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 stack_ptr;
  69                 private UIntPtr static_data; /* GC-tracked */
  70                 private IntPtr runtime_thread_info;
  71                 /* current System.Runtime.Remoting.Contexts.Context instance
  72                    keep as an object to avoid triggering its class constructor when not needed */
  73                 private object current_appcontext;
  74                 private object root_domain_thread;
  75                 internal byte[] _serialized_principal;
  76                 internal int _serialized_principal_version;
  77                 private IntPtr appdomain_refs;
  78                 private int interruption_requested;
  79                 private IntPtr synch_cs;
  80                 internal bool threadpool_thread;
  81                 private bool thread_interrupt_requested;
  82                 /* These are used from managed code */
  83                 internal int stack_size;
  84                 internal byte apartment_state;
  85                 internal volatile int critical_region_level;
  86                 internal int managed_id;
  87                 private int small_id;
  88                 private IntPtr manage_callback;
  89                 private IntPtr interrupt_on_stop;
  90                 private IntPtr flags;
  91                 private IntPtr thread_pinning_ref;
  92                 private IntPtr abort_protected_block_count;
  93                 private int priority = (int) ThreadPriority.Normal;
  94                 private IntPtr owned_mutex;
  95                 /*
  96                  * These fields are used to avoid having to increment corlib versions
  97                  * when a new field is added to the unmanaged MonoThread structure.
  98                  */
  99                 private IntPtr unused1;
 100                 private IntPtr unused2;
 101
 102                 /* This is used only to check that we are in sync between the representation
 103                  * of MonoInternalThread in native and InternalThread in managed
 104                  *
 105                  * DO NOT RENAME! DO NOT ADD FIELDS AFTER! */
 106                 private IntPtr last;
 107                 #endregion
 108 #pragma warning restore 169, 414, 649
 109
 110                 // Closes the system thread handle
 111                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 112                 private extern void Thread_free_internal(IntPtr handle);
 113
 114                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 115                 ~InternalThread() {
 116                         Thread_free_internal(system_thread_handle);
 117                 }
 118         }
 119
 120         [StructLayout (LayoutKind.Sequential)]
 121         public sealed partial class Thread {
 122 #pragma warning disable 414
 123                 #region Sync with metadata/object-internals.h
 124                 private InternalThread internal_thread;
 125                 object m_ThreadStartArg;
 126                 object pending_exception;
 127                 #endregion
 128 #pragma warning restore 414
 129
 130                 IPrincipal principal;
 131                 int principal_version;
 132
 133                 // the name of current_thread is
 134                 // important because they are used by the runtime.
 135
 136                 [ThreadStatic]
 137                 static Thread current_thread;
 138
 139                 // can be both a ThreadStart and a ParameterizedThreadStart
 140                 private MulticastDelegate m_Delegate;
 141
 142                 private ExecutionContext m_ExecutionContext;    // this call context follows the logical thread
 143
 144                 private bool m_ExecutionContextBelongsToOuterScope;
 145
 146                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 147                 private extern void ConstructInternalThread ();
 148
 149                 private InternalThread Internal {
 150                         get {
 151                                 if (internal_thread == null)
 152                                         ConstructInternalThread ();
 153                                 return internal_thread;
 154                         }
 155                 }
 156
 157                 public static Context CurrentContext {
 158                         [SecurityPermission (SecurityAction.LinkDemand, Infrastructure=true)]
 159                         get {
 160                                 return(AppDomain.InternalGetContext ());
 161                         }
 162                 }
 163
 164                 /*
 165                  * These two methods return an array in the target
 166                  * domain with the same content as the argument.  If
 167                  * the argument is already in the target domain, then
 168                  * the argument is returned, otherwise a copy.
 169                  */
 170                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 171                 private extern static byte[] ByteArrayToRootDomain (byte[] arr);
 172
 173                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 174                 private extern static byte[] ByteArrayToCurrentDomain (byte[] arr);
 175
 176                 static void DeserializePrincipal (Thread th)
 177                 {
 178                         MemoryStream ms = new MemoryStream (ByteArrayToCurrentDomain (th.Internal._serialized_principal));
 179                         int type = ms.ReadByte ();
 180                         if (type == 0) {
 181                                 BinaryFormatter bf = new BinaryFormatter ();
 182                                 th.principal = (IPrincipal) bf.Deserialize (ms);
 183                                 th.principal_version = th.Internal._serialized_principal_version;
 184                         } else if (type == 1) {
 185                                 BinaryReader reader = new BinaryReader (ms);
 186                                 string name = reader.ReadString ();
 187                                 string auth_type = reader.ReadString ();
 188                                 int n_roles = reader.ReadInt32 ();
 189                                 string [] roles = null;
 190                                 if (n_roles >= 0) {
 191                                         roles = new string [n_roles];
 192                                         for (int i = 0; i < n_roles; i++)
 193                                                 roles [i] = reader.ReadString ();
 194                                 }
 195                                 th.principal = new GenericPrincipal (new GenericIdentity (name, auth_type), roles);
 196                         } else if (type == 2 || type == 3) {
 197                                 string [] roles = type == 2 ? null : new string [0];
 198                                 th.principal = new GenericPrincipal (new GenericIdentity ("", ""), roles);
 199                         }
 200                 }
 201
 202                 static void SerializePrincipal (Thread th, IPrincipal value)
 203                 {
 204                         MemoryStream ms = new MemoryStream ();
 205                         bool done = false;
 206                         if (value.GetType () == typeof (GenericPrincipal)) {
 207                                 GenericPrincipal gp = (GenericPrincipal) value;
 208                                 if (gp.Identity != null && gp.Identity.GetType () == typeof (GenericIdentity)) {
 209                                         GenericIdentity id = (GenericIdentity) gp.Identity;
 210                                         if (id.Name == "" && id.AuthenticationType == "") {
 211                                                 if (gp.Roles == null) {
 212                                                         ms.WriteByte (2);
 213                                                         done = true;
 214                                                 } else if (gp.Roles.Length == 0) {
 215                                                         ms.WriteByte (3);
 216                                                         done = true;
 217                                                 }
 218                                         } else {
 219                                                 ms.WriteByte (1);
 220                                                 BinaryWriter br = new BinaryWriter (ms);
 221                                                 br.Write (gp.Identity.Name);
 222                                                 br.Write (gp.Identity.AuthenticationType);
 223                                                 string [] roles = gp.Roles;
 224                                                 if  (roles == null) {
 225                                                         br.Write ((int) (-1));
 226                                                 } else {
 227                                                         br.Write (roles.Length);
 228                                                         foreach (string s in roles) {
 229                                                                 br.Write (s);
 230                                                         }
 231                                                 }
 232                                                 br.Flush ();
 233                                                 done = true;
 234                                         }
 235                                 }
 236                         }
 237                         if (!done) {
 238                                 ms.WriteByte (0);
 239                                 BinaryFormatter bf = new BinaryFormatter ();
 240                                 try {
 241                                         bf.Serialize (ms, value);
 242                                 } catch {}
 243                         }
 244                         th.Internal._serialized_principal = ByteArrayToRootDomain (ms.ToArray ());
 245                 }
 246
 247                 public static IPrincipal CurrentPrincipal {
 248                         get {
 249                                 Thread th = CurrentThread;
 250
 251                                 if (th.principal_version != th.Internal._serialized_principal_version)
 252                                         th.principal = null;
 253
 254                                 if (th.principal != null)
 255                                         return th.principal;
 256
 257                                 if (th.Internal._serialized_principal != null) {
 258                                         try {
 259                                                 DeserializePrincipal (th);
 260                                                 return th.principal;
 261                                         } catch {}
 262                                 }
 263
 264                                 th.principal = GetDomain ().DefaultPrincipal;
 265                                 th.principal_version = th.Internal._serialized_principal_version;
 266                                 return th.principal;
 267                         }
 268                         [SecurityPermission (SecurityAction.Demand, ControlPrincipal = true)]
 269                         set {
 270                                 Thread th = CurrentThread;
 271
 272                                 if (value != GetDomain ().DefaultPrincipal) {
 273                                         ++th.Internal._serialized_principal_version;
 274                                         try {
 275                                                 SerializePrincipal (th, value);
 276                                         } catch (Exception) {
 277                                                 th.Internal._serialized_principal = null;
 278                                         }
 279                                         th.principal_version = th.Internal._serialized_principal_version;
 280                                 } else {
 281                                         th.Internal._serialized_principal = null;
 282                                 }
 283
 284                                 th.principal = value;
 285                         }
 286                 }
 287
 288                 // Looks up the object associated with the current thread
 289                 // this is called by the JIT directly, too
 290                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 291                 private extern static InternalThread CurrentInternalThread_internal();
 292
 293                 public static Thread CurrentThread {
 294                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 295                         get {
 296                                 if (current_thread == null)
 297                                         current_thread = new Thread (CurrentInternalThread_internal ());
 298                                 return current_thread;
 299                         }
 300                 }
 301
 302                 internal static int CurrentThreadId {
 303                         get {
 304                                 return (int)(CurrentThread.internal_thread.thread_id);
 305                         }
 306                 }
 307
 308                 public static AppDomain GetDomain() {
 309                         return AppDomain.CurrentDomain;
 310                 }
 311
 312                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 313                 public extern static int GetDomainID();
 314
 315                 // Returns the system thread handle
 316                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 317                 private extern IntPtr Thread_internal (MulticastDelegate start);
 318
 319                 private Thread (InternalThread it) {
 320                         internal_thread = it;
 321                 }
 322
 323                 // part of ".NETPortable,Version=v4.0,Profile=Profile3" i.e. FX4 and SL4
 324                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 325                 ~Thread ()
 326                 {
 327                 }
 328
 329                 [Obsolete ("Deprecated in favor of GetApartmentState, SetApartmentState and TrySetApartmentState.")]
 330                 public ApartmentState ApartmentState {
 331                         get {
 332                                 if ((ThreadState & ThreadState.Stopped) != 0)
 333                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 334
 335                                 return (ApartmentState)Internal.apartment_state;
 336                         }
 337
 338                         set {
 339                                 TrySetApartmentState (value);
 340                         }
 341                 }
 342
 343                 public bool IsThreadPoolThread {
 344                         get {
 345                                 return IsThreadPoolThreadInternal;
 346                         }
 347                 }
 348
 349                 internal bool IsThreadPoolThreadInternal {
 350                         get {
 351                                 return Internal.threadpool_thread;
 352                         }
 353                         set {
 354                                 Internal.threadpool_thread = value;
 355                         }
 356                 }
 357
 358                 public bool IsAlive {
 359                         get {
 360                                 ThreadState curstate = GetState (Internal);
 361
 362                                 if((curstate & ThreadState.Aborted) != 0 ||
 363                                    (curstate & ThreadState.Stopped) != 0 ||
 364                                    (curstate & ThreadState.Unstarted) != 0) {
 365                                         return(false);
 366                                 } else {
 367                                         return(true);
 368                                 }
 369                         }
 370                 }
 371
 372                 public bool IsBackground {
 373                         get {
 374                                 ThreadState thread_state = GetState (Internal);
 375                                 if ((thread_state & ThreadState.Stopped) != 0)
 376                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 377
 378                                 return (thread_state & ThreadState.Background) != 0;
 379                         }
 380
 381                         set {
 382                                 if (value) {
 383                                         SetState (Internal, ThreadState.Background);
 384                                 } else {
 385                                         ClrState (Internal, ThreadState.Background);
 386                                 }
 387                         }
 388                 }
 389
 390                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 391                 private extern static string GetName_internal (InternalThread thread);
 392
 393                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 394                 private extern static void SetName_internal (InternalThread thread, String name);
 395
 396                 /*
 397                  * The thread name must be shared by appdomains, so it is stored in
 398                  * unmanaged code.
 399                  */
 400
 401                 public string Name {
 402                         get {
 403                                 return GetName_internal (Internal);
 404                         }
 405
 406                         set {
 407                                 SetName_internal (Internal, value);
 408                         }
 409                 }
 410
 411                 public ThreadState ThreadState {
 412                         get {
 413                                 return GetState (Internal);
 414                         }
 415                 }
 416
 417 #if MONO_FEATURE_THREAD_ABORT
 418                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 419                 private extern static void Abort_internal (InternalThread thread, object stateInfo);
 420
 421                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 422                 public void Abort ()
 423                 {
 424                         Abort_internal (Internal, null);
 425                 }
 426
 427                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 428                 public void Abort (object stateInfo)
 429                 {
 430                         Abort_internal (Internal, stateInfo);
 431                 }
 432
 433                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 434                 extern object GetAbortExceptionState ();
 435
 436                 internal object AbortReason {
 437                         get {
 438                                 return GetAbortExceptionState ();
 439                         }
 440                 }
 441
 442                 void ClearAbortReason ()
 443                 {
 444                 }
 445 #else
 446                 [Obsolete ("Thread.Abort is not supported on the current platform.", true)]
 447                 public void Abort ()
 448                 {
 449                         throw new PlatformNotSupportedException ("Thread.Abort is not supported on the current platform.");
 450                 }
 451
 452                 [Obsolete ("Thread.Abort is not supported on the current platform.", true)]
 453                 public void Abort (object stateInfo)
 454                 {
 455                         throw new PlatformNotSupportedException ("Thread.Abort is not supported on the current platform.");
 456                 }
 457
 458                 [Obsolete ("Thread.ResetAbort is not supported on the current platform.", true)]
 459                 public static void ResetAbort ()
 460                 {
 461                         throw new PlatformNotSupportedException ("Thread.ResetAbort is not supported on the current platform.");
 462                 }
 463
 464                 internal object AbortReason {
 465                         get {
 466                                 throw new PlatformNotSupportedException ("Thread.ResetAbort is not supported on the current platform.");
 467                         }
 468                 }
 469 #endif // MONO_FEATURE_THREAD_ABORT
 470
 471                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 472                 private extern static void SpinWait_nop ();
 473
 474
 475                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 476                 public static void SpinWait (int iterations)
 477                 {
 478                         if (iterations < 0)
 479                                 return;
 480                         while (iterations-- > 0)
 481                         {
 482                                 SpinWait_nop ();
 483                         }
 484                 }
 485
 486                 void StartInternal (IPrincipal principal, ref StackCrawlMark stackMark)
 487                 {
 488 #if FEATURE_ROLE_BASED_SECURITY
 489                         Internal._serialized_principal = CurrentThread.Internal._serialized_principal;
 490 #endif
 491
 492                         // Thread_internal creates and starts the new thread,
 493                         if (Thread_internal(m_Delegate) == IntPtr.Zero)
 494                                 throw new SystemException ("Thread creation failed.");
 495
 496                         m_ThreadStartArg = null;
 497                 }
 498
 499                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 500                 extern private static void SetState (InternalThread thread, ThreadState set);
 501
 502                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 503                 extern private static void ClrState (InternalThread thread, ThreadState clr);
 504
 505                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 506                 extern private static ThreadState GetState (InternalThread thread);
 507
 508                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 509                 extern public static byte VolatileRead (ref byte address);
 510
 511                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 512                 extern public static double VolatileRead (ref double address);
 513
 514                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 515                 extern public static short VolatileRead (ref short address);
 516
 517                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 518                 extern public static int VolatileRead (ref int address);
 519
 520                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 521                 extern public static long VolatileRead (ref long address);
 522
 523                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 524                 extern public static IntPtr VolatileRead (ref IntPtr address);
 525
 526                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 527                 extern public static object VolatileRead (ref object address);
 528
 529                 [CLSCompliant(false)]
 530                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 531                 extern public static sbyte VolatileRead (ref sbyte address);
 532
 533                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 534                 extern public static float VolatileRead (ref float address);
 535
 536                 [CLSCompliant (false)]
 537                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 538                 extern public static ushort VolatileRead (ref ushort address);
 539
 540                 [CLSCompliant (false)]
 541                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 542                 extern public static uint VolatileRead (ref uint address);
 543
 544                 [CLSCompliant (false)]
 545                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 546                 extern public static ulong VolatileRead (ref ulong address);
 547
 548                 [CLSCompliant (false)]
 549                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 550                 extern public static UIntPtr VolatileRead (ref UIntPtr address);
 551
 552                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 553                 extern public static void VolatileWrite (ref byte address, byte value);
 554
 555                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 556                 extern public static void VolatileWrite (ref double address, double value);
 557
 558                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 559                 extern public static void VolatileWrite (ref short address, short value);
 560
 561                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 562                 extern public static void VolatileWrite (ref int address, int value);
 563
 564                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 565                 extern public static void VolatileWrite (ref long address, long value);
 566
 567                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 568                 extern public static void VolatileWrite (ref IntPtr address, IntPtr value);
 569
 570                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 571                 extern public static void VolatileWrite (ref object address, object value);
 572
 573                 [CLSCompliant(false)]
 574                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 575                 extern public static void VolatileWrite (ref sbyte address, sbyte value);
 576
 577                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 578                 extern public static void VolatileWrite (ref float address, float value);
 579
 580                 [CLSCompliant (false)]
 581                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 582                 extern public static void VolatileWrite (ref ushort address, ushort value);
 583
 584                 [CLSCompliant (false)]
 585                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 586                 extern public static void VolatileWrite (ref uint address, uint value);
 587
 588                 [CLSCompliant (false)]
 589                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 590                 extern public static void VolatileWrite (ref ulong address, ulong value);
 591
 592                 [CLSCompliant (false)]
 593                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 594                 extern public static void VolatileWrite (ref UIntPtr address, UIntPtr value);
 595
 596                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 597                 extern static int SystemMaxStackStize ();
 598
 599                 static int GetProcessDefaultStackSize (int maxStackSize)
 600                 {
 601                         if (maxStackSize == 0)
 602                                 return 0;
 603
 604                         if (maxStackSize < 131072) // make sure stack is at least 128k big
 605                                 return 131072;
 606
 607                         int page_size = Environment.GetPageSize ();
 608
 609                         if ((maxStackSize % page_size) != 0) // round up to a divisible of page size
 610                                 maxStackSize = (maxStackSize / (page_size - 1)) * page_size;
 611
 612                         /* Respect the max stack size imposed by the system*/
 613                         return Math.Min (maxStackSize, SystemMaxStackStize ());
 614                 }
 615
 616                 void SetStart (MulticastDelegate start, int maxStackSize)
 617                 {
 618                         m_Delegate = start;
 619                         Internal.stack_size = maxStackSize;
 620                 }
 621
 622                 public int ManagedThreadId {
 623                         [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 624                         get {
 625                                 return Internal.managed_id;
 626                         }
 627                 }
 628
 629                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 630                 public static void BeginCriticalRegion ()
 631                 {
 632                         CurrentThread.Internal.critical_region_level++;
 633                 }
 634
 635                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 636                 public static void EndCriticalRegion ()
 637                 {
 638                         CurrentThread.Internal.critical_region_level--;
 639                 }
 640
 641                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 642                 public static void BeginThreadAffinity ()
 643                 {
 644                         // Managed and native threads are currently bound together.
 645                 }
 646
 647                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 648                 public static void EndThreadAffinity ()
 649                 {
 650                         // Managed and native threads are currently bound together.
 651                 }
 652
 653                 public ApartmentState GetApartmentState ()
 654                 {
 655                         return (ApartmentState)Internal.apartment_state;
 656                 }
 657
 658                 public void SetApartmentState (ApartmentState state)
 659                 {
 660                         if (!TrySetApartmentState (state))
 661                                 throw new InvalidOperationException ("Failed to set the specified COM apartment state.");
 662                 }
 663
 664                 public bool TrySetApartmentState (ApartmentState state)
 665                 {
 666                         if ((ThreadState & ThreadState.Unstarted) == 0)
 667                                 throw new ThreadStateException ("Thread was in an invalid state for the operation being executed.");
 668
 669                         if ((ApartmentState)Internal.apartment_state != ApartmentState.Unknown &&
 670                             (ApartmentState)Internal.apartment_state != state)
 671                                 return false;
 672
 673                         Internal.apartment_state = (byte)state;
 674
 675                         return true;
 676                 }
 677
 678                 [ComVisible (false)]
 679                 public override int GetHashCode ()
 680                 {
 681                         return ManagedThreadId;
 682                 }
 683
 684                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 685                 internal static extern void GetStackTraces (out Thread[] threads, out object[] stack_frames);
 686
 687                 // This is a mono extension to gather the stack traces for all running threads
 688                 internal static Dictionary<Thread, StackTrace> Mono_GetStackTraces () {
 689                         Thread[] threads;
 690                         object[] stack_frames;
 691
 692                         GetStackTraces (out threads, out stack_frames);
 693
 694                         var res = new Dictionary<Thread, StackTrace> ();
 695                         for (int i = 0; i < threads.Length; ++i)
 696                                 res [threads [i]] = new StackTrace ((StackFrame[])stack_frames [i]);
 697                         return res;
 698                 }
 699
 700 #if !MONO_FEATURE_THREAD_SUSPEND_RESUME
 701                 [Obsolete ("Thread.Suspend is not supported on the current platform.", true)]
 702                 public void Suspend ()
 703                 {
 704                         throw new PlatformNotSupportedException ("Thread.Suspend is not supported on the current platform.");
 705                 }
 706
 707                 [Obsolete ("Thread.Resume is not supported on the current platform.", true)]
 708                 public void Resume ()
 709                 {
 710                         throw new PlatformNotSupportedException ("Thread.Resume is not supported on the current platform.");
 711                 }
 712 #endif
 713
 714                 public void DisableComObjectEagerCleanup ()
 715                 {
 716                         throw new PlatformNotSupportedException ();
 717                 }
 718         }
 719 }