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         g_ptr_array_free (threadpool->domains, TRUE);
 128         mono_coop_mutex_destroy (&threadpool->domains_lock);
 129
 130         g_ptr_array_free (threadpool->threads, TRUE);
 131         mono_coop_mutex_destroy (&threadpool->threads_lock);
 132         mono_coop_cond_destroy (&threadpool->threads_exit_cond);
 133
 134         /* We cannot free the threadpool, because there is a race
 135          * on shutdown where a managed thread may request a new
 136          * threadpool thread, but we already destroyed the
 137          * threadpool. So to avoid a use-after-free, we simply do
 138          * not free the threadpool, as we won't be able to access
 139          * the threadpool anyway because the ref count will be 0 */
 140         // g_free (threadpool);
 141 }
 142
 143 static void
 144 initialize (void)
 145 {
 146         g_assert (!threadpool);
 147         threadpool = g_new0 (ThreadPool, 1);
 148         g_assert (threadpool);
 149
 150         g_assert (sizeof (ThreadPoolCounter) == sizeof (gint32));
 151
 152         mono_refcount_init (threadpool, destroy);
 153
 154         threadpool->domains = g_ptr_array_new ();
 155         mono_coop_mutex_init (&threadpool->domains_lock);
 156
 157         threadpool->threads = g_ptr_array_new ();
 158         mono_coop_mutex_init (&threadpool->threads_lock);
 159         mono_coop_cond_init (&threadpool->threads_exit_cond);
 160
 161         threadpool->limit_io_min = mono_cpu_count ();
 162         threadpool->limit_io_max = CLAMP (threadpool->limit_io_min * 100, MIN (threadpool->limit_io_min, 200), MAX (threadpool->limit_io_min, 200));
 163
 164         mono_threadpool_worker_init (&threadpool->worker);
 165 }
 166
 167 static void
 168 cleanup (void)
 169 {
 170         guint i;
 171         MonoInternalThread *current;
 172
 173         /* we make the assumption along the code that we are
 174          * cleaning up only if the runtime is shutting down */
 175         g_assert (mono_runtime_is_shutting_down ());
 176
 177         current = mono_thread_internal_current ();
 178
 179         mono_coop_mutex_lock (&threadpool->threads_lock);
 180
 181         /* stop all threadpool->threads */
 182         for (i = 0; i < threadpool->threads->len; ++i) {
 183                 MonoInternalThread *thread = (MonoInternalThread*) g_ptr_array_index (threadpool->threads, i);
 184                 if (thread != current)
 185                         mono_thread_internal_abort (thread);
 186         }
 187
 188         mono_coop_mutex_unlock (&threadpool->threads_lock);
 189
 190 #if 0
 191         /* give a chance to the other threads to exit */
 192         mono_thread_info_yield ();
 193
 194         mono_coop_mutex_lock (&threadpool->threads_lock);
 195
 196         for (;;) {
 197                 if (threadpool->threads->len == 0)
 198                         break;
 199
 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                 mono_coop_cond_wait (&threadpool->threads_exit_cond, &threadpool->threads_lock);
 206         }
 207
 208         mono_coop_mutex_unlock (&threadpool->threads_lock);
 209 #endif
 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 MonoObject*
 352 try_invoke_perform_wait_callback (MonoObject** exc, MonoError *error)
 353 {
 354         HANDLE_FUNCTION_ENTER ();
 355         mono_error_init (error);
 356         MonoObject *res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, exc, error);
 357         HANDLE_FUNCTION_RETURN_VAL (res);
 358 }
 359
 360 static void
 361 worker_callback (gpointer unused)
 362 {
 363         MonoError error;
 364         ThreadPoolDomain *tpdomain, *previous_tpdomain;
 365         ThreadPoolCounter counter;
 366         MonoInternalThread *thread;
 367
 368         thread = mono_thread_internal_current ();
 369
 370         COUNTER_ATOMIC (threadpool, counter, {
 371                 if (!(counter._.working < 32767 /* G_MAXINT16 */))
 372                         g_error ("%s: counter._.working = %d, but should be < 32767", __func__, counter._.working);
 373
 374                 counter._.starting --;
 375                 counter._.working ++;
 376         });
 377
 378         if (mono_runtime_is_shutting_down ()) {
 379                 COUNTER_ATOMIC (threadpool, counter, {
 380                         counter._.working --;
 381                 });
 382
 383                 mono_refcount_dec (threadpool);
 384                 return;
 385         }
 386
 387         mono_coop_mutex_lock (&threadpool->threads_lock);
 388         g_ptr_array_add (threadpool->threads, thread);
 389         mono_coop_mutex_unlock (&threadpool->threads_lock);
 390
 391         /*
 392          * This is needed so there is always an lmf frame in the runtime invoke call below,
 393          * so ThreadAbortExceptions are caught even if the thread is in native code.
 394          */
 395         mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
 396
 397         domains_lock ();
 398
 399         previous_tpdomain = NULL;
 400
 401         while (!mono_runtime_is_shutting_down ()) {
 402                 gboolean retire = FALSE;
 403
 404                 if ((thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) != 0) {
 405                         domains_unlock ();
 406                         mono_thread_interruption_checkpoint ();
 407                         domains_lock ();
 408                 }
 409
 410                 tpdomain = tpdomain_get_next (previous_tpdomain);
 411                 if (!tpdomain)
 412                         break;
 413
 414                 tpdomain->outstanding_request --;
 415                 g_assert (tpdomain->outstanding_request >= 0);
 416
 417                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d)",
 418                         mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
 419
 420                 g_assert (tpdomain->threadpool_jobs >= 0);
 421                 tpdomain->threadpool_jobs ++;
 422
 423                 domains_unlock ();
 424
 425                 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
 426                 if (!mono_thread_test_state (thread , ThreadState_Background))
 427                         ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
 428
 429                 mono_thread_push_appdomain_ref (tpdomain->domain);
 430                 if (mono_domain_set (tpdomain->domain, FALSE)) {
 431                         MonoObject *exc = NULL, *res;
 432
 433                         res = try_invoke_perform_wait_callback (&exc, &error);
 434                         if (exc || !mono_error_ok(&error)) {
 435                                 if (exc == NULL)
 436                                         exc = (MonoObject *) mono_error_convert_to_exception (&error);
 437                                 else
 438                                         mono_error_cleanup (&error);
 439                                 mono_thread_internal_unhandled_exception (exc);
 440                         } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE) {
 441                                 retire = TRUE;
 442                         }
 443
 444                         mono_domain_set (mono_get_root_domain (), TRUE);
 445                 }
 446                 mono_thread_pop_appdomain_ref ();
 447
 448                 domains_lock ();
 449
 450                 tpdomain->threadpool_jobs --;
 451                 g_assert (tpdomain->threadpool_jobs >= 0);
 452
 453                 if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
 454                         gboolean removed;
 455
 456                         removed = tpdomain_remove (tpdomain);
 457                         g_assert (removed);
 458
 459                         mono_coop_cond_signal (&tpdomain->cleanup_cond);
 460                         tpdomain = NULL;
 461                 }
 462
 463                 if (retire)
 464                         break;
 465
 466                 previous_tpdomain = tpdomain;
 467         }
 468
 469         domains_unlock ();
 470
 471         mono_coop_mutex_lock (&threadpool->threads_lock);
 472
 473         g_ptr_array_remove_fast (threadpool->threads, thread);
 474
 475         mono_coop_cond_signal (&threadpool->threads_exit_cond);
 476
 477         mono_coop_mutex_unlock (&threadpool->threads_lock);
 478
 479         COUNTER_ATOMIC (threadpool, counter, {
 480                 counter._.working --;
 481         });
 482
 483         mono_refcount_dec (threadpool);
 484 }
 485
 486 void
 487 mono_threadpool_cleanup (void)
 488 {
 489 #ifndef DISABLE_SOCKETS
 490         mono_threadpool_io_cleanup ();
 491 #endif
 492         mono_lazy_cleanup (&status, cleanup);
 493 }
 494
 495 MonoAsyncResult *
 496 mono_threadpool_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
 497 {
 498         static MonoClass *async_call_klass = NULL;
 499         MonoMethodMessage *message;
 500         MonoAsyncResult *async_result;
 501         MonoAsyncCall *async_call;
 502         MonoDelegate *async_callback = NULL;
 503         MonoObject *state = NULL;
 504
 505         if (!async_call_klass)
 506                 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
 507
 508         mono_lazy_initialize (&status, initialize);
 509
 510         mono_error_init (error);
 511
 512         message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
 513         return_val_if_nok (error, NULL);
 514
 515         async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
 516         return_val_if_nok (error, NULL);
 517
 518         MONO_OBJECT_SETREF (async_call, msg, message);
 519         MONO_OBJECT_SETREF (async_call, state, state);
 520
 521         if (async_callback) {
 522                 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
 523                 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
 524         }
 525
 526         async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
 527         return_val_if_nok (error, NULL);
 528         MONO_OBJECT_SETREF (async_result, async_delegate, target);
 529
 530         mono_threadpool_enqueue_work_item (domain, (MonoObject*) async_result, error);
 531         return_val_if_nok (error, NULL);
 532
 533         return async_result;
 534 }
 535
 536 MonoObject *
 537 mono_threadpool_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
 538 {
 539         MonoAsyncCall *ac;
 540
 541         mono_error_init (error);
 542         g_assert (exc);
 543         g_assert (out_args);
 544
 545         *exc = NULL;
 546         *out_args = NULL;
 547
 548         /* check if already finished */
 549         mono_monitor_enter ((MonoObject*) ares);
 550
 551         if (ares->endinvoke_called) {
 552                 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
 553                 mono_monitor_exit ((MonoObject*) ares);
 554                 return NULL;
 555         }
 556
 557         ares->endinvoke_called = 1;
 558
 559         /* wait until we are really finished */
 560         if (ares->completed) {
 561                 mono_monitor_exit ((MonoObject *) ares);
 562         } else {
 563                 gpointer wait_event;
 564                 if (ares->handle) {
 565                         wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
 566                 } else {
 567                         wait_event = mono_w32event_create (TRUE, FALSE);
 568                         g_assert(wait_event);
 569                         MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
 570                         if (!is_ok (error)) {
 571                                 mono_w32event_close (wait_event);
 572                                 return NULL;
 573                         }
 574                         MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
 575                 }
 576                 mono_monitor_exit ((MonoObject*) ares);
 577                 MONO_ENTER_GC_SAFE;
 578 #ifdef HOST_WIN32
 579                 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
 580 #else
 581                 mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
 582 #endif
 583                 MONO_EXIT_GC_SAFE;
 584         }
 585
 586         ac = (MonoAsyncCall*) ares->object_data;
 587         g_assert (ac);
 588
 589         *exc = ac->msg->exc; /* FIXME: GC add write barrier */
 590         *out_args = ac->out_args;
 591         return ac->res;
 592 }
 593
 594 gboolean
 595 mono_threadpool_remove_domain_jobs (MonoDomain *domain, int timeout)
 596 {
 597         gint64 end;
 598         ThreadPoolDomain *tpdomain;
 599         gboolean ret;
 600
 601         g_assert (domain);
 602         g_assert (timeout >= -1);
 603
 604         g_assert (mono_domain_is_unloading (domain));
 605
 606         if (timeout != -1)
 607                 end = mono_msec_ticks () + timeout;
 608
 609 #ifndef DISABLE_SOCKETS
 610         mono_threadpool_io_remove_domain_jobs (domain);
 611         if (timeout != -1) {
 612                 if (mono_msec_ticks () > end)
 613                         return FALSE;
 614         }
 615 #endif
 616
 617         /*
 618          * Wait for all threads which execute jobs in the domain to exit.
 619          * The is_unloading () check in worker_request () ensures that
 620          * no new jobs are added after we enter the lock below.
 621          */
 622
 623         if (!mono_lazy_is_initialized (&status))
 624                 return TRUE;
 625
 626         mono_refcount_inc (threadpool);
 627
 628         domains_lock ();
 629
 630         tpdomain = tpdomain_get (domain, FALSE);
 631         if (!tpdomain) {
 632                 domains_unlock ();
 633                 mono_refcount_dec (threadpool);
 634                 return TRUE;
 635         }
 636
 637         ret = TRUE;
 638
 639         while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
 640                 if (timeout == -1) {
 641                         mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool->domains_lock);
 642                 } else {
 643                         gint64 now;
 644                         gint res;
 645
 646                         now = mono_msec_ticks();
 647                         if (now > end) {
 648                                 ret = FALSE;
 649                                 break;
 650                         }
 651
 652                         res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool->domains_lock, end - now);
 653                         if (res != 0) {
 654                                 ret = FALSE;
 655                                 break;
 656                         }
 657                 }
 658         }
 659
 660         /* Remove from the list the worker threads look at */
 661         tpdomain_remove (tpdomain);
 662
 663         domains_unlock ();
 664
 665         mono_coop_cond_destroy (&tpdomain->cleanup_cond);
 666         tpdomain_free (tpdomain);
 667
 668         mono_refcount_dec (threadpool);
 669
 670         return ret;
 671 }
 672
 673 void
 674 mono_threadpool_suspend (void)
 675 {
 676         if (threadpool)
 677                 mono_threadpool_worker_set_suspended (threadpool->worker, TRUE);
 678 }
 679
 680 void
 681 mono_threadpool_resume (void)
 682 {
 683         if (threadpool)
 684                 mono_threadpool_worker_set_suspended (threadpool->worker, FALSE);
 685 }
 686
 687 void
 688 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 689 {
 690         ThreadPoolCounter counter;
 691
 692         if (!worker_threads || !completion_port_threads)
 693                 return;
 694
 695         mono_lazy_initialize (&status, initialize);
 696
 697         counter = COUNTER_READ (threadpool);
 698
 699         *worker_threads = MAX (0, mono_threadpool_worker_get_max (threadpool->worker) - counter._.working);
 700         *completion_port_threads = threadpool->limit_io_max;
 701 }
 702
 703 void
 704 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 705 {
 706         if (!worker_threads || !completion_port_threads)
 707                 return;
 708
 709         mono_lazy_initialize (&status, initialize);
 710
 711         *worker_threads = mono_threadpool_worker_get_min (threadpool->worker);
 712         *completion_port_threads = threadpool->limit_io_min;
 713 }
 714
 715 void
 716 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 717 {
 718         if (!worker_threads || !completion_port_threads)
 719                 return;
 720
 721         mono_lazy_initialize (&status, initialize);
 722
 723         *worker_threads = mono_threadpool_worker_get_max (threadpool->worker);
 724         *completion_port_threads = threadpool->limit_io_max;
 725 }
 726
 727 MonoBoolean
 728 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 729 {
 730         mono_lazy_initialize (&status, initialize);
 731
 732         if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
 733                 return FALSE;
 734
 735         if (!mono_threadpool_worker_set_min (threadpool->worker, worker_threads))
 736                 return FALSE;
 737
 738         threadpool->limit_io_min = completion_port_threads;
 739
 740         return TRUE;
 741 }
 742
 743 MonoBoolean
 744 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 745 {
 746         gint cpu_count = mono_cpu_count ();
 747
 748         mono_lazy_initialize (&status, initialize);
 749
 750         if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
 751                 return FALSE;
 752
 753         if (!mono_threadpool_worker_set_max (threadpool->worker, worker_threads))
 754                 return FALSE;
 755
 756         threadpool->limit_io_max = completion_port_threads;
 757
 758         return TRUE;
 759 }
 760
 761 void
 762 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
 763 {
 764         if (enable_worker_tracking) {
 765                 // TODO implement some kind of switch to have the possibily to use it
 766                 *enable_worker_tracking = FALSE;
 767         }
 768
 769         mono_lazy_initialize (&status, initialize);
 770 }
 771
 772 MonoBoolean
 773 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
 774 {
 775         if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
 776                 return FALSE;
 777
 778         return mono_threadpool_worker_notify_completed (threadpool->worker);
 779 }
 780
 781 void
 782 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
 783 {
 784         mono_threadpool_worker_notify_completed (threadpool->worker);
 785 }
 786
 787 void
 788 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
 789 {
 790         // TODO
 791         MonoError error;
 792         mono_error_set_not_implemented (&error, "");
 793         mono_error_set_pending_exception (&error);
 794 }
 795
 796 MonoBoolean
 797 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
 798 {
 799         MonoDomain *domain;
 800         ThreadPoolDomain *tpdomain;
 801         ThreadPoolCounter counter;
 802
 803         domain = mono_domain_get ();
 804         if (mono_domain_is_unloading (domain))
 805                 return FALSE;
 806
 807         if (!mono_refcount_tryinc (threadpool)) {
 808                 /* threadpool has been destroyed, we are shutting down */
 809                 return FALSE;
 810         }
 811
 812         domains_lock ();
 813
 814         /* synchronize with mono_threadpool_remove_domain_jobs */
 815         if (mono_domain_is_unloading (domain)) {
 816                 domains_unlock ();
 817                 mono_refcount_dec (threadpool);
 818                 return FALSE;
 819         }
 820
 821         tpdomain = tpdomain_get (domain, TRUE);
 822         g_assert (tpdomain);
 823
 824         tpdomain->outstanding_request ++;
 825         g_assert (tpdomain->outstanding_request >= 1);
 826
 827         domains_unlock ();
 828
 829         COUNTER_ATOMIC (threadpool, counter, {
 830                 if (counter._.starting == 16) {
 831                         mono_refcount_dec (threadpool);
 832                         return TRUE;
 833                 }
 834
 835                 counter._.starting ++;
 836         });
 837
 838         mono_threadpool_worker_enqueue (threadpool->worker, worker_callback, NULL);
 839
 840         return TRUE;
 841 }
 842
 843 MonoBoolean G_GNUC_UNUSED
 844 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
 845 {
 846         /* This copy the behavior of the current Mono implementation */
 847         MonoError error;
 848         mono_error_set_not_implemented (&error, "");
 849         mono_error_set_pending_exception (&error);
 850         return FALSE;
 851 }
 852
 853 MonoBoolean G_GNUC_UNUSED
 854 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
 855 {
 856         /* This copy the behavior of the current Mono implementation */
 857         return TRUE;
 858 }
 859
 860 MonoBoolean G_GNUC_UNUSED
 861 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)
 862 {
 863         return FALSE;
 864 }