mcs/class/corlib/System.Threading/Thread.cs

   1 //
   2 // System.Threading.Thread.cs
   3 //
   4 // Author:
   5 //   Dick Porter (dick@ximian.com)
   6 //
   7 // (C) Ximian, Inc.  http://www.ximian.com
   8 // Copyright (C) 2004-2006 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Runtime.Remoting.Contexts;
  31 using System.Runtime.Serialization;
  32 using System.Runtime.Serialization.Formatters.Binary;
  33 using System.Security.Permissions;
  34 using System.Security.Principal;
  35 using System.Globalization;
  36 using System.Runtime.CompilerServices;
  37 using System.Runtime.InteropServices;
  38 using System.IO;
  39 using System.Collections.Generic;
  40 using System.Reflection;
  41 using System.Security;
  42 using System.Diagnostics;
  43 using System.Runtime.ConstrainedExecution;
  44
  45 namespace System.Threading {
  46         [StructLayout (LayoutKind.Sequential)]
  47         sealed class InternalThread : CriticalFinalizerObject {
  48 #pragma warning disable 169, 414, 649
  49                 #region Sync with metadata/object-internals.h
  50                 int lock_thread_id;
  51                 // stores a thread handle
  52                 internal IntPtr system_thread_handle;
  53
  54                 /* Note this is an opaque object (an array), not a CultureInfo */
  55                 private object cached_culture_info;
  56                 /* accessed only from unmanaged code */
  57                 private IntPtr name;
  58                 private int name_len;
  59                 private ThreadState state;
  60                 private object abort_exc;
  61                 private int abort_state_handle;
  62                 /* thread_id is only accessed from unmanaged code */
  63                 internal Int64 thread_id;
  64
  65                 /* start_notify is used by the runtime to signal that Start()
  66                  * is ok to return
  67                  */
  68                 private IntPtr start_notify;
  69                 private IntPtr stack_ptr;
  70                 private UIntPtr static_data; /* GC-tracked */
  71                 private IntPtr runtime_thread_info;
  72                 /* current System.Runtime.Remoting.Contexts.Context instance
  73                    keep as an object to avoid triggering its class constructor when not needed */
  74                 private object current_appcontext;
  75                 private object root_domain_thread;
  76                 internal byte[] _serialized_principal;
  77                 internal int _serialized_principal_version;
  78                 private IntPtr appdomain_refs;
  79                 private int interruption_requested;
  80                 private IntPtr synch_cs;
  81                 internal bool threadpool_thread;
  82                 private bool thread_interrupt_requested;
  83                 /* These are used from managed code */
  84                 internal int stack_size;
  85                 internal byte apartment_state;
  86                 internal volatile int critical_region_level;
  87                 internal int managed_id;
  88                 private int small_id;
  89                 private IntPtr manage_callback;
  90                 private IntPtr interrupt_on_stop;
  91                 private IntPtr flags;
  92                 private IntPtr thread_pinning_ref;
  93                 private IntPtr start_notify_refcount;
  94                 /*
  95                  * These fields are used to avoid having to increment corlib versions
  96                  * when a new field is added to the unmanaged MonoThread structure.
  97                  */
  98                 private IntPtr unused2;
  99                 #endregion
 100 #pragma warning restore 169, 414, 649
 101
 102                 // Closes the system thread handle
 103                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 104                 private extern void Thread_free_internal(IntPtr handle);
 105
 106                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 107                 ~InternalThread() {
 108                         Thread_free_internal(system_thread_handle);
 109                 }
 110         }
 111
 112         [StructLayout (LayoutKind.Sequential)]
 113         public sealed partial class Thread {
 114 #pragma warning disable 414
 115                 #region Sync with metadata/object-internals.h
 116                 private InternalThread internal_thread;
 117                 object m_ThreadStartArg;
 118                 object pending_exception;
 119                 int priority = (int) ThreadPriority.Normal;
 120                 #endregion
 121 #pragma warning restore 414
 122
 123                 IPrincipal principal;
 124                 int principal_version;
 125
 126                 // the name of current_thread is
 127                 // important because they are used by the runtime.
 128
 129                 [ThreadStatic]
 130                 static Thread current_thread;
 131
 132                 // can be both a ThreadStart and a ParameterizedThreadStart
 133                 private MulticastDelegate m_Delegate;
 134
 135                 private ExecutionContext m_ExecutionContext;    // this call context follows the logical thread
 136
 137                 private bool m_ExecutionContextBelongsToOuterScope;
 138
 139                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 140                 private extern void ConstructInternalThread ();
 141
 142                 private InternalThread Internal {
 143                         get {
 144                                 if (internal_thread == null)
 145                                         ConstructInternalThread ();
 146                                 return internal_thread;
 147                         }
 148                 }
 149
 150                 public static Context CurrentContext {
 151                         [SecurityPermission (SecurityAction.LinkDemand, Infrastructure=true)]
 152                         get {
 153                                 return(AppDomain.InternalGetContext ());
 154                         }
 155                 }
 156
 157                 /*
 158                  * These two methods return an array in the target
 159                  * domain with the same content as the argument.  If
 160                  * the argument is already in the target domain, then
 161                  * the argument is returned, otherwise a copy.
 162                  */
 163                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 164                 private extern static byte[] ByteArrayToRootDomain (byte[] arr);
 165
 166                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 167                 private extern static byte[] ByteArrayToCurrentDomain (byte[] arr);
 168
 169                 static void DeserializePrincipal (Thread th)
 170                 {
 171                         MemoryStream ms = new MemoryStream (ByteArrayToCurrentDomain (th.Internal._serialized_principal));
 172                         int type = ms.ReadByte ();
 173                         if (type == 0) {
 174                                 BinaryFormatter bf = new BinaryFormatter ();
 175                                 th.principal = (IPrincipal) bf.Deserialize (ms);
 176                                 th.principal_version = th.Internal._serialized_principal_version;
 177                         } else if (type == 1) {
 178                                 BinaryReader reader = new BinaryReader (ms);
 179                                 string name = reader.ReadString ();
 180                                 string auth_type = reader.ReadString ();
 181                                 int n_roles = reader.ReadInt32 ();
 182                                 string [] roles = null;
 183                                 if (n_roles >= 0) {
 184                                         roles = new string [n_roles];
 185                                         for (int i = 0; i < n_roles; i++)
 186                                                 roles [i] = reader.ReadString ();
 187                                 }
 188                                 th.principal = new GenericPrincipal (new GenericIdentity (name, auth_type), roles);
 189                         } else if (type == 2 || type == 3) {
 190                                 string [] roles = type == 2 ? null : new string [0];
 191                                 th.principal = new GenericPrincipal (new GenericIdentity ("", ""), roles);
 192                         }
 193                 }
 194
 195                 static void SerializePrincipal (Thread th, IPrincipal value)
 196                 {
 197                         MemoryStream ms = new MemoryStream ();
 198                         bool done = false;
 199                         if (value.GetType () == typeof (GenericPrincipal)) {
 200                                 GenericPrincipal gp = (GenericPrincipal) value;
 201                                 if (gp.Identity != null && gp.Identity.GetType () == typeof (GenericIdentity)) {
 202                                         GenericIdentity id = (GenericIdentity) gp.Identity;
 203                                         if (id.Name == "" && id.AuthenticationType == "") {
 204                                                 if (gp.Roles == null) {
 205                                                         ms.WriteByte (2);
 206                                                         done = true;
 207                                                 } else if (gp.Roles.Length == 0) {
 208                                                         ms.WriteByte (3);
 209                                                         done = true;
 210                                                 }
 211                                         } else {
 212                                                 ms.WriteByte (1);
 213                                                 BinaryWriter br = new BinaryWriter (ms);
 214                                                 br.Write (gp.Identity.Name);
 215                                                 br.Write (gp.Identity.AuthenticationType);
 216                                                 string [] roles = gp.Roles;
 217                                                 if  (roles == null) {
 218                                                         br.Write ((int) (-1));
 219                                                 } else {
 220                                                         br.Write (roles.Length);
 221                                                         foreach (string s in roles) {
 222                                                                 br.Write (s);
 223                                                         }
 224                                                 }
 225                                                 br.Flush ();
 226                                                 done = true;
 227                                         }
 228                                 }
 229                         }
 230                         if (!done) {
 231                                 ms.WriteByte (0);
 232                                 BinaryFormatter bf = new BinaryFormatter ();
 233                                 try {
 234                                         bf.Serialize (ms, value);
 235                                 } catch {}
 236                         }
 237                         th.Internal._serialized_principal = ByteArrayToRootDomain (ms.ToArray ());
 238                 }
 239
 240                 public static IPrincipal CurrentPrincipal {
 241                         get {
 242                                 Thread th = CurrentThread;
 243
 244                                 if (th.principal_version != th.Internal._serialized_principal_version)
 245                                         th.principal = null;
 246
 247                                 if (th.principal != null)
 248                                         return th.principal;
 249
 250                                 if (th.Internal._serialized_principal != null) {
 251                                         try {
 252                                                 DeserializePrincipal (th);
 253                                                 return th.principal;
 254                                         } catch {}
 255                                 }
 256
 257                                 th.principal = GetDomain ().DefaultPrincipal;
 258                                 th.principal_version = th.Internal._serialized_principal_version;
 259                                 return th.principal;
 260                         }
 261                         [SecurityPermission (SecurityAction.Demand, ControlPrincipal = true)]
 262                         set {
 263                                 Thread th = CurrentThread;
 264
 265                                 if (value != GetDomain ().DefaultPrincipal) {
 266                                         ++th.Internal._serialized_principal_version;
 267                                         try {
 268                                                 SerializePrincipal (th, value);
 269                                         } catch (Exception) {
 270                                                 th.Internal._serialized_principal = null;
 271                                         }
 272                                         th.principal_version = th.Internal._serialized_principal_version;
 273                                 } else {
 274                                         th.Internal._serialized_principal = null;
 275                                 }
 276
 277                                 th.principal = value;
 278                         }
 279                 }
 280
 281                 // Looks up the object associated with the current thread
 282                 // this is called by the JIT directly, too
 283                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 284                 private extern static InternalThread CurrentInternalThread_internal();
 285
 286                 public static Thread CurrentThread {
 287                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 288                         get {
 289                                 if (current_thread == null)
 290                                         current_thread = new Thread (CurrentInternalThread_internal ());
 291                                 return current_thread;
 292                         }
 293                 }
 294
 295                 internal static int CurrentThreadId {
 296                         get {
 297                                 return (int)(CurrentThread.internal_thread.thread_id);
 298                         }
 299                 }
 300
 301                 public static AppDomain GetDomain() {
 302                         return AppDomain.CurrentDomain;
 303                 }
 304
 305                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 306                 public extern static int GetDomainID();
 307
 308                 // Returns the system thread handle
 309                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 310                 private extern IntPtr Thread_internal (MulticastDelegate start);
 311
 312                 private Thread (InternalThread it) {
 313                         internal_thread = it;
 314                 }
 315
 316                 // part of ".NETPortable,Version=v4.0,Profile=Profile3" i.e. FX4 and SL4
 317                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 318                 ~Thread ()
 319                 {
 320                 }
 321
 322                 [Obsolete ("Deprecated in favor of GetApartmentState, SetApartmentState and TrySetApartmentState.")]
 323                 public ApartmentState ApartmentState {
 324                         get {
 325                                 if ((ThreadState & ThreadState.Stopped) != 0)
 326                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 327
 328                                 return (ApartmentState)Internal.apartment_state;
 329                         }
 330
 331                         set {
 332                                 TrySetApartmentState (value);
 333                         }
 334                 }
 335
 336                 public bool IsThreadPoolThread {
 337                         get {
 338                                 return IsThreadPoolThreadInternal;
 339                         }
 340                 }
 341
 342                 internal bool IsThreadPoolThreadInternal {
 343                         get {
 344                                 return Internal.threadpool_thread;
 345                         }
 346                         set {
 347                                 Internal.threadpool_thread = value;
 348                         }
 349                 }
 350
 351                 public bool IsAlive {
 352                         get {
 353                                 ThreadState curstate = GetState (Internal);
 354
 355                                 if((curstate & ThreadState.Aborted) != 0 ||
 356                                    (curstate & ThreadState.Stopped) != 0 ||
 357                                    (curstate & ThreadState.Unstarted) != 0) {
 358                                         return(false);
 359                                 } else {
 360                                         return(true);
 361                                 }
 362                         }
 363                 }
 364
 365                 public bool IsBackground {
 366                         get {
 367                                 ThreadState thread_state = GetState (Internal);
 368                                 if ((thread_state & ThreadState.Stopped) != 0)
 369                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 370
 371                                 return (thread_state & ThreadState.Background) != 0;
 372                         }
 373
 374                         set {
 375                                 if (value) {
 376                                         SetState (Internal, ThreadState.Background);
 377                                 } else {
 378                                         ClrState (Internal, ThreadState.Background);
 379                                 }
 380                         }
 381                 }
 382
 383                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 384                 private extern static string GetName_internal (InternalThread thread);
 385
 386                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 387                 private extern static void SetName_internal (InternalThread thread, String name);
 388
 389                 /*
 390                  * The thread name must be shared by appdomains, so it is stored in
 391                  * unmanaged code.
 392                  */
 393
 394                 public string Name {
 395                         get {
 396                                 return GetName_internal (Internal);
 397                         }
 398
 399                         set {
 400                                 SetName_internal (Internal, value);
 401                         }
 402                 }
 403
 404                 public ThreadState ThreadState {
 405                         get {
 406                                 return GetState (Internal);
 407                         }
 408                 }
 409
 410 #if MONO_FEATURE_THREAD_ABORT
 411                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 412                 private extern static void Abort_internal (InternalThread thread, object stateInfo);
 413
 414                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 415                 public void Abort ()
 416                 {
 417                         Abort_internal (Internal, null);
 418                 }
 419
 420                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 421                 public void Abort (object stateInfo)
 422                 {
 423                         Abort_internal (Internal, stateInfo);
 424                 }
 425
 426                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 427                 extern object GetAbortExceptionState ();
 428
 429                 internal object AbortReason {
 430                         get {
 431                                 return GetAbortExceptionState ();
 432                         }
 433                 }
 434
 435                 void ClearAbortReason ()
 436                 {
 437                 }
 438 #else
 439                 [Obsolete ("Thread.Abort is not supported on the current platform.", true)]
 440                 public void Abort ()
 441                 {
 442                         throw new PlatformNotSupportedException ("Thread.Abort is not supported on the current platform.");
 443                 }
 444
 445                 [Obsolete ("Thread.Abort is not supported on the current platform.", true)]
 446                 public void Abort (object stateInfo)
 447                 {
 448                         throw new PlatformNotSupportedException ("Thread.Abort is not supported on the current platform.");
 449                 }
 450
 451                 [Obsolete ("Thread.ResetAbort is not supported on the current platform.", true)]
 452                 public static void ResetAbort ()
 453                 {
 454                         throw new PlatformNotSupportedException ("Thread.ResetAbort is not supported on the current platform.");
 455                 }
 456 #endif // MONO_FEATURE_THREAD_ABORT
 457
 458                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 459                 private extern static void SpinWait_nop ();
 460
 461
 462                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 463                 public static void SpinWait (int iterations)
 464                 {
 465                         if (iterations < 0)
 466                                 return;
 467                         while (iterations-- > 0)
 468                         {
 469                                 SpinWait_nop ();
 470                         }
 471                 }
 472
 473                 void StartInternal (IPrincipal principal, ref StackCrawlMark stackMark)
 474                 {
 475 #if FEATURE_ROLE_BASED_SECURITY
 476                         Internal._serialized_principal = CurrentThread.Internal._serialized_principal;
 477 #endif
 478
 479                         // Thread_internal creates and starts the new thread,
 480                         if (Thread_internal(m_Delegate) == IntPtr.Zero)
 481                                 throw new SystemException ("Thread creation failed.");
 482
 483                         m_ThreadStartArg = null;
 484                 }
 485
 486                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 487                 extern private static void SetState (InternalThread thread, ThreadState set);
 488
 489                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 490                 extern private static void ClrState (InternalThread thread, ThreadState clr);
 491
 492                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 493                 extern private static ThreadState GetState (InternalThread thread);
 494
 495                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 496                 extern public static byte VolatileRead (ref byte address);
 497
 498                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 499                 extern public static double VolatileRead (ref double address);
 500
 501                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 502                 extern public static short VolatileRead (ref short address);
 503
 504                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 505                 extern public static int VolatileRead (ref int address);
 506
 507                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 508                 extern public static long VolatileRead (ref long address);
 509
 510                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 511                 extern public static IntPtr VolatileRead (ref IntPtr address);
 512
 513                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 514                 extern public static object VolatileRead (ref object address);
 515
 516                 [CLSCompliant(false)]
 517                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 518                 extern public static sbyte VolatileRead (ref sbyte address);
 519
 520                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 521                 extern public static float VolatileRead (ref float address);
 522
 523                 [CLSCompliant (false)]
 524                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 525                 extern public static ushort VolatileRead (ref ushort address);
 526
 527                 [CLSCompliant (false)]
 528                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 529                 extern public static uint VolatileRead (ref uint address);
 530
 531                 [CLSCompliant (false)]
 532                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 533                 extern public static ulong VolatileRead (ref ulong address);
 534
 535                 [CLSCompliant (false)]
 536                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 537                 extern public static UIntPtr VolatileRead (ref UIntPtr address);
 538
 539                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 540                 extern public static void VolatileWrite (ref byte address, byte value);
 541
 542                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 543                 extern public static void VolatileWrite (ref double address, double value);
 544
 545                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 546                 extern public static void VolatileWrite (ref short address, short value);
 547
 548                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 549                 extern public static void VolatileWrite (ref int address, int value);
 550
 551                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 552                 extern public static void VolatileWrite (ref long address, long value);
 553
 554                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 555                 extern public static void VolatileWrite (ref IntPtr address, IntPtr value);
 556
 557                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 558                 extern public static void VolatileWrite (ref object address, object value);
 559
 560                 [CLSCompliant(false)]
 561                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 562                 extern public static void VolatileWrite (ref sbyte address, sbyte value);
 563
 564                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 565                 extern public static void VolatileWrite (ref float address, float value);
 566
 567                 [CLSCompliant (false)]
 568                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 569                 extern public static void VolatileWrite (ref ushort address, ushort value);
 570
 571                 [CLSCompliant (false)]
 572                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 573                 extern public static void VolatileWrite (ref uint address, uint value);
 574
 575                 [CLSCompliant (false)]
 576                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 577                 extern public static void VolatileWrite (ref ulong address, ulong value);
 578
 579                 [CLSCompliant (false)]
 580                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 581                 extern public static void VolatileWrite (ref UIntPtr address, UIntPtr value);
 582
 583                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 584                 extern static int SystemMaxStackStize ();
 585
 586                 static int GetProcessDefaultStackSize (int maxStackSize)
 587                 {
 588                         if (maxStackSize == 0)
 589                                 return 0;
 590
 591                         if (maxStackSize < 131072) // make sure stack is at least 128k big
 592                                 return 131072;
 593
 594                         int page_size = Environment.GetPageSize ();
 595
 596                         if ((maxStackSize % page_size) != 0) // round up to a divisible of page size
 597                                 maxStackSize = (maxStackSize / (page_size - 1)) * page_size;
 598
 599                         /* Respect the max stack size imposed by the system*/
 600                         return Math.Min (maxStackSize, SystemMaxStackStize ());
 601                 }
 602
 603                 void SetStart (MulticastDelegate start, int maxStackSize)
 604                 {
 605                         m_Delegate = start;
 606                         Internal.stack_size = maxStackSize;
 607                 }
 608
 609                 public int ManagedThreadId {
 610                         [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 611                         get {
 612                                 return Internal.managed_id;
 613                         }
 614                 }
 615
 616                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 617                 public static void BeginCriticalRegion ()
 618                 {
 619                         CurrentThread.Internal.critical_region_level++;
 620                 }
 621
 622                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 623                 public static void EndCriticalRegion ()
 624                 {
 625                         CurrentThread.Internal.critical_region_level--;
 626                 }
 627
 628                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 629                 public static void BeginThreadAffinity ()
 630                 {
 631                         // Managed and native threads are currently bound together.
 632                 }
 633
 634                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 635                 public static void EndThreadAffinity ()
 636                 {
 637                         // Managed and native threads are currently bound together.
 638                 }
 639
 640                 public ApartmentState GetApartmentState ()
 641                 {
 642                         return (ApartmentState)Internal.apartment_state;
 643                 }
 644
 645                 public void SetApartmentState (ApartmentState state)
 646                 {
 647                         if (!TrySetApartmentState (state))
 648                                 throw new InvalidOperationException ("Failed to set the specified COM apartment state.");
 649                 }
 650
 651                 public bool TrySetApartmentState (ApartmentState state)
 652                 {
 653                         if ((ThreadState & ThreadState.Unstarted) == 0)
 654                                 throw new ThreadStateException ("Thread was in an invalid state for the operation being executed.");
 655
 656                         if ((ApartmentState)Internal.apartment_state != ApartmentState.Unknown &&
 657                             (ApartmentState)Internal.apartment_state != state)
 658                                 return false;
 659
 660                         Internal.apartment_state = (byte)state;
 661
 662                         return true;
 663                 }
 664
 665                 [ComVisible (false)]
 666                 public override int GetHashCode ()
 667                 {
 668                         return ManagedThreadId;
 669                 }
 670
 671                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 672                 internal static extern void GetStackTraces (out Thread[] threads, out object[] stack_frames);
 673
 674                 // This is a mono extension to gather the stack traces for all running threads
 675                 internal static Dictionary<Thread, StackTrace> Mono_GetStackTraces () {
 676                         Thread[] threads;
 677                         object[] stack_frames;
 678
 679                         GetStackTraces (out threads, out stack_frames);
 680
 681                         var res = new Dictionary<Thread, StackTrace> ();
 682                         for (int i = 0; i < threads.Length; ++i)
 683                                 res [threads [i]] = new StackTrace ((StackFrame[])stack_frames [i]);
 684                         return res;
 685                 }
 686
 687 #if !MONO_FEATURE_THREAD_SUSPEND_RESUME
 688                 [Obsolete ("Thread.Suspend is not supported on the current platform.", true)]
 689                 public void Suspend ()
 690                 {
 691                         throw new PlatformNotSupportedException ("Thread.Suspend is not supported on the current platform.");
 692                 }
 693
 694                 [Obsolete ("Thread.Resume is not supported on the current platform.", true)]
 695                 public void Resume ()
 696                 {
 697                         throw new PlatformNotSupportedException ("Thread.Resume is not supported on the current platform.");
 698                 }
 699 #endif
 700         }
 701 }