1 | /** |
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2 | * @file rtems/score/thread.inl |
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3 | * |
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4 | * This file contains the macro implementation of the inlined |
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5 | * routines from the Thread handler. |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2008. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | * |
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16 | * $Id$ |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_SCORE_THREAD_H |
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20 | # error "Never use <rtems/score/thread.inl> directly; include <rtems/score/thread.h> instead." |
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21 | #endif |
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22 | |
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23 | #ifndef _RTEMS_SCORE_THREAD_INL |
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24 | #define _RTEMS_SCORE_THREAD_INL |
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25 | |
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26 | #include <rtems/score/sysstate.h> |
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27 | #include <rtems/score/context.h> |
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28 | |
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29 | /** |
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30 | * @addtogroup ScoreThread |
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31 | * @{ |
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32 | */ |
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33 | |
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34 | /** |
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35 | * This routine returns true if thread dispatch indicates |
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36 | * that we are in a critical section. |
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37 | */ |
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38 | RTEMS_INLINE_ROUTINE bool _Thread_Dispatch_in_critical_section(void) |
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39 | { |
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40 | if ( _Thread_Dispatch_disable_level == 0 ) |
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41 | return false; |
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42 | |
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43 | return true; |
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44 | } |
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45 | |
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46 | /** |
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47 | * This routine returns value of the the thread dispatch level. |
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48 | */ |
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49 | RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_get_disable_level(void) |
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50 | { |
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51 | return _Thread_Dispatch_disable_level; |
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52 | } |
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53 | |
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54 | /** |
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55 | * This routine sets thread dispatch level to the |
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56 | * value passed in. |
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57 | */ |
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58 | RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_set_disable_level(uint32_t value) |
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59 | { |
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60 | _Thread_Dispatch_disable_level = value; |
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61 | return value; |
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62 | } |
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63 | |
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64 | /** |
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65 | * This rountine increments the thread dispatch level |
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66 | */ |
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67 | RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_increment_disable_level(void) |
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68 | { |
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69 | _Thread_Dispatch_disable_level++; |
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70 | return _Thread_Dispatch_disable_level; |
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71 | } |
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72 | |
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73 | /** |
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74 | * This routine decrements the thread dispatch level. |
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75 | */ |
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76 | RTEMS_INLINE_ROUTINE uint32_t _Thread_Dispatch_decrement_disable_level(void) |
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77 | { |
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78 | _Thread_Dispatch_disable_level--; |
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79 | return _Thread_Dispatch_disable_level; |
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80 | } |
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81 | |
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82 | /** |
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83 | * This routine initializes the thread dispatching subsystem. |
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84 | */ |
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85 | |
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86 | RTEMS_INLINE_ROUTINE void _Thread_Dispatch_initialization( void ) |
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87 | { |
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88 | _Thread_Dispatch_set_disable_level( 1 ); |
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89 | } |
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90 | |
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91 | |
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92 | /** |
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93 | * This routine halts multitasking and returns control to |
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94 | * the "thread" (i.e. the BSP) which initially invoked the |
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95 | * routine which initialized the system. |
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96 | */ |
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97 | |
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98 | RTEMS_INLINE_ROUTINE void _Thread_Stop_multitasking( void ) |
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99 | { |
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100 | /* |
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101 | * This may look a bit of an odd but _Context_Restart_self is just |
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102 | * a very careful restore of a specific context which ensures that |
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103 | * if we were running within the same context, it would work. |
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104 | * |
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105 | * And we will not return to this thread, so there is no point of |
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106 | * saving the context. |
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107 | */ |
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108 | _Context_Restart_self( &_Thread_BSP_context ); |
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109 | |
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110 | /*************************************************************** |
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111 | *************************************************************** |
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112 | * SYSTEM SHUTS DOWN!!! WE DO NOT RETURN TO THIS POINT!!! * |
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113 | *************************************************************** |
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114 | *************************************************************** |
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115 | */ |
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116 | } |
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117 | |
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118 | /** |
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119 | * This function returns true if the_thread is the currently executing |
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120 | * thread, and false otherwise. |
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121 | */ |
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122 | |
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123 | RTEMS_INLINE_ROUTINE bool _Thread_Is_executing ( |
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124 | const Thread_Control *the_thread |
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125 | ) |
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126 | { |
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127 | return ( the_thread == _Thread_Executing ); |
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128 | } |
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129 | |
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130 | /** |
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131 | * This function returns true if the_thread is the heir |
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132 | * thread, and false otherwise. |
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133 | */ |
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134 | |
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135 | RTEMS_INLINE_ROUTINE bool _Thread_Is_heir ( |
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136 | const Thread_Control *the_thread |
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137 | ) |
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138 | { |
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139 | return ( the_thread == _Thread_Heir ); |
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140 | } |
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141 | |
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142 | /** |
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143 | * This function returns true if the currently executing thread |
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144 | * is also the heir thread, and false otherwise. |
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145 | */ |
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146 | |
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147 | RTEMS_INLINE_ROUTINE bool _Thread_Is_executing_also_the_heir( void ) |
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148 | { |
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149 | return ( _Thread_Executing == _Thread_Heir ); |
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150 | } |
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151 | |
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152 | /** |
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153 | * This routine clears any blocking state for the_thread. It performs |
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154 | * any necessary scheduling operations including the selection of |
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155 | * a new heir thread. |
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156 | */ |
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157 | |
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158 | RTEMS_INLINE_ROUTINE void _Thread_Unblock ( |
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159 | Thread_Control *the_thread |
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160 | ) |
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161 | { |
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162 | _Thread_Clear_state( the_thread, STATES_BLOCKED ); |
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163 | } |
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164 | |
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165 | /** |
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166 | * This routine resets the current context of the calling thread |
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167 | * to that of its initial state. |
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168 | */ |
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169 | |
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170 | RTEMS_INLINE_ROUTINE void _Thread_Restart_self( void ) |
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171 | { |
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172 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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173 | if ( _Thread_Executing->fp_context != NULL ) |
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174 | _Context_Restore_fp( &_Thread_Executing->fp_context ); |
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175 | #endif |
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176 | |
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177 | _CPU_Context_Restart_self( &_Thread_Executing->Registers ); |
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178 | } |
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179 | |
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180 | /** |
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181 | * This function returns true if the floating point context of |
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182 | * the_thread is currently loaded in the floating point unit, and |
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183 | * false otherwise. |
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184 | */ |
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185 | |
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186 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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187 | RTEMS_INLINE_ROUTINE bool _Thread_Is_allocated_fp ( |
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188 | const Thread_Control *the_thread |
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189 | ) |
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190 | { |
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191 | return ( the_thread == _Thread_Allocated_fp ); |
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192 | } |
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193 | #endif |
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194 | |
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195 | /** |
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196 | * This routine is invoked when the currently loaded floating |
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197 | * point context is now longer associated with an active thread. |
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198 | */ |
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199 | |
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200 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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201 | RTEMS_INLINE_ROUTINE void _Thread_Deallocate_fp( void ) |
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202 | { |
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203 | _Thread_Allocated_fp = NULL; |
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204 | } |
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205 | #endif |
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206 | |
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207 | /** |
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208 | * This routine prevents dispatching. |
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209 | */ |
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210 | |
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211 | #if defined ( __THREAD_DO_NOT_INLINE_DISABLE_DISPATCH__ ) |
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212 | void _Thread_Disable_dispatch( void ); |
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213 | #else |
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214 | RTEMS_INLINE_ROUTINE void _Thread_Disable_dispatch( void ) |
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215 | { |
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216 | _Thread_Dispatch_increment_disable_level(); |
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217 | RTEMS_COMPILER_MEMORY_BARRIER(); |
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218 | } |
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219 | #endif |
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220 | |
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221 | /** |
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222 | * This routine allows dispatching to occur again. If this is |
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223 | * the outer most dispatching critical section, then a dispatching |
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224 | * operation will be performed and, if necessary, control of the |
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225 | * processor will be transferred to the heir thread. |
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226 | */ |
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227 | |
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228 | #if defined ( __THREAD_DO_NOT_INLINE_ENABLE_DISPATCH__ ) |
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229 | void _Thread_Enable_dispatch( void ); |
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230 | #else |
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231 | /* inlining of enable dispatching must be true */ |
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232 | RTEMS_INLINE_ROUTINE void _Thread_Enable_dispatch( void ) |
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233 | { |
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234 | RTEMS_COMPILER_MEMORY_BARRIER(); |
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235 | if ( _Thread_Dispatch_decrement_disable_level() == 0 ) |
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236 | _Thread_Dispatch(); |
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237 | } |
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238 | #endif |
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239 | |
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240 | /** |
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241 | * This routine allows dispatching to occur again. However, |
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242 | * no dispatching operation is performed even if this is the outer |
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243 | * most dispatching critical section. |
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244 | */ |
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245 | |
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246 | RTEMS_INLINE_ROUTINE void _Thread_Unnest_dispatch( void ) |
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247 | { |
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248 | RTEMS_COMPILER_MEMORY_BARRIER(); |
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249 | _Thread_Dispatch_decrement_disable_level(); |
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250 | } |
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251 | |
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252 | /** |
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253 | * This function returns true if dispatching is disabled, and false |
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254 | * otherwise. |
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255 | */ |
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256 | |
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257 | RTEMS_INLINE_ROUTINE bool _Thread_Is_dispatching_enabled( void ) |
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258 | { |
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259 | return ( _Thread_Dispatch_in_critical_section() == false ); |
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260 | } |
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261 | |
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262 | /** |
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263 | * This function returns true if dispatching is disabled, and false |
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264 | * otherwise. |
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265 | */ |
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266 | |
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267 | RTEMS_INLINE_ROUTINE bool _Thread_Is_context_switch_necessary( void ) |
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268 | { |
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269 | return ( _Thread_Dispatch_necessary ); |
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270 | } |
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271 | |
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272 | /** |
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273 | * This function returns true if the_thread is NULL and false otherwise. |
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274 | */ |
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275 | |
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276 | RTEMS_INLINE_ROUTINE bool _Thread_Is_null ( |
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277 | const Thread_Control *the_thread |
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278 | ) |
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279 | { |
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280 | return ( the_thread == NULL ); |
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281 | } |
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282 | |
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283 | /** @brief _Thread_Is_proxy_blocking |
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284 | * |
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285 | * status which indicates that a proxy is blocking, and false otherwise. |
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286 | */ |
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287 | RTEMS_INLINE_ROUTINE bool _Thread_Is_proxy_blocking ( |
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288 | uint32_t code |
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289 | ) |
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290 | { |
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291 | return (code == THREAD_STATUS_PROXY_BLOCKING); |
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292 | } |
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293 | |
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294 | /** |
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295 | * This routine allocates an internal thread. |
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296 | */ |
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297 | |
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298 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_Internal_allocate( void ) |
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299 | { |
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300 | return (Thread_Control *) _Objects_Allocate( &_Thread_Internal_information ); |
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301 | } |
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302 | |
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303 | /** |
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304 | * This routine frees an internal thread. |
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305 | */ |
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306 | |
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307 | RTEMS_INLINE_ROUTINE void _Thread_Internal_free ( |
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308 | Thread_Control *the_task |
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309 | ) |
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310 | { |
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311 | _Objects_Free( &_Thread_Internal_information, &the_task->Object ); |
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312 | } |
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313 | |
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314 | /** |
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315 | * This routine returns the C library re-enterant pointer. |
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316 | */ |
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317 | |
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318 | RTEMS_INLINE_ROUTINE struct _reent **_Thread_Get_libc_reent( void ) |
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319 | { |
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320 | return _Thread_libc_reent; |
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321 | } |
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322 | |
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323 | /** |
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324 | * This routine set the C library re-enterant pointer. |
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325 | */ |
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326 | |
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327 | RTEMS_INLINE_ROUTINE void _Thread_Set_libc_reent ( |
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328 | struct _reent **libc_reent |
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329 | ) |
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330 | { |
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331 | _Thread_libc_reent = libc_reent; |
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332 | } |
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333 | |
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334 | /** |
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335 | * This routine evaluates the current scheduling information for the |
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336 | * system and determines if a context switch is required. This |
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337 | * is usually called after changing an execution mode such as preemptability |
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338 | * for a thread. |
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339 | * |
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340 | * @param[in] are_signals_pending specifies whether or not the API |
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341 | * level signals are pending and a dispatch is needed. |
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342 | */ |
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343 | RTEMS_INLINE_ROUTINE bool _Thread_Evaluate_is_dispatch_needed( |
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344 | bool are_signals_pending |
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345 | ) |
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346 | { |
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347 | Thread_Control *executing; |
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348 | |
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349 | executing = _Thread_Executing; |
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350 | |
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351 | if ( are_signals_pending || |
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352 | (!_Thread_Is_heir( executing ) && executing->is_preemptible) ) { |
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353 | _Thread_Dispatch_necessary = true; |
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354 | return true; |
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355 | } |
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356 | |
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357 | return false; |
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358 | } |
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359 | |
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360 | /**@}*/ |
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361 | |
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362 | #endif |
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363 | /* end of include file */ |
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