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.Runtime.ConstrainedExecution;
  43
  44 namespace System.Threading {
  45         [StructLayout (LayoutKind.Sequential)]
  46         sealed class InternalThread : CriticalFinalizerObject {
  47 #pragma warning disable 169, 414, 649
  48                 #region Sync with metadata/object-internals.h
  49                 int lock_thread_id;
  50                 // stores a thread handle
  51                 internal IntPtr system_thread_handle;
  52
  53                 /* Note this is an opaque object (an array), not a CultureInfo */
  54                 private object cached_culture_info;
  55                 /* accessed only from unmanaged code */
  56                 private IntPtr name;
  57                 private int name_len;
  58                 private ThreadState state;
  59                 private object abort_exc;
  60                 private int abort_state_handle;
  61                 /* thread_id is only accessed from unmanaged code */
  62                 internal Int64 thread_id;
  63
  64                 /* start_notify is used by the runtime to signal that Start()
  65                  * is ok to return
  66                  */
  67                 private IntPtr start_notify;
  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 pending_exception;
  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 async_invoke_method;
  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 unused1;
  99                 private IntPtr unused2;
 100                 #endregion
 101 #pragma warning restore 169, 414, 649
 102
 103                 // Closes the system thread handle
 104                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 105                 private extern void Thread_free_internal(IntPtr handle);
 106
 107                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 108                 ~InternalThread() {
 109                         Thread_free_internal(system_thread_handle);
 110                 }
 111         }
 112
 113         [StructLayout (LayoutKind.Sequential)]
 114         public sealed partial class Thread {
 115 #pragma warning disable 414
 116                 #region Sync with metadata/object-internals.h
 117                 private InternalThread internal_thread;
 118                 object m_ThreadStartArg;
 119                 private ExecutionContext ec_to_set;
 120                 #endregion
 121 #pragma warning restore 414
 122
 123                 IPrincipal principal;
 124                 int principal_version;
 125                 bool current_culture_set;
 126                 bool current_ui_culture_set;
 127                 CultureInfo current_culture;
 128                 CultureInfo current_ui_culture;
 129
 130                 // the name of local_slots, current_thread and _ec is
 131                 // important because they are used by the runtime.
 132                 [ThreadStatic]
 133                 static object[] local_slots;
 134
 135                 [ThreadStatic]
 136                 static Thread current_thread;
 137
 138                 /* The actual ExecutionContext of the thread.  It's
 139                    ThreadStatic so that it's not shared between
 140                    AppDomains. */
 141                 [ThreadStatic]
 142                 static ExecutionContext _ec;
 143
 144                 static internal CultureInfo default_culture;
 145                 static internal CultureInfo default_ui_culture;
 146
 147                 // can be both a ThreadStart and a ParameterizedThreadStart
 148                 private MulticastDelegate m_Delegate;
 149                 //private string thread_name=null;
 150
 151                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 152                 private extern void ConstructInternalThread ();
 153
 154                 private InternalThread Internal {
 155                         get {
 156                                 if (internal_thread == null)
 157                                         ConstructInternalThread ();
 158                                 return internal_thread;
 159                         }
 160                 }
 161
 162                 public static Context CurrentContext {
 163                         [SecurityPermission (SecurityAction.LinkDemand, Infrastructure=true)]
 164                         get {
 165                                 return(AppDomain.InternalGetContext ());
 166                         }
 167                 }
 168
 169                 /*
 170                  * These two methods return an array in the target
 171                  * domain with the same content as the argument.  If
 172                  * the argument is already in the target domain, then
 173                  * the argument is returned, otherwise a copy.
 174                  */
 175                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 176                 private extern static byte[] ByteArrayToRootDomain (byte[] arr);
 177
 178                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 179                 private extern static byte[] ByteArrayToCurrentDomain (byte[] arr);
 180
 181                 static void DeserializePrincipal (Thread th)
 182                 {
 183                         MemoryStream ms = new MemoryStream (ByteArrayToCurrentDomain (th.Internal._serialized_principal));
 184                         int type = ms.ReadByte ();
 185                         if (type == 0) {
 186                                 BinaryFormatter bf = new BinaryFormatter ();
 187                                 th.principal = (IPrincipal) bf.Deserialize (ms);
 188                                 th.principal_version = th.Internal._serialized_principal_version;
 189                         } else if (type == 1) {
 190                                 BinaryReader reader = new BinaryReader (ms);
 191                                 string name = reader.ReadString ();
 192                                 string auth_type = reader.ReadString ();
 193                                 int n_roles = reader.ReadInt32 ();
 194                                 string [] roles = null;
 195                                 if (n_roles >= 0) {
 196                                         roles = new string [n_roles];
 197                                         for (int i = 0; i < n_roles; i++)
 198                                                 roles [i] = reader.ReadString ();
 199                                 }
 200                                 th.principal = new GenericPrincipal (new GenericIdentity (name, auth_type), roles);
 201                         } else if (type == 2 || type == 3) {
 202                                 string [] roles = type == 2 ? null : new string [0];
 203                                 th.principal = new GenericPrincipal (new GenericIdentity ("", ""), roles);
 204                         }
 205                 }
 206
 207                 static void SerializePrincipal (Thread th, IPrincipal value)
 208                 {
 209                         MemoryStream ms = new MemoryStream ();
 210                         bool done = false;
 211                         if (value.GetType () == typeof (GenericPrincipal)) {
 212                                 GenericPrincipal gp = (GenericPrincipal) value;
 213                                 if (gp.Identity != null && gp.Identity.GetType () == typeof (GenericIdentity)) {
 214                                         GenericIdentity id = (GenericIdentity) gp.Identity;
 215                                         if (id.Name == "" && id.AuthenticationType == "") {
 216                                                 if (gp.Roles == null) {
 217                                                         ms.WriteByte (2);
 218                                                         done = true;
 219                                                 } else if (gp.Roles.Length == 0) {
 220                                                         ms.WriteByte (3);
 221                                                         done = true;
 222                                                 }
 223                                         } else {
 224                                                 ms.WriteByte (1);
 225                                                 BinaryWriter br = new BinaryWriter (ms);
 226                                                 br.Write (gp.Identity.Name);
 227                                                 br.Write (gp.Identity.AuthenticationType);
 228                                                 string [] roles = gp.Roles;
 229                                                 if  (roles == null) {
 230                                                         br.Write ((int) (-1));
 231                                                 } else {
 232                                                         br.Write (roles.Length);
 233                                                         foreach (string s in roles) {
 234                                                                 br.Write (s);
 235                                                         }
 236                                                 }
 237                                                 br.Flush ();
 238                                                 done = true;
 239                                         }
 240                                 }
 241                         }
 242                         if (!done) {
 243                                 ms.WriteByte (0);
 244                                 BinaryFormatter bf = new BinaryFormatter ();
 245                                 try {
 246                                         bf.Serialize (ms, value);
 247                                 } catch {}
 248                         }
 249                         th.Internal._serialized_principal = ByteArrayToRootDomain (ms.ToArray ());
 250                 }
 251
 252                 public static IPrincipal CurrentPrincipal {
 253                         get {
 254                                 Thread th = CurrentThread;
 255
 256                                 if (th.principal_version != th.Internal._serialized_principal_version)
 257                                         th.principal = null;
 258
 259                                 if (th.principal != null)
 260                                         return th.principal;
 261
 262                                 if (th.Internal._serialized_principal != null) {
 263                                         try {
 264                                                 DeserializePrincipal (th);
 265                                                 return th.principal;
 266                                         } catch {}
 267                                 }
 268
 269                                 th.principal = GetDomain ().DefaultPrincipal;
 270                                 th.principal_version = th.Internal._serialized_principal_version;
 271                                 return th.principal;
 272                         }
 273                         [SecurityPermission (SecurityAction.Demand, ControlPrincipal = true)]
 274                         set {
 275                                 Thread th = CurrentThread;
 276
 277                                 if (value != GetDomain ().DefaultPrincipal) {
 278                                         ++th.Internal._serialized_principal_version;
 279                                         try {
 280                                                 SerializePrincipal (th, value);
 281                                         } catch (Exception) {
 282                                                 th.Internal._serialized_principal = null;
 283                                         }
 284                                         th.principal_version = th.Internal._serialized_principal_version;
 285                                 } else {
 286                                         th.Internal._serialized_principal = null;
 287                                 }
 288
 289                                 th.principal = value;
 290                         }
 291                 }
 292
 293                 // Looks up the object associated with the current thread
 294                 // this is called by the JIT directly, too
 295                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 296                 private extern static InternalThread CurrentInternalThread_internal();
 297
 298                 public static Thread CurrentThread {
 299                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 300                         get {
 301                                 if (current_thread == null)
 302                                         current_thread = new Thread (CurrentInternalThread_internal ());
 303                                 return current_thread;
 304                         }
 305                 }
 306
 307                 internal static int CurrentThreadId {
 308                         get {
 309                                 return (int)(CurrentThread.internal_thread.thread_id);
 310                         }
 311                 }
 312
 313                 public static AppDomain GetDomain() {
 314                         return AppDomain.CurrentDomain;
 315                 }
 316
 317                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 318                 public extern static int GetDomainID();
 319
 320                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 321                 private extern static void ResetAbort_internal();
 322
 323                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 324                 public static void ResetAbort ()
 325                 {
 326                         ResetAbort_internal ();
 327                 }
 328
 329                 [HostProtectionAttribute (SecurityAction.LinkDemand, Synchronization = true, ExternalThreading = true)]
 330                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 331                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 332                 public extern static bool Yield ();
 333
 334
 335                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 336                 private extern static void Sleep_internal(int ms);
 337
 338                 public static void Sleep (int millisecondsTimeout)
 339                 {
 340                         if (millisecondsTimeout < Timeout.Infinite)
 341                                 throw new ArgumentOutOfRangeException ("millisecondsTimeout", "Negative timeout");
 342
 343                         Sleep_internal (millisecondsTimeout);
 344                 }
 345
 346                 public static void Sleep (TimeSpan timeout)
 347                 {
 348                         long ms = (long) timeout.TotalMilliseconds;
 349                         if (ms < Timeout.Infinite || ms > Int32.MaxValue)
 350                                 throw new ArgumentOutOfRangeException ("timeout", "timeout out of range");
 351
 352                         Sleep_internal ((int) ms);
 353                 }
 354
 355                 // Returns the system thread handle
 356                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 357                 private extern IntPtr Thread_internal (MulticastDelegate start);
 358
 359                 public Thread(ThreadStart start) {
 360                         if(start==null) {
 361                                 throw new ArgumentNullException("Null ThreadStart");
 362                         }
 363                         m_Delegate=start;
 364                 }
 365
 366                 private Thread (InternalThread it) {
 367                         internal_thread = it;
 368                 }
 369
 370                 // part of ".NETPortable,Version=v4.0,Profile=Profile3" i.e. FX4 and SL4
 371                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 372                 ~Thread ()
 373                 {
 374                 }
 375
 376                 [Obsolete ("Deprecated in favor of GetApartmentState, SetApartmentState and TrySetApartmentState.")]
 377                 public ApartmentState ApartmentState {
 378                         get {
 379                                 if ((ThreadState & ThreadState.Stopped) != 0)
 380                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 381
 382                                 return (ApartmentState)Internal.apartment_state;
 383                         }
 384
 385                         set {
 386                                 TrySetApartmentState (value);
 387                         }
 388                 }
 389
 390                 //[MethodImplAttribute (MethodImplOptions.InternalCall)]
 391                 //private static extern int current_lcid ();
 392
 393                 public CultureInfo CurrentCulture {
 394                         get {
 395                                 CultureInfo culture = current_culture;
 396                                 if (current_culture_set && culture != null)
 397                                         return culture;
 398
 399                                 if (default_culture != null)
 400                                         return default_culture;
 401
 402                                 current_culture = culture = CultureInfo.ConstructCurrentCulture ();
 403                                 return culture;
 404                         }
 405
 406                         [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 407                         set {
 408                                 if (value == null)
 409                                         throw new ArgumentNullException ("value");
 410
 411                                 value.CheckNeutral ();
 412                                 current_culture = value;
 413                                 current_culture_set = true;
 414                         }
 415                 }
 416
 417                 public CultureInfo CurrentUICulture {
 418                         get {
 419                                 CultureInfo culture = current_ui_culture;
 420                                 if (current_ui_culture_set && culture != null)
 421                                         return culture;
 422
 423                                 if (default_ui_culture != null)
 424                                         return default_ui_culture;
 425
 426                                 current_ui_culture = culture = CultureInfo.ConstructCurrentUICulture ();
 427                                 return culture;
 428                         }
 429
 430                         set {
 431                                 if (value == null)
 432                                         throw new ArgumentNullException ("value");
 433                                 current_ui_culture = value;
 434                                 current_ui_culture_set = true;
 435                         }
 436                 }
 437
 438                 public bool IsThreadPoolThread {
 439                         get {
 440                                 return IsThreadPoolThreadInternal;
 441                         }
 442                 }
 443
 444                 internal bool IsThreadPoolThreadInternal {
 445                         get {
 446                                 return Internal.threadpool_thread;
 447                         }
 448                         set {
 449                                 Internal.threadpool_thread = value;
 450                         }
 451                 }
 452
 453                 public bool IsAlive {
 454                         get {
 455                                 ThreadState curstate = GetState (Internal);
 456
 457                                 if((curstate & ThreadState.Aborted) != 0 ||
 458                                    (curstate & ThreadState.Stopped) != 0 ||
 459                                    (curstate & ThreadState.Unstarted) != 0) {
 460                                         return(false);
 461                                 } else {
 462                                         return(true);
 463                                 }
 464                         }
 465                 }
 466
 467                 public bool IsBackground {
 468                         get {
 469                                 ThreadState thread_state = GetState (Internal);
 470                                 if ((thread_state & ThreadState.Stopped) != 0)
 471                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 472
 473                                 return (thread_state & ThreadState.Background) != 0;
 474                         }
 475
 476                         set {
 477                                 if (value) {
 478                                         SetState (Internal, ThreadState.Background);
 479                                 } else {
 480                                         ClrState (Internal, ThreadState.Background);
 481                                 }
 482                         }
 483                 }
 484
 485                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 486                 private extern static string GetName_internal (InternalThread thread);
 487
 488                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 489                 private extern static void SetName_internal (InternalThread thread, String name);
 490
 491                 /*
 492                  * The thread name must be shared by appdomains, so it is stored in
 493                  * unmanaged code.
 494                  */
 495
 496                 public string Name {
 497                         get {
 498                                 return GetName_internal (Internal);
 499                         }
 500
 501                         set {
 502                                 SetName_internal (Internal, value);
 503                         }
 504                 }
 505
 506                 public ThreadPriority Priority {
 507                         get {
 508                                 return (ThreadPriority)GetPriority (Internal);
 509                         }
 510
 511                         set {
 512                                 // FIXME: This doesn't do anything yet
 513                                 SetPriority (Internal, (int)value);
 514                         }
 515                 }
 516
 517                 public ThreadState ThreadState {
 518                         get {
 519                                 return GetState (Internal);
 520                         }
 521                 }
 522
 523                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 524                 private extern static void Abort_internal (InternalThread thread, object stateInfo);
 525
 526                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 527                 private extern static int GetPriority (InternalThread thread);
 528
 529                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 530                 private extern static void SetPriority (InternalThread thread, int priority);
 531
 532                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 533                 public void Abort ()
 534                 {
 535                         Abort_internal (Internal, null);
 536                 }
 537
 538                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 539                 public void Abort (object stateInfo)
 540                 {
 541                         Abort_internal (Internal, stateInfo);
 542                 }
 543
 544                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 545                 extern object GetAbortExceptionState ();
 546
 547                 internal object AbortReason {
 548                         get {
 549                                 return GetAbortExceptionState ();
 550                         }
 551                 }
 552
 553                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 554                 private extern static void Interrupt_internal (InternalThread thread);
 555
 556                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 557                 public void Interrupt ()
 558                 {
 559                         Interrupt_internal (Internal);
 560                 }
 561
 562                 // The current thread joins with 'this'. Set ms to 0 to block
 563                 // until this actually exits.
 564                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 565                 private extern static bool Join_internal(InternalThread thread, int ms, IntPtr handle);
 566
 567                 public void Join()
 568                 {
 569                         Join_internal(Internal, Timeout.Infinite, Internal.system_thread_handle);
 570                 }
 571
 572                 public bool Join(int millisecondsTimeout)
 573                 {
 574                         if (millisecondsTimeout < Timeout.Infinite)
 575                                 throw new ArgumentOutOfRangeException ("millisecondsTimeout", "Timeout less than zero");
 576
 577                         return Join_internal (Internal, millisecondsTimeout, Internal.system_thread_handle);
 578                 }
 579
 580                 public bool Join(TimeSpan timeout)
 581                 {
 582                         long ms = (long) timeout.TotalMilliseconds;
 583                         if (ms < Timeout.Infinite || ms > Int32.MaxValue)
 584                                 throw new ArgumentOutOfRangeException ("timeout", "timeout out of range");
 585
 586                         return Join_internal (Internal, (int) ms, Internal.system_thread_handle);
 587                 }
 588
 589                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 590                 public extern static void MemoryBarrier ();
 591
 592                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 593                 private extern void Resume_internal();
 594
 595                 [Obsolete ("")]
 596                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 597                 public void Resume ()
 598                 {
 599                         Resume_internal ();
 600                 }
 601
 602                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 603                 private extern static void SpinWait_nop ();
 604
 605
 606                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 607                 public static void SpinWait (int iterations)
 608                 {
 609                         if (iterations < 0)
 610                                 return;
 611                         while (iterations-- > 0)
 612                         {
 613                                 SpinWait_nop ();
 614                         }
 615                 }
 616
 617                 private void StartInternal ()
 618                 {
 619                         current_thread = this;
 620
 621                         if (m_Delegate is ThreadStart) {
 622                                 ((ThreadStart) m_Delegate) ();
 623                         } else {
 624                                 ((ParameterizedThreadStart) m_Delegate) (m_ThreadStartArg);
 625                         }
 626                 }
 627
 628                 public void Start() {
 629                         // propagate informations from the original thread to the new thread
 630                         ec_to_set = ExecutionContext.Capture (false, true);
 631                         Internal._serialized_principal = CurrentThread.Internal._serialized_principal;
 632
 633                         // Thread_internal creates and starts the new thread,
 634                         if (Thread_internal((ThreadStart) StartInternal) == (IntPtr) 0)
 635                                 throw new SystemException ("Thread creation failed.");
 636                 }
 637
 638                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 639                 private extern static void Suspend_internal(InternalThread thread);
 640
 641                 [Obsolete ("")]
 642                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 643                 public void Suspend ()
 644                 {
 645                         Suspend_internal (Internal);
 646                 }
 647
 648                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 649                 extern private static void SetState (InternalThread thread, ThreadState set);
 650
 651                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 652                 extern private static void ClrState (InternalThread thread, ThreadState clr);
 653
 654                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 655                 extern private static ThreadState GetState (InternalThread thread);
 656
 657                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 658                 extern public static byte VolatileRead (ref byte address);
 659
 660                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 661                 extern public static double VolatileRead (ref double address);
 662
 663                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 664                 extern public static short VolatileRead (ref short address);
 665
 666                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 667                 extern public static int VolatileRead (ref int address);
 668
 669                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 670                 extern public static long VolatileRead (ref long address);
 671
 672                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 673                 extern public static IntPtr VolatileRead (ref IntPtr address);
 674
 675                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 676                 extern public static object VolatileRead (ref object address);
 677
 678                 [CLSCompliant(false)]
 679                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 680                 extern public static sbyte VolatileRead (ref sbyte address);
 681
 682                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 683                 extern public static float VolatileRead (ref float address);
 684
 685                 [CLSCompliant (false)]
 686                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 687                 extern public static ushort VolatileRead (ref ushort address);
 688
 689                 [CLSCompliant (false)]
 690                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 691                 extern public static uint VolatileRead (ref uint address);
 692
 693                 [CLSCompliant (false)]
 694                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 695                 extern public static ulong VolatileRead (ref ulong address);
 696
 697                 [CLSCompliant (false)]
 698                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 699                 extern public static UIntPtr VolatileRead (ref UIntPtr address);
 700
 701                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 702                 extern public static void VolatileWrite (ref byte address, byte value);
 703
 704                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 705                 extern public static void VolatileWrite (ref double address, double value);
 706
 707                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 708                 extern public static void VolatileWrite (ref short address, short value);
 709
 710                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 711                 extern public static void VolatileWrite (ref int address, int value);
 712
 713                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 714                 extern public static void VolatileWrite (ref long address, long value);
 715
 716                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 717                 extern public static void VolatileWrite (ref IntPtr address, IntPtr value);
 718
 719                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 720                 extern public static void VolatileWrite (ref object address, object value);
 721
 722                 [CLSCompliant(false)]
 723                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 724                 extern public static void VolatileWrite (ref sbyte address, sbyte value);
 725
 726                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 727                 extern public static void VolatileWrite (ref float address, float value);
 728
 729                 [CLSCompliant (false)]
 730                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 731                 extern public static void VolatileWrite (ref ushort address, ushort value);
 732
 733                 [CLSCompliant (false)]
 734                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 735                 extern public static void VolatileWrite (ref uint address, uint value);
 736
 737                 [CLSCompliant (false)]
 738                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 739                 extern public static void VolatileWrite (ref ulong address, ulong value);
 740
 741                 [CLSCompliant (false)]
 742                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 743                 extern public static void VolatileWrite (ref UIntPtr address, UIntPtr value);
 744
 745                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 746                 extern static int SystemMaxStackStize ();
 747
 748                 static int GetProcessDefaultStackSize (int maxStackSize)
 749                 {
 750                         if (maxStackSize < 131072) // make sure stack is at least 128k big
 751                                 return 131072;
 752
 753                         int page_size = Environment.GetPageSize ();
 754
 755                         if ((maxStackSize % page_size) != 0) // round up to a divisible of page size
 756                                 maxStackSize = (maxStackSize / (page_size - 1)) * page_size;
 757
 758                         /* Respect the max stack size imposed by the system*/
 759                         return Math.Min (maxStackSize, SystemMaxStackStize ());
 760                 }
 761
 762                 void SetStart (MulticastDelegate start, int maxStackSize)
 763                 {
 764                         m_Delegate = start;
 765                         Internal.stack_size = maxStackSize;
 766                 }
 767
 768                 public ExecutionContext ExecutionContext {
 769                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 770                         get {
 771                                 if (_ec == null)
 772                                         _ec = new ExecutionContext ();
 773                                 return _ec;
 774                         }
 775                         internal set {
 776                                 _ec = value;
 777                         }
 778                 }
 779
 780                 internal bool HasExecutionContext {
 781                         get {
 782                                 return _ec != null;
 783                         }
 784                 }
 785
 786                 public int ManagedThreadId {
 787                         [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 788                         get {
 789                                 return Internal.managed_id;
 790                         }
 791                 }
 792
 793                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 794                 public static void BeginCriticalRegion ()
 795                 {
 796                         CurrentThread.Internal.critical_region_level++;
 797                 }
 798
 799                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 800                 public static void EndCriticalRegion ()
 801                 {
 802                         CurrentThread.Internal.critical_region_level--;
 803                 }
 804
 805                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 806                 public static void BeginThreadAffinity ()
 807                 {
 808                         // Managed and native threads are currently bound together.
 809                 }
 810
 811                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
 812                 public static void EndThreadAffinity ()
 813                 {
 814                         // Managed and native threads are currently bound together.
 815                 }
 816
 817                 public ApartmentState GetApartmentState ()
 818                 {
 819                         return (ApartmentState)Internal.apartment_state;
 820                 }
 821
 822                 public void SetApartmentState (ApartmentState state)
 823                 {
 824                         if (!TrySetApartmentState (state))
 825                                 throw new InvalidOperationException ("Failed to set the specified COM apartment state.");
 826                 }
 827
 828                 public bool TrySetApartmentState (ApartmentState state)
 829                 {
 830                         if ((ThreadState & ThreadState.Unstarted) == 0)
 831                                 throw new ThreadStateException ("Thread was in an invalid state for the operation being executed.");
 832
 833                         if ((ApartmentState)Internal.apartment_state != ApartmentState.Unknown &&
 834                             (ApartmentState)Internal.apartment_state != state)
 835                                 return false;
 836
 837                         Internal.apartment_state = (byte)state;
 838
 839                         return true;
 840                 }
 841
 842                 [ComVisible (false)]
 843                 public override int GetHashCode ()
 844                 {
 845                         return ManagedThreadId;
 846                 }
 847
 848                 public void Start (object parameter)
 849                 {
 850                         m_ThreadStartArg = parameter;
 851                         Start ();
 852                 }
 853
 854                 internal CultureInfo GetCurrentUICultureNoAppX ()
 855                 {
 856                         return CultureInfo.CurrentUICulture;
 857                 }
 858         }
 859 }