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 } ThreadPool;
  83
  84 static mono_lazy_init_t status = MONO_LAZY_INIT_STATUS_NOT_INITIALIZED;
  85
  86 static ThreadPool threadpool;
  87
  88 #define COUNTER_ATOMIC(var,block) \
  89         do { \
  90                 ThreadPoolCounter __old; \
  91                 do { \
  92                         (var) = __old = COUNTER_READ (); \
  93                         { block; } \
  94                         if (!(counter._.starting >= 0)) \
  95                                 g_error ("%s: counter._.starting = %d, but should be >= 0", __func__, counter._.starting); \
  96                         if (!(counter._.working >= 0)) \
  97                                 g_error ("%s: counter._.working = %d, but should be >= 0", __func__, counter._.working); \
  98                 } while (InterlockedCompareExchange (&threadpool.counters.as_gint32, (var).as_gint32, __old.as_gint32) != __old.as_gint32); \
  99         } while (0)
 100
 101 static inline ThreadPoolCounter
 102 COUNTER_READ (void)
 103 {
 104         ThreadPoolCounter counter;
 105         counter.as_gint32 = InterlockedRead (&threadpool.counters.as_gint32);
 106         return counter;
 107 }
 108
 109 static inline void
 110 domains_lock (void)
 111 {
 112         mono_coop_mutex_lock (&threadpool.domains_lock);
 113 }
 114
 115 static inline void
 116 domains_unlock (void)
 117 {
 118         mono_coop_mutex_unlock (&threadpool.domains_lock);
 119 }
 120
 121 static void
 122 destroy (gpointer unused)
 123 {
 124 #if 0
 125         g_ptr_array_free (threadpool.domains, TRUE);
 126         mono_coop_mutex_destroy (&threadpool.domains_lock);
 127
 128         g_ptr_array_free (threadpool.threads, TRUE);
 129         mono_coop_mutex_destroy (&threadpool.threads_lock);
 130         mono_coop_cond_destroy (&threadpool.threads_exit_cond);
 131 #endif
 132 }
 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.threads = g_ptr_array_new ();
 145         mono_coop_mutex_init (&threadpool.threads_lock);
 146         mono_coop_cond_init (&threadpool.threads_exit_cond);
 147
 148         threadpool.limit_io_min = mono_cpu_count ();
 149         threadpool.limit_io_max = CLAMP (threadpool.limit_io_min * 100, MIN (threadpool.limit_io_min, 200), MAX (threadpool.limit_io_min, 200));
 150
 151         mono_threadpool_worker_init ();
 152 }
 153
 154 static void
 155 cleanup (void)
 156 {
 157         guint i;
 158         MonoInternalThread *current;
 159
 160         /* we make the assumption along the code that we are
 161          * cleaning up only if the runtime is shutting down */
 162         g_assert (mono_runtime_is_shutting_down ());
 163
 164         current = mono_thread_internal_current ();
 165
 166         mono_coop_mutex_lock (&threadpool.threads_lock);
 167
 168         /* stop all threadpool.threads */
 169         for (i = 0; i < threadpool.threads->len; ++i) {
 170                 MonoInternalThread *thread = (MonoInternalThread*) g_ptr_array_index (threadpool.threads, i);
 171                 if (thread != current)
 172                         mono_thread_internal_abort (thread);
 173         }
 174
 175         mono_coop_mutex_unlock (&threadpool.threads_lock);
 176
 177 #if 0
 178         /* give a chance to the other threads to exit */
 179         mono_thread_info_yield ();
 180
 181         mono_coop_mutex_lock (&threadpool.threads_lock);
 182
 183         for (;;) {
 184                 if (threadpool.threads->len == 0)
 185                         break;
 186
 187                 if (threadpool.threads->len == 1 && g_ptr_array_index (threadpool.threads, 0) == current) {
 188                         /* We are waiting on ourselves */
 189                         break;
 190                 }
 191
 192                 mono_coop_cond_wait (&threadpool.threads_exit_cond, &threadpool.threads_lock);
 193         }
 194
 195         mono_coop_mutex_unlock (&threadpool.threads_lock);
 196 #endif
 197
 198         mono_threadpool_worker_cleanup ();
 199
 200         mono_refcount_dec (&threadpool);
 201 }
 202
 203 gboolean
 204 mono_threadpool_enqueue_work_item (MonoDomain *domain, MonoObject *work_item, MonoError *error)
 205 {
 206         static MonoClass *threadpool_class = NULL;
 207         static MonoMethod *unsafe_queue_custom_work_item_method = NULL;
 208         MonoDomain *current_domain;
 209         MonoBoolean f;
 210         gpointer args [2];
 211
 212         mono_error_init (error);
 213         g_assert (work_item);
 214
 215         if (!threadpool_class)
 216                 threadpool_class = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "ThreadPool");
 217
 218         if (!unsafe_queue_custom_work_item_method)
 219                 unsafe_queue_custom_work_item_method = mono_class_get_method_from_name (threadpool_class, "UnsafeQueueCustomWorkItem", 2);
 220         g_assert (unsafe_queue_custom_work_item_method);
 221
 222         f = FALSE;
 223
 224         args [0] = (gpointer) work_item;
 225         args [1] = (gpointer) &f;
 226
 227         current_domain = mono_domain_get ();
 228         if (current_domain == domain) {
 229                 mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 230                 return_val_if_nok (error, FALSE);
 231         } else {
 232                 mono_thread_push_appdomain_ref (domain);
 233                 if (mono_domain_set (domain, FALSE)) {
 234                         mono_runtime_invoke_checked (unsafe_queue_custom_work_item_method, NULL, args, error);
 235                         if (!is_ok (error)) {
 236                                 mono_thread_pop_appdomain_ref ();
 237                                 return FALSE;
 238                         }
 239                         mono_domain_set (current_domain, TRUE);
 240                 }
 241                 mono_thread_pop_appdomain_ref ();
 242         }
 243         return TRUE;
 244 }
 245
 246 /* LOCKING: domains_lock must be held. */
 247 static ThreadPoolDomain *
 248 tpdomain_create (MonoDomain *domain)
 249 {
 250         ThreadPoolDomain *tpdomain;
 251
 252         tpdomain = g_new0 (ThreadPoolDomain, 1);
 253         tpdomain->domain = domain;
 254         mono_coop_cond_init (&tpdomain->cleanup_cond);
 255
 256         g_ptr_array_add (threadpool.domains, tpdomain);
 257
 258         return tpdomain;
 259 }
 260
 261 /* LOCKING: domains_lock must be held. */
 262 static gboolean
 263 tpdomain_remove (ThreadPoolDomain *tpdomain)
 264 {
 265         g_assert (tpdomain);
 266         return g_ptr_array_remove (threadpool.domains, tpdomain);
 267 }
 268
 269 /* LOCKING: domains_lock must be held */
 270 static ThreadPoolDomain *
 271 tpdomain_get (MonoDomain *domain)
 272 {
 273         gint i;
 274
 275         g_assert (domain);
 276
 277         for (i = 0; i < threadpool.domains->len; ++i) {
 278                 ThreadPoolDomain *tpdomain;
 279
 280                 tpdomain = (ThreadPoolDomain *)g_ptr_array_index (threadpool.domains, i);
 281                 if (tpdomain->domain == domain)
 282                         return tpdomain;
 283         }
 284
 285         return NULL;
 286 }
 287
 288 static void
 289 tpdomain_free (ThreadPoolDomain *tpdomain)
 290 {
 291         g_free (tpdomain);
 292 }
 293
 294 /* LOCKING: domains_lock must be held */
 295 static ThreadPoolDomain *
 296 tpdomain_get_next (ThreadPoolDomain *current)
 297 {
 298         ThreadPoolDomain *tpdomain = NULL;
 299         gint len;
 300
 301         len = threadpool.domains->len;
 302         if (len > 0) {
 303                 gint i, current_idx = -1;
 304                 if (current) {
 305                         for (i = 0; i < len; ++i) {
 306                                 if (current == g_ptr_array_index (threadpool.domains, i)) {
 307                                         current_idx = i;
 308                                         break;
 309                                 }
 310                         }
 311                 }
 312                 for (i = current_idx + 1; i < len + current_idx + 1; ++i) {
 313                         ThreadPoolDomain *tmp = (ThreadPoolDomain *)g_ptr_array_index (threadpool.domains, i % len);
 314                         if (tmp->outstanding_request > 0) {
 315                                 tpdomain = tmp;
 316                                 break;
 317                         }
 318                 }
 319         }
 320
 321         return tpdomain;
 322 }
 323
 324 static MonoObject*
 325 try_invoke_perform_wait_callback (MonoObject** exc, MonoError *error)
 326 {
 327         HANDLE_FUNCTION_ENTER ();
 328         mono_error_init (error);
 329         MonoObject *res = mono_runtime_try_invoke (mono_defaults.threadpool_perform_wait_callback_method, NULL, NULL, exc, error);
 330         HANDLE_FUNCTION_RETURN_VAL (res);
 331 }
 332
 333 static void
 334 worker_callback (gpointer unused)
 335 {
 336         MonoError error;
 337         ThreadPoolDomain *tpdomain, *previous_tpdomain;
 338         ThreadPoolCounter counter;
 339         MonoInternalThread *thread;
 340
 341         thread = mono_thread_internal_current ();
 342
 343         COUNTER_ATOMIC (counter, {
 344                 if (!(counter._.working < 32767 /* G_MAXINT16 */))
 345                         g_error ("%s: counter._.working = %d, but should be < 32767", __func__, counter._.working);
 346
 347                 counter._.starting --;
 348                 counter._.working ++;
 349         });
 350
 351         if (mono_runtime_is_shutting_down ()) {
 352                 COUNTER_ATOMIC (counter, {
 353                         counter._.working --;
 354                 });
 355
 356                 mono_refcount_dec (&threadpool);
 357                 return;
 358         }
 359
 360         mono_coop_mutex_lock (&threadpool.threads_lock);
 361         g_ptr_array_add (threadpool.threads, thread);
 362         mono_coop_mutex_unlock (&threadpool.threads_lock);
 363
 364         /*
 365          * This is needed so there is always an lmf frame in the runtime invoke call below,
 366          * so ThreadAbortExceptions are caught even if the thread is in native code.
 367          */
 368         mono_defaults.threadpool_perform_wait_callback_method->save_lmf = TRUE;
 369
 370         domains_lock ();
 371
 372         previous_tpdomain = NULL;
 373
 374         while (!mono_runtime_is_shutting_down ()) {
 375                 gboolean retire = FALSE;
 376
 377                 if (thread->state & (ThreadState_AbortRequested | ThreadState_SuspendRequested)) {
 378                         domains_unlock ();
 379                         if (mono_thread_interruption_checkpoint ()) {
 380                                 domains_lock ();
 381                                 continue;
 382                         }
 383                         domains_lock ();
 384                 }
 385
 386                 tpdomain = tpdomain_get_next (previous_tpdomain);
 387                 if (!tpdomain)
 388                         break;
 389
 390                 tpdomain->outstanding_request --;
 391                 g_assert (tpdomain->outstanding_request >= 0);
 392
 393                 mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_THREADPOOL, "[%p] worker running in domain %p (outstanding requests %d)",
 394                         mono_native_thread_id_get (), tpdomain->domain, tpdomain->outstanding_request);
 395
 396                 g_assert (tpdomain->threadpool_jobs >= 0);
 397                 tpdomain->threadpool_jobs ++;
 398
 399                 domains_unlock ();
 400
 401                 mono_thread_set_name_internal (thread, mono_string_new (mono_get_root_domain (), "Threadpool worker"), FALSE, TRUE, &error);
 402                 mono_error_assert_ok (&error);
 403
 404                 mono_thread_clr_state (thread, (MonoThreadState)~ThreadState_Background);
 405                 if (!mono_thread_test_state (thread , ThreadState_Background))
 406                         ves_icall_System_Threading_Thread_SetState (thread, ThreadState_Background);
 407
 408                 mono_thread_push_appdomain_ref (tpdomain->domain);
 409                 if (mono_domain_set (tpdomain->domain, FALSE)) {
 410                         MonoObject *exc = NULL, *res;
 411
 412                         res = try_invoke_perform_wait_callback (&exc, &error);
 413                         if (exc || !mono_error_ok(&error)) {
 414                                 if (exc == NULL)
 415                                         exc = (MonoObject *) mono_error_convert_to_exception (&error);
 416                                 else
 417                                         mono_error_cleanup (&error);
 418                                 mono_thread_internal_unhandled_exception (exc);
 419                         } else if (res && *(MonoBoolean*) mono_object_unbox (res) == FALSE) {
 420                                 retire = TRUE;
 421                         }
 422
 423                         mono_domain_set (mono_get_root_domain (), TRUE);
 424                 }
 425                 mono_thread_pop_appdomain_ref ();
 426
 427                 domains_lock ();
 428
 429                 tpdomain->threadpool_jobs --;
 430                 g_assert (tpdomain->threadpool_jobs >= 0);
 431
 432                 if (tpdomain->outstanding_request + tpdomain->threadpool_jobs == 0 && mono_domain_is_unloading (tpdomain->domain)) {
 433                         gboolean removed;
 434
 435                         removed = tpdomain_remove (tpdomain);
 436                         g_assert (removed);
 437
 438                         mono_coop_cond_signal (&tpdomain->cleanup_cond);
 439                         tpdomain = NULL;
 440                 }
 441
 442                 if (retire)
 443                         break;
 444
 445                 previous_tpdomain = tpdomain;
 446         }
 447
 448         domains_unlock ();
 449
 450         mono_coop_mutex_lock (&threadpool.threads_lock);
 451
 452         g_ptr_array_remove_fast (threadpool.threads, thread);
 453
 454         mono_coop_cond_signal (&threadpool.threads_exit_cond);
 455
 456         mono_coop_mutex_unlock (&threadpool.threads_lock);
 457
 458         COUNTER_ATOMIC (counter, {
 459                 counter._.working --;
 460         });
 461
 462         mono_refcount_dec (&threadpool);
 463 }
 464
 465 void
 466 mono_threadpool_cleanup (void)
 467 {
 468 #ifndef DISABLE_SOCKETS
 469         mono_threadpool_io_cleanup ();
 470 #endif
 471         mono_lazy_cleanup (&status, cleanup);
 472 }
 473
 474 MonoAsyncResult *
 475 mono_threadpool_begin_invoke (MonoDomain *domain, MonoObject *target, MonoMethod *method, gpointer *params, MonoError *error)
 476 {
 477         static MonoClass *async_call_klass = NULL;
 478         MonoMethodMessage *message;
 479         MonoAsyncResult *async_result;
 480         MonoAsyncCall *async_call;
 481         MonoDelegate *async_callback = NULL;
 482         MonoObject *state = NULL;
 483
 484         if (!async_call_klass)
 485                 async_call_klass = mono_class_load_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
 486
 487         mono_lazy_initialize (&status, initialize);
 488
 489         mono_error_init (error);
 490
 491         message = mono_method_call_message_new (method, params, mono_get_delegate_invoke (method->klass), (params != NULL) ? (&async_callback) : NULL, (params != NULL) ? (&state) : NULL, error);
 492         return_val_if_nok (error, NULL);
 493
 494         async_call = (MonoAsyncCall*) mono_object_new_checked (domain, async_call_klass, error);
 495         return_val_if_nok (error, NULL);
 496
 497         MONO_OBJECT_SETREF (async_call, msg, message);
 498         MONO_OBJECT_SETREF (async_call, state, state);
 499
 500         if (async_callback) {
 501                 MONO_OBJECT_SETREF (async_call, cb_method, mono_get_delegate_invoke (((MonoObject*) async_callback)->vtable->klass));
 502                 MONO_OBJECT_SETREF (async_call, cb_target, async_callback);
 503         }
 504
 505         async_result = mono_async_result_new (domain, NULL, async_call->state, NULL, (MonoObject*) async_call, error);
 506         return_val_if_nok (error, NULL);
 507         MONO_OBJECT_SETREF (async_result, async_delegate, target);
 508
 509         mono_threadpool_enqueue_work_item (domain, (MonoObject*) async_result, error);
 510         return_val_if_nok (error, NULL);
 511
 512         return async_result;
 513 }
 514
 515 MonoObject *
 516 mono_threadpool_end_invoke (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc, MonoError *error)
 517 {
 518         MonoAsyncCall *ac;
 519
 520         mono_error_init (error);
 521         g_assert (exc);
 522         g_assert (out_args);
 523
 524         *exc = NULL;
 525         *out_args = NULL;
 526
 527         /* check if already finished */
 528         mono_monitor_enter ((MonoObject*) ares);
 529
 530         if (ares->endinvoke_called) {
 531                 mono_error_set_invalid_operation(error, "Delegate EndInvoke method called more than once");
 532                 mono_monitor_exit ((MonoObject*) ares);
 533                 return NULL;
 534         }
 535
 536         ares->endinvoke_called = 1;
 537
 538         /* wait until we are really finished */
 539         if (ares->completed) {
 540                 mono_monitor_exit ((MonoObject *) ares);
 541         } else {
 542                 gpointer wait_event;
 543                 if (ares->handle) {
 544                         wait_event = mono_wait_handle_get_handle ((MonoWaitHandle*) ares->handle);
 545                 } else {
 546                         wait_event = mono_w32event_create (TRUE, FALSE);
 547                         g_assert(wait_event);
 548                         MonoWaitHandle *wait_handle = mono_wait_handle_new (mono_object_domain (ares), wait_event, error);
 549                         if (!is_ok (error)) {
 550                                 mono_w32event_close (wait_event);
 551                                 return NULL;
 552                         }
 553                         MONO_OBJECT_SETREF (ares, handle, (MonoObject*) wait_handle);
 554                 }
 555                 mono_monitor_exit ((MonoObject*) ares);
 556                 MONO_ENTER_GC_SAFE;
 557 #ifdef HOST_WIN32
 558                 WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
 559 #else
 560                 mono_w32handle_wait_one (wait_event, MONO_INFINITE_WAIT, TRUE);
 561 #endif
 562                 MONO_EXIT_GC_SAFE;
 563         }
 564
 565         ac = (MonoAsyncCall*) ares->object_data;
 566         g_assert (ac);
 567
 568         *exc = ac->msg->exc; /* FIXME: GC add write barrier */
 569         *out_args = ac->out_args;
 570         return ac->res;
 571 }
 572
 573 gboolean
 574 mono_threadpool_remove_domain_jobs (MonoDomain *domain, int timeout)
 575 {
 576         gint64 end;
 577         ThreadPoolDomain *tpdomain;
 578         gboolean ret;
 579
 580         g_assert (domain);
 581         g_assert (timeout >= -1);
 582
 583         g_assert (mono_domain_is_unloading (domain));
 584
 585         if (timeout != -1)
 586                 end = mono_msec_ticks () + timeout;
 587
 588 #ifndef DISABLE_SOCKETS
 589         mono_threadpool_io_remove_domain_jobs (domain);
 590         if (timeout != -1) {
 591                 if (mono_msec_ticks () > end)
 592                         return FALSE;
 593         }
 594 #endif
 595
 596         /*
 597          * Wait for all threads which execute jobs in the domain to exit.
 598          * The is_unloading () check in worker_request () ensures that
 599          * no new jobs are added after we enter the lock below.
 600          */
 601
 602         if (!mono_lazy_is_initialized (&status))
 603                 return TRUE;
 604
 605         mono_refcount_inc (&threadpool);
 606
 607         domains_lock ();
 608
 609         tpdomain = tpdomain_get (domain);
 610         if (!tpdomain) {
 611                 domains_unlock ();
 612                 mono_refcount_dec (&threadpool);
 613                 return TRUE;
 614         }
 615
 616         ret = TRUE;
 617
 618         while (tpdomain->outstanding_request + tpdomain->threadpool_jobs > 0) {
 619                 if (timeout == -1) {
 620                         mono_coop_cond_wait (&tpdomain->cleanup_cond, &threadpool.domains_lock);
 621                 } else {
 622                         gint64 now;
 623                         gint res;
 624
 625                         now = mono_msec_ticks();
 626                         if (now > end) {
 627                                 ret = FALSE;
 628                                 break;
 629                         }
 630
 631                         res = mono_coop_cond_timedwait (&tpdomain->cleanup_cond, &threadpool.domains_lock, end - now);
 632                         if (res != 0) {
 633                                 ret = FALSE;
 634                                 break;
 635                         }
 636                 }
 637         }
 638
 639         /* Remove from the list the worker threads look at */
 640         tpdomain_remove (tpdomain);
 641
 642         domains_unlock ();
 643
 644         mono_coop_cond_destroy (&tpdomain->cleanup_cond);
 645         tpdomain_free (tpdomain);
 646
 647         mono_refcount_dec (&threadpool);
 648
 649         return ret;
 650 }
 651
 652 void
 653 mono_threadpool_suspend (void)
 654 {
 655         if (mono_lazy_is_initialized (&status))
 656                 mono_threadpool_worker_set_suspended (TRUE);
 657 }
 658
 659 void
 660 mono_threadpool_resume (void)
 661 {
 662         if (mono_lazy_is_initialized (&status))
 663                 mono_threadpool_worker_set_suspended (FALSE);
 664 }
 665
 666 void
 667 ves_icall_System_Threading_ThreadPool_GetAvailableThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 668 {
 669         ThreadPoolCounter counter;
 670
 671         if (!worker_threads || !completion_port_threads)
 672                 return;
 673
 674         mono_lazy_initialize (&status, initialize);
 675
 676         counter = COUNTER_READ ();
 677
 678         *worker_threads = MAX (0, mono_threadpool_worker_get_max () - counter._.working);
 679         *completion_port_threads = threadpool.limit_io_max;
 680 }
 681
 682 void
 683 ves_icall_System_Threading_ThreadPool_GetMinThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 684 {
 685         if (!worker_threads || !completion_port_threads)
 686                 return;
 687
 688         mono_lazy_initialize (&status, initialize);
 689
 690         *worker_threads = mono_threadpool_worker_get_min ();
 691         *completion_port_threads = threadpool.limit_io_min;
 692 }
 693
 694 void
 695 ves_icall_System_Threading_ThreadPool_GetMaxThreadsNative (gint32 *worker_threads, gint32 *completion_port_threads)
 696 {
 697         if (!worker_threads || !completion_port_threads)
 698                 return;
 699
 700         mono_lazy_initialize (&status, initialize);
 701
 702         *worker_threads = mono_threadpool_worker_get_max ();
 703         *completion_port_threads = threadpool.limit_io_max;
 704 }
 705
 706 MonoBoolean
 707 ves_icall_System_Threading_ThreadPool_SetMinThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 708 {
 709         mono_lazy_initialize (&status, initialize);
 710
 711         if (completion_port_threads <= 0 || completion_port_threads > threadpool.limit_io_max)
 712                 return FALSE;
 713
 714         if (!mono_threadpool_worker_set_min (worker_threads))
 715                 return FALSE;
 716
 717         threadpool.limit_io_min = completion_port_threads;
 718
 719         return TRUE;
 720 }
 721
 722 MonoBoolean
 723 ves_icall_System_Threading_ThreadPool_SetMaxThreadsNative (gint32 worker_threads, gint32 completion_port_threads)
 724 {
 725         gint cpu_count = mono_cpu_count ();
 726
 727         mono_lazy_initialize (&status, initialize);
 728
 729         if (completion_port_threads < threadpool.limit_io_min || completion_port_threads < cpu_count)
 730                 return FALSE;
 731
 732         if (!mono_threadpool_worker_set_max (worker_threads))
 733                 return FALSE;
 734
 735         threadpool.limit_io_max = completion_port_threads;
 736
 737         return TRUE;
 738 }
 739
 740 void
 741 ves_icall_System_Threading_ThreadPool_InitializeVMTp (MonoBoolean *enable_worker_tracking)
 742 {
 743         if (enable_worker_tracking) {
 744                 // TODO implement some kind of switch to have the possibily to use it
 745                 *enable_worker_tracking = FALSE;
 746         }
 747
 748         mono_lazy_initialize (&status, initialize);
 749 }
 750
 751 MonoBoolean
 752 ves_icall_System_Threading_ThreadPool_NotifyWorkItemComplete (void)
 753 {
 754         if (mono_domain_is_unloading (mono_domain_get ()) || mono_runtime_is_shutting_down ())
 755                 return FALSE;
 756
 757         return mono_threadpool_worker_notify_completed ();
 758 }
 759
 760 void
 761 ves_icall_System_Threading_ThreadPool_NotifyWorkItemProgressNative (void)
 762 {
 763         mono_threadpool_worker_notify_completed ();
 764 }
 765
 766 void
 767 ves_icall_System_Threading_ThreadPool_ReportThreadStatus (MonoBoolean is_working)
 768 {
 769         // TODO
 770         MonoError error;
 771         mono_error_set_not_implemented (&error, "");
 772         mono_error_set_pending_exception (&error);
 773 }
 774
 775 MonoBoolean
 776 ves_icall_System_Threading_ThreadPool_RequestWorkerThread (void)
 777 {
 778         MonoDomain *domain;
 779         ThreadPoolDomain *tpdomain;
 780         ThreadPoolCounter counter;
 781
 782         domain = mono_domain_get ();
 783         if (mono_domain_is_unloading (domain))
 784                 return FALSE;
 785
 786         if (!mono_refcount_tryinc (&threadpool)) {
 787                 /* threadpool has been destroyed, we are shutting down */
 788                 return FALSE;
 789         }
 790
 791         domains_lock ();
 792
 793         tpdomain = tpdomain_get (domain);
 794         if (!tpdomain) {
 795                 /* synchronize with mono_threadpool_remove_domain_jobs */
 796                 if (mono_domain_is_unloading (domain)) {
 797                         domains_unlock ();
 798                         mono_refcount_dec (&threadpool);
 799                         return FALSE;
 800                 }
 801
 802                 tpdomain = tpdomain_create (domain);
 803         }
 804
 805         g_assert (tpdomain);
 806
 807         tpdomain->outstanding_request ++;
 808         g_assert (tpdomain->outstanding_request >= 1);
 809
 810         domains_unlock ();
 811
 812         COUNTER_ATOMIC (counter, {
 813                 if (counter._.starting == 16) {
 814                         mono_refcount_dec (&threadpool);
 815                         return TRUE;
 816                 }
 817
 818                 counter._.starting ++;
 819         });
 820
 821         mono_threadpool_worker_enqueue (worker_callback, NULL);
 822
 823         /* we do not decrement the threadpool refcount,
 824          * as it's going to be done in the worker_callback */
 825
 826         return TRUE;
 827 }
 828
 829 MonoBoolean G_GNUC_UNUSED
 830 ves_icall_System_Threading_ThreadPool_PostQueuedCompletionStatus (MonoNativeOverlapped *native_overlapped)
 831 {
 832         /* This copy the behavior of the current Mono implementation */
 833         MonoError error;
 834         mono_error_set_not_implemented (&error, "");
 835         mono_error_set_pending_exception (&error);
 836         return FALSE;
 837 }
 838
 839 MonoBoolean G_GNUC_UNUSED
 840 ves_icall_System_Threading_ThreadPool_BindIOCompletionCallbackNative (gpointer file_handle)
 841 {
 842         /* This copy the behavior of the current Mono implementation */
 843         return TRUE;
 844 }
 845
 846 MonoBoolean G_GNUC_UNUSED
 847 ves_icall_System_Threading_ThreadPool_IsThreadPoolHosted (void)
 848 {
 849         return FALSE;
 850 }