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