mono/metadata/threadpool.c

   1 /**
   2  * \file
   3  * Microsoft threadpool runtime support
   4  *
   5  * Author:
   6  *      Ludovic Henry (ludovic.henry@xamarin.com)
   7  *
   8  * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
   9  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  10  */
  11
  12 //
  13 // Copyright (c) Microsoft. All rights reserved.
  14 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
  15 //
  16 // Files:
  17 //  - src/vm/comthreadpool.cpp
  18 //  - src/vm/win32threadpoolcpp
  19 //  - src/vm/threadpoolrequest.cpp
  20 //  - src/vm/hillclimbing.cpp
  21 //
  22 // Ported from C++ to C and adjusted to Mono runtime
  23
  24 #include <stdlib.h>
  25 #define _USE_MATH_DEFINES // needed by MSVC to define math constants
  26 #include <math.h>
  27 #include <config.h>
  28 #include <glib.h>
  29
  30 #include <mono/metadata/class-internals.h>
  31 #include <mono/metadata/exception.h>
  32 #include <mono/metadata/gc-internals.h>
  33 #include <mono/metadata/object.h>
  34 #include <mono/metadata/object-internals.h>
  35 #include <mono/metadata/threadpool.h>
  36 #include <mono/metadata/threadpool-worker.h>
  37 #include <mono/metadata/threadpool-io.h>
  38 #include <mono/metadata/w32event.h>
  39 #include <mono/utils/atomic.h>
  40 #include <mono/utils/mono-compiler.h>
  41 #include <mono/utils/mono-complex.h>
  42 #include <mono/utils/mono-lazy-init.h>
  43 #include <mono/utils/mono-logger.h>
  44 #include <mono/utils/mono-logger-internals.h>
  45 #include <mono/utils/mono-proclib.h>
  46 #include <mono/utils/mono-threads.h>
  47 #include <mono/utils/mono-time.h>
  48 #include <mono/utils/refcount.h>
  49 #include <mono/utils/mono-os-wait.h>
  50 #include "monitor.h"
  51 #include "icall-decl.h"
  52
  53 // consistency with coreclr https://github.com/dotnet/coreclr/blob/643b09f966e68e06d5f0930755985a01a2a2b096/src/vm/win32threadpool.h#L111
  54 #define MAX_POSSIBLE_THREADS 0x7fff
  55
  56 typedef struct {
  57         MonoDomain *domain;
  58         /* Number of outstanding jobs */
  59         gint32 outstanding_request;
  60         /* Number of currently executing jobs */
  61         gint32 threadpool_jobs;
  62         /* Signalled when threadpool_jobs + outstanding_request is 0 */
  63         /* Protected by threadpool.domains_lock */
  64         MonoCoopCond cleanup_cond;
  65 } ThreadPoolDomain;
  66
  67 typedef union {
  68         struct {
  69                 gint16 starting; /* starting, but not yet in worker_callback */
  70                 gint16 working; /* executing worker_callback */
  71         } _;
  72         gint32 as_gint32;
  73 } ThreadPoolCounter;
  74
  75 typedef struct {
  76         MonoRefCount ref;
  77
  78         GPtrArray *domains; // ThreadPoolDomain* []
  79         MonoCoopMutex domains_lock;
  80
  81         ThreadPoolCounter counters;
  82
  83         gint32 limit_io_min;
  84         gint32 limit_io_max;
  85 } ThreadPool;
  86
  87 static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
  88
  89 static ThreadPool threadpool;
  90
  91 #define COUNTER_ATOMIC(var,block) \
  92         do { \
  93                 ThreadPoolCounter __old; \
  94                 do { \
  95                         (var) = __old = COUNTER_READ (); \
  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 (mono_atomic_cas_i32 (&threadpool.counters.as_gint32, (var).as_gint32, __old.as_gint32) != __old.as_gint32); \
 102         } while (0)
 103
 104 static inline ThreadPoolCounter
 105 COUNTER_READ (void)
 106 {
 107         ThreadPoolCounter counter;
 108         counter.as_gint32 = mono_atomic_load_i32 (&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
 131 static void
 132 worker_callback (void);
 133
 134 static void
 135 initialize (void)
 136 {
 137         g_assert (sizeof (ThreadPoolCounter) == sizeof (gint32));
 138
 139         mono_refcount_init (&threadpool, destroy);
 140
 141         threadpool.domains = g_ptr_array_new ();
 142         mono_coop_mutex_init (&threadpool.domains_lock);
 143
 144         threadpool.limit_io_min = mono_cpu_count ();
 145         threadpool.limit_io_max = CLAMP (threadpool.limit_io_min * 100, MIN (threadpool.limit_io_min, 200), MAX (threadpool.limit_io_min, 200));
 146
 147         mono_threadpool_worker_init (worker_callback);
 148 }
 149
 150 static void
 151 cleanup (void)
 152 {
 153         mono_threadpool_worker_cleanup ();
 154
 155         mono_refcount_dec (&threadpool);
 156 }
 157
 158 gboolean
 159 mono_threadpool_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
 160 {
 161         static MonoClass *threadpool_class = NULL;
 162         static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
 163         MonoDomain *current_domain;
 164         MonoBoolean f;
 165         gpointer args [2];
 166
 167         error_init (error);
 168         g_assert (work_item);
 169
 170         if (!threadpool_class)
 171                 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
 172
 173         if (!unsafe_queue_custom_work_item_method) {
 174                 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name_checked (threadpool_class, "UnsafeQueueCustomWorkItem", 2, 0, error);
 175                 mono_error_assert_ok (error);
 176         }
 177         g_assert (unsafe_queue_custom_work_item_method);
 178
 179         f = FALSE;
 180
 181         args [0] = (gpointer) work_item;
 182         args [1] = (gpointer) &f;
 183
 184         current_domain = mono_domain_get ();
 185         if (current_domain == domain) {
 186                 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 187                 return_val_if_nok (error, FALSE);
 188         } else {
 189                 mono_thread_push_appdomain_ref (domain);
 190                 if (mono_domain_set (domain, FALSE)) {
 191                         mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 192                         if (!is_ok (error)) {
 193                                 mono_thread_pop_appdomain_ref ();
 194                                 return FALSE;
 195                         }
 196                         mono_domain_set (current_domain, TRUE);
 197                 }
 198                 mono_thread_pop_appdomain_ref ();
 199         }
 200         return TRUE;
 201 }
 202
 203 /* LOCKING: domains_lock must be held. */
 204 static ThreadPoolDomain *
 205 tpdomain_create (MonoDomain *domain)
 206 {
 207         ThreadPoolDomain *tpdomain;
 208
 209         tpdomain = g_new0 (ThreadPoolDomain, 1);
 210         tpdomain->domain = domain;
 211         mono_coop_cond_init (&tpdomain->cleanup_cond);
 212
 213         g_ptr_array_add (threadpool.domains, tpdomain);
 214
 215         return tpdomain;
 216 }
 217
 218 /* LOCKING: domains_lock must be held. */
 219 static gboolean
 220 tpdomain_remove (ThreadPoolDomain *tpdomain)
 221 {
 222         g_assert (tpdomain);
 223         return g_ptr_array_remove (threadpool.domains, tpdomain);
 224 }
 225
 226 /* LOCKING: domains_lock must be held */
 227 static ThreadPoolDomain *
 228 tpdomain_get (MonoDomain *domain)
 229 {
 230         gint i;
 231
 232         g_assert (domain);
 233
 234         for (i = 0; i < threadpool.domains->len; ++i) {
 235                 ThreadPoolDomain *tpdomain;
 236
 237                 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool.domains, i);
 238                 if (tpdomain->domain == domain)
 239                         return tpdomain;
 240         }
 241
 242         return NULL;
 243 }
 244
 245 static void
 246 tpdomain_free (ThreadPoolDomain *tpdomain)
 247 {
 248         g_free (tpdomain);
 249 }
 250
 251 /* LOCKING: domains_lock must be held */
 252 static ThreadPoolDomain *
 253 tpdomain_get_next (ThreadPoolDomain *current)
 254 {
 255         ThreadPoolDomain *tpdomain = NULL;
 256         gint len;
 257
 258         len = threadpool.domains->len;
 259         if (len > 0) {
 260                 gint i, current_idx = -1;
 261                 if (current) {
 262                         for (i = 0; i < len; ++i) {
 263                                 if (current == g_ptr_array_index (threadpool.domains, i)) {
 264                                         current_idx = i;
 265                                         break;
 266                                 }
 267                         }
 268                 }
 269                 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
 270                         ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool.domains, i % len);
 271                         if (tmp->outstanding_request > 0) {
 272                                 tpdomain = tmp;
 273                                 break;
 274                         }
 275                 }
 276         }
 277
 278         return tpdomain;
 279 }
 280
 281 static MonoObject*
 282 try_invoke_perform_wait_callback (MonoObject** exc, MonoError *error)
 283 {
 284         HANDLE_FUNCTION_ENTER ();
 285         error_init (error);
 286         MonoObject *res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, exc, error);
 287         HANDLE_FUNCTION_RETURN_VAL (res);
 288 }
 289
 290 static void
 291 worker_callback (void)
 292 {
 293         ERROR_DECL (error);
 294         ThreadPoolDomain *tpdomain, *previous_tpdomain;
 295         ThreadPoolCounter counter;
 296         MonoInternalThread *thread;
 297
 298         if (!mono_refcount_tryinc (&threadpool))
 299                 return;
 300
 301         thread = mono_thread_internal_current ();
 302
 303         COUNTER_ATOMIC (counter, {
 304                 if (!(counter._.working < 32767 /* G_MAXINT16 */))
 305                         g_error ("%s: counter._.working = %d, but should be < 32767", __func__, counter._.working);
 306
 307                 counter._.starting --;
 308                 counter._.working ++;
 309         });
 310
 311         if (mono_runtime_is_shutting_down ()) {
 312                 COUNTER_ATOMIC (counter, {
 313                         counter._.working --;
 314                 });
 315
 316                 mono_refcount_dec (&threadpool);
 317                 return;
 318         }
 319
 320         /*
 321          * This is needed so there is always an lmf frame in the runtime invoke call below,
 322          * so ThreadAbortExceptions are caught even if the thread is in native code.
 323          */
 324         mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
 325
 326         domains_lock ();
 327
 328         previous_tpdomain = NULL;
 329
 330         while (!mono_runtime_is_shutting_down ()) {
 331                 gboolean retire = FALSE;
 332
 333                 if (thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) {
 334                         domains_unlock ();
 335                         if (mono_thread_interruption_checkpoint_bool ()) {
 336                                 domains_lock ();
 337                                 continue;
 338                         }
 339                         domains_lock ();
 340                 }
 341
 342                 tpdomain = tpdomain_get_next (previous_tpdomain);
 343                 if (!tpdomain)
 344                         break;
 345
 346                 tpdomain->outstanding_request --;
 347                 g_assert (tpdomain->outstanding_request >= 0);
 348
 349                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d)",
 350                         GUINT_TO_POINTER (MONO_NATIVE_THREAD_ID_TO_UINT (mono_native_thread_id_get ())), tpdomain->domain, tpdomain->outstanding_request);
 351
 352                 g_assert (tpdomain->threadpool_jobs >= 0);
 353                 tpdomain->threadpool_jobs ++;
 354
 355                 domains_unlock ();
 356
 357                 MonoString *thread_name = mono_string_new_checked (mono_get_root_domain (), "Thread Pool Worker", error);
 358                 mono_error_assert_ok (error);
 359                 mono_thread_set_name_internal (thread, thread_name, FALSE, TRUE, error);
 360                 mono_error_assert_ok (error);
 361
 362                 mono_thread_clear_and_set_state (thread,
 363                         (MonoThreadState)~ThreadState_Background,
 364                         ThreadState_Background);
 365
 366                 mono_thread_push_appdomain_ref (tpdomain->domain);
 367                 if (mono_domain_set (tpdomain->domain, FALSE)) {
 368                         MonoObject *exc = NULL, *res;
 369
 370                         res = try_invoke_perform_wait_callback (&exc, error);
 371                         if (exc || !mono_error_ok(error)) {
 372                                 if (exc == NULL)
 373                                         exc = (MonoObject *) mono_error_convert_to_exception (error);
 374                                 else
 375                                         mono_error_cleanup (error);
 376                                 mono_thread_internal_unhandled_exception (exc);
 377                         } else if (res && *(MonoBoolean*) mono_object_unbox_internal (res) == FALSE) {
 378                                 retire = TRUE;
 379                         }
 380
 381                         mono_domain_set (mono_get_root_domain (), TRUE);
 382                 }
 383                 mono_thread_pop_appdomain_ref ();
 384
 385                 domains_lock ();
 386
 387                 tpdomain->threadpool_jobs --;
 388                 g_assert (tpdomain->threadpool_jobs >= 0);
 389
 390                 if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
 391                         gboolean removed;
 392
 393                         removed = tpdomain_remove (tpdomain);
 394                         g_assert (removed);
 395
 396                         mono_coop_cond_signal (&tpdomain->cleanup_cond);
 397                         tpdomain = NULL;
 398                 }
 399
 400                 if (retire)
 401                         break;
 402
 403                 previous_tpdomain = tpdomain;
 404         }
 405
 406         domains_unlock ();
 407
 408         COUNTER_ATOMIC (counter, {
 409                 counter._.working --;
 410         });
 411
 412         mono_refcount_dec (&threadpool);
 413 }
 414
 415 void
 416 mono_threadpool_cleanup (void)
 417 {
 418 #ifndef DISABLE_SOCKETS
 419         mono_threadpool_io_cleanup ();
 420 #endif
 421         mono_lazy_cleanup (&status, cleanup);
 422 }
 423
 424 MonoAsyncResult *
 425 mono_threadpool_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
 426 {
 427         static MonoClass *async_call_klass = NULL;
 428         MonoMethodMessage *message;
 429         MonoAsyncResult *async_result;
 430         MonoAsyncCall *async_call;
 431         MonoDelegate *async_callback = NULL;
 432         MonoObject *state = NULL;
 433
 434         if (!async_call_klass)
 435                 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
 436
 437         error_init (error);
 438
 439         message = mono_method_call_message_new (method, params, mono_get_delegate_invoke_internal (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
 440         return_val_if_nok (error, NULL);
 441
 442         async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
 443         return_val_if_nok (error, NULL);
 444
 445         MONO_OBJECT_SETREF_INTERNAL (async_call, msg, message);
 446         MONO_OBJECT_SETREF_INTERNAL (async_call, state, state);
 447
 448         if (async_callback) {
 449                 MONO_OBJECT_SETREF_INTERNAL (async_call, cb_method, mono_get_delegate_invoke_internal (((MonoObject*) async_callback)->vtable->klass));
 450                 MONO_OBJECT_SETREF_INTERNAL (async_call, cb_target, async_callback);
 451         }
 452
 453         async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
 454         return_val_if_nok (error, NULL);
 455         MONO_OBJECT_SETREF_INTERNAL (async_result, async_delegate, target);
 456
 457         mono_threadpool_enqueue_work_item (domain, (MonoObject*) async_result, error);
 458         return_val_if_nok (error, NULL);
 459
 460         return async_result;
 461 }
 462
 463 MonoObject *
 464 mono_threadpool_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
 465 {
 466         MonoAsyncCall *ac;
 467
 468         error_init (error);
 469         g_assert (exc);
 470         g_assert (out_args);
 471
 472         *exc = NULL;
 473         *out_args = NULL;
 474
 475         /* check if already finished */
 476         mono_monitor_enter_internal ((MonoObject*) ares);
 477
 478         if (ares->endinvoke_called) {
 479                 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
 480                 mono_monitor_exit_internal ((MonoObject*) ares);
 481                 return NULL;
 482         }
 483
 484         ares->endinvoke_called = 1;
 485
 486         /* wait until we are really finished */
 487         if (ares->completed) {
 488                 mono_monitor_exit_internal ((MonoObject *) ares);
 489         } else {
 490                 gpointer wait_event;
 491                 if (ares->handle) {
 492                         wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
 493                 } else {
 494                         wait_event = mono_w32event_create (TRUE, FALSE);
 495                         g_assert(wait_event);
 496                         MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
 497                         if (!is_ok (error)) {
 498                                 mono_w32event_close (wait_event);
 499                                 return NULL;
 500                         }
 501                         MONO_OBJECT_SETREF_INTERNAL (ares, handle, (MonoObject*) wait_handle);
 502                 }
 503                 mono_monitor_exit_internal ((MonoObject*) ares);
 504 #ifdef HOST_WIN32
 505                 MONO_ENTER_GC_SAFE;
 506                 mono_win32_wait_for_single_object_ex (wait_event, INFINITE, TRUE);
 507                 MONO_EXIT_GC_SAFE;
 508 #else
 509                 mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
 510 #endif
 511         }
 512
 513         ac = (MonoAsyncCall*) ares->object_data;
 514         g_assert (ac);
 515
 516         *exc = ac->msg->exc; /* FIXME: GC add write barrier */
 517         *out_args = ac->out_args;
 518         return ac->res;
 519 }
 520
 521 gboolean
 522 mono_threadpool_remove_domain_jobs (MonoDomain *domain, int timeout)
 523 {
 524         gint64 end;
 525         ThreadPoolDomain *tpdomain;
 526         gboolean ret;
 527
 528         g_assert (domain);
 529         g_assert (timeout >= -1);
 530
 531         g_assert (mono_domain_is_unloading (domain));
 532
 533         if (timeout != -1)
 534                 end = mono_msec_ticks () + timeout;
 535
 536 #ifndef DISABLE_SOCKETS
 537         mono_threadpool_io_remove_domain_jobs (domain);
 538         if (timeout != -1) {
 539                 if (mono_msec_ticks () > end)
 540                         return FALSE;
 541         }
 542 #endif
 543
 544         /*
 545          * Wait for all threads which execute jobs in the domain to exit.
 546          * The is_unloading () check in worker_request () ensures that
 547          * no new jobs are added after we enter the lock below.
 548          */
 549
 550         if (!mono_lazy_is_initialized (&status))
 551                 return TRUE;
 552
 553         mono_refcount_inc (&threadpool);
 554
 555         domains_lock ();
 556
 557         tpdomain = tpdomain_get (domain);
 558         if (!tpdomain) {
 559                 domains_unlock ();
 560                 mono_refcount_dec (&threadpool);
 561                 return TRUE;
 562         }
 563
 564         ret = TRUE;
 565
 566         while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
 567                 if (timeout == -1) {
 568                         mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool.domains_lock);
 569                 } else {
 570                         gint64 now;
 571                         gint res;
 572
 573                         now = mono_msec_ticks();
 574                         if (now > end) {
 575                                 ret = FALSE;
 576                                 break;
 577                         }
 578
 579                         res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool.domains_lock, end - now);
 580                         if (res != 0) {
 581                                 ret = FALSE;
 582                                 break;
 583                         }
 584                 }
 585         }
 586
 587         /* Remove from the list the worker threads look at */
 588         tpdomain_remove (tpdomain);
 589
 590         domains_unlock ();
 591
 592         mono_coop_cond_destroy (&tpdomain->cleanup_cond);
 593         tpdomain_free (tpdomain);
 594
 595         mono_refcount_dec (&threadpool);
 596
 597         return ret;
 598 }
 599
 600 void
 601 mono_threadpool_suspend (void)
 602 {
 603         if (mono_lazy_is_initialized (&status))
 604                 mono_threadpool_worker_set_suspended (TRUE);
 605 }
 606
 607 void
 608 mono_threadpool_resume (void)
 609 {
 610         if (mono_lazy_is_initialized (&status))
 611                 mono_threadpool_worker_set_suspended (FALSE);
 612 }
 613
 614 void
 615 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads, MonoError *error)
 616 {
 617         ThreadPoolCounter counter;
 618
 619         if (!worker_threads || !completion_port_threads)
 620                 return;
 621
 622         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 623                 *worker_threads = 0;
 624                 *completion_port_threads = 0;
 625                 return;
 626         }
 627
 628         counter = COUNTER_READ ();
 629
 630         *worker_threads = MAX (0, mono_threadpool_worker_get_max () - counter._.working);
 631         *completion_port_threads = threadpool.limit_io_max;
 632
 633         mono_refcount_dec (&threadpool);
 634 }
 635
 636 void
 637 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads, MonoError *error)
 638 {
 639         if (!worker_threads || !completion_port_threads)
 640                 return;
 641
 642         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 643                 *worker_threads = 0;
 644                 *completion_port_threads = 0;
 645                 return;
 646         }
 647
 648         *worker_threads = mono_threadpool_worker_get_min ();
 649         *completion_port_threads = threadpool.limit_io_min;
 650
 651         mono_refcount_dec (&threadpool);
 652 }
 653
 654 void
 655 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads, MonoError *error)
 656 {
 657         if (!worker_threads || !completion_port_threads)
 658                 return;
 659
 660         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 661                 *worker_threads = 0;
 662                 *completion_port_threads = 0;
 663                 return;
 664         }
 665
 666         *worker_threads = mono_threadpool_worker_get_max ();
 667         *completion_port_threads = threadpool.limit_io_max;
 668
 669         mono_refcount_dec (&threadpool);
 670 }
 671
 672 MonoBoolean
 673 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads, MonoError *error)
 674 {
 675         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool))
 676                 return FALSE;
 677
 678         if (completion_port_threads <= 0 || completion_port_threads > threadpool.limit_io_max)
 679                 return FALSE;
 680
 681         if (!mono_threadpool_worker_set_min (worker_threads)) {
 682                 mono_refcount_dec (&threadpool);
 683                 return FALSE;
 684         }
 685
 686         threadpool.limit_io_min = completion_port_threads;
 687
 688         mono_refcount_dec (&threadpool);
 689         return TRUE;
 690 }
 691
 692 MonoBoolean
 693 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads, MonoError *error)
 694 {
 695         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool))
 696                 return FALSE;
 697
 698         worker_threads = MIN (worker_threads, MAX_POSSIBLE_THREADS);
 699         completion_port_threads = MIN (completion_port_threads, MAX_POSSIBLE_THREADS);
 700
 701         gint cpu_count = mono_cpu_count ();
 702
 703         if (completion_port_threads < threadpool.limit_io_min || completion_port_threads < cpu_count)
 704                 return FALSE;
 705
 706         if (!mono_threadpool_worker_set_max (worker_threads)) {
 707                 mono_refcount_dec (&threadpool);
 708                 return FALSE;
 709         }
 710
 711         threadpool.limit_io_max = completion_port_threads;
 712
 713         mono_refcount_dec (&threadpool);
 714         return TRUE;
 715 }
 716
 717 void
 718 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking, MonoError *error)
 719 {
 720         if (enable_worker_tracking) {
 721                 // TODO implement some kind of switch to have the possibily to use it
 722                 *enable_worker_tracking = FALSE;
 723         }
 724
 725         mono_lazy_initialize (&status, initialize);
 726 }
 727
 728 MonoBoolean
 729 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (MonoError *error)
 730 {
 731         if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
 732                 return FALSE;
 733
 734         return mono_threadpool_worker_notify_completed ();
 735 }
 736
 737 void
 738 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (MonoError *error)
 739 {
 740         mono_threadpool_worker_notify_completed ();
 741 }
 742
 743 void
 744 ves_icall_System_Threading_ThreadPool_NotifyWorkItemQueued (MonoError *error)
 745 // FIXME Move to managed.
 746 {
 747 #ifndef DISABLE_PERFCOUNTERS
 748         mono_atomic_inc_i64 (&mono_perfcounters->threadpool_workitems);
 749 #endif
 750 }
 751
 752 void
 753 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working, MonoError *error)
 754 {
 755         // TODO
 756         mono_error_set_not_implemented (error, "");
 757 }
 758
 759 MonoBoolean
 760 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (MonoError *error)
 761 {
 762         MonoDomain *domain;
 763         ThreadPoolDomain *tpdomain;
 764         ThreadPoolCounter counter;
 765
 766         domain = mono_domain_get ();
 767         if (mono_domain_is_unloading (domain))
 768                 return FALSE;
 769
 770         if (!mono_lazy_initialize (&status, initialize) || !mono_refcount_tryinc (&threadpool)) {
 771                 /* threadpool has been destroyed, we are shutting down */
 772                 return FALSE;
 773         }
 774
 775         domains_lock ();
 776
 777         tpdomain = tpdomain_get (domain);
 778         if (!tpdomain) {
 779                 /* synchronize with mono_threadpool_remove_domain_jobs */
 780                 if (mono_domain_is_unloading (domain)) {
 781                         domains_unlock ();
 782                         mono_refcount_dec (&threadpool);
 783                         return FALSE;
 784                 }
 785
 786                 tpdomain = tpdomain_create (domain);
 787         }
 788
 789         g_assert (tpdomain);
 790
 791         tpdomain->outstanding_request ++;
 792         g_assert (tpdomain->outstanding_request >= 1);
 793
 794         domains_unlock ();
 795
 796         COUNTER_ATOMIC (counter, {
 797                 if (counter._.starting == 16) {
 798                         mono_refcount_dec (&threadpool);
 799                         return TRUE;
 800                 }
 801
 802                 counter._.starting ++;
 803         });
 804
 805         mono_threadpool_worker_request ();
 806
 807         mono_refcount_dec (&threadpool);
 808         return TRUE;
 809 }
 810
 811 MonoBoolean G_GNUC_UNUSED
 812 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped, MonoError *error)
 813 {
 814         /* This copy the behavior of the current Mono implementation */
 815         mono_error_set_not_implemented (error, "");
 816         return FALSE;
 817 }
 818
 819 MonoBoolean G_GNUC_UNUSED
 820 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle, MonoError *error)
 821 {
 822         /* This copy the behavior of the current Mono implementation */
 823         return TRUE;
 824 }
 825
 826 MonoBoolean G_GNUC_UNUSED
 827 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (MonoError *error)
 828 {
 829         return FALSE;
 830 }