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         /* give a chance to the other threads to exit */
 191         mono_thread_info_yield ();
 192
 193         mono_coop_mutex_lock (&threadpool->threads_lock);
 194
 195         for (;;) {
 196                 if (threadpool->threads->len == 0)
 197                         break;
 198
 199                 if (threadpool->threads->len == 1 && g_ptr_array_index (threadpool->threads, 0) == current) {
 200                         /* We are waiting on ourselves */
 201                         break;
 202                 }
 203
 204                 mono_coop_cond_wait (&threadpool->threads_exit_cond, &threadpool->threads_lock);
 205         }
 206
 207         mono_coop_mutex_unlock (&threadpool->threads_lock);
 208
 209         mono_threadpool_worker_cleanup (threadpool->worker);
 210
 211         mono_refcount_dec (threadpool);
 212 }
 213
 214 gboolean
 215 mono_threadpool_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
 216 {
 217         static MonoClass *threadpool_class = NULL;
 218         static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
 219         MonoDomain *current_domain;
 220         MonoBoolean f;
 221         gpointer args [2];
 222
 223         mono_error_init (error);
 224         g_assert (work_item);
 225
 226         if (!threadpool_class)
 227                 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
 228
 229         if (!unsafe_queue_custom_work_item_method)
 230                 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
 231         g_assert (unsafe_queue_custom_work_item_method);
 232
 233         f = FALSE;
 234
 235         args [0] = (gpointer) work_item;
 236         args [1] = (gpointer) &f;
 237
 238         current_domain = mono_domain_get ();
 239         if (current_domain == domain) {
 240                 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 241                 return_val_if_nok (error, FALSE);
 242         } else {
 243                 mono_thread_push_appdomain_ref (domain);
 244                 if (mono_domain_set (domain, FALSE)) {
 245                         mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 246                         if (!is_ok (error)) {
 247                                 mono_thread_pop_appdomain_ref ();
 248                                 return FALSE;
 249                         }
 250                         mono_domain_set (current_domain, TRUE);
 251                 }
 252                 mono_thread_pop_appdomain_ref ();
 253         }
 254         return TRUE;
 255 }
 256
 257 /* LOCKING: domains_lock must be held */
 258 static void
 259 tpdomain_add (ThreadPoolDomain *tpdomain)
 260 {
 261         guint i, len;
 262
 263         g_assert (tpdomain);
 264
 265         len = threadpool->domains->len;
 266         for (i = 0; i < len; ++i) {
 267                 if (g_ptr_array_index (threadpool->domains, i) == tpdomain)
 268                         break;
 269         }
 270
 271         if (i == len)
 272                 g_ptr_array_add (threadpool->domains, tpdomain);
 273 }
 274
 275 /* LOCKING: domains_lock must be held. */
 276 static gboolean
 277 tpdomain_remove (ThreadPoolDomain *tpdomain)
 278 {
 279         g_assert (tpdomain);
 280         return g_ptr_array_remove (threadpool->domains, tpdomain);
 281 }
 282
 283 /* LOCKING: domains_lock must be held */
 284 static ThreadPoolDomain *
 285 tpdomain_get (MonoDomain *domain, gboolean create)
 286 {
 287         guint i;
 288         ThreadPoolDomain *tpdomain;
 289
 290         g_assert (domain);
 291
 292         for (i = 0; i < threadpool->domains->len; ++i) {
 293                 ThreadPoolDomain *tpdomain;
 294
 295                 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
 296                 if (tpdomain->domain == domain)
 297                         return tpdomain;
 298         }
 299
 300         if (!create)
 301                 return NULL;
 302
 303         tpdomain = g_new0 (ThreadPoolDomain, 1);
 304         tpdomain->domain = domain;
 305         mono_coop_cond_init (&tpdomain->cleanup_cond);
 306
 307         tpdomain_add (tpdomain);
 308
 309         return tpdomain;
 310 }
 311
 312 static void
 313 tpdomain_free (ThreadPoolDomain *tpdomain)
 314 {
 315         g_free (tpdomain);
 316 }
 317
 318 /* LOCKING: domains_lock must be held */
 319 static ThreadPoolDomain *
 320 tpdomain_get_next (ThreadPoolDomain *current)
 321 {
 322         ThreadPoolDomain *tpdomain = NULL;
 323         guint len;
 324
 325         len = threadpool->domains->len;
 326         if (len > 0) {
 327                 guint i, current_idx = -1;
 328                 if (current) {
 329                         for (i = 0; i < len; ++i) {
 330                                 if (current == g_ptr_array_index (threadpool->domains, i)) {
 331                                         current_idx = i;
 332                                         break;
 333                                 }
 334                         }
 335                         g_assert (current_idx != (guint)-1);
 336                 }
 337                 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
 338                         ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i % len);
 339                         if (tmp->outstanding_request > 0) {
 340                                 tpdomain = tmp;
 341                                 break;
 342                         }
 343                 }
 344         }
 345
 346         return tpdomain;
 347 }
 348
 349 static MonoObject*
 350 try_invoke_perform_wait_callback (MonoObject** exc, MonoError *error)
 351 {
 352         HANDLE_FUNCTION_ENTER ();
 353         mono_error_init (error);
 354         MonoObject *res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, exc, error);
 355         HANDLE_FUNCTION_RETURN_VAL (res);
 356 }
 357
 358 static void
 359 worker_callback (gpointer unused)
 360 {
 361         MonoError error;
 362         ThreadPoolDomain *tpdomain, *previous_tpdomain;
 363         ThreadPoolCounter counter;
 364         MonoInternalThread *thread;
 365
 366         thread = mono_thread_internal_current ();
 367
 368         COUNTER_ATOMIC (threadpool, counter, {
 369                 if (!(counter._.working < 32767 /* G_MAXINT16 */))
 370                         g_error ("%s: counter._.working = %d, but should be < 32767", __func__, counter._.working);
 371
 372                 counter._.starting --;
 373                 counter._.working ++;
 374         });
 375
 376         if (mono_runtime_is_shutting_down ()) {
 377                 COUNTER_ATOMIC (threadpool, counter, {
 378                         counter._.working --;
 379                 });
 380
 381                 mono_refcount_dec (threadpool);
 382                 return;
 383         }
 384
 385         mono_coop_mutex_lock (&threadpool->threads_lock);
 386         g_ptr_array_add (threadpool->threads, thread);
 387         mono_coop_mutex_unlock (&threadpool->threads_lock);
 388
 389         /*
 390          * This is needed so there is always an lmf frame in the runtime invoke call below,
 391          * so ThreadAbortExceptions are caught even if the thread is in native code.
 392          */
 393         mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
 394
 395         domains_lock ();
 396
 397         previous_tpdomain = NULL;
 398
 399         while (!mono_runtime_is_shutting_down ()) {
 400                 gboolean retire = FALSE;
 401
 402                 if ((thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) != 0) {
 403                         domains_unlock ();
 404                         mono_thread_interruption_checkpoint ();
 405                         domains_lock ();
 406                 }
 407
 408                 tpdomain = tpdomain_get_next (previous_tpdomain);
 409                 if (!tpdomain)
 410                         break;
 411
 412                 tpdomain->outstanding_request --;
 413                 g_assert (tpdomain->outstanding_request >= 0);
 414
 415                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d)",
 416                         mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
 417
 418                 g_assert (tpdomain->threadpool_jobs >= 0);
 419                 tpdomain->threadpool_jobs ++;
 420
 421                 domains_unlock ();
 422
 423                 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
 424                 if (!mono_thread_test_state (thread , ThreadState_Background))
 425                         ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
 426
 427                 mono_thread_push_appdomain_ref (tpdomain->domain);
 428                 if (mono_domain_set (tpdomain->domain, FALSE)) {
 429                         MonoObject *exc = NULL, *res;
 430
 431                         res = try_invoke_perform_wait_callback (&exc, &error);
 432                         if (exc || !mono_error_ok(&error)) {
 433                                 if (exc == NULL)
 434                                         exc = (MonoObject *) mono_error_convert_to_exception (&error);
 435                                 else
 436                                         mono_error_cleanup (&error);
 437                                 mono_thread_internal_unhandled_exception (exc);
 438                         } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE) {
 439                                 retire = TRUE;
 440                         }
 441
 442                         mono_domain_set (mono_get_root_domain (), TRUE);
 443                 }
 444                 mono_thread_pop_appdomain_ref ();
 445
 446                 domains_lock ();
 447
 448                 tpdomain->threadpool_jobs --;
 449                 g_assert (tpdomain->threadpool_jobs >= 0);
 450
 451                 if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
 452                         gboolean removed;
 453
 454                         removed = tpdomain_remove (tpdomain);
 455                         g_assert (removed);
 456
 457                         mono_coop_cond_signal (&tpdomain->cleanup_cond);
 458                         tpdomain = NULL;
 459                 }
 460
 461                 if (retire)
 462                         break;
 463
 464                 previous_tpdomain = tpdomain;
 465         }
 466
 467         domains_unlock ();
 468
 469         mono_coop_mutex_lock (&threadpool->threads_lock);
 470
 471         g_ptr_array_remove_fast (threadpool->threads, thread);
 472
 473         mono_coop_cond_signal (&threadpool->threads_exit_cond);
 474
 475         mono_coop_mutex_unlock (&threadpool->threads_lock);
 476
 477         COUNTER_ATOMIC (threadpool, counter, {
 478                 counter._.working --;
 479         });
 480
 481         mono_refcount_dec (threadpool);
 482 }
 483
 484 void
 485 mono_threadpool_cleanup (void)
 486 {
 487 #ifndef DISABLE_SOCKETS
 488         mono_threadpool_io_cleanup ();
 489 #endif
 490         mono_lazy_cleanup (&status, cleanup);
 491 }
 492
 493 MonoAsyncResult *
 494 mono_threadpool_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
 495 {
 496         static MonoClass *async_call_klass = NULL;
 497         MonoMethodMessage *message;
 498         MonoAsyncResult *async_result;
 499         MonoAsyncCall *async_call;
 500         MonoDelegate *async_callback = NULL;
 501         MonoObject *state = NULL;
 502
 503         if (!async_call_klass)
 504                 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
 505
 506         mono_lazy_initialize (&status, initialize);
 507
 508         mono_error_init (error);
 509
 510         message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
 511         return_val_if_nok (error, NULL);
 512
 513         async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
 514         return_val_if_nok (error, NULL);
 515
 516         MONO_OBJECT_SETREF (async_call, msg, message);
 517         MONO_OBJECT_SETREF (async_call, state, state);
 518
 519         if (async_callback) {
 520                 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
 521                 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
 522         }
 523
 524         async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
 525         return_val_if_nok (error, NULL);
 526         MONO_OBJECT_SETREF (async_result, async_delegate, target);
 527
 528         mono_threadpool_enqueue_work_item (domain, (MonoObject*) async_result, error);
 529         return_val_if_nok (error, NULL);
 530
 531         return async_result;
 532 }
 533
 534 MonoObject *
 535 mono_threadpool_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
 536 {
 537         MonoAsyncCall *ac;
 538
 539         mono_error_init (error);
 540         g_assert (exc);
 541         g_assert (out_args);
 542
 543         *exc = NULL;
 544         *out_args = NULL;
 545
 546         /* check if already finished */
 547         mono_monitor_enter ((MonoObject*) ares);
 548
 549         if (ares->endinvoke_called) {
 550                 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
 551                 mono_monitor_exit ((MonoObject*) ares);
 552                 return NULL;
 553         }
 554
 555         ares->endinvoke_called = 1;
 556
 557         /* wait until we are really finished */
 558         if (ares->completed) {
 559                 mono_monitor_exit ((MonoObject *) ares);
 560         } else {
 561                 gpointer wait_event;
 562                 if (ares->handle) {
 563                         wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
 564                 } else {
 565                         wait_event = mono_w32event_create (TRUE, FALSE);
 566                         g_assert(wait_event);
 567                         MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
 568                         if (!is_ok (error)) {
 569                                 mono_w32event_close (wait_event);
 570                                 return NULL;
 571                         }
 572                         MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
 573                 }
 574                 mono_monitor_exit ((MonoObject*) ares);
 575                 MONO_ENTER_GC_SAFE;
 576 #ifdef HOST_WIN32
 577                 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
 578 #else
 579                 mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
 580 #endif
 581                 MONO_EXIT_GC_SAFE;
 582         }
 583
 584         ac = (MonoAsyncCall*) ares->object_data;
 585         g_assert (ac);
 586
 587         *exc = ac->msg->exc; /* FIXME: GC add write barrier */
 588         *out_args = ac->out_args;
 589         return ac->res;
 590 }
 591
 592 gboolean
 593 mono_threadpool_remove_domain_jobs (MonoDomain *domain, int timeout)
 594 {
 595         gint64 end;
 596         ThreadPoolDomain *tpdomain;
 597         gboolean ret;
 598
 599         g_assert (domain);
 600         g_assert (timeout >= -1);
 601
 602         g_assert (mono_domain_is_unloading (domain));
 603
 604         if (timeout != -1)
 605                 end = mono_msec_ticks () + timeout;
 606
 607 #ifndef DISABLE_SOCKETS
 608         mono_threadpool_io_remove_domain_jobs (domain);
 609         if (timeout != -1) {
 610                 if (mono_msec_ticks () > end)
 611                         return FALSE;
 612         }
 613 #endif
 614
 615         /*
 616          * Wait for all threads which execute jobs in the domain to exit.
 617          * The is_unloading () check in worker_request () ensures that
 618          * no new jobs are added after we enter the lock below.
 619          */
 620
 621         if (!mono_lazy_is_initialized (&status))
 622                 return TRUE;
 623
 624         mono_refcount_inc (threadpool);
 625
 626         domains_lock ();
 627
 628         tpdomain = tpdomain_get (domain, FALSE);
 629         if (!tpdomain) {
 630                 domains_unlock ();
 631                 mono_refcount_dec (threadpool);
 632                 return TRUE;
 633         }
 634
 635         ret = TRUE;
 636
 637         while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
 638                 if (timeout == -1) {
 639                         mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool->domains_lock);
 640                 } else {
 641                         gint64 now;
 642                         gint res;
 643
 644                         now = mono_msec_ticks();
 645                         if (now > end) {
 646                                 ret = FALSE;
 647                                 break;
 648                         }
 649
 650                         res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool->domains_lock, end - now);
 651                         if (res != 0) {
 652                                 ret = FALSE;
 653                                 break;
 654                         }
 655                 }
 656         }
 657
 658         /* Remove from the list the worker threads look at */
 659         tpdomain_remove (tpdomain);
 660
 661         domains_unlock ();
 662
 663         mono_coop_cond_destroy (&tpdomain->cleanup_cond);
 664         tpdomain_free (tpdomain);
 665
 666         mono_refcount_dec (threadpool);
 667
 668         return ret;
 669 }
 670
 671 void
 672 mono_threadpool_suspend (void)
 673 {
 674         if (threadpool)
 675                 mono_threadpool_worker_set_suspended (threadpool->worker, TRUE);
 676 }
 677
 678 void
 679 mono_threadpool_resume (void)
 680 {
 681         if (threadpool)
 682                 mono_threadpool_worker_set_suspended (threadpool->worker, FALSE);
 683 }
 684
 685 void
 686 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 687 {
 688         ThreadPoolCounter counter;
 689
 690         if (!worker_threads || !completion_port_threads)
 691                 return;
 692
 693         mono_lazy_initialize (&status, initialize);
 694
 695         counter = COUNTER_READ (threadpool);
 696
 697         *worker_threads = MAX (0, mono_threadpool_worker_get_max (threadpool->worker) - counter._.working);
 698         *completion_port_threads = threadpool->limit_io_max;
 699 }
 700
 701 void
 702 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 703 {
 704         if (!worker_threads || !completion_port_threads)
 705                 return;
 706
 707         mono_lazy_initialize (&status, initialize);
 708
 709         *worker_threads = mono_threadpool_worker_get_min (threadpool->worker);
 710         *completion_port_threads = threadpool->limit_io_min;
 711 }
 712
 713 void
 714 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 715 {
 716         if (!worker_threads || !completion_port_threads)
 717                 return;
 718
 719         mono_lazy_initialize (&status, initialize);
 720
 721         *worker_threads = mono_threadpool_worker_get_max (threadpool->worker);
 722         *completion_port_threads = threadpool->limit_io_max;
 723 }
 724
 725 MonoBoolean
 726 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 727 {
 728         mono_lazy_initialize (&status, initialize);
 729
 730         if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
 731                 return FALSE;
 732
 733         if (!mono_threadpool_worker_set_min (threadpool->worker, worker_threads))
 734                 return FALSE;
 735
 736         threadpool->limit_io_min = completion_port_threads;
 737
 738         return TRUE;
 739 }
 740
 741 MonoBoolean
 742 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 743 {
 744         gint cpu_count = mono_cpu_count ();
 745
 746         mono_lazy_initialize (&status, initialize);
 747
 748         if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
 749                 return FALSE;
 750
 751         if (!mono_threadpool_worker_set_max (threadpool->worker, worker_threads))
 752                 return FALSE;
 753
 754         threadpool->limit_io_max = completion_port_threads;
 755
 756         return TRUE;
 757 }
 758
 759 void
 760 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
 761 {
 762         if (enable_worker_tracking) {
 763                 // TODO implement some kind of switch to have the possibily to use it
 764                 *enable_worker_tracking = FALSE;
 765         }
 766
 767         mono_lazy_initialize (&status, initialize);
 768 }
 769
 770 MonoBoolean
 771 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
 772 {
 773         if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
 774                 return FALSE;
 775
 776         return mono_threadpool_worker_notify_completed (threadpool->worker);
 777 }
 778
 779 void
 780 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
 781 {
 782         mono_threadpool_worker_notify_completed (threadpool->worker);
 783 }
 784
 785 void
 786 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
 787 {
 788         // TODO
 789         MonoError error;
 790         mono_error_set_not_implemented (&error, "");
 791         mono_error_set_pending_exception (&error);
 792 }
 793
 794 MonoBoolean
 795 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
 796 {
 797         MonoDomain *domain;
 798         ThreadPoolDomain *tpdomain;
 799         ThreadPoolCounter counter;
 800
 801         domain = mono_domain_get ();
 802         if (mono_domain_is_unloading (domain))
 803                 return FALSE;
 804
 805         if (!mono_refcount_tryinc (threadpool)) {
 806                 /* threadpool has been destroyed, we are shutting down */
 807                 return FALSE;
 808         }
 809
 810         domains_lock ();
 811
 812         /* synchronize with mono_threadpool_remove_domain_jobs */
 813         if (mono_domain_is_unloading (domain)) {
 814                 domains_unlock ();
 815                 mono_refcount_dec (threadpool);
 816                 return FALSE;
 817         }
 818
 819         tpdomain = tpdomain_get (domain, TRUE);
 820         g_assert (tpdomain);
 821
 822         tpdomain->outstanding_request ++;
 823         g_assert (tpdomain->outstanding_request >= 1);
 824
 825         domains_unlock ();
 826
 827         COUNTER_ATOMIC (threadpool, counter, {
 828                 if (counter._.starting == 16) {
 829                         mono_refcount_dec (threadpool);
 830                         return TRUE;
 831                 }
 832
 833                 counter._.starting ++;
 834         });
 835
 836         mono_threadpool_worker_enqueue (threadpool->worker, worker_callback, NULL);
 837
 838         return TRUE;
 839 }
 840
 841 MonoBoolean G_GNUC_UNUSED
 842 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
 843 {
 844         /* This copy the behavior of the current Mono implementation */
 845         MonoError error;
 846         mono_error_set_not_implemented (&error, "");
 847         mono_error_set_pending_exception (&error);
 848         return FALSE;
 849 }
 850
 851 MonoBoolean G_GNUC_UNUSED
 852 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
 853 {
 854         /* This copy the behavior of the current Mono implementation */
 855         return TRUE;
 856 }
 857
 858 MonoBoolean G_GNUC_UNUSED
 859 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)
 860 {
 861         return FALSE;
 862 }