1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #include <stdarg.h> |
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6 | |
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7 | #include <errno.h> |
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8 | #include <fcntl.h> |
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9 | #include <pthread.h> |
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10 | #include <semaphore.h> |
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11 | #include <limits.h> |
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12 | |
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13 | #include <rtems/system.h> |
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14 | #include <rtems/score/object.h> |
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15 | #include <rtems/posix/semaphore.h> |
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16 | #include <rtems/posix/time.h> |
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17 | #include <rtems/posix/seterr.h> |
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18 | |
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19 | /*PAGE |
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20 | * |
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21 | * _POSIX_Semaphore_Manager_initialization |
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22 | * |
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23 | * This routine initializes all semaphore manager related data structures. |
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24 | * |
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25 | * Input parameters: |
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26 | * maximum_semaphores - maximum configured semaphores |
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27 | * |
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28 | * Output parameters: NONE |
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29 | */ |
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30 | |
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31 | void _POSIX_Semaphore_Manager_initialization( |
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32 | unsigned32 maximum_semaphores |
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33 | ) |
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34 | { |
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35 | _Objects_Initialize_information( |
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36 | &_POSIX_Semaphore_Information, |
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37 | OBJECTS_POSIX_SEMAPHORES, |
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38 | TRUE, |
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39 | maximum_semaphores, |
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40 | sizeof( POSIX_Semaphore_Control ), |
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41 | TRUE, |
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42 | _POSIX_PATH_MAX, |
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43 | FALSE |
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44 | ); |
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45 | } |
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46 | |
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47 | /*PAGE |
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48 | * |
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49 | * _POSIX_Semaphore_Create_support |
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50 | */ |
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51 | |
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52 | int _POSIX_Semaphore_Create_support( |
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53 | const char *name, |
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54 | int pshared, |
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55 | unsigned int value, |
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56 | POSIX_Semaphore_Control **the_sem |
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57 | ) |
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58 | { |
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59 | POSIX_Semaphore_Control *the_semaphore; |
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60 | CORE_semaphore_Attributes *the_sem_attr; |
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61 | |
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62 | _Thread_Disable_dispatch(); |
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63 | |
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64 | /* Sharing semaphores among processes is not currently supported */ |
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65 | if (pshared != 0) { |
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66 | _Thread_Enable_dispatch(); |
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67 | set_errno_and_return_minus_one( ENOSYS ); |
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68 | } |
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69 | |
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70 | the_semaphore = _POSIX_Semaphore_Allocate(); |
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71 | |
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72 | if ( !the_semaphore ) { |
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73 | _Thread_Enable_dispatch(); |
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74 | set_errno_and_return_minus_one( ENOSPC ); |
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75 | } |
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76 | |
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77 | #if defined(RTEMS_MULTIPROCESSING) |
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78 | if ( pshared == PTHREAD_PROCESS_SHARED && |
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79 | !( _Objects_MP_Allocate_and_open( &_POSIX_Semaphore_Information, 0, |
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80 | the_semaphore->Object.id, FALSE ) ) ) { |
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81 | _POSIX_Semaphore_Free( the_semaphore ); |
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82 | _Thread_Enable_dispatch(); |
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83 | set_errno_and_return_minus_one( EAGAIN ); |
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84 | } |
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85 | #endif |
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86 | |
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87 | the_semaphore->process_shared = pshared; |
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88 | |
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89 | if ( name ) { |
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90 | the_semaphore->named = TRUE; |
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91 | the_semaphore->open_count = 1; |
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92 | the_semaphore->linked = TRUE; |
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93 | } |
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94 | else |
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95 | the_semaphore->named = FALSE; |
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96 | |
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97 | the_sem_attr = &the_semaphore->Semaphore.Attributes; |
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98 | |
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99 | /* XXX |
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100 | * |
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101 | * Note should this be based on the current scheduling policy? |
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102 | */ |
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103 | |
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104 | the_sem_attr->discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO; |
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105 | |
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106 | /* |
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107 | * This effectively disables limit checking. |
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108 | */ |
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109 | |
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110 | the_sem_attr->maximum_count = 0xFFFFFFFF; |
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111 | |
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112 | _CORE_semaphore_Initialize( |
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113 | &the_semaphore->Semaphore, |
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114 | OBJECTS_POSIX_SEMAPHORES, |
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115 | the_sem_attr, |
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116 | value, |
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117 | 0 /* XXX - proxy_extract_callout is unused */ |
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118 | ); |
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119 | |
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120 | /* XXX - need Names to be a string!!! */ |
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121 | _Objects_Open( |
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122 | &_POSIX_Semaphore_Information, |
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123 | &the_semaphore->Object, |
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124 | (char *) name |
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125 | ); |
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126 | |
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127 | *the_sem = the_semaphore; |
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128 | |
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129 | #if defined(RTEMS_MULTIPROCESSING) |
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130 | if ( pshared == PTHREAD_PROCESS_SHARED ) |
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131 | _POSIX_Semaphore_MP_Send_process_packet( |
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132 | POSIX_SEMAPHORE_MP_ANNOUNCE_CREATE, |
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133 | the_semaphore->Object.id, |
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134 | (char *) name, |
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135 | 0 /* proxy id - Not used */ |
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136 | ); |
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137 | #endif |
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138 | |
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139 | _Thread_Enable_dispatch(); |
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140 | return 0; |
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141 | } |
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142 | |
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143 | |
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144 | /*PAGE |
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145 | * |
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146 | * 11.2.1 Initialize an Unnamed Semaphore, P1003.1b-1993, p.219 |
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147 | */ |
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148 | |
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149 | int sem_init( |
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150 | sem_t *sem, |
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151 | int pshared, |
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152 | unsigned int value |
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153 | ) |
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154 | { |
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155 | int status; |
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156 | POSIX_Semaphore_Control *the_semaphore; |
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157 | |
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158 | status = _POSIX_Semaphore_Create_support( |
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159 | NULL, |
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160 | pshared, |
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161 | value, |
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162 | &the_semaphore |
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163 | ); |
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164 | |
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165 | if ( status != -1 ) |
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166 | *sem = the_semaphore->Object.id; |
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167 | |
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168 | return status; |
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169 | } |
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170 | |
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171 | /*PAGE |
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172 | * |
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173 | * 11.2.2 Destroy an Unnamed Semaphore, P1003.1b-1993, p.220 |
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174 | */ |
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175 | |
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176 | int sem_destroy( |
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177 | sem_t *sem |
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178 | ) |
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179 | { |
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180 | register POSIX_Semaphore_Control *the_semaphore; |
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181 | Objects_Locations location; |
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182 | |
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183 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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184 | switch ( location ) { |
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185 | case OBJECTS_ERROR: |
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186 | set_errno_and_return_minus_one( EINVAL ); |
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187 | case OBJECTS_REMOTE: |
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188 | _Thread_Dispatch(); |
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189 | return POSIX_MP_NOT_IMPLEMENTED(); |
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190 | set_errno_and_return_minus_one( EINVAL ); |
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191 | case OBJECTS_LOCAL: |
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192 | /* |
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193 | * Undefined operation on a named semaphore. |
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194 | */ |
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195 | |
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196 | if ( the_semaphore->named == TRUE ) { |
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197 | set_errno_and_return_minus_one( EINVAL ); |
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198 | } |
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199 | |
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200 | _Objects_Close( &_POSIX_Semaphore_Information, &the_semaphore->Object ); |
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201 | |
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202 | _CORE_semaphore_Flush( |
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203 | &the_semaphore->Semaphore, |
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204 | #if defined(RTEMS_MULTIPROCESSING) |
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205 | _POSIX_Semaphore_MP_Send_object_was_deleted, |
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206 | #else |
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207 | NULL, |
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208 | #endif |
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209 | -1 /* XXX should also seterrno -> EINVAL */ |
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210 | ); |
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211 | |
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212 | _POSIX_Semaphore_Free( the_semaphore ); |
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213 | |
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214 | #if defined(RTEMS_MULTIPROCESSING) |
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215 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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216 | |
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217 | _Objects_MP_Close( |
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218 | &_POSIX_Semaphore_Information, |
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219 | the_semaphore->Object.id |
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220 | ); |
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221 | |
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222 | _POSIX_Semaphore_MP_Send_process_packet( |
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223 | POSIX_SEMAPHORE_MP_ANNOUNCE_DELETE, |
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224 | the_semaphore->Object.id, |
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225 | 0, /* Not used */ |
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226 | 0 /* Not used */ |
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227 | ); |
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228 | } |
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229 | #endif |
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230 | _Thread_Enable_dispatch(); |
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231 | return 0; |
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232 | } |
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233 | return POSIX_BOTTOM_REACHED(); |
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234 | } |
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235 | |
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236 | /*PAGE |
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237 | * |
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238 | * 11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221 |
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239 | * |
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240 | * NOTE: When oflag is O_CREAT, then optional third and fourth |
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241 | * parameters must be present. |
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242 | */ |
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243 | |
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244 | sem_t *sem_open( |
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245 | const char *name, |
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246 | int oflag, |
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247 | ... |
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248 | /* mode_t mode, */ |
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249 | /* unsigned int value */ |
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250 | ) |
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251 | { |
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252 | va_list arg; |
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253 | mode_t mode; |
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254 | unsigned int value = 0; |
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255 | int status; |
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256 | Objects_Id the_semaphore_id; |
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257 | POSIX_Semaphore_Control *the_semaphore; |
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258 | Objects_Locations location; |
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259 | |
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260 | |
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261 | if ( oflag & O_CREAT ) { |
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262 | va_start(arg, oflag); |
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263 | /*mode = (mode_t) va_arg( arg, mode_t * );*/ |
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264 | mode = va_arg( arg, mode_t ); |
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265 | /*value = (unsigned int) va_arg( arg, unsigned int * );*/ |
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266 | value = va_arg( arg, unsigned int ); |
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267 | va_end(arg); |
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268 | } |
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269 | |
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270 | status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id ); |
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271 | |
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272 | /* |
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273 | * If the name to id translation worked, then the semaphore exists |
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274 | * and we can just return a pointer to the id. Otherwise we may |
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275 | * need to check to see if this is a "semaphore does not exist" |
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276 | * or some other miscellaneous error on the name. |
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277 | */ |
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278 | |
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279 | if ( status ) { |
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280 | |
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281 | if ( status == EINVAL ) { /* name -> ID translation failed */ |
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282 | if ( !(oflag & O_CREAT) ) { /* willing to create it? */ |
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283 | set_errno_and_return_minus_one_cast( ENOENT, sem_t * ); |
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284 | } |
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285 | /* we are willing to create it */ |
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286 | } |
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287 | /* some type of error */ |
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288 | /*set_errno_and_return_minus_one_cast( status, sem_t * );*/ |
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289 | |
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290 | } else { /* name -> ID translation succeeded */ |
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291 | |
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292 | if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) { |
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293 | set_errno_and_return_minus_one_cast( EEXIST, sem_t * ); |
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294 | } |
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295 | |
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296 | /* |
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297 | * XXX In this case we need to do an ID->pointer conversion to |
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298 | * check the mode. This is probably a good place for a subroutine. |
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299 | */ |
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300 | |
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301 | the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location ); |
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302 | the_semaphore->open_count += 1; |
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303 | |
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304 | return (sem_t *)&the_semaphore->Object.id; |
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305 | |
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306 | } |
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307 | |
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308 | /* XXX verify this comment... |
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309 | * |
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310 | * At this point, the semaphore does not exist and everything has been |
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311 | * checked. We should go ahead and create a semaphore. |
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312 | */ |
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313 | |
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314 | status = _POSIX_Semaphore_Create_support( |
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315 | name, |
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316 | FALSE, /* not shared across processes */ |
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317 | value, |
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318 | &the_semaphore |
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319 | ); |
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320 | |
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321 | if ( status == -1 ) |
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322 | return (sem_t *) -1; |
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323 | |
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324 | return (sem_t *) &the_semaphore->Object.id; |
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325 | |
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326 | } |
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327 | |
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328 | /*PAGE |
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329 | * |
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330 | * _POSIX_Semaphore_Delete |
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331 | */ |
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332 | |
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333 | void _POSIX_Semaphore_Delete( |
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334 | POSIX_Semaphore_Control *the_semaphore |
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335 | ) |
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336 | { |
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337 | if ( !the_semaphore->linked && !the_semaphore->open_count ) { |
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338 | _POSIX_Semaphore_Free( the_semaphore ); |
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339 | |
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340 | #if defined(RTEMS_MULTIPROCESSING) |
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341 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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342 | |
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343 | _Objects_MP_Close( |
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344 | &_POSIX_Semaphore_Information, |
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345 | the_semaphore->Object.id |
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346 | ); |
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347 | |
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348 | _POSIX_Semaphore_MP_Send_process_packet( |
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349 | POSIX_SEMAPHORE_MP_ANNOUNCE_DELETE, |
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350 | the_semaphore->Object.id, |
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351 | 0, /* Not used */ |
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352 | 0 /* Not used */ |
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353 | ); |
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354 | } |
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355 | #endif |
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356 | |
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357 | } |
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358 | } |
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359 | |
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360 | /*PAGE |
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361 | * |
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362 | * 11.2.4 Close a Named Semaphore, P1003.1b-1993, p.224 |
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363 | */ |
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364 | |
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365 | int sem_close( |
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366 | sem_t *sem |
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367 | ) |
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368 | { |
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369 | register POSIX_Semaphore_Control *the_semaphore; |
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370 | Objects_Locations location; |
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371 | |
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372 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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373 | switch ( location ) { |
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374 | case OBJECTS_ERROR: |
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375 | set_errno_and_return_minus_one( EINVAL ); |
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376 | case OBJECTS_REMOTE: |
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377 | _Thread_Dispatch(); |
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378 | return POSIX_MP_NOT_IMPLEMENTED(); |
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379 | set_errno_and_return_minus_one( EINVAL ); |
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380 | case OBJECTS_LOCAL: |
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381 | the_semaphore->open_count -= 1; |
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382 | _POSIX_Semaphore_Delete( the_semaphore ); |
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383 | _Thread_Enable_dispatch(); |
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384 | return 0; |
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385 | } |
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386 | return POSIX_BOTTOM_REACHED(); |
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387 | } |
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388 | |
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389 | /*PAGE |
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390 | * |
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391 | * 11.2.5 Remove a Named Semaphore, P1003.1b-1993, p.225 |
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392 | */ |
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393 | |
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394 | int sem_unlink( |
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395 | const char *name |
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396 | ) |
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397 | { |
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398 | int status; |
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399 | register POSIX_Semaphore_Control *the_semaphore; |
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400 | Objects_Id the_semaphore_id; |
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401 | Objects_Locations location; |
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402 | |
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403 | status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id ); |
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404 | |
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405 | if ( !status ) |
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406 | set_errno_and_return_minus_one( status ); |
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407 | |
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408 | the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location ); |
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409 | switch ( location ) { |
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410 | case OBJECTS_ERROR: |
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411 | set_errno_and_return_minus_one( EINVAL ); |
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412 | case OBJECTS_REMOTE: |
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413 | _Thread_Dispatch(); |
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414 | return POSIX_MP_NOT_IMPLEMENTED(); |
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415 | set_errno_and_return_minus_one( EINVAL ); |
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416 | case OBJECTS_LOCAL: |
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417 | |
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418 | #if defined(RTEMS_MULTIPROCESSING) |
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419 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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420 | _Objects_MP_Close( |
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421 | &_POSIX_Semaphore_Information, |
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422 | the_semaphore->Object.id |
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423 | ); |
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424 | } |
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425 | #endif |
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426 | |
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427 | the_semaphore->linked = FALSE; |
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428 | |
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429 | _POSIX_Semaphore_Delete( the_semaphore ); |
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430 | |
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431 | _Thread_Enable_dispatch(); |
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432 | return 0; |
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433 | } |
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434 | return POSIX_BOTTOM_REACHED(); |
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435 | } |
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436 | |
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437 | /*PAGE |
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438 | * |
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439 | * _POSIX_Semaphore_Wait_support |
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440 | */ |
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441 | |
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442 | int _POSIX_Semaphore_Wait_support( |
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443 | sem_t *sem, |
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444 | boolean blocking, |
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445 | Watchdog_Interval timeout |
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446 | ) |
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447 | { |
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448 | register POSIX_Semaphore_Control *the_semaphore; |
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449 | Objects_Locations location; |
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450 | int code; |
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451 | |
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452 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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453 | switch ( location ) { |
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454 | case OBJECTS_ERROR: |
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455 | set_errno_and_return_minus_one( EINVAL ); |
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456 | case OBJECTS_REMOTE: |
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457 | _Thread_Dispatch(); |
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458 | return POSIX_MP_NOT_IMPLEMENTED(); |
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459 | set_errno_and_return_minus_one( EINVAL ); |
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460 | case OBJECTS_LOCAL: |
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461 | _CORE_semaphore_Seize( |
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462 | &the_semaphore->Semaphore, |
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463 | the_semaphore->Object.id, |
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464 | blocking, |
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465 | timeout |
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466 | ); |
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467 | _Thread_Enable_dispatch(); |
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468 | code = _Thread_Executing->Wait.return_code; |
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469 | switch (_Thread_Executing->Wait.return_code) { |
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470 | case 1: |
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471 | errno = EAGAIN; |
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472 | code = -1; |
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473 | break; |
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474 | case 3: |
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475 | errno = ETIMEDOUT; |
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476 | code = -1; |
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477 | break; |
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478 | } |
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479 | |
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480 | /*return _Thread_Executing->Wait.return_code;*/ |
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481 | return code; |
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482 | } |
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483 | return POSIX_BOTTOM_REACHED(); |
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484 | } |
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485 | |
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486 | /*PAGE |
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487 | * |
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488 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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489 | * |
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490 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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491 | */ |
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492 | |
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493 | int sem_wait( |
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494 | sem_t *sem |
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495 | ) |
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496 | { |
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497 | return _POSIX_Semaphore_Wait_support( sem, TRUE, THREAD_QUEUE_WAIT_FOREVER ); |
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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 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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503 | * |
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504 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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505 | */ |
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506 | |
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507 | int sem_trywait( |
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508 | sem_t *sem |
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509 | ) |
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510 | { |
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511 | return _POSIX_Semaphore_Wait_support( sem, FALSE, THREAD_QUEUE_WAIT_FOREVER ); |
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512 | } |
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513 | |
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514 | /*PAGE |
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515 | * |
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516 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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517 | * |
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518 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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519 | */ |
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520 | |
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521 | int sem_timedwait( |
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522 | sem_t *sem, |
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523 | const struct timespec *timeout |
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524 | ) |
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525 | { |
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526 | return _POSIX_Semaphore_Wait_support( |
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527 | sem, |
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528 | TRUE, |
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529 | _POSIX_Timespec_to_interval( timeout ) |
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530 | ); |
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531 | } |
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532 | |
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533 | /*PAGE |
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534 | * |
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535 | * 11.2.7 Unlock a Semaphore, P1003.1b-1993, p.227 |
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536 | */ |
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537 | |
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538 | void POSIX_Semaphore_MP_support( |
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539 | Thread_Control *the_thread, |
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540 | Objects_Id id |
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541 | ) |
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542 | { |
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543 | (void) POSIX_MP_NOT_IMPLEMENTED(); |
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544 | } |
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545 | |
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546 | |
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547 | int sem_post( |
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548 | sem_t *sem |
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549 | ) |
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550 | { |
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551 | register POSIX_Semaphore_Control *the_semaphore; |
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552 | Objects_Locations location; |
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553 | |
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554 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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555 | switch ( location ) { |
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556 | case OBJECTS_ERROR: |
---|
557 | set_errno_and_return_minus_one( EINVAL ); |
---|
558 | case OBJECTS_REMOTE: |
---|
559 | _Thread_Dispatch(); |
---|
560 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
561 | set_errno_and_return_minus_one( EINVAL ); |
---|
562 | case OBJECTS_LOCAL: |
---|
563 | _CORE_semaphore_Surrender( |
---|
564 | &the_semaphore->Semaphore, |
---|
565 | the_semaphore->Object.id, |
---|
566 | #if defined(RTEMS_MULTIPROCESSING) |
---|
567 | POSIX_Semaphore_MP_support |
---|
568 | #else |
---|
569 | NULL |
---|
570 | #endif |
---|
571 | ); |
---|
572 | _Thread_Enable_dispatch(); |
---|
573 | return 0; |
---|
574 | } |
---|
575 | return POSIX_BOTTOM_REACHED(); |
---|
576 | } |
---|
577 | |
---|
578 | /*PAGE |
---|
579 | * |
---|
580 | * 11.2.8 Get the Value of a Semaphore, P1003.1b-1993, p.229 |
---|
581 | */ |
---|
582 | |
---|
583 | int sem_getvalue( |
---|
584 | sem_t *sem, |
---|
585 | int *sval |
---|
586 | ) |
---|
587 | { |
---|
588 | register POSIX_Semaphore_Control *the_semaphore; |
---|
589 | Objects_Locations location; |
---|
590 | |
---|
591 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
---|
592 | switch ( location ) { |
---|
593 | case OBJECTS_ERROR: |
---|
594 | set_errno_and_return_minus_one( EINVAL ); |
---|
595 | case OBJECTS_REMOTE: |
---|
596 | _Thread_Dispatch(); |
---|
597 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
598 | set_errno_and_return_minus_one( EINVAL ); |
---|
599 | case OBJECTS_LOCAL: |
---|
600 | *sval = _CORE_semaphore_Get_count( &the_semaphore->Semaphore ); |
---|
601 | _Thread_Enable_dispatch(); |
---|
602 | return 0; |
---|
603 | } |
---|
604 | return POSIX_BOTTOM_REACHED(); |
---|
605 | } |
---|
606 | |
---|
607 | /*PAGE |
---|
608 | * |
---|
609 | * _POSIX_Semaphore_Name_to_id |
---|
610 | * |
---|
611 | * XXX |
---|
612 | */ |
---|
613 | |
---|
614 | int _POSIX_Semaphore_Name_to_id( |
---|
615 | const char *name, |
---|
616 | Objects_Id *id |
---|
617 | ) |
---|
618 | { |
---|
619 | Objects_Name_to_id_errors status; |
---|
620 | |
---|
621 | status = _Objects_Name_to_id( &_POSIX_Semaphore_Information, (char *)name, 0, id ); |
---|
622 | |
---|
623 | if ( status == OBJECTS_SUCCESSFUL ) { |
---|
624 | return 0; |
---|
625 | } else { |
---|
626 | return EINVAL; |
---|
627 | } |
---|
628 | } |
---|
629 | |
---|