1 | /* inline/coremutex.inl |
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2 | * |
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3 | * This include file contains all of the inlined routines associated |
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4 | * with the CORE mutexes. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1999. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #ifndef __INLINE_CORE_MUTEX_inl |
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17 | #define __INLINE_CORE_MUTEX_inl |
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18 | |
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19 | /*PAGE |
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20 | * |
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21 | * _CORE_mutex_Is_locked |
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22 | * |
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23 | * DESCRIPTION: |
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24 | * |
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25 | * This routine returns TRUE if the mutex specified is locked and FALSE |
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26 | * otherwise. |
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27 | */ |
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28 | |
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29 | RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_locked( |
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30 | CORE_mutex_Control *the_mutex |
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31 | ) |
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32 | { |
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33 | return the_mutex->lock == CORE_MUTEX_LOCKED; |
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34 | } |
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35 | |
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36 | /*PAGE |
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37 | * |
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38 | * _CORE_mutex_Is_fifo |
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39 | * |
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40 | * DESCRIPTION: |
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41 | * |
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42 | * This routine returns TRUE if the mutex's wait discipline is FIFO and FALSE |
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43 | * otherwise. |
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44 | */ |
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45 | |
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46 | RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_fifo( |
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47 | CORE_mutex_Attributes *the_attribute |
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48 | ) |
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49 | { |
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50 | return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_FIFO; |
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51 | } |
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52 | |
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53 | /*PAGE |
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54 | * |
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55 | * _CORE_mutex_Is_priority |
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56 | * |
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57 | * DESCRIPTION: |
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58 | * |
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59 | * This routine returns TRUE if the mutex's wait discipline is PRIORITY and |
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60 | * FALSE otherwise. |
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61 | */ |
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62 | |
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63 | RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_priority( |
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64 | CORE_mutex_Attributes *the_attribute |
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65 | ) |
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66 | { |
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67 | return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_PRIORITY; |
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68 | } |
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69 | |
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70 | /*PAGE |
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71 | * |
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72 | * _CORE_mutex_Is_inherit_priority |
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73 | * |
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74 | * DESCRIPTION: |
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75 | * |
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76 | * This routine returns TRUE if the mutex's wait discipline is |
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77 | * INHERIT_PRIORITY and FALSE otherwise. |
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78 | */ |
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79 | |
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80 | RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_inherit_priority( |
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81 | CORE_mutex_Attributes *the_attribute |
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82 | ) |
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83 | { |
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84 | return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT; |
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85 | } |
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86 | |
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87 | /*PAGE |
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88 | * |
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89 | * _CORE_mutex_Is_priority_ceiling |
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90 | * |
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91 | * DESCRIPTION: |
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92 | * |
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93 | * This routine returns TRUE if the mutex's wait discipline is |
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94 | * PRIORITY_CEILING and FALSE otherwise. |
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95 | */ |
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96 | |
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97 | RTEMS_INLINE_ROUTINE boolean _CORE_mutex_Is_priority_ceiling( |
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98 | CORE_mutex_Attributes *the_attribute |
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99 | ) |
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100 | { |
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101 | return the_attribute->discipline == CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING; |
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102 | } |
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103 | |
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104 | /*PAGE |
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105 | * |
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106 | * _CORE_mutex_Seize_interrupt_trylock |
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107 | * |
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108 | * DESCRIPTION: |
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109 | * |
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110 | * This routine returns 0 if "trylock" can resolve whether or not the |
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111 | * mutex is immediately obtained or there was an error attempting to |
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112 | * get it. It returns 1 to indicate that the caller cannot obtain |
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113 | * the mutex and will have to block to do so. |
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114 | * |
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115 | * NOTE: There is no MACRO version of this routine. |
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116 | * A body is in coremutexseize.c that is duplicated |
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117 | * from the .inl by hand. |
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118 | */ |
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119 | |
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120 | RTEMS_INLINE_ROUTINE int _CORE_mutex_Seize_interrupt_trylock( |
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121 | CORE_mutex_Control *the_mutex, |
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122 | ISR_Level *level_p |
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123 | ) |
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124 | { |
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125 | Thread_Control *executing; |
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126 | ISR_Level level = *level_p; |
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127 | |
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128 | /* disabled when you get here */ |
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129 | |
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130 | executing = _Thread_Executing; |
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131 | executing->Wait.return_code = CORE_MUTEX_STATUS_SUCCESSFUL; |
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132 | if ( !_CORE_mutex_Is_locked( the_mutex ) ) { |
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133 | the_mutex->lock = CORE_MUTEX_LOCKED; |
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134 | the_mutex->holder = executing; |
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135 | the_mutex->holder_id = executing->Object.id; |
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136 | the_mutex->nest_count = 1; |
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137 | executing->resource_count++; |
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138 | if ( the_mutex->Attributes.discipline != |
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139 | CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING ) { |
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140 | _ISR_Enable( level ); |
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141 | return 0; |
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142 | } |
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143 | /* else must be CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING */ |
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144 | { |
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145 | Priority_Control ceiling; |
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146 | Priority_Control current; |
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147 | |
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148 | ceiling = the_mutex->Attributes.priority_ceiling; |
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149 | current = executing->current_priority; |
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150 | if ( current == ceiling ) { |
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151 | _ISR_Enable( level ); |
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152 | return 0; |
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153 | } |
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154 | if ( current > ceiling ) { |
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155 | _Thread_Disable_dispatch(); |
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156 | _ISR_Enable( level ); |
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157 | _Thread_Change_priority( |
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158 | the_mutex->holder, |
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159 | the_mutex->Attributes.priority_ceiling, |
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160 | FALSE |
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161 | ); |
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162 | _Thread_Enable_dispatch(); |
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163 | return 0; |
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164 | } |
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165 | /* if ( current < ceiling ) */ { |
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166 | executing->Wait.return_code = CORE_MUTEX_STATUS_CEILING_VIOLATED; |
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167 | the_mutex->nest_count = 0; /* undo locking above */ |
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168 | executing->resource_count--; /* undo locking above */ |
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169 | _ISR_Enable( level ); |
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170 | return 0; |
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171 | } |
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172 | } |
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173 | return 0; |
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174 | } |
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175 | |
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176 | if ( _Thread_Is_executing( the_mutex->holder ) ) { |
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177 | switch ( the_mutex->Attributes.lock_nesting_behavior ) { |
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178 | case CORE_MUTEX_NESTING_ACQUIRES: |
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179 | the_mutex->nest_count++; |
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180 | _ISR_Enable( level ); |
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181 | return 0; |
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182 | case CORE_MUTEX_NESTING_IS_ERROR: |
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183 | executing->Wait.return_code = CORE_MUTEX_STATUS_NESTING_NOT_ALLOWED; |
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184 | _ISR_Enable( level ); |
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185 | return 0; |
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186 | case CORE_MUTEX_NESTING_BLOCKS: |
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187 | break; |
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188 | } |
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189 | } |
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190 | |
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191 | return 1; |
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192 | } |
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193 | |
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194 | #endif |
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195 | /* end of include file */ |
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