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;
  40 using System.Reflection;
  41 using System.Security;
  42 using System.Runtime.ConstrainedExecution;
  43
  44 namespace System.Threading {
  45
  46         internal 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                 private IntPtr unused0;
  56                 internal bool threadpool_thread;
  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 start_notify;
  70                 private IntPtr stack_ptr;
  71                 private UIntPtr static_data; /* GC-tracked */
  72                 private IntPtr jit_data;
  73                 private IntPtr lock_data;
  74                 /* current System.Runtime.Remoting.Contexts.Context instance
  75                    keep as an object to avoid triggering its class constructor when not needed */
  76                 private object current_appcontext;
  77                 internal int stack_size;
  78                 private IntPtr appdomain_refs;
  79                 private int interruption_requested;
  80                 private IntPtr suspend_event;
  81                 private IntPtr suspended_event;
  82                 private IntPtr resume_event;
  83                 private IntPtr synch_cs;
  84                 private bool thread_dump_requested;
  85                 private IntPtr end_stack;
  86                 private bool thread_interrupt_requested;
  87                 internal byte apartment_state;
  88                 internal volatile int critical_region_level;
  89                 private int small_id;
  90                 private IntPtr manage_callback;
  91                 private object pending_exception;
  92                 /* This is the ExecutionContext that will be set by
  93                    start_wrapper() in the runtime. */
  94                 private ExecutionContext ec_to_set;
  95
  96                 private IntPtr interrupt_on_stop;
  97
  98                 /*
  99                  * These fields are used to avoid having to increment corlib versions
 100                  * when a new field is added to the unmanaged MonoThread structure.
 101                  */
 102                 private IntPtr unused3;
 103                 private IntPtr unused4;
 104                 private IntPtr unused5;
 105                 private IntPtr unused6;
 106                 #endregion
 107 #pragma warning restore 169, 414, 649
 108
 109                 internal int managed_id;
 110
 111                 internal byte[] _serialized_principal;
 112                 internal int _serialized_principal_version;
 113
 114                 internal byte[] serialized_culture_info;
 115                 internal byte[] serialized_ui_culture_info;
 116
 117                 /* If the current_lcid() isn't known by CultureInfo,
 118                  * it will throw an exception which may cause
 119                  * String.Concat to try and recursively look up the
 120                  * CurrentCulture, which will throw an exception, etc.
 121                  * Use a boolean to short-circuit this scenario.
 122                  */
 123                 internal bool in_currentculture=false;
 124
 125                 // Closes the system thread handle
 126                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 127                 private extern void Thread_free_internal(IntPtr handle);
 128
 129                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 130                 ~InternalThread() {
 131                         Thread_free_internal(system_thread_handle);
 132                 }
 133         }
 134
 135         [ClassInterface (ClassInterfaceType.None)]
 136         [ComVisible (true)]
 137         [ComDefaultInterface (typeof (_Thread))]
 138         public sealed class Thread : CriticalFinalizerObject, _Thread {
 139 #pragma warning disable 414
 140                 #region Sync with metadata/object-internals.h
 141                 private InternalThread internal_thread;
 142                 object start_obj;
 143                 private ExecutionContext ec_to_set;
 144                 #endregion
 145 #pragma warning restore 414
 146
 147                 IPrincipal principal;
 148                 int principal_version;
 149
 150                 // the name of local_slots, current_thread and _ec is
 151                 // important because they are used by the runtime.
 152                 [ThreadStatic]
 153                 static object[] local_slots;
 154
 155                 [ThreadStatic]
 156                 static Thread current_thread;
 157
 158                 /* The actual ExecutionContext of the thread.  It's
 159                    ThreadStatic so that it's not shared between
 160                    AppDomains. */
 161                 [ThreadStatic]
 162                 static ExecutionContext _ec;
 163
 164                 // can be both a ThreadStart and a ParameterizedThreadStart
 165                 private MulticastDelegate threadstart;
 166                 //private string thread_name=null;
 167
 168                 private static int _managed_id_counter;
 169
 170                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 171                 private extern void ConstructInternalThread ();
 172
 173                 private InternalThread Internal {
 174                         get {
 175                                 if (internal_thread == null)
 176                                         ConstructInternalThread ();
 177                                 return internal_thread;
 178                         }
 179                 }
 180
 181                 public static Context CurrentContext {
 182                         [SecurityPermission (SecurityAction.LinkDemand, Infrastructure=true)]
 183                         get {
 184                                 return(AppDomain.InternalGetContext ());
 185                         }
 186                 }
 187
 188                 /*
 189                  * These two methods return an array in the target
 190                  * domain with the same content as the argument.  If
 191                  * the argument is already in the target domain, then
 192                  * the argument is returned, otherwise a copy.
 193                  */
 194                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 195                 private extern static byte[] ByteArrayToRootDomain (byte[] arr);
 196
 197                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 198                 private extern static byte[] ByteArrayToCurrentDomain (byte[] arr);
 199
 200 #if !MOONLIGHT
 201                 public static IPrincipal CurrentPrincipal {
 202                         get {
 203                                 Thread th = CurrentThread;
 204
 205                                 if (th.principal_version != th.Internal._serialized_principal_version)
 206                                         th.principal = null;
 207
 208                                 if (th.principal != null)
 209                                         return th.principal;
 210
 211                                 if (th.Internal._serialized_principal != null) {
 212                                         try {
 213                                                 BinaryFormatter bf = new BinaryFormatter ();
 214                                                 MemoryStream ms = new MemoryStream (ByteArrayToCurrentDomain (th.Internal._serialized_principal));
 215                                                 th.principal = (IPrincipal) bf.Deserialize (ms);
 216                                                 th.principal_version = th.Internal._serialized_principal_version;
 217                                                 return th.principal;
 218                                         } catch (Exception) {
 219                                         }
 220                                 }
 221
 222                                 th.principal = GetDomain ().DefaultPrincipal;
 223                                 th.principal_version = th.Internal._serialized_principal_version;
 224                                 return th.principal;
 225                         }
 226                         [SecurityPermission (SecurityAction.Demand, ControlPrincipal = true)]
 227                         set {
 228                                 Thread th = CurrentThread;
 229
 230                                 ++th.Internal._serialized_principal_version;
 231                                 try {
 232                                         BinaryFormatter bf = new BinaryFormatter ();
 233                                         MemoryStream ms = new MemoryStream ();
 234                                         bf.Serialize (ms, value);
 235                                         th.Internal._serialized_principal = ByteArrayToRootDomain (ms.ToArray ());
 236                                 } catch (Exception) {
 237                                         th.Internal._serialized_principal = null;
 238                                 }
 239
 240                                 th.principal = value;
 241                                 th.principal_version = th.Internal._serialized_principal_version;
 242                         }
 243                 }
 244 #endif
 245
 246                 // Looks up the object associated with the current thread
 247                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 248                 private extern static InternalThread CurrentInternalThread_internal();
 249
 250                 public static Thread CurrentThread {
 251                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 252                         get {
 253                                 if (current_thread == null)
 254                                         current_thread = new Thread (CurrentInternalThread_internal ());
 255                                 return current_thread;
 256                         }
 257                 }
 258
 259                 internal static int CurrentThreadId {
 260                         get {
 261                                 return (int)(CurrentThread.internal_thread.thread_id);
 262                         }
 263                 }
 264
 265 #if !MOONLIGHT
 266                 // Stores a hash keyed by strings of LocalDataStoreSlot objects
 267                 static Hashtable datastorehash;
 268                 private static object datastore_lock = new object ();
 269
 270                 private static void InitDataStoreHash () {
 271                         lock (datastore_lock) {
 272                                 if (datastorehash == null) {
 273                                         datastorehash = Hashtable.Synchronized(new Hashtable());
 274                                 }
 275                         }
 276                 }
 277
 278                 public static LocalDataStoreSlot AllocateNamedDataSlot (string name) {
 279                         lock (datastore_lock) {
 280                                 if (datastorehash == null)
 281                                         InitDataStoreHash ();
 282                                 LocalDataStoreSlot slot = (LocalDataStoreSlot)datastorehash [name];
 283                                 if (slot != null) {
 284                                         // This exception isnt documented (of
 285                                         // course) but .net throws it
 286                                         throw new ArgumentException("Named data slot already added");
 287                                 }
 288
 289                                 slot = AllocateDataSlot ();
 290
 291                                 datastorehash.Add (name, slot);
 292
 293                                 return slot;
 294                         }
 295                 }
 296
 297                 public static void FreeNamedDataSlot (string name) {
 298                         lock (datastore_lock) {
 299                                 if (datastorehash == null)
 300                                         InitDataStoreHash ();
 301                                 LocalDataStoreSlot slot = (LocalDataStoreSlot)datastorehash [name];
 302
 303                                 if (slot != null) {
 304                                         datastorehash.Remove (slot);
 305                                 }
 306                         }
 307                 }
 308
 309                 public static LocalDataStoreSlot AllocateDataSlot () {
 310                         return new LocalDataStoreSlot (true);
 311                 }
 312
 313                 public static object GetData (LocalDataStoreSlot slot) {
 314                         object[] slots = local_slots;
 315                         if (slot == null)
 316                                 throw new ArgumentNullException ("slot");
 317                         if (slots != null && slot.slot < slots.Length)
 318                                 return slots [slot.slot];
 319                         return null;
 320                 }
 321
 322                 public static void SetData (LocalDataStoreSlot slot, object data) {
 323                         object[] slots = local_slots;
 324                         if (slot == null)
 325                                 throw new ArgumentNullException ("slot");
 326                         if (slots == null) {
 327                                 slots = new object [slot.slot + 2];
 328                                 local_slots = slots;
 329                         } else if (slot.slot >= slots.Length) {
 330                                 object[] nslots = new object [slot.slot + 2];
 331                                 slots.CopyTo (nslots, 0);
 332                                 slots = nslots;
 333                                 local_slots = slots;
 334                         }
 335                         slots [slot.slot] = data;
 336                 }
 337
 338                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 339                 internal extern static void FreeLocalSlotValues (int slot, bool thread_local);
 340
 341                 public static LocalDataStoreSlot GetNamedDataSlot(string name) {
 342                         lock (datastore_lock) {
 343                                 if (datastorehash == null)
 344                                         InitDataStoreHash ();
 345                                 LocalDataStoreSlot slot=(LocalDataStoreSlot)datastorehash[name];
 346
 347                                 if(slot==null) {
 348                                         slot=AllocateNamedDataSlot(name);
 349                                 }
 350
 351                                 return(slot);
 352                         }
 353                 }
 354 #endif
 355
 356                 public static AppDomain GetDomain() {
 357                         return AppDomain.CurrentDomain;
 358                 }
 359
 360                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 361                 public extern static int GetDomainID();
 362
 363                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 364                 private extern static void ResetAbort_internal();
 365
 366                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 367                 public static void ResetAbort ()
 368                 {
 369                         ResetAbort_internal ();
 370                 }
 371
 372                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 373                 private extern static void Sleep_internal(int ms);
 374
 375                 public static void Sleep (int millisecondsTimeout)
 376                 {
 377                         if (millisecondsTimeout < Timeout.Infinite)
 378                                 throw new ArgumentOutOfRangeException ("millisecondsTimeout", "Negative timeout");
 379
 380                         Sleep_internal (millisecondsTimeout);
 381                 }
 382
 383                 public static void Sleep (TimeSpan timeout)
 384                 {
 385                         long ms = (long) timeout.TotalMilliseconds;
 386                         if (ms < Timeout.Infinite || ms > Int32.MaxValue)
 387                                 throw new ArgumentOutOfRangeException ("timeout", "timeout out of range");
 388
 389                         Sleep_internal ((int) ms);
 390                 }
 391
 392                 // Returns the system thread handle
 393                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 394                 private extern IntPtr Thread_internal (MulticastDelegate start);
 395
 396                 public Thread(ThreadStart start) {
 397                         if(start==null) {
 398                                 throw new ArgumentNullException("Null ThreadStart");
 399                         }
 400                         threadstart=start;
 401                 }
 402
 403                 private Thread (InternalThread it) {
 404                         internal_thread = it;
 405                 }
 406
 407 #if !MOONLIGHT
 408                 [Obsolete ("Deprecated in favor of GetApartmentState, SetApartmentState and TrySetApartmentState.")]
 409                 public ApartmentState ApartmentState {
 410                         get {
 411                                 if ((ThreadState & ThreadState.Stopped) != 0)
 412                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 413
 414                                 return (ApartmentState)Internal.apartment_state;
 415                         }
 416
 417                         set {
 418                                 TrySetApartmentState (value);
 419                         }
 420                 }
 421 #endif // !NET_2_1
 422
 423                 //[MethodImplAttribute (MethodImplOptions.InternalCall)]
 424                 //private static extern int current_lcid ();
 425
 426                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 427                 private extern static CultureInfo GetCachedCurrentCulture (InternalThread thread);
 428
 429                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 430                 private extern void SetCachedCurrentCulture (CultureInfo culture);
 431
 432                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 433                 private extern static CultureInfo GetCachedCurrentUICulture (InternalThread thread);
 434
 435                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 436                 private extern void SetCachedCurrentUICulture (CultureInfo culture);
 437
 438                 /* FIXME: in_currentculture exists once, but
 439                    culture_lock is once per appdomain.  Is it correct
 440                    to lock this way? */
 441                 static object culture_lock = new object ();
 442
 443                 /*
 444                  * Thread objects are shared between appdomains, and CurrentCulture
 445                  * should always return an object in the calling appdomain. See bug
 446                  * http://bugzilla.ximian.com/show_bug.cgi?id=50049 for more info.
 447                  * This is hard to implement correctly and efficiently, so the current
 448                  * implementation is not perfect: changes made in one appdomain to the
 449                  * state of the current cultureinfo object are not visible to other
 450                  * appdomains.
 451                  */
 452                 public CultureInfo CurrentCulture {
 453                         get {
 454                                 if (Internal.in_currentculture)
 455                                         /* Bail out */
 456                                         return CultureInfo.InvariantCulture;
 457
 458                                 CultureInfo culture = GetCachedCurrentCulture (Internal);
 459                                 if (culture != null)
 460                                         return culture;
 461
 462                                 byte[] arr = ByteArrayToCurrentDomain (Internal.serialized_culture_info);
 463                                 if (arr == null) {
 464                                         lock (culture_lock) {
 465                                                 Internal.in_currentculture=true;
 466                                                 culture = CultureInfo.ConstructCurrentCulture ();
 467                                                 //
 468                                                 // Don't serialize the culture in this case to avoid
 469                                                 // initializing the serialization infrastructure in the
 470                                                 // common case when the culture is not set explicitly.
 471                                                 //
 472                                                 SetCachedCurrentCulture (culture);
 473                                                 Internal.in_currentculture = false;
 474                                                 NumberFormatter.SetThreadCurrentCulture (culture);
 475                                                 return culture;
 476                                         }
 477                                 }
 478
 479                                 /*
 480                                  * No cultureinfo object exists for this domain, so create one
 481                                  * by deserializing the serialized form.
 482                                  */
 483                                 Internal.in_currentculture = true;
 484                                 try {
 485                                         BinaryFormatter bf = new BinaryFormatter ();
 486                                         MemoryStream ms = new MemoryStream (arr);
 487                                         culture = (CultureInfo)bf.Deserialize (ms);
 488                                         SetCachedCurrentCulture (culture);
 489                                 } finally {
 490                                         Internal.in_currentculture = false;
 491                                 }
 492
 493                                 NumberFormatter.SetThreadCurrentCulture (culture);
 494                                 return culture;
 495                         }
 496
 497                         [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 498                         set {
 499                                 if (value == null)
 500                                         throw new ArgumentNullException ("value");
 501
 502                                 CultureInfo culture = GetCachedCurrentCulture (Internal);
 503                                 if (culture == value)
 504                                         return;
 505
 506                                 value.CheckNeutral ();
 507                                 Internal.in_currentculture = true;
 508                                 try {
 509                                         SetCachedCurrentCulture (value);
 510
 511                                         byte[] serialized_form = null;
 512
 513                                         if (value.IsReadOnly && value.cached_serialized_form != null) {
 514                                                 serialized_form = value.cached_serialized_form;
 515                                         } else {
 516                                                 BinaryFormatter bf = new BinaryFormatter();
 517                                                 MemoryStream ms = new MemoryStream ();
 518                                                 bf.Serialize (ms, value);
 519
 520                                                 serialized_form = ms.GetBuffer ();
 521                                                 if (value.IsReadOnly)
 522                                                         value.cached_serialized_form = serialized_form;
 523                                         }
 524
 525                                         Internal.serialized_culture_info = ByteArrayToRootDomain (serialized_form);
 526                                 } finally {
 527                                         Internal.in_currentculture = false;
 528                                 }
 529                                 NumberFormatter.SetThreadCurrentCulture (value);
 530                         }
 531                 }
 532
 533                 public CultureInfo CurrentUICulture {
 534                         get {
 535                                 if (Internal.in_currentculture)
 536                                         /* Bail out */
 537                                         return CultureInfo.InvariantCulture;
 538
 539                                 CultureInfo culture = GetCachedCurrentUICulture (Internal);
 540                                 if (culture != null)
 541                                         return culture;
 542
 543                                 byte[] arr = ByteArrayToCurrentDomain (Internal.serialized_ui_culture_info);
 544                                 if (arr == null) {
 545                                         lock (culture_lock) {
 546                                                 Internal.in_currentculture=true;
 547                                                 /* We don't
 548                                                  * distinguish
 549                                                  * between
 550                                                  * System and
 551                                                  * UI cultures
 552                                                  */
 553                                                 culture = CultureInfo.ConstructCurrentUICulture ();
 554                                                 //
 555                                                 // Don't serialize the culture in this case to avoid
 556                                                 // initializing the serialization infrastructure in the
 557                                                 // common case when the culture is not set explicitly.
 558                                                 //
 559                                                 SetCachedCurrentUICulture (culture);
 560                                                 Internal.in_currentculture = false;
 561                                                 return culture;
 562                                         }
 563                                 }
 564
 565                                 /*
 566                                  * No cultureinfo object exists for this domain, so create one
 567                                  * by deserializing the serialized form.
 568                                  */
 569                                 Internal.in_currentculture = true;
 570                                 try {
 571                                         BinaryFormatter bf = new BinaryFormatter ();
 572                                         MemoryStream ms = new MemoryStream (arr);
 573                                         culture = (CultureInfo)bf.Deserialize (ms);
 574                                         SetCachedCurrentUICulture (culture);
 575                                 }
 576                                 finally {
 577                                         Internal.in_currentculture = false;
 578                                 }
 579
 580                                 return culture;
 581                         }
 582
 583                         set {
 584                                 if (value == null)
 585                                         throw new ArgumentNullException ("value");
 586
 587                                 CultureInfo culture = GetCachedCurrentUICulture (Internal);
 588                                 if (culture == value)
 589                                         return;
 590
 591                                 Internal.in_currentculture = true;
 592                                 try {
 593                                         SetCachedCurrentUICulture (value);
 594
 595                                         byte[] serialized_form = null;
 596
 597                                         if (value.IsReadOnly && value.cached_serialized_form != null) {
 598                                                 serialized_form = value.cached_serialized_form;
 599                                         } else {
 600                                                 BinaryFormatter bf = new BinaryFormatter();
 601                                                 MemoryStream ms = new MemoryStream ();
 602                                                 bf.Serialize (ms, value);
 603
 604                                                 serialized_form = ms.GetBuffer ();
 605                                                 if (value.IsReadOnly)
 606                                                         value.cached_serialized_form = serialized_form;
 607                                         }
 608
 609                                         Internal.serialized_ui_culture_info = ByteArrayToRootDomain (serialized_form);
 610                                 } finally {
 611                                         Internal.in_currentculture = false;
 612                                 }
 613                         }
 614                 }
 615
 616                 public bool IsThreadPoolThread {
 617                         get {
 618                                 return IsThreadPoolThreadInternal;
 619                         }
 620                 }
 621
 622                 internal bool IsThreadPoolThreadInternal {
 623                         get {
 624                                 return Internal.threadpool_thread;
 625                         }
 626                         set {
 627                                 Internal.threadpool_thread = value;
 628                         }
 629                 }
 630
 631                 public bool IsAlive {
 632                         get {
 633                                 ThreadState curstate = GetState (Internal);
 634
 635                                 if((curstate & ThreadState.Aborted) != 0 ||
 636                                    (curstate & ThreadState.Stopped) != 0 ||
 637                                    (curstate & ThreadState.Unstarted) != 0) {
 638                                         return(false);
 639                                 } else {
 640                                         return(true);
 641                                 }
 642                         }
 643                 }
 644
 645                 public bool IsBackground {
 646                         get {
 647                                 ThreadState thread_state = GetState (Internal);
 648                                 if ((thread_state & ThreadState.Stopped) != 0)
 649                                         throw new ThreadStateException ("Thread is dead; state can not be accessed.");
 650
 651                                 return (thread_state & ThreadState.Background) != 0;
 652                         }
 653
 654                         set {
 655                                 if (value) {
 656                                         SetState (Internal, ThreadState.Background);
 657                                 } else {
 658                                         ClrState (Internal, ThreadState.Background);
 659                                 }
 660                         }
 661                 }
 662
 663                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 664                 private extern static string GetName_internal (InternalThread thread);
 665
 666                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 667                 private extern static void SetName_internal (InternalThread thread, String name);
 668
 669                 /*
 670                  * The thread name must be shared by appdomains, so it is stored in
 671                  * unmanaged code.
 672                  */
 673
 674                 public string Name {
 675                         get {
 676                                 return GetName_internal (Internal);
 677                         }
 678
 679                         set {
 680                                 SetName_internal (Internal, value);
 681                         }
 682                 }
 683
 684 #if !MOONLIGHT
 685                 public ThreadPriority Priority {
 686                         get {
 687                                 return(ThreadPriority.Lowest);
 688                         }
 689
 690                         set {
 691                                 // FIXME: Implement setter.
 692                         }
 693                 }
 694 #endif
 695
 696                 public ThreadState ThreadState {
 697                         get {
 698                                 return GetState (Internal);
 699                         }
 700                 }
 701
 702                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 703                 private extern static void Abort_internal (InternalThread thread, object stateInfo);
 704
 705                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 706                 public void Abort ()
 707                 {
 708                         Abort_internal (Internal, null);
 709                 }
 710
 711 #if !MOONLIGHT
 712                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 713                 public void Abort (object stateInfo)
 714                 {
 715                         Abort_internal (Internal, stateInfo);
 716                 }
 717
 718                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 719                 internal extern object GetAbortExceptionState ();
 720
 721                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 722                 private extern static void Interrupt_internal (InternalThread thread);
 723
 724                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 725                 public void Interrupt ()
 726                 {
 727                         Interrupt_internal (Internal);
 728                 }
 729 #endif
 730
 731                 // The current thread joins with 'this'. Set ms to 0 to block
 732                 // until this actually exits.
 733                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 734                 private extern static bool Join_internal(InternalThread thread, int ms, IntPtr handle);
 735
 736                 public void Join()
 737                 {
 738                         Join_internal(Internal, Timeout.Infinite, Internal.system_thread_handle);
 739                 }
 740
 741                 public bool Join(int millisecondsTimeout)
 742                 {
 743                         if (millisecondsTimeout < Timeout.Infinite)
 744                                 throw new ArgumentOutOfRangeException ("millisecondsTimeout", "Timeout less than zero");
 745
 746                         return Join_internal (Internal, millisecondsTimeout, Internal.system_thread_handle);
 747                 }
 748
 749 #if !MOONLIGHT
 750                 public bool Join(TimeSpan timeout)
 751                 {
 752                         long ms = (long) timeout.TotalMilliseconds;
 753                         if (ms < Timeout.Infinite || ms > Int32.MaxValue)
 754                                 throw new ArgumentOutOfRangeException ("timeout", "timeout out of range");
 755
 756                         return Join_internal (Internal, (int) ms, Internal.system_thread_handle);
 757                 }
 758 #endif
 759
 760 #if NET_1_1
 761                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 762                 public extern static void MemoryBarrier ();
 763 #endif
 764
 765 #if !MOONLIGHT
 766                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 767                 private extern void Resume_internal();
 768
 769                 [Obsolete ("")]
 770                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 771                 public void Resume ()
 772                 {
 773                         Resume_internal ();
 774                 }
 775 #endif // !NET_2_1
 776
 777                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 778                 private extern static void SpinWait_nop ();
 779
 780
 781                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 782                 public static void SpinWait (int iterations)
 783                 {
 784                         if (iterations < 0)
 785                                 return;
 786                         while (iterations-- > 0)
 787                         {
 788                                 SpinWait_nop ();
 789                         }
 790                 }
 791
 792 #if MOONLIGHT
 793                 private void StartSafe ()
 794                 {
 795                         current_thread = this;
 796
 797                         try {
 798                                 if (threadstart is ThreadStart) {
 799                                         ((ThreadStart) threadstart) ();
 800                                 } else {
 801                                         ((ParameterizedThreadStart) threadstart) (start_obj);
 802                                 }
 803                         } catch (ThreadAbortException) {
 804                                 // do nothing
 805                         } catch (Exception ex) {
 806                                 MoonlightUnhandledException (ex);
 807                         }
 808                 }
 809
 810                 static MethodInfo moonlight_unhandled_exception = null;
 811
 812                 static internal void MoonlightUnhandledException (Exception e)
 813                 {
 814                         try {
 815                                 if (moonlight_unhandled_exception == null) {
 816                                         var assembly = System.Reflection.Assembly.Load ("System.Windows, Version=2.0.5.0, Culture=Neutral, PublicKeyToken=7cec85d7bea7798e");
 817                                         var application = assembly.GetType ("System.Windows.Application");
 818                                         moonlight_unhandled_exception = application.GetMethod ("OnUnhandledException",
 819                                                 System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
 820                                 }
 821                                 moonlight_unhandled_exception.Invoke (null, new object [] { null, e });
 822                         }
 823                         catch {
 824                                 try {
 825                                         Console.WriteLine ("Unexpected exception while trying to report unhandled application exception: {0}", e);
 826                                 } catch {
 827                                 }
 828                         }
 829                 }
 830 #endif
 831
 832                 private void StartUnsafe ()
 833                 {
 834                         current_thread = this;
 835
 836                         if (threadstart is ThreadStart) {
 837                                 ((ThreadStart) threadstart) ();
 838                         } else {
 839                                 ((ParameterizedThreadStart) threadstart) (start_obj);
 840                         }
 841                 }
 842
 843                 public void Start() {
 844                         // propagate informations from the original thread to the new thread
 845                         if (!ExecutionContext.IsFlowSuppressed ())
 846                                 ec_to_set = ExecutionContext.Capture ();
 847                         Internal._serialized_principal = CurrentThread.Internal._serialized_principal;
 848
 849                         // Thread_internal creates and starts the new thread,
 850 #if MOONLIGHT
 851                         if (Thread_internal((ThreadStart) StartSafe) == (IntPtr) 0)
 852 #else
 853                         if (Thread_internal((ThreadStart) StartUnsafe) == (IntPtr) 0)
 854 #endif
 855                                 throw new SystemException ("Thread creation failed.");
 856                 }
 857
 858 #if !MOONLIGHT
 859                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 860                 private extern static void Suspend_internal(InternalThread thread);
 861
 862                 [Obsolete ("")]
 863                 [SecurityPermission (SecurityAction.Demand, ControlThread=true)]
 864                 public void Suspend ()
 865                 {
 866                         Suspend_internal (Internal);
 867                 }
 868 #endif // !NET_2_1
 869
 870                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 871                 extern private static void SetState (InternalThread thread, ThreadState set);
 872
 873                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 874                 extern private static void ClrState (InternalThread thread, ThreadState clr);
 875
 876                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 877                 extern private static ThreadState GetState (InternalThread thread);
 878
 879 #if NET_1_1
 880
 881                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 882                 extern public static byte VolatileRead (ref byte address);
 883
 884                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 885                 extern public static double VolatileRead (ref double address);
 886
 887                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 888                 extern public static short VolatileRead (ref short address);
 889
 890                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 891                 extern public static int VolatileRead (ref int address);
 892
 893                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 894                 extern public static long VolatileRead (ref long address);
 895
 896                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 897                 extern public static IntPtr VolatileRead (ref IntPtr address);
 898
 899                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 900                 extern public static object VolatileRead (ref object address);
 901
 902                 [CLSCompliant(false)]
 903                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 904                 extern public static sbyte VolatileRead (ref sbyte address);
 905
 906                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 907                 extern public static float VolatileRead (ref float address);
 908
 909                 [CLSCompliant (false)]
 910                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 911                 extern public static ushort VolatileRead (ref ushort address);
 912
 913                 [CLSCompliant (false)]
 914                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 915                 extern public static uint VolatileRead (ref uint address);
 916
 917                 [CLSCompliant (false)]
 918                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 919                 extern public static ulong VolatileRead (ref ulong address);
 920
 921                 [CLSCompliant (false)]
 922                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 923                 extern public static UIntPtr VolatileRead (ref UIntPtr address);
 924
 925                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 926                 extern public static void VolatileWrite (ref byte address, byte value);
 927
 928                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 929                 extern public static void VolatileWrite (ref double address, double value);
 930
 931                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 932                 extern public static void VolatileWrite (ref short address, short value);
 933
 934                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 935                 extern public static void VolatileWrite (ref int address, int value);
 936
 937                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 938                 extern public static void VolatileWrite (ref long address, long value);
 939
 940                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 941                 extern public static void VolatileWrite (ref IntPtr address, IntPtr value);
 942
 943                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 944                 extern public static void VolatileWrite (ref object address, object value);
 945
 946                 [CLSCompliant(false)]
 947                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 948                 extern public static void VolatileWrite (ref sbyte address, sbyte value);
 949
 950                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 951                 extern public static void VolatileWrite (ref float address, float value);
 952
 953                 [CLSCompliant (false)]
 954                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 955                 extern public static void VolatileWrite (ref ushort address, ushort value);
 956
 957                 [CLSCompliant (false)]
 958                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 959                 extern public static void VolatileWrite (ref uint address, uint value);
 960
 961                 [CLSCompliant (false)]
 962                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 963                 extern public static void VolatileWrite (ref ulong address, ulong value);
 964
 965                 [CLSCompliant (false)]
 966                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 967                 extern public static void VolatileWrite (ref UIntPtr address, UIntPtr value);
 968
 969 #endif
 970
 971                 private static int GetNewManagedId() {
 972                         return Interlocked.Increment(ref _managed_id_counter);
 973                 }
 974
 975                 public Thread (ThreadStart start, int maxStackSize)
 976                 {
 977                         if (start == null)
 978                                 throw new ArgumentNullException ("start");
 979                         if (maxStackSize < 131072)
 980                                 throw new ArgumentException ("< 128 kb", "maxStackSize");
 981
 982                         threadstart = start;
 983                         Internal.stack_size = maxStackSize;
 984                 }
 985
 986                 public Thread (ParameterizedThreadStart start)
 987                 {
 988                         if (start == null)
 989                                 throw new ArgumentNullException ("start");
 990
 991                         threadstart = start;
 992                 }
 993
 994                 public Thread (ParameterizedThreadStart start, int maxStackSize)
 995                 {
 996                         if (start == null)
 997                                 throw new ArgumentNullException ("start");
 998                         if (maxStackSize < 131072)
 999                                 throw new ArgumentException ("< 128 kb", "maxStackSize");
1000
1001                         threadstart = start;
1002                         Internal.stack_size = maxStackSize;
1003                 }
1004
1005                 [MonoTODO ("limited to CompressedStack support")]
1006                 public ExecutionContext ExecutionContext {
1007                         [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
1008                         get {
1009                                 if (_ec == null)
1010                                         _ec = new ExecutionContext ();
1011                                 return _ec;
1012                         }
1013                 }
1014
1015                 public int ManagedThreadId {
1016                         [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
1017                         get {
1018                                 if (Internal.managed_id == 0) {
1019                                         int new_managed_id = GetNewManagedId ();
1020
1021                                         Interlocked.CompareExchange (ref Internal.managed_id, new_managed_id, 0);
1022                                 }
1023
1024                                 return Internal.managed_id;
1025                         }
1026                 }
1027
1028                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
1029                 public static void BeginCriticalRegion ()
1030                 {
1031                         CurrentThread.Internal.critical_region_level++;
1032                 }
1033
1034                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
1035                 public static void EndCriticalRegion ()
1036                 {
1037                         CurrentThread.Internal.critical_region_level--;
1038                 }
1039
1040                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
1041                 public static void BeginThreadAffinity ()
1042                 {
1043                         // Managed and native threads are currently bound together.
1044                 }
1045
1046                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
1047                 public static void EndThreadAffinity ()
1048                 {
1049                         // Managed and native threads are currently bound together.
1050                 }
1051
1052 #if !MOONLIGHT
1053                 public ApartmentState GetApartmentState ()
1054                 {
1055                         return (ApartmentState)Internal.apartment_state;
1056                 }
1057
1058                 public void SetApartmentState (ApartmentState state)
1059                 {
1060                         if (!TrySetApartmentState (state))
1061                                 throw new InvalidOperationException ("Failed to set the specified COM apartment state.");
1062                 }
1063
1064                 public bool TrySetApartmentState (ApartmentState state)
1065                 {
1066                         /* Only throw this exception when changing the
1067                          * state of another thread.  See bug 324338
1068                          */
1069                         if ((this != CurrentThread) &&
1070                             (ThreadState & ThreadState.Unstarted) == 0)
1071                                 throw new ThreadStateException ("Thread was in an invalid state for the operation being executed.");
1072
1073                         if ((ApartmentState)Internal.apartment_state != ApartmentState.Unknown)
1074                                 return false;
1075
1076                         Internal.apartment_state = (byte)state;
1077
1078                         return true;
1079                 }
1080 #endif // !NET_2_1
1081
1082                 [ComVisible (false)]
1083                 public override int GetHashCode ()
1084                 {
1085                         return ManagedThreadId;
1086                 }
1087
1088                 public void Start (object parameter)
1089                 {
1090                         start_obj = parameter;
1091                         Start ();
1092                 }
1093
1094 #if !MOONLIGHT
1095                 // NOTE: This method doesn't show in the class library status page because
1096                 // it cannot be "found" with the StrongNameIdentityPermission for ECMA key.
1097                 // But it's there!
1098                 [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
1099                 [StrongNameIdentityPermission (SecurityAction.LinkDemand, PublicKey="00000000000000000400000000000000")]
1100                 [Obsolete ("see CompressedStack class")]
1101 #if NET_1_1
1102                 public
1103 #else
1104                 internal
1105 #endif
1106                 CompressedStack GetCompressedStack ()
1107                 {
1108                         // Note: returns null if no CompressedStack has been set.
1109                         // However CompressedStack.GetCompressedStack returns an
1110                         // (empty?) CompressedStack instance.
1111                         CompressedStack cs = ExecutionContext.SecurityContext.CompressedStack;
1112                         return ((cs == null) || cs.IsEmpty ()) ? null : cs.CreateCopy ();
1113                 }
1114
1115                 // NOTE: This method doesn't show in the class library status page because
1116                 // it cannot be "found" with the StrongNameIdentityPermission for ECMA key.
1117                 // But it's there!
1118                 [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
1119                 [StrongNameIdentityPermission (SecurityAction.LinkDemand, PublicKey="00000000000000000400000000000000")]
1120                 [Obsolete ("see CompressedStack class")]
1121 #if NET_1_1
1122                 public
1123 #else
1124                 internal
1125 #endif
1126                 void SetCompressedStack (CompressedStack stack)
1127                 {
1128                         ExecutionContext.SecurityContext.CompressedStack = stack;
1129                 }
1130
1131 #endif
1132
1133 #if NET_1_1
1134                 void _Thread.GetIDsOfNames ([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
1135                 {
1136                         throw new NotImplementedException ();
1137                 }
1138
1139                 void _Thread.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
1140                 {
1141                         throw new NotImplementedException ();
1142                 }
1143
1144                 void _Thread.GetTypeInfoCount (out uint pcTInfo)
1145                 {
1146                         throw new NotImplementedException ();
1147                 }
1148
1149                 void _Thread.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams,
1150                         IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
1151                 {
1152                         throw new NotImplementedException ();
1153                 }
1154 #endif
1155         }
1156 }