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annotate packages/kernel/current/include/sched.hxx @ 128:0c2b7be0d798 ecos-sw-2000-10-12

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Merge from eCos master repository on 2000-10-12-08:46:24-BST
author jlarmour
date Thu, 12 Oct 2000 20:31:43 +0000
parents 0ec04793409a
children 0ae0bc38e387
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1 #ifndef CYGONCE_KERNEL_SCHED_HXX
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2 #define CYGONCE_KERNEL_SCHED_HXX
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3
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4 //==========================================================================
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5 //
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6 // sched.hxx
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7 //
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8 // Scheduler class declaration(s)
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9 //
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10 //==========================================================================
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11 //####COPYRIGHTBEGIN####
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12 //
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13 // -------------------------------------------
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14 // The contents of this file are subject to the Red Hat eCos Public License
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15 // Version 1.1 (the "License"); you may not use this file except in
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16 // compliance with the License. You may obtain a copy of the License at
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17 // http://www.redhat.com/
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18 //
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19 // Software distributed under the License is distributed on an "AS IS"
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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21 // License for the specific language governing rights and limitations under
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22 // the License.
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23 //
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24 // The Original Code is eCos - Embedded Configurable Operating System,
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25 // released September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Red Hat.
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28 // Portions created by Red Hat are
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29 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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30 // All Rights Reserved.
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31 // -------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //==========================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): nickg
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38 // Contributors: nickg
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39 // Date: 1997-09-09
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40 // Purpose: Define Scheduler class interfaces
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41 // Description: These class definitions supply the internal API
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42 // used to scheduler threads.
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43 // Usage: #include <cyg/kernel/sched.hxx>
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44 //
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45 //####DESCRIPTIONEND####
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46 //
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47 //==========================================================================
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48
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49 #include <cyg/kernel/ktypes.h>
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50 #include <cyg/infra/cyg_ass.h> // assertion macros
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51
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52
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53 // -------------------------------------------------------------------------
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54 // Miscellaneous types
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55
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56 #ifdef CYGSEM_KERNEL_SCHED_ASR_SUPPORT
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57
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58 typedef void Cyg_ASR( CYG_ADDRWORD data ); // ASR type signature
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59
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60 #endif
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61
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62 // -------------------------------------------------------------------------
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63 // Scheduler base class. This defines stuff that is needed by the
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64 // specific scheduler implementation. Each scheduler comprises three
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65 // classes: Cyg_Scheduler_Base, Cyg_Scheduler_Implementation which
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66 // inherits from it and Cyg_Scheduler which inherits from _it_ in turn.
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67
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68 class Cyg_Scheduler_Base
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69 {
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70 friend class Cyg_HardwareThread;
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71 friend class Cyg_SchedThread;
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72
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73 protected:
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74 // The following variables are implicit in the API, but are
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75 // not publically visible.
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76
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77 static volatile cyg_ucount32 sched_lock // lock counter
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78 CYGBLD_ATTRIB_ASM_ALIAS( cyg_scheduler_sched_lock );
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79
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80 static Cyg_Thread *current_thread; // current running thread
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81
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82 static cyg_bool need_reschedule; // set when schedule needed
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83
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84 static cyg_ucount32 thread_switches; // count of number of thread switches
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85 };
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86
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87 // -------------------------------------------------------------------------
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88 // Include the scheduler implementation header
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89
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90 #include CYGPRI_KERNEL_SCHED_IMPL_HXX
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91
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92 // Do some checking that we have a consistent universe.
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93
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94 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
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95 # ifndef CYGIMP_THREAD_PRIORITY
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96 # error Priority inversion protocols will not work without priorities!!!
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97 # endif
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98 # if CYG_SCHED_UNIQUE_PRIORITIES
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99 # error Priority inversion protocols need non-unique priorities!!!
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100 # endif
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101 #endif
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102
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103 // -------------------------------------------------------------------------
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104 // Scheduler class. This is the public scheduler interface seen by the
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105 // rest of the kernel.
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106
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107 class Cyg_Scheduler
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108 : public Cyg_Scheduler_Implementation
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109 {
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110 friend class Cyg_Thread;
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111
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112 // This function is the actual implementation of the unlock
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113 // function. The unlock() later is an inline shell that deals
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114 // with the common case.
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115
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116 static void unlock_inner(cyg_uint32 new_lock = 0);
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117
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118 public:
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119
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120 CYGDBG_DEFINE_CHECK_THIS
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121
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122 // The following API functions are common to all scheduler
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123 // implementations.
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124
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125 // claim the preemption lock
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126 static void lock();
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127
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128 // release the preemption lock and possibly reschedule
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129 static void unlock();
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130
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131 // release and reclaim the lock atomically, keeping the old
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132 // value on restart
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133 static void reschedule();
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134
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135 // decrement the lock but also look for a reschedule opportunity
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136 static void unlock_reschedule();
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137
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138 // release the preemption lock without rescheduling
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139 static void unlock_simple();
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140
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141 // return a pointer to the current thread
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142 static Cyg_Thread *get_current_thread();
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143
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144 // Return current value of lock
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145 static cyg_ucount32 get_sched_lock();
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146
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147 // Return current number of thread switches
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148 static cyg_ucount32 get_thread_switches();
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149
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150 // Start execution of the scheduler
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151 static void start() __attribute__ ((noreturn));
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152
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153 // The only scheduler instance should be this one...
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154 static Cyg_Scheduler scheduler;
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155
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156 };
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157
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158 // -------------------------------------------------------------------------
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159 // This class encapsulates the scheduling abstractions in a thread.
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160 // Cyg_SchedThread is included as a base class of Cyg_Thread. The actual
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161 // implementation of the abstractions is in Cyg_SchedThread_Implementation
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162 // so this class has little to do.
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163
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164 class Cyg_SchedThread
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165 : public Cyg_SchedThread_Implementation
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166 {
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167 friend class Cyg_ThreadQueue_Implementation;
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168 friend class Cyg_Scheduler_Implementation;
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169 friend class Cyg_Scheduler;
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170
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171 Cyg_ThreadQueue *queue;
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172
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173
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174 public:
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175
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176 Cyg_SchedThread(Cyg_Thread *thread, CYG_ADDRWORD sched_info);
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177
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178 // Return current queue pointer
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179
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180 Cyg_ThreadQueue *get_current_queue();
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181
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182 // Remove this thread from current queue
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183 void remove();
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184
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185 #ifdef CYGSEM_KERNEL_SCHED_ASR_SUPPORT
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186
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187 // ASR support.
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188 // An ASR is an Asynchronous Service Routine. When set pending it
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189 // is called when the thread exits the scheduler. ASRs are mainly
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190 // used by compatibility subsystems, such as POSIX, to implement
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191 // such things as thread cancellation and signal delivery.
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192
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193 private:
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194
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195 volatile cyg_ucount32 asr_inhibit; // If > 0, blocks calls to ASRs
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196
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197 volatile cyg_bool asr_pending; // If true, this thread's ASR should be called.
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198
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199 #ifdef CYGSEM_KERNEL_SCHED_ASR_GLOBAL
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200 static
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201 #endif
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202 Cyg_ASR *asr; // ASR function
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203 #ifdef CYGSEM_KERNEL_SCHED_ASR_DATA_GLOBAL
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204 static
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205 #endif
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206 CYG_ADDRWORD asr_data; // ASR data pointer
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207
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208 // Default ASR function
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209 static void asr_default(CYG_ADDRWORD data);
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210
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211 public:
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212
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213 // Public interface to ASR mechanism
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214
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215 // Set, clear and get inhibit flag.
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216 inline void set_asr_inhibit() { asr_inhibit++; }
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217 inline void clear_asr_inhibit() { asr_inhibit--; }
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218 inline cyg_ucount32 get_asr_inhibit() { return asr_inhibit; }
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219
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220 // Set and get pending flag. The flag is only cleared when the
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221 // ASR is called.
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222 inline void set_asr_pending() { asr_pending = true; }
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223 inline cyg_bool get_asr_pending() { return asr_pending; }
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224
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225 // Set a new ASR, returning the old one.
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226 void set_asr( Cyg_ASR *new_asr, CYG_ADDRWORD new_data,
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227 Cyg_ASR **old_asr, CYG_ADDRWORD *old_data);
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228
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229 // Clear the ASR function back to the default.
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230 void clear_asr();
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231
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232 #else
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233
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234 public:
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235
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236 // Even when we do not have ASRs enabled, we keep these functions
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237 // available. This avoids excessive ifdefs in the rest of the
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238 // kernel code.
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239 inline void set_asr_inhibit() { }
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240 inline void clear_asr_inhibit() { }
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241
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242 #endif
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243
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244 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
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245
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246 private:
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247
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248 // For all priority inversion protocols we need to keep track of how
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249 // many mutexes we have locked, including one which we are waiting to
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250 // lock, because we can inherit priority while sleeping just prior to
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251 // wakeup.
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252
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253 cyg_count32 mutex_count;
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254
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255 protected:
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256 // These are implementation functions that are common to all protocols.
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257
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258 // Inherit the given priority. If thread is non-NULL the priority is
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259 // being inherited from it, otherwise it has come from the mutex.
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260 void set_inherited_priority( cyg_priority pri, Cyg_Thread *thread = 0 );
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261
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262 // Relay the priority of the ex-owner thread or from the queue if it
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263 // has a higher priority than ours.
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264 void relay_inherited_priority( Cyg_Thread *ex_owner, Cyg_ThreadQueue *pqueue);
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265
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266 // Lose priority inheritance
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267 void clear_inherited_priority();
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268
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269 public:
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270 // Count and uncount the number of mutexes held by
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271 // this thread.
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272 void count_mutex() { mutex_count++; };
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273 void uncount_mutex() { mutex_count--; };
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274
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275 #if defined(CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_SIMPLE)
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276
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277 protected:
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278
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279 // The simple priority inversion protocols simply needs
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280 // somewhere to store the base priority of the current thread.
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281
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282 cyg_priority original_priority; // our original priority
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283
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284 cyg_bool priority_inherited; // have we inherited?
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285
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286 #endif
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287
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288 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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289
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290 public:
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291
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292 // Inherit the priority of the provided thread if it
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293 // has higher priority than this.
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294 void inherit_priority( Cyg_Thread *thread);
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295
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296 // Relay the priority of the ex-owner thread or from the queue if it
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297 // has a higher priority than ours.
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298 void relay_priority( Cyg_Thread *ex_owner, Cyg_ThreadQueue *pqueue);
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299
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300 // Lose priority inheritance
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301 void disinherit_priority();
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302
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303 #endif
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304
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305 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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306
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307 public:
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308
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309 // Set the priority of this thread to the given ceiling.
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310 void set_priority_ceiling( cyg_priority pri );
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311
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312 // Clear the ceiling, if necessary.
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313 void clear_priority_ceiling();
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314
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315 #endif
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316
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317 #endif
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318
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319 };
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320
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321 // -------------------------------------------------------------------------
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322 // Simple inline accessor functions
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323
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324 inline Cyg_Thread *Cyg_Scheduler::get_current_thread()
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325 {
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326 return current_thread;
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327 }
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328
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329 // Return current value of lock
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330 inline cyg_ucount32 Cyg_Scheduler::get_sched_lock()
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331 {
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332 return sched_lock;
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333 }
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334
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335 // Return current number of thread switches
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336 inline cyg_ucount32 Cyg_Scheduler::get_thread_switches()
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337 {
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338 return thread_switches;
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339 }
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340
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341 // Return current queue pointer
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342 inline Cyg_ThreadQueue *Cyg_SchedThread::get_current_queue()
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343 {
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344 return queue;
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345 }
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346
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347 // -------------------------------------------------------------------------
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348 #endif // ifndef __SCHED_HXX__
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349 // EOF sched.hxx