1 | /* mutex.c |
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2 | * |
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3 | * $Id$ |
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4 | */ |
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5 | |
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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/score/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 | |
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14 | #include <rtems/posix/mutex.h> |
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15 | #include <rtems/posix/priority.h> |
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16 | #include <rtems/posix/time.h> |
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17 | |
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18 | /*PAGE |
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19 | * |
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20 | * The default mutex attributes structure. |
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21 | */ |
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22 | |
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23 | const pthread_mutexattr_t _POSIX_Mutex_Default_attributes = { |
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24 | TRUE, /* is_initialized */ |
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25 | PTHREAD_PROCESS_PRIVATE, /* process_shared */ |
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26 | POSIX_SCHEDULER_MINIMUM_PRIORITY, /* prio_ceiling */ |
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27 | PTHREAD_PRIO_NONE, /* protocol */ |
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28 | FALSE /* recursive */ |
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29 | }; |
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30 | |
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31 | /*PAGE |
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32 | * |
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33 | * _POSIX_Mutex_Manager_initialization |
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34 | * |
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35 | * This routine initializes all mutex manager related data structures. |
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36 | * |
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37 | * Input parameters: |
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38 | * maximum_mutexes - maximum configured mutexes |
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39 | * |
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40 | * Output parameters: NONE |
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41 | */ |
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42 | |
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43 | void _POSIX_Mutex_Manager_initialization( |
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44 | unsigned32 maximum_mutexes |
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45 | ) |
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46 | { |
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47 | _Objects_Initialize_information( |
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48 | &_POSIX_Mutex_Information, |
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49 | OBJECTS_POSIX_MUTEXES, |
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50 | TRUE, |
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51 | maximum_mutexes, |
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52 | sizeof( POSIX_Mutex_Control ), |
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53 | FALSE, |
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54 | 0, |
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55 | FALSE |
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56 | ); |
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57 | } |
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58 | |
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59 | /*PAGE |
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60 | * |
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61 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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62 | */ |
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63 | |
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64 | int pthread_mutexattr_init( |
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65 | pthread_mutexattr_t *attr |
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66 | ) |
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67 | { |
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68 | if ( !attr ) |
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69 | return EINVAL; |
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70 | |
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71 | *attr = _POSIX_Mutex_Default_attributes; |
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72 | return 0; |
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73 | } |
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74 | |
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75 | /*PAGE |
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76 | * |
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77 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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78 | */ |
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79 | |
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80 | int pthread_mutexattr_destroy( |
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81 | pthread_mutexattr_t *attr |
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82 | ) |
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83 | { |
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84 | if ( !attr || attr->is_initialized == FALSE ) |
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85 | return EINVAL; |
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86 | |
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87 | attr->is_initialized = FALSE; |
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88 | return 0; |
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89 | } |
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90 | |
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91 | /*PAGE |
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92 | * |
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93 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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94 | */ |
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95 | |
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96 | int pthread_mutexattr_getpshared( |
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97 | const pthread_mutexattr_t *attr, |
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98 | int *pshared |
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99 | ) |
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100 | { |
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101 | if ( !attr ) |
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102 | return EINVAL; |
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103 | |
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104 | *pshared = attr->process_shared; |
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105 | return 0; |
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106 | } |
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107 | |
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108 | /*PAGE |
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109 | * |
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110 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
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111 | */ |
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112 | |
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113 | int pthread_mutexattr_setpshared( |
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114 | pthread_mutexattr_t *attr, |
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115 | int pshared |
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116 | ) |
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117 | { |
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118 | if ( !attr ) |
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119 | return EINVAL; |
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120 | |
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121 | attr->process_shared = pshared; |
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122 | return 0; |
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123 | } |
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124 | |
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125 | /*PAGE |
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126 | * |
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127 | * 11.3.2 Initializing and Destroying a Mutex, P1003.1c/Draft 10, p. 87 |
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128 | * |
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129 | * NOTE: XXX Could be optimized so all the attribute error checking |
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130 | * is not performed when attr is NULL. |
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131 | */ |
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132 | |
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133 | int pthread_mutex_init( |
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134 | pthread_mutex_t *mutex, |
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135 | const pthread_mutexattr_t *attr |
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136 | ) |
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137 | { |
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138 | POSIX_Mutex_Control *the_mutex; |
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139 | CORE_mutex_Attributes *the_mutex_attr; |
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140 | const pthread_mutexattr_t *the_attr; |
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141 | CORE_mutex_Disciplines the_discipline; |
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142 | |
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143 | if ( attr ) the_attr = attr; |
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144 | else the_attr = &_POSIX_Mutex_Default_attributes; |
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145 | |
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146 | /* |
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147 | * XXX: Be careful about attributes when global!!! |
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148 | */ |
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149 | |
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150 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
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151 | return POSIX_MP_NOT_IMPLEMENTED(); |
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152 | |
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153 | if ( !the_attr->is_initialized ) |
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154 | return EINVAL; |
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155 | |
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156 | /* |
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157 | * Determine the discipline of the mutex |
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158 | */ |
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159 | |
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160 | switch ( the_attr->protocol ) { |
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161 | case PTHREAD_PRIO_NONE: |
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162 | the_discipline = CORE_MUTEX_DISCIPLINES_FIFO; |
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163 | break; |
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164 | case PTHREAD_PRIO_INHERIT: |
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165 | the_discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT; |
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166 | break; |
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167 | case PTHREAD_PRIO_PROTECT: |
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168 | the_discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING; |
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169 | break; |
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170 | default: |
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171 | return EINVAL; |
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172 | } |
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173 | |
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174 | if ( !_POSIX_Priority_Is_valid( the_attr->prio_ceiling ) ) |
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175 | return EINVAL; |
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176 | |
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177 | _Thread_Disable_dispatch(); |
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178 | |
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179 | the_mutex = _POSIX_Mutex_Allocate(); |
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180 | |
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181 | if ( !the_mutex ) { |
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182 | _Thread_Enable_dispatch(); |
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183 | return ENOMEM; |
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184 | } |
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185 | |
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186 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED && |
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187 | !( _Objects_MP_Allocate_and_open( &_POSIX_Mutex_Information, 0, |
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188 | the_mutex->Object.id, FALSE ) ) ) { |
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189 | _POSIX_Mutex_Free( the_mutex ); |
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190 | _Thread_Enable_dispatch(); |
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191 | return EAGAIN; |
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192 | } |
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193 | |
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194 | the_mutex->process_shared = the_attr->process_shared; |
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195 | |
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196 | the_mutex_attr = &the_mutex->Mutex.Attributes; |
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197 | |
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198 | the_mutex_attr->allow_nesting = the_attr->recursive; |
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199 | the_mutex_attr->priority_ceiling = |
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200 | _POSIX_Priority_To_core( the_attr->prio_ceiling ); |
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201 | the_mutex_attr->discipline = the_discipline; |
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202 | |
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203 | /* |
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204 | * Must be initialized to unlocked. |
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205 | */ |
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206 | |
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207 | _CORE_mutex_Initialize( |
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208 | &the_mutex->Mutex, |
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209 | OBJECTS_POSIX_MUTEXES, |
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210 | the_mutex_attr, |
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211 | CORE_MUTEX_UNLOCKED, |
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212 | 0 /* XXX proxy_extract_callout */ |
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213 | ); |
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214 | |
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215 | _Objects_Open( &_POSIX_Mutex_Information, &the_mutex->Object, 0 ); |
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216 | |
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217 | *mutex = the_mutex->Object.id; |
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218 | |
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219 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
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220 | _POSIX_Mutex_MP_Send_process_packet( |
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221 | POSIX_MUTEX_MP_ANNOUNCE_CREATE, |
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222 | the_mutex->Object.id, |
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223 | 0, /* Name not used */ |
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224 | 0 /* Not used */ |
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225 | ); |
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226 | |
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227 | _Thread_Enable_dispatch(); |
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228 | return 0; |
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229 | } |
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230 | |
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231 | /*PAGE |
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232 | * |
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233 | * 11.3.2 Initializing and Destroying a Mutex, P1003.1c/Draft 10, p. 87 |
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234 | */ |
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235 | |
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236 | int pthread_mutex_destroy( |
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237 | pthread_mutex_t *mutex |
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238 | ) |
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239 | { |
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240 | register POSIX_Mutex_Control *the_mutex; |
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241 | Objects_Locations location; |
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242 | |
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243 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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244 | switch ( location ) { |
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245 | case OBJECTS_ERROR: |
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246 | return EINVAL; |
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247 | case OBJECTS_REMOTE: |
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248 | _Thread_Dispatch(); |
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249 | return POSIX_MP_NOT_IMPLEMENTED(); |
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250 | return EINVAL; |
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251 | case OBJECTS_LOCAL: |
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252 | /* |
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253 | * XXX: There is an error for the mutex being locked |
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254 | * or being in use by a condition variable. |
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255 | */ |
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256 | |
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257 | if ( _CORE_mutex_Is_locked( &the_mutex->Mutex ) ) { |
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258 | _Thread_Enable_dispatch(); |
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259 | return EBUSY; |
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260 | } |
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261 | |
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262 | _Objects_Close( &_POSIX_Mutex_Information, &the_mutex->Object ); |
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263 | |
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264 | _CORE_mutex_Flush( |
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265 | &the_mutex->Mutex, |
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266 | _POSIX_Mutex_MP_Send_object_was_deleted, |
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267 | EINVAL |
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268 | ); |
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269 | |
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270 | _POSIX_Mutex_Free( the_mutex ); |
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271 | |
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272 | if ( the_mutex->process_shared == PTHREAD_PROCESS_SHARED ) { |
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273 | |
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274 | _Objects_MP_Close( &_POSIX_Mutex_Information, the_mutex->Object.id ); |
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275 | |
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276 | _POSIX_Mutex_MP_Send_process_packet( |
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277 | POSIX_MUTEX_MP_ANNOUNCE_DELETE, |
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278 | the_mutex->Object.id, |
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279 | 0, /* Not used */ |
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280 | 0 /* Not used */ |
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281 | ); |
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282 | } |
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283 | _Thread_Enable_dispatch(); |
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284 | return 0; |
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285 | } |
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286 | return POSIX_BOTTOM_REACHED(); |
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287 | } |
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288 | |
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289 | /* |
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290 | * _POSIX_Mutex_Lock_support |
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291 | * |
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292 | * A support routine which implements guts of the blocking, non-blocking, and |
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293 | * timed wait version of mutex lock. |
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294 | */ |
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295 | |
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296 | int _POSIX_Mutex_Lock_support( |
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297 | pthread_mutex_t *mutex, |
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298 | boolean blocking, |
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299 | Watchdog_Interval timeout |
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300 | ) |
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301 | { |
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302 | register POSIX_Mutex_Control *the_mutex; |
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303 | Objects_Locations location; |
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304 | |
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305 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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306 | switch ( location ) { |
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307 | case OBJECTS_ERROR: |
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308 | return EINVAL; |
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309 | case OBJECTS_REMOTE: |
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310 | return _POSIX_Mutex_MP_Send_request_packet( |
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311 | POSIX_MUTEX_MP_OBTAIN_REQUEST, |
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312 | *mutex, |
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313 | 0, /* must define the option set */ |
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314 | WATCHDOG_NO_TIMEOUT |
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315 | ); |
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316 | case OBJECTS_LOCAL: |
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317 | _CORE_mutex_Seize( |
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318 | &the_mutex->Mutex, |
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319 | the_mutex->Object.id, |
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320 | blocking, |
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321 | timeout |
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322 | ); |
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323 | _Thread_Enable_dispatch(); |
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324 | return _Thread_Executing->Wait.return_code; |
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325 | break; |
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326 | } |
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327 | return POSIX_BOTTOM_REACHED(); |
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328 | } |
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329 | |
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330 | /*PAGE |
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331 | * |
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332 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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333 | * |
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334 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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335 | */ |
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336 | |
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337 | int pthread_mutex_lock( |
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338 | pthread_mutex_t *mutex |
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339 | ) |
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340 | { |
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341 | return _POSIX_Mutex_Lock_support( mutex, TRUE, THREAD_QUEUE_WAIT_FOREVER ); |
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342 | } |
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343 | |
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344 | /*PAGE |
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345 | * |
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346 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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347 | * |
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348 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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349 | */ |
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350 | |
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351 | int pthread_mutex_trylock( |
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352 | pthread_mutex_t *mutex |
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353 | ) |
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354 | { |
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355 | return _POSIX_Mutex_Lock_support( mutex, FALSE, THREAD_QUEUE_WAIT_FOREVER ); |
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356 | } |
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357 | |
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358 | /*PAGE |
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359 | * |
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360 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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361 | * |
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362 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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363 | */ |
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364 | |
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365 | void POSIX_Threads_mutex_MP_support( |
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366 | Thread_Control *the_thread, |
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367 | Objects_Id id |
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368 | ) |
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369 | { |
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370 | (void) POSIX_MP_NOT_IMPLEMENTED(); /* XXX: should never get here */ |
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371 | } |
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372 | |
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373 | int pthread_mutex_unlock( |
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374 | pthread_mutex_t *mutex |
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375 | ) |
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376 | { |
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377 | register POSIX_Mutex_Control *the_mutex; |
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378 | Objects_Locations location; |
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379 | |
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380 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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381 | switch ( location ) { |
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382 | case OBJECTS_ERROR: |
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383 | return EINVAL; |
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384 | case OBJECTS_REMOTE: |
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385 | return _POSIX_Mutex_MP_Send_request_packet( |
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386 | POSIX_MUTEX_MP_RELEASE_REQUEST, |
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387 | *mutex, |
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388 | 0, /* Not used */ |
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389 | MPCI_DEFAULT_TIMEOUT |
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390 | ); |
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391 | case OBJECTS_LOCAL: |
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392 | _CORE_mutex_Surrender( |
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393 | &the_mutex->Mutex, |
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394 | the_mutex->Object.id, |
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395 | POSIX_Threads_mutex_MP_support |
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396 | ); |
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397 | _Thread_Enable_dispatch(); |
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398 | return _Thread_Executing->Wait.return_code; /* XXX return status */ |
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399 | break; |
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400 | } |
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401 | return POSIX_BOTTOM_REACHED(); |
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402 | } |
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403 | |
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404 | /*PAGE |
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405 | * |
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406 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
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407 | * |
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408 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
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409 | */ |
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410 | |
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411 | int pthread_mutex_timedlock( |
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412 | pthread_mutex_t *mutex, |
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413 | const struct timespec *timeout |
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414 | ) |
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415 | { |
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416 | return _POSIX_Mutex_Lock_support( |
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417 | mutex, |
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418 | TRUE, |
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419 | _POSIX_Time_Spec_to_interval( timeout ) |
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420 | ); |
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421 | } |
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422 | |
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423 | /*PAGE |
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424 | * |
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425 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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426 | */ |
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427 | |
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428 | int pthread_mutexattr_setprotocol( |
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429 | pthread_mutexattr_t *attr, |
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430 | int protocol |
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431 | ) |
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432 | { |
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433 | if ( !attr ) |
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434 | return EINVAL; |
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435 | |
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436 | attr->protocol = protocol; |
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437 | return 0; |
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438 | } |
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439 | |
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440 | /*PAGE |
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441 | * |
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442 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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443 | */ |
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444 | |
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445 | int pthread_mutexattr_getprotocol( |
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446 | const pthread_mutexattr_t *attr, |
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447 | int *protocol |
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448 | ) |
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449 | { |
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450 | if ( !attr ) |
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451 | return EINVAL; |
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452 | |
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453 | *protocol = attr->protocol; |
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454 | return 0; |
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455 | } |
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456 | |
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457 | /*PAGE |
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458 | * |
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459 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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460 | */ |
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461 | |
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462 | int pthread_mutexattr_setprioceiling( |
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463 | pthread_mutexattr_t *attr, |
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464 | int prioceiling |
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465 | ) |
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466 | { |
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467 | if ( !attr ) |
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468 | return EINVAL; |
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469 | |
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470 | if ( !_POSIX_Priority_Is_valid( attr->prio_ceiling ) ) |
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471 | return EINVAL; |
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472 | |
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473 | attr->prio_ceiling = prioceiling; |
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474 | return 0; |
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475 | } |
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476 | |
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477 | /*PAGE |
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478 | * |
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479 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
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480 | */ |
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481 | |
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482 | int pthread_mutexattr_getprioceiling( |
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483 | const pthread_mutexattr_t *attr, |
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484 | int *prioceiling |
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485 | ) |
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486 | { |
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487 | if ( !attr ) |
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488 | return EINVAL; |
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489 | |
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490 | *prioceiling = attr->prio_ceiling; |
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491 | return 0; |
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492 | } |
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493 | |
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494 | /*PAGE |
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495 | * |
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496 | * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 |
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497 | */ |
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498 | |
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499 | int pthread_mutex_setprioceiling( |
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500 | pthread_mutex_t *mutex, |
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501 | int prioceiling, |
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502 | int *old_ceiling |
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503 | ) |
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504 | { |
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505 | register POSIX_Mutex_Control *the_mutex; |
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506 | Objects_Locations location; |
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507 | Priority_Control the_priority; |
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508 | int status; |
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509 | |
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510 | if ( !_POSIX_Priority_Is_valid( prioceiling ) ) |
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511 | return EINVAL; |
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512 | |
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513 | the_priority = _POSIX_Priority_To_core( prioceiling ); |
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514 | |
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515 | /* |
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516 | * Must acquire the mutex before we can change it's ceiling |
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517 | */ |
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518 | |
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519 | status = pthread_mutex_lock( mutex ); |
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520 | if ( status ) |
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521 | return status; |
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522 | |
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523 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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524 | switch ( location ) { |
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525 | case OBJECTS_ERROR: |
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526 | return EINVAL; |
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527 | case OBJECTS_REMOTE: |
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528 | return POSIX_MP_NOT_IMPLEMENTED(); /* XXX feels questionable */ |
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529 | return EINVAL; |
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530 | case OBJECTS_LOCAL: |
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531 | the_mutex->Mutex.Attributes.priority_ceiling = the_priority; |
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532 | _CORE_mutex_Surrender( |
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533 | &the_mutex->Mutex, |
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534 | the_mutex->Object.id, |
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535 | POSIX_Threads_mutex_MP_support |
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536 | ); |
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537 | _Thread_Enable_dispatch(); |
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538 | return 0; |
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539 | } |
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540 | return POSIX_BOTTOM_REACHED(); |
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541 | } |
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542 | |
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543 | /*PAGE |
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544 | * |
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545 | * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 |
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546 | */ |
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547 | |
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548 | int pthread_mutex_getprioceiling( |
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549 | pthread_mutex_t *mutex, |
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550 | int *prioceiling |
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551 | ) |
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552 | { |
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553 | register POSIX_Mutex_Control *the_mutex; |
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554 | Objects_Locations location; |
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555 | |
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556 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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557 | switch ( location ) { |
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558 | case OBJECTS_ERROR: |
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559 | return EINVAL; |
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560 | case OBJECTS_REMOTE: |
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561 | return POSIX_MP_NOT_IMPLEMENTED(); /* XXX feels questionable */ |
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562 | case OBJECTS_LOCAL: |
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563 | *prioceiling = _POSIX_Priority_From_core( |
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564 | the_mutex->Mutex.Attributes.priority_ceiling |
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565 | ); |
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566 | _Thread_Enable_dispatch(); |
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567 | return 0; |
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568 | } |
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569 | return POSIX_BOTTOM_REACHED(); |
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570 | } |
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