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/object.h> |
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10 | #include <rtems/score/states.h> |
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11 | #include <rtems/score/watchdog.h> |
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12 | #include <rtems/posix/cond.h> |
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13 | #include <rtems/posix/time.h> |
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14 | #include <rtems/posix/mutex.h> |
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15 | |
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16 | /* |
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17 | * TEMPORARY |
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18 | */ |
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19 | |
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20 | void _POSIX_Condition_variables_MP_Send_process_packet ( |
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21 | POSIX_Condition_variables_MP_Remote_operations operation, |
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22 | Objects_Id condition_variables_id, |
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23 | Objects_Name name, |
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24 | Objects_Id proxy_id |
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25 | ) |
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26 | { |
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27 | (void) POSIX_MP_NOT_IMPLEMENTED(); |
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28 | } |
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29 | |
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30 | void _POSIX_Condition_variables_MP_Send_extract_proxy( |
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31 | Thread_Control *the_thread |
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32 | ) |
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33 | { |
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34 | (void) POSIX_MP_NOT_IMPLEMENTED(); |
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35 | } |
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36 | |
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37 | /* |
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38 | * END OF TEMPORARY |
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39 | */ |
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40 | |
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41 | /*PAGE |
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42 | * |
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43 | * The default condition variable attributes structure. |
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44 | */ |
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45 | |
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46 | const pthread_condattr_t _POSIX_Condition_variables_Default_attributes = { |
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47 | TRUE, /* is_initialized */ |
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48 | PTHREAD_PROCESS_PRIVATE /* process_shared */ |
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49 | }; |
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50 | |
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51 | /*PAGE |
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52 | * |
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53 | * _POSIX_Condition_variables_Manager_initialization |
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54 | * |
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55 | * This routine initializes all condition variable manager related data |
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56 | * structures. |
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57 | * |
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58 | * Input parameters: |
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59 | * maximum_condition_variables - maximum configured condition_variables |
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60 | * |
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61 | * Output parameters: NONE |
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62 | */ |
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63 | |
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64 | void _POSIX_Condition_variables_Manager_initialization( |
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65 | unsigned32 maximum_condition_variables |
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66 | ) |
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67 | { |
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68 | _Objects_Initialize_information( |
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69 | &_POSIX_Condition_variables_Information, |
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70 | OBJECTS_POSIX_CONDITION_VARIABLES, |
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71 | TRUE, |
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72 | maximum_condition_variables, |
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73 | sizeof( POSIX_Condition_variables_Control ), |
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74 | FALSE, |
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75 | 0, |
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76 | FALSE |
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77 | ); |
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78 | } |
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79 | |
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80 | /*PAGE |
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81 | * |
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82 | * 11.4.1 Condition Variable Initialization Attributes, |
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83 | * P1003.1c/Draft 10, p. 96 |
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84 | */ |
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85 | |
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86 | int pthread_condattr_init( |
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87 | pthread_condattr_t *attr |
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88 | ) |
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89 | { |
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90 | if ( !attr ) |
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91 | return EINVAL; |
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92 | |
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93 | *attr = _POSIX_Condition_variables_Default_attributes; |
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94 | return 0; |
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95 | } |
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96 | |
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97 | /*PAGE |
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98 | * |
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99 | * 11.4.1 Condition Variable Initialization Attributes, |
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100 | * P1003.1c/Draft 10, p. 96 |
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101 | */ |
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102 | |
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103 | int pthread_condattr_destroy( |
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104 | pthread_condattr_t *attr |
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105 | ) |
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106 | { |
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107 | if ( !attr || attr->is_initialized == FALSE ) |
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108 | return EINVAL; |
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109 | |
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110 | attr->is_initialized = FALSE; |
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111 | return 0; |
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112 | } |
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113 | |
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114 | /*PAGE |
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115 | * |
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116 | * 11.4.1 Condition Variable Initialization Attributes, |
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117 | * P1003.1c/Draft 10, p. 96 |
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118 | */ |
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119 | |
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120 | int pthread_condattr_getpshared( |
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121 | const pthread_condattr_t *attr, |
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122 | int *pshared |
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123 | ) |
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124 | { |
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125 | if ( !attr ) |
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126 | return EINVAL; |
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127 | |
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128 | *pshared = attr->process_shared; |
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129 | return 0; |
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130 | } |
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131 | |
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132 | /*PAGE |
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133 | * |
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134 | * 11.4.1 Condition Variable Initialization Attributes, |
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135 | * P1003.1c/Draft 10, p. 96 |
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136 | */ |
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137 | |
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138 | int pthread_condattr_setpshared( |
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139 | pthread_condattr_t *attr, |
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140 | int pshared |
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141 | ) |
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142 | { |
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143 | if ( !attr ) |
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144 | return EINVAL; |
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145 | |
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146 | switch ( pshared ) { |
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147 | case PTHREAD_PROCESS_SHARED: |
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148 | case PTHREAD_PROCESS_PRIVATE: |
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149 | attr->process_shared = pshared; |
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150 | return 0; |
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151 | |
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152 | default: |
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153 | return EINVAL; |
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154 | } |
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155 | } |
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156 | |
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157 | /*PAGE |
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158 | * |
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159 | * 11.4.2 Initializing and Destroying a Condition Variable, |
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160 | * P1003.1c/Draft 10, p. 87 |
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161 | */ |
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162 | |
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163 | int pthread_cond_init( |
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164 | pthread_cond_t *cond, |
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165 | const pthread_condattr_t *attr |
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166 | ) |
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167 | { |
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168 | POSIX_Condition_variables_Control *the_cond; |
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169 | const pthread_condattr_t *the_attr; |
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170 | |
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171 | if ( attr ) the_attr = attr; |
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172 | else the_attr = &_POSIX_Condition_variables_Default_attributes; |
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173 | |
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174 | /* |
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175 | * XXX: Be careful about attributes when global!!! |
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176 | */ |
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177 | |
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178 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
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179 | return POSIX_MP_NOT_IMPLEMENTED(); |
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180 | |
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181 | if ( !the_attr->is_initialized ) |
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182 | return EINVAL; |
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183 | |
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184 | _Thread_Disable_dispatch(); |
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185 | |
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186 | the_cond = _POSIX_Condition_variables_Allocate(); |
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187 | |
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188 | if ( !the_cond ) { |
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189 | _Thread_Enable_dispatch(); |
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190 | return ENOMEM; |
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191 | } |
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192 | |
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193 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED && |
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194 | !( _Objects_MP_Allocate_and_open( &_POSIX_Condition_variables_Information, |
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195 | 0, the_cond->Object.id, FALSE ) ) ) { |
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196 | _POSIX_Condition_variables_Free( the_cond ); |
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197 | _Thread_Enable_dispatch(); |
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198 | return EAGAIN; |
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199 | } |
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200 | |
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201 | the_cond->process_shared = the_attr->process_shared; |
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202 | |
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203 | the_cond->Mutex = POSIX_CONDITION_VARIABLES_NO_MUTEX; |
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204 | |
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205 | /* XXX some more initialization might need to go here */ |
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206 | _Thread_queue_Initialize( |
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207 | &the_cond->Wait_queue, |
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208 | OBJECTS_POSIX_CONDITION_VARIABLES, |
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209 | THREAD_QUEUE_DISCIPLINE_FIFO, |
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210 | STATES_WAITING_FOR_CONDITION_VARIABLE, |
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211 | _POSIX_Condition_variables_MP_Send_extract_proxy, |
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212 | ETIMEDOUT |
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213 | ); |
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214 | |
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215 | _Objects_Open( |
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216 | &_POSIX_Condition_variables_Information, |
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217 | &the_cond->Object, |
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218 | 0 |
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219 | ); |
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220 | |
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221 | *cond = the_cond->Object.id; |
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222 | |
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223 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
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224 | _POSIX_Condition_variables_MP_Send_process_packet( |
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225 | POSIX_CONDITION_VARIABLES_MP_ANNOUNCE_CREATE, |
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226 | the_cond->Object.id, |
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227 | 0, /* Name not used */ |
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228 | 0 /* Not used */ |
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229 | ); |
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230 | |
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231 | _Thread_Enable_dispatch(); |
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232 | |
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233 | return 0; |
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234 | } |
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235 | |
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236 | /*PAGE |
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237 | * |
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238 | * 11.4.2 Initializing and Destroying a Condition Variable, |
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239 | * P1003.1c/Draft 10, p. 87 |
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240 | */ |
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241 | |
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242 | int pthread_cond_destroy( |
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243 | pthread_cond_t *cond |
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244 | ) |
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245 | { |
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246 | register POSIX_Condition_variables_Control *the_cond; |
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247 | Objects_Locations location; |
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248 | |
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249 | the_cond = _POSIX_Condition_variables_Get( cond, &location ); |
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250 | switch ( location ) { |
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251 | case OBJECTS_ERROR: |
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252 | return EINVAL; |
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253 | case OBJECTS_REMOTE: |
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254 | _Thread_Dispatch(); |
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255 | return POSIX_MP_NOT_IMPLEMENTED(); |
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256 | return EINVAL; |
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257 | case OBJECTS_LOCAL: |
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258 | |
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259 | if ( _Thread_queue_First( &the_cond->Wait_queue ) ) { |
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260 | _Thread_Enable_dispatch(); |
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261 | return EBUSY; |
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262 | } |
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263 | |
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264 | _Objects_Close( |
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265 | &_POSIX_Condition_variables_Information, |
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266 | &the_cond->Object |
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267 | ); |
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268 | |
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269 | _POSIX_Condition_variables_Free( the_cond ); |
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270 | |
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271 | if ( the_cond->process_shared == PTHREAD_PROCESS_SHARED ) { |
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272 | |
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273 | _Objects_MP_Close( |
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274 | &_POSIX_Condition_variables_Information, |
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275 | the_cond->Object.id |
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276 | ); |
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277 | |
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278 | _POSIX_Condition_variables_MP_Send_process_packet( |
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279 | POSIX_CONDITION_VARIABLES_MP_ANNOUNCE_DELETE, |
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280 | the_cond->Object.id, |
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281 | 0, /* Not used */ |
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282 | 0 /* Not used */ |
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283 | ); |
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284 | } |
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285 | _Thread_Enable_dispatch(); |
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286 | return 0; |
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287 | } |
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288 | return POSIX_BOTTOM_REACHED(); |
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289 | } |
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290 | |
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291 | /*PAGE |
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292 | * |
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293 | * _POSIX_Condition_variables_Signal_support |
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294 | * |
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295 | * A support routine which implements guts of the broadcast and single task |
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296 | * wake up version of the "signal" operation. |
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297 | */ |
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298 | |
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299 | int _POSIX_Condition_variables_Signal_support( |
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300 | pthread_cond_t *cond, |
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301 | boolean is_broadcast |
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302 | ) |
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303 | { |
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304 | register POSIX_Condition_variables_Control *the_cond; |
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305 | Objects_Locations location; |
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306 | Thread_Control *the_thread; |
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307 | |
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308 | the_cond = _POSIX_Condition_variables_Get( cond, &location ); |
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309 | switch ( location ) { |
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310 | case OBJECTS_ERROR: |
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311 | return EINVAL; |
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312 | case OBJECTS_REMOTE: |
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313 | _Thread_Dispatch(); |
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314 | return POSIX_MP_NOT_IMPLEMENTED(); |
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315 | return EINVAL; |
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316 | case OBJECTS_LOCAL: |
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317 | |
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318 | do { |
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319 | the_thread = _Thread_queue_Dequeue( &the_cond->Wait_queue ); |
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320 | if ( !the_thread ) |
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321 | the_cond->Mutex = POSIX_CONDITION_VARIABLES_NO_MUTEX; |
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322 | } while ( is_broadcast && the_thread ); |
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323 | |
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324 | _Thread_Enable_dispatch(); |
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325 | |
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326 | return 0; |
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327 | } |
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328 | return POSIX_BOTTOM_REACHED(); |
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329 | } |
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330 | |
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331 | /*PAGE |
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332 | * |
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333 | * 11.4.3 Broadcasting and Signaling a Condition, P1003.1c/Draft 10, p. 101 |
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334 | */ |
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335 | |
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336 | int pthread_cond_signal( |
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337 | pthread_cond_t *cond |
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338 | ) |
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339 | { |
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340 | return _POSIX_Condition_variables_Signal_support( cond, FALSE ); |
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341 | } |
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342 | |
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343 | /*PAGE |
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344 | * |
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345 | * 11.4.3 Broadcasting and Signaling a Condition, P1003.1c/Draft 10, p. 101 |
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346 | */ |
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347 | |
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348 | int pthread_cond_broadcast( |
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349 | pthread_cond_t *cond |
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350 | ) |
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351 | { |
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352 | return _POSIX_Condition_variables_Signal_support( cond, TRUE ); |
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353 | } |
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354 | |
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355 | /*PAGE |
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356 | * |
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357 | * _POSIX_Condition_variables_Wait_support |
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358 | * |
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359 | * A support routine which implements guts of the blocking, non-blocking, and |
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360 | * timed wait version of condition variable wait routines. |
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361 | */ |
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362 | |
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363 | int _POSIX_Condition_variables_Wait_support( |
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364 | pthread_cond_t *cond, |
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365 | pthread_mutex_t *mutex, |
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366 | Watchdog_Interval timeout |
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367 | ) |
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368 | { |
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369 | register POSIX_Condition_variables_Control *the_cond; |
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370 | Objects_Locations location; |
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371 | int status; |
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372 | |
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373 | the_cond = _POSIX_Condition_variables_Get( cond, &location ); |
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374 | switch ( location ) { |
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375 | case OBJECTS_ERROR: |
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376 | return EINVAL; |
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377 | case OBJECTS_REMOTE: |
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378 | _Thread_Dispatch(); |
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379 | return POSIX_MP_NOT_IMPLEMENTED(); |
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380 | return EINVAL; |
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381 | case OBJECTS_LOCAL: |
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382 | |
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383 | if ( the_cond->Mutex && ( the_cond->Mutex != *mutex ) ) { |
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384 | _Thread_Enable_dispatch(); |
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385 | return EINVAL; |
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386 | } |
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387 | |
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388 | the_cond->Mutex = *mutex; |
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389 | |
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390 | status = pthread_mutex_unlock( mutex ); |
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391 | if ( status ) { |
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392 | _Thread_Enable_dispatch(); |
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393 | return EINVAL; |
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394 | } |
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395 | |
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396 | _Thread_queue_Enter_critical_section( &the_cond->Wait_queue ); |
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397 | _Thread_Executing->Wait.return_code = 0; |
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398 | _Thread_Executing->Wait.queue = &the_cond->Wait_queue; |
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399 | _Thread_Executing->Wait.id = *cond; |
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400 | |
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401 | _Thread_queue_Enqueue( &the_cond->Wait_queue, timeout ); |
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402 | |
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403 | _Thread_Enable_dispatch(); |
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404 | |
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405 | /* |
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406 | * Switch ourself out because we blocked as a result of the |
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407 | * _Thread_queue_Enqueue. |
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408 | */ |
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409 | |
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410 | if ( _Thread_Executing->Wait.return_code ) |
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411 | return _Thread_Executing->Wait.return_code; |
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412 | |
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413 | status = pthread_mutex_lock( mutex ); |
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414 | if ( status ) |
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415 | return EINVAL; |
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416 | |
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417 | return _Thread_Executing->Wait.return_code; |
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418 | } |
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419 | return POSIX_BOTTOM_REACHED(); |
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420 | } |
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421 | |
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422 | /*PAGE |
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423 | * |
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424 | * 11.4.4 Waiting on a Condition, P1003.1c/Draft 10, p. 105 |
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425 | */ |
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426 | |
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427 | int pthread_cond_wait( |
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428 | pthread_cond_t *cond, |
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429 | pthread_mutex_t *mutex |
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430 | ) |
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431 | { |
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432 | return _POSIX_Condition_variables_Wait_support( |
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433 | cond, |
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434 | mutex, |
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435 | THREAD_QUEUE_WAIT_FOREVER |
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436 | ); |
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437 | } |
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438 | |
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439 | /*PAGE |
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440 | * |
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441 | * 11.4.4 Waiting on a Condition, P1003.1c/Draft 10, p. 105 |
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442 | */ |
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443 | |
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444 | int pthread_cond_timedwait( |
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445 | pthread_cond_t *cond, |
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446 | pthread_mutex_t *mutex, |
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447 | const struct timespec *abstime |
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448 | ) |
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449 | { |
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450 | return _POSIX_Condition_variables_Wait_support( |
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451 | cond, |
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452 | mutex, |
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453 | _POSIX_Timespec_to_interval( abstime ) |
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454 | ); |
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455 | } |
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