mono/utils/mono-threads.h

   1 /*
   2  * mono-threads.h: Low-level threading
   3  *
   4  * Author:
   5  *      Rodrigo Kumpera (kumpera@gmail.com)
   6  *
   7  * (C) 2011 Novell, Inc
   8  */
   9
  10 #ifndef __MONO_THREADS_H__
  11 #define __MONO_THREADS_H__
  12
  13 #include <mono/utils/mono-os-semaphore.h>
  14 #include <mono/utils/mono-stack-unwinding.h>
  15 #include <mono/utils/mono-linked-list-set.h>
  16 #include <mono/utils/mono-tls.h>
  17 #include <mono/utils/mono-coop-semaphore.h>
  18 #include <mono/utils/os-event.h>
  19 #include <mono/utils/refcount.h>
  20
  21 #include <glib.h>
  22 #include <config.h>
  23 #ifdef HOST_WIN32
  24
  25 #include <windows.h>
  26
  27 typedef DWORD MonoNativeThreadId;
  28 typedef HANDLE MonoNativeThreadHandle; /* unused */
  29
  30 typedef DWORD mono_native_thread_return_t;
  31 typedef DWORD mono_thread_start_return_t;
  32
  33 #define MONO_NATIVE_THREAD_ID_TO_UINT(tid) (tid)
  34 #define MONO_UINT_TO_NATIVE_THREAD_ID(tid) ((MonoNativeThreadId)(tid))
  35
  36 typedef LPTHREAD_START_ROUTINE MonoThreadStart;
  37
  38 #else
  39
  40 #include <pthread.h>
  41
  42 #if defined(__MACH__)
  43 #include <mono/utils/mach-support.h>
  44
  45 typedef thread_port_t MonoNativeThreadHandle;
  46
  47 #else
  48
  49 #include <unistd.h>
  50
  51 typedef pid_t MonoNativeThreadHandle;
  52
  53 #endif /* defined(__MACH__) */
  54
  55 typedef pthread_t MonoNativeThreadId;
  56
  57 typedef void* mono_native_thread_return_t;
  58 typedef gsize mono_thread_start_return_t;
  59
  60 #define MONO_NATIVE_THREAD_ID_TO_UINT(tid) (gsize)(tid)
  61 #define MONO_UINT_TO_NATIVE_THREAD_ID(tid) (MonoNativeThreadId)(gsize)(tid)
  62
  63 typedef gsize (*MonoThreadStart)(gpointer);
  64
  65 #endif /* #ifdef HOST_WIN32 */
  66
  67 #ifndef MONO_INFINITE_WAIT
  68 #define MONO_INFINITE_WAIT ((guint32) 0xFFFFFFFF)
  69 #endif
  70
  71 typedef struct {
  72         MonoRefCount ref;
  73         MonoOSEvent event;
  74 } MonoThreadHandle;
  75
  76 /*
  77 THREAD_INFO_TYPE is a way to make the mono-threads module parametric - or sort of.
  78 The GC using mono-threads might extend the MonoThreadInfo struct to add its own
  79 data, this avoid a pointer indirection on what is on a lot of hot paths.
  80
  81 But extending MonoThreadInfo has de disavantage that all functions here return type
  82 would require a cast, something like the following:
  83
  84 typedef struct {
  85         MonoThreadInfo info;
  86         int stuff;
  87 }  MyThreadInfo;
  88
  89 ...
  90 ((MyThreadInfo*)mono_thread_info_current ())->stuff = 1;
  91
  92 While porting sgen to use mono-threads, the number of casts required was too much and
  93 code ended up looking horrible. So we use this cute little hack. The idea is that
  94 whomever is including this header can set the expected type to be used by functions here
  95 and reduce the number of casts drastically.
  96
  97 */
  98 #ifndef THREAD_INFO_TYPE
  99 #define THREAD_INFO_TYPE MonoThreadInfo
 100 #endif
 101
 102 /* Mono Threads internal configuration knows*/
 103
 104 /* If this is defined, use the signals backed on Mach. Debug only as signals can't be made usable on OSX. */
 105 // #define USE_SIGNALS_ON_MACH
 106
 107 #if defined (_POSIX_VERSION) || defined (__native_client__)
 108 #if defined (__MACH__) && !defined (USE_SIGNALS_ON_MACH)
 109 #define USE_MACH_BACKEND
 110 #else
 111 #define USE_POSIX_BACKEND
 112 #endif
 113 #elif HOST_WIN32
 114 #define USE_WINDOWS_BACKEND
 115 #else
 116 #error "no backend support for current platform"
 117 #endif /* defined (_POSIX_VERSION) || defined (__native_client__) */
 118
 119 enum {
 120         STATE_STARTING                          = 0x00,
 121         STATE_RUNNING                           = 0x01,
 122         STATE_DETACHED                          = 0x02,
 123
 124         STATE_ASYNC_SUSPENDED                   = 0x03,
 125         STATE_SELF_SUSPENDED                    = 0x04,
 126         STATE_ASYNC_SUSPEND_REQUESTED   = 0x05,
 127         STATE_SELF_SUSPEND_REQUESTED    = 0x06,
 128         STATE_BLOCKING                                  = 0x07,
 129         STATE_BLOCKING_AND_SUSPENDED    = 0x8,
 130
 131         STATE_MAX                                               = 0x08,
 132
 133         THREAD_STATE_MASK                       = 0x00FF,
 134         THREAD_SUSPEND_COUNT_MASK       = 0xFF00,
 135         THREAD_SUSPEND_COUNT_SHIFT      = 8,
 136         THREAD_SUSPEND_COUNT_MAX        = 0xFF,
 137
 138         SELF_SUSPEND_STATE_INDEX = 0,
 139         ASYNC_SUSPEND_STATE_INDEX = 1,
 140 };
 141
 142 typedef struct _MonoThreadInfoInterruptToken MonoThreadInfoInterruptToken;
 143
 144 typedef struct {
 145         MonoLinkedListSetNode node;
 146         guint32 small_id; /*Used by hazard pointers */
 147         MonoNativeThreadHandle native_handle; /* Valid on mach and android */
 148         int thread_state;
 149
 150         /*Tells if this thread was created by the runtime or not.*/
 151         gboolean runtime_thread;
 152
 153         /* Tells if this thread should be ignored or not by runtime services such as GC and profiling */
 154         gboolean tools_thread;
 155
 156         /* Max stack bounds, all valid addresses must be between [stack_start_limit, stack_end[ */
 157         void *stack_start_limit, *stack_end;
 158
 159         /* suspend machinery, fields protected by suspend_semaphore */
 160         MonoSemType suspend_semaphore;
 161         int suspend_count;
 162
 163         MonoSemType resume_semaphore;
 164
 165         /* only needed by the posix backend */
 166 #if defined(USE_POSIX_BACKEND)
 167         MonoSemType finish_resume_semaphore;
 168         gboolean syscall_break_signal;
 169         int signal;
 170 #endif
 171
 172         gboolean suspend_can_continue;
 173
 174         /* This memory pool is used by coop GC to save stack data roots between GC unsafe regions */
 175         GByteArray *stackdata;
 176
 177         /*In theory, only the posix backend needs this, but having it on mach/win32 simplifies things a lot.*/
 178         MonoThreadUnwindState thread_saved_state [2]; //0 is self suspend, 1 is async suspend.
 179
 180         /*async call machinery, thread MUST be suspended before accessing those fields*/
 181         void (*async_target)(void*);
 182         void *user_data;
 183
 184         /*
 185         If true, this thread is running a critical region of code and cannot be suspended.
 186         A critical session is implicitly started when you call mono_thread_info_safe_suspend_sync
 187         and is ended when you call either mono_thread_info_resume or mono_thread_info_finish_suspend.
 188         */
 189         gboolean inside_critical_region;
 190
 191         /*
 192          * If TRUE, the thread is in async context. Code can use this information to avoid async-unsafe
 193          * operations like locking without having to pass an 'async' parameter around.
 194          */
 195         gboolean is_async_context;
 196
 197         /*
 198          * Values of TLS variables for this thread.
 199          * This can be used to obtain the values of TLS variable for threads
 200          * other than the current one.
 201          */
 202         gpointer tls [TLS_KEY_NUM];
 203
 204         /* IO layer handle for this thread */
 205         /* Set when the thread is started, or in _wapi_thread_duplicate () */
 206         MonoThreadHandle *handle;
 207
 208         void *jit_data;
 209
 210         MonoThreadInfoInterruptToken *interrupt_token;
 211
 212         /* HandleStack for coop handles */
 213         gpointer handle_stack;
 214
 215         /* Stack mark for targets that explicitly require one */
 216         gpointer stack_mark;
 217 } MonoThreadInfo;
 218
 219 typedef struct {
 220         void* (*thread_register)(THREAD_INFO_TYPE *info, void *baseaddr);
 221         /*
 222         This callback is called with @info still on the thread list.
 223         This call is made while holding the suspend lock, so don't do callbacks.
 224         SMR remains functional as its small_id has not been reclaimed.
 225         */
 226         void (*thread_unregister)(THREAD_INFO_TYPE *info);
 227         /*
 228         This callback is called right before thread_unregister. This is called
 229         without any locks held so it's the place for complicated cleanup.
 230
 231         The thread must remain operational between this call and thread_unregister.
 232         It must be possible to successfully suspend it after thread_unregister completes.
 233         */
 234         void (*thread_detach)(THREAD_INFO_TYPE *info);
 235         void (*thread_attach)(THREAD_INFO_TYPE *info);
 236         gboolean (*mono_method_is_critical) (void *method);
 237         gboolean (*ip_in_critical_region) (MonoDomain *domain, gpointer ip);
 238         gboolean (*mono_thread_in_critical_region) (THREAD_INFO_TYPE *info);
 239 } MonoThreadInfoCallbacks;
 240
 241 typedef struct {
 242         void (*setup_async_callback) (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data);
 243         gboolean (*thread_state_init_from_sigctx) (MonoThreadUnwindState *state, void *sigctx);
 244         gboolean (*thread_state_init_from_handle) (MonoThreadUnwindState *tctx, MonoThreadInfo *info);
 245         void (*thread_state_init) (MonoThreadUnwindState *tctx);
 246 } MonoThreadInfoRuntimeCallbacks;
 247
 248 //Not using 0 and 1 to ensure callbacks are not returning bad data
 249 typedef enum {
 250         MonoResumeThread = 0x1234,
 251         KeepSuspended = 0x4321,
 252 } SuspendThreadResult;
 253
 254 typedef SuspendThreadResult (*MonoSuspendThreadCallback) (THREAD_INFO_TYPE *info, gpointer user_data);
 255
 256 static inline gboolean
 257 mono_threads_filter_tools_threads (THREAD_INFO_TYPE *info)
 258 {
 259         return !((MonoThreadInfo*)info)->tools_thread;
 260 }
 261
 262 /*
 263 Requires the world to be stoped
 264 */
 265 #define FOREACH_THREAD(thread) \
 266         MONO_LLS_FOREACH_FILTERED (mono_thread_info_list_head (), THREAD_INFO_TYPE, thread, mono_threads_filter_tools_threads)
 267
 268 #define FOREACH_THREAD_END \
 269         MONO_LLS_FOREACH_END
 270
 271 /*
 272 Snapshot iteration.
 273 */
 274 #define FOREACH_THREAD_SAFE(thread) \
 275         MONO_LLS_FOREACH_FILTERED_SAFE (mono_thread_info_list_head (), THREAD_INFO_TYPE, thread, mono_threads_filter_tools_threads)
 276
 277 #define FOREACH_THREAD_SAFE_END \
 278         MONO_LLS_FOREACH_SAFE_END
 279
 280 static inline MonoNativeThreadId
 281 mono_thread_info_get_tid (THREAD_INFO_TYPE *info)
 282 {
 283         return MONO_UINT_TO_NATIVE_THREAD_ID (((MonoThreadInfo*) info)->node.key);
 284 }
 285
 286 static inline void
 287 mono_thread_info_set_tid (THREAD_INFO_TYPE *info, MonoNativeThreadId tid)
 288 {
 289         ((MonoThreadInfo*) info)->node.key = (uintptr_t) MONO_NATIVE_THREAD_ID_TO_UINT (tid);
 290 }
 291
 292 /*
 293  * @thread_info_size is sizeof (GcThreadInfo), a struct the GC defines to make it possible to have
 294  * a single block with info from both camps.
 295  */
 296 void
 297 mono_threads_init (MonoThreadInfoCallbacks *callbacks, size_t thread_info_size);
 298
 299 void
 300 mono_threads_signals_init (void);
 301
 302 void
 303 mono_threads_runtime_init (MonoThreadInfoRuntimeCallbacks *callbacks);
 304
 305 MonoThreadInfoRuntimeCallbacks *
 306 mono_threads_get_runtime_callbacks (void);
 307
 308 int
 309 mono_thread_info_register_small_id (void);
 310
 311 THREAD_INFO_TYPE *
 312 mono_thread_info_attach (void *baseptr);
 313
 314 MONO_API void
 315 mono_thread_info_detach (void);
 316
 317 gboolean
 318 mono_thread_info_is_exiting (void);
 319
 320 THREAD_INFO_TYPE *
 321 mono_thread_info_current (void);
 322
 323 THREAD_INFO_TYPE*
 324 mono_thread_info_current_unchecked (void);
 325
 326 int
 327 mono_thread_info_get_small_id (void);
 328
 329 MonoLinkedListSet*
 330 mono_thread_info_list_head (void);
 331
 332 THREAD_INFO_TYPE*
 333 mono_thread_info_lookup (MonoNativeThreadId id);
 334
 335 gboolean
 336 mono_thread_info_resume (MonoNativeThreadId tid);
 337
 338 void
 339 mono_thread_info_safe_suspend_and_run (MonoNativeThreadId id, gboolean interrupt_kernel, MonoSuspendThreadCallback callback, gpointer user_data);
 340
 341 void
 342 mono_thread_info_setup_async_call (THREAD_INFO_TYPE *info, void (*target_func)(void*), void *user_data);
 343
 344 void
 345 mono_thread_info_suspend_lock (void);
 346
 347 void
 348 mono_thread_info_suspend_unlock (void);
 349
 350 void
 351 mono_thread_info_abort_socket_syscall_for_close (MonoNativeThreadId tid);
 352
 353 void
 354 mono_thread_info_set_is_async_context (gboolean async_context);
 355
 356 gboolean
 357 mono_thread_info_is_async_context (void);
 358
 359 void
 360 mono_thread_info_get_stack_bounds (guint8 **staddr, size_t *stsize);
 361
 362 MONO_API gboolean
 363 mono_thread_info_yield (void);
 364
 365 gint
 366 mono_thread_info_sleep (guint32 ms, gboolean *alerted);
 367
 368 gint
 369 mono_thread_info_usleep (guint64 us);
 370
 371 gpointer
 372 mono_thread_info_tls_get (THREAD_INFO_TYPE *info, MonoTlsKey key);
 373
 374 void
 375 mono_thread_info_tls_set (THREAD_INFO_TYPE *info, MonoTlsKey key, gpointer value);
 376
 377 void
 378 mono_thread_info_exit (gsize exit_code);
 379
 380 void
 381 mono_thread_info_install_interrupt (void (*callback) (gpointer data), gpointer data, gboolean *interrupted);
 382
 383 void
 384 mono_thread_info_uninstall_interrupt (gboolean *interrupted);
 385
 386 MonoThreadInfoInterruptToken*
 387 mono_thread_info_prepare_interrupt (THREAD_INFO_TYPE *info);
 388
 389 void
 390 mono_thread_info_finish_interrupt (MonoThreadInfoInterruptToken *token);
 391
 392 void
 393 mono_thread_info_self_interrupt (void);
 394
 395 void
 396 mono_thread_info_clear_self_interrupt (void);
 397
 398 gboolean
 399 mono_thread_info_is_interrupt_state (THREAD_INFO_TYPE *info);
 400
 401 void
 402 mono_thread_info_describe_interrupt_token (THREAD_INFO_TYPE *info, GString *text);
 403
 404 gboolean
 405 mono_thread_info_is_live (THREAD_INFO_TYPE *info);
 406
 407 MonoThreadHandle*
 408 mono_threads_create_thread (MonoThreadStart start, gpointer arg, gsize * const stack_size, MonoNativeThreadId *out_tid);
 409
 410 int
 411 mono_threads_get_max_stack_size (void);
 412
 413 MonoThreadHandle*
 414 mono_threads_open_thread_handle (MonoThreadHandle *handle);
 415
 416 void
 417 mono_threads_close_thread_handle (MonoThreadHandle *handle);
 418
 419 MONO_API void
 420 mono_threads_attach_tools_thread (void);
 421
 422
 423 #if !defined(HOST_WIN32)
 424
 425 /*Use this instead of pthread_kill */
 426 int
 427 mono_threads_pthread_kill (THREAD_INFO_TYPE *info, int signum);
 428
 429 #endif /* !defined(HOST_WIN32) */
 430
 431 /* Internal API between mono-threads and its backends. */
 432
 433 /* Backend functions - a backend must implement all of the following */
 434 /*
 435 This is called very early in the runtime, it cannot access any runtime facilities.
 436
 437 */
 438 void mono_threads_suspend_init (void); //ok
 439
 440 void mono_threads_suspend_init_signals (void);
 441
 442 void mono_threads_coop_init (void);
 443
 444 /*
 445 This begins async suspend. This function must do the following:
 446
 447 -Ensure the target will EINTR any syscalls if @interrupt_kernel is true
 448 -Call mono_threads_transition_finish_async_suspend as part of its async suspend.
 449 -Register the thread for pending suspend with mono_threads_add_to_pending_operation_set if needed.
 450
 451 If begin suspend fails the thread must be left uninterrupted and resumed.
 452 */
 453 gboolean mono_threads_suspend_begin_async_suspend (THREAD_INFO_TYPE *info, gboolean interrupt_kernel);
 454
 455 /*
 456 This verifies the outcome of an async suspend operation.
 457
 458 Some targets, such as posix, verify suspend results assynchronously. Suspend results must be
 459 available (in a non blocking way) after mono_threads_wait_pending_operations completes.
 460 */
 461 gboolean mono_threads_suspend_check_suspend_result (THREAD_INFO_TYPE *info);
 462
 463 /*
 464 This begins async resume. This function must do the following:
 465
 466 - Install an async target if one was requested.
 467 - Notify the target to resume.
 468 - Register the thread for pending ack with mono_threads_add_to_pending_operation_set if needed.
 469 */
 470 gboolean mono_threads_suspend_begin_async_resume (THREAD_INFO_TYPE *info);
 471
 472 void mono_threads_suspend_register (THREAD_INFO_TYPE *info); //ok
 473 void mono_threads_suspend_free (THREAD_INFO_TYPE *info);
 474 void mono_threads_suspend_abort_syscall (THREAD_INFO_TYPE *info);
 475 gboolean mono_threads_suspend_needs_abort_syscall (void);
 476 gint mono_threads_suspend_search_alternative_signal (void);
 477 gint mono_threads_suspend_get_suspend_signal (void);
 478 gint mono_threads_suspend_get_restart_signal (void);
 479 gint mono_threads_suspend_get_abort_signal (void);
 480
 481 int mono_threads_platform_create_thread (MonoThreadStart thread_fn, gpointer thread_data, gsize* const stack_size, MonoNativeThreadId *out_tid);
 482 void mono_threads_platform_get_stack_bounds (guint8 **staddr, size_t *stsize);
 483 void mono_threads_platform_init (void);
 484 gboolean mono_threads_platform_in_critical_region (MonoNativeThreadId tid);
 485 gboolean mono_threads_platform_yield (void);
 486 void mono_threads_platform_exit (gsize exit_code);
 487
 488 void mono_threads_coop_begin_global_suspend (void);
 489 void mono_threads_coop_end_global_suspend (void);
 490
 491 MONO_API MonoNativeThreadId
 492 mono_native_thread_id_get (void);
 493
 494 MONO_API gboolean
 495 mono_native_thread_id_equals (MonoNativeThreadId id1, MonoNativeThreadId id2);
 496
 497 MONO_API gboolean
 498 mono_native_thread_create (MonoNativeThreadId *tid, gpointer func, gpointer arg);
 499
 500 MONO_API void
 501 mono_native_thread_set_name (MonoNativeThreadId tid, const char *name);
 502
 503 MONO_API gboolean
 504 mono_native_thread_join (MonoNativeThreadId tid);
 505
 506 /*Mach specific internals */
 507 void mono_threads_init_dead_letter (void);
 508 void mono_threads_install_dead_letter (void);
 509
 510 /* mono-threads internal API used by the backends. */
 511 /*
 512 This tells the suspend initiator that we completed suspend and will now be waiting for resume.
 513 */
 514 void mono_threads_notify_initiator_of_suspend (THREAD_INFO_TYPE* info);
 515 /*
 516 This tells the resume initiator that we completed resume duties and will return to runnable state.
 517 */
 518 void mono_threads_notify_initiator_of_resume (THREAD_INFO_TYPE* info);
 519
 520 /*
 521 This tells the resume initiator that we completed abort duties and will return to previous state.
 522 */
 523 void mono_threads_notify_initiator_of_abort (THREAD_INFO_TYPE* info);
 524
 525 /* Thread state machine functions */
 526
 527 typedef enum {
 528         ResumeError,
 529         ResumeOk,
 530         ResumeInitSelfResume,
 531         ResumeInitAsyncResume,
 532         ResumeInitBlockingResume,
 533 } MonoResumeResult;
 534
 535 typedef enum {
 536         SelfSuspendResumed,
 537         SelfSuspendWait,
 538         SelfSuspendNotifyAndWait,
 539 } MonoSelfSupendResult;
 540
 541 typedef enum {
 542         AsyncSuspendAlreadySuspended,
 543         AsyncSuspendWait,
 544         AsyncSuspendInitSuspend,
 545         AsyncSuspendBlocking,
 546 } MonoRequestAsyncSuspendResult;
 547
 548 typedef enum {
 549         DoBlockingContinue, //in blocking mode, continue
 550         DoBlockingPollAndRetry, //async suspend raced blocking and won, pool and retry
 551 } MonoDoBlockingResult;
 552
 553 typedef enum {
 554         DoneBlockingOk, //exited blocking fine
 555         DoneBlockingWait, //thread should end suspended
 556 } MonoDoneBlockingResult;
 557
 558
 559 typedef enum {
 560         AbortBlockingIgnore, //Ignore
 561         AbortBlockingIgnoreAndPoll, //Ignore and poll
 562         AbortBlockingOk, //Abort worked
 563         AbortBlockingWait, //Abort worked, but should wait for resume
 564 } MonoAbortBlockingResult;
 565
 566
 567 void mono_threads_transition_attach (THREAD_INFO_TYPE* info);
 568 gboolean mono_threads_transition_detach (THREAD_INFO_TYPE *info);
 569 MonoRequestAsyncSuspendResult mono_threads_transition_request_async_suspension (THREAD_INFO_TYPE *info);
 570 MonoSelfSupendResult mono_threads_transition_state_poll (THREAD_INFO_TYPE *info);
 571 MonoResumeResult mono_threads_transition_request_resume (THREAD_INFO_TYPE* info);
 572 gboolean mono_threads_transition_finish_async_suspend (THREAD_INFO_TYPE* info);
 573 MonoDoBlockingResult mono_threads_transition_do_blocking (THREAD_INFO_TYPE* info);
 574 MonoDoneBlockingResult mono_threads_transition_done_blocking (THREAD_INFO_TYPE* info);
 575 MonoAbortBlockingResult mono_threads_transition_abort_blocking (THREAD_INFO_TYPE* info);
 576
 577 MonoThreadUnwindState* mono_thread_info_get_suspend_state (THREAD_INFO_TYPE *info);
 578
 579 gpointer
 580 mono_threads_enter_gc_unsafe_region_cookie (void);
 581
 582
 583 void mono_thread_info_wait_for_resume (THREAD_INFO_TYPE *info);
 584 /* Advanced suspend API, used for suspending multiple threads as once. */
 585 gboolean mono_thread_info_is_running (THREAD_INFO_TYPE *info);
 586 gboolean mono_thread_info_is_live (THREAD_INFO_TYPE *info);
 587 int mono_thread_info_suspend_count (THREAD_INFO_TYPE *info);
 588 int mono_thread_info_current_state (THREAD_INFO_TYPE *info);
 589 const char* mono_thread_state_name (int state);
 590
 591 gboolean mono_thread_info_in_critical_location (THREAD_INFO_TYPE *info);
 592 gboolean mono_thread_info_begin_suspend (THREAD_INFO_TYPE *info);
 593 gboolean mono_thread_info_begin_resume (THREAD_INFO_TYPE *info);
 594
 595 void mono_threads_add_to_pending_operation_set (THREAD_INFO_TYPE* info); //XXX rename to something to reflect the fact that this is used for both suspend and resume
 596 gboolean mono_threads_wait_pending_operations (void);
 597 void mono_threads_begin_global_suspend (void);
 598 void mono_threads_end_global_suspend (void);
 599
 600 gboolean
 601 mono_thread_info_is_current (THREAD_INFO_TYPE *info);
 602
 603 typedef enum {
 604         MONO_THREAD_INFO_WAIT_RET_SUCCESS_0   =  0,
 605         MONO_THREAD_INFO_WAIT_RET_ALERTED     = -1,
 606         MONO_THREAD_INFO_WAIT_RET_TIMEOUT     = -2,
 607         MONO_THREAD_INFO_WAIT_RET_FAILED      = -3,
 608 } MonoThreadInfoWaitRet;
 609
 610 MonoThreadInfoWaitRet
 611 mono_thread_info_wait_one_handle (MonoThreadHandle *handle, guint32 timeout, gboolean alertable);
 612
 613 MonoThreadInfoWaitRet
 614 mono_thread_info_wait_multiple_handle (MonoThreadHandle **thread_handles, gsize nhandles, MonoOSEvent *background_change_event, gboolean waitall, guint32 timeout, gboolean alertable);
 615
 616 #endif /* __MONO_THREADS_H__ */