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                 IntPtr handle;
  53                 IntPtr native_handle; // used only on Win32
  54
  55                 /* Note this is an opaque object (an array), not a CultureInfo */
  56                 private object cached_culture_info;
  57                 /* accessed only from unmanaged code */
  58                 private IntPtr name;
  59                 private int name_len;
  60                 private ThreadState state;
  61                 private object abort_exc;
  62                 private int abort_state_handle;
  63                 /* thread_id is only accessed from unmanaged code */
  64                 internal Int64 thread_id;
  65
  66                 /* start_notify is used by the runtime to signal that Start()
  67                  * is ok to return
  68                  */
  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 abort_protected_block_count;
  94                 private int priority = (int) ThreadPriority.Normal;
  95                 private IntPtr owned_mutex;
  96                 /*
  97                  * These fields are used to avoid having to increment corlib versions
  98                  * when a new field is added to the unmanaged MonoThread structure.
  99                  */
 100                 private IntPtr unused1;
 101                 private IntPtr unused2;
 102
 103                 /* This is used only to check that we are in sync between the representation
 104                  * of MonoInternalThread in native and InternalThread in managed
 105                  *
 106                  * DO NOT RENAME! DO NOT ADD FIELDS AFTER! */
 107                 private IntPtr last;
 108                 #endregion
 109 #pragma warning restore 169, 414, 649
 110
 111                 // Closes the system thread handle
 112                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 113                 private extern void Thread_free_internal();
 114
 115                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 116                 ~InternalThread() {
 117                         Thread_free_internal();
 118                 }
 119         }
 120
 121         [StructLayout (LayoutKind.Sequential)]
 122         public sealed partial class Thread {
 123 #pragma warning disable 414
 124                 #region Sync with metadata/object-internals.h
 125                 private InternalThread internal_thread;
 126                 object m_ThreadStartArg;
 127                 object pending_exception;
 128                 #endregion
 129 #pragma warning restore 414
 130
 131                 IPrincipal principal;
 132                 int principal_version;
 133
 134                 // the name of current_thread is
 135                 // important because they are used by the runtime.
 136
 137                 [ThreadStatic]
 138                 static Thread current_thread;
 139
 140                 // can be both a ThreadStart and a ParameterizedThreadStart
 141                 private MulticastDelegate m_Delegate;
 142
 143                 private ExecutionContext m_ExecutionContext;    // this call context follows the logical thread
 144
 145                 private bool m_ExecutionContextBelongsToOuterScope;
 146
 147                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 148                 private extern void ConstructInternalThread ();
 149
 150                 private InternalThread Internal {
 151                         get {
 152                                 if (internal_thread == null)
 153                                         ConstructInternalThread ();
 154                                 return internal_thread;
 155                         }
 156                 }
 157
 158                 public static Context CurrentContext {
 159                         [SecurityPermission (SecurityAction.LinkDemand, Infrastructure=true)]
 160                         get {
 161                                 return(AppDomain.InternalGetContext ());
 162                         }
 163                 }
 164
 165                 /*
 166                  * These two methods return an array in the target
 167                  * domain with the same content as the argument.  If
 168                  * the argument is already in the target domain, then
 169                  * the argument is returned, otherwise a copy.
 170                  */
 171                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 172                 private extern static byte[] ByteArrayToRootDomain (byte[] arr);
 173
 174                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 175                 private extern static byte[] ByteArrayToCurrentDomain (byte[] arr);
 176
 177                 static void DeserializePrincipal (Thread th)
 178                 {
 179                         MemoryStream ms = new MemoryStream (ByteArrayToCurrentDomain (th.Internal._serialized_principal));
 180                         int type = ms.ReadByte ();
 181                         if (type == 0) {
 182                                 BinaryFormatter bf = new BinaryFormatter ();
 183                                 th.principal = (IPrincipal) bf.Deserialize (ms);
 184                                 th.principal_version = th.Internal._serialized_principal_version;
 185                         } else if (type == 1) {
 186                                 BinaryReader reader = new BinaryReader (ms);
 187                                 string name = reader.ReadString ();
 188                                 string auth_type = reader.ReadString ();
 189                                 int n_roles = reader.ReadInt32 ();
 190                                 string [] roles = null;
 191                                 if (n_roles >= 0) {
 192                                         roles = new string [n_roles];
 193                                         for (int i = 0; i < n_roles; i++)
 194                                                 roles [i] = reader.ReadString ();
 195                                 }
 196                                 th.principal = new GenericPrincipal (new GenericIdentity (name, auth_type), roles);
 197                         } else if (type == 2 || type == 3) {
 198                                 string [] roles = type == 2 ? null : new string [0];
 199                                 th.principal = new GenericPrincipal (new GenericIdentity ("", ""), roles);
 200                         }
 201                 }
 202
 203                 static void SerializePrincipal (Thread th, IPrincipal value)
 204                 {
 205                         MemoryStream ms = new MemoryStream ();
 206                         bool done = false;
 207                         if (value.GetType () == typeof (GenericPrincipal)) {
 208                                 GenericPrincipal gp = (GenericPrincipal) value;
 209                                 if (gp.Identity != null && gp.Identity.GetType () == typeof (GenericIdentity)) {
 210                                         GenericIdentity id = (GenericIdentity) gp.Identity;
 211                                         if (id.Name == "" && id.AuthenticationType == "") {
 212                                                 if (gp.Roles == null) {
 213                                                         ms.WriteByte (2);
 214                                                         done = true;
 215                                                 } else if (gp.Roles.Length == 0) {
 216                                                         ms.WriteByte (3);
 217                                                         done = true;
 218                                                 }
 219                                         } else {
 220                                                 ms.WriteByte (1);
 221                                                 BinaryWriter br = new BinaryWriter (ms);
 222                                                 br.Write (gp.Identity.Name);
 223                                                 br.Write (gp.Identity.AuthenticationType);
 224                                                 string [] roles = gp.Roles;
 225                                                 if  (roles == null) {
 226                                                         br.Write ((int) (-1));
 227                                                 } else {
 228                                                         br.Write (roles.Length);
 229                                                         foreach (string s in roles) {
 230                                                                 br.Write (s);
 231                                                         }
 232                                                 }
 233                                                 br.Flush ();
 234                                                 done = true;
 235                                         }
 236                                 }
 237                         }
 238                         if (!done) {
 239                                 ms.WriteByte (0);
 240                                 BinaryFormatter bf = new BinaryFormatter ();
 241                                 try {
 242                                         bf.Serialize (ms, value);
 243                                 } catch {}
 244                         }
 245                         th.Internal._serialized_principal = ByteArrayToRootDomain (ms.ToArray ());
 246                 }
 247
 248                 public static IPrincipal CurrentPrincipal {
 249                         get {
 250                                 Thread th = CurrentThread;
 251
 252                                 if (th.principal_version != th.Internal._serialized_principal_version)
 253                                         th.principal = null;
 254
 255                                 if (th.principal != null)
 256                                         return th.principal;
 257
 258                                 if (th.Internal._serialized_principal != null) {
 259                                         try {
 260                                                 DeserializePrincipal (th);
 261                                                 return th.principal;
 262                                         } catch {}
 263                                 }
 264
 265                                 th.principal = GetDomain ().DefaultPrincipal;
 266                                 th.principal_version = th.Internal._serialized_principal_version;
 267                                 return th.principal;
 268                         }
 269                         [SecurityPermission (SecurityAction.Demand, ControlPrincipal = true)]
 270                         set {
 271                                 Thread th = CurrentThread;
 272
 273                                 if (value != GetDomain ().DefaultPrincipal) {
 274                                         ++th.Internal._serialized_principal_version;
 275                                         try {
 276                                                 SerializePrincipal (th, value);
 277                                         } catch (Exception) {
 278                                                 th.Internal._serialized_principal = null;
 279                                         }
 280                                         th.principal_version = th.Internal._serialized_principal_version;
 281                                 } else {
 282                                         th.Internal._serialized_principal = null;
 283                                 }
 284
 285                                 th.principal = value;
 286                         }
 287                 }
 288
 289                 // Looks up the object associated with the current thread
 290                 // this is called by the JIT directly, too
 291                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 292                 private extern static InternalThread CurrentInternalThread_internal();
 293
 294                 public static Thread CurrentThread {
 295                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 296                         get {
 297                                 if (current_thread == null)
 298                                         current_thread = new Thread (CurrentInternalThread_internal ());
 299                                 return current_thread;
 300                         }
 301                 }
 302
 303                 internal static int CurrentThreadId {
 304                         get {
 305                                 return (int)(CurrentThread.internal_thread.thread_id);
 306                         }
 307                 }
 308
 309                 public static AppDomain GetDomain() {
 310                         return AppDomain.CurrentDomain;
 311                 }
 312
 313                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 314                 public extern static int GetDomainID();
 315
 316                 // Returns the system thread handle
 317                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 318                 private extern IntPtr Thread_internal (MulticastDelegate start);
 319
 320                 private Thread (InternalThread it) {
 321                         internal_thread = it;
 322                 }
 323
 324                 // part of ".NETPortable,Version=v4.0,Profile=Profile3" i.e. FX4 and SL4
 325                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 326                 ~Thread ()
 327                 {
 328                 }
 329
 330                 [Obsolete ("Deprecated in favor of GetApartmentState, SetApartmentState and TrySetApartmentState.")]
 331                 public ApartmentState ApartmentState {
 332                         get {
 333                                 if ((ThreadState & ThreadState.Stopped) != 0)
 334                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 335
 336                                 return (ApartmentState)Internal.apartment_state;
 337                         }
 338
 339                         set {
 340                                 TrySetApartmentState (value);
 341                         }
 342                 }
 343
 344                 public bool IsThreadPoolThread {
 345                         get {
 346                                 return IsThreadPoolThreadInternal;
 347                         }
 348                 }
 349
 350                 internal bool IsThreadPoolThreadInternal {
 351                         get {
 352                                 return Internal.threadpool_thread;
 353                         }
 354                         set {
 355                                 Internal.threadpool_thread = value;
 356                         }
 357                 }
 358
 359                 public bool IsAlive {
 360                         get {
 361                                 ThreadState curstate = GetState (Internal);
 362
 363                                 if((curstate & ThreadState.Aborted) != 0 ||
 364                                    (curstate & ThreadState.Stopped) != 0 ||
 365                                    (curstate & ThreadState.Unstarted) != 0) {
 366                                         return(false);
 367                                 } else {
 368                                         return(true);
 369                                 }
 370                         }
 371                 }
 372
 373                 public bool IsBackground {
 374                         get {
 375                                 ThreadState thread_state = GetState (Internal);
 376                                 if ((thread_state & ThreadState.Stopped) != 0)
 377                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 378
 379                                 return (thread_state & ThreadState.Background) != 0;
 380                         }
 381
 382                         set {
 383                                 if (value) {
 384                                         SetState (Internal, ThreadState.Background);
 385                                 } else {
 386                                         ClrState (Internal, ThreadState.Background);
 387                                 }
 388                         }
 389                 }
 390
 391                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 392                 private extern static string GetName_internal (InternalThread thread);
 393
 394                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 395                 private extern static void SetName_internal (InternalThread thread, String name);
 396
 397                 /*
 398                  * The thread name must be shared by appdomains, so it is stored in
 399                  * unmanaged code.
 400                  */
 401
 402                 public string Name {
 403                         get {
 404                                 return GetName_internal (Internal);
 405                         }
 406
 407                         set {
 408                                 SetName_internal (Internal, value);
 409                         }
 410                 }
 411
 412                 public ThreadState ThreadState {
 413                         get {
 414                                 return GetState (Internal);
 415                         }
 416                 }
 417
 418 #if MONO_FEATURE_THREAD_ABORT
 419                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 420                 private extern static void Abort_internal (InternalThread thread, object stateInfo);
 421
 422                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 423                 public void Abort ()
 424                 {
 425                         Abort_internal (Internal, null);
 426                 }
 427
 428                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 429                 public void Abort (object stateInfo)
 430                 {
 431                         Abort_internal (Internal, stateInfo);
 432                 }
 433
 434                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 435                 extern object GetAbortExceptionState ();
 436
 437                 internal object AbortReason {
 438                         get {
 439                                 return GetAbortExceptionState ();
 440                         }
 441                 }
 442
 443                 void ClearAbortReason ()
 444                 {
 445                 }
 446 #else
 447                 [Obsolete ("Thread.Abort is not supported on the current platform.", true)]
 448                 public void Abort ()
 449                 {
 450                         throw new PlatformNotSupportedException ("Thread.Abort is not supported on the current platform.");
 451                 }
 452
 453                 [Obsolete ("Thread.Abort is not supported on the current platform.", true)]
 454                 public void Abort (object stateInfo)
 455                 {
 456                         throw new PlatformNotSupportedException ("Thread.Abort is not supported on the current platform.");
 457                 }
 458
 459                 [Obsolete ("Thread.ResetAbort is not supported on the current platform.", true)]
 460                 public static void ResetAbort ()
 461                 {
 462                         throw new PlatformNotSupportedException ("Thread.ResetAbort is not supported on the current platform.");
 463                 }
 464
 465                 internal object AbortReason {
 466                         get {
 467                                 throw new PlatformNotSupportedException ("Thread.ResetAbort is not supported on the current platform.");
 468                         }
 469                 }
 470 #endif // MONO_FEATURE_THREAD_ABORT
 471
 472                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 473                 private extern static void SpinWait_nop ();
 474
 475
 476                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 477                 public static void SpinWait (int iterations)
 478                 {
 479                         if (iterations < 0)
 480                                 return;
 481                         while (iterations-- > 0)
 482                         {
 483                                 SpinWait_nop ();
 484                         }
 485                 }
 486
 487                 void StartInternal (IPrincipal principal, ref StackCrawlMark stackMark)
 488                 {
 489 #if FEATURE_ROLE_BASED_SECURITY
 490                         Internal._serialized_principal = CurrentThread.Internal._serialized_principal;
 491 #endif
 492
 493                         // Thread_internal creates and starts the new thread,
 494                         if (Thread_internal(m_Delegate) == IntPtr.Zero)
 495                                 throw new SystemException ("Thread creation failed.");
 496
 497                         m_ThreadStartArg = null;
 498                 }
 499
 500                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 501                 extern private static void SetState (InternalThread thread, ThreadState set);
 502
 503                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 504                 extern private static void ClrState (InternalThread thread, ThreadState clr);
 505
 506                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 507                 extern private static ThreadState GetState (InternalThread thread);
 508
 509                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 510                 extern public static byte VolatileRead (ref byte address);
 511
 512                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 513                 extern public static double VolatileRead (ref double address);
 514
 515                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 516                 extern public static short VolatileRead (ref short address);
 517
 518                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 519                 extern public static int VolatileRead (ref int address);
 520
 521                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 522                 extern public static long VolatileRead (ref long address);
 523
 524                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 525                 extern public static IntPtr VolatileRead (ref IntPtr address);
 526
 527                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 528                 extern public static object VolatileRead (ref object address);
 529
 530                 [CLSCompliant(false)]
 531                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 532                 extern public static sbyte VolatileRead (ref sbyte address);
 533
 534                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 535                 extern public static float VolatileRead (ref float address);
 536
 537                 [CLSCompliant (false)]
 538                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 539                 extern public static ushort VolatileRead (ref ushort address);
 540
 541                 [CLSCompliant (false)]
 542                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 543                 extern public static uint VolatileRead (ref uint address);
 544
 545                 [CLSCompliant (false)]
 546                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 547                 extern public static ulong VolatileRead (ref ulong address);
 548
 549                 [CLSCompliant (false)]
 550                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 551                 extern public static UIntPtr VolatileRead (ref UIntPtr address);
 552
 553                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 554                 extern public static void VolatileWrite (ref byte address, byte value);
 555
 556                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 557                 extern public static void VolatileWrite (ref double address, double value);
 558
 559                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 560                 extern public static void VolatileWrite (ref short address, short value);
 561
 562                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 563                 extern public static void VolatileWrite (ref int address, int value);
 564
 565                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 566                 extern public static void VolatileWrite (ref long address, long value);
 567
 568                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 569                 extern public static void VolatileWrite (ref IntPtr address, IntPtr value);
 570
 571                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 572                 extern public static void VolatileWrite (ref object address, object value);
 573
 574                 [CLSCompliant(false)]
 575                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 576                 extern public static void VolatileWrite (ref sbyte address, sbyte value);
 577
 578                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 579                 extern public static void VolatileWrite (ref float address, float value);
 580
 581                 [CLSCompliant (false)]
 582                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 583                 extern public static void VolatileWrite (ref ushort address, ushort value);
 584
 585                 [CLSCompliant (false)]
 586                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 587                 extern public static void VolatileWrite (ref uint address, uint value);
 588
 589                 [CLSCompliant (false)]
 590                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 591                 extern public static void VolatileWrite (ref ulong address, ulong value);
 592
 593                 [CLSCompliant (false)]
 594                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 595                 extern public static void VolatileWrite (ref UIntPtr address, UIntPtr value);
 596
 597                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 598                 extern static int SystemMaxStackStize ();
 599
 600                 static int GetProcessDefaultStackSize (int maxStackSize)
 601                 {
 602                         if (maxStackSize == 0)
 603                                 return 0;
 604
 605                         if (maxStackSize < 131072) // make sure stack is at least 128k big
 606                                 return 131072;
 607
 608                         int page_size = Environment.GetPageSize ();
 609
 610                         if ((maxStackSize % page_size) != 0) // round up to a divisible of page size
 611                                 maxStackSize = (maxStackSize / (page_size - 1)) * page_size;
 612
 613                         /* Respect the max stack size imposed by the system*/
 614                         return Math.Min (maxStackSize, SystemMaxStackStize ());
 615                 }
 616
 617                 void SetStart (MulticastDelegate start, int maxStackSize)
 618                 {
 619                         m_Delegate = start;
 620                         Internal.stack_size = maxStackSize;
 621                 }
 622
 623                 public int ManagedThreadId {
 624                         [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 625                         get {
 626                                 return Internal.managed_id;
 627                         }
 628                 }
 629
 630                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 631                 public static void BeginCriticalRegion ()
 632                 {
 633                         CurrentThread.Internal.critical_region_level++;
 634                 }
 635
 636                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 637                 public static void EndCriticalRegion ()
 638                 {
 639                         CurrentThread.Internal.critical_region_level--;
 640                 }
 641
 642                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 643                 public static void BeginThreadAffinity ()
 644                 {
 645                         // Managed and native threads are currently bound together.
 646                 }
 647
 648                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 649                 public static void EndThreadAffinity ()
 650                 {
 651                         // Managed and native threads are currently bound together.
 652                 }
 653
 654                 public ApartmentState GetApartmentState ()
 655                 {
 656                         return (ApartmentState)Internal.apartment_state;
 657                 }
 658
 659                 public void SetApartmentState (ApartmentState state)
 660                 {
 661                         if (!TrySetApartmentState (state))
 662                                 throw new InvalidOperationException ("Failed to set the specified COM apartment state.");
 663                 }
 664
 665                 public bool TrySetApartmentState (ApartmentState state)
 666                 {
 667                         if ((ThreadState & ThreadState.Unstarted) == 0)
 668                                 throw new ThreadStateException ("Thread was in an invalid state for the operation being executed.");
 669
 670                         if ((ApartmentState)Internal.apartment_state != ApartmentState.Unknown &&
 671                             (ApartmentState)Internal.apartment_state != state)
 672                                 return false;
 673
 674                         Internal.apartment_state = (byte)state;
 675
 676                         return true;
 677                 }
 678
 679                 [ComVisible (false)]
 680                 public override int GetHashCode ()
 681                 {
 682                         return ManagedThreadId;
 683                 }
 684
 685                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 686                 internal static extern void GetStackTraces (out Thread[] threads, out object[] stack_frames);
 687
 688                 // This is a mono extension to gather the stack traces for all running threads
 689                 internal static Dictionary<Thread, StackTrace> Mono_GetStackTraces () {
 690                         Thread[] threads;
 691                         object[] stack_frames;
 692
 693                         GetStackTraces (out threads, out stack_frames);
 694
 695                         var res = new Dictionary<Thread, StackTrace> ();
 696                         for (int i = 0; i < threads.Length; ++i)
 697                                 res [threads [i]] = new StackTrace ((StackFrame[])stack_frames [i]);
 698                         return res;
 699                 }
 700
 701 #if !MONO_FEATURE_THREAD_SUSPEND_RESUME
 702                 [Obsolete ("Thread.Suspend is not supported on the current platform.", true)]
 703                 public void Suspend ()
 704                 {
 705                         throw new PlatformNotSupportedException ("Thread.Suspend is not supported on the current platform.");
 706                 }
 707
 708                 [Obsolete ("Thread.Resume is not supported on the current platform.", true)]
 709                 public void Resume ()
 710                 {
 711                         throw new PlatformNotSupportedException ("Thread.Resume is not supported on the current platform.");
 712                 }
 713 #endif
 714
 715                 public void DisableComObjectEagerCleanup ()
 716                 {
 717                         throw new PlatformNotSupportedException ();
 718                 }
 719         }
 720 }