loader/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <assert.h>
  10 #include <unistd.h>
  11
  12 #include "wine/port.h"
  13 #include "wine/winbase16.h"
  14 #include "ntddk.h"
  15 #include "callback.h"
  16 #include "drive.h"
  17 #include "file.h"
  18 #include "global.h"
  19 #include "instance.h"
  20 #include "miscemu.h"
  21 #include "module.h"
  22 #include "queue.h"
  23 #include "selectors.h"
  24 #include "stackframe.h"
  25 #include "task.h"
  26 #include "thread.h"
  27 #include "toolhelp.h"
  28 #include "winnt.h"
  29 #include "syslevel.h"
  30 #include "winsock.h"
  31 #include "debugtools.h"
  32 #include "services.h"
  33 #include "server.h"
  34
  35
  36 DEFAULT_DEBUG_CHANNEL(task);
  37 DECLARE_DEBUG_CHANNEL(relay);
  38 DECLARE_DEBUG_CHANNEL(toolhelp);
  39
  40   /* Min. number of thunks allocated when creating a new segment */
  41 #define MIN_THUNKS  32
  42
  43
  44 static THHOOK DefaultThhook;
  45 THHOOK *pThhook = &DefaultThhook;
  46
  47 #define hCurrentTask (pThhook->CurTDB)
  48 #define hFirstTask   (pThhook->HeadTDB)
  49 #define hLockedTask  (pThhook->LockTDB)
  50
  51 static UINT16 nTaskCount = 0;
  52
  53 static HTASK initial_task;
  54
  55 /***********************************************************************
  56  *           TASK_InstallTHHook
  57  */
  58 void TASK_InstallTHHook( THHOOK *pNewThhook )
  59 {
  60      THHOOK *pOldThhook = pThhook;
  61
  62      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  63
  64      *pThhook = *pOldThhook;
  65 }
  66
  67 /***********************************************************************
  68  *           TASK_GetNextTask
  69  */
  70 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  71 {
  72     TDB* pTask = TASK_GetPtr( hTask );
  73
  74     if (pTask->hNext) return pTask->hNext;
  75     return (hFirstTask != hTask) ? hFirstTask : 0;
  76 }
  77
  78
  79 /***********************************************************************
  80  *           TASK_GetPtr
  81  */
  82 TDB *TASK_GetPtr( HTASK16 hTask )
  83 {
  84     return GlobalLock16( hTask );
  85 }
  86
  87
  88 /***********************************************************************
  89  *           TASK_GetCurrent
  90  */
  91 TDB *TASK_GetCurrent(void)
  92 {
  93     return TASK_GetPtr( GetCurrentTask() );
  94 }
  95
  96
  97 /***********************************************************************
  98  *           TASK_LinkTask
  99  */
 100 static void TASK_LinkTask( HTASK16 hTask )
 101 {
 102     HTASK16 *prevTask;
 103     TDB *pTask;
 104
 105     if (!(pTask = TASK_GetPtr( hTask ))) return;
 106     prevTask = &hFirstTask;
 107     while (*prevTask)
 108     {
 109         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 110         if (prevTaskPtr->priority >= pTask->priority) break;
 111         prevTask = &prevTaskPtr->hNext;
 112     }
 113     pTask->hNext = *prevTask;
 114     *prevTask = hTask;
 115     nTaskCount++;
 116 }
 117
 118
 119 /***********************************************************************
 120  *           TASK_UnlinkTask
 121  */
 122 static void TASK_UnlinkTask( HTASK16 hTask )
 123 {
 124     HTASK16 *prevTask;
 125     TDB *pTask;
 126
 127     prevTask = &hFirstTask;
 128     while (*prevTask && (*prevTask != hTask))
 129     {
 130         pTask = TASK_GetPtr( *prevTask );
 131         prevTask = &pTask->hNext;
 132     }
 133     if (*prevTask)
 134     {
 135         pTask = TASK_GetPtr( *prevTask );
 136         *prevTask = pTask->hNext;
 137         pTask->hNext = 0;
 138         nTaskCount--;
 139     }
 140 }
 141
 142
 143 /***********************************************************************
 144  *           TASK_CreateThunks
 145  *
 146  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 147  * and containing 'count' entries.
 148  */
 149 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 150 {
 151     int i;
 152     WORD free;
 153     THUNKS *pThunk;
 154
 155     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 156     pThunk->next = 0;
 157     pThunk->magic = THUNK_MAGIC;
 158     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 159     free = pThunk->free;
 160     for (i = 0; i < count-1; i++)
 161     {
 162         free += 8;  /* Offset of next thunk */
 163         pThunk->thunks[4*i] = free;
 164     }
 165     pThunk->thunks[4*i] = 0;  /* Last thunk */
 166 }
 167
 168
 169 /***********************************************************************
 170  *           TASK_AllocThunk
 171  *
 172  * Allocate a thunk for MakeProcInstance().
 173  */
 174 static SEGPTR TASK_AllocThunk(void)
 175 {
 176     TDB *pTask;
 177     THUNKS *pThunk;
 178     WORD sel, base;
 179
 180     if (!(pTask = TASK_GetCurrent())) return 0;
 181     sel = pTask->hCSAlias;
 182     pThunk = &pTask->thunks;
 183     base = (int)pThunk - (int)pTask;
 184     while (!pThunk->free)
 185     {
 186         sel = pThunk->next;
 187         if (!sel)  /* Allocate a new segment */
 188         {
 189             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 190                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 191             if (!sel) return (SEGPTR)0;
 192             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 193             pThunk->next = sel;
 194         }
 195         pThunk = (THUNKS *)GlobalLock16( sel );
 196         base = 0;
 197     }
 198     base += pThunk->free;
 199     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 200     return MAKESEGPTR( sel, base );
 201 }
 202
 203
 204 /***********************************************************************
 205  *           TASK_FreeThunk
 206  *
 207  * Free a MakeProcInstance() thunk.
 208  */
 209 static BOOL TASK_FreeThunk( SEGPTR thunk )
 210 {
 211     TDB *pTask;
 212     THUNKS *pThunk;
 213     WORD sel, base;
 214
 215     if (!(pTask = TASK_GetCurrent())) return 0;
 216     sel = pTask->hCSAlias;
 217     pThunk = &pTask->thunks;
 218     base = (int)pThunk - (int)pTask;
 219     while (sel && (sel != HIWORD(thunk)))
 220     {
 221         sel = pThunk->next;
 222         pThunk = (THUNKS *)GlobalLock16( sel );
 223         base = 0;
 224     }
 225     if (!sel) return FALSE;
 226     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 227     pThunk->free = LOWORD(thunk) - base;
 228     return TRUE;
 229 }
 230
 231
 232 /***********************************************************************
 233  *           TASK_Create
 234  *
 235  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 236  *       to be careful to protect global data structures. We do this
 237  *       by entering the Win16Lock while linking the task into the
 238  *       global task list.
 239  */
 240 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, TEB *teb, LPCSTR cmdline, BYTE len )
 241 {
 242     HTASK16 hTask;
 243     TDB *pTask;
 244     char name[10];
 245
 246       /* Allocate the task structure */
 247
 248     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 249     if (!hTask) return NULL;
 250     pTask = TASK_GetPtr( hTask );
 251     FarSetOwner16( hTask, pModule->self );
 252
 253     /* Fill the task structure */
 254
 255     pTask->hSelf = hTask;
 256
 257     if (teb && teb->tibflags & TEBF_WIN32)
 258     {
 259         pTask->flags        |= TDBF_WIN32;
 260         pTask->hInstance     = pModule->self;
 261         pTask->hPrevInstance = 0;
 262         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 263            in NE_InitProcess */
 264     }
 265
 266     pTask->version       = pModule->expected_version;
 267     pTask->hModule       = pModule->self;
 268     pTask->hParent       = GetCurrentTask();
 269     pTask->magic         = TDB_MAGIC;
 270     pTask->nCmdShow      = cmdShow;
 271     pTask->teb           = teb;
 272     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 273     strcpy( pTask->curdir, "\\" );
 274     lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 275                  sizeof(pTask->curdir) - 1 );
 276
 277       /* Create the thunks block */
 278
 279     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 280
 281       /* Copy the module name */
 282
 283     GetModuleName16( pModule->self, name, sizeof(name) );
 284     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 285
 286       /* Allocate a selector for the PDB */
 287
 288     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 289                                       pModule->self, WINE_LDT_FLAGS_DATA );
 290
 291       /* Fill the PDB */
 292
 293     pTask->pdb.int20 = 0x20cd;
 294     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 295     PUT_UA_DWORD(&pTask->pdb.dispatcher[1],
 296                  (DWORD)GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" ));
 297     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 298     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 299     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 300     pTask->pdb.fileHandlesPtr =
 301         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 302     pTask->pdb.hFileHandles = 0;
 303     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 304     /* FIXME: should we make a copy of the environment? */
 305     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 306     pTask->pdb.nbFiles        = 20;
 307
 308     /* Fill the command line */
 309
 310     if (!cmdline)
 311     {
 312         cmdline = GetCommandLineA();
 313         /* remove the first word (program name) */
 314         if (*cmdline == '"')
 315             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 316         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 317         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 318         len = strlen(cmdline);
 319     }
 320     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 321     pTask->pdb.cmdLine[0] = len;
 322     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 323     /* pTask->pdb.cmdLine[len+1] = 0; */
 324
 325     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 326
 327       /* Get the compatibility flags */
 328
 329     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 330
 331       /* Allocate a code segment alias for the TDB */
 332
 333     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 334                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 335
 336       /* Default DTA overwrites command line */
 337
 338     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 339
 340     /* Create scheduler event for 16-bit tasks */
 341
 342     if ( !(pTask->flags & TDBF_WIN32) )
 343         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 344
 345     /* Enter task handle into thread */
 346
 347     if (teb) teb->htask16 = hTask;
 348     if (!initial_task) initial_task = hTask;
 349
 350     return pTask;
 351 }
 352
 353
 354 /***********************************************************************
 355  *           TASK_DeleteTask
 356  */
 357 static void TASK_DeleteTask( HTASK16 hTask )
 358 {
 359     TDB *pTask;
 360     HGLOBAL16 hPDB;
 361
 362     if (!(pTask = TASK_GetPtr( hTask ))) return;
 363     hPDB = pTask->hPDB;
 364
 365     pTask->magic = 0xdead; /* invalidate signature */
 366
 367     /* Free the selector aliases */
 368
 369     GLOBAL_FreeBlock( pTask->hCSAlias );
 370     GLOBAL_FreeBlock( pTask->hPDB );
 371
 372     /* Free the task module */
 373
 374     FreeModule16( pTask->hModule );
 375
 376     /* Free the task structure itself */
 377
 378     GlobalFree16( hTask );
 379
 380     /* Free all memory used by this task (including the 32-bit stack, */
 381     /* the environment block and the thunk segments). */
 382
 383     GlobalFreeAll16( hPDB );
 384 }
 385
 386
 387 /***********************************************************************
 388  *           TASK_CreateMainTask
 389  *
 390  * Create a task for the main (32-bit) process.
 391  */
 392 void TASK_CreateMainTask(void)
 393 {
 394     TDB *pTask;
 395     STARTUPINFOA startup_info;
 396     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 397
 398     GetStartupInfoA( &startup_info );
 399     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 400     pTask = TASK_Create( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
 401                          cmdShow, NtCurrentTeb(), NULL, 0 );
 402     if (!pTask)
 403     {
 404         ERR("could not create task for main process\n");
 405         ExitProcess(1);
 406     }
 407
 408     /* Add the task to the linked list */
 409     /* (no need to get the win16 lock, we are the only thread at this point) */
 410     TASK_LinkTask( pTask->hSelf );
 411 }
 412
 413
 414 /* startup routine for a new 16-bit thread */
 415 static DWORD CALLBACK task_start( TDB *pTask )
 416 {
 417     DWORD ret;
 418
 419     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 420     NtCurrentTeb()->htask16 = pTask->hSelf;
 421
 422     _EnterWin16Lock();
 423     TASK_LinkTask( pTask->hSelf );
 424     pTask->teb = NtCurrentTeb();
 425     ret = NE_StartTask();
 426     _LeaveWin16Lock();
 427     return ret;
 428 }
 429
 430
 431 /***********************************************************************
 432  *           TASK_SpawnTask
 433  *
 434  * Spawn a new 16-bit task.
 435  */
 436 HTASK TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow, LPCSTR cmdline, BYTE len, HANDLE *hThread )
 437 {
 438     TDB *pTask;
 439
 440     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 441     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 442     {
 443         TASK_DeleteTask( pTask->hSelf );
 444         return 0;
 445     }
 446     return pTask->hSelf;
 447 }
 448
 449
 450 /***********************************************************************
 451  *           TASK_KillTask
 452  */
 453 void TASK_ExitTask(void)
 454 {
 455     TDB *pTask;
 456     DWORD lockCount;
 457
 458     /* Enter the Win16Lock to protect global data structures */
 459     _EnterWin16Lock();
 460
 461     pTask = TASK_GetCurrent();
 462     if ( !pTask )
 463     {
 464         _LeaveWin16Lock();
 465         return;
 466     }
 467
 468     TRACE("Killing task %04x\n", pTask->hSelf );
 469
 470     /* Perform USER cleanup */
 471
 472     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 473     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 474     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 475     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 476
 477     /* Remove the task from the list to be sure we never switch back to it */
 478     TASK_UnlinkTask( pTask->hSelf );
 479
 480     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 481     {
 482         TRACE("this is the last task, exiting\n" );
 483         ExitKernel16();
 484     }
 485
 486     if( nTaskCount )
 487     {
 488         TDB* p = TASK_GetPtr( hFirstTask );
 489         while( p )
 490         {
 491             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 492             p = TASK_GetPtr( p->hNext );
 493         }
 494     }
 495
 496     pTask->nEvents = 0;
 497
 498     if ( hLockedTask == pTask->hSelf )
 499         hLockedTask = 0;
 500
 501     TASK_DeleteTask( pTask->hSelf );
 502
 503     /* ... and completely release the Win16Lock, just in case. */
 504     ReleaseThunkLock( &lockCount );
 505 }
 506
 507
 508 /***********************************************************************
 509  *           InitTask  (KERNEL.91)
 510  *
 511  * Called by the application startup code.
 512  */
 513 void WINAPI InitTask16( CONTEXT86 *context )
 514 {
 515     TDB *pTask;
 516     INSTANCEDATA *pinstance;
 517     SEGPTR ptr;
 518
 519     context->Eax = 0;
 520     if (!(pTask = TASK_GetCurrent())) return;
 521
 522     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 523        as some apps, notably Visual Basic apps, *modify* the heap/stack
 524        size of the instance data segment before calling InitTask() */
 525
 526     /* Initialize the INSTANCEDATA structure */
 527     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 528     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 529     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 530     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 531                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 532
 533     /* Initialize the local heap */
 534     if (LOWORD(context->Ecx))
 535         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 536
 537     /* Initialize implicitly loaded DLLs */
 538     NE_InitializeDLLs( pTask->hModule );
 539     NE_DllProcessAttach( pTask->hModule );
 540
 541     /* Registers on return are:
 542      * ax     1 if OK, 0 on error
 543      * cx     stack limit in bytes
 544      * dx     cmdShow parameter
 545      * si     instance handle of the previous instance
 546      * di     instance handle of the new task
 547      * es:bx  pointer to command line inside PSP
 548      *
 549      * 0 (=%bp) is pushed on the stack
 550      */
 551     ptr = stack16_push( sizeof(WORD) );
 552     *(WORD *)MapSL(ptr) = 0;
 553     context->Esp -= 2;
 554
 555     context->Eax = 1;
 556
 557     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 558     else
 559     {
 560         LPBYTE p = &pTask->pdb.cmdLine[1];
 561         while ((*p == ' ') || (*p == '\t')) p++;
 562         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 563     }
 564     context->Ecx   = pinstance->stacktop;
 565     context->Edx   = pTask->nCmdShow;
 566     context->Esi   = (DWORD)pTask->hPrevInstance;
 567     context->Edi   = (DWORD)pTask->hInstance;
 568     context->SegEs = (WORD)pTask->hPDB;
 569 }
 570
 571
 572 /***********************************************************************
 573  *           WaitEvent  (KERNEL.30)
 574  */
 575 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 576 {
 577     TDB *pTask;
 578
 579     if (!hTask) hTask = GetCurrentTask();
 580     pTask = TASK_GetPtr( hTask );
 581
 582     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 583     {
 584         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 585         return TRUE;
 586     }
 587
 588     if (pTask->nEvents > 0)
 589     {
 590         pTask->nEvents--;
 591         return FALSE;
 592     }
 593
 594     if (pTask->teb == NtCurrentTeb())
 595     {
 596         DWORD lockCount;
 597
 598         NtResetEvent( pTask->hEvent, NULL );
 599         ReleaseThunkLock( &lockCount );
 600         SYSLEVEL_CheckNotLevel( 1 );
 601         WaitForSingleObject( pTask->hEvent, INFINITE );
 602         RestoreThunkLock( lockCount );
 603         if (pTask->nEvents > 0) pTask->nEvents--;
 604     }
 605     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 606
 607     return TRUE;
 608 }
 609
 610
 611 /***********************************************************************
 612  *           PostEvent  (KERNEL.31)
 613  */
 614 void WINAPI PostEvent16( HTASK16 hTask )
 615 {
 616     TDB *pTask;
 617
 618     if (!hTask) hTask = GetCurrentTask();
 619     if (!(pTask = TASK_GetPtr( hTask ))) return;
 620
 621     if ( !THREAD_IsWin16( pTask->teb ) )
 622     {
 623         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 624         return;
 625     }
 626
 627     pTask->nEvents++;
 628
 629     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 630 }
 631
 632
 633 /***********************************************************************
 634  *           SetPriority  (KERNEL.32)
 635  */
 636 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 637 {
 638     TDB *pTask;
 639     INT16 newpriority;
 640
 641     if (!hTask) hTask = GetCurrentTask();
 642     if (!(pTask = TASK_GetPtr( hTask ))) return;
 643     newpriority = pTask->priority + delta;
 644     if (newpriority < -32) newpriority = -32;
 645     else if (newpriority > 15) newpriority = 15;
 646
 647     pTask->priority = newpriority + 1;
 648     TASK_UnlinkTask( pTask->hSelf );
 649     TASK_LinkTask( pTask->hSelf );
 650     pTask->priority--;
 651 }
 652
 653
 654 /***********************************************************************
 655  *           LockCurrentTask  (KERNEL.33)
 656  */
 657 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 658 {
 659     if (bLock) hLockedTask = GetCurrentTask();
 660     else hLockedTask = 0;
 661     return hLockedTask;
 662 }
 663
 664
 665 /***********************************************************************
 666  *           IsTaskLocked  (KERNEL.122)
 667  */
 668 HTASK16 WINAPI IsTaskLocked16(void)
 669 {
 670     return hLockedTask;
 671 }
 672
 673
 674 /***********************************************************************
 675  *           OldYield  (KERNEL.117)
 676  */
 677 void WINAPI OldYield16(void)
 678 {
 679    DWORD count;
 680
 681    ReleaseThunkLock(&count);
 682    RestoreThunkLock(count);
 683 }
 684
 685 /***********************************************************************
 686  *           WIN32_OldYield16  (KERNEL.447)
 687  */
 688 void WINAPI WIN32_OldYield16(void)
 689 {
 690    DWORD count;
 691
 692    ReleaseThunkLock(&count);
 693    RestoreThunkLock(count);
 694 }
 695
 696 /***********************************************************************
 697  *           DirectedYield  (KERNEL.150)
 698  */
 699 void WINAPI DirectedYield16( HTASK16 hTask )
 700 {
 701     TDB *pCurTask = TASK_GetCurrent();
 702
 703     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 704     {
 705         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 706         return;
 707     }
 708
 709     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 710
 711     pCurTask->hYieldTo = hTask;
 712     OldYield16();
 713
 714     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 715 }
 716
 717 /***********************************************************************
 718  *           Yield16  (KERNEL.29)
 719  */
 720 void WINAPI Yield16(void)
 721 {
 722     TDB *pCurTask = TASK_GetCurrent();
 723
 724     if (pCurTask) pCurTask->hYieldTo = 0;
 725     if (pCurTask && pCurTask->hQueue && Callout.UserYield16) Callout.UserYield16();
 726     else OldYield16();
 727 }
 728
 729 /***********************************************************************
 730  *           KERNEL_490  (KERNEL.490)
 731  */
 732 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 733 {
 734     if ( !someTask ) return 0;
 735
 736     FIXME("(%04x): stub\n", someTask );
 737     return 0;
 738 }
 739
 740 /***********************************************************************
 741  *           MakeProcInstance16  (KERNEL.51)
 742  */
 743 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 744 {
 745     BYTE *thunk,*lfunc;
 746     SEGPTR thunkaddr;
 747     WORD hInstanceSelector;
 748
 749     hInstanceSelector = GlobalHandleToSel16(hInstance);
 750
 751     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 752
 753     if (!HIWORD(func)) {
 754       /* Win95 actually protects via SEH, but this is better for debugging */
 755       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 756       return (FARPROC16)0;
 757     }
 758
 759     if (hInstance)
 760     {
 761         if ( (!(hInstance & 4)) ||
 762              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 763         {
 764             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 765                 hInstance);
 766             return 0;
 767         }
 768     }
 769
 770     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 771       && (hInstance != 0)
 772       && (hInstance != 0xffff) )
 773     {
 774         /* calling MPI with a foreign DSEG is invalid ! */
 775         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 776                    hInstance,CURRENT_DS);
 777     }
 778
 779     /* Always use the DSEG that MPI was entered with.
 780      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 781      * as CURRENT_DS provides the DSEG value we need.
 782      * ("calling" DS, *not* "task" DS !) */
 783     hInstanceSelector = CURRENT_DS;
 784     hInstance = GlobalHandle16(hInstanceSelector);
 785
 786     /* no thunking for DLLs */
 787     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 788         return func;
 789
 790     thunkaddr = TASK_AllocThunk();
 791     if (!thunkaddr) return (FARPROC16)0;
 792     thunk = MapSL( thunkaddr );
 793     lfunc = MapSL( (SEGPTR)func );
 794
 795     TRACE("(%08lx,%04x): got thunk %08lx\n",
 796           (DWORD)func, hInstance, (DWORD)thunkaddr );
 797     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 798         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 799     ) {
 800         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 801     }
 802
 803     *thunk++ = 0xb8;    /* movw instance, %ax */
 804     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 805     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 806     *thunk++ = 0xea;    /* ljmp func */
 807     *(DWORD *)thunk = (DWORD)func;
 808     return (FARPROC16)thunkaddr;
 809     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 810 }
 811
 812
 813 /***********************************************************************
 814  *           FreeProcInstance16  (KERNEL.52)
 815  */
 816 void WINAPI FreeProcInstance16( FARPROC16 func )
 817 {
 818     TRACE("(%08lx)\n", (DWORD)func );
 819     TASK_FreeThunk( (SEGPTR)func );
 820 }
 821
 822 /**********************************************************************
 823  *          TASK_GetCodeSegment
 824  *
 825  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 826  * and logical segment number of a given code segment.
 827  *
 828  * 'proc' either *is* already a pair of module handle and segment number,
 829  * in which case there's nothing to do.  Otherwise, it is a pointer to
 830  * a function, and we need to retrieve the code segment.  If the pointer
 831  * happens to point to a thunk, we'll retrieve info about the code segment
 832  * where the function pointed to by the thunk resides, not the thunk itself.
 833  *
 834  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 835  *        the function the snoop code will return to ...
 836  *
 837  */
 838 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 839                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 840 {
 841     NE_MODULE *pModule = NULL;
 842     SEGTABLEENTRY *pSeg = NULL;
 843     int segNr=0;
 844
 845     /* Try pair of module handle / segment number */
 846     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 847     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 848     {
 849         segNr = LOWORD( proc );
 850         if ( segNr && segNr <= pModule->seg_count )
 851             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 852     }
 853
 854     /* Try thunk or function */
 855     else
 856     {
 857         BYTE *thunk = MapSL( (SEGPTR)proc );
 858         WORD selector;
 859
 860         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 861             selector = thunk[6] + (thunk[7] << 8);
 862         else
 863             selector = HIWORD( proc );
 864
 865         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 866         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 867
 868         if ( pModule )
 869             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 870                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 871                     break;
 872
 873         if ( pModule && segNr > pModule->seg_count )
 874             pSeg = NULL;
 875     }
 876
 877     /* Abort if segment not found */
 878
 879     if ( !pModule || !pSeg )
 880         return FALSE;
 881
 882     /* Return segment data */
 883
 884     if ( ppModule ) *ppModule = pModule;
 885     if ( ppSeg    ) *ppSeg    = pSeg;
 886     if ( pSegNr   ) *pSegNr   = segNr;
 887
 888     return TRUE;
 889 }
 890
 891 /**********************************************************************
 892  *          GetCodeHandle    (KERNEL.93)
 893  */
 894 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 895 {
 896     SEGTABLEENTRY *pSeg;
 897
 898     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 899         return (HANDLE16)0;
 900
 901     return pSeg->hSeg;
 902 }
 903
 904 /**********************************************************************
 905  *          GetCodeInfo    (KERNEL.104)
 906  */
 907 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 908 {
 909     NE_MODULE *pModule;
 910     SEGTABLEENTRY *pSeg;
 911     int segNr;
 912
 913     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 914         return FALSE;
 915
 916     /* Fill in segment information */
 917
 918     segInfo->offSegment = pSeg->filepos;
 919     segInfo->cbSegment  = pSeg->size;
 920     segInfo->flags      = pSeg->flags;
 921     segInfo->cbAlloc    = pSeg->minsize;
 922     segInfo->h          = pSeg->hSeg;
 923     segInfo->alignShift = pModule->alignment;
 924
 925     if ( segNr == pModule->dgroup )
 926         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 927
 928     /* Return module handle in %es */
 929
 930     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 931
 932     return TRUE;
 933 }
 934
 935
 936 /**********************************************************************
 937  *          DefineHandleTable16    (KERNEL.94)
 938  */
 939 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 940 {
 941     FIXME("(%04x): stub ?\n", wOffset);
 942     return TRUE;
 943 }
 944
 945
 946 /***********************************************************************
 947  *           SetTaskQueue  (KERNEL.34)
 948  */
 949 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 950 {
 951     HQUEUE16 hPrev;
 952     TDB *pTask;
 953
 954     if (!hTask) hTask = GetCurrentTask();
 955     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 956
 957     hPrev = pTask->hQueue;
 958     pTask->hQueue = hQueue;
 959
 960     return hPrev;
 961 }
 962
 963
 964 /***********************************************************************
 965  *           GetTaskQueue  (KERNEL.35)
 966  */
 967 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
 968 {
 969     TDB *pTask;
 970
 971     if (!hTask) hTask = GetCurrentTask();
 972     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 973     return pTask->hQueue;
 974 }
 975
 976 /***********************************************************************
 977  *           SetThreadQueue  (KERNEL.463)
 978  */
 979 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
 980 {
 981     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
 982     HQUEUE16 oldQueue = teb? teb->queue : 0;
 983
 984     if ( teb )
 985     {
 986         teb->queue = hQueue;
 987
 988         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
 989             SetTaskQueue16( teb->htask16, hQueue );
 990     }
 991
 992     return oldQueue;
 993 }
 994
 995 /***********************************************************************
 996  *           GetThreadQueue  (KERNEL.464)
 997  */
 998 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
 999 {
1000     TEB *teb = NULL;
1001     if ( !thread )
1002         teb = NtCurrentTeb();
1003     else if ( HIWORD(thread) )
1004         teb = THREAD_IdToTEB( thread );
1005     else if ( IsTask16( (HTASK16)thread ) )
1006         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1007
1008     return (HQUEUE16)(teb? teb->queue : 0);
1009 }
1010
1011 /***********************************************************************
1012  *           SetFastQueue  (KERNEL.624)
1013  */
1014 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1015 {
1016     TEB *teb = NULL;
1017     if ( !thread )
1018         teb = NtCurrentTeb();
1019     else if ( HIWORD(thread) )
1020         teb = THREAD_IdToTEB( thread );
1021     else if ( IsTask16( (HTASK16)thread ) )
1022         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1023
1024     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1025 }
1026
1027 /***********************************************************************
1028  *           GetFastQueue  (KERNEL.625)
1029  */
1030 HANDLE WINAPI GetFastQueue16( void )
1031 {
1032     TEB *teb = NtCurrentTeb();
1033     if (!teb) return 0;
1034
1035     if (!teb->queue)
1036     {
1037         if (!Callout.InitThreadInput16)
1038         {
1039             THUNK_InitCallout();
1040             if (!Callout.InitThreadInput16)
1041             {
1042                 FIXME("InitThreadInput16 callout not found, trouble ahead\n");
1043                 return 0;
1044             }
1045         }
1046         Callout.InitThreadInput16( 0, THREAD_IsWin16(teb)? 4 : 5 );
1047
1048         if (!teb->queue)
1049             FIXME("(): should initialize thread-local queue, expect failure!\n" );
1050     }
1051
1052     return (HANDLE)teb->queue;
1053 }
1054
1055 /***********************************************************************
1056  *           SwitchStackTo   (KERNEL.108)
1057  */
1058 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1059 {
1060     TDB *pTask;
1061     STACK16FRAME *oldFrame, *newFrame;
1062     INSTANCEDATA *pData;
1063     UINT16 copySize;
1064
1065     if (!(pTask = TASK_GetCurrent())) return;
1066     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1067     TRACE("old=%04x:%04x new=%04x:%04x\n",
1068           SELECTOROF( pTask->teb->cur_stack ),
1069           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1070
1071     /* Save the old stack */
1072
1073     oldFrame = THREAD_STACK16( pTask->teb );
1074     /* pop frame + args and push bp */
1075     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1076                            + 2 * sizeof(WORD);
1077     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1078     pData->stacktop    = top;
1079     pData->stackmin    = ptr;
1080     pData->stackbottom = ptr;
1081
1082     /* Switch to the new stack */
1083
1084     /* Note: we need to take the 3 arguments into account; otherwise,
1085      * the stack will underflow upon return from this function.
1086      */
1087     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1088     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1089     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1090     newFrame = THREAD_STACK16( pTask->teb );
1091
1092     /* Copy the stack frame and the local variables to the new stack */
1093
1094     memmove( newFrame, oldFrame, copySize );
1095     newFrame->bp = ptr;
1096     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1097 }
1098
1099
1100 /***********************************************************************
1101  *           SwitchStackBack   (KERNEL.109)
1102  */
1103 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1104 {
1105     STACK16FRAME *oldFrame, *newFrame;
1106     INSTANCEDATA *pData;
1107
1108     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1109         return;
1110     if (!pData->old_ss_sp)
1111     {
1112         WARN("No previous SwitchStackTo\n" );
1113         return;
1114     }
1115     TRACE("restoring stack %04x:%04x\n",
1116           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1117
1118     oldFrame = CURRENT_STACK16;
1119
1120     /* Pop bp from the previous stack */
1121
1122     BP_reg(context) = *(WORD *)MapSL(pData->old_ss_sp);
1123     pData->old_ss_sp += sizeof(WORD);
1124
1125     /* Switch back to the old stack */
1126
1127     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1128     context->SegSs = SELECTOROF(pData->old_ss_sp);
1129     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1130     pData->old_ss_sp = 0;
1131
1132     /* Build a stack frame for the return */
1133
1134     newFrame = CURRENT_STACK16;
1135     newFrame->frame32     = oldFrame->frame32;
1136     newFrame->module_cs   = oldFrame->module_cs;
1137     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1138     newFrame->entry_ip    = oldFrame->entry_ip;
1139 }
1140
1141
1142 /***********************************************************************
1143  *           GetTaskQueueDS16  (KERNEL.118)
1144  */
1145 void WINAPI GetTaskQueueDS16(void)
1146 {
1147     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1148 }
1149
1150
1151 /***********************************************************************
1152  *           GetTaskQueueES16  (KERNEL.119)
1153  */
1154 void WINAPI GetTaskQueueES16(void)
1155 {
1156     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1157 }
1158
1159
1160 /***********************************************************************
1161  *           GetCurrentTask   (KERNEL.36)
1162  */
1163 HTASK16 WINAPI GetCurrentTask(void)
1164 {
1165     return NtCurrentTeb()->htask16;
1166 }
1167
1168 DWORD WINAPI WIN16_GetCurrentTask(void)
1169 {
1170     /* This is the version used by relay code; the first task is */
1171     /* returned in the high word of the result */
1172     return MAKELONG( GetCurrentTask(), hFirstTask );
1173 }
1174
1175
1176 /***********************************************************************
1177  *           GetCurrentPDB   (KERNEL.37)
1178  *
1179  * UNDOC: returns PSP of KERNEL in high word
1180  */
1181 DWORD WINAPI GetCurrentPDB16(void)
1182 {
1183     TDB *pTask;
1184
1185     if (!(pTask = TASK_GetCurrent())) return 0;
1186     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1187 }
1188
1189
1190 /***********************************************************************
1191  *           GetCurPID16   (KERNEL.157)
1192  */
1193 DWORD WINAPI GetCurPID16( DWORD unused )
1194 {
1195     return 0;
1196 }
1197
1198
1199 /***********************************************************************
1200  *           GetInstanceData   (KERNEL.54)
1201  */
1202 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1203 {
1204     char *ptr = (char *)GlobalLock16( instance );
1205     if (!ptr || !len) return 0;
1206     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1207     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1208     return len;
1209 }
1210
1211
1212 /***********************************************************************
1213  *           GetExeVersion   (KERNEL.105)
1214  */
1215 WORD WINAPI GetExeVersion16(void)
1216 {
1217     TDB *pTask;
1218
1219     if (!(pTask = TASK_GetCurrent())) return 0;
1220     return pTask->version;
1221 }
1222
1223
1224 /***********************************************************************
1225  *           SetErrorMode16   (KERNEL.107)
1226  */
1227 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1228 {
1229     TDB *pTask;
1230     if (!(pTask = TASK_GetCurrent())) return 0;
1231     pTask->error_mode = mode;
1232     return SetErrorMode( mode );
1233 }
1234
1235
1236 /***********************************************************************
1237  *           GetNumTasks   (KERNEL.152)
1238  */
1239 UINT16 WINAPI GetNumTasks16(void)
1240 {
1241     return nTaskCount;
1242 }
1243
1244
1245 /***********************************************************************
1246  *           GetTaskDS   (KERNEL.155)
1247  *
1248  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1249  * I don't think we need to bother with this.
1250  */
1251 HINSTANCE16 WINAPI GetTaskDS16(void)
1252 {
1253     TDB *pTask;
1254
1255     if (!(pTask = TASK_GetCurrent())) return 0;
1256     return GlobalHandleToSel16(pTask->hInstance);
1257 }
1258
1259 /***********************************************************************
1260  *           GetDummyModuleHandleDS   (KERNEL.602)
1261  */
1262 WORD WINAPI GetDummyModuleHandleDS16(void)
1263 {
1264     TDB *pTask;
1265     WORD selector;
1266
1267     if (!(pTask = TASK_GetCurrent())) return 0;
1268     if (!(pTask->flags & TDBF_WIN32)) return 0;
1269     selector = GlobalHandleToSel16( pTask->hModule );
1270     CURRENT_DS = selector;
1271     return selector;
1272 }
1273
1274 /***********************************************************************
1275  *           IsTask   (KERNEL.320)
1276  *           IsTask16 (KERNEL32.@)
1277  */
1278 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1279 {
1280     TDB *pTask;
1281
1282     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1283     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1284     return (pTask->magic == TDB_MAGIC);
1285 }
1286
1287
1288 /***********************************************************************
1289  *           IsWinOldApTask16   (KERNEL.158)
1290  */
1291 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1292 {
1293     /* should return bit 0 of byte 0x48 in PSP */
1294     return FALSE;
1295 }
1296
1297 /***********************************************************************
1298  *           SetTaskSignalProc   (KERNEL.38)
1299  */
1300 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1301 {
1302     TDB *pTask;
1303     FARPROC16 oldProc;
1304
1305     if (!hTask) hTask = GetCurrentTask();
1306     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1307     oldProc = pTask->userhandler;
1308     pTask->userhandler = proc;
1309     return oldProc;
1310 }
1311
1312 /***********************************************************************
1313  *           TASK_CallTaskSignalProc
1314  */
1315 /* ### start build ### */
1316 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1317 /* ### stop build ### */
1318 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1319 {
1320     TDB *pTask = TASK_GetCurrent();
1321     if ( !pTask || !pTask->userhandler ) return;
1322
1323     TASK_CallTo16_word_wwwww( pTask->userhandler,
1324                               hTaskOrModule, uCode, 0,
1325                               pTask->hInstance, pTask->hQueue );
1326 }
1327
1328 /***********************************************************************
1329  *           SetSigHandler   (KERNEL.140)
1330  */
1331 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1332                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1333 {
1334     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1335           newhandler,oldhandler,oldmode,newmode,flag );
1336
1337     if (flag != 1) return 0;
1338     if (!newmode) newhandler = NULL;  /* Default handler */
1339     if (newmode != 4)
1340     {
1341         TDB *pTask;
1342
1343         if (!(pTask = TASK_GetCurrent())) return 0;
1344         if (oldmode) *oldmode = pTask->signal_flags;
1345         pTask->signal_flags = newmode;
1346         if (oldhandler) *oldhandler = pTask->sighandler;
1347         pTask->sighandler = newhandler;
1348     }
1349     return 0;
1350 }
1351
1352
1353 /***********************************************************************
1354  *           GlobalNotify   (KERNEL.154)
1355  *
1356  * Note that GlobalNotify does _not_ return the old NotifyProc
1357  * -- contrary to LocalNotify !!
1358  */
1359 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1360 {
1361     TDB *pTask;
1362
1363     if (!(pTask = TASK_GetCurrent())) return;
1364     pTask->discardhandler = proc;
1365 }
1366
1367
1368 /***********************************************************************
1369  *           GetExePtr   (KERNEL.133)
1370  */
1371 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1372 {
1373     char *ptr;
1374     HANDLE16 owner;
1375
1376       /* Check for module handle */
1377
1378     if (!(ptr = GlobalLock16( handle ))) return 0;
1379     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1380
1381       /* Search for this handle inside all tasks */
1382
1383     *hTask = hFirstTask;
1384     while (*hTask)
1385     {
1386         TDB *pTask = TASK_GetPtr( *hTask );
1387         if ((*hTask == handle) ||
1388             (pTask->hInstance == handle) ||
1389             (pTask->hQueue == handle) ||
1390             (pTask->hPDB == handle)) return pTask->hModule;
1391         *hTask = pTask->hNext;
1392     }
1393
1394       /* Check the owner for module handle */
1395
1396     owner = FarGetOwner16( handle );
1397     if (!(ptr = GlobalLock16( owner ))) return 0;
1398     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1399
1400       /* Search for the owner inside all tasks */
1401
1402     *hTask = hFirstTask;
1403     while (*hTask)
1404     {
1405         TDB *pTask = TASK_GetPtr( *hTask );
1406         if ((*hTask == owner) ||
1407             (pTask->hInstance == owner) ||
1408             (pTask->hQueue == owner) ||
1409             (pTask->hPDB == owner)) return pTask->hModule;
1410         *hTask = pTask->hNext;
1411     }
1412
1413     return 0;
1414 }
1415
1416 /**********************************************************************/
1417
1418 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1419 {
1420     HTASK16 hTask = 0;
1421     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1422     STACK16FRAME *frame = CURRENT_STACK16;
1423     frame->ecx = hModule;
1424     if (hTask) frame->es = hTask;
1425     return hModule;
1426 }
1427
1428 /**********************************************************************/
1429
1430 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1431 {
1432     HTASK16 hTask = 0;
1433     return GetExePtrHelper( handle, &hTask );
1434 }
1435
1436
1437 /***********************************************************************
1438  *           TaskFirst   (TOOLHELP.63)
1439  */
1440 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1441 {
1442     lpte->hNext = hFirstTask;
1443     return TaskNext16( lpte );
1444 }
1445
1446
1447 /***********************************************************************
1448  *           TaskNext   (TOOLHELP.64)
1449  */
1450 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1451 {
1452     TDB *pTask;
1453     INSTANCEDATA *pInstData;
1454
1455     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1456     if (!lpte->hNext) return FALSE;
1457
1458     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1459     while (1) {
1460         pTask = TASK_GetPtr( lpte->hNext );
1461         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1462         if (pTask->hInstance)
1463             break;
1464         lpte->hNext = pTask->hNext;
1465     }
1466     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1467     lpte->hTask         = lpte->hNext;
1468     lpte->hTaskParent   = pTask->hParent;
1469     lpte->hInst         = pTask->hInstance;
1470     lpte->hModule       = pTask->hModule;
1471     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1472     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1473     lpte->wStackTop     = pInstData->stacktop;
1474     lpte->wStackMinimum = pInstData->stackmin;
1475     lpte->wStackBottom  = pInstData->stackbottom;
1476     lpte->wcEvents      = pTask->nEvents;
1477     lpte->hQueue        = pTask->hQueue;
1478     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1479     lpte->wPSPOffset    = 0x100;  /*??*/
1480     lpte->hNext         = pTask->hNext;
1481     return TRUE;
1482 }
1483
1484
1485 /***********************************************************************
1486  *           TaskFindHandle   (TOOLHELP.65)
1487  */
1488 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1489 {
1490     lpte->hNext = hTask;
1491     return TaskNext16( lpte );
1492 }
1493
1494
1495 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1496
1497 /**************************************************************************
1498  *           FatalAppExit16   (KERNEL.137)
1499  */
1500 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1501 {
1502     TDB *pTask = TASK_GetCurrent();
1503
1504     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1505     {
1506         HMODULE mod = GetModuleHandleA( "user32.dll" );
1507         if (mod)
1508         {
1509             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1510             if (pMessageBoxA)
1511             {
1512                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1513                 goto done;
1514             }
1515         }
1516         ERR( "%s\n", debugstr_a(str) );
1517     }
1518  done:
1519     ExitThread(0xff);
1520 }
1521
1522
1523 /***********************************************************************
1524  *           TerminateApp16   (TOOLHELP.77)
1525  *
1526  * See "Undocumented Windows".
1527  */
1528 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1529 {
1530     if (hTask && hTask != GetCurrentTask())
1531     {
1532         FIXME("cannot terminate task %x\n", hTask);
1533         return;
1534     }
1535
1536     if (wFlags & NO_UAE_BOX)
1537     {
1538         UINT16 old_mode;
1539         old_mode = SetErrorMode16(0);
1540         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1541     }
1542     FatalAppExit16( 0, NULL );
1543
1544     /* hmm, we're still alive ?? */
1545
1546     /* check undocumented flag */
1547     if (!(wFlags & 0x8000))
1548         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1549
1550     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1551        but let's just call ExitThread */
1552     ExitThread(0xff);
1553 }
1554
1555
1556 /***********************************************************************
1557  *           GetAppCompatFlags16   (KERNEL.354)
1558  */
1559 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1560 {
1561     return GetAppCompatFlags( hTask );
1562 }
1563
1564
1565 /***********************************************************************
1566  *           GetAppCompatFlags   (USER32.206)
1567  */
1568 DWORD WINAPI GetAppCompatFlags( HTASK hTask )
1569 {
1570     TDB *pTask;
1571
1572     if (!hTask) hTask = GetCurrentTask();
1573     if (!(pTask=TASK_GetPtr( (HTASK16)hTask ))) return 0;
1574     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1575     return pTask->compat_flags;
1576 }