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