1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #include <pthread.h> |
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6 | #include <errno.h> |
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7 | |
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8 | #include <rtems/system.h> |
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9 | #include <rtems/score/chain.h> |
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10 | #include <rtems/score/isr.h> |
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11 | #include <rtems/score/thread.h> |
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12 | #include <rtems/score/wkspace.h> |
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13 | #include <rtems/posix/cancel.h> |
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14 | #include <rtems/posix/pthread.h> |
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15 | #include <rtems/posix/threadsup.h> |
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16 | |
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17 | /*PAGE |
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18 | * |
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19 | * POSIX_Thread_cancel_run |
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20 | * |
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21 | */ |
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22 | |
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23 | void POSIX_Thread_cancel_run( |
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24 | Thread_Control *the_thread |
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25 | ) |
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26 | { |
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27 | int old_cancel_state; |
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28 | POSIX_Cancel_Handler_control *handler; |
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29 | Chain_Control *handler_stack; |
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30 | POSIX_API_Thread_Support_Control *thread_support; |
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31 | ISR_Level level; |
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32 | |
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33 | thread_support = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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34 | |
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35 | handler_stack = &thread_support->Cancellation_Handlers; |
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36 | |
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37 | old_cancel_state = thread_support->cancelability_state; |
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38 | |
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39 | thread_support->cancelability_state = PTHREAD_CANCEL_DISABLE; |
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40 | |
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41 | while ( !_Chain_Is_empty( handler_stack ) ) { |
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42 | _ISR_Disable( level ); |
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43 | handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack ); |
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44 | _Chain_Extract_unprotected( &handler->Node ); |
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45 | _ISR_Enable( level ); |
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46 | |
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47 | (*handler->routine)( handler->arg ); |
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48 | |
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49 | _Workspace_Free( handler ); |
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50 | } |
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51 | |
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52 | thread_support->cancelation_requested = 0; |
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53 | |
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54 | thread_support->cancelability_state = old_cancel_state; |
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55 | } |
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56 | |
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57 | /*PAGE |
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58 | * |
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59 | * 18.2.1 Canceling Execution of a Thread, P1003.1c/Draft 10, p. 181 |
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60 | */ |
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61 | |
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62 | int pthread_cancel( |
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63 | pthread_t thread |
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64 | ) |
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65 | { |
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66 | Thread_Control *the_thread; |
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67 | POSIX_API_Thread_Support_Control *thread_support; |
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68 | Objects_Locations location; |
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69 | |
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70 | the_thread = _POSIX_Threads_Get( &thread, &location ); |
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71 | switch ( location ) { |
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72 | case OBJECTS_ERROR: |
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73 | return EINVAL; |
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74 | case OBJECTS_REMOTE: |
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75 | return POSIX_MP_NOT_IMPLEMENTED(); |
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76 | case OBJECTS_LOCAL: |
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77 | thread_support = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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78 | |
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79 | thread_support->cancelation_requested = 1; |
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80 | |
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81 | _Thread_Enable_dispatch(); |
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82 | return 0; |
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83 | } |
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84 | |
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85 | return POSIX_BOTTOM_REACHED(); |
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86 | } |
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87 | |
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88 | /*PAGE |
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89 | * |
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90 | * 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183 |
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91 | */ |
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92 | |
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93 | int pthread_setcancelstate( |
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94 | int state, |
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95 | int *oldstate |
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96 | ) |
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97 | { |
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98 | POSIX_API_Thread_Support_Control *thread_support; |
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99 | |
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100 | if ( !oldstate ) |
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101 | return EINVAL; |
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102 | |
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103 | if ( state != PTHREAD_CANCEL_ENABLE && state != PTHREAD_CANCEL_DISABLE ) |
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104 | return EINVAL; |
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105 | |
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106 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
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107 | |
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108 | *oldstate = thread_support->cancelability_state; |
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109 | thread_support->cancelability_state = state; |
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110 | |
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111 | if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE && |
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112 | thread_support->cancelability_type == PTHREAD_CANCEL_ASYNCHRONOUS && |
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113 | thread_support->cancelation_requested ) |
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114 | POSIX_Thread_cancel_run( _Thread_Executing ); |
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115 | |
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116 | return 0; |
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117 | } |
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118 | |
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119 | /*PAGE |
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120 | * |
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121 | * 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183 |
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122 | */ |
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123 | |
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124 | int pthread_setcanceltype( |
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125 | int type, |
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126 | int *oldtype |
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127 | ) |
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128 | { |
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129 | POSIX_API_Thread_Support_Control *thread_support; |
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130 | |
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131 | if ( !oldtype ) |
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132 | return EINVAL; |
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133 | |
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134 | if ( type != PTHREAD_CANCEL_DEFERRED && type != PTHREAD_CANCEL_ASYNCHRONOUS ) |
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135 | return EINVAL; |
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136 | |
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137 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
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138 | |
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139 | *oldtype = thread_support->cancelability_type; |
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140 | thread_support->cancelability_type = type; |
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141 | |
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142 | if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE && |
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143 | thread_support->cancelability_type == PTHREAD_CANCEL_ASYNCHRONOUS && |
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144 | thread_support->cancelation_requested ) |
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145 | POSIX_Thread_cancel_run( _Thread_Executing ); |
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146 | |
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147 | return 0; |
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148 | } |
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149 | |
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150 | /*PAGE |
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151 | * |
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152 | * 18.2.2 Setting Cancelability State, P1003.1c/Draft 10, p. 183 |
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153 | */ |
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154 | |
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155 | void pthread_testcancel( void ) |
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156 | { |
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157 | POSIX_API_Thread_Support_Control *thread_support; |
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158 | |
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159 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
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160 | |
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161 | if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE && |
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162 | thread_support->cancelation_requested ) |
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163 | POSIX_Thread_cancel_run( _Thread_Executing ); |
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164 | } |
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165 | |
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166 | /*PAGE |
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167 | * |
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168 | * 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184 |
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169 | */ |
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170 | |
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171 | void pthread_cleanup_push( |
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172 | void (*routine)( void * ), |
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173 | void *arg |
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174 | ) |
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175 | { |
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176 | POSIX_Cancel_Handler_control *handler; |
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177 | Chain_Control *handler_stack; |
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178 | POSIX_API_Thread_Support_Control *thread_support; |
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179 | |
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180 | if ( !routine ) |
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181 | return; /* XXX what to do really? */ |
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182 | |
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183 | handler = _Workspace_Allocate( sizeof( POSIX_Cancel_Handler_control ) ); |
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184 | |
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185 | if ( !handler ) |
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186 | return; /* XXX what to do really? */ |
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187 | |
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188 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
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189 | |
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190 | handler_stack = &thread_support->Cancellation_Handlers; |
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191 | |
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192 | handler->routine = routine; |
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193 | handler->arg = arg; |
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194 | |
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195 | _Chain_Append( handler_stack, &handler->Node ); |
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196 | } |
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197 | |
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198 | /*PAGE |
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199 | * |
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200 | * 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184 |
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201 | */ |
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202 | |
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203 | void pthread_cleanup_pop( |
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204 | int execute |
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205 | ) |
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206 | { |
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207 | POSIX_Cancel_Handler_control *handler; |
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208 | Chain_Control *handler_stack; |
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209 | POSIX_API_Thread_Support_Control *thread_support; |
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210 | ISR_Level level; |
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211 | |
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212 | thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
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213 | |
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214 | handler_stack = &thread_support->Cancellation_Handlers; |
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215 | |
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216 | if ( _Chain_Is_empty( handler_stack ) ) |
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217 | return; |
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218 | |
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219 | _ISR_Disable( level ); |
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220 | handler = (POSIX_Cancel_Handler_control *) _Chain_Tail( handler_stack ); |
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221 | _Chain_Extract_unprotected( &handler->Node ); |
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222 | _ISR_Enable( level ); |
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223 | |
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224 | if ( execute ) |
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225 | (*handler->routine)( handler->arg ); |
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226 | |
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227 | _Workspace_Free( handler ); |
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228 | } |
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