[5e9b32b] | 1 | /* mutex.c |
---|
| 2 | * |
---|
[eb5a7e07] | 3 | * $Id$ |
---|
[5e9b32b] | 4 | */ |
---|
| 5 | |
---|
| 6 | #include <errno.h> |
---|
| 7 | #include <pthread.h> |
---|
| 8 | |
---|
| 9 | #include <rtems/score/system.h> |
---|
| 10 | #include <rtems/score/coremutex.h> |
---|
| 11 | #include <rtems/score/watchdog.h> |
---|
| 12 | #include <rtems/score/mpci.h> |
---|
| 13 | |
---|
| 14 | #include <rtems/posix/mutex.h> |
---|
| 15 | #include <rtems/posix/priority.h> |
---|
| 16 | #include <rtems/posix/time.h> |
---|
| 17 | |
---|
| 18 | /*PAGE |
---|
| 19 | * |
---|
| 20 | * The default mutex attributes structure. |
---|
| 21 | */ |
---|
| 22 | |
---|
| 23 | const pthread_mutexattr_t _POSIX_Mutex_Default_attributes = { |
---|
| 24 | TRUE, /* is_initialized */ |
---|
| 25 | PTHREAD_PROCESS_PRIVATE, /* process_shared */ |
---|
| 26 | POSIX_SCHEDULER_MINIMUM_PRIORITY, /* prio_ceiling */ |
---|
| 27 | PTHREAD_PRIO_NONE, /* protocol */ |
---|
| 28 | FALSE /* recursive */ |
---|
| 29 | }; |
---|
| 30 | |
---|
| 31 | /*PAGE |
---|
| 32 | * |
---|
| 33 | * _POSIX_Mutex_Manager_initialization |
---|
| 34 | * |
---|
| 35 | * This routine initializes all mutex manager related data structures. |
---|
| 36 | * |
---|
| 37 | * Input parameters: |
---|
| 38 | * maximum_mutexes - maximum configured mutexes |
---|
| 39 | * |
---|
| 40 | * Output parameters: NONE |
---|
| 41 | */ |
---|
| 42 | |
---|
| 43 | void _POSIX_Mutex_Manager_initialization( |
---|
| 44 | unsigned32 maximum_mutexes |
---|
| 45 | ) |
---|
| 46 | { |
---|
| 47 | _Objects_Initialize_information( |
---|
| 48 | &_POSIX_Mutex_Information, |
---|
| 49 | OBJECTS_POSIX_MUTEXES, |
---|
| 50 | TRUE, |
---|
| 51 | maximum_mutexes, |
---|
| 52 | sizeof( POSIX_Mutex_Control ), |
---|
| 53 | FALSE, |
---|
| 54 | 0, |
---|
| 55 | FALSE |
---|
| 56 | ); |
---|
| 57 | } |
---|
| 58 | |
---|
| 59 | /*PAGE |
---|
| 60 | * |
---|
| 61 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
---|
| 62 | */ |
---|
| 63 | |
---|
| 64 | int pthread_mutexattr_init( |
---|
| 65 | pthread_mutexattr_t *attr |
---|
| 66 | ) |
---|
| 67 | { |
---|
| 68 | if ( !attr ) |
---|
| 69 | return EINVAL; |
---|
| 70 | |
---|
| 71 | *attr = _POSIX_Mutex_Default_attributes; |
---|
| 72 | return 0; |
---|
| 73 | } |
---|
| 74 | |
---|
| 75 | /*PAGE |
---|
| 76 | * |
---|
| 77 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
---|
| 78 | */ |
---|
| 79 | |
---|
| 80 | int pthread_mutexattr_destroy( |
---|
| 81 | pthread_mutexattr_t *attr |
---|
| 82 | ) |
---|
| 83 | { |
---|
| 84 | if ( !attr || attr->is_initialized == FALSE ) |
---|
| 85 | return EINVAL; |
---|
| 86 | |
---|
| 87 | attr->is_initialized = FALSE; |
---|
| 88 | return 0; |
---|
| 89 | } |
---|
| 90 | |
---|
| 91 | /*PAGE |
---|
| 92 | * |
---|
| 93 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
---|
| 94 | */ |
---|
| 95 | |
---|
| 96 | int pthread_mutexattr_getpshared( |
---|
| 97 | const pthread_mutexattr_t *attr, |
---|
| 98 | int *pshared |
---|
| 99 | ) |
---|
| 100 | { |
---|
| 101 | if ( !attr ) |
---|
| 102 | return EINVAL; |
---|
| 103 | |
---|
| 104 | *pshared = attr->process_shared; |
---|
| 105 | return 0; |
---|
| 106 | } |
---|
| 107 | |
---|
| 108 | /*PAGE |
---|
| 109 | * |
---|
| 110 | * 11.3.1 Mutex Initialization Attributes, P1003.1c/Draft 10, p. 81 |
---|
| 111 | */ |
---|
| 112 | |
---|
| 113 | int pthread_mutexattr_setpshared( |
---|
| 114 | pthread_mutexattr_t *attr, |
---|
| 115 | int pshared |
---|
| 116 | ) |
---|
| 117 | { |
---|
| 118 | if ( !attr ) |
---|
| 119 | return EINVAL; |
---|
| 120 | |
---|
| 121 | attr->process_shared = pshared; |
---|
| 122 | return 0; |
---|
| 123 | } |
---|
| 124 | |
---|
| 125 | /*PAGE |
---|
| 126 | * |
---|
| 127 | * 11.3.2 Initializing and Destroying a Mutex, P1003.1c/Draft 10, p. 87 |
---|
| 128 | * |
---|
| 129 | * NOTE: XXX Could be optimized so all the attribute error checking |
---|
| 130 | * is not performed when attr is NULL. |
---|
| 131 | */ |
---|
| 132 | |
---|
| 133 | int pthread_mutex_init( |
---|
| 134 | pthread_mutex_t *mutex, |
---|
| 135 | const pthread_mutexattr_t *attr |
---|
| 136 | ) |
---|
| 137 | { |
---|
| 138 | POSIX_Mutex_Control *the_mutex; |
---|
| 139 | CORE_mutex_Attributes *the_mutex_attr; |
---|
| 140 | const pthread_mutexattr_t *the_attr; |
---|
| 141 | CORE_mutex_Disciplines the_discipline; |
---|
| 142 | |
---|
| 143 | if ( attr ) the_attr = attr; |
---|
| 144 | else the_attr = &_POSIX_Mutex_Default_attributes; |
---|
| 145 | |
---|
| 146 | /* |
---|
| 147 | * XXX: Be careful about attributes when global!!! |
---|
| 148 | */ |
---|
| 149 | |
---|
| 150 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
---|
| 151 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
| 152 | |
---|
| 153 | if ( !the_attr->is_initialized ) |
---|
| 154 | return EINVAL; |
---|
| 155 | |
---|
| 156 | /* |
---|
| 157 | * Determine the discipline of the mutex |
---|
| 158 | */ |
---|
| 159 | |
---|
| 160 | switch ( the_attr->protocol ) { |
---|
| 161 | case PTHREAD_PRIO_NONE: |
---|
| 162 | the_discipline = CORE_MUTEX_DISCIPLINES_FIFO; |
---|
| 163 | break; |
---|
| 164 | case PTHREAD_PRIO_INHERIT: |
---|
| 165 | the_discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT; |
---|
| 166 | break; |
---|
| 167 | case PTHREAD_PRIO_PROTECT: |
---|
| 168 | the_discipline = CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING; |
---|
| 169 | break; |
---|
| 170 | default: |
---|
| 171 | return EINVAL; |
---|
| 172 | } |
---|
| 173 | |
---|
| 174 | if ( !_POSIX_Priority_Is_valid( the_attr->prio_ceiling ) ) |
---|
| 175 | return EINVAL; |
---|
| 176 | |
---|
| 177 | _Thread_Disable_dispatch(); |
---|
| 178 | |
---|
| 179 | the_mutex = _POSIX_Mutex_Allocate(); |
---|
| 180 | |
---|
| 181 | if ( !the_mutex ) { |
---|
| 182 | _Thread_Enable_dispatch(); |
---|
| 183 | return ENOMEM; |
---|
| 184 | } |
---|
| 185 | |
---|
| 186 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED && |
---|
| 187 | !( _Objects_MP_Allocate_and_open( &_POSIX_Mutex_Information, 0, |
---|
| 188 | the_mutex->Object.id, FALSE ) ) ) { |
---|
| 189 | _POSIX_Mutex_Free( the_mutex ); |
---|
| 190 | _Thread_Enable_dispatch(); |
---|
| 191 | return EAGAIN; |
---|
| 192 | } |
---|
| 193 | |
---|
| 194 | the_mutex->process_shared = the_attr->process_shared; |
---|
| 195 | |
---|
| 196 | the_mutex_attr = &the_mutex->Mutex.Attributes; |
---|
| 197 | |
---|
| 198 | the_mutex_attr->allow_nesting = the_attr->recursive; |
---|
| 199 | the_mutex_attr->priority_ceiling = |
---|
| 200 | _POSIX_Priority_To_core( the_attr->prio_ceiling ); |
---|
| 201 | the_mutex_attr->discipline = the_discipline; |
---|
| 202 | |
---|
| 203 | /* |
---|
| 204 | * Must be initialized to unlocked. |
---|
| 205 | */ |
---|
| 206 | |
---|
| 207 | _CORE_mutex_Initialize( |
---|
| 208 | &the_mutex->Mutex, |
---|
| 209 | OBJECTS_POSIX_MUTEXES, |
---|
| 210 | the_mutex_attr, |
---|
| 211 | CORE_MUTEX_UNLOCKED, |
---|
| 212 | 0 /* XXX proxy_extract_callout */ |
---|
| 213 | ); |
---|
| 214 | |
---|
| 215 | _Objects_Open( &_POSIX_Mutex_Information, &the_mutex->Object, 0 ); |
---|
| 216 | |
---|
| 217 | *mutex = the_mutex->Object.id; |
---|
| 218 | |
---|
| 219 | if ( the_attr->process_shared == PTHREAD_PROCESS_SHARED ) |
---|
| 220 | _POSIX_Mutex_MP_Send_process_packet( |
---|
| 221 | POSIX_MUTEX_MP_ANNOUNCE_CREATE, |
---|
| 222 | the_mutex->Object.id, |
---|
| 223 | 0, /* Name not used */ |
---|
| 224 | 0 /* Not used */ |
---|
| 225 | ); |
---|
| 226 | |
---|
| 227 | _Thread_Enable_dispatch(); |
---|
| 228 | return 0; |
---|
| 229 | } |
---|
| 230 | |
---|
| 231 | /*PAGE |
---|
| 232 | * |
---|
| 233 | * 11.3.2 Initializing and Destroying a Mutex, P1003.1c/Draft 10, p. 87 |
---|
| 234 | */ |
---|
| 235 | |
---|
| 236 | int pthread_mutex_destroy( |
---|
| 237 | pthread_mutex_t *mutex |
---|
| 238 | ) |
---|
| 239 | { |
---|
| 240 | register POSIX_Mutex_Control *the_mutex; |
---|
| 241 | Objects_Locations location; |
---|
| 242 | |
---|
| 243 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
---|
| 244 | switch ( location ) { |
---|
| 245 | case OBJECTS_ERROR: |
---|
| 246 | return EINVAL; |
---|
| 247 | case OBJECTS_REMOTE: |
---|
| 248 | _Thread_Dispatch(); |
---|
| 249 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
| 250 | return EINVAL; |
---|
| 251 | case OBJECTS_LOCAL: |
---|
| 252 | /* |
---|
| 253 | * XXX: There is an error for the mutex being locked |
---|
| 254 | * or being in use by a condition variable. |
---|
| 255 | */ |
---|
| 256 | |
---|
| 257 | if ( _CORE_mutex_Is_locked( &the_mutex->Mutex ) ) { |
---|
| 258 | _Thread_Enable_dispatch(); |
---|
| 259 | return EBUSY; |
---|
| 260 | } |
---|
| 261 | |
---|
| 262 | _Objects_Close( &_POSIX_Mutex_Information, &the_mutex->Object ); |
---|
| 263 | |
---|
| 264 | _CORE_mutex_Flush( |
---|
| 265 | &the_mutex->Mutex, |
---|
| 266 | _POSIX_Mutex_MP_Send_object_was_deleted, |
---|
| 267 | EINVAL |
---|
| 268 | ); |
---|
| 269 | |
---|
| 270 | _POSIX_Mutex_Free( the_mutex ); |
---|
| 271 | |
---|
| 272 | if ( the_mutex->process_shared == PTHREAD_PROCESS_SHARED ) { |
---|
| 273 | |
---|
| 274 | _Objects_MP_Close( &_POSIX_Mutex_Information, the_mutex->Object.id ); |
---|
| 275 | |
---|
| 276 | _POSIX_Mutex_MP_Send_process_packet( |
---|
| 277 | POSIX_MUTEX_MP_ANNOUNCE_DELETE, |
---|
| 278 | the_mutex->Object.id, |
---|
| 279 | 0, /* Not used */ |
---|
| 280 | 0 /* Not used */ |
---|
| 281 | ); |
---|
| 282 | } |
---|
| 283 | _Thread_Enable_dispatch(); |
---|
| 284 | return 0; |
---|
| 285 | } |
---|
| 286 | return POSIX_BOTTOM_REACHED(); |
---|
| 287 | } |
---|
| 288 | |
---|
| 289 | /* |
---|
| 290 | * _POSIX_Mutex_Lock_support |
---|
| 291 | * |
---|
| 292 | * A support routine which implements guts of the blocking, non-blocking, and |
---|
| 293 | * timed wait version of mutex lock. |
---|
| 294 | */ |
---|
| 295 | |
---|
| 296 | int _POSIX_Mutex_Lock_support( |
---|
| 297 | pthread_mutex_t *mutex, |
---|
| 298 | boolean blocking, |
---|
| 299 | Watchdog_Interval timeout |
---|
| 300 | ) |
---|
| 301 | { |
---|
| 302 | register POSIX_Mutex_Control *the_mutex; |
---|
| 303 | Objects_Locations location; |
---|
| 304 | |
---|
| 305 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
---|
| 306 | switch ( location ) { |
---|
| 307 | case OBJECTS_ERROR: |
---|
| 308 | return EINVAL; |
---|
| 309 | case OBJECTS_REMOTE: |
---|
| 310 | return _POSIX_Mutex_MP_Send_request_packet( |
---|
| 311 | POSIX_MUTEX_MP_OBTAIN_REQUEST, |
---|
| 312 | *mutex, |
---|
| 313 | 0, /* must define the option set */ |
---|
| 314 | WATCHDOG_NO_TIMEOUT |
---|
| 315 | ); |
---|
| 316 | case OBJECTS_LOCAL: |
---|
| 317 | _CORE_mutex_Seize( |
---|
| 318 | &the_mutex->Mutex, |
---|
| 319 | the_mutex->Object.id, |
---|
| 320 | blocking, |
---|
| 321 | timeout |
---|
| 322 | ); |
---|
| 323 | _Thread_Enable_dispatch(); |
---|
| 324 | return _Thread_Executing->Wait.return_code; |
---|
| 325 | break; |
---|
| 326 | } |
---|
| 327 | return POSIX_BOTTOM_REACHED(); |
---|
| 328 | } |
---|
| 329 | |
---|
| 330 | /*PAGE |
---|
| 331 | * |
---|
| 332 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
---|
| 333 | * |
---|
| 334 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
---|
| 335 | */ |
---|
| 336 | |
---|
| 337 | int pthread_mutex_lock( |
---|
| 338 | pthread_mutex_t *mutex |
---|
| 339 | ) |
---|
| 340 | { |
---|
| 341 | return _POSIX_Mutex_Lock_support( mutex, TRUE, THREAD_QUEUE_WAIT_FOREVER ); |
---|
| 342 | } |
---|
| 343 | |
---|
| 344 | /*PAGE |
---|
| 345 | * |
---|
| 346 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
---|
| 347 | * |
---|
| 348 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
---|
| 349 | */ |
---|
| 350 | |
---|
| 351 | int pthread_mutex_trylock( |
---|
| 352 | pthread_mutex_t *mutex |
---|
| 353 | ) |
---|
| 354 | { |
---|
| 355 | return _POSIX_Mutex_Lock_support( mutex, FALSE, THREAD_QUEUE_WAIT_FOREVER ); |
---|
| 356 | } |
---|
| 357 | |
---|
| 358 | /*PAGE |
---|
| 359 | * |
---|
| 360 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
---|
| 361 | * |
---|
| 362 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
---|
| 363 | */ |
---|
| 364 | |
---|
| 365 | void POSIX_Threads_mutex_MP_support( |
---|
| 366 | Thread_Control *the_thread, |
---|
| 367 | Objects_Id id |
---|
| 368 | ) |
---|
| 369 | { |
---|
| 370 | (void) POSIX_MP_NOT_IMPLEMENTED(); /* XXX: should never get here */ |
---|
| 371 | } |
---|
| 372 | |
---|
| 373 | int pthread_mutex_unlock( |
---|
| 374 | pthread_mutex_t *mutex |
---|
| 375 | ) |
---|
| 376 | { |
---|
| 377 | register POSIX_Mutex_Control *the_mutex; |
---|
| 378 | Objects_Locations location; |
---|
| 379 | |
---|
| 380 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
---|
| 381 | switch ( location ) { |
---|
| 382 | case OBJECTS_ERROR: |
---|
| 383 | return EINVAL; |
---|
| 384 | case OBJECTS_REMOTE: |
---|
| 385 | return _POSIX_Mutex_MP_Send_request_packet( |
---|
| 386 | POSIX_MUTEX_MP_RELEASE_REQUEST, |
---|
| 387 | *mutex, |
---|
| 388 | 0, /* Not used */ |
---|
| 389 | MPCI_DEFAULT_TIMEOUT |
---|
| 390 | ); |
---|
| 391 | case OBJECTS_LOCAL: |
---|
| 392 | _CORE_mutex_Surrender( |
---|
| 393 | &the_mutex->Mutex, |
---|
| 394 | the_mutex->Object.id, |
---|
| 395 | POSIX_Threads_mutex_MP_support |
---|
| 396 | ); |
---|
| 397 | _Thread_Enable_dispatch(); |
---|
| 398 | return _Thread_Executing->Wait.return_code; /* XXX return status */ |
---|
| 399 | break; |
---|
| 400 | } |
---|
| 401 | return POSIX_BOTTOM_REACHED(); |
---|
| 402 | } |
---|
| 403 | |
---|
| 404 | /*PAGE |
---|
| 405 | * |
---|
| 406 | * 11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93 |
---|
| 407 | * |
---|
| 408 | * NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29 |
---|
| 409 | */ |
---|
| 410 | |
---|
| 411 | int pthread_mutex_timedlock( |
---|
| 412 | pthread_mutex_t *mutex, |
---|
| 413 | const struct timespec *timeout |
---|
| 414 | ) |
---|
| 415 | { |
---|
| 416 | return _POSIX_Mutex_Lock_support( |
---|
| 417 | mutex, |
---|
| 418 | TRUE, |
---|
| 419 | _POSIX_Time_Spec_to_interval( timeout ) |
---|
| 420 | ); |
---|
| 421 | } |
---|
| 422 | |
---|
| 423 | /*PAGE |
---|
| 424 | * |
---|
| 425 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
---|
| 426 | */ |
---|
| 427 | |
---|
| 428 | int pthread_mutexattr_setprotocol( |
---|
| 429 | pthread_mutexattr_t *attr, |
---|
| 430 | int protocol |
---|
| 431 | ) |
---|
| 432 | { |
---|
| 433 | if ( !attr ) |
---|
| 434 | return EINVAL; |
---|
| 435 | |
---|
| 436 | attr->protocol = protocol; |
---|
| 437 | return 0; |
---|
| 438 | } |
---|
| 439 | |
---|
| 440 | /*PAGE |
---|
| 441 | * |
---|
| 442 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
---|
| 443 | */ |
---|
| 444 | |
---|
| 445 | int pthread_mutexattr_getprotocol( |
---|
| 446 | const pthread_mutexattr_t *attr, |
---|
| 447 | int *protocol |
---|
| 448 | ) |
---|
| 449 | { |
---|
| 450 | if ( !attr ) |
---|
| 451 | return EINVAL; |
---|
| 452 | |
---|
| 453 | *protocol = attr->protocol; |
---|
| 454 | return 0; |
---|
| 455 | } |
---|
| 456 | |
---|
| 457 | /*PAGE |
---|
| 458 | * |
---|
| 459 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
---|
| 460 | */ |
---|
| 461 | |
---|
| 462 | int pthread_mutexattr_setprioceiling( |
---|
| 463 | pthread_mutexattr_t *attr, |
---|
| 464 | int prioceiling |
---|
| 465 | ) |
---|
| 466 | { |
---|
| 467 | if ( !attr ) |
---|
| 468 | return EINVAL; |
---|
| 469 | |
---|
| 470 | if ( !_POSIX_Priority_Is_valid( attr->prio_ceiling ) ) |
---|
| 471 | return EINVAL; |
---|
| 472 | |
---|
| 473 | attr->prio_ceiling = prioceiling; |
---|
| 474 | return 0; |
---|
| 475 | } |
---|
| 476 | |
---|
| 477 | /*PAGE |
---|
| 478 | * |
---|
| 479 | * 13.6.1 Mutex Initialization Scheduling Attributes, P1003.1c/Draft 10, p. 128 |
---|
| 480 | */ |
---|
| 481 | |
---|
| 482 | int pthread_mutexattr_getprioceiling( |
---|
| 483 | const pthread_mutexattr_t *attr, |
---|
| 484 | int *prioceiling |
---|
| 485 | ) |
---|
| 486 | { |
---|
| 487 | if ( !attr ) |
---|
| 488 | return EINVAL; |
---|
| 489 | |
---|
| 490 | *prioceiling = attr->prio_ceiling; |
---|
| 491 | return 0; |
---|
| 492 | } |
---|
| 493 | |
---|
| 494 | /*PAGE |
---|
| 495 | * |
---|
| 496 | * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 |
---|
| 497 | */ |
---|
| 498 | |
---|
| 499 | int pthread_mutex_setprioceiling( |
---|
| 500 | pthread_mutex_t *mutex, |
---|
| 501 | int prioceiling, |
---|
| 502 | int *old_ceiling |
---|
| 503 | ) |
---|
| 504 | { |
---|
| 505 | register POSIX_Mutex_Control *the_mutex; |
---|
| 506 | Objects_Locations location; |
---|
| 507 | Priority_Control the_priority; |
---|
| 508 | int status; |
---|
| 509 | |
---|
| 510 | if ( !_POSIX_Priority_Is_valid( prioceiling ) ) |
---|
| 511 | return EINVAL; |
---|
| 512 | |
---|
| 513 | the_priority = _POSIX_Priority_To_core( prioceiling ); |
---|
| 514 | |
---|
| 515 | /* |
---|
| 516 | * Must acquire the mutex before we can change it's ceiling |
---|
| 517 | */ |
---|
| 518 | |
---|
| 519 | status = pthread_mutex_lock( mutex ); |
---|
| 520 | if ( status ) |
---|
| 521 | return status; |
---|
| 522 | |
---|
| 523 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
---|
| 524 | switch ( location ) { |
---|
| 525 | case OBJECTS_ERROR: |
---|
| 526 | return EINVAL; |
---|
| 527 | case OBJECTS_REMOTE: |
---|
| 528 | return POSIX_MP_NOT_IMPLEMENTED(); /* XXX feels questionable */ |
---|
| 529 | return EINVAL; |
---|
| 530 | case OBJECTS_LOCAL: |
---|
| 531 | the_mutex->Mutex.Attributes.priority_ceiling = the_priority; |
---|
| 532 | _CORE_mutex_Surrender( |
---|
| 533 | &the_mutex->Mutex, |
---|
| 534 | the_mutex->Object.id, |
---|
| 535 | POSIX_Threads_mutex_MP_support |
---|
| 536 | ); |
---|
| 537 | _Thread_Enable_dispatch(); |
---|
| 538 | return 0; |
---|
| 539 | } |
---|
| 540 | return POSIX_BOTTOM_REACHED(); |
---|
| 541 | } |
---|
| 542 | |
---|
| 543 | /*PAGE |
---|
| 544 | * |
---|
| 545 | * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 |
---|
| 546 | */ |
---|
| 547 | |
---|
| 548 | int pthread_mutex_getprioceiling( |
---|
| 549 | pthread_mutex_t *mutex, |
---|
| 550 | int *prioceiling |
---|
| 551 | ) |
---|
| 552 | { |
---|
| 553 | register POSIX_Mutex_Control *the_mutex; |
---|
| 554 | Objects_Locations location; |
---|
| 555 | |
---|
| 556 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
---|
| 557 | switch ( location ) { |
---|
| 558 | case OBJECTS_ERROR: |
---|
| 559 | return EINVAL; |
---|
| 560 | case OBJECTS_REMOTE: |
---|
| 561 | return POSIX_MP_NOT_IMPLEMENTED(); /* XXX feels questionable */ |
---|
| 562 | case OBJECTS_LOCAL: |
---|
| 563 | *prioceiling = _POSIX_Priority_From_core( |
---|
| 564 | the_mutex->Mutex.Attributes.priority_ceiling |
---|
| 565 | ); |
---|
| 566 | _Thread_Enable_dispatch(); |
---|
| 567 | return 0; |
---|
| 568 | } |
---|
| 569 | return POSIX_BOTTOM_REACHED(); |
---|
| 570 | } |
---|