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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 4c750ce71ae3
children d2c90368aeef
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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 //==========================================================================
208
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11 //####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
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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 bitmap 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.
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53 // Usage: Included according to configuration by
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54 // <cyg/kernel/sched.hxx>
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55 //
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56 //####DESCRIPTIONEND####
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57 //
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58 //==========================================================================
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59
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60 #include <cyg/kernel/ktypes.h>
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61
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62 // -------------------------------------------------------------------------
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63 // The macro CYGNUM_KERNEL_SCHED_BITMAP_SIZE contains the number of bits
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64 // that the scheduler bitmap should contain. It is derived from the number
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65 // of threads that the system is allowed to use during configuration.
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66
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67 #ifndef CYGNUM_KERNEL_SCHED_BITMAP_SIZE
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68 #define CYGNUM_KERNEL_SCHED_BITMAP_SIZE 32
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69 #endif
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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
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85
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86 #define CYG_THREAD_MIN_PRIORITY (CYGNUM_KERNEL_SCHED_BITMAP_SIZE-1)
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87 #define CYG_THREAD_MAX_PRIORITY 0
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88
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89 // set default scheduling info value for thread constructors.
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90 #define CYG_SCHED_DEFAULT_INFO CYG_THREAD_MAX_PRIORITY
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91
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92 // -------------------------------------------------------------------------
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93 // This class contains the implementation details of the scheduler, and
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94 // provides a standard API for accessing it.
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95
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96 class Cyg_Scheduler_Implementation
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97 : public Cyg_Scheduler_Base
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98 {
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99 friend class Cyg_ThreadQueue_Implementation;
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100 friend class Cyg_SchedThread_Implementation;
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101
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102 cyg_sched_bitmap run_queue;
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103
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104 Cyg_Thread *thread_table[CYGNUM_KERNEL_SCHED_BITMAP_SIZE];
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105
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106
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107 protected:
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108
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109 Cyg_Scheduler_Implementation(); // Constructor
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110
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111 // The following functions provide the scheduler implementation
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112 // interface to the Cyg_Scheduler class. These are protected
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113 // so that only the scheduler can call them.
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114
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115 // choose a new thread
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116 Cyg_Thread *schedule();
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117
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118 // make thread schedulable
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119 void add_thread(Cyg_Thread *thread);
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120
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121 // make thread un-schedulable
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122 void rem_thread(Cyg_Thread *thread);
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123
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124 // register thread with scheduler
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125 void register_thread(Cyg_Thread *thread);
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126
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127 // deregister thread
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128 void deregister_thread(Cyg_Thread *thread);
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129
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130 // Test the given priority for uniqueness
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131 cyg_bool unique( cyg_priority priority);
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132
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133 public:
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134 void set_idle_thread( Cyg_Thread *thread, HAL_SMP_CPU_TYPE cpu );
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135
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136 };
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137
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138 // -------------------------------------------------------------------------
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139 // Scheduler thread implementation.
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140 // This class provides the implementation of the scheduler specific parts
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141 // of each thread.
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142
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143 class Cyg_SchedThread_Implementation
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144 {
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145 friend class Cyg_Scheduler_Implementation;
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146 friend class Cyg_ThreadQueue_Implementation;
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147
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148 protected:
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149
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150 cyg_priority priority; // current thread priority
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151
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152 Cyg_SchedThread_Implementation(CYG_ADDRWORD sched_info);
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153
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154 void yield(); // Yield CPU to next thread
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155
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156 // These are not applicable in a bitmap scheduler; placeholders:
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157 inline void rotate_queue( cyg_priority pri ) { };
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158 inline void to_queue_head( void ) { };
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159 };
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160
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161 // -------------------------------------------------------------------------
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162 // Thread queue implementation.
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163 // This class provides the (scheduler specific) implementation of the
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164 // thread queue class.
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165
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166 class Cyg_ThreadQueue_Implementation
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167 {
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168 cyg_sched_bitmap wait_queue;
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169
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170 protected:
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171
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172 // API used by Cyg_ThreadQueue
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173
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174 Cyg_ThreadQueue_Implementation(); // Constructor
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175
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176 // Add thread to queue
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177 void enqueue(Cyg_Thread *thread);
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178
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179 // return first thread on queue
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180 Cyg_Thread *highpri();
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181
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182 // remove first thread on queue
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183 Cyg_Thread *dequeue();
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184
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185 // remove specified thread from queue
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186 void remove(Cyg_Thread *thread);
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187
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188 // test if queue is empty
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189 cyg_bool empty();
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190
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191 };
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192
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193 inline cyg_bool Cyg_ThreadQueue_Implementation::empty()
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194 {
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195 return wait_queue == 0;
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196 }
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197
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198 // -------------------------------------------------------------------------
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199
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200 #endif // ifndef CYGONCE_KERNEL_BITMAP_HXX
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201 // EOF bitmap.hxx