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annotate packages/kernel/current/include/thread.hxx @ 182:f62680ef1804

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Merge from eCos master repository on 2001-09-07-06:43:02-BST
author jlarmour
date Wed, 12 Sep 2001 00:59:17 +0000
parents 0d0f03f76f6a
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1 #ifndef CYGONCE_KERNEL_THREAD_HXX
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2 #define CYGONCE_KERNEL_THREAD_HXX
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3
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4 //==========================================================================
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5 //
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6 // thread.hxx
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7 //
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8 // Thread class declarations
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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, 2001 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 Thread class interfaces
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41 // Description: The classes defined here collectively implement the
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42 // internal API used to create, configure and manage threads.
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43 // Usage: #include <cyg/kernel/thread.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 #include <cyg/kernel/sched.hxx>
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52 #include <cyg/kernel/clock.hxx>
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53 #include <cyg/kernel/except.hxx>
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54
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55 #include <cyg/hal/hal_arch.h>
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56
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57 // -------------------------------------------------------------------------
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58 // Miscellaneous types
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59
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60 typedef void cyg_thread_entry(CYG_ADDRWORD data);// Thread entry point function
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61
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62 // -------------------------------------------------------------------------
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63 // Hardware thread interface.
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64 // The implementation of this class is provided by the HAL.
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65
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66 class Cyg_HardwareThread
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67 {
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68 friend class Cyg_Scheduler;
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69
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70 protected:
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71
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72 CYG_ADDRESS stack_base; // pointer to base of stack area
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73
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74 cyg_uint32 stack_size; // size of stack area in bytes
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75
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76 #ifdef CYGFUN_KERNEL_THREADS_STACK_LIMIT
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77 CYG_ADDRESS stack_limit; // movable stack limit
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78 #endif
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79
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80 CYG_ADDRESS stack_ptr; // pointer to saved state on stack
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81
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82 cyg_thread_entry *entry_point; // main entry point (code pointer!)
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83
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84 CYG_ADDRWORD entry_data; // entry point argument
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85
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86 #ifdef CYGDBG_KERNEL_DEBUG_GDB_THREAD_SUPPORT
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87
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88 HAL_SavedRegisters *saved_context; // If non-zero, this points at a more
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89 // interesting context than stack_ptr.
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90 #endif
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91
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92 Cyg_HardwareThread(
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93 cyg_thread_entry *entry_point, // entry point function
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94 CYG_ADDRWORD entry_data, // entry data
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95 cyg_ucount32 stack_size = 0, // stack size, 0 = use default
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96 CYG_ADDRESS stack_base = 0 // stack base, NULL = allocate
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97 );
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98
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99 // Thread entry point. This is where all threads begin execution.
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100 // This routine does a little housekeeping and then call the main
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101 // entry_point specified above.
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102 static void thread_entry(Cyg_Thread *thread);
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103
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104 // Initialize the context of the thread to start execution at thread_entry
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105 void init_context( Cyg_Thread *thread );
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106
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107 // Save current thread's context and load that of the given next thread.
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108 void switch_context(Cyg_HardwareThread *next);
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109
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110 // attach a stack to this thread
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111 void attach_stack(CYG_ADDRESS stack, cyg_uint32 stack_size);
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112
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113 // detach the stack from this thread
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114 CYG_ADDRESS detach_stack();
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115
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116 // Adjust the thread's saved state to call the exception
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117 // handler when next executed.
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118 void prepare_exception (
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119 cyg_exception_handler *exception_handler,
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120 CYG_ADDRWORD exception_data,
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121 cyg_code exception_number,
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122 CYG_ADDRWORD exception_info
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123 );
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124
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125 public:
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126
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127 CYGDBG_DEFINE_CHECK_THIS
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128
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129 // Get and set entry_data.
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130
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131 void set_entry_data( CYG_ADDRWORD data );
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132
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133 CYG_ADDRWORD get_entry_data();
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134
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135 #ifdef CYGDBG_KERNEL_DEBUG_GDB_THREAD_SUPPORT
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136 // Return the current saved state for this thread.
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137 HAL_SavedRegisters *get_saved_context();
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138
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139 // Set the saved context pointer.
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140 void set_saved_context(HAL_SavedRegisters *ctx);
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141 #endif
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142
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143 // get the size/base of this thread's stack
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144 CYG_ADDRESS get_stack_base();
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145
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146 cyg_uint32 get_stack_size();
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147
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148 #ifdef CYGFUN_KERNEL_THREADS_STACK_LIMIT
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149 // Allocate some memory at the lower end of the stack
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150 // by moving the stack limit pointer.
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151
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152 void *increment_stack_limit( cyg_ucount32 size);
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153
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154 CYG_ADDRESS get_stack_limit();
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155 #endif
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156
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157 #ifdef CYGFUN_KERNEL_THREADS_STACK_CHECKING
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158
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159 inline void check_stack(void);
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160
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161 #endif
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162 #ifdef CYGFUN_KERNEL_THREADS_STACK_MEASUREMENT
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163
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164 inline cyg_uint32 measure_stack_usage(void);
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165
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166 #endif
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167 };
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168
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169 // -------------------------------------------------------------------------
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170 // Per-thread timer support class.
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171 // This is only included when required.
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172
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173 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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174
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175 class Cyg_ThreadTimer
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176 : public Cyg_Alarm
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177 {
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178 friend class Cyg_Thread;
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179
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180 // Pointer to current thread
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181 Cyg_Thread *thread;
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182
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183 // Constructor
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184 Cyg_ThreadTimer(
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185 Cyg_Thread *thread
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186 );
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187
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188 // Alarm function
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189 static void alarm( Cyg_Alarm *alarm, CYG_ADDRWORD data);
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190
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191 CYGDBG_DEFINE_CHECK_THIS
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192
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193 };
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194
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195 #endif
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196
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197 // -------------------------------------------------------------------------
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198 // Main Thread class.
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199 // This provides the public API for controlling threads.
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200
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201 class Cyg_Thread
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202 : public Cyg_HardwareThread, // provides hardware abstractions
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203 public Cyg_SchedThread // provides scheduling abstractions
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204 {
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205 friend class Cyg_Scheduler;
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206 friend void deliver_exception( CYG_WORD code, CYG_ADDRWORD data );
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207
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208 // The following definitions are used by all variants of the
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209 // basic thread object.
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210
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211 public:
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212 enum { // Thread state values
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213
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214 RUNNING = 0, // Thread is runnable or running
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215 SLEEPING = 1, // Thread is waiting for something to happen
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216 COUNTSLEEP = 2, // Sleep in counted manner
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217 SUSPENDED = 4, // Suspend count is non-zero
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218 CREATING = 8, // Thread is being created
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219 EXITED = 16, // Thread has exited
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220
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221 // This is the set of bits that must be cleared by a generic
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222 // wake() or release().
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223 SLEEPSET = (SLEEPING | COUNTSLEEP)
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224 };
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225
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226 private:
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227 // Current thread state, a logical OR of the above values.
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228 // Only if this word is zero can the thread execute.
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229 cyg_uint32 state;
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230
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231 // Suspension counter, if > 0, the thread is suspended
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232 cyg_ucount32 suspend_count;
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233
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234 // Wakeup counter, if > 0, sleep will not sleep, just decrement
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235 cyg_ucount32 wakeup_count;
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236
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237 // A word of data used in syncronization object to communicate
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238 // information between sleepers and wakers.
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239 CYG_ADDRWORD wait_info;
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240
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241 // Unique thread id assigned on creation
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242 cyg_uint16 unique_id;
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243
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244 #ifdef CYGPKG_KERNEL_EXCEPTIONS
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245
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246 // If exceptions are supported, define an exception control
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247 // object that will be used to manage and deliver them. If
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248 // exceptions are global there is a single static instance
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249 // of this object, if they are per-thread then there is one
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250 // for each thread.
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251 private:
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252
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253 #ifdef CYGSEM_KERNEL_EXCEPTIONS_GLOBAL
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254 static
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255 #endif
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256 Cyg_Exception_Control exception_control;
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257
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258 public:
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259
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260 static void register_exception(
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261 cyg_code exception_number, // exception number
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262 cyg_exception_handler handler, // handler function
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263 CYG_ADDRWORD data, // data argument
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264 cyg_exception_handler **old_handler, // handler function
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265 CYG_ADDRWORD *old_data // data argument
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266 );
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267
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268 static void deregister_exception(
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269 cyg_code exception_number // exception number
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270 );
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271
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272 void deliver_exception(
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273 cyg_code exception_number, // exception being raised
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274 CYG_ADDRWORD exception_info // exception specific info
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275 );
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276
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277 #endif
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278
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279
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280 public:
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281
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282 CYGDBG_DEFINE_CHECK_THIS
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283
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284 // Constructor, Initialize the thread structure. The thread is
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285 // created in suspended state, and needs to be resumed to execute.
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286 // It is also started at some (configurable) default priority, which
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287 // may need to be changed before calling resume.
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288
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289 Cyg_Thread (
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290 cyg_thread_entry *entry, // entry point function
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291 CYG_ADDRWORD entry_data, // entry data
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292 cyg_ucount32 stack_size = 0, // stack size, 0 = use default
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293 CYG_ADDRESS stack_base = 0 // stack base, NULL = allocate
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294 );
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295
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296 Cyg_Thread (
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297 CYG_ADDRWORD sched_info, // Scheduling parameter(s)
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298 cyg_thread_entry *entry, // entry point function
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299 CYG_ADDRWORD entry_data, // entry data
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300 char *name, // thread name
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301 CYG_ADDRESS stack_base = 0, // stack base, NULL = allocate
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302 cyg_ucount32 stack_size = 0 // stack size, 0 = use default
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303 );
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304
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305 // Re-initialize the thread back to it's initial state.
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306 void Cyg_Thread::reinitialize();
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307
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308 ~Cyg_Thread();
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309
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310 // The following are invoked implicitly on the current thread,
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311 // hence they are static member functions.
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312
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313 static void sleep(); // Put thread to sleep
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314
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315 static void counted_sleep();// Decrement counter or put
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316 // thread to sleep
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317 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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318 static void counted_sleep( cyg_tick_count delay );
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319 // ...for delay ticks
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320 #endif
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321
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322 static void exit(); // Terminate thread
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323
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324 static void yield(); // Yield CPU to another thread
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325
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326 static void rotate_queue( cyg_priority pri );
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327 // Rotate that run queue
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328
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329 void to_queue_head( void );
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330 // Move to the head of its queue
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331 // (not necessarily a scheduler q)
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332
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333 static Cyg_Thread *self(); // Return current thread
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334
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335
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336 // The following are called on threads other than the current one.
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337
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338 void wake(); // Wake this thread from sleep.
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339
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340 void counted_wake(); // Increment counter or wake thread
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341 cyg_uint32 cancel_counted_wake();
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342 // Cancel counted wakeups for this
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343 // thread and return how many were
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344 // pending
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345
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346 void suspend(); // Suspend this thread: increment counter and
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347 // deschedule.
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348
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349 void resume(); // Resume this thread: decrement counter and
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350 // reschedule if counter is zero.
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351
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352 void release(); // Release thread from sleep with BREAK
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353 // wake_reason.
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354
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355 void kill(); // Kill this thread
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356
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357 void force_resume(); // Resume this thread: set counter to zero.
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358
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359 cyg_uint32 get_state(); // Return current thread state.
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360
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361
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362 // Accessor functions to set and get wait_info.
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363
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364 void set_wait_info(CYG_ADDRWORD data);
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365
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366 CYG_ADDRWORD get_wait_info();
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367
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368 // This part of the API is used if we have a clock and want
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369 // per-thread timers for doing delays and timeouts.
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370
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371 // delay the given number of ticks
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372 void delay( cyg_tick_count delay );
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373
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374
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375 enum cyg_reason // sleep/wakeup reason codes
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376 {
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377 NONE, // No recorded reason
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378 WAIT, // Wait with no timeout
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379 DELAY, // Simple time delay
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380 TIMEOUT, // Wait with timeout/timeout expired
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381 BREAK, // forced break out of sleep
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382 DESTRUCT, // wait object destroyed[note]
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383 EXIT, // forced termination
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384 DONE // Wait/delay complete
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385 };
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386 // [note] NOT the thread, some object it was waiting on.
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387 // Thread destruction would first involve EXITing it.
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388
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389 private:
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390
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391 #ifdef CYGFUN_KERNEL_THREADS_TIMER
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392 Cyg_ThreadTimer timer; // per-thread timer
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393 #endif
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394
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395 cyg_reason sleep_reason; // reason for sleeping
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396
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397 cyg_reason wake_reason; // reason for waking
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398
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399 #ifdef CYGIMP_THREAD_PRIORITY
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400
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401 public:
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402
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403 // If the scheduler implements priorities, provide
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404 // functions to set and get it.
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405
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406 void set_priority( cyg_priority pri );
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407
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408 cyg_priority get_priority();
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409
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410 // This returns the current dispatching priority of the
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411 // thread. This may differ from the result of get_priority()
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412 // in the presence of priority inheritance or certain
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413 // scheduling algorithms.
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414 cyg_priority get_current_priority();
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415
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416 #endif
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417
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418 #ifdef CYGVAR_KERNEL_THREADS_DATA
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419
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420 private:
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421 // Array of single word entries for each index.
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422 CYG_ADDRWORD thread_data[CYGNUM_KERNEL_THREADS_DATA_MAX];
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423
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424 // Map of free thread_data indexes. Each bit represents an index
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425 // and is 1 if that index is free, and 0 if it is in use.
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426 static cyg_ucount32 thread_data_map;
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427
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428 public:
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429
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430 typedef cyg_count32 cyg_data_index;
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431
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432 static CYG_ADDRWORD get_data( cyg_data_index index );
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433
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434 static CYG_ADDRWORD *get_data_ptr( cyg_data_index index );
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435
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436 void set_data( cyg_data_index index, CYG_ADDRWORD data );
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437
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438 // returns -1 if no more indexes available
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439 static cyg_data_index new_data_index();
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440
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441 static void free_data_index( cyg_data_index index );
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442
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443 #endif
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444
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445 #ifdef CYGPKG_KERNEL_THREADS_DESTRUCTORS
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446
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447 // thread destructors, called on thread exit.
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448 private:
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449 typedef void (*destructor_fn)(CYG_ADDRWORD);
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450 struct Cyg_Destructor_Entry {
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451 destructor_fn fn;
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452 CYG_ADDRWORD data;
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453 };
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454 #ifndef CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD
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455 static
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456 #endif
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457 Cyg_Destructor_Entry destructors[ CYGNUM_KERNEL_THREADS_DESTRUCTORS ];
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458 public:
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459
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460 // Add and remove destructors. Returns true on success, false on failure.
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461 static cyg_bool add_destructor( destructor_fn fn, CYG_ADDRWORD data );
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462 static cyg_bool rem_destructor( destructor_fn fn, CYG_ADDRWORD data );
0
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463 #endif
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464
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465 #ifdef CYGVAR_KERNEL_THREADS_NAME
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466
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467 private:
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468 // An optional thread name string, for humans to read
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469 char *name;
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470
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471 public:
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472 // function to get the name string
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473 char *get_name();
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474
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475 #endif
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476
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477
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478 #ifdef CYGVAR_KERNEL_THREADS_LIST
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479
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480 // Housekeeping list that tracks all threads
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481 private:
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482 Cyg_Thread *list_next;
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483 static Cyg_Thread *thread_list;
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484
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485 void add_to_list( void );
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486 void remove_from_list( void );
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487 public:
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488
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489 static Cyg_Thread *get_list_head();
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490
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491 Cyg_Thread *get_list_next();
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492
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493 #endif
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494
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495 public:
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496
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497 // Set sleep reason to reason and wake reason to NONE
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498 static void set_sleep_reason( cyg_reason reason = WAIT);
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499
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500 cyg_reason get_sleep_reason();
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501
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502 // Set the wakeup reason to the given value
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503 void set_wake_reason( cyg_reason reason = DONE);
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504
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505 // Get current wake reason
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506 cyg_reason get_wake_reason();
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507
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508 static void set_timer( // Set timeout and sleep reason
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509 cyg_tick_count trigger, // Absolute wakeup time
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510 cyg_reason sleep_reason // reason for sleeping
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511 );
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512
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513 static void clear_timer(); // disable thread timer
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514
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515 // Get a 16 bit unique id for this thread. This is
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516 // used in tracing and instrumentation to identify the
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517 // current thread.
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518
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519 cyg_uint16 get_unique_id();
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520
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521 };
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522
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523 // -------------------------------------------------------------------------
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524 // Thread Queue class.
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525 // This defines the main API for manipulating queues of threads.
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526
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527 class Cyg_ThreadQueue
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528 : public Cyg_ThreadQueue_Implementation
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529 {
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530
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531 public:
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532
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533 CYGDBG_DEFINE_CHECK_THIS
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534
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535 // API used by rest of kernel.
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536
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537 // Add thread to queue
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538 void enqueue(Cyg_Thread *thread);
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539
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540 // return first thread on queue
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541 Cyg_Thread *highpri();
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542
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543 // remove first thread on queue
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544 Cyg_Thread *dequeue();
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545
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546 // remove specified thread from queue
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547 void remove(Cyg_Thread *thread);
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548
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549 // test if queue is empty
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550 cyg_bool empty();
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551
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552 };
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553
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554 // -------------------------------------------------------------------------
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555 // Thread inlines
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556
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557 // Return current thread state.
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558 inline cyg_uint32 Cyg_Thread::get_state()
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559 {
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560 return state;
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561 }
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562
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563 inline void Cyg_Thread::set_wait_info(CYG_ADDRWORD data)
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564 {
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565 wait_info = data;
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566 }
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567
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568 inline CYG_ADDRWORD Cyg_Thread::get_wait_info()
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569 {
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570 return wait_info;
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571 }
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572
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573 // -------------------------------------------------------------------------
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574 #endif // ifndef CYGONCE_KERNEL_THREAD_HXX
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575 // EOF thread.hxx