1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #include <assert.h> |
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6 | #include <errno.h> |
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7 | #include <pthread.h> |
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8 | |
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9 | #include <rtems/system.h> |
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10 | #include <rtems/score/coremutex.h> |
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11 | #include <rtems/score/watchdog.h> |
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12 | #include <rtems/score/mpci.h> |
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13 | #include <rtems/posix/mutex.h> |
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14 | #include <rtems/posix/priority.h> |
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15 | #include <rtems/posix/time.h> |
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16 | |
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17 | /* |
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18 | * TEMPORARY |
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19 | */ |
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20 | |
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21 | void _POSIX_Mutex_MP_Send_process_packet ( |
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22 | POSIX_Mutex_MP_Remote_operations operation, |
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23 | Objects_Id mutex_id, |
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24 | Objects_Name name, |
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25 | Objects_Id proxy_id |
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26 | ) |
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27 | { |
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28 | (void) POSIX_MP_NOT_IMPLEMENTED(); |
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29 | } |
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30 | |
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31 | void _POSIX_Mutex_MP_Send_object_was_deleted ( |
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32 | Thread_Control *the_proxy |
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33 | ) |
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34 | { |
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35 | (void) POSIX_MP_NOT_IMPLEMENTED(); |
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36 | } |
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37 | |
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38 | int _POSIX_Mutex_MP_Send_request_packet ( |
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39 | POSIX_Mutex_MP_Remote_operations operation, |
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40 | Objects_Id mutex_id, |
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41 | boolean wait, /* XXX options */ |
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42 | Watchdog_Interval timeout |
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43 | ) |
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44 | { |
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45 | return POSIX_MP_NOT_IMPLEMENTED(); |
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46 | } |
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47 | |
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48 | void POSIX_Threads_mutex_MP_support( |
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49 | Thread_Control *the_thread, |
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50 | Objects_Id id |
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51 | ) |
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52 | { |
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53 | (void) POSIX_MP_NOT_IMPLEMENTED(); /* XXX: should never get here */ |
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54 | } |
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55 | |
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56 | /* |
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57 | * END OF TEMPORARY |
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58 | */ |
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59 | |
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60 | /*PAGE |
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61 | * |
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62 | * The default mutex attributes structure. |
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63 | */ |
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64 | |
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65 | const pthread_mutexattr_t _POSIX_Mutex_Default_attributes = { |
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66 | TRUE, /* is_initialized */ |
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67 | PTHREAD_PROCESS_PRIVATE, /* process_shared */ |
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68 | POSIX_SCHEDULER_MAXIMUM_PRIORITY, /* prio_ceiling */ |
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69 | PTHREAD_PRIO_NONE, /* protocol */ |
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70 | FALSE /* recursive */ |
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71 | }; |
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72 | |
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73 | /*PAGE |
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74 | * |
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75 | * _POSIX_Mutex_From_core_mutex_status |
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76 | */ |
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77 | |
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78 | int _POSIX_Mutex_From_core_mutex_status( |
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79 | CORE_mutex_Status status |
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80 | ) |
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81 | { |
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82 | switch ( status ) { |
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83 | case CORE_MUTEX_STATUS_SUCCESSFUL: |
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84 | return 0; |
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85 | case CORE_MUTEX_STATUS_UNSATISFIED_NOWAIT: |
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86 | return EBUSY; |
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87 | case CORE_MUTEX_STATUS_NESTING_NOT_ALLOWED: |
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88 | return EDEADLK; |
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89 | case CORE_MUTEX_STATUS_NOT_OWNER_OF_RESOURCE: |
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90 | return EPERM; |
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91 | case CORE_MUTEX_WAS_DELETED: |
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92 | return EINVAL; |
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93 | case CORE_MUTEX_TIMEOUT: |
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94 | return EAGAIN; |
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95 | case CORE_MUTEX_STATUS_CEILING_VIOLATED: |
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96 | return EINVAL; |
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97 | default: |
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98 | break; |
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99 | } |
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100 | assert( 0 ); |
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101 | return 0; |
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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 | * _POSIX_Mutex_Manager_initialization |
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107 | * |
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108 | * This routine initializes all mutex manager related data structures. |
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109 | * |
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110 | * Input parameters: |
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111 | * maximum_mutexes - maximum configured mutexes |
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112 | * |
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113 | * Output parameters: NONE |
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114 | */ |
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115 | |
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116 | void _POSIX_Mutex_Manager_initialization( |
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117 | unsigned32 maximum_mutexes |
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118 | ) |
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119 | { |
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120 | _Objects_Initialize_information( |
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121 | &_POSIX_Mutex_Information, |
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122 | OBJECTS_POSIX_MUTEXES, |
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123 | TRUE, |
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124 | maximum_mutexes, |
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125 | sizeof( POSIX_Mutex_Control ), |
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126 | FALSE, |
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127 | 0, |
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128 | FALSE |
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129 | ); |
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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 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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135 | */ |
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136 | |
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137 | int pthread_mutexattr_init( |
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138 | pthread_mutexattr_t *attr |
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139 | ) |
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140 | { |
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141 | if ( !attr ) |
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142 | return EINVAL; |
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143 | |
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144 | *attr = _POSIX_Mutex_Default_attributes; |
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145 | return 0; |
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146 | } |
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147 | |
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148 | /*PAGE |
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149 | * |
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150 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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151 | */ |
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152 | |
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153 | int pthread_mutexattr_destroy( |
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154 | pthread_mutexattr_t *attr |
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155 | ) |
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156 | { |
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157 | if ( !attr || !attr->is_initialized ) |
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158 | return EINVAL; |
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159 | |
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160 | attr->is_initialized = FALSE; |
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161 | return 0; |
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162 | } |
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163 | |
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164 | /*PAGE |
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165 | * |
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166 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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167 | */ |
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168 | |
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169 | int pthread_mutexattr_getpshared( |
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170 | const pthread_mutexattr_t *attr, |
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171 | int *pshared |
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172 | ) |
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173 | { |
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174 | if ( !attr || !attr->is_initialized || !pshared ) |
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175 | return EINVAL; |
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176 | |
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177 | *pshared = attr->process_shared; |
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178 | return 0; |
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179 | } |
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180 | |
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181 | /*PAGE |
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182 | * |
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183 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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184 | */ |
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185 | |
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186 | int pthread_mutexattr_setpshared( |
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187 | pthread_mutexattr_t *attr, |
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188 | int pshared |
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189 | ) |
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190 | { |
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191 | if ( !attr || !attr->is_initialized ) |
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192 | return EINVAL; |
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193 | |
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194 | switch ( pshared ) { |
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195 | case PTHREAD_PROCESS_SHARED: |
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196 | case PTHREAD_PROCESS_PRIVATE: |
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197 | attr->process_shared = pshared; |
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198 | return 0; |
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199 | |
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200 | default: |
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201 | return EINVAL; |
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202 | } |
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203 | } |
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204 | |
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205 | /*PAGE |
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206 | * |
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207 | * 11.3.2 Initializing and Destroying a Mutex, P1003.1c/Draft 10, p. 87 |
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208 | * |
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209 | * NOTE: XXX Could be optimized so all the attribute error checking |
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210 | * is not performed when attr is NULL. |
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211 | */ |
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212 | |
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213 | int pthread_mutex_init( |
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214 | pthread_mutex_t *mutex, |
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215 | const pthread_mutexattr_t *attr |
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216 | ) |
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217 | { |
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218 | POSIX_Mutex_Control *the_mutex; |
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219 | CORE_mutex_Attributes *the_mutex_attr; |
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220 | const pthread_mutexattr_t *the_attr; |
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221 | CORE_mutex_Disciplines the_discipline; |
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222 | |
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223 | if ( attr ) the_attr = attr; |
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224 | else the_attr = &_POSIX_Mutex_Default_attributes; |
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225 | |
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226 | if ( !the_attr->is_initialized ) |
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227 | return EINVAL; |
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228 | |
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229 | /* |
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230 | * XXX: Be careful about attributes when global!!! |
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231 | */ |
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232 | |
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233 | assert( the_attr->process_shared == PTHREAD_PROCESS_PRIVATE ); |
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234 | |
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235 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
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236 | return POSIX_MP_NOT_IMPLEMENTED(); |
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237 | |
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238 | /* |
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239 | * Determine the discipline of the mutex |
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240 | */ |
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241 | |
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242 | switch ( the_attr->protocol ) { |
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243 | case PTHREAD_PRIO_NONE: |
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244 | the_discipline = CORE_MUTEX_DISCIPLINES_FIFO; |
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245 | break; |
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246 | case PTHREAD_PRIO_INHERIT: |
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247 | the_discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT; |
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248 | break; |
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249 | case PTHREAD_PRIO_PROTECT: |
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250 | the_discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING; |
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251 | break; |
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252 | default: |
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253 | return EINVAL; |
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254 | } |
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255 | |
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256 | if ( !_POSIX_Priority_Is_valid( the_attr->prio_ceiling ) ) |
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257 | return EINVAL; |
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258 | |
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259 | _Thread_Disable_dispatch(); |
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260 | |
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261 | the_mutex = _POSIX_Mutex_Allocate(); |
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262 | |
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263 | if ( !the_mutex ) { |
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264 | _Thread_Enable_dispatch(); |
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265 | return ENOMEM; |
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266 | } |
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267 | |
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268 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED && |
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269 | !( _Objects_MP_Allocate_and_open( &_POSIX_Mutex_Information, 0, |
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270 | the_mutex->Object.id, FALSE ) ) ) { |
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271 | _POSIX_Mutex_Free( the_mutex ); |
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272 | _Thread_Enable_dispatch(); |
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273 | return EAGAIN; |
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274 | } |
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275 | |
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276 | the_mutex->process_shared = the_attr->process_shared; |
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277 | |
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278 | the_mutex_attr = &the_mutex->Mutex.Attributes; |
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279 | |
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280 | the_mutex_attr->allow_nesting = the_attr->recursive; |
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281 | the_mutex_attr->priority_ceiling = |
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282 | _POSIX_Priority_To_core( the_attr->prio_ceiling ); |
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283 | the_mutex_attr->discipline = the_discipline; |
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284 | |
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285 | /* |
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286 | * Must be initialized to unlocked. |
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287 | */ |
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288 | |
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289 | _CORE_mutex_Initialize( |
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290 | &the_mutex->Mutex, |
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291 | OBJECTS_POSIX_MUTEXES, |
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292 | the_mutex_attr, |
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293 | CORE_MUTEX_UNLOCKED, |
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294 | NULL /* proxy_extract_callout */ |
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295 | ); |
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296 | |
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297 | _Objects_Open( &_POSIX_Mutex_Information, &the_mutex->Object, 0 ); |
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298 | |
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299 | *mutex = the_mutex->Object.id; |
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300 | |
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301 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
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302 | _POSIX_Mutex_MP_Send_process_packet( |
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303 | POSIX_MUTEX_MP_ANNOUNCE_CREATE, |
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304 | the_mutex->Object.id, |
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305 | 0, /* Name not used */ |
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306 | 0 /* Not used */ |
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307 | ); |
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308 | |
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309 | _Thread_Enable_dispatch(); |
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310 | return 0; |
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311 | } |
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312 | |
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313 | /*PAGE |
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314 | * |
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315 | * 11.3.2 Initializing and Destroying a Mutex, P1003.1c/Draft 10, p. 87 |
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316 | */ |
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317 | |
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318 | int pthread_mutex_destroy( |
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319 | pthread_mutex_t *mutex |
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320 | ) |
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321 | { |
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322 | register POSIX_Mutex_Control *the_mutex; |
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323 | Objects_Locations location; |
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324 | |
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325 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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326 | switch ( location ) { |
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327 | case OBJECTS_ERROR: |
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328 | return EINVAL; |
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329 | case OBJECTS_REMOTE: |
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330 | _Thread_Dispatch(); |
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331 | return POSIX_MP_NOT_IMPLEMENTED(); |
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332 | return EINVAL; |
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333 | case OBJECTS_LOCAL: |
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334 | /* |
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335 | * XXX: There is an error for the mutex being locked |
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336 | * or being in use by a condition variable. |
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337 | */ |
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338 | |
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339 | if ( _CORE_mutex_Is_locked( &the_mutex->Mutex ) ) { |
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340 | _Thread_Enable_dispatch(); |
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341 | return EBUSY; |
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342 | } |
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343 | |
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344 | _Objects_Close( &_POSIX_Mutex_Information, &the_mutex->Object ); |
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345 | |
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346 | _CORE_mutex_Flush( |
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347 | &the_mutex->Mutex, |
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348 | _POSIX_Mutex_MP_Send_object_was_deleted, |
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349 | EINVAL |
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350 | ); |
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351 | |
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352 | _POSIX_Mutex_Free( the_mutex ); |
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353 | |
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354 | if ( the_mutex->process_shared == PTHREAD_PROCESS_SHARED ) { |
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355 | |
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356 | _Objects_MP_Close( &_POSIX_Mutex_Information, the_mutex->Object.id ); |
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357 | |
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358 | _POSIX_Mutex_MP_Send_process_packet( |
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359 | POSIX_MUTEX_MP_ANNOUNCE_DELETE, |
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360 | the_mutex->Object.id, |
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361 | 0, /* Not used */ |
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362 | 0 /* Not used */ |
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363 | ); |
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364 | } |
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365 | _Thread_Enable_dispatch(); |
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366 | return 0; |
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367 | } |
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368 | return POSIX_BOTTOM_REACHED(); |
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369 | } |
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370 | |
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371 | /*PAGE |
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372 | * |
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373 | * _POSIX_Mutex_Lock_support |
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374 | * |
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375 | * A support routine which implements guts of the blocking, non-blocking, and |
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376 | * timed wait version of mutex lock. |
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377 | */ |
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378 | |
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379 | int _POSIX_Mutex_Lock_support( |
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380 | pthread_mutex_t *mutex, |
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381 | boolean blocking, |
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382 | Watchdog_Interval timeout |
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383 | ) |
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384 | { |
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385 | register POSIX_Mutex_Control *the_mutex; |
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386 | Objects_Locations location; |
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387 | |
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388 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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389 | switch ( location ) { |
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390 | case OBJECTS_ERROR: |
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391 | return EINVAL; |
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392 | case OBJECTS_REMOTE: |
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393 | return _POSIX_Mutex_MP_Send_request_packet( |
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394 | POSIX_MUTEX_MP_OBTAIN_REQUEST, |
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395 | *mutex, |
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396 | 0, /* must define the option set */ |
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397 | WATCHDOG_NO_TIMEOUT |
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398 | ); |
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399 | case OBJECTS_LOCAL: |
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400 | _CORE_mutex_Seize( |
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401 | &the_mutex->Mutex, |
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402 | the_mutex->Object.id, |
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403 | blocking, |
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404 | timeout |
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405 | ); |
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406 | _Thread_Enable_dispatch(); |
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407 | return _POSIX_Mutex_From_core_mutex_status( |
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408 | (CORE_mutex_Status) _Thread_Executing->Wait.return_code |
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409 | ); |
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410 | } |
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411 | return POSIX_BOTTOM_REACHED(); |
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412 | } |
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413 | |
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414 | /*PAGE |
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415 | * |
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416 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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417 | * |
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418 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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419 | */ |
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420 | |
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421 | int pthread_mutex_lock( |
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422 | pthread_mutex_t *mutex |
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423 | ) |
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424 | { |
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425 | return _POSIX_Mutex_Lock_support( mutex, TRUE, THREAD_QUEUE_WAIT_FOREVER ); |
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426 | } |
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427 | |
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428 | /*PAGE |
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429 | * |
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430 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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431 | * |
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432 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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433 | */ |
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434 | |
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435 | int pthread_mutex_trylock( |
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436 | pthread_mutex_t *mutex |
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437 | ) |
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438 | { |
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439 | return _POSIX_Mutex_Lock_support( mutex, FALSE, THREAD_QUEUE_WAIT_FOREVER ); |
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440 | } |
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441 | |
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442 | /*PAGE |
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443 | * |
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444 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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445 | * |
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446 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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447 | */ |
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448 | |
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449 | int pthread_mutex_unlock( |
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450 | pthread_mutex_t *mutex |
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451 | ) |
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452 | { |
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453 | register POSIX_Mutex_Control *the_mutex; |
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454 | Objects_Locations location; |
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455 | CORE_mutex_Status status; |
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456 | |
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457 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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458 | switch ( location ) { |
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459 | case OBJECTS_ERROR: |
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460 | return EINVAL; |
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461 | case OBJECTS_REMOTE: |
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462 | return _POSIX_Mutex_MP_Send_request_packet( |
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463 | POSIX_MUTEX_MP_RELEASE_REQUEST, |
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464 | *mutex, |
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465 | 0, /* Not used */ |
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466 | MPCI_DEFAULT_TIMEOUT |
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467 | ); |
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468 | case OBJECTS_LOCAL: |
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469 | status = _CORE_mutex_Surrender( |
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470 | &the_mutex->Mutex, |
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471 | the_mutex->Object.id, |
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472 | POSIX_Threads_mutex_MP_support |
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473 | ); |
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474 | _Thread_Enable_dispatch(); |
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475 | return _POSIX_Mutex_From_core_mutex_status( status ); |
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476 | break; |
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477 | } |
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478 | return POSIX_BOTTOM_REACHED(); |
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479 | } |
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480 | |
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481 | /*PAGE |
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482 | * |
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483 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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484 | * |
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485 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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486 | */ |
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487 | |
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488 | int pthread_mutex_timedlock( |
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489 | pthread_mutex_t *mutex, |
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490 | const struct timespec *timeout |
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491 | ) |
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492 | { |
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493 | return _POSIX_Mutex_Lock_support( |
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494 | mutex, |
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495 | TRUE, |
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496 | _POSIX_Timespec_to_interval( timeout ) |
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497 | ); |
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498 | } |
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499 | |
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500 | /*PAGE |
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501 | * |
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502 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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503 | */ |
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504 | |
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505 | int pthread_mutexattr_setprotocol( |
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506 | pthread_mutexattr_t *attr, |
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507 | int protocol |
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508 | ) |
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509 | { |
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510 | if ( !attr || !attr->is_initialized ) |
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511 | return EINVAL; |
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512 | |
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513 | switch ( protocol ) { |
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514 | case PTHREAD_PRIO_NONE: |
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515 | case PTHREAD_PRIO_INHERIT: |
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516 | case PTHREAD_PRIO_PROTECT: |
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517 | attr->protocol = protocol; |
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518 | return 0; |
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519 | |
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520 | default: |
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521 | return EINVAL; |
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522 | } |
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523 | } |
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524 | |
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525 | /*PAGE |
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526 | * |
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527 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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528 | */ |
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529 | |
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530 | int pthread_mutexattr_getprotocol( |
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531 | const pthread_mutexattr_t *attr, |
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532 | int *protocol |
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533 | ) |
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534 | { |
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535 | if ( !attr || !attr->is_initialized || !protocol ) |
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536 | return EINVAL; |
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537 | |
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538 | *protocol = attr->protocol; |
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539 | return 0; |
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540 | } |
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541 | |
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542 | /*PAGE |
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543 | * |
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544 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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545 | */ |
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546 | |
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547 | int pthread_mutexattr_setprioceiling( |
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548 | pthread_mutexattr_t *attr, |
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549 | int prioceiling |
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550 | ) |
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551 | { |
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552 | if ( !attr || !attr->is_initialized ) |
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553 | return EINVAL; |
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554 | |
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555 | if ( !_POSIX_Priority_Is_valid( prioceiling ) ) |
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556 | return EINVAL; |
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557 | |
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558 | attr->prio_ceiling = prioceiling; |
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559 | return 0; |
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560 | } |
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561 | |
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562 | /*PAGE |
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563 | * |
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564 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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565 | */ |
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566 | |
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567 | int pthread_mutexattr_getprioceiling( |
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568 | const pthread_mutexattr_t *attr, |
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569 | int *prioceiling |
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570 | ) |
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571 | { |
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572 | if ( !attr || !attr->is_initialized || !prioceiling ) |
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573 | return EINVAL; |
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574 | |
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575 | *prioceiling = attr->prio_ceiling; |
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576 | return 0; |
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577 | } |
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578 | |
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579 | /*PAGE |
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580 | * |
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581 | * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 |
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582 | */ |
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583 | |
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584 | int pthread_mutex_setprioceiling( |
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585 | pthread_mutex_t *mutex, |
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586 | int prioceiling, |
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587 | int *old_ceiling |
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588 | ) |
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589 | { |
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590 | register POSIX_Mutex_Control *the_mutex; |
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591 | Objects_Locations location; |
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592 | Priority_Control the_priority; |
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593 | int status; |
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594 | |
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595 | if ( !old_ceiling ) |
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596 | return EINVAL; |
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597 | |
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598 | if ( !_POSIX_Priority_Is_valid( prioceiling ) ) |
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599 | return EINVAL; |
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600 | |
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601 | the_priority = _POSIX_Priority_To_core( prioceiling ); |
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602 | |
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603 | /* |
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604 | * Must acquire the mutex before we can change it's ceiling |
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605 | */ |
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606 | |
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607 | status = pthread_mutex_lock( mutex ); |
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608 | if ( status ) |
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609 | return status; |
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610 | |
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611 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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612 | switch ( location ) { |
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613 | case OBJECTS_ERROR: |
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614 | return EINVAL; /* impossible to get here */ |
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615 | case OBJECTS_REMOTE: |
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616 | /* XXX It feels questionable to set the ceiling on a remote mutex. */ |
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617 | return EINVAL; |
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618 | case OBJECTS_LOCAL: |
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619 | *old_ceiling = the_mutex->Mutex.Attributes.priority_ceiling; |
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620 | the_mutex->Mutex.Attributes.priority_ceiling = the_priority; |
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621 | _CORE_mutex_Surrender( |
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622 | &the_mutex->Mutex, |
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623 | the_mutex->Object.id, |
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624 | POSIX_Threads_mutex_MP_support |
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625 | ); |
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626 | _Thread_Enable_dispatch(); |
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627 | return 0; |
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628 | } |
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629 | return POSIX_BOTTOM_REACHED(); |
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630 | } |
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631 | |
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632 | /*PAGE |
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633 | * |
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634 | * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 |
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635 | */ |
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636 | |
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637 | int pthread_mutex_getprioceiling( |
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638 | pthread_mutex_t *mutex, |
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639 | int *prioceiling |
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640 | ) |
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641 | { |
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642 | register POSIX_Mutex_Control *the_mutex; |
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643 | Objects_Locations location; |
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644 | |
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645 | if ( !prioceiling ) |
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646 | return EINVAL; |
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647 | |
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648 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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649 | switch ( location ) { |
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650 | case OBJECTS_ERROR: |
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651 | return EINVAL; |
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652 | case OBJECTS_REMOTE: |
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653 | return POSIX_MP_NOT_IMPLEMENTED(); /* XXX feels questionable */ |
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654 | case OBJECTS_LOCAL: |
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655 | *prioceiling = _POSIX_Priority_From_core( |
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656 | the_mutex->Mutex.Attributes.priority_ceiling |
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657 | ); |
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658 | _Thread_Enable_dispatch(); |
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659 | return 0; |
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660 | } |
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661 | return POSIX_BOTTOM_REACHED(); |
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662 | } |
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