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