src/introspection.c

   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
  30 typedef 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;
  36 typedef struct dispatch_introspection_thread_s *dispatch_introspection_thread_t;
  37
  38 static TAILQ_HEAD(, dispatch_introspection_thread_s)
  39                 _dispatch_introspection_threads =
  40                 TAILQ_HEAD_INITIALIZER(_dispatch_introspection_threads);
  41 static volatile OSSpinLock _dispatch_introspection_threads_lock;
  42
  43 static void _dispatch_introspection_thread_remove(void *ctxt);
  44
  45 static TAILQ_HEAD(, dispatch_queue_s) _dispatch_introspection_queues =
  46                 TAILQ_HEAD_INITIALIZER(_dispatch_introspection_queues);
  47 static volatile OSSpinLock _dispatch_introspection_queues_lock;
  48
  49 static ptrdiff_t _dispatch_introspection_thread_queue_offset;
  50
  51 #pragma mark -
  52 #pragma mark dispatch_introspection_init
  53
  54 void
  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
  85 const struct dispatch_introspection_versions_s
  86 dispatch_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
 109 void
 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
 127 static 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
 141 static inline
 142 dispatch_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
 208 static inline
 209 dispatch_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
 221 DISPATCH_USED inline
 222 dispatch_introspection_queue_s
 223 dispatch_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
 246 static inline
 247 dispatch_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
 280 static inline
 281 dispatch_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
 294 DISPATCH_USED inline
 295 dispatch_introspection_queue_item_s
 296 dispatch_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
 325 DISPATCH_USED
 326 dispatch_queue_t
 327 dispatch_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
 343 DISPATCH_USED
 344 dispatch_continuation_t
 345 dispatch_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
 361 DISPATCH_USED
 362 dispatch_continuation_t
 363 dispatch_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
 385 dispatch_introspection_hooks_s _dispatch_introspection_hooks;
 386 dispatch_introspection_hooks_s _dispatch_introspection_hook_callouts;
 387 static const
 388 dispatch_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
 419 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_create);
 420 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_destroy);
 421 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_item_enqueue);
 422 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_item_dequeue);
 423 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_item_complete);
 424 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_callout_begin);
 425 DISPATCH_INTROSPECTION_INTERPOSABLE_HOOK(queue_callout_end);
 426
 427 DISPATCH_USED
 428 void
 429 dispatch_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
 446 DISPATCH_USED
 447 void
 448 dispatch_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
 464 DISPATCH_NOINLINE
 465 void
 466 dispatch_introspection_hook_callout_queue_create(
 467                 dispatch_introspection_queue_t queue_info)
 468 {
 469         DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_create, queue_info);
 470 }
 471
 472 DISPATCH_NOINLINE
 473 static 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
 481 dispatch_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
 495 DISPATCH_NOINLINE
 496 void
 497 dispatch_introspection_hook_callout_queue_dispose(
 498                 dispatch_introspection_queue_t queue_info)
 499 {
 500         DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_dispose, queue_info);
 501 }
 502
 503 DISPATCH_NOINLINE
 504 static 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
 512 void
 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
 525 DISPATCH_NOINLINE
 526 void
 527 dispatch_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
 533 DISPATCH_NOINLINE
 534 static 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
 543 void
 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
 554 DISPATCH_NOINLINE
 555 void
 556 dispatch_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
 562 DISPATCH_NOINLINE
 563 static 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
 572 void
 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
 583 DISPATCH_NOINLINE
 584 void
 585 dispatch_introspection_hook_callout_queue_item_complete(
 586                 dispatch_continuation_t object)
 587 {
 588         DISPATCH_INTROSPECTION_HOOK_CALLOUT(queue_item_complete, object);
 589 }
 590
 591 DISPATCH_NOINLINE
 592 static 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
 598 void
 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
 607 void
 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
 614 void
 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