread constructors.
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81 #define CYG_SCHED_DEFAULT_INFO CYG_THREAD_MAX_PRIORITY
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82
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83 // -------------------------------------------------------------------------
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84 // This class contains the implementation details of the scheduler, and
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85 // provides a standard API for accessing it.
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86
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87 class Cyg_Scheduler_Implementation
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88 : public Cyg_Scheduler_Base
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89 {
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90 friend class Cyg_ThreadQueue_Implementation;
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91 friend class Cyg_SchedThread_Implementation;
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92
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93 cyg_sched_bitmap run_queue;
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94
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95 Cyg_Thread *thread_table[CYGNUM_KERNEL_SCHED_BITMAP_SIZE];
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96
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97
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98 protected:
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99
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100 Cyg_Scheduler_Implementation(); // Constructor
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101
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102 // The following functions provide the scheduler implementation
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103 // interface to the Cyg_Scheduler class. These are protected
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104 // so that only the scheduler can call them.
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105
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106 // choose a new thread
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107 Cyg_Thread *schedule();
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108
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109 // make thread schedulable
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110 void add_thread(Cyg_Thread *thread);
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111
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112 // make thread un-schedulable
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113 void rem_thread(Cyg_Thread *thread);
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114
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115 // register thread with scheduler
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116 void register_thread(Cyg_Thread *thread);
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117
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118 // deregister thread
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119 void deregister_thread(Cyg_Thread *thread);
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120
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121 // Test the given priority for uniqueness
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122 cyg_bool unique( cyg_priority priority);
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123
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124 };
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125
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126 // -------------------------------------------------------------------------
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127 // Scheduler thread implementation.
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128 // This class provides the implementation of the scheduler specific parts
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129 // of each thread.
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130
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131 class Cyg_SchedThread_Implementation
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132 {
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133 friend class Cyg_Scheduler_Implementation;
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134 friend class Cyg_ThreadQueue_Implementation;
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135
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136 protected:
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137
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138 cyg_priority priority; // current thread priority
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139
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140 Cyg_SchedThread_Implementation(CYG_ADDRWORD sched_info);
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141
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142 void yield(); // Yield CPU to next thread
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143
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144 // These are not applicable in a bitmap scheduler; placeholders:
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145 inline void rotate_queue( cyg_priority pri ) { };
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146 inline void to_queue_head( void ) { };
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147 };
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148
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149 // -------------------------------------------------------------------------
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150 // Thread queue implementation.
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151 // This class provides the (scheduler specific) implementation of the
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152 // thread queue class.
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153
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154 class Cyg_ThreadQueue_Implementation
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155 {
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156 cyg_sched_bitmap wait_queue;
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157
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158 protected:
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159
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160 // API used by Cyg_ThreadQueue
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161
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162 Cyg_ThreadQueue_Implementation(); // Constructor
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163
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164 // Add thread to queue
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165 void enqueue(Cyg_Thread *thread);
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166
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167 // return first thread on queue
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168 Cyg_Thread *highpri();
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169
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170 // remove first thread on queue
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171 Cyg_Thread *dequeue();
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172
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173 // remove specified thread from queue
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174 void remove(Cyg_Thread *thread);
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175
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176 // test if queue is empty
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177 cyg_bool empty();
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178
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179 };
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180
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181 inline cyg_bool Cyg_ThreadQueue_Implementation::empty()
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182 {
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183 return wait_queue == 0;
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184 }
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185
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186 // -------------------------------------------------------------------------
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187
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188 #endif // ifndef CYGONCE_KERNEL_BITMAP_HXX
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189 // EOF bitmap.hxx