mono/metadata/threadpool.c

   1 /*
   2  * threadpool.c: Microsoft threadpool runtime support
   3  *
   4  * Author:
   5  *      Ludovic Henry (ludovic.henry@xamarin.com)
   6  *
   7  * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
   8  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   9  */
  10
  11 //
  12 // Copyright (c) Microsoft. All rights reserved.
  13 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
  14 //
  15 // Files:
  16 //  - src/vm/comthreadpool.cpp
  17 //  - src/vm/win32threadpoolcpp
  18 //  - src/vm/threadpoolrequest.cpp
  19 //  - src/vm/hillclimbing.cpp
  20 //
  21 // Ported from C++ to C and adjusted to Mono runtime
  22
  23 #include <stdlib.h>
  24 #define _USE_MATH_DEFINES // needed by MSVC to define math constants
  25 #include <math.h>
  26 #include <config.h>
  27 #include <glib.h>
  28
  29 #include <mono/metadata/class-internals.h>
  30 #include <mono/metadata/exception.h>
  31 #include <mono/metadata/gc-internals.h>
  32 #include <mono/metadata/object.h>
  33 #include <mono/metadata/object-internals.h>
  34 #include <mono/metadata/threadpool.h>
  35 #include <mono/metadata/threadpool-worker.h>
  36 #include <mono/metadata/threadpool-io.h>
  37 #include <mono/metadata/w32event.h>
  38 #include <mono/utils/atomic.h>
  39 #include <mono/utils/mono-compiler.h>
  40 #include <mono/utils/mono-complex.h>
  41 #include <mono/utils/mono-lazy-init.h>
  42 #include <mono/utils/mono-logger.h>
  43 #include <mono/utils/mono-logger-internals.h>
  44 #include <mono/utils/mono-proclib.h>
  45 #include <mono/utils/mono-threads.h>
  46 #include <mono/utils/mono-time.h>
  47 #include <mono/utils/refcount.h>
  48
  49 typedef struct {
  50         MonoDomain *domain;
  51         /* Number of outstanding jobs */
  52         gint32 outstanding_request;
  53         /* Number of currently executing jobs */
  54         gint32 threadpool_jobs;
  55         /* Signalled when threadpool_jobs + outstanding_request is 0 */
  56         /* Protected by threadpool->domains_lock */
  57         MonoCoopCond cleanup_cond;
  58 } ThreadPoolDomain;
  59
  60 typedef union {
  61         struct {
  62                 gint16 starting; /* starting, but not yet in worker_callback */
  63                 gint16 working; /* executing worker_callback */
  64         } _;
  65         gint32 as_gint32;
  66 } ThreadPoolCounter;
  67
  68 typedef struct {
  69         MonoRefCount ref;
  70
  71         GPtrArray *domains; // ThreadPoolDomain* []
  72         MonoCoopMutex domains_lock;
  73
  74         GPtrArray *threads; // MonoInternalThread* []
  75         MonoCoopMutex threads_lock;
  76         MonoCoopCond threads_exit_cond;
  77
  78         ThreadPoolCounter counters;
  79
  80         gint32 limit_io_min;
  81         gint32 limit_io_max;
  82
  83         MonoThreadPoolWorker *worker;
  84 } ThreadPool;
  85
  86 static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
  87
  88 static ThreadPool* threadpool;
  89
  90 #define COUNTER_ATOMIC(threadpool,var,block) \
  91         do { \
  92                 ThreadPoolCounter __old; \
  93                 do { \
  94                         g_assert (threadpool); \
  95                         (var) = __old = COUNTER_READ (threadpool); \
  96                         { block; } \
  97                         if (!(counter._.starting >= 0)) \
  98                                 g_error ("%s: counter._.starting = %d, but should be >= 0", __func__, counter._.starting); \
  99                         if (!(counter._.working >= 0)) \
 100                                 g_error ("%s: counter._.working = %d, but should be >= 0", __func__, counter._.working); \
 101                 } while (InterlockedCompareExchange (&threadpool->counters.as_gint32, (var).as_gint32, __old.as_gint32) != __old.as_gint32); \
 102         } while (0)
 103
 104 static inline ThreadPoolCounter
 105 COUNTER_READ (ThreadPool *threadpool)
 106 {
 107         ThreadPoolCounter counter;
 108         counter.as_gint32 = InterlockedRead (&threadpool->counters.as_gint32);
 109         return counter;
 110 }
 111
 112 static inline void
 113 domains_lock (void)
 114 {
 115         mono_coop_mutex_lock (&threadpool->domains_lock);
 116 }
 117
 118 static inline void
 119 domains_unlock (void)
 120 {
 121         mono_coop_mutex_unlock (&threadpool->domains_lock);
 122 }
 123
 124 static void
 125 destroy (gpointer unused)
 126 {
 127 #if 0
 128         g_ptr_array_free (threadpool->domains, TRUE);
 129         mono_coop_mutex_destroy (&threadpool->domains_lock);
 130
 131         g_ptr_array_free (threadpool->threads, TRUE);
 132         mono_coop_mutex_destroy (&threadpool->threads_lock);
 133         mono_coop_cond_destroy (&threadpool->threads_exit_cond);
 134
 135         /* We cannot free the threadpool, because there is a race
 136          * on shutdown where a managed thread may request a new
 137          * threadpool thread, but we already destroyed the
 138          * threadpool. So to avoid a use-after-free, we simply do
 139          * not free the threadpool, as we won't be able to access
 140          * the threadpool anyway because the ref count will be 0 */
 141         // g_free (threadpool);
 142 #endif
 143 }
 144
 145 static void
 146 initialize (void)
 147 {
 148         g_assert (!threadpool);
 149         threadpool = g_new0 (ThreadPool, 1);
 150         g_assert (threadpool);
 151
 152         g_assert (sizeof (ThreadPoolCounter) == sizeof (gint32));
 153
 154         mono_refcount_init (threadpool, destroy);
 155
 156         threadpool->domains = g_ptr_array_new ();
 157         mono_coop_mutex_init (&threadpool->domains_lock);
 158
 159         threadpool->threads = g_ptr_array_new ();
 160         mono_coop_mutex_init (&threadpool->threads_lock);
 161         mono_coop_cond_init (&threadpool->threads_exit_cond);
 162
 163         threadpool->limit_io_min = mono_cpu_count ();
 164         threadpool->limit_io_max = CLAMP (threadpool->limit_io_min * 100, MIN (threadpool->limit_io_min, 200), MAX (threadpool->limit_io_min, 200));
 165
 166         mono_threadpool_worker_init (&threadpool->worker);
 167 }
 168
 169 static void
 170 cleanup (void)
 171 {
 172         guint i;
 173         MonoInternalThread *current;
 174
 175         /* we make the assumption along the code that we are
 176          * cleaning up only if the runtime is shutting down */
 177         g_assert (mono_runtime_is_shutting_down ());
 178
 179         current = mono_thread_internal_current ();
 180
 181         mono_coop_mutex_lock (&threadpool->threads_lock);
 182
 183         /* stop all threadpool->threads */
 184         for (i = 0; i < threadpool->threads->len; ++i) {
 185                 MonoInternalThread *thread = (MonoInternalThread*) g_ptr_array_index (threadpool->threads, i);
 186                 if (thread != current)
 187                         mono_thread_internal_abort (thread);
 188         }
 189
 190         mono_coop_mutex_unlock (&threadpool->threads_lock);
 191
 192 #if 0
 193         /* give a chance to the other threads to exit */
 194         mono_thread_info_yield ();
 195
 196         mono_coop_mutex_lock (&threadpool->threads_lock);
 197
 198         for (;;) {
 199                 if (threadpool->threads->len == 0)
 200                         break;
 201
 202                 if (threadpool->threads->len == 1 && g_ptr_array_index (threadpool->threads, 0) == current) {
 203                         /* We are waiting on ourselves */
 204                         break;
 205                 }
 206
 207                 mono_coop_cond_wait (&threadpool->threads_exit_cond, &threadpool->threads_lock);
 208         }
 209
 210         mono_coop_mutex_unlock (&threadpool->threads_lock);
 211 #endif
 212
 213         mono_threadpool_worker_cleanup (threadpool->worker);
 214
 215         mono_refcount_dec (threadpool);
 216 }
 217
 218 gboolean
 219 mono_threadpool_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
 220 {
 221         static MonoClass *threadpool_class = NULL;
 222         static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
 223         MonoDomain *current_domain;
 224         MonoBoolean f;
 225         gpointer args [2];
 226
 227         mono_error_init (error);
 228         g_assert (work_item);
 229
 230         if (!threadpool_class)
 231                 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
 232
 233         if (!unsafe_queue_custom_work_item_method)
 234                 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
 235         g_assert (unsafe_queue_custom_work_item_method);
 236
 237         f = FALSE;
 238
 239         args [0] = (gpointer) work_item;
 240         args [1] = (gpointer) &f;
 241
 242         current_domain = mono_domain_get ();
 243         if (current_domain == domain) {
 244                 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 245                 return_val_if_nok (error, FALSE);
 246         } else {
 247                 mono_thread_push_appdomain_ref (domain);
 248                 if (mono_domain_set (domain, FALSE)) {
 249                         mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 250                         if (!is_ok (error)) {
 251                                 mono_thread_pop_appdomain_ref ();
 252                                 return FALSE;
 253                         }
 254                         mono_domain_set (current_domain, TRUE);
 255                 }
 256                 mono_thread_pop_appdomain_ref ();
 257         }
 258         return TRUE;
 259 }
 260
 261 /* LOCKING: domains_lock must be held */
 262 static void
 263 tpdomain_add (ThreadPoolDomain *tpdomain)
 264 {
 265         guint i, len;
 266
 267         g_assert (tpdomain);
 268
 269         len = threadpool->domains->len;
 270         for (i = 0; i < len; ++i) {
 271                 if (g_ptr_array_index (threadpool->domains, i) == tpdomain)
 272                         break;
 273         }
 274
 275         if (i == len)
 276                 g_ptr_array_add (threadpool->domains, tpdomain);
 277 }
 278
 279 /* LOCKING: domains_lock must be held. */
 280 static gboolean
 281 tpdomain_remove (ThreadPoolDomain *tpdomain)
 282 {
 283         g_assert (tpdomain);
 284         return g_ptr_array_remove (threadpool->domains, tpdomain);
 285 }
 286
 287 /* LOCKING: domains_lock must be held */
 288 static ThreadPoolDomain *
 289 tpdomain_get (MonoDomain *domain, gboolean create)
 290 {
 291         guint i;
 292         ThreadPoolDomain *tpdomain;
 293
 294         g_assert (domain);
 295
 296         for (i = 0; i < threadpool->domains->len; ++i) {
 297                 ThreadPoolDomain *tpdomain;
 298
 299                 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
 300                 if (tpdomain->domain == domain)
 301                         return tpdomain;
 302         }
 303
 304         if (!create)
 305                 return NULL;
 306
 307         tpdomain = g_new0 (ThreadPoolDomain, 1);
 308         tpdomain->domain = domain;
 309         mono_coop_cond_init (&tpdomain->cleanup_cond);
 310
 311         tpdomain_add (tpdomain);
 312
 313         return tpdomain;
 314 }
 315
 316 static void
 317 tpdomain_free (ThreadPoolDomain *tpdomain)
 318 {
 319         g_free (tpdomain);
 320 }
 321
 322 /* LOCKING: domains_lock must be held */
 323 static ThreadPoolDomain *
 324 tpdomain_get_next (ThreadPoolDomain *current)
 325 {
 326         ThreadPoolDomain *tpdomain = NULL;
 327         guint len;
 328
 329         len = threadpool->domains->len;
 330         if (len > 0) {
 331                 guint i, current_idx = -1;
 332                 if (current) {
 333                         for (i = 0; i < len; ++i) {
 334                                 if (current == g_ptr_array_index (threadpool->domains, i)) {
 335                                         current_idx = i;
 336                                         break;
 337                                 }
 338                         }
 339                         g_assert (current_idx != (guint)-1);
 340                 }
 341                 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
 342                         ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i % len);
 343                         if (tmp->outstanding_request > 0) {
 344                                 tpdomain = tmp;
 345                                 break;
 346                         }
 347                 }
 348         }
 349
 350         return tpdomain;
 351 }
 352
 353 static MonoObject*
 354 try_invoke_perform_wait_callback (MonoObject** exc, MonoError *error)
 355 {
 356         HANDLE_FUNCTION_ENTER ();
 357         mono_error_init (error);
 358         MonoObject *res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, exc, error);
 359         HANDLE_FUNCTION_RETURN_VAL (res);
 360 }
 361
 362 static void
 363 worker_callback (gpointer unused)
 364 {
 365         MonoError error;
 366         ThreadPoolDomain *tpdomain, *previous_tpdomain;
 367         ThreadPoolCounter counter;
 368         MonoInternalThread *thread;
 369
 370         thread = mono_thread_internal_current ();
 371
 372         COUNTER_ATOMIC (threadpool, counter, {
 373                 if (!(counter._.working < 32767 /* G_MAXINT16 */))
 374                         g_error ("%s: counter._.working = %d, but should be < 32767", __func__, counter._.working);
 375
 376                 counter._.starting --;
 377                 counter._.working ++;
 378         });
 379
 380         if (mono_runtime_is_shutting_down ()) {
 381                 COUNTER_ATOMIC (threadpool, counter, {
 382                         counter._.working --;
 383                 });
 384
 385                 mono_refcount_dec (threadpool);
 386                 return;
 387         }
 388
 389         mono_coop_mutex_lock (&threadpool->threads_lock);
 390         g_ptr_array_add (threadpool->threads, thread);
 391         mono_coop_mutex_unlock (&threadpool->threads_lock);
 392
 393         /*
 394          * This is needed so there is always an lmf frame in the runtime invoke call below,
 395          * so ThreadAbortExceptions are caught even if the thread is in native code.
 396          */
 397         mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
 398
 399         domains_lock ();
 400
 401         previous_tpdomain = NULL;
 402
 403         while (!mono_runtime_is_shutting_down ()) {
 404                 gboolean retire = FALSE;
 405
 406                 if ((thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) != 0) {
 407                         domains_unlock ();
 408                         mono_thread_interruption_checkpoint ();
 409                         domains_lock ();
 410                 }
 411
 412                 tpdomain = tpdomain_get_next (previous_tpdomain);
 413                 if (!tpdomain)
 414                         break;
 415
 416                 tpdomain->outstanding_request --;
 417                 g_assert (tpdomain->outstanding_request >= 0);
 418
 419                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d)",
 420                         mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
 421
 422                 g_assert (tpdomain->threadpool_jobs >= 0);
 423                 tpdomain->threadpool_jobs ++;
 424
 425                 domains_unlock ();
 426
 427                 mono_thread_set_name_internal (thread, mono_string_new (mono_get_root_domain (), "Threadpool worker"), FALSE, TRUE, &error);
 428                 mono_error_assert_ok (&error);
 429
 430                 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
 431                 if (!mono_thread_test_state (thread , ThreadState_Background))
 432                         ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
 433
 434                 mono_thread_push_appdomain_ref (tpdomain->domain);
 435                 if (mono_domain_set (tpdomain->domain, FALSE)) {
 436                         MonoObject *exc = NULL, *res;
 437
 438                         res = try_invoke_perform_wait_callback (&exc, &error);
 439                         if (exc || !mono_error_ok(&error)) {
 440                                 if (exc == NULL)
 441                                         exc = (MonoObject *) mono_error_convert_to_exception (&error);
 442                                 else
 443                                         mono_error_cleanup (&error);
 444                                 mono_thread_internal_unhandled_exception (exc);
 445                         } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE) {
 446                                 retire = TRUE;
 447                         }
 448
 449                         mono_domain_set (mono_get_root_domain (), TRUE);
 450                 }
 451                 mono_thread_pop_appdomain_ref ();
 452
 453                 domains_lock ();
 454
 455                 tpdomain->threadpool_jobs --;
 456                 g_assert (tpdomain->threadpool_jobs >= 0);
 457
 458                 if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
 459                         gboolean removed;
 460
 461                         removed = tpdomain_remove (tpdomain);
 462                         g_assert (removed);
 463
 464                         mono_coop_cond_signal (&tpdomain->cleanup_cond);
 465                         tpdomain = NULL;
 466                 }
 467
 468                 if (retire)
 469                         break;
 470
 471                 previous_tpdomain = tpdomain;
 472         }
 473
 474         domains_unlock ();
 475
 476         mono_coop_mutex_lock (&threadpool->threads_lock);
 477
 478         g_ptr_array_remove_fast (threadpool->threads, thread);
 479
 480         mono_coop_cond_signal (&threadpool->threads_exit_cond);
 481
 482         mono_coop_mutex_unlock (&threadpool->threads_lock);
 483
 484         COUNTER_ATOMIC (threadpool, counter, {
 485                 counter._.working --;
 486         });
 487
 488         mono_refcount_dec (threadpool);
 489 }
 490
 491 void
 492 mono_threadpool_cleanup (void)
 493 {
 494 #ifndef DISABLE_SOCKETS
 495         mono_threadpool_io_cleanup ();
 496 #endif
 497         mono_lazy_cleanup (&status, cleanup);
 498 }
 499
 500 MonoAsyncResult *
 501 mono_threadpool_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
 502 {
 503         static MonoClass *async_call_klass = NULL;
 504         MonoMethodMessage *message;
 505         MonoAsyncResult *async_result;
 506         MonoAsyncCall *async_call;
 507         MonoDelegate *async_callback = NULL;
 508         MonoObject *state = NULL;
 509
 510         if (!async_call_klass)
 511                 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
 512
 513         mono_lazy_initialize (&status, initialize);
 514
 515         mono_error_init (error);
 516
 517         message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
 518         return_val_if_nok (error, NULL);
 519
 520         async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
 521         return_val_if_nok (error, NULL);
 522
 523         MONO_OBJECT_SETREF (async_call, msg, message);
 524         MONO_OBJECT_SETREF (async_call, state, state);
 525
 526         if (async_callback) {
 527                 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
 528                 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
 529         }
 530
 531         async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
 532         return_val_if_nok (error, NULL);
 533         MONO_OBJECT_SETREF (async_result, async_delegate, target);
 534
 535         mono_threadpool_enqueue_work_item (domain, (MonoObject*) async_result, error);
 536         return_val_if_nok (error, NULL);
 537
 538         return async_result;
 539 }
 540
 541 MonoObject *
 542 mono_threadpool_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
 543 {
 544         MonoAsyncCall *ac;
 545
 546         mono_error_init (error);
 547         g_assert (exc);
 548         g_assert (out_args);
 549
 550         *exc = NULL;
 551         *out_args = NULL;
 552
 553         /* check if already finished */
 554         mono_monitor_enter ((MonoObject*) ares);
 555
 556         if (ares->endinvoke_called) {
 557                 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
 558                 mono_monitor_exit ((MonoObject*) ares);
 559                 return NULL;
 560         }
 561
 562         ares->endinvoke_called = 1;
 563
 564         /* wait until we are really finished */
 565         if (ares->completed) {
 566                 mono_monitor_exit ((MonoObject *) ares);
 567         } else {
 568                 gpointer wait_event;
 569                 if (ares->handle) {
 570                         wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
 571                 } else {
 572                         wait_event = mono_w32event_create (TRUE, FALSE);
 573                         g_assert(wait_event);
 574                         MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
 575                         if (!is_ok (error)) {
 576                                 mono_w32event_close (wait_event);
 577                                 return NULL;
 578                         }
 579                         MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
 580                 }
 581                 mono_monitor_exit ((MonoObject*) ares);
 582                 MONO_ENTER_GC_SAFE;
 583 #ifdef HOST_WIN32
 584                 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
 585 #else
 586                 mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
 587 #endif
 588                 MONO_EXIT_GC_SAFE;
 589         }
 590
 591         ac = (MonoAsyncCall*) ares->object_data;
 592         g_assert (ac);
 593
 594         *exc = ac->msg->exc; /* FIXME: GC add write barrier */
 595         *out_args = ac->out_args;
 596         return ac->res;
 597 }
 598
 599 gboolean
 600 mono_threadpool_remove_domain_jobs (MonoDomain *domain, int timeout)
 601 {
 602         gint64 end;
 603         ThreadPoolDomain *tpdomain;
 604         gboolean ret;
 605
 606         g_assert (domain);
 607         g_assert (timeout >= -1);
 608
 609         g_assert (mono_domain_is_unloading (domain));
 610
 611         if (timeout != -1)
 612                 end = mono_msec_ticks () + timeout;
 613
 614 #ifndef DISABLE_SOCKETS
 615         mono_threadpool_io_remove_domain_jobs (domain);
 616         if (timeout != -1) {
 617                 if (mono_msec_ticks () > end)
 618                         return FALSE;
 619         }
 620 #endif
 621
 622         /*
 623          * Wait for all threads which execute jobs in the domain to exit.
 624          * The is_unloading () check in worker_request () ensures that
 625          * no new jobs are added after we enter the lock below.
 626          */
 627
 628         if (!mono_lazy_is_initialized (&status))
 629                 return TRUE;
 630
 631         mono_refcount_inc (threadpool);
 632
 633         domains_lock ();
 634
 635         tpdomain = tpdomain_get (domain, FALSE);
 636         if (!tpdomain) {
 637                 domains_unlock ();
 638                 mono_refcount_dec (threadpool);
 639                 return TRUE;
 640         }
 641
 642         ret = TRUE;
 643
 644         while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
 645                 if (timeout == -1) {
 646                         mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool->domains_lock);
 647                 } else {
 648                         gint64 now;
 649                         gint res;
 650
 651                         now = mono_msec_ticks();
 652                         if (now > end) {
 653                                 ret = FALSE;
 654                                 break;
 655                         }
 656
 657                         res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool->domains_lock, end - now);
 658                         if (res != 0) {
 659                                 ret = FALSE;
 660                                 break;
 661                         }
 662                 }
 663         }
 664
 665         /* Remove from the list the worker threads look at */
 666         tpdomain_remove (tpdomain);
 667
 668         domains_unlock ();
 669
 670         mono_coop_cond_destroy (&tpdomain->cleanup_cond);
 671         tpdomain_free (tpdomain);
 672
 673         mono_refcount_dec (threadpool);
 674
 675         return ret;
 676 }
 677
 678 void
 679 mono_threadpool_suspend (void)
 680 {
 681         if (threadpool)
 682                 mono_threadpool_worker_set_suspended (threadpool->worker, TRUE);
 683 }
 684
 685 void
 686 mono_threadpool_resume (void)
 687 {
 688         if (threadpool)
 689                 mono_threadpool_worker_set_suspended (threadpool->worker, FALSE);
 690 }
 691
 692 void
 693 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 694 {
 695         ThreadPoolCounter counter;
 696
 697         if (!worker_threads || !completion_port_threads)
 698                 return;
 699
 700         mono_lazy_initialize (&status, initialize);
 701
 702         counter = COUNTER_READ (threadpool);
 703
 704         *worker_threads = MAX (0, mono_threadpool_worker_get_max (threadpool->worker) - counter._.working);
 705         *completion_port_threads = threadpool->limit_io_max;
 706 }
 707
 708 void
 709 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 710 {
 711         if (!worker_threads || !completion_port_threads)
 712                 return;
 713
 714         mono_lazy_initialize (&status, initialize);
 715
 716         *worker_threads = mono_threadpool_worker_get_min (threadpool->worker);
 717         *completion_port_threads = threadpool->limit_io_min;
 718 }
 719
 720 void
 721 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 722 {
 723         if (!worker_threads || !completion_port_threads)
 724                 return;
 725
 726         mono_lazy_initialize (&status, initialize);
 727
 728         *worker_threads = mono_threadpool_worker_get_max (threadpool->worker);
 729         *completion_port_threads = threadpool->limit_io_max;
 730 }
 731
 732 MonoBoolean
 733 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 734 {
 735         mono_lazy_initialize (&status, initialize);
 736
 737         if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
 738                 return FALSE;
 739
 740         if (!mono_threadpool_worker_set_min (threadpool->worker, worker_threads))
 741                 return FALSE;
 742
 743         threadpool->limit_io_min = completion_port_threads;
 744
 745         return TRUE;
 746 }
 747
 748 MonoBoolean
 749 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 750 {
 751         gint cpu_count = mono_cpu_count ();
 752
 753         mono_lazy_initialize (&status, initialize);
 754
 755         if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
 756                 return FALSE;
 757
 758         if (!mono_threadpool_worker_set_max (threadpool->worker, worker_threads))
 759                 return FALSE;
 760
 761         threadpool->limit_io_max = completion_port_threads;
 762
 763         return TRUE;
 764 }
 765
 766 void
 767 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
 768 {
 769         if (enable_worker_tracking) {
 770                 // TODO implement some kind of switch to have the possibily to use it
 771                 *enable_worker_tracking = FALSE;
 772         }
 773
 774         mono_lazy_initialize (&status, initialize);
 775 }
 776
 777 MonoBoolean
 778 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
 779 {
 780         if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
 781                 return FALSE;
 782
 783         return mono_threadpool_worker_notify_completed (threadpool->worker);
 784 }
 785
 786 void
 787 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
 788 {
 789         mono_threadpool_worker_notify_completed (threadpool->worker);
 790 }
 791
 792 void
 793 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
 794 {
 795         // TODO
 796         MonoError error;
 797         mono_error_set_not_implemented (&error, "");
 798         mono_error_set_pending_exception (&error);
 799 }
 800
 801 MonoBoolean
 802 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
 803 {
 804         MonoDomain *domain;
 805         ThreadPoolDomain *tpdomain;
 806         ThreadPoolCounter counter;
 807
 808         domain = mono_domain_get ();
 809         if (mono_domain_is_unloading (domain))
 810                 return FALSE;
 811
 812         if (!mono_refcount_tryinc (threadpool)) {
 813                 /* threadpool has been destroyed, we are shutting down */
 814                 return FALSE;
 815         }
 816
 817         domains_lock ();
 818
 819         /* synchronize with mono_threadpool_remove_domain_jobs */
 820         if (mono_domain_is_unloading (domain)) {
 821                 domains_unlock ();
 822                 mono_refcount_dec (threadpool);
 823                 return FALSE;
 824         }
 825
 826         tpdomain = tpdomain_get (domain, TRUE);
 827         g_assert (tpdomain);
 828
 829         tpdomain->outstanding_request ++;
 830         g_assert (tpdomain->outstanding_request >= 1);
 831
 832         domains_unlock ();
 833
 834         COUNTER_ATOMIC (threadpool, counter, {
 835                 if (counter._.starting == 16) {
 836                         mono_refcount_dec (threadpool);
 837                         return TRUE;
 838                 }
 839
 840                 counter._.starting ++;
 841         });
 842
 843         mono_threadpool_worker_enqueue (threadpool->worker, worker_callback, NULL);
 844
 845         return TRUE;
 846 }
 847
 848 MonoBoolean G_GNUC_UNUSED
 849 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
 850 {
 851         /* This copy the behavior of the current Mono implementation */
 852         MonoError error;
 853         mono_error_set_not_implemented (&error, "");
 854         mono_error_set_pending_exception (&error);
 855         return FALSE;
 856 }
 857
 858 MonoBoolean G_GNUC_UNUSED
 859 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
 860 {
 861         /* This copy the behavior of the current Mono implementation */
 862         return TRUE;
 863 }
 864
 865 MonoBoolean G_GNUC_UNUSED
 866 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)
 867 {
 868         return FALSE;
 869 }