Alexandre Lision | 8af73cb | 2013-12-10 14:11:20 -0500 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pj/lock.h> |
| 21 | #include <pj/os.h> |
| 22 | #include <pj/assert.h> |
| 23 | #include <pj/log.h> |
| 24 | #include <pj/pool.h> |
| 25 | #include <pj/string.h> |
| 26 | #include <pj/errno.h> |
| 27 | |
| 28 | #define THIS_FILE "lock.c" |
| 29 | |
| 30 | typedef void LOCK_OBJ; |
| 31 | |
| 32 | /* |
| 33 | * Lock structure. |
| 34 | */ |
| 35 | struct pj_lock_t |
| 36 | { |
| 37 | LOCK_OBJ *lock_object; |
| 38 | |
| 39 | pj_status_t (*acquire) (LOCK_OBJ*); |
| 40 | pj_status_t (*tryacquire) (LOCK_OBJ*); |
| 41 | pj_status_t (*release) (LOCK_OBJ*); |
| 42 | pj_status_t (*destroy) (LOCK_OBJ*); |
| 43 | }; |
| 44 | |
| 45 | typedef pj_status_t (*FPTR)(LOCK_OBJ*); |
| 46 | |
| 47 | /****************************************************************************** |
| 48 | * Implementation of lock object with mutex. |
| 49 | */ |
| 50 | static pj_lock_t mutex_lock_template = |
| 51 | { |
| 52 | NULL, |
| 53 | (FPTR) &pj_mutex_lock, |
| 54 | (FPTR) &pj_mutex_trylock, |
| 55 | (FPTR) &pj_mutex_unlock, |
| 56 | (FPTR) &pj_mutex_destroy |
| 57 | }; |
| 58 | |
| 59 | static pj_status_t create_mutex_lock( pj_pool_t *pool, |
| 60 | const char *name, |
| 61 | int type, |
| 62 | pj_lock_t **lock ) |
| 63 | { |
| 64 | pj_lock_t *p_lock; |
| 65 | pj_mutex_t *mutex; |
| 66 | pj_status_t rc; |
| 67 | |
| 68 | PJ_ASSERT_RETURN(pool && lock, PJ_EINVAL); |
| 69 | |
| 70 | p_lock = PJ_POOL_ALLOC_T(pool, pj_lock_t); |
| 71 | if (!p_lock) |
| 72 | return PJ_ENOMEM; |
| 73 | |
| 74 | pj_memcpy(p_lock, &mutex_lock_template, sizeof(pj_lock_t)); |
| 75 | rc = pj_mutex_create(pool, name, type, &mutex); |
| 76 | if (rc != PJ_SUCCESS) |
| 77 | return rc; |
| 78 | |
| 79 | p_lock->lock_object = mutex; |
| 80 | *lock = p_lock; |
| 81 | return PJ_SUCCESS; |
| 82 | } |
| 83 | |
| 84 | |
| 85 | PJ_DEF(pj_status_t) pj_lock_create_simple_mutex( pj_pool_t *pool, |
| 86 | const char *name, |
| 87 | pj_lock_t **lock ) |
| 88 | { |
| 89 | return create_mutex_lock(pool, name, PJ_MUTEX_SIMPLE, lock); |
| 90 | } |
| 91 | |
| 92 | PJ_DEF(pj_status_t) pj_lock_create_recursive_mutex( pj_pool_t *pool, |
| 93 | const char *name, |
| 94 | pj_lock_t **lock ) |
| 95 | { |
| 96 | return create_mutex_lock(pool, name, PJ_MUTEX_RECURSE, lock); |
| 97 | } |
| 98 | |
| 99 | |
| 100 | /****************************************************************************** |
| 101 | * Implementation of NULL lock object. |
| 102 | */ |
| 103 | static pj_status_t null_op(void *arg) |
| 104 | { |
| 105 | PJ_UNUSED_ARG(arg); |
| 106 | return PJ_SUCCESS; |
| 107 | } |
| 108 | |
| 109 | static pj_lock_t null_lock_template = |
| 110 | { |
| 111 | NULL, |
| 112 | &null_op, |
| 113 | &null_op, |
| 114 | &null_op, |
| 115 | &null_op |
| 116 | }; |
| 117 | |
| 118 | PJ_DEF(pj_status_t) pj_lock_create_null_mutex( pj_pool_t *pool, |
| 119 | const char *name, |
| 120 | pj_lock_t **lock ) |
| 121 | { |
| 122 | PJ_UNUSED_ARG(name); |
| 123 | PJ_UNUSED_ARG(pool); |
| 124 | |
| 125 | PJ_ASSERT_RETURN(lock, PJ_EINVAL); |
| 126 | |
| 127 | *lock = &null_lock_template; |
| 128 | return PJ_SUCCESS; |
| 129 | } |
| 130 | |
| 131 | |
| 132 | /****************************************************************************** |
| 133 | * Implementation of semaphore lock object. |
| 134 | */ |
| 135 | #if defined(PJ_HAS_SEMAPHORE) && PJ_HAS_SEMAPHORE != 0 |
| 136 | |
| 137 | static pj_lock_t sem_lock_template = |
| 138 | { |
| 139 | NULL, |
| 140 | (FPTR) &pj_sem_wait, |
| 141 | (FPTR) &pj_sem_trywait, |
| 142 | (FPTR) &pj_sem_post, |
| 143 | (FPTR) &pj_sem_destroy |
| 144 | }; |
| 145 | |
| 146 | PJ_DEF(pj_status_t) pj_lock_create_semaphore( pj_pool_t *pool, |
| 147 | const char *name, |
| 148 | unsigned initial, |
| 149 | unsigned max, |
| 150 | pj_lock_t **lock ) |
| 151 | { |
| 152 | pj_lock_t *p_lock; |
| 153 | pj_sem_t *sem; |
| 154 | pj_status_t rc; |
| 155 | |
| 156 | PJ_ASSERT_RETURN(pool && lock, PJ_EINVAL); |
| 157 | |
| 158 | p_lock = PJ_POOL_ALLOC_T(pool, pj_lock_t); |
| 159 | if (!p_lock) |
| 160 | return PJ_ENOMEM; |
| 161 | |
| 162 | pj_memcpy(p_lock, &sem_lock_template, sizeof(pj_lock_t)); |
| 163 | rc = pj_sem_create( pool, name, initial, max, &sem); |
| 164 | if (rc != PJ_SUCCESS) |
| 165 | return rc; |
| 166 | |
| 167 | p_lock->lock_object = sem; |
| 168 | *lock = p_lock; |
| 169 | |
| 170 | return PJ_SUCCESS; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | #endif /* PJ_HAS_SEMAPHORE */ |
| 175 | |
| 176 | |
| 177 | PJ_DEF(pj_status_t) pj_lock_acquire( pj_lock_t *lock ) |
| 178 | { |
| 179 | PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL); |
| 180 | return (*lock->acquire)(lock->lock_object); |
| 181 | } |
| 182 | |
| 183 | PJ_DEF(pj_status_t) pj_lock_tryacquire( pj_lock_t *lock ) |
| 184 | { |
| 185 | PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL); |
| 186 | return (*lock->tryacquire)(lock->lock_object); |
| 187 | } |
| 188 | |
| 189 | PJ_DEF(pj_status_t) pj_lock_release( pj_lock_t *lock ) |
| 190 | { |
| 191 | PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL); |
| 192 | return (*lock->release)(lock->lock_object); |
| 193 | } |
| 194 | |
| 195 | PJ_DEF(pj_status_t) pj_lock_destroy( pj_lock_t *lock ) |
| 196 | { |
| 197 | PJ_ASSERT_RETURN(lock != NULL, PJ_EINVAL); |
| 198 | return (*lock->destroy)(lock->lock_object); |
| 199 | } |
| 200 | |
| 201 | |
| 202 | /****************************************************************************** |
| 203 | * Group lock |
| 204 | */ |
| 205 | |
| 206 | /* Individual lock in the group lock */ |
| 207 | typedef struct grp_lock_item |
| 208 | { |
| 209 | PJ_DECL_LIST_MEMBER(struct grp_lock_item); |
| 210 | int prio; |
| 211 | pj_lock_t *lock; |
| 212 | |
| 213 | } grp_lock_item; |
| 214 | |
| 215 | /* Destroy callbacks */ |
| 216 | typedef struct grp_destroy_callback |
| 217 | { |
| 218 | PJ_DECL_LIST_MEMBER(struct grp_destroy_callback); |
| 219 | void *comp; |
| 220 | void (*handler)(void*); |
| 221 | } grp_destroy_callback; |
| 222 | |
| 223 | #if PJ_GRP_LOCK_DEBUG |
| 224 | /* Store each add_ref caller */ |
| 225 | typedef struct grp_lock_ref |
| 226 | { |
| 227 | PJ_DECL_LIST_MEMBER(struct grp_lock_ref); |
| 228 | const char *file; |
| 229 | int line; |
| 230 | } grp_lock_ref; |
| 231 | #endif |
| 232 | |
| 233 | /* The group lock */ |
| 234 | struct pj_grp_lock_t |
| 235 | { |
| 236 | pj_lock_t base; |
| 237 | |
| 238 | pj_pool_t *pool; |
| 239 | pj_atomic_t *ref_cnt; |
| 240 | pj_lock_t *own_lock; |
| 241 | |
| 242 | pj_thread_t *owner; |
| 243 | int owner_cnt; |
| 244 | |
| 245 | grp_lock_item lock_list; |
| 246 | grp_destroy_callback destroy_list; |
| 247 | |
| 248 | #if PJ_GRP_LOCK_DEBUG |
| 249 | grp_lock_ref ref_list; |
| 250 | grp_lock_ref ref_free_list; |
| 251 | #endif |
| 252 | }; |
| 253 | |
| 254 | |
| 255 | PJ_DEF(void) pj_grp_lock_config_default(pj_grp_lock_config *cfg) |
| 256 | { |
| 257 | pj_bzero(cfg, sizeof(*cfg)); |
| 258 | } |
| 259 | |
| 260 | static void grp_lock_set_owner_thread(pj_grp_lock_t *glock) |
| 261 | { |
| 262 | if (!glock->owner) { |
| 263 | glock->owner = pj_thread_this(); |
| 264 | glock->owner_cnt = 1; |
| 265 | } else { |
| 266 | pj_assert(glock->owner == pj_thread_this()); |
| 267 | glock->owner_cnt++; |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | static void grp_lock_unset_owner_thread(pj_grp_lock_t *glock) |
| 272 | { |
| 273 | pj_assert(glock->owner == pj_thread_this()); |
| 274 | pj_assert(glock->owner_cnt > 0); |
| 275 | if (--glock->owner_cnt <= 0) { |
| 276 | glock->owner = NULL; |
| 277 | glock->owner_cnt = 0; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | static pj_status_t grp_lock_acquire(LOCK_OBJ *p) |
| 282 | { |
| 283 | pj_grp_lock_t *glock = (pj_grp_lock_t*)p; |
| 284 | grp_lock_item *lck; |
| 285 | |
| 286 | pj_assert(pj_atomic_get(glock->ref_cnt) > 0); |
| 287 | |
| 288 | lck = glock->lock_list.next; |
| 289 | while (lck != &glock->lock_list) { |
| 290 | pj_lock_acquire(lck->lock); |
| 291 | lck = lck->next; |
| 292 | } |
| 293 | grp_lock_set_owner_thread(glock); |
| 294 | pj_grp_lock_add_ref(glock); |
| 295 | return PJ_SUCCESS; |
| 296 | } |
| 297 | |
| 298 | static pj_status_t grp_lock_tryacquire(LOCK_OBJ *p) |
| 299 | { |
| 300 | pj_grp_lock_t *glock = (pj_grp_lock_t*)p; |
| 301 | grp_lock_item *lck; |
| 302 | |
| 303 | pj_assert(pj_atomic_get(glock->ref_cnt) > 0); |
| 304 | |
| 305 | lck = glock->lock_list.next; |
| 306 | while (lck != &glock->lock_list) { |
| 307 | pj_status_t status = pj_lock_tryacquire(lck->lock); |
| 308 | if (status != PJ_SUCCESS) { |
| 309 | lck = lck->prev; |
| 310 | while (lck != &glock->lock_list) { |
| 311 | pj_lock_release(lck->lock); |
| 312 | lck = lck->prev; |
| 313 | } |
| 314 | return status; |
| 315 | } |
| 316 | lck = lck->next; |
| 317 | } |
| 318 | grp_lock_set_owner_thread(glock); |
| 319 | pj_grp_lock_add_ref(glock); |
| 320 | return PJ_SUCCESS; |
| 321 | } |
| 322 | |
| 323 | static pj_status_t grp_lock_release(LOCK_OBJ *p) |
| 324 | { |
| 325 | pj_grp_lock_t *glock = (pj_grp_lock_t*)p; |
| 326 | grp_lock_item *lck; |
| 327 | |
| 328 | grp_lock_unset_owner_thread(glock); |
| 329 | |
| 330 | lck = glock->lock_list.prev; |
| 331 | while (lck != &glock->lock_list) { |
| 332 | pj_lock_release(lck->lock); |
| 333 | lck = lck->prev; |
| 334 | } |
| 335 | return pj_grp_lock_dec_ref(glock); |
| 336 | } |
| 337 | |
| 338 | static pj_status_t grp_lock_destroy(LOCK_OBJ *p) |
| 339 | { |
| 340 | pj_grp_lock_t *glock = (pj_grp_lock_t*)p; |
| 341 | pj_pool_t *pool = glock->pool; |
| 342 | grp_lock_item *lck; |
| 343 | grp_destroy_callback *cb; |
| 344 | |
| 345 | if (!glock->pool) { |
| 346 | /* already destroyed?! */ |
| 347 | return PJ_EINVAL; |
| 348 | } |
| 349 | |
| 350 | /* Release all chained locks */ |
| 351 | lck = glock->lock_list.next; |
| 352 | while (lck != &glock->lock_list) { |
| 353 | if (lck->lock != glock->own_lock) { |
| 354 | int i; |
| 355 | for (i=0; i<glock->owner_cnt; ++i) |
| 356 | pj_lock_release(lck->lock); |
| 357 | } |
| 358 | lck = lck->next; |
| 359 | } |
| 360 | |
| 361 | /* Call callbacks */ |
| 362 | cb = glock->destroy_list.next; |
| 363 | while (cb != &glock->destroy_list) { |
| 364 | grp_destroy_callback *next = cb->next; |
| 365 | cb->handler(cb->comp); |
| 366 | cb = next; |
| 367 | } |
| 368 | |
| 369 | pj_lock_destroy(glock->own_lock); |
| 370 | pj_atomic_destroy(glock->ref_cnt); |
| 371 | glock->pool = NULL; |
| 372 | pj_pool_release(pool); |
| 373 | |
| 374 | return PJ_SUCCESS; |
| 375 | } |
| 376 | |
| 377 | |
| 378 | PJ_DEF(pj_status_t) pj_grp_lock_create( pj_pool_t *pool, |
| 379 | const pj_grp_lock_config *cfg, |
| 380 | pj_grp_lock_t **p_grp_lock) |
| 381 | { |
| 382 | pj_grp_lock_t *glock; |
| 383 | grp_lock_item *own_lock; |
| 384 | pj_status_t status; |
| 385 | |
| 386 | PJ_ASSERT_RETURN(pool && p_grp_lock, PJ_EINVAL); |
| 387 | |
| 388 | PJ_UNUSED_ARG(cfg); |
| 389 | |
| 390 | pool = pj_pool_create(pool->factory, "glck%p", 512, 512, NULL); |
| 391 | if (!pool) |
| 392 | return PJ_ENOMEM; |
| 393 | |
| 394 | glock = PJ_POOL_ZALLOC_T(pool, pj_grp_lock_t); |
| 395 | glock->base.lock_object = glock; |
| 396 | glock->base.acquire = &grp_lock_acquire; |
| 397 | glock->base.tryacquire = &grp_lock_tryacquire; |
| 398 | glock->base.release = &grp_lock_release; |
| 399 | glock->base.destroy = &grp_lock_destroy; |
| 400 | |
| 401 | glock->pool = pool; |
| 402 | pj_list_init(&glock->lock_list); |
| 403 | pj_list_init(&glock->destroy_list); |
| 404 | #if PJ_GRP_LOCK_DEBUG |
| 405 | pj_list_init(&glock->ref_list); |
| 406 | pj_list_init(&glock->ref_free_list); |
| 407 | #endif |
| 408 | |
| 409 | status = pj_atomic_create(pool, 0, &glock->ref_cnt); |
| 410 | if (status != PJ_SUCCESS) |
| 411 | goto on_error; |
| 412 | |
| 413 | status = pj_lock_create_recursive_mutex(pool, pool->obj_name, |
| 414 | &glock->own_lock); |
| 415 | if (status != PJ_SUCCESS) |
| 416 | goto on_error; |
| 417 | |
| 418 | own_lock = PJ_POOL_ZALLOC_T(pool, grp_lock_item); |
| 419 | own_lock->lock = glock->own_lock; |
| 420 | pj_list_push_back(&glock->lock_list, own_lock); |
| 421 | |
| 422 | *p_grp_lock = glock; |
| 423 | return PJ_SUCCESS; |
| 424 | |
| 425 | on_error: |
| 426 | grp_lock_destroy(glock); |
| 427 | return status; |
| 428 | } |
| 429 | |
| 430 | PJ_DEF(pj_status_t) pj_grp_lock_destroy( pj_grp_lock_t *grp_lock) |
| 431 | { |
| 432 | return grp_lock_destroy(grp_lock); |
| 433 | } |
| 434 | |
| 435 | PJ_DEF(pj_status_t) pj_grp_lock_acquire( pj_grp_lock_t *grp_lock) |
| 436 | { |
| 437 | return grp_lock_acquire(grp_lock); |
| 438 | } |
| 439 | |
| 440 | PJ_DEF(pj_status_t) pj_grp_lock_tryacquire( pj_grp_lock_t *grp_lock) |
| 441 | { |
| 442 | return grp_lock_tryacquire(grp_lock); |
| 443 | } |
| 444 | |
| 445 | PJ_DEF(pj_status_t) pj_grp_lock_release( pj_grp_lock_t *grp_lock) |
| 446 | { |
| 447 | return grp_lock_release(grp_lock); |
| 448 | } |
| 449 | |
| 450 | PJ_DEF(pj_status_t) pj_grp_lock_replace( pj_grp_lock_t *old_lock, |
| 451 | pj_grp_lock_t *new_lock) |
| 452 | { |
| 453 | grp_destroy_callback *ocb; |
| 454 | |
| 455 | /* Move handlers from old to new */ |
| 456 | ocb = old_lock->destroy_list.next; |
| 457 | while (ocb != &old_lock->destroy_list) { |
| 458 | grp_destroy_callback *ncb; |
| 459 | |
| 460 | ncb = PJ_POOL_ALLOC_T(new_lock->pool, grp_destroy_callback); |
| 461 | ncb->comp = ocb->comp; |
| 462 | ncb->handler = ocb->handler; |
| 463 | pj_list_push_back(&new_lock->destroy_list, ncb); |
| 464 | |
| 465 | ocb = ocb->next; |
| 466 | } |
| 467 | |
| 468 | pj_list_init(&old_lock->destroy_list); |
| 469 | |
| 470 | grp_lock_destroy(old_lock); |
| 471 | return PJ_SUCCESS; |
| 472 | } |
| 473 | |
| 474 | PJ_DEF(pj_status_t) pj_grp_lock_add_handler( pj_grp_lock_t *glock, |
| 475 | pj_pool_t *pool, |
| 476 | void *comp, |
| 477 | void (*destroy)(void *comp)) |
| 478 | { |
| 479 | grp_destroy_callback *cb; |
| 480 | |
| 481 | grp_lock_acquire(glock); |
| 482 | |
| 483 | if (pool == NULL) |
| 484 | pool = glock->pool; |
| 485 | |
| 486 | cb = PJ_POOL_ZALLOC_T(pool, grp_destroy_callback); |
| 487 | cb->comp = comp; |
| 488 | cb->handler = destroy; |
| 489 | pj_list_push_back(&glock->destroy_list, cb); |
| 490 | |
| 491 | grp_lock_release(glock); |
| 492 | return PJ_SUCCESS; |
| 493 | } |
| 494 | |
| 495 | PJ_DEF(pj_status_t) pj_grp_lock_del_handler( pj_grp_lock_t *glock, |
| 496 | void *comp, |
| 497 | void (*destroy)(void *comp)) |
| 498 | { |
| 499 | grp_destroy_callback *cb; |
| 500 | |
| 501 | grp_lock_acquire(glock); |
| 502 | |
| 503 | cb = glock->destroy_list.next; |
| 504 | while (cb != &glock->destroy_list) { |
| 505 | if (cb->comp == comp && cb->handler == destroy) |
| 506 | break; |
| 507 | cb = cb->next; |
| 508 | } |
| 509 | |
| 510 | if (cb != &glock->destroy_list) |
| 511 | pj_list_erase(cb); |
| 512 | |
| 513 | grp_lock_release(glock); |
| 514 | return PJ_SUCCESS; |
| 515 | } |
| 516 | |
| 517 | static pj_status_t grp_lock_add_ref(pj_grp_lock_t *glock) |
| 518 | { |
| 519 | pj_atomic_inc(glock->ref_cnt); |
| 520 | return PJ_SUCCESS; |
| 521 | } |
| 522 | |
| 523 | static pj_status_t grp_lock_dec_ref(pj_grp_lock_t *glock) |
| 524 | { |
| 525 | int cnt; /* for debugging */ |
| 526 | if ((cnt=pj_atomic_dec_and_get(glock->ref_cnt)) == 0) { |
| 527 | grp_lock_destroy(glock); |
| 528 | return PJ_EGONE; |
| 529 | } |
| 530 | pj_assert(cnt > 0); |
| 531 | pj_grp_lock_dump(glock); |
| 532 | return PJ_SUCCESS; |
| 533 | } |
| 534 | |
| 535 | #if PJ_GRP_LOCK_DEBUG |
| 536 | PJ_DEF(pj_status_t) pj_grp_lock_add_ref_dbg(pj_grp_lock_t *glock, |
| 537 | const char *file, |
| 538 | int line) |
| 539 | { |
| 540 | grp_lock_ref *ref; |
| 541 | pj_status_t status; |
| 542 | |
| 543 | pj_enter_critical_section(); |
| 544 | if (!pj_list_empty(&glock->ref_free_list)) { |
| 545 | ref = glock->ref_free_list.next; |
| 546 | pj_list_erase(ref); |
| 547 | } else { |
| 548 | ref = PJ_POOL_ALLOC_T(glock->pool, grp_lock_ref); |
| 549 | } |
| 550 | |
| 551 | ref->file = file; |
| 552 | ref->line = line; |
| 553 | pj_list_push_back(&glock->ref_list, ref); |
| 554 | |
| 555 | pj_leave_critical_section(); |
| 556 | |
| 557 | status = grp_lock_add_ref(glock); |
| 558 | |
| 559 | if (status != PJ_SUCCESS) { |
| 560 | pj_enter_critical_section(); |
| 561 | pj_list_erase(ref); |
| 562 | pj_list_push_back(&glock->ref_free_list, ref); |
| 563 | pj_leave_critical_section(); |
| 564 | } |
| 565 | |
| 566 | return status; |
| 567 | } |
| 568 | |
| 569 | PJ_DEF(pj_status_t) pj_grp_lock_dec_ref_dbg(pj_grp_lock_t *glock, |
| 570 | const char *file, |
| 571 | int line) |
| 572 | { |
| 573 | grp_lock_ref *ref; |
| 574 | |
| 575 | pj_enter_critical_section(); |
| 576 | /* Find the same source file */ |
| 577 | ref = glock->ref_list.next; |
| 578 | while (ref != &glock->ref_list) { |
| 579 | if (strcmp(ref->file, file) == 0) { |
| 580 | pj_list_erase(ref); |
| 581 | pj_list_push_back(&glock->ref_free_list, ref); |
| 582 | break; |
| 583 | } |
| 584 | ref = ref->next; |
| 585 | } |
| 586 | pj_leave_critical_section(); |
| 587 | |
| 588 | if (ref == &glock->ref_list) { |
| 589 | PJ_LOG(2,(THIS_FILE, "pj_grp_lock_dec_ref_dbg() could not find " |
| 590 | "matching ref for %s", file)); |
| 591 | } |
| 592 | |
| 593 | return grp_lock_dec_ref(glock); |
| 594 | } |
| 595 | #else |
| 596 | PJ_DEF(pj_status_t) pj_grp_lock_add_ref(pj_grp_lock_t *glock) |
| 597 | { |
| 598 | return grp_lock_add_ref(glock); |
| 599 | } |
| 600 | |
| 601 | PJ_DEF(pj_status_t) pj_grp_lock_dec_ref(pj_grp_lock_t *glock) |
| 602 | { |
| 603 | return grp_lock_dec_ref(glock); |
| 604 | } |
| 605 | #endif |
| 606 | |
| 607 | PJ_DEF(int) pj_grp_lock_get_ref(pj_grp_lock_t *glock) |
| 608 | { |
| 609 | return pj_atomic_get(glock->ref_cnt); |
| 610 | } |
| 611 | |
| 612 | PJ_DEF(pj_status_t) pj_grp_lock_chain_lock( pj_grp_lock_t *glock, |
| 613 | pj_lock_t *lock, |
| 614 | int pos) |
| 615 | { |
| 616 | grp_lock_item *lck, *new_lck; |
| 617 | int i; |
| 618 | |
| 619 | grp_lock_acquire(glock); |
| 620 | |
| 621 | for (i=0; i<glock->owner_cnt; ++i) |
| 622 | pj_lock_acquire(lock); |
| 623 | |
| 624 | lck = glock->lock_list.next; |
| 625 | while (lck != &glock->lock_list) { |
| 626 | if (lck->prio >= pos) |
| 627 | break; |
| 628 | lck = lck->next; |
| 629 | } |
| 630 | |
| 631 | new_lck = PJ_POOL_ZALLOC_T(glock->pool, grp_lock_item); |
| 632 | new_lck->prio = pos; |
| 633 | new_lck->lock = lock; |
| 634 | pj_list_insert_before(lck, new_lck); |
| 635 | |
| 636 | /* this will also release the new lock */ |
| 637 | grp_lock_release(glock); |
| 638 | return PJ_SUCCESS; |
| 639 | } |
| 640 | |
| 641 | PJ_DEF(pj_status_t) pj_grp_lock_unchain_lock( pj_grp_lock_t *glock, |
| 642 | pj_lock_t *lock) |
| 643 | { |
| 644 | grp_lock_item *lck; |
| 645 | |
| 646 | grp_lock_acquire(glock); |
| 647 | |
| 648 | lck = glock->lock_list.next; |
| 649 | while (lck != &glock->lock_list) { |
| 650 | if (lck->lock == lock) |
| 651 | break; |
| 652 | lck = lck->next; |
| 653 | } |
| 654 | |
| 655 | if (lck != &glock->lock_list) { |
| 656 | int i; |
| 657 | |
| 658 | pj_list_erase(lck); |
| 659 | for (i=0; i<glock->owner_cnt; ++i) |
| 660 | pj_lock_release(lck->lock); |
| 661 | } |
| 662 | |
| 663 | grp_lock_release(glock); |
| 664 | return PJ_SUCCESS; |
| 665 | } |
| 666 | |
| 667 | PJ_DEF(void) pj_grp_lock_dump(pj_grp_lock_t *grp_lock) |
| 668 | { |
| 669 | #if PJ_GRP_LOCK_DEBUG |
| 670 | grp_lock_ref *ref = grp_lock->ref_list.next; |
| 671 | char info_buf[1000]; |
| 672 | pj_str_t info; |
| 673 | |
| 674 | info.ptr = info_buf; |
| 675 | info.slen = 0; |
| 676 | |
| 677 | pj_grp_lock_acquire(grp_lock); |
| 678 | pj_enter_critical_section(); |
| 679 | |
| 680 | while (ref != &grp_lock->ref_list && info.slen < sizeof(info_buf)) { |
| 681 | char *start = info.ptr + info.slen; |
| 682 | int max_len = sizeof(info_buf) - info.slen; |
| 683 | int len; |
| 684 | |
| 685 | len = pj_ansi_snprintf(start, max_len, "%s:%d ", ref->file, ref->line); |
| 686 | if (len < 1 || len >= max_len) { |
| 687 | len = strlen(ref->file); |
| 688 | if (len > max_len - 1) |
| 689 | len = max_len - 1; |
| 690 | |
| 691 | memcpy(start, ref->file, len); |
| 692 | start[len++] = ' '; |
| 693 | } |
| 694 | |
| 695 | info.slen += len; |
| 696 | |
| 697 | ref = ref->next; |
| 698 | } |
| 699 | |
| 700 | if (ref != &grp_lock->ref_list) { |
| 701 | int i; |
| 702 | for (i=0; i<4; ++i) |
| 703 | info_buf[sizeof(info_buf)-i-1] = '.'; |
| 704 | } |
| 705 | info.ptr[info.slen-1] = '\0'; |
| 706 | |
| 707 | pj_leave_critical_section(); |
| 708 | pj_grp_lock_release(grp_lock); |
| 709 | |
| 710 | PJ_LOG(4,(THIS_FILE, "Group lock %p, ref_cnt=%d. Reference holders: %s", |
| 711 | grp_lock, pj_grp_lock_get_ref(grp_lock), info.ptr)); |
| 712 | #else |
| 713 | PJ_UNUSED_ARG(grp_lock); |
| 714 | #endif |
| 715 | } |