1/* 2 * Copyright (c) 2012-2013 Apple Inc. All rights reserved. 3 * 4 * @APPLE_APACHE_LICENSE_HEADER_START@ 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 * 18 * @APPLE_APACHE_LICENSE_HEADER_END@ 19 */ 20 21// Contains introspection routines that only exist in the version of the 22// library with introspection support 23 24#if DISPATCH_INTROSPECTION 25 26#include "internal.h" 27#include "introspection.h" 28#include "introspection_private.h" 29 30typedef struct dispatch_introspection_thread_s { 31 void *dit_isa; 32 TAILQ_ENTRY(dispatch_introspection_thread_s) dit_list; 33 pthread_t thread; 34 dispatch_queue_t *queue; 35} dispatch_introspection_thread_s; 36typedef struct dispatch_introspection_thread_s *dispatch_introspection_thread_t; 37 38static TAILQ_HEAD(, dispatch_introspection_thread_s) 39 _dispatch_introspection_threads = 40 TAILQ_HEAD_INITIALIZER(_dispatch_introspection_threads); 41static volatile OSSpinLock _dispatch_introspection_threads_lock; 42 43static void _dispatch_introspection_thread_remove(void *ctxt); 44 45static TAILQ_HEAD(, dispatch_queue_s) _dispatch_introspection_queues = 46 TAILQ_HEAD_INITIALIZER(_dispatch_introspection_queues); 47static volatile OSSpinLock _dispatch_introspection_queues_lock; 48 49static ptrdiff_t _dispatch_introspection_thread_queue_offset; 50 51#pragma mark - 52#pragma mark dispatch_introspection_init 53 54void 55_dispatch_introspection_init(void) 56{ 57 TAILQ_INSERT_TAIL(&_dispatch_introspection_queues, 58 &_dispatch_main_q, diq_list); 59 TAILQ_INSERT_TAIL(&_dispatch_introspection_queues, 60 &_dispatch_mgr_q, diq_list); 61#if DISPATCH_ENABLE_PTHREAD_ROOT_QUEUES 62 TAILQ_INSERT_TAIL(&_dispatch_introspection_queues, 63 _dispatch_mgr_q.do_targetq, diq_list); 64#endif 65 for (size_t i = 0; i < DISPATCH_ROOT_QUEUE_COUNT; i++) { 66 TAILQ_INSERT_TAIL(&_dispatch_introspection_queues, 67 &_dispatch_root_queues[i], diq_list); 68 } 69 70 // Hack to determine queue TSD offset from start of pthread structure 71 uintptr_t thread = _dispatch_thread_self(); 72 thread_identifier_info_data_t tiid; 73 mach_msg_type_number_t cnt = THREAD_IDENTIFIER_INFO_COUNT; 74 kern_return_t kr = thread_info(pthread_mach_thread_np((void*)thread), 75 THREAD_IDENTIFIER_INFO, (thread_info_t)&tiid, &cnt); 76 if (!dispatch_assume_zero(kr)) { 77 _dispatch_introspection_thread_queue_offset = 78 (void*)(uintptr_t)tiid.dispatch_qaddr - (void*)thread; 79 } 80 _dispatch_thread_key_create(&dispatch_introspection_key, 81 _dispatch_introspection_thread_remove); 82 _dispatch_introspection_thread_add(); // add main thread 83} 84 85const struct dispatch_introspection_versions_s 86dispatch_introspection_versions = { 87 .introspection_version = 1, 88 .hooks_version = 2, 89 .hooks_size = sizeof(dispatch_introspection_hooks_s), 90 .queue_item_version = 1, 91 .queue_item_size = sizeof(dispatch_introspection_queue_item_s), 92 .queue_block_version = 1, 93 .queue_block_size = sizeof(dispatch_introspection_queue_block_s), 94 .queue_function_version = 1, 95 .queue_function_size = sizeof(dispatch_introspection_queue_function_s), 96 .queue_thread_version = 1, 97 .queue_thread_size = sizeof(dispatch_introspection_queue_thread_s), 98 .object_version = 1, 99 .object_size = sizeof(dispatch_introspection_object_s), 100 .queue_version = 1, 101 .queue_size = sizeof(dispatch_introspection_queue_s), 102 .source_version = 1, 103 .source_size = sizeof(dispatch_introspection_source_s), 104}; 105 106#pragma mark - 107#pragma mark dispatch_introspection_threads 108 109void 110_dispatch_introspection_thread_add(void) 111{ 112 if (_dispatch_thread_getspecific(dispatch_introspection_key)) { 113 return; 114 } 115 uintptr_t thread = _dispatch_thread_self(); 116 dispatch_introspection_thread_t dit = (void*)_dispatch_continuation_alloc(); 117 dit->dit_isa = (void*)0x41; 118 dit->thread = (void*)thread; 119 dit->queue = !_dispatch_introspection_thread_queue_offset ? NULL : 120 (void*)thread + _dispatch_introspection_thread_queue_offset; 121 _dispatch_thread_setspecific(dispatch_introspection_key, dit); 122 OSSpinLockLock(&_dispatch_introspection_threads_lock); 123 TAILQ_INSERT_TAIL(&_dispatch_introspection_threads, dit, dit_list); 124 OSSpinLockUnlock(&_dispatch_introspection_threads_lock); 125} 126 127static void 128_dispatch_introspection_thread_remove(void *ctxt) 129{ 130 dispatch_introspection_thread_t dit = ctxt; 131 OSSpinLockLock(&_dispatch_introspection_threads_lock); 132 TAILQ_REMOVE(&_dispatch_introspection_threads, dit, dit_list); 133 OSSpinLockUnlock(&_dispatch_introspection_threads_lock); 134 _dispatch_continuation_free((void*)dit); 135 _dispatch_thread_setspecific(dispatch_introspection_key, NULL); 136} 137 138#pragma mark - 139#pragma mark dispatch_introspection_info 140 141static inline 142dispatch_introspection_queue_function_s 143_dispatch_introspection_continuation_get_info(dispatch_queue_t dq, 144 dispatch_continuation_t dc, unsigned long *type) 145{ 146 void *ctxt = dc->dc_ctxt; 147 dispatch_function_t func = dc->dc_func; 148 pthread_t waiter = NULL; 149 bool apply = false; 150 long flags = (long)dc->do_vtable; 151 if (flags & DISPATCH_OBJ_SYNC_SLOW_BIT) { 152 waiter = dc->dc_data; 153 if (flags & DISPATCH_OBJ_BARRIER_BIT) { 154 dc = dc->dc_ctxt; 155 dq = dc->dc_data; 156 } 157 ctxt = dc->dc_ctxt; 158 func = dc->dc_func; 159 } 160 if (func == _dispatch_sync_recurse_invoke) { 161 dc = dc->dc_ctxt; 162 dq = dc->dc_data; 163 ctxt = dc->dc_ctxt; 164 func = dc->dc_func; 165 } else if (func == _dispatch_async_redirect_invoke) { 166 dq = dc->dc_data; 167 dc = dc->dc_other; 168 ctxt = dc->dc_ctxt; 169 func = dc->dc_func; 170 flags = (long)dc->do_vtable; 171 } else if (func == _dispatch_mach_barrier_invoke) { 172 dq = dq->do_targetq; 173 ctxt = dc->dc_data; 174 func = dc->dc_other; 175 } else if (func == _dispatch_apply_invoke || 176 func == _dispatch_apply_redirect_invoke) { 177 dispatch_apply_t da = ctxt; 178 if (da->da_todo) { 179 dc = da->da_dc; 180 if (func == _dispatch_apply_redirect_invoke) { 181 dq = dc->dc_data; 182 } 183 ctxt = dc->dc_ctxt; 184 func = dc->dc_func; 185 apply = true; 186 } 187 } 188 if (func == _dispatch_call_block_and_release) { 189 *type = dispatch_introspection_queue_item_type_block; 190 func = _dispatch_Block_invoke(ctxt); 191 } else { 192 *type = dispatch_introspection_queue_item_type_function; 193 } 194 dispatch_introspection_queue_function_s diqf= { 195 .continuation = dc, 196 .target_queue = dq, 197 .context = ctxt, 198 .function = func, 199 .group = flags & DISPATCH_OBJ_GROUP_BIT ? dc->dc_data : NULL, 200 .waiter = waiter, 201 .barrier = flags & DISPATCH_OBJ_BARRIER_BIT, 202 .sync = flags & DISPATCH_OBJ_SYNC_SLOW_BIT, 203 .apply = apply, 204 }; 205 return diqf; 206} 207 208static inline 209dispatch_introspection_object_s 210_dispatch_introspection_object_get_info(dispatch_object_t dou) 211{ 212 dispatch_introspection_object_s dio = { 213 .object = dou._dc, 214 .target_queue = dou._do->do_targetq, 215 .type = (void*)dou._do->do_vtable, 216 .kind = dx_kind(dou._do), 217 }; 218 return dio; 219} 220 221DISPATCH_USED inline 222dispatch_introspection_queue_s 223dispatch_introspection_queue_get_info(dispatch_queue_t dq) 224{ 225 bool global = (dq->do_xref_cnt == DISPATCH_OBJECT_GLOBAL_REFCNT) || 226 (dq->do_ref_cnt == DISPATCH_OBJECT_GLOBAL_REFCNT); 227 uint32_t width = dq->dq_width; 228 if (width > 1 && width != UINT32_MAX) width /= 2; 229 dispatch_introspection_queue_s diq = { 230 .queue = dq, 231 .target_queue = dq->do_targetq, 232 .label = dq->dq_label, 233 .serialnum = dq->dq_serialnum, 234 .width = width, 235 .suspend_count = dq->do_suspend_cnt / 2, 236 .enqueued = (dq->do_suspend_cnt & 1) && !global, 237 .barrier = (dq->dq_running & 1) && !global, 238 .draining = (dq->dq_items_head == (void*)~0ul) || 239 (!dq->dq_items_head && dq->dq_items_tail), 240 .global = global, 241 .main = (dq == &_dispatch_main_q), 242 }; 243 return diq; 244} 245 246static inline 247dispatch_introspection_source_s 248_dispatch_introspection_source_get_info(dispatch_source_t ds) 249{ 250 dispatch_source_refs_t dr = ds->ds_refs; 251 void *ctxt = dr->ds_handler_ctxt; 252 dispatch_function_t handler = dr->ds_handler_func; 253 bool handler_is_block = ds->ds_handler_is_block; 254 bool after = (handler == _dispatch_after_timer_callback); 255 if (after && !(ds->ds_atomic_flags & DSF_CANCELED)) { 256 dispatch_continuation_t dc = ctxt; 257 ctxt = dc->dc_ctxt; 258 handler = dc->dc_func; 259 if (handler == _dispatch_call_block_and_release) { 260 handler = _dispatch_Block_invoke(ctxt); 261 handler_is_block = 1; 262 } 263 } 264 dispatch_introspection_source_s dis = { 265 .source = ds, 266 .target_queue = ds->do_targetq, 267 .type = ds->ds_dkev ? (unsigned long)ds->ds_dkev->dk_kevent.filter : 0, 268 .handle = ds->ds_dkev ? (unsigned long)ds->ds_dkev->dk_kevent.ident : 0, 269 .context = ctxt, 270 .handler = handler, 271 .suspend_count = ds->do_suspend_cnt / 2, 272 .enqueued = (ds->do_suspend_cnt & 1), 273 .handler_is_block = handler_is_block, 274 .timer = ds->ds_is_timer, 275 .after = after, 276 }; 277 return dis; 278} 279 280static inline 281dispatch_introspection_queue_thread_s 282_dispatch_introspection_thread_get_info(dispatch_introspection_thread_t dit) 283{ 284 dispatch_introspection_queue_thread_s diqt = { 285 .object = (void*)dit, 286 .thread = dit->thread, 287 }; 288 if (dit->queue && *dit->queue) { 289 diqt.queue = dispatch_introspection_queue_get_info(*dit->queue); 290 } 291 return diqt; 292} 293 294DISPATCH_USED inline 295dispatch_introspection_queue_item_s 296dispatch_introspection_queue_item_get_info(dispatch_queue_t dq, 297 dispatch_continuation_t dc) 298{ 299 dispatch_introspection_queue_item_s diqi; 300 if (DISPATCH_OBJ_IS_VTABLE(dc)) { 301 dispatch_object_t dou = (dispatch_object_t)dc; 302 unsigned long type = dx_type(dou._do); 303 unsigned long metatype = type & _DISPATCH_META_TYPE_MASK; 304 if (metatype == _DISPATCH_QUEUE_TYPE && 305 type != DISPATCH_QUEUE_SPECIFIC_TYPE) { 306 diqi.type = dispatch_introspection_queue_item_type_queue; 307 diqi.queue = dispatch_introspection_queue_get_info(dou._dq); 308 } else if (metatype == _DISPATCH_SOURCE_TYPE) { 309 diqi.type = dispatch_introspection_queue_item_type_source; 310 diqi.source = _dispatch_introspection_source_get_info(dou._ds); 311 } else { 312 diqi.type = dispatch_introspection_queue_item_type_object; 313 diqi.object = _dispatch_introspection_object_get_info(dou._do); 314 } 315 } else { 316 diqi.function = _dispatch_introspection_continuation_get_info(dq, dc, 317 &diqi.type); 318 } 319 return diqi; 320} 321 322#pragma mark - 323#pragma mark dispatch_introspection_iterators 324 325DISPATCH_USED 326dispatch_queue_t 327dispatch_introspection_get_queues(dispatch_queue_t start, size_t count, 328 dispatch_introspection_queue_t queues) 329{ 330 dispatch_queue_t next; 331 next = start ? start : TAILQ_FIRST(&_dispatch_introspection_queues); 332 while (count--) { 333 if (!next) { 334 queues->queue = NULL; 335 break; 336 } 337 *queues++ = dispatch_introspection_queue_get_info(next); 338 next = TAILQ_NEXT(next, diq_list); 339 } 340 return next; 341} 342 343DISPATCH_USED 344dispatch_continuation_t 345dispatch_introspection_get_queue_threads(dispatch_continuation_t start, 346 size_t count, dispatch_introspection_queue_thread_t threads) 347{ 348 dispatch_introspection_thread_t next = start ? (void*)start : 349 TAILQ_FIRST(&_dispatch_introspection_threads); 350 while (count--) { 351 if (!next) { 352 threads->object = NULL; 353 break; 354 } 355 *threads++ = _dispatch_introspection_thread_get_info(next); 356 next = TAILQ_NEXT(next, dit_list); 357 } 358 return (void*)next; 359} 360 361DISPATCH_USED 362dispatch_continuation_t 363dispatch_introspection_queue_get_items(dispatch_queue_t dq, 364 dispatch_continuation_t start, size_t count, 365 dispatch_introspection_queue_item_t items) 366{ 367 dispatch_continuation_t next = start ? start : 368 dq->dq_items_head == (void*)~0ul ? NULL : (void*)dq->dq_items_head; 369 while (count--) { 370 if (!next) { 371 items->type = dispatch_introspection_queue_item_type_none; 372 break; 373 } 374 *items++ = dispatch_introspection_queue_item_get_info(dq, next); 375 next = next->do_next; 376 } 377 return next; 378} 379 380#pragma mark - 381#pragma mark dispatch_introspection_hooks 382 383#define DISPATCH_INTROSPECTION_NO_HOOK ((void*)~0ul) 384 385dispatch_introspection_hooks_s _dispatch_introspection_hooks; 386dispatch_introspection_hooks_s _dispatch_introspection_hook_callouts; 387static const 388dispatch_introspection_hooks_s _dispatch_introspection_hook_callouts_enabled = { 389 .queue_create = DISPATCH_INTROSPECTION_NO_HOOK, 390 .queue_dispose = DISPATCH_INTROSPECTION_NO_HOOK, 391 .queue_item_enqueue = DISPATCH_INTROSPECTION_NO_HOOK, 392 .queue_item_dequeue = DISPATCH_INTROSPECTION_NO_HOOK, 393 .queue_item_complete = DISPATCH_INTROSPECTION_NO_HOOK, 394}; 395 396#define DISPATCH_INTROSPECTION_HOOKS_COUNT (( \ 397 sizeof(_dispatch_introspection_hook_callouts_enabled) - \ 398 sizeof(_dispatch_introspection_hook_callouts_enabled._reserved)) / \ 399 sizeof(dispatch_function_t)) 400 401#define DISPATCH_INTROSPECTION_HOOK_ENABLED(h) \ 402 (slowpath(_dispatch_introspection_hooks.h)) 403 404#define DISPATCH_INTROSPECTION_HOOK_CALLOUT(h, ...) ({ \ 405 typeof(_dispatch_introspection_hooks.h) _h; \ 406 _h = _dispatch_introspection_hooks.h; \ 407 if (slowpath((void*)(_h) != DISPATCH_INTROSPECTION_NO_HOOK)) { \ 408 _h(__VA_ARGS__); \ 409 } }) 410 411#define DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(h) \ 412 DISPATCH_EXPORT void _dispatch_introspection_hook_##h(void) \ 413 asm("_dispatch_introspection_hook_" #h); \ 414 void _dispatch_introspection_hook_##h(void) {} 415 416#define DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT(h, ...)\ 417 dispatch_introspection_hook_##h(__VA_ARGS__) 418 419DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_create); 420DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_destroy); 421DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_item_enqueue); 422DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_item_dequeue); 423DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_item_complete); 424DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_callout_begin); 425DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_callout_end); 426 427DISPATCH_USED 428void 429dispatch_introspection_hooks_install(dispatch_introspection_hooks_t hooks) 430{ 431 dispatch_introspection_hooks_s old_hooks = _dispatch_introspection_hooks; 432 _dispatch_introspection_hooks = *hooks; 433 dispatch_function_t *e = (void*)&_dispatch_introspection_hook_callouts, 434 *h = (void*)&_dispatch_introspection_hooks, *oh = (void*)&old_hooks; 435 for (size_t i = 0; i < DISPATCH_INTROSPECTION_HOOKS_COUNT; i++) { 436 if (!h[i] && e[i]) { 437 h[i] = DISPATCH_INTROSPECTION_NO_HOOK; 438 } 439 if (oh[i] == DISPATCH_INTROSPECTION_NO_HOOK) { 440 oh[i] = NULL; 441 } 442 } 443 *hooks = old_hooks; 444} 445 446DISPATCH_USED 447void 448dispatch_introspection_hook_callouts_enable( 449 dispatch_introspection_hooks_t enable) 450{ 451 _dispatch_introspection_hook_callouts = enable ? *enable : 452 _dispatch_introspection_hook_callouts_enabled; 453 dispatch_function_t *e = (void*)&_dispatch_introspection_hook_callouts, 454 *h = (void*)&_dispatch_introspection_hooks; 455 for (size_t i = 0; i < DISPATCH_INTROSPECTION_HOOKS_COUNT; i++) { 456 if (e[i] && !h[i]) { 457 h[i] = DISPATCH_INTROSPECTION_NO_HOOK; 458 } else if (!e[i] && h[i] == DISPATCH_INTROSPECTION_NO_HOOK) { 459 h[i] = NULL; 460 } 461 } 462} 463 464DISPATCH_NOINLINE 465void 466dispatch_introspection_hook_callout_queue_create( 467 dispatch_introspection_queue_t queue_info) 468{ 469 DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_create, queue_info); 470} 471 472DISPATCH_NOINLINE 473static void 474_dispatch_introspection_queue_create_hook(dispatch_queue_t dq) 475{ 476 dispatch_introspection_queue_s diq; 477 diq = dispatch_introspection_queue_get_info(dq); 478 dispatch_introspection_hook_callout_queue_create(&diq); 479} 480 481dispatch_queue_t 482_dispatch_introspection_queue_create(dispatch_queue_t dq) 483{ 484 OSSpinLockLock(&_dispatch_introspection_queues_lock); 485 TAILQ_INSERT_TAIL(&_dispatch_introspection_queues, dq, diq_list); 486 OSSpinLockUnlock(&_dispatch_introspection_queues_lock); 487 488 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT(queue_create, dq); 489 if (DISPATCH_INTROSPECTION_HOOK_ENABLED(queue_create)) { 490 _dispatch_introspection_queue_create_hook(dq); 491 } 492 return dq; 493} 494 495DISPATCH_NOINLINE 496void 497dispatch_introspection_hook_callout_queue_dispose( 498 dispatch_introspection_queue_t queue_info) 499{ 500 DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_dispose, queue_info); 501} 502 503DISPATCH_NOINLINE 504static void 505_dispatch_introspection_queue_dispose_hook(dispatch_queue_t dq) 506{ 507 dispatch_introspection_queue_s diq; 508 diq = dispatch_introspection_queue_get_info(dq); 509 dispatch_introspection_hook_callout_queue_dispose(&diq); 510} 511 512void 513_dispatch_introspection_queue_dispose(dispatch_queue_t dq) 514{ 515 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT(queue_destroy, dq); 516 if (DISPATCH_INTROSPECTION_HOOK_ENABLED(queue_dispose)) { 517 _dispatch_introspection_queue_dispose_hook(dq); 518 } 519 520 OSSpinLockLock(&_dispatch_introspection_queues_lock); 521 TAILQ_REMOVE(&_dispatch_introspection_queues, dq, diq_list); 522 OSSpinLockUnlock(&_dispatch_introspection_queues_lock); 523} 524 525DISPATCH_NOINLINE 526void 527dispatch_introspection_hook_callout_queue_item_enqueue(dispatch_queue_t queue, 528 dispatch_introspection_queue_item_t item) 529{ 530 DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_item_enqueue, queue, item); 531} 532 533DISPATCH_NOINLINE 534static void 535_dispatch_introspection_queue_item_enqueue_hook(dispatch_queue_t dq, 536 dispatch_object_t dou) 537{ 538 dispatch_introspection_queue_item_s diqi; 539 diqi = dispatch_introspection_queue_item_get_info(dq, dou._dc); 540 dispatch_introspection_hook_callout_queue_item_enqueue(dq, &diqi); 541} 542 543void 544_dispatch_introspection_queue_item_enqueue(dispatch_queue_t dq, 545 dispatch_object_t dou) 546{ 547 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT( 548 queue_item_enqueue, dq, dou); 549 if (DISPATCH_INTROSPECTION_HOOK_ENABLED(queue_item_enqueue)) { 550 _dispatch_introspection_queue_item_enqueue_hook(dq, dou); 551 } 552} 553 554DISPATCH_NOINLINE 555void 556dispatch_introspection_hook_callout_queue_item_dequeue(dispatch_queue_t queue, 557 dispatch_introspection_queue_item_t item) 558{ 559 DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_item_dequeue, queue, item); 560} 561 562DISPATCH_NOINLINE 563static void 564_dispatch_introspection_queue_item_dequeue_hook(dispatch_queue_t dq, 565 dispatch_object_t dou) 566{ 567 dispatch_introspection_queue_item_s diqi; 568 diqi = dispatch_introspection_queue_item_get_info(dq, dou._dc); 569 dispatch_introspection_hook_callout_queue_item_dequeue(dq, &diqi); 570} 571 572void 573_dispatch_introspection_queue_item_dequeue(dispatch_queue_t dq, 574 dispatch_object_t dou) 575{ 576 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT( 577 queue_item_dequeue, dq, dou); 578 if (DISPATCH_INTROSPECTION_HOOK_ENABLED(queue_item_dequeue)) { 579 _dispatch_introspection_queue_item_dequeue_hook(dq, dou); 580 } 581} 582 583DISPATCH_NOINLINE 584void 585dispatch_introspection_hook_callout_queue_item_complete( 586 dispatch_continuation_t object) 587{ 588 DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_item_complete, object); 589} 590 591DISPATCH_NOINLINE 592static void 593_dispatch_introspection_queue_item_complete_hook(dispatch_object_t dou) 594{ 595 dispatch_introspection_hook_callout_queue_item_complete(dou._dc); 596} 597 598void 599_dispatch_introspection_queue_item_complete(dispatch_object_t dou) 600{ 601 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT(queue_item_complete, dou); 602 if (DISPATCH_INTROSPECTION_HOOK_ENABLED(queue_item_complete)) { 603 _dispatch_introspection_queue_item_complete_hook(dou); 604 } 605} 606 607void 608_dispatch_introspection_callout_entry(void *ctxt, dispatch_function_t f) { 609 dispatch_queue_t dq = _dispatch_queue_get_current(); 610 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT( 611 queue_callout_begin, dq, ctxt, f); 612} 613 614void 615_dispatch_introspection_callout_return(void *ctxt, dispatch_function_t f) { 616 dispatch_queue_t dq = _dispatch_queue_get_current(); 617 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK_CALLOUT( 618 queue_callout_end, dq, ctxt, f); 619} 620 621#endif // DISPATCH_INTROSPECTION 622