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         g_free (threadpool);
 135 }
 136
 137 static void
 138 initialize (void)
 139 {
 140         g_assert (!threadpool);
 141         threadpool = g_new0 (ThreadPool, 1);
 142         g_assert (threadpool);
 143
 144         g_assert (sizeof (ThreadPoolCounter) == sizeof (gint32));
 145
 146         mono_refcount_init (threadpool, destroy);
 147
 148         threadpool->domains = g_ptr_array_new ();
 149         mono_coop_mutex_init (&threadpool->domains_lock);
 150
 151         threadpool->threads = g_ptr_array_new ();
 152         mono_coop_mutex_init (&threadpool->threads_lock);
 153         mono_coop_cond_init (&threadpool->threads_exit_cond);
 154
 155         threadpool->limit_io_min = mono_cpu_count ();
 156         threadpool->limit_io_max = CLAMP (threadpool->limit_io_min * 100, MIN (threadpool->limit_io_min, 200), MAX (threadpool->limit_io_min, 200));
 157
 158         mono_threadpool_worker_init (&threadpool->worker);
 159 }
 160
 161 static void
 162 cleanup (void)
 163 {
 164         guint i;
 165         MonoInternalThread *current;
 166
 167         /* we make the assumption along the code that we are
 168          * cleaning up only if the runtime is shutting down */
 169         g_assert (mono_runtime_is_shutting_down ());
 170
 171         current = mono_thread_internal_current ();
 172
 173         mono_coop_mutex_lock (&threadpool->threads_lock);
 174
 175         /* stop all threadpool->threads */
 176         for (i = 0; i < threadpool->threads->len; ++i) {
 177                 MonoInternalThread *thread = (MonoInternalThread*) g_ptr_array_index (threadpool->threads, i);
 178                 if (thread != current)
 179                         mono_thread_internal_abort (thread);
 180         }
 181
 182         mono_coop_mutex_unlock (&threadpool->threads_lock);
 183
 184         /* give a chance to the other threads to exit */
 185         mono_thread_info_yield ();
 186
 187         mono_coop_mutex_lock (&threadpool->threads_lock);
 188
 189         for (;;) {
 190                 if (threadpool->threads->len == 0)
 191                         break;
 192
 193                 if (threadpool->threads->len == 1 && g_ptr_array_index (threadpool->threads, 0) == current) {
 194                         /* We are waiting on ourselves */
 195                         break;
 196                 }
 197
 198                 mono_coop_cond_wait (&threadpool->threads_exit_cond, &threadpool->threads_lock);
 199         }
 200
 201         mono_coop_mutex_unlock (&threadpool->threads_lock);
 202
 203         mono_threadpool_worker_cleanup (threadpool->worker);
 204
 205         mono_refcount_dec (threadpool);
 206 }
 207
 208 gboolean
 209 mono_threadpool_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
 210 {
 211         static MonoClass *threadpool_class = NULL;
 212         static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
 213         MonoDomain *current_domain;
 214         MonoBoolean f;
 215         gpointer args [2];
 216
 217         mono_error_init (error);
 218         g_assert (work_item);
 219
 220         if (!threadpool_class)
 221                 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
 222
 223         if (!unsafe_queue_custom_work_item_method)
 224                 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
 225         g_assert (unsafe_queue_custom_work_item_method);
 226
 227         f = FALSE;
 228
 229         args [0] = (gpointer) work_item;
 230         args [1] = (gpointer) &f;
 231
 232         current_domain = mono_domain_get ();
 233         if (current_domain == domain) {
 234                 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 235                 return_val_if_nok (error, FALSE);
 236         } else {
 237                 mono_thread_push_appdomain_ref (domain);
 238                 if (mono_domain_set (domain, FALSE)) {
 239                         mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 240                         if (!is_ok (error)) {
 241                                 mono_thread_pop_appdomain_ref ();
 242                                 return FALSE;
 243                         }
 244                         mono_domain_set (current_domain, TRUE);
 245                 }
 246                 mono_thread_pop_appdomain_ref ();
 247         }
 248         return TRUE;
 249 }
 250
 251 /* LOCKING: domains_lock must be held */
 252 static void
 253 tpdomain_add (ThreadPoolDomain *tpdomain)
 254 {
 255         guint i, len;
 256
 257         g_assert (tpdomain);
 258
 259         len = threadpool->domains->len;
 260         for (i = 0; i < len; ++i) {
 261                 if (g_ptr_array_index (threadpool->domains, i) == tpdomain)
 262                         break;
 263         }
 264
 265         if (i == len)
 266                 g_ptr_array_add (threadpool->domains, tpdomain);
 267 }
 268
 269 /* LOCKING: domains_lock must be held. */
 270 static gboolean
 271 tpdomain_remove (ThreadPoolDomain *tpdomain)
 272 {
 273         g_assert (tpdomain);
 274         return g_ptr_array_remove (threadpool->domains, tpdomain);
 275 }
 276
 277 /* LOCKING: domains_lock must be held */
 278 static ThreadPoolDomain *
 279 tpdomain_get (MonoDomain *domain, gboolean create)
 280 {
 281         guint i;
 282         ThreadPoolDomain *tpdomain;
 283
 284         g_assert (domain);
 285
 286         for (i = 0; i < threadpool->domains->len; ++i) {
 287                 ThreadPoolDomain *tpdomain;
 288
 289                 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i);
 290                 if (tpdomain->domain == domain)
 291                         return tpdomain;
 292         }
 293
 294         if (!create)
 295                 return NULL;
 296
 297         tpdomain = g_new0 (ThreadPoolDomain, 1);
 298         tpdomain->domain = domain;
 299         mono_coop_cond_init (&tpdomain->cleanup_cond);
 300
 301         tpdomain_add (tpdomain);
 302
 303         return tpdomain;
 304 }
 305
 306 static void
 307 tpdomain_free (ThreadPoolDomain *tpdomain)
 308 {
 309         g_free (tpdomain);
 310 }
 311
 312 /* LOCKING: domains_lock must be held */
 313 static ThreadPoolDomain *
 314 tpdomain_get_next (ThreadPoolDomain *current)
 315 {
 316         ThreadPoolDomain *tpdomain = NULL;
 317         guint len;
 318
 319         len = threadpool->domains->len;
 320         if (len > 0) {
 321                 guint i, current_idx = -1;
 322                 if (current) {
 323                         for (i = 0; i < len; ++i) {
 324                                 if (current == g_ptr_array_index (threadpool->domains, i)) {
 325                                         current_idx = i;
 326                                         break;
 327                                 }
 328                         }
 329                         g_assert (current_idx != (guint)-1);
 330                 }
 331                 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
 332                         ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool->domains, i % len);
 333                         if (tmp->outstanding_request > 0) {
 334                                 tpdomain = tmp;
 335                                 break;
 336                         }
 337                 }
 338         }
 339
 340         return tpdomain;
 341 }
 342
 343 static void
 344 worker_callback (gpointer unused)
 345 {
 346         MonoError error;
 347         ThreadPoolDomain *tpdomain, *previous_tpdomain;
 348         ThreadPoolCounter counter;
 349         MonoInternalThread *thread;
 350
 351         thread = mono_thread_internal_current ();
 352
 353         COUNTER_ATOMIC (threadpool, counter, {
 354                 if (!(counter._.working < 32767 /* G_MAXINT16 */))
 355                         g_error ("%s: counter._.working = %d, but should be < 32767", __func__, counter._.working);
 356
 357                 counter._.starting --;
 358                 counter._.working ++;
 359         });
 360
 361         if (mono_runtime_is_shutting_down ()) {
 362                 COUNTER_ATOMIC (threadpool, counter, {
 363                         counter._.working --;
 364                 });
 365
 366                 mono_refcount_dec (threadpool);
 367                 return;
 368         }
 369
 370         mono_coop_mutex_lock (&threadpool->threads_lock);
 371         g_ptr_array_add (threadpool->threads, thread);
 372         mono_coop_mutex_unlock (&threadpool->threads_lock);
 373
 374         /*
 375          * This is needed so there is always an lmf frame in the runtime invoke call below,
 376          * so ThreadAbortExceptions are caught even if the thread is in native code.
 377          */
 378         mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
 379
 380         domains_lock ();
 381
 382         previous_tpdomain = NULL;
 383
 384         while (!mono_runtime_is_shutting_down ()) {
 385                 gboolean retire = FALSE;
 386
 387                 if ((thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) != 0) {
 388                         domains_unlock ();
 389                         mono_thread_interruption_checkpoint ();
 390                         domains_lock ();
 391                 }
 392
 393                 tpdomain = tpdomain_get_next (previous_tpdomain);
 394                 if (!tpdomain)
 395                         break;
 396
 397                 tpdomain->outstanding_request --;
 398                 g_assert (tpdomain->outstanding_request >= 0);
 399
 400                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d)",
 401                         mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
 402
 403                 g_assert (tpdomain->threadpool_jobs >= 0);
 404                 tpdomain->threadpool_jobs ++;
 405
 406                 domains_unlock ();
 407
 408                 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
 409                 if (!mono_thread_test_state (thread , ThreadState_Background))
 410                         ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
 411
 412                 mono_thread_push_appdomain_ref (tpdomain->domain);
 413                 if (mono_domain_set (tpdomain->domain, FALSE)) {
 414                         MonoObject *exc = NULL, *res;
 415
 416                         res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, &exc, &error);
 417                         if (exc || !mono_error_ok(&error)) {
 418                                 if (exc == NULL)
 419                                         exc = (MonoObject *) mono_error_convert_to_exception (&error);
 420                                 else
 421                                         mono_error_cleanup (&error);
 422                                 mono_thread_internal_unhandled_exception (exc);
 423                         } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE) {
 424                                 retire = TRUE;
 425                         }
 426
 427                         mono_domain_set (mono_get_root_domain (), TRUE);
 428                 }
 429                 mono_thread_pop_appdomain_ref ();
 430
 431                 domains_lock ();
 432
 433                 tpdomain->threadpool_jobs --;
 434                 g_assert (tpdomain->threadpool_jobs >= 0);
 435
 436                 if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
 437                         gboolean removed;
 438
 439                         removed = tpdomain_remove (tpdomain);
 440                         g_assert (removed);
 441
 442                         mono_coop_cond_signal (&tpdomain->cleanup_cond);
 443                         tpdomain = NULL;
 444                 }
 445
 446                 if (retire)
 447                         break;
 448
 449                 previous_tpdomain = tpdomain;
 450         }
 451
 452         domains_unlock ();
 453
 454         mono_coop_mutex_lock (&threadpool->threads_lock);
 455
 456         g_ptr_array_remove_fast (threadpool->threads, thread);
 457
 458         mono_coop_cond_signal (&threadpool->threads_exit_cond);
 459
 460         mono_coop_mutex_unlock (&threadpool->threads_lock);
 461
 462         COUNTER_ATOMIC (threadpool, counter, {
 463                 counter._.working --;
 464         });
 465
 466         mono_refcount_dec (threadpool);
 467 }
 468
 469 void
 470 mono_threadpool_cleanup (void)
 471 {
 472 #ifndef DISABLE_SOCKETS
 473         mono_threadpool_io_cleanup ();
 474 #endif
 475         mono_lazy_cleanup (&status, cleanup);
 476 }
 477
 478 MonoAsyncResult *
 479 mono_threadpool_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
 480 {
 481         static MonoClass *async_call_klass = NULL;
 482         MonoMethodMessage *message;
 483         MonoAsyncResult *async_result;
 484         MonoAsyncCall *async_call;
 485         MonoDelegate *async_callback = NULL;
 486         MonoObject *state = NULL;
 487
 488         if (!async_call_klass)
 489                 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
 490
 491         mono_lazy_initialize (&status, initialize);
 492
 493         mono_error_init (error);
 494
 495         message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
 496         return_val_if_nok (error, NULL);
 497
 498         async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
 499         return_val_if_nok (error, NULL);
 500
 501         MONO_OBJECT_SETREF (async_call, msg, message);
 502         MONO_OBJECT_SETREF (async_call, state, state);
 503
 504         if (async_callback) {
 505                 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
 506                 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
 507         }
 508
 509         async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
 510         return_val_if_nok (error, NULL);
 511         MONO_OBJECT_SETREF (async_result, async_delegate, target);
 512
 513         mono_threadpool_enqueue_work_item (domain, (MonoObject*) async_result, error);
 514         return_val_if_nok (error, NULL);
 515
 516         return async_result;
 517 }
 518
 519 MonoObject *
 520 mono_threadpool_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
 521 {
 522         MonoAsyncCall *ac;
 523
 524         mono_error_init (error);
 525         g_assert (exc);
 526         g_assert (out_args);
 527
 528         *exc = NULL;
 529         *out_args = NULL;
 530
 531         /* check if already finished */
 532         mono_monitor_enter ((MonoObject*) ares);
 533
 534         if (ares->endinvoke_called) {
 535                 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
 536                 mono_monitor_exit ((MonoObject*) ares);
 537                 return NULL;
 538         }
 539
 540         ares->endinvoke_called = 1;
 541
 542         /* wait until we are really finished */
 543         if (ares->completed) {
 544                 mono_monitor_exit ((MonoObject *) ares);
 545         } else {
 546                 gpointer wait_event;
 547                 if (ares->handle) {
 548                         wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
 549                 } else {
 550                         wait_event = mono_w32event_create (TRUE, FALSE);
 551                         g_assert(wait_event);
 552                         MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
 553                         if (!is_ok (error)) {
 554                                 CloseHandle (wait_event);
 555                                 return NULL;
 556                         }
 557                         MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
 558                 }
 559                 mono_monitor_exit ((MonoObject*) ares);
 560                 MONO_ENTER_GC_SAFE;
 561 #ifdef HOST_WIN32
 562                 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
 563 #else
 564                 mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
 565 #endif
 566                 MONO_EXIT_GC_SAFE;
 567         }
 568
 569         ac = (MonoAsyncCall*) ares->object_data;
 570         g_assert (ac);
 571
 572         *exc = ac->msg->exc; /* FIXME: GC add write barrier */
 573         *out_args = ac->out_args;
 574         return ac->res;
 575 }
 576
 577 gboolean
 578 mono_threadpool_remove_domain_jobs (MonoDomain *domain, int timeout)
 579 {
 580         gint64 end;
 581         ThreadPoolDomain *tpdomain;
 582         gboolean ret;
 583
 584         g_assert (domain);
 585         g_assert (timeout >= -1);
 586
 587         g_assert (mono_domain_is_unloading (domain));
 588
 589         if (timeout != -1)
 590                 end = mono_msec_ticks () + timeout;
 591
 592 #ifndef DISABLE_SOCKETS
 593         mono_threadpool_io_remove_domain_jobs (domain);
 594         if (timeout != -1) {
 595                 if (mono_msec_ticks () > end)
 596                         return FALSE;
 597         }
 598 #endif
 599
 600         /*
 601          * Wait for all threads which execute jobs in the domain to exit.
 602          * The is_unloading () check in worker_request () ensures that
 603          * no new jobs are added after we enter the lock below.
 604          */
 605
 606         if (!mono_lazy_is_initialized (&status))
 607                 return TRUE;
 608
 609         mono_refcount_inc (threadpool);
 610
 611         domains_lock ();
 612
 613         tpdomain = tpdomain_get (domain, FALSE);
 614         if (!tpdomain) {
 615                 domains_unlock ();
 616                 mono_refcount_dec (threadpool);
 617                 return TRUE;
 618         }
 619
 620         ret = TRUE;
 621
 622         while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
 623                 if (timeout == -1) {
 624                         mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool->domains_lock);
 625                 } else {
 626                         gint64 now;
 627                         gint res;
 628
 629                         now = mono_msec_ticks();
 630                         if (now > end) {
 631                                 ret = FALSE;
 632                                 break;
 633                         }
 634
 635                         res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool->domains_lock, end - now);
 636                         if (res != 0) {
 637                                 ret = FALSE;
 638                                 break;
 639                         }
 640                 }
 641         }
 642
 643         /* Remove from the list the worker threads look at */
 644         tpdomain_remove (tpdomain);
 645
 646         domains_unlock ();
 647
 648         mono_coop_cond_destroy (&tpdomain->cleanup_cond);
 649         tpdomain_free (tpdomain);
 650
 651         mono_refcount_dec (threadpool);
 652
 653         return ret;
 654 }
 655
 656 void
 657 mono_threadpool_suspend (void)
 658 {
 659         if (threadpool)
 660                 mono_threadpool_worker_set_suspended (threadpool->worker, TRUE);
 661 }
 662
 663 void
 664 mono_threadpool_resume (void)
 665 {
 666         if (threadpool)
 667                 mono_threadpool_worker_set_suspended (threadpool->worker, FALSE);
 668 }
 669
 670 void
 671 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 672 {
 673         ThreadPoolCounter counter;
 674
 675         if (!worker_threads || !completion_port_threads)
 676                 return;
 677
 678         mono_lazy_initialize (&status, initialize);
 679
 680         counter = COUNTER_READ (threadpool);
 681
 682         *worker_threads = MAX (0, mono_threadpool_worker_get_max (threadpool->worker) - counter._.working);
 683         *completion_port_threads = threadpool->limit_io_max;
 684 }
 685
 686 void
 687 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 688 {
 689         if (!worker_threads || !completion_port_threads)
 690                 return;
 691
 692         mono_lazy_initialize (&status, initialize);
 693
 694         *worker_threads = mono_threadpool_worker_get_min (threadpool->worker);
 695         *completion_port_threads = threadpool->limit_io_min;
 696 }
 697
 698 void
 699 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 700 {
 701         if (!worker_threads || !completion_port_threads)
 702                 return;
 703
 704         mono_lazy_initialize (&status, initialize);
 705
 706         *worker_threads = mono_threadpool_worker_get_max (threadpool->worker);
 707         *completion_port_threads = threadpool->limit_io_max;
 708 }
 709
 710 MonoBoolean
 711 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 712 {
 713         mono_lazy_initialize (&status, initialize);
 714
 715         if (completion_port_threads <= 0 || completion_port_threads > threadpool->limit_io_max)
 716                 return FALSE;
 717
 718         if (!mono_threadpool_worker_set_min (threadpool->worker, worker_threads))
 719                 return FALSE;
 720
 721         threadpool->limit_io_min = completion_port_threads;
 722
 723         return TRUE;
 724 }
 725
 726 MonoBoolean
 727 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 728 {
 729         gint cpu_count = mono_cpu_count ();
 730
 731         mono_lazy_initialize (&status, initialize);
 732
 733         if (completion_port_threads < threadpool->limit_io_min || completion_port_threads < cpu_count)
 734                 return FALSE;
 735
 736         if (!mono_threadpool_worker_set_max (threadpool->worker, worker_threads))
 737                 return FALSE;
 738
 739         threadpool->limit_io_max = completion_port_threads;
 740
 741         return TRUE;
 742 }
 743
 744 void
 745 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
 746 {
 747         if (enable_worker_tracking) {
 748                 // TODO implement some kind of switch to have the possibily to use it
 749                 *enable_worker_tracking = FALSE;
 750         }
 751
 752         mono_lazy_initialize (&status, initialize);
 753 }
 754
 755 MonoBoolean
 756 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
 757 {
 758         if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
 759                 return FALSE;
 760
 761         return mono_threadpool_worker_notify_completed (threadpool->worker);
 762 }
 763
 764 void
 765 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
 766 {
 767         mono_threadpool_worker_notify_completed (threadpool->worker);
 768 }
 769
 770 void
 771 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
 772 {
 773         // TODO
 774         MonoError error;
 775         mono_error_set_not_implemented (&error, "");
 776         mono_error_set_pending_exception (&error);
 777 }
 778
 779 MonoBoolean
 780 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
 781 {
 782         MonoDomain *domain;
 783         ThreadPoolDomain *tpdomain;
 784         ThreadPoolCounter counter;
 785
 786         domain = mono_domain_get ();
 787         if (mono_domain_is_unloading (domain))
 788                 return FALSE;
 789
 790         domains_lock ();
 791
 792         /* synchronize with mono_threadpool_remove_domain_jobs */
 793         if (mono_domain_is_unloading (domain)) {
 794                 domains_unlock ();
 795                 return FALSE;
 796         }
 797
 798         tpdomain = tpdomain_get (domain, TRUE);
 799         g_assert (tpdomain);
 800
 801         tpdomain->outstanding_request ++;
 802         g_assert (tpdomain->outstanding_request >= 1);
 803
 804         domains_unlock ();
 805
 806         COUNTER_ATOMIC (threadpool, counter, {
 807                 if (counter._.starting == 16)
 808                         return TRUE;
 809
 810                 counter._.starting ++;
 811         });
 812
 813         mono_refcount_inc (threadpool);
 814
 815         mono_threadpool_worker_enqueue (threadpool->worker, worker_callback, NULL);
 816
 817         return TRUE;
 818 }
 819
 820 MonoBoolean G_GNUC_UNUSED
 821 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
 822 {
 823         /* This copy the behavior of the current Mono implementation */
 824         MonoError error;
 825         mono_error_set_not_implemented (&error, "");
 826         mono_error_set_pending_exception (&error);
 827         return FALSE;
 828 }
 829
 830 MonoBoolean G_GNUC_UNUSED
 831 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
 832 {
 833         /* This copy the behavior of the current Mono implementation */
 834         return TRUE;
 835 }
 836
 837 MonoBoolean G_GNUC_UNUSED
 838 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)
 839 {
 840         return FALSE;
 841 }