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annotate packages/kernel/current/src/sched/mlqueue.cxx @ 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
parents 6ed91473a1cd
children 0c2b7be0d798
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1 //==========================================================================
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2 //
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3 // sched/mlqueue.cxx
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4 //
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5 // Multi-level queue scheduler class implementation
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: jlarmour
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36 // Date: 1999-02-17
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37 // Purpose: Multilevel queue scheduler class implementation
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38 // Description: This file contains the implementations of
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39 // Cyg_Scheduler_Implementation and
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40 // Cyg_SchedThread_Implementation.
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41 //
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42 //
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43 //####DESCRIPTIONEND####
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44 //
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45 //==========================================================================
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46
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47 #include <pkgconf/kernel.h>
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48
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49 #include <cyg/kernel/ktypes.h> // base kernel types
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50 #include <cyg/infra/cyg_trac.h> // tracing macros
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51 #include <cyg/infra/cyg_ass.h> // assertion macros
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52
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53 #include <cyg/kernel/sched.hxx> // our header
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54
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55 #include <cyg/hal/hal_arch.h> // Architecture specific definitions
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56
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57 #include <cyg/kernel/thread.inl> // thread inlines
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58 #include <cyg/kernel/sched.inl> // scheduler inlines
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59
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60 #ifdef CYGSEM_KERNEL_SCHED_MLQUEUE
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61
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62 //-------------------------------------------------------------------------
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63 // Some local tracing control - a default.
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64 #ifdef CYGDBG_USE_TRACING
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65 # if !defined( CYGDBG_INFRA_DEBUG_TRACE_ASSERT_SIMPLE ) && \
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66 !defined( CYGDBG_INFRA_DEBUG_TRACE_ASSERT_FANCY )
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67 // ie. not a tracing implementation that takes a long time to output
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68
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69 # ifndef CYGDBG_KERNEL_TRACE_TIMESLICE
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70 # define CYGDBG_KERNEL_TRACE_TIMESLICE
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71 # endif // control not already defined
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72
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73 # endif // trace implementation not ..._SIMPLE && not ..._FANCY
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74 #endif // CYGDBG_USE_TRACING
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75
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76 //==========================================================================
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77 // Cyg_Scheduler_Implementation class static members
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78
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79 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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80
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81 cyg_ucount32 Cyg_Scheduler_Implementation::timeslice_count =
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82 CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS;
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83
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84 #endif
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85
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86
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87 //==========================================================================
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88 // Cyg_Scheduler_Implementation class members
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89
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90 // -------------------------------------------------------------------------
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91 // Constructor.
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92
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93 Cyg_Scheduler_Implementation::Cyg_Scheduler_Implementation()
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94 {
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95 CYG_REPORT_FUNCTION();
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96
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97 queue_map = 0;
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98
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99 CYG_REPORT_RETURN();
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100 }
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101
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102 // -------------------------------------------------------------------------
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103 // Choose the best thread to run next
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104
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105 Cyg_Thread *
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106 Cyg_Scheduler_Implementation::schedule(void)
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107 {
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108 CYG_REPORT_FUNCTYPE("returning thread %08x");
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109
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110 // The run queue may _never_ be empty, there is always
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111 // an idle thread at the lowest priority.
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112
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113 CYG_ASSERT( queue_map != 0, "Run queue empty");
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114 CYG_ASSERT( queue_map & (1<<CYG_THREAD_MIN_PRIORITY), "Idle thread vanished!!!");
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115 CYG_ASSERT( !run_queue[CYG_THREAD_MIN_PRIORITY].empty(), "Idle thread vanished!!!");
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116
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117 register cyg_uint32 index;
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118
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119 HAL_LSBIT_INDEX(index, queue_map);
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120
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121 Cyg_Thread *thread = run_queue[index].highpri();
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122
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123 CYG_ASSERT( thread != NULL , "No threads in run queue");
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124
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125 CYG_REPORT_RETVAL(thread);
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126
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127 return thread;
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128 }
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129
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130 // -------------------------------------------------------------------------
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131
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132 void
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133 Cyg_Scheduler_Implementation::add_thread(Cyg_Thread *thread)
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134 {
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135 CYG_REPORT_FUNCTION();
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136 CYG_REPORT_FUNCARG1("thread=%08x", thread);
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137
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138 cyg_priority pri = thread->priority;
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139 Cyg_SchedulerThreadQueue_Implementation *queue = &run_queue[pri];
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140
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141 CYG_ASSERT((CYG_THREAD_MIN_PRIORITY >= pri)
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142 && (CYG_THREAD_MAX_PRIORITY <= pri),
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143 "Priority out of range!");
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144
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145 // If the thread is on some other queue, remove it
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146 // here.
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147 if( thread->queue != NULL )
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148 {
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149 thread->queue->remove(thread);
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150 thread->queue = NULL;
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151 }
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152
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153 if( queue->empty() )
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154 {
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155 // set the map bit and ask for a reschedule if this is a
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156 // new highest priority thread.
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157
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158 queue_map |= (1<<pri);
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159
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160 // If the new thread is higher priority than the
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161 // current thread, request a reschedule.
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162
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163 if( pri < Cyg_Scheduler::get_current_thread()->priority )
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164 need_reschedule = true;
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165
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166 }
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167 // else the queue already has an occupant, queue behind him
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168
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169 CYG_ASSERT( queue_map != 0, "Run queue empty");
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170 CYG_ASSERT( queue_map & (1<<pri), "Queue map bit not set for pri");
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171 CYG_ASSERT( queue_map & (1<<CYG_THREAD_MIN_PRIORITY), "Idle thread vanished!!!");
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172 // CYG_ASSERT( !run_queue[CYG_THREAD_MIN_PRIORITY].empty(), "Idle thread vanished!!!");
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173
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174 queue->enqueue(thread);
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175
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176 CYG_REPORT_RETURN();
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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 void
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182 Cyg_Scheduler_Implementation::rem_thread(Cyg_Thread *thread)
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183 {
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184 CYG_REPORT_FUNCTION();
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185 CYG_REPORT_FUNCARG1("thread=%08x", thread);
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186
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187 CYG_ASSERT( queue_map != 0, "Run queue empty");
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188
124
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189 cyg_priority pri = thread->priority;
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190 Cyg_SchedulerThreadQueue_Implementation *queue = &run_queue[pri];
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191
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192 CYG_ASSERT( pri != CYG_THREAD_MIN_PRIORITY, "Idle thread trying to sleep!");
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193 CYG_ASSERT( queue_map & (1<<pri), "Queue map bit not set for pri");
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194 CYG_ASSERT( !run_queue[CYG_THREAD_MIN_PRIORITY].empty(), "Idle thread vanished!!!");
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195
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196 // remove thread from queue
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197 queue->remove(thread);
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198
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199 if( queue->empty() )
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200 {
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201 // If this was only thread in
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202 // queue, clear map.
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203
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204 queue_map &= ~(1<<pri);
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205 }
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206
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207 CYG_ASSERT( queue_map != 0, "Run queue empty");
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208 CYG_ASSERT( queue_map & (1<<CYG_THREAD_MIN_PRIORITY), "Idle thread vanished!!!");
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209 CYG_ASSERT( !run_queue[CYG_THREAD_MIN_PRIORITY].empty(), "Idle thread vanished!!!");
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210
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211 CYG_REPORT_RETURN();
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212 }
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213
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214 // -------------------------------------------------------------------------
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215 // register thread with scheduler
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216
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217 void
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218 Cyg_Scheduler_Implementation::register_thread(Cyg_Thread *thread)
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219 {
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220 CYG_REPORT_FUNCTION();
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221 CYG_REPORT_FUNCARG1("thread=%08x", thread);
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222 // No registration necessary in this scheduler
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223 CYG_REPORT_RETURN();
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224 }
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225
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226 // -------------------------------------------------------------------------
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227
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228 // deregister thread
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229 void
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230 Cyg_Scheduler_Implementation::deregister_thread(Cyg_Thread *thread)
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231 {
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232 CYG_REPORT_FUNCTION();
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233 CYG_REPORT_FUNCARG1("thread=%08x", thread);
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234 // No registration necessary in this scheduler
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235 CYG_REPORT_RETURN();
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236 }
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237
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238 // -------------------------------------------------------------------------
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239 // Test the given priority for uniqueness
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240
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241 cyg_bool
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242 Cyg_Scheduler_Implementation::unique( cyg_priority priority)
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243 {
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244 CYG_REPORT_FUNCTYPE("returning %d");
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245 CYG_REPORT_FUNCARG1("priority=%d", priority);
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246 // Priorities are not unique
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247 CYG_REPORT_RETVAL(true);
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248 return true;
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249 }
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250
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251 //==========================================================================
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252 // Support for timeslicing option
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253
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254 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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255
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256 void
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257 Cyg_Scheduler_Implementation::timeslice(void)
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258 {
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259 #ifdef CYGDBG_KERNEL_TRACE_TIMESLICE
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260 CYG_REPORT_FUNCTION();
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261 #endif
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262 CYG_ASSERT( queue_map != 0, "Run queue empty");
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263 CYG_ASSERT( queue_map & (1<<CYG_THREAD_MIN_PRIORITY), "Idle thread vanished!!!");
115
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264
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265 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE_ENABLE
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266 if( current_thread->timeslice_enabled && --timeslice_count == 0 )
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267 #else
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268 if( --timeslice_count == 0 )
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269 #endif
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270 {
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271 CYG_INSTRUMENT_SCHED(TIMESLICE,0,0);
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272 #ifdef CYGDBG_KERNEL_TRACE_TIMESLICE
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273 CYG_TRACE0( true, "quantum consumed, time to reschedule" );
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274 #endif
124
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275
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276 CYG_ASSERT( sched_lock > 0 , "Timeslice called with zero sched_lock");
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277
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278 Cyg_Thread *thread = current_thread;
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279 Cyg_Scheduler *sched = &Cyg_Scheduler::scheduler;
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280
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281 CYG_ASSERTCLASS( thread, "Bad current thread");
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282 CYG_ASSERTCLASS( sched, "Bad scheduler");
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283
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284 cyg_priority pri = thread->priority;
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285 Cyg_SchedulerThreadQueue_Implementation *queue = &sched->run_queue[pri];
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286
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287 queue->rotate();
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288
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289 if( queue->highpri() != thread )
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290 sched->need_reschedule = true;
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291
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292 timeslice_count = CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS;
0
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293 }
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294
115
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295
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296 CYG_ASSERT( queue_map & (1<<CYG_THREAD_MIN_PRIORITY), "Idle thread vanished!!!");
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297 CYG_ASSERT( !run_queue[CYG_THREAD_MIN_PRIORITY].empty(), "Idle thread vanished!!!");
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298 #ifdef CYGDBG_KERNEL_TRACE_TIMESLICE
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299 CYG_REPORT_RETURN();
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300 #endif
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301 }
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302
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303 #endif
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304
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305 //==========================================================================
115
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306 // Cyg_SchedThread_Implementation class members
0
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307
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308 Cyg_SchedThread_Implementation::Cyg_SchedThread_Implementation
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309 (
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310 CYG_ADDRWORD sched_info
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311 )
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312 {
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313 CYG_REPORT_FUNCTION();
2
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314 CYG_REPORT_FUNCARG1("sched_info=%08x", sched_info);
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315
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316 // Set priority to the supplied value.
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317 priority = (cyg_priority)sched_info;
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318
115
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319 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE_ENABLE
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320 // If timeslice_enabled exists, set it true by default
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321 timeslice_enabled = true;
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322 #endif
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323
0
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324 // point the next and prev field at this thread.
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325
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326 next = prev = CYG_CLASSFROMBASE(Cyg_Thread,
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327 Cyg_SchedThread_Implementation,
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328 this);
2
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329 CYG_REPORT_RETURN();
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330 }
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331
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332 // -------------------------------------------------------------------------
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333 // Insert thread in front of this
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334
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335 void
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336 Cyg_SchedThread_Implementation::insert( Cyg_Thread *thread)
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337 {
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338 CYG_REPORT_FUNCTION();
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339 CYG_REPORT_FUNCARG1("thread=%08x", thread);
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340
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341 thread->next = CYG_CLASSFROMBASE(Cyg_Thread,
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342 Cyg_SchedThread_Implementation,
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343 this);
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344 thread->prev = prev;
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345 prev->next = thread;
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346 prev = thread;
2
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347
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348 CYG_REPORT_RETURN();
0
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349 }
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350
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351 // -------------------------------------------------------------------------
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352 // remove this from queue
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353
2
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354 void
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355 Cyg_SchedThread_Implementation::remove(void)
0
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356 {
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357 CYG_REPORT_FUNCTION();
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358
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359 next->prev = prev;
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360 prev->next = next;
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361 next = prev = CYG_CLASSFROMBASE(Cyg_Thread,
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362 Cyg_SchedThread_Implementation,
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363 this);
2
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364 CYG_REPORT_RETURN();
0
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365 }
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366
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367 // -------------------------------------------------------------------------
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368 // Yield the processor to another thread
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369
2
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370 void
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371 Cyg_SchedThread_Implementation::yield(void)
0
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372 {
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373 CYG_REPORT_FUNCTION();
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374
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375 // Prevent preemption
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376 Cyg_Scheduler::lock();
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377
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378 Cyg_Thread *thread = CYG_CLASSFROMBASE(Cyg_Thread,
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379 Cyg_SchedThread_Implementation,
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380 this);
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381
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382 // Only do this if this thread is running. If it is not, there
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383 // is no point.
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384
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385 if( thread->get_state() == Cyg_Thread::RUNNING )
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386 {
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387 // To yield we simply rotate the appropriate
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388 // run queue to the next thread and reschedule.
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389
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390 CYG_ASSERTCLASS( thread, "Bad current thread");
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391
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392 Cyg_Scheduler *sched = &Cyg_Scheduler::scheduler;
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393
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394 CYG_ASSERTCLASS( sched, "Bad scheduler");
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395
124
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396 cyg_priority pri = thread->priority;
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397 Cyg_SchedulerThreadQueue_Implementation *queue = &sched->run_queue[pri];
0
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398
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399 queue->rotate();
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400
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401 if( queue->highpri() != thread )
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402 sched->need_reschedule = true;
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403 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE
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404 // Reset the timeslice counter so that this thread gets a full
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405 // quantum.
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406 else Cyg_Scheduler::reset_timeslice_count();
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407 #endif
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408 }
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409
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410 // Unlock the scheduler and switch threads
124
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411 #ifdef CYGDBG_USE_ASSERTS
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412 // This test keeps the assertions in unlock_inner() happy if
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413 // need_reschedule was not set above.
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414 if( !Cyg_Scheduler::need_reschedule )
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415 Cyg_Scheduler::unlock();
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416 else
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417 #endif
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418 Cyg_Scheduler::unlock_reschedule();
0
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419
124
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420
2
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421 CYG_REPORT_RETURN();
0
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422 }
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423
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424 // -------------------------------------------------------------------------
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425 // Rotate the run queue at a specified priority.
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426 // (pri is the decider, no this, so the routine is static)
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427
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428 void
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429 Cyg_SchedThread_Implementation::rotate_queue( cyg_priority pri )
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430 {
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431 CYG_REPORT_FUNCTION();
2
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432 CYG_REPORT_FUNCARG1("priority=%d", pri);
0
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433
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434 // Prevent preemption
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435 Cyg_Scheduler::lock();
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436
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437 Cyg_Scheduler *sched = &Cyg_Scheduler::scheduler;
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438
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439 CYG_ASSERTCLASS( sched, "Bad scheduler");
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440
124
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441 Cyg_SchedulerThreadQueue_Implementation *queue = &sched->run_queue[pri];
0
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442
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443 if ( !queue->empty() ) {
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444 queue->rotate();
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445 sched->need_reschedule = true;
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446 }
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447
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448 // Unlock the scheduler and switch threads
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449 Cyg_Scheduler::unlock();
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450
2
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451 CYG_REPORT_RETURN();
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452 }
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453
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454 // -------------------------------------------------------------------------
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455 // Move this thread to the head of its queue
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456 // (not necessarily a scheduler queue)
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457
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458 void
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459 Cyg_SchedThread_Implementation::to_queue_head( void )
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460 {
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461 CYG_REPORT_FUNCTION();
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462
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463 // Prevent preemption
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464 Cyg_Scheduler::lock();
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diff changeset
465
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466 Cyg_Thread *thread = CYG_CLASSFROMBASE(Cyg_Thread,
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467 Cyg_SchedThread_Implementation,
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468 this);
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diff changeset
469
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470 CYG_ASSERTCLASS( thread, "Bad current thread");
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diff changeset
471
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472 Cyg_ThreadQueue *q = thread->get_current_queue();
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473 q->to_head( thread );
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diff changeset
474
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diff changeset
475 // Unlock the scheduler and switch threads
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476 Cyg_Scheduler::unlock();
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diff changeset
477
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478 CYG_REPORT_RETURN();
0
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479 }
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480
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481 //==========================================================================
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482 // Cyg_ThreadQueue_Implementation class members
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diff changeset
483
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484 Cyg_ThreadQueue_Implementation::Cyg_ThreadQueue_Implementation()
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485 {
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486 CYG_REPORT_FUNCTION();
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487
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488 queue = NULL; // empty queue
2
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diff changeset
489
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490 CYG_REPORT_RETURN();
0
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491 }
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492
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diff changeset
493
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494
2
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495 void
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496 Cyg_ThreadQueue_Implementation::enqueue(Cyg_Thread *thread)
0
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497 {
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498 CYG_REPORT_FUNCTION();
2
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499 CYG_REPORT_FUNCARG1("thread=%08x", thread);
0
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500
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501 if( queue == NULL ) queue = thread;
115
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502 else {
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503 #ifdef CYGIMP_KERNEL_SCHED_SORTED_QUEUES
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504
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505 // Insert the thread into the queue in priority order.
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diff changeset
506
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diff changeset
507 if( queue == queue->next )
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diff changeset
508 {
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diff changeset
509 // There is only one other thread in the queue, join it
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diff changeset
510 // and adjust the queue pointer to point to the highest
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diff changeset
511 // priority of the two. If they are the same priority,
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diff changeset
512 // leave the pointer pointing to the oldest.
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diff changeset
513
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514 queue->insert( thread );
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diff changeset
515
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diff changeset
516 if( thread->priority < queue->priority )
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diff changeset
517 queue = thread;
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518 }
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diff changeset
519 else
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diff changeset
520 {
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521 // There is more than one thread in the queue. First check
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522 // whether we are of higher priority than the head and if
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diff changeset
523 // so just jump in at the front. Also check whether we are
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diff changeset
524 // lower priority than the tail and jump onto the end.
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parents: 66
diff changeset
525 // Otherwise we really have to search the queue to find
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
526 // our place.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
527
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
528 if( thread->priority < queue->priority )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
529 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
530 queue->insert( thread );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
531 queue = thread;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
532 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
533 else if( thread->priority > queue->prev->priority )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
534 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
535 // We are lower priority than any thread in the queue,
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
536 // go in at the end.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
537
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
538 queue->prev->insert( thread );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
539 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
540 else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
541 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
542 // Search the queue. We do this backwards so that we
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
543 // always add new threads after any that have the same
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
544 // priority.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
545
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
546 // Because of the previous tests we know that this
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
547 // search will terminate before we hit the head of the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
548 // queue, hence we do not need to check for that
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
549 // condition.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
550
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
551 Cyg_Thread *qtmp = queue->prev;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
552
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
553 // Scan the queue until we find a higher or equal
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
554 // priority thread.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
555
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
556 while( thread->priority > qtmp->priority )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
557 qtmp = qtmp->prev;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
558
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
559 // Insert ourself after the node pointed to by qtmp.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
560 // We do this by inserting before the next node since
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
561 // that is the operation we have.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
562
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
563 qtmp->next->insert( thread );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
564 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
565
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
566 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
567 #else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
568 queue->prev->insert(thread);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
569 #endif
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
570 }
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
571
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
572 thread->queue = CYG_CLASSFROMBASE(Cyg_ThreadQueue,
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
573 Cyg_ThreadQueue_Implementation,
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
574 this);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
575 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
576 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
577
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
578 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
579
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
580 Cyg_Thread *
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
581 Cyg_ThreadQueue_Implementation::dequeue(void)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
582 {
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
583 CYG_REPORT_FUNCTYPE("returning thread %08x");
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
584
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
585 if( queue == NULL ) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
586 CYG_REPORT_RETVAL(NULL);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
587 return NULL;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
588 }
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
589
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
590 Cyg_Thread *thread = queue;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
591
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
592 if( thread->next == thread )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
593 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
594 // sole thread on list, NULL out ptr
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
595 queue = NULL;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
596 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
597 else
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
598 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
599 // advance to next and remove thread
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
600 queue = thread->next;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
601 thread->remove();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
602 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
603
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
604 thread->queue = NULL;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
605
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
606 CYG_REPORT_RETVAL(thread);
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
607 return thread;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
608 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
609
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
610 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
611
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
612 Cyg_Thread *
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
613 Cyg_ThreadQueue_Implementation::highpri(void)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
614 {
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
615 CYG_REPORT_FUNCTYPE("returning thread %08x");
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
616 CYG_REPORT_RETVAL(queue);
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
617 return queue;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
618 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
619
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
620 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
621
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
622 void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
623 Cyg_ThreadQueue_Implementation::remove(Cyg_Thread *thread)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
624 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
625 CYG_REPORT_FUNCTION();
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
626 CYG_REPORT_FUNCARG1("thread=%08x", thread);
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
627
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
628 // If the thread we want is the at the head
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
629 // of the list, and is on its own, clear the
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
630 // list and return. Otherwise advance to the
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
631 // next thread and remove ours. If the thread
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
632 // is not at the head of the list, just dequeue
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
633 // it.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
634
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
635 thread->queue = NULL;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
636
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
637 if( queue == thread )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
638 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
639 if( thread->next == thread )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
640 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
641 queue = NULL;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
642 return;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
643 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
644 else queue = thread->next;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
645 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
646
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
647 thread->Cyg_SchedThread_Implementation::remove();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
648
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
649 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
650 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
651
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
652 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
653 // Rotate the front thread on the queue to the back.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
654
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
655 void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
656 Cyg_ThreadQueue_Implementation::rotate(void)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
657 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
658 CYG_REPORT_FUNCTION();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
659
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
660 queue = queue->next;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
661
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
662 CYG_REPORT_RETURN();
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
663 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
664
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
665 // -------------------------------------------------------------------------
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
666 // Rotate or move the thread quoted to the front.
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
667
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
668 void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
669 Cyg_ThreadQueue_Implementation::to_head(Cyg_Thread *thread)
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
670 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
671 CYG_REPORT_FUNCTION();
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
672
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
673 queue = thread;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
674
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
675 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
676 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
677
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
678 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
679
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
680 inline void
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
681 Cyg_ThreadQueue_Implementation::set_thread_queue(Cyg_Thread *thread,
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
682 Cyg_ThreadQueue *tq )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
683
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
684 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
685 thread->queue = tq;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
686 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
687
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
688 // -------------------------------------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
689
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
690 void
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
691 Cyg_SchedulerThreadQueue_Implementation::enqueue(Cyg_Thread *thread)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
692 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
693 CYG_REPORT_FUNCTION();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
694 CYG_REPORT_FUNCARG1("thread=%08x", thread);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
695
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
696 if( queue == NULL ) queue = thread;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
697 else queue->prev->insert(thread);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 66
diff changeset
698
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699 set_thread_queue( thread, CYG_CLASSFROMBASE(Cyg_ThreadQueue,
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700 Cyg_SchedulerThreadQueue_Implementation,
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701 this));
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702 CYG_REPORT_RETURN();
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703 }
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704
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705 // -------------------------------------------------------------------------
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706
0
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707 #endif
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708
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709 // -------------------------------------------------------------------------
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710 // EOF sched/mlqueue.cxx