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annotate packages/kernel/current/include/bitmap.hxx @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
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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 // ####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, 2006 Free Software Foundation, 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
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19 // version.
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20 //
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21 // eCos is distributed in the hope that it will be useful, but WITHOUT
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22 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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23 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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24 // for more details.
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25 //
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26 // You should have received a copy of the GNU General Public License
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27 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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28 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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29 //
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30 // As a special exception, if other files instantiate templates or use
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31 // macros or inline functions from this file, or you compile this file
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32 // and link it with other works to produce a work based on this file,
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33 // this file does not by itself cause the resulting work to be covered by
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34 // the GNU General Public License. However the source code for this file
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35 // must still be made available in accordance with section (3) of the GNU
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36 // General Public License v2.
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37 //
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38 // This exception does not invalidate any other reasons why a work based
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39 // on this file might be covered by the GNU General Public License.
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40 // -------------------------------------------
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41 // ####ECOSGPLCOPYRIGHTEND####
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42 //==========================================================================
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43 //#####DESCRIPTIONBEGIN####
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44 //
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45 // Author(s): nickg
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46 // Contributors: nickg
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47 // Date: 1997-09-10
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48 // Purpose: Define bitmap scheduler implementation
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49 // Description: The classes defined here are used as base classes
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50 // by the common classes that define schedulers and thread
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51 // things.
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52 // Usage: Included according to configuration by
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53 // <cyg/kernel/sched.hxx>
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54 //
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55 //####DESCRIPTIONEND####
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56 //
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57 //==========================================================================
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58
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59 #include <cyg/kernel/ktypes.h>
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60
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61 // -------------------------------------------------------------------------
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62 // The macro CYGNUM_KERNEL_SCHED_BITMAP_SIZE contains the number of bits
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63 // that the scheduler bitmap should contain. It is derived from the number
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64 // of threads that the system is allowed to use during configuration.
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65
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66 #ifndef CYGNUM_KERNEL_SCHED_BITMAP_SIZE
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67 #define CYGNUM_KERNEL_SCHED_BITMAP_SIZE 32
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68 #endif
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69
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70 #if CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 8
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71 typedef cyg_ucount8 cyg_sched_bitmap;
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72 #elif CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 16
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73 typedef cyg_ucount16 cyg_sched_bitmap;
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74 #elif CYGNUM_KERNEL_SCHED_BITMAP_SIZE <= 32
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75 typedef cyg_ucount32 cyg_sched_bitmap;
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76 #else
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77 #error Bitmaps greater than 32 bits not currently allowed
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78 #endif
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79
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80 // -------------------------------------------------------------------------
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81 // Customize the scheduler
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82
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83 #define CYGIMP_THREAD_PRIORITY 1
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84
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85 #define CYG_THREAD_MIN_PRIORITY (CYGNUM_KERNEL_SCHED_BITMAP_SIZE-1)
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86 #define CYG_THREAD_MAX_PRIORITY 0
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87
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88 // set default scheduling info value for thread constructors.
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89 #define CYG_SCHED_DEFAULT_INFO CYG_THREAD_MAX_PRIORITY
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90
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91 // -------------------------------------------------------------------------
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92 // This class contains the implementation details of the scheduler, and
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93 // provides a standard API for accessing it.
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94
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95 class Cyg_Scheduler_Implementation
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96 : public Cyg_Scheduler_Base
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97 {
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98 friend class Cyg_ThreadQueue_Implementation;
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99 friend class Cyg_SchedThread_Implementation;
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100
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101 cyg_sched_bitmap run_queue;
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102
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103 Cyg_Thread *thread_table[CYGNUM_KERNEL_SCHED_BITMAP_SIZE];
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104
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105
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106 protected:
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107
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108 Cyg_Scheduler_Implementation(); // Constructor
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109
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110 // The following functions provide the scheduler implementation
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111 // interface to the Cyg_Scheduler class. These are protected
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112 // so that only the scheduler can call them.
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113
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114 // choose a new thread
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115 Cyg_Thread *schedule();
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116
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117 // make thread schedulable
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118 void add_thread(Cyg_Thread *thread);
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119
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120 // make thread un-schedulable
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121 void rem_thread(Cyg_Thread *thread);
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122
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123 // register thread with scheduler
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124 void register_thread(Cyg_Thread *thread);
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125
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126 // deregister thread
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127 void deregister_thread(Cyg_Thread *thread);
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128
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129 // Test the given priority for uniqueness
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130 cyg_bool unique( cyg_priority priority);
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131
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132 public:
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133 void set_idle_thread( Cyg_Thread *thread, HAL_SMP_CPU_TYPE cpu );
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134
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135 };
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136
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137 // -------------------------------------------------------------------------
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138 // Scheduler thread implementation.
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139 // This class provides the implementation of the scheduler specific parts
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140 // of each thread.
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141
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142 class Cyg_SchedThread_Implementation
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143 {
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144 friend class Cyg_Scheduler_Implementation;
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145 friend class Cyg_ThreadQueue_Implementation;
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146
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147 protected:
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148
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149 cyg_priority priority; // current thread priority
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150
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151 Cyg_SchedThread_Implementation(CYG_ADDRWORD sched_info);
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152
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153 void yield(); // Yield CPU to next thread
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154
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155 // These are not applicable in a bitmap scheduler; placeholders:
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156 inline void rotate_queue( cyg_priority pri ) { };
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157 inline void to_queue_head( void ) { };
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158
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159 inline void timeslice_save() {};
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160 inline void timeslice_restore() {};
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161 inline void timeslice_reset() {};
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162
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163 };
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164
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165 // -------------------------------------------------------------------------
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166 // Thread queue implementation.
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167 // This class provides the (scheduler specific) implementation of the
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168 // thread queue class.
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169
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170 class Cyg_ThreadQueue_Implementation
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171 {
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172 cyg_sched_bitmap wait_queue;
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173
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174 protected:
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175
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176 // API used by Cyg_ThreadQueue
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177
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178 Cyg_ThreadQueue_Implementation(); // Constructor
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179
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180 // Add thread to queue
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181 void enqueue(Cyg_Thread *thread);
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182
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183 // return first thread on queue
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184 Cyg_Thread *highpri();
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185
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186 // remove first thread on queue
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187 Cyg_Thread *dequeue();
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188
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189 // remove specified thread from queue
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190 void remove(Cyg_Thread *thread);
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191
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192 // test if queue is empty
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193 cyg_bool empty();
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194
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195 };
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196
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197 inline cyg_bool Cyg_ThreadQueue_Implementation::empty()
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198 {
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199 return wait_queue == 0;
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200 }
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201
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202 // -------------------------------------------------------------------------
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203
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204 #endif // ifndef CYGONCE_KERNEL_BITMAP_HXX
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205 // EOF bitmap.hxx