loader/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8 #include "wine/port.h"
   9
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <assert.h>
  13 #include <unistd.h>
  14
  15 #include "winbase.h"
  16 #include "wingdi.h"
  17 #include "winnt.h"
  18 #include "winuser.h"
  19
  20 #include "wine/winbase16.h"
  21 #include "drive.h"
  22 #include "file.h"
  23 #include "global.h"
  24 #include "instance.h"
  25 #include "miscemu.h"
  26 #include "module.h"
  27 #include "ntddk.h"
  28 #include "selectors.h"
  29 #include "services.h"
  30 #include "wine/server.h"
  31 #include "syslevel.h"
  32 #include "stackframe.h"
  33 #include "task.h"
  34 #include "thread.h"
  35 #include "toolhelp.h"
  36
  37 #include "debugtools.h"
  38
  39 DEFAULT_DEBUG_CHANNEL(task);
  40 DECLARE_DEBUG_CHANNEL(relay);
  41 DECLARE_DEBUG_CHANNEL(toolhelp);
  42
  43   /* Min. number of thunks allocated when creating a new segment */
  44 #define MIN_THUNKS  32
  45
  46
  47 static THHOOK DefaultThhook;
  48 THHOOK *pThhook = &DefaultThhook;
  49
  50 #define hCurrentTask (pThhook->CurTDB)
  51 #define hFirstTask   (pThhook->HeadTDB)
  52 #define hLockedTask  (pThhook->LockTDB)
  53
  54 static UINT16 nTaskCount = 0;
  55
  56 static HTASK16 initial_task;
  57
  58 /***********************************************************************
  59  *           TASK_InstallTHHook
  60  */
  61 void TASK_InstallTHHook( THHOOK *pNewThhook )
  62 {
  63      THHOOK *pOldThhook = pThhook;
  64
  65      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  66
  67      *pThhook = *pOldThhook;
  68 }
  69
  70 /***********************************************************************
  71  *           TASK_GetNextTask
  72  */
  73 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  74 {
  75     TDB* pTask = TASK_GetPtr( hTask );
  76
  77     if (pTask->hNext) return pTask->hNext;
  78     return (hFirstTask != hTask) ? hFirstTask : 0;
  79 }
  80
  81
  82 /***********************************************************************
  83  *           TASK_GetPtr
  84  */
  85 TDB *TASK_GetPtr( HTASK16 hTask )
  86 {
  87     return GlobalLock16( hTask );
  88 }
  89
  90
  91 /***********************************************************************
  92  *           TASK_GetCurrent
  93  */
  94 TDB *TASK_GetCurrent(void)
  95 {
  96     return TASK_GetPtr( GetCurrentTask() );
  97 }
  98
  99
 100 /***********************************************************************
 101  *           TASK_LinkTask
 102  */
 103 static void TASK_LinkTask( HTASK16 hTask )
 104 {
 105     HTASK16 *prevTask;
 106     TDB *pTask;
 107
 108     if (!(pTask = TASK_GetPtr( hTask ))) return;
 109     prevTask = &hFirstTask;
 110     while (*prevTask)
 111     {
 112         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 113         if (prevTaskPtr->priority >= pTask->priority) break;
 114         prevTask = &prevTaskPtr->hNext;
 115     }
 116     pTask->hNext = *prevTask;
 117     *prevTask = hTask;
 118     nTaskCount++;
 119 }
 120
 121
 122 /***********************************************************************
 123  *           TASK_UnlinkTask
 124  */
 125 static void TASK_UnlinkTask( HTASK16 hTask )
 126 {
 127     HTASK16 *prevTask;
 128     TDB *pTask;
 129
 130     prevTask = &hFirstTask;
 131     while (*prevTask && (*prevTask != hTask))
 132     {
 133         pTask = TASK_GetPtr( *prevTask );
 134         prevTask = &pTask->hNext;
 135     }
 136     if (*prevTask)
 137     {
 138         pTask = TASK_GetPtr( *prevTask );
 139         *prevTask = pTask->hNext;
 140         pTask->hNext = 0;
 141         nTaskCount--;
 142     }
 143 }
 144
 145
 146 /***********************************************************************
 147  *           TASK_CreateThunks
 148  *
 149  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 150  * and containing 'count' entries.
 151  */
 152 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 153 {
 154     int i;
 155     WORD free;
 156     THUNKS *pThunk;
 157
 158     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 159     pThunk->next = 0;
 160     pThunk->magic = THUNK_MAGIC;
 161     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 162     free = pThunk->free;
 163     for (i = 0; i < count-1; i++)
 164     {
 165         free += 8;  /* Offset of next thunk */
 166         pThunk->thunks[4*i] = free;
 167     }
 168     pThunk->thunks[4*i] = 0;  /* Last thunk */
 169 }
 170
 171
 172 /***********************************************************************
 173  *           TASK_AllocThunk
 174  *
 175  * Allocate a thunk for MakeProcInstance().
 176  */
 177 static SEGPTR TASK_AllocThunk(void)
 178 {
 179     TDB *pTask;
 180     THUNKS *pThunk;
 181     WORD sel, base;
 182
 183     if (!(pTask = TASK_GetCurrent())) return 0;
 184     sel = pTask->hCSAlias;
 185     pThunk = &pTask->thunks;
 186     base = (int)pThunk - (int)pTask;
 187     while (!pThunk->free)
 188     {
 189         sel = pThunk->next;
 190         if (!sel)  /* Allocate a new segment */
 191         {
 192             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 193                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 194             if (!sel) return (SEGPTR)0;
 195             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 196             pThunk->next = sel;
 197         }
 198         pThunk = (THUNKS *)GlobalLock16( sel );
 199         base = 0;
 200     }
 201     base += pThunk->free;
 202     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 203     return MAKESEGPTR( sel, base );
 204 }
 205
 206
 207 /***********************************************************************
 208  *           TASK_FreeThunk
 209  *
 210  * Free a MakeProcInstance() thunk.
 211  */
 212 static BOOL TASK_FreeThunk( SEGPTR thunk )
 213 {
 214     TDB *pTask;
 215     THUNKS *pThunk;
 216     WORD sel, base;
 217
 218     if (!(pTask = TASK_GetCurrent())) return 0;
 219     sel = pTask->hCSAlias;
 220     pThunk = &pTask->thunks;
 221     base = (int)pThunk - (int)pTask;
 222     while (sel && (sel != HIWORD(thunk)))
 223     {
 224         sel = pThunk->next;
 225         pThunk = (THUNKS *)GlobalLock16( sel );
 226         base = 0;
 227     }
 228     if (!sel) return FALSE;
 229     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 230     pThunk->free = LOWORD(thunk) - base;
 231     return TRUE;
 232 }
 233
 234
 235 /***********************************************************************
 236  *           TASK_Create
 237  *
 238  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 239  *       to be careful to protect global data structures. We do this
 240  *       by entering the Win16Lock while linking the task into the
 241  *       global task list.
 242  */
 243 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, TEB *teb, LPCSTR cmdline, BYTE len )
 244 {
 245     HTASK16 hTask;
 246     TDB *pTask;
 247     char name[10];
 248
 249       /* Allocate the task structure */
 250
 251     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 252     if (!hTask) return NULL;
 253     pTask = TASK_GetPtr( hTask );
 254     FarSetOwner16( hTask, pModule->self );
 255
 256     /* Fill the task structure */
 257
 258     pTask->hSelf = hTask;
 259
 260     if (teb && teb->tibflags & TEBF_WIN32)
 261     {
 262         pTask->flags        |= TDBF_WIN32;
 263         pTask->hInstance     = pModule->self;
 264         pTask->hPrevInstance = 0;
 265         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 266            in NE_InitProcess */
 267     }
 268
 269     pTask->version       = pModule->expected_version;
 270     pTask->hModule       = pModule->self;
 271     pTask->hParent       = GetCurrentTask();
 272     pTask->magic         = TDB_MAGIC;
 273     pTask->nCmdShow      = cmdShow;
 274     pTask->teb           = teb;
 275     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 276     strcpy( pTask->curdir, "\\" );
 277     lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 278                  sizeof(pTask->curdir) - 1 );
 279
 280       /* Create the thunks block */
 281
 282     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 283
 284       /* Copy the module name */
 285
 286     GetModuleName16( pModule->self, name, sizeof(name) );
 287     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 288
 289       /* Allocate a selector for the PDB */
 290
 291     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 292                                       pModule->self, WINE_LDT_FLAGS_DATA );
 293
 294       /* Fill the PDB */
 295
 296     pTask->pdb.int20 = 0x20cd;
 297     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 298     PUT_UA_DWORD(&pTask->pdb.dispatcher[1],
 299                  (DWORD)GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" ));
 300     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 301     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 302     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 303     pTask->pdb.fileHandlesPtr =
 304         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 305     pTask->pdb.hFileHandles = 0;
 306     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 307     /* FIXME: should we make a copy of the environment? */
 308     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 309     pTask->pdb.nbFiles        = 20;
 310
 311     /* Fill the command line */
 312
 313     if (!cmdline)
 314     {
 315         cmdline = GetCommandLineA();
 316         /* remove the first word (program name) */
 317         if (*cmdline == '"')
 318             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 319         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 320         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 321         len = strlen(cmdline);
 322     }
 323     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 324     pTask->pdb.cmdLine[0] = len;
 325     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 326     /* pTask->pdb.cmdLine[len+1] = 0; */
 327
 328     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 329
 330       /* Get the compatibility flags */
 331
 332     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 333
 334       /* Allocate a code segment alias for the TDB */
 335
 336     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 337                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 338
 339       /* Default DTA overwrites command line */
 340
 341     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 342
 343     /* Create scheduler event for 16-bit tasks */
 344
 345     if ( !(pTask->flags & TDBF_WIN32) )
 346         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 347
 348     /* Enter task handle into thread */
 349
 350     if (teb) teb->htask16 = hTask;
 351     if (!initial_task) initial_task = hTask;
 352
 353     return pTask;
 354 }
 355
 356
 357 /***********************************************************************
 358  *           TASK_DeleteTask
 359  */
 360 static void TASK_DeleteTask( HTASK16 hTask )
 361 {
 362     TDB *pTask;
 363     HGLOBAL16 hPDB;
 364
 365     if (!(pTask = TASK_GetPtr( hTask ))) return;
 366     hPDB = pTask->hPDB;
 367
 368     pTask->magic = 0xdead; /* invalidate signature */
 369
 370     /* Free the selector aliases */
 371
 372     GLOBAL_FreeBlock( pTask->hCSAlias );
 373     GLOBAL_FreeBlock( pTask->hPDB );
 374
 375     /* Free the task module */
 376
 377     FreeModule16( pTask->hModule );
 378
 379     /* Free the task structure itself */
 380
 381     GlobalFree16( hTask );
 382
 383     /* Free all memory used by this task (including the 32-bit stack, */
 384     /* the environment block and the thunk segments). */
 385
 386     GlobalFreeAll16( hPDB );
 387 }
 388
 389
 390 /***********************************************************************
 391  *           TASK_CreateMainTask
 392  *
 393  * Create a task for the main (32-bit) process.
 394  */
 395 void TASK_CreateMainTask(void)
 396 {
 397     TDB *pTask;
 398     STARTUPINFOA startup_info;
 399     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 400
 401     GetStartupInfoA( &startup_info );
 402     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 403     pTask = TASK_Create( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
 404                          cmdShow, NtCurrentTeb(), NULL, 0 );
 405     if (!pTask)
 406     {
 407         ERR("could not create task for main process\n");
 408         ExitProcess(1);
 409     }
 410
 411     /* Add the task to the linked list */
 412     /* (no need to get the win16 lock, we are the only thread at this point) */
 413     TASK_LinkTask( pTask->hSelf );
 414 }
 415
 416
 417 /* startup routine for a new 16-bit thread */
 418 static DWORD CALLBACK task_start( TDB *pTask )
 419 {
 420     DWORD ret;
 421
 422     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 423     NtCurrentTeb()->htask16 = pTask->hSelf;
 424
 425     _EnterWin16Lock();
 426     TASK_LinkTask( pTask->hSelf );
 427     pTask->teb = NtCurrentTeb();
 428     ret = NE_StartTask();
 429     _LeaveWin16Lock();
 430     return ret;
 431 }
 432
 433
 434 /***********************************************************************
 435  *           TASK_SpawnTask
 436  *
 437  * Spawn a new 16-bit task.
 438  */
 439 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 440                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 441 {
 442     TDB *pTask;
 443
 444     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 445     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 446     {
 447         TASK_DeleteTask( pTask->hSelf );
 448         return 0;
 449     }
 450     return pTask->hSelf;
 451 }
 452
 453
 454 /***********************************************************************
 455  *           TASK_ExitTask
 456  */
 457 void TASK_ExitTask(void)
 458 {
 459     TDB *pTask;
 460     DWORD lockCount;
 461
 462     /* Enter the Win16Lock to protect global data structures */
 463     _EnterWin16Lock();
 464
 465     pTask = TASK_GetCurrent();
 466     if ( !pTask )
 467     {
 468         _LeaveWin16Lock();
 469         return;
 470     }
 471
 472     TRACE("Killing task %04x\n", pTask->hSelf );
 473
 474     /* Perform USER cleanup */
 475
 476     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 477     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 478     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 479     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 480
 481     /* Remove the task from the list to be sure we never switch back to it */
 482     TASK_UnlinkTask( pTask->hSelf );
 483
 484     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 485     {
 486         TRACE("this is the last task, exiting\n" );
 487         ExitKernel16();
 488     }
 489
 490     if( nTaskCount )
 491     {
 492         TDB* p = TASK_GetPtr( hFirstTask );
 493         while( p )
 494         {
 495             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 496             p = TASK_GetPtr( p->hNext );
 497         }
 498     }
 499
 500     pTask->nEvents = 0;
 501
 502     if ( hLockedTask == pTask->hSelf )
 503         hLockedTask = 0;
 504
 505     TASK_DeleteTask( pTask->hSelf );
 506
 507     /* ... and completely release the Win16Lock, just in case. */
 508     ReleaseThunkLock( &lockCount );
 509 }
 510
 511
 512 /***********************************************************************
 513  *           InitTask  (KERNEL.91)
 514  *
 515  * Called by the application startup code.
 516  */
 517 void WINAPI InitTask16( CONTEXT86 *context )
 518 {
 519     TDB *pTask;
 520     INSTANCEDATA *pinstance;
 521     SEGPTR ptr;
 522
 523     context->Eax = 0;
 524     if (!(pTask = TASK_GetCurrent())) return;
 525
 526     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 527        as some apps, notably Visual Basic apps, *modify* the heap/stack
 528        size of the instance data segment before calling InitTask() */
 529
 530     /* Initialize the INSTANCEDATA structure */
 531     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 532     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 533     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 534     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 535                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 536
 537     /* Initialize the local heap */
 538     if (LOWORD(context->Ecx))
 539         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 540
 541     /* Initialize implicitly loaded DLLs */
 542     NE_InitializeDLLs( pTask->hModule );
 543     NE_DllProcessAttach( pTask->hModule );
 544
 545     /* Registers on return are:
 546      * ax     1 if OK, 0 on error
 547      * cx     stack limit in bytes
 548      * dx     cmdShow parameter
 549      * si     instance handle of the previous instance
 550      * di     instance handle of the new task
 551      * es:bx  pointer to command line inside PSP
 552      *
 553      * 0 (=%bp) is pushed on the stack
 554      */
 555     ptr = stack16_push( sizeof(WORD) );
 556     *(WORD *)MapSL(ptr) = 0;
 557     context->Esp -= 2;
 558
 559     context->Eax = 1;
 560
 561     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 562     else
 563     {
 564         LPBYTE p = &pTask->pdb.cmdLine[1];
 565         while ((*p == ' ') || (*p == '\t')) p++;
 566         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 567     }
 568     context->Ecx   = pinstance->stacktop;
 569     context->Edx   = pTask->nCmdShow;
 570     context->Esi   = (DWORD)pTask->hPrevInstance;
 571     context->Edi   = (DWORD)pTask->hInstance;
 572     context->SegEs = (WORD)pTask->hPDB;
 573 }
 574
 575
 576 /***********************************************************************
 577  *           WaitEvent  (KERNEL.30)
 578  */
 579 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 580 {
 581     TDB *pTask;
 582
 583     if (!hTask) hTask = GetCurrentTask();
 584     pTask = TASK_GetPtr( hTask );
 585
 586     if (pTask->flags & TDBF_WIN32)
 587     {
 588         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 589         return TRUE;
 590     }
 591
 592     if (pTask->nEvents > 0)
 593     {
 594         pTask->nEvents--;
 595         return FALSE;
 596     }
 597
 598     if (pTask->teb == NtCurrentTeb())
 599     {
 600         DWORD lockCount;
 601
 602         NtResetEvent( pTask->hEvent, NULL );
 603         ReleaseThunkLock( &lockCount );
 604         SYSLEVEL_CheckNotLevel( 1 );
 605         WaitForSingleObject( pTask->hEvent, INFINITE );
 606         RestoreThunkLock( lockCount );
 607         if (pTask->nEvents > 0) pTask->nEvents--;
 608     }
 609     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 610
 611     return TRUE;
 612 }
 613
 614
 615 /***********************************************************************
 616  *           PostEvent  (KERNEL.31)
 617  */
 618 void WINAPI PostEvent16( HTASK16 hTask )
 619 {
 620     TDB *pTask;
 621
 622     if (!hTask) hTask = GetCurrentTask();
 623     if (!(pTask = TASK_GetPtr( hTask ))) return;
 624
 625     if (pTask->flags & TDBF_WIN32)
 626     {
 627         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 628         return;
 629     }
 630
 631     pTask->nEvents++;
 632
 633     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 634 }
 635
 636
 637 /***********************************************************************
 638  *           SetPriority  (KERNEL.32)
 639  */
 640 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 641 {
 642     TDB *pTask;
 643     INT16 newpriority;
 644
 645     if (!hTask) hTask = GetCurrentTask();
 646     if (!(pTask = TASK_GetPtr( hTask ))) return;
 647     newpriority = pTask->priority + delta;
 648     if (newpriority < -32) newpriority = -32;
 649     else if (newpriority > 15) newpriority = 15;
 650
 651     pTask->priority = newpriority + 1;
 652     TASK_UnlinkTask( pTask->hSelf );
 653     TASK_LinkTask( pTask->hSelf );
 654     pTask->priority--;
 655 }
 656
 657
 658 /***********************************************************************
 659  *           LockCurrentTask  (KERNEL.33)
 660  */
 661 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 662 {
 663     if (bLock) hLockedTask = GetCurrentTask();
 664     else hLockedTask = 0;
 665     return hLockedTask;
 666 }
 667
 668
 669 /***********************************************************************
 670  *           IsTaskLocked  (KERNEL.122)
 671  */
 672 HTASK16 WINAPI IsTaskLocked16(void)
 673 {
 674     return hLockedTask;
 675 }
 676
 677
 678 /***********************************************************************
 679  *           OldYield  (KERNEL.117)
 680  */
 681 void WINAPI OldYield16(void)
 682 {
 683    DWORD count;
 684
 685    ReleaseThunkLock(&count);
 686    RestoreThunkLock(count);
 687 }
 688
 689 /***********************************************************************
 690  *           WIN32_OldYield  (KERNEL.447)
 691  */
 692 void WINAPI WIN32_OldYield16(void)
 693 {
 694    DWORD count;
 695
 696    ReleaseThunkLock(&count);
 697    RestoreThunkLock(count);
 698 }
 699
 700 /***********************************************************************
 701  *           DirectedYield  (KERNEL.150)
 702  */
 703 void WINAPI DirectedYield16( HTASK16 hTask )
 704 {
 705     TDB *pCurTask = TASK_GetCurrent();
 706
 707     if (pCurTask->flags & TDBF_WIN32)
 708     {
 709         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 710         return;
 711     }
 712
 713     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 714
 715     pCurTask->hYieldTo = hTask;
 716     OldYield16();
 717
 718     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 719 }
 720
 721 /***********************************************************************
 722  *           Yield  (KERNEL.29)
 723  */
 724 void WINAPI Yield16(void)
 725 {
 726     TDB *pCurTask = TASK_GetCurrent();
 727
 728     if (pCurTask) pCurTask->hYieldTo = 0;
 729     if (pCurTask && pCurTask->hQueue)
 730     {
 731         HMODULE mod = GetModuleHandleA( "user32.dll" );
 732         if (mod)
 733         {
 734             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 735             if (proc)
 736             {
 737                 proc();
 738                 return;
 739             }
 740         }
 741     }
 742     OldYield16();
 743 }
 744
 745 /***********************************************************************
 746  *           KERNEL_490  (KERNEL.490)
 747  */
 748 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 749 {
 750     if ( !someTask ) return 0;
 751
 752     FIXME("(%04x): stub\n", someTask );
 753     return 0;
 754 }
 755
 756 /***********************************************************************
 757  *           MakeProcInstance  (KERNEL.51)
 758  */
 759 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 760 {
 761     BYTE *thunk,*lfunc;
 762     SEGPTR thunkaddr;
 763     WORD hInstanceSelector;
 764
 765     hInstanceSelector = GlobalHandleToSel16(hInstance);
 766
 767     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 768
 769     if (!HIWORD(func)) {
 770       /* Win95 actually protects via SEH, but this is better for debugging */
 771       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 772       return (FARPROC16)0;
 773     }
 774
 775     if (hInstance)
 776     {
 777         if ( (!(hInstance & 4)) ||
 778              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 779         {
 780             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 781                 hInstance);
 782             return 0;
 783         }
 784     }
 785
 786     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 787       && (hInstance != 0)
 788       && (hInstance != 0xffff) )
 789     {
 790         /* calling MPI with a foreign DSEG is invalid ! */
 791         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 792                    hInstance,CURRENT_DS);
 793     }
 794
 795     /* Always use the DSEG that MPI was entered with.
 796      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 797      * as CURRENT_DS provides the DSEG value we need.
 798      * ("calling" DS, *not* "task" DS !) */
 799     hInstanceSelector = CURRENT_DS;
 800     hInstance = GlobalHandle16(hInstanceSelector);
 801
 802     /* no thunking for DLLs */
 803     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 804         return func;
 805
 806     thunkaddr = TASK_AllocThunk();
 807     if (!thunkaddr) return (FARPROC16)0;
 808     thunk = MapSL( thunkaddr );
 809     lfunc = MapSL( (SEGPTR)func );
 810
 811     TRACE("(%08lx,%04x): got thunk %08lx\n",
 812           (DWORD)func, hInstance, (DWORD)thunkaddr );
 813     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 814         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 815     ) {
 816         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 817     }
 818
 819     *thunk++ = 0xb8;    /* movw instance, %ax */
 820     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 821     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 822     *thunk++ = 0xea;    /* ljmp func */
 823     *(DWORD *)thunk = (DWORD)func;
 824     return (FARPROC16)thunkaddr;
 825     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 826 }
 827
 828
 829 /***********************************************************************
 830  *           FreeProcInstance  (KERNEL.52)
 831  */
 832 void WINAPI FreeProcInstance16( FARPROC16 func )
 833 {
 834     TRACE("(%08lx)\n", (DWORD)func );
 835     TASK_FreeThunk( (SEGPTR)func );
 836 }
 837
 838 /**********************************************************************
 839  *          TASK_GetCodeSegment
 840  *
 841  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 842  * and logical segment number of a given code segment.
 843  *
 844  * 'proc' either *is* already a pair of module handle and segment number,
 845  * in which case there's nothing to do.  Otherwise, it is a pointer to
 846  * a function, and we need to retrieve the code segment.  If the pointer
 847  * happens to point to a thunk, we'll retrieve info about the code segment
 848  * where the function pointed to by the thunk resides, not the thunk itself.
 849  *
 850  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 851  *        the function the snoop code will return to ...
 852  *
 853  */
 854 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 855                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 856 {
 857     NE_MODULE *pModule = NULL;
 858     SEGTABLEENTRY *pSeg = NULL;
 859     int segNr=0;
 860
 861     /* Try pair of module handle / segment number */
 862     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 863     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 864     {
 865         segNr = LOWORD( proc );
 866         if ( segNr && segNr <= pModule->seg_count )
 867             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 868     }
 869
 870     /* Try thunk or function */
 871     else
 872     {
 873         BYTE *thunk = MapSL( (SEGPTR)proc );
 874         WORD selector;
 875
 876         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 877             selector = thunk[6] + (thunk[7] << 8);
 878         else
 879             selector = HIWORD( proc );
 880
 881         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 882         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 883
 884         if ( pModule )
 885             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 886                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 887                     break;
 888
 889         if ( pModule && segNr > pModule->seg_count )
 890             pSeg = NULL;
 891     }
 892
 893     /* Abort if segment not found */
 894
 895     if ( !pModule || !pSeg )
 896         return FALSE;
 897
 898     /* Return segment data */
 899
 900     if ( ppModule ) *ppModule = pModule;
 901     if ( ppSeg    ) *ppSeg    = pSeg;
 902     if ( pSegNr   ) *pSegNr   = segNr;
 903
 904     return TRUE;
 905 }
 906
 907 /**********************************************************************
 908  *          GetCodeHandle    (KERNEL.93)
 909  */
 910 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 911 {
 912     SEGTABLEENTRY *pSeg;
 913
 914     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 915         return (HANDLE16)0;
 916
 917     return pSeg->hSeg;
 918 }
 919
 920 /**********************************************************************
 921  *          GetCodeInfo    (KERNEL.104)
 922  */
 923 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 924 {
 925     NE_MODULE *pModule;
 926     SEGTABLEENTRY *pSeg;
 927     int segNr;
 928
 929     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 930         return FALSE;
 931
 932     /* Fill in segment information */
 933
 934     segInfo->offSegment = pSeg->filepos;
 935     segInfo->cbSegment  = pSeg->size;
 936     segInfo->flags      = pSeg->flags;
 937     segInfo->cbAlloc    = pSeg->minsize;
 938     segInfo->h          = pSeg->hSeg;
 939     segInfo->alignShift = pModule->alignment;
 940
 941     if ( segNr == pModule->dgroup )
 942         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 943
 944     /* Return module handle in %es */
 945
 946     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 947
 948     return TRUE;
 949 }
 950
 951
 952 /**********************************************************************
 953  *          DefineHandleTable    (KERNEL.94)
 954  */
 955 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 956 {
 957     FIXME("(%04x): stub ?\n", wOffset);
 958     return TRUE;
 959 }
 960
 961
 962 /***********************************************************************
 963  *           SetTaskQueue  (KERNEL.34)
 964  */
 965 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 966 {
 967     HQUEUE16 hPrev;
 968     TDB *pTask;
 969
 970     if (!hTask) hTask = GetCurrentTask();
 971     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 972
 973     hPrev = pTask->hQueue;
 974     pTask->hQueue = hQueue;
 975
 976     return hPrev;
 977 }
 978
 979
 980 /***********************************************************************
 981  *           GetTaskQueue  (KERNEL.35)
 982  */
 983 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
 984 {
 985     TDB *pTask;
 986
 987     if (!hTask) hTask = GetCurrentTask();
 988     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 989     return pTask->hQueue;
 990 }
 991
 992 /***********************************************************************
 993  *           SetThreadQueue  (KERNEL.463)
 994  */
 995 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
 996 {
 997     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
 998     HQUEUE16 oldQueue = teb? teb->queue : 0;
 999
1000     if ( teb )
1001     {
1002         teb->queue = hQueue;
1003
1004         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1005             SetTaskQueue16( teb->htask16, hQueue );
1006     }
1007
1008     return oldQueue;
1009 }
1010
1011 /***********************************************************************
1012  *           GetThreadQueue  (KERNEL.464)
1013  */
1014 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
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     return (HQUEUE16)(teb? teb->queue : 0);
1025 }
1026
1027 /***********************************************************************
1028  *           SetFastQueue  (KERNEL.624)
1029  */
1030 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1031 {
1032     TEB *teb = NULL;
1033     if ( !thread )
1034         teb = NtCurrentTeb();
1035     else if ( HIWORD(thread) )
1036         teb = THREAD_IdToTEB( thread );
1037     else if ( IsTask16( (HTASK16)thread ) )
1038         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1039
1040     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1041 }
1042
1043 /***********************************************************************
1044  *           GetFastQueue  (KERNEL.625)
1045  */
1046 HANDLE WINAPI GetFastQueue16( void )
1047 {
1048     HANDLE ret = (HANDLE)NtCurrentTeb()->queue;
1049
1050     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1051     return ret;
1052 }
1053
1054 /***********************************************************************
1055  *           SwitchStackTo   (KERNEL.108)
1056  */
1057 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1058 {
1059     TDB *pTask;
1060     STACK16FRAME *oldFrame, *newFrame;
1061     INSTANCEDATA *pData;
1062     UINT16 copySize;
1063
1064     if (!(pTask = TASK_GetCurrent())) return;
1065     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1066     TRACE("old=%04x:%04x new=%04x:%04x\n",
1067           SELECTOROF( pTask->teb->cur_stack ),
1068           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1069
1070     /* Save the old stack */
1071
1072     oldFrame = THREAD_STACK16( pTask->teb );
1073     /* pop frame + args and push bp */
1074     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1075                            + 2 * sizeof(WORD);
1076     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1077     pData->stacktop    = top;
1078     pData->stackmin    = ptr;
1079     pData->stackbottom = ptr;
1080
1081     /* Switch to the new stack */
1082
1083     /* Note: we need to take the 3 arguments into account; otherwise,
1084      * the stack will underflow upon return from this function.
1085      */
1086     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1087     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1088     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1089     newFrame = THREAD_STACK16( pTask->teb );
1090
1091     /* Copy the stack frame and the local variables to the new stack */
1092
1093     memmove( newFrame, oldFrame, copySize );
1094     newFrame->bp = ptr;
1095     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1096 }
1097
1098
1099 /***********************************************************************
1100  *           SwitchStackBack   (KERNEL.109)
1101  */
1102 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1103 {
1104     STACK16FRAME *oldFrame, *newFrame;
1105     INSTANCEDATA *pData;
1106
1107     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1108         return;
1109     if (!pData->old_ss_sp)
1110     {
1111         WARN("No previous SwitchStackTo\n" );
1112         return;
1113     }
1114     TRACE("restoring stack %04x:%04x\n",
1115           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1116
1117     oldFrame = CURRENT_STACK16;
1118
1119     /* Pop bp from the previous stack */
1120
1121     BP_reg(context) = *(WORD *)MapSL(pData->old_ss_sp);
1122     pData->old_ss_sp += sizeof(WORD);
1123
1124     /* Switch back to the old stack */
1125
1126     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1127     context->SegSs = SELECTOROF(pData->old_ss_sp);
1128     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1129     pData->old_ss_sp = 0;
1130
1131     /* Build a stack frame for the return */
1132
1133     newFrame = CURRENT_STACK16;
1134     newFrame->frame32     = oldFrame->frame32;
1135     newFrame->module_cs   = oldFrame->module_cs;
1136     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1137     newFrame->entry_ip    = oldFrame->entry_ip;
1138 }
1139
1140
1141 /***********************************************************************
1142  *           GetTaskQueueDS  (KERNEL.118)
1143  */
1144 void WINAPI GetTaskQueueDS16(void)
1145 {
1146     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1147 }
1148
1149
1150 /***********************************************************************
1151  *           GetTaskQueueES  (KERNEL.119)
1152  */
1153 void WINAPI GetTaskQueueES16(void)
1154 {
1155     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1156 }
1157
1158
1159 /***********************************************************************
1160  *           GetCurrentTask   (KERNEL32.@)
1161  */
1162 HTASK16 WINAPI GetCurrentTask(void)
1163 {
1164     return NtCurrentTeb()->htask16;
1165 }
1166
1167 /***********************************************************************
1168  *           GetCurrentTask   (KERNEL.36)
1169  */
1170 DWORD WINAPI WIN16_GetCurrentTask(void)
1171 {
1172     /* This is the version used by relay code; the first task is */
1173     /* returned in the high word of the result */
1174     return MAKELONG( GetCurrentTask(), hFirstTask );
1175 }
1176
1177
1178 /***********************************************************************
1179  *           GetCurrentPDB   (KERNEL.37)
1180  *
1181  * UNDOC: returns PSP of KERNEL in high word
1182  */
1183 DWORD WINAPI GetCurrentPDB16(void)
1184 {
1185     TDB *pTask;
1186
1187     if (!(pTask = TASK_GetCurrent())) return 0;
1188     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1189 }
1190
1191
1192 /***********************************************************************
1193  *           GetCurPID   (KERNEL.157)
1194  */
1195 DWORD WINAPI GetCurPID16( DWORD unused )
1196 {
1197     return 0;
1198 }
1199
1200
1201 /***********************************************************************
1202  *           GetInstanceData   (KERNEL.54)
1203  */
1204 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1205 {
1206     char *ptr = (char *)GlobalLock16( instance );
1207     if (!ptr || !len) return 0;
1208     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1209     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1210     return len;
1211 }
1212
1213
1214 /***********************************************************************
1215  *           GetExeVersion   (KERNEL.105)
1216  */
1217 WORD WINAPI GetExeVersion16(void)
1218 {
1219     TDB *pTask;
1220
1221     if (!(pTask = TASK_GetCurrent())) return 0;
1222     return pTask->version;
1223 }
1224
1225
1226 /***********************************************************************
1227  *           SetErrorMode   (KERNEL.107)
1228  */
1229 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1230 {
1231     TDB *pTask;
1232     if (!(pTask = TASK_GetCurrent())) return 0;
1233     pTask->error_mode = mode;
1234     return SetErrorMode( mode );
1235 }
1236
1237
1238 /***********************************************************************
1239  *           GetNumTasks   (KERNEL.152)
1240  */
1241 UINT16 WINAPI GetNumTasks16(void)
1242 {
1243     return nTaskCount;
1244 }
1245
1246
1247 /***********************************************************************
1248  *           GetTaskDS   (KERNEL.155)
1249  *
1250  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1251  * I don't think we need to bother with this.
1252  */
1253 HINSTANCE16 WINAPI GetTaskDS16(void)
1254 {
1255     TDB *pTask;
1256
1257     if (!(pTask = TASK_GetCurrent())) return 0;
1258     return GlobalHandleToSel16(pTask->hInstance);
1259 }
1260
1261 /***********************************************************************
1262  *           GetDummyModuleHandleDS   (KERNEL.602)
1263  */
1264 WORD WINAPI GetDummyModuleHandleDS16(void)
1265 {
1266     TDB *pTask;
1267     WORD selector;
1268
1269     if (!(pTask = TASK_GetCurrent())) return 0;
1270     if (!(pTask->flags & TDBF_WIN32)) return 0;
1271     selector = GlobalHandleToSel16( pTask->hModule );
1272     CURRENT_DS = selector;
1273     return selector;
1274 }
1275
1276 /***********************************************************************
1277  *           IsTask   (KERNEL.320)
1278  *           IsTask16 (KERNEL32.@)
1279  */
1280 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1281 {
1282     TDB *pTask;
1283
1284     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1285     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1286     return (pTask->magic == TDB_MAGIC);
1287 }
1288
1289
1290 /***********************************************************************
1291  *           IsWinOldApTask   (KERNEL.158)
1292  */
1293 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1294 {
1295     /* should return bit 0 of byte 0x48 in PSP */
1296     return FALSE;
1297 }
1298
1299 /***********************************************************************
1300  *           SetTaskSignalProc   (KERNEL.38)
1301  */
1302 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1303 {
1304     TDB *pTask;
1305     FARPROC16 oldProc;
1306
1307     if (!hTask) hTask = GetCurrentTask();
1308     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1309     oldProc = pTask->userhandler;
1310     pTask->userhandler = proc;
1311     return oldProc;
1312 }
1313
1314 /***********************************************************************
1315  *           TASK_CallTaskSignalProc
1316  */
1317 /* ### start build ### */
1318 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1319 /* ### stop build ### */
1320 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1321 {
1322     TDB *pTask = TASK_GetCurrent();
1323     if ( !pTask || !pTask->userhandler ) return;
1324
1325     TASK_CallTo16_word_wwwww( pTask->userhandler,
1326                               hTaskOrModule, uCode, 0,
1327                               pTask->hInstance, pTask->hQueue );
1328 }
1329
1330 /***********************************************************************
1331  *           SetSigHandler   (KERNEL.140)
1332  */
1333 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1334                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1335 {
1336     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1337           newhandler,oldhandler,oldmode,newmode,flag );
1338
1339     if (flag != 1) return 0;
1340     if (!newmode) newhandler = NULL;  /* Default handler */
1341     if (newmode != 4)
1342     {
1343         TDB *pTask;
1344
1345         if (!(pTask = TASK_GetCurrent())) return 0;
1346         if (oldmode) *oldmode = pTask->signal_flags;
1347         pTask->signal_flags = newmode;
1348         if (oldhandler) *oldhandler = pTask->sighandler;
1349         pTask->sighandler = newhandler;
1350     }
1351     return 0;
1352 }
1353
1354
1355 /***********************************************************************
1356  *           GlobalNotify   (KERNEL.154)
1357  *
1358  * Note that GlobalNotify does _not_ return the old NotifyProc
1359  * -- contrary to LocalNotify !!
1360  */
1361 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1362 {
1363     TDB *pTask;
1364
1365     if (!(pTask = TASK_GetCurrent())) return;
1366     pTask->discardhandler = proc;
1367 }
1368
1369
1370 /***********************************************************************
1371  *           GetExePtrHelper
1372  */
1373 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1374 {
1375     char *ptr;
1376     HANDLE16 owner;
1377
1378       /* Check for module handle */
1379
1380     if (!(ptr = GlobalLock16( handle ))) return 0;
1381     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1382
1383       /* Search for this handle inside all tasks */
1384
1385     *hTask = hFirstTask;
1386     while (*hTask)
1387     {
1388         TDB *pTask = TASK_GetPtr( *hTask );
1389         if ((*hTask == handle) ||
1390             (pTask->hInstance == handle) ||
1391             (pTask->hQueue == handle) ||
1392             (pTask->hPDB == handle)) return pTask->hModule;
1393         *hTask = pTask->hNext;
1394     }
1395
1396       /* Check the owner for module handle */
1397
1398     owner = FarGetOwner16( handle );
1399     if (!(ptr = GlobalLock16( owner ))) return 0;
1400     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1401
1402       /* Search for the owner inside all tasks */
1403
1404     *hTask = hFirstTask;
1405     while (*hTask)
1406     {
1407         TDB *pTask = TASK_GetPtr( *hTask );
1408         if ((*hTask == owner) ||
1409             (pTask->hInstance == owner) ||
1410             (pTask->hQueue == owner) ||
1411             (pTask->hPDB == owner)) return pTask->hModule;
1412         *hTask = pTask->hNext;
1413     }
1414
1415     return 0;
1416 }
1417
1418 /***********************************************************************
1419  *           GetExePtr   (KERNEL.133)
1420  */
1421 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1422 {
1423     HTASK16 hTask = 0;
1424     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1425     STACK16FRAME *frame = CURRENT_STACK16;
1426     frame->ecx = hModule;
1427     if (hTask) frame->es = hTask;
1428     return hModule;
1429 }
1430
1431
1432 /***********************************************************************
1433  *           K228   (KERNEL.228)
1434  */
1435 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1436 {
1437     HTASK16 hTask = 0;
1438     return GetExePtrHelper( handle, &hTask );
1439 }
1440
1441
1442 /***********************************************************************
1443  *           TaskFirst   (TOOLHELP.63)
1444  */
1445 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1446 {
1447     lpte->hNext = hFirstTask;
1448     return TaskNext16( lpte );
1449 }
1450
1451
1452 /***********************************************************************
1453  *           TaskNext   (TOOLHELP.64)
1454  */
1455 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1456 {
1457     TDB *pTask;
1458     INSTANCEDATA *pInstData;
1459
1460     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1461     if (!lpte->hNext) return FALSE;
1462
1463     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1464     while (1) {
1465         pTask = TASK_GetPtr( lpte->hNext );
1466         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1467         if (pTask->hInstance)
1468             break;
1469         lpte->hNext = pTask->hNext;
1470     }
1471     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1472     lpte->hTask         = lpte->hNext;
1473     lpte->hTaskParent   = pTask->hParent;
1474     lpte->hInst         = pTask->hInstance;
1475     lpte->hModule       = pTask->hModule;
1476     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1477     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1478     lpte->wStackTop     = pInstData->stacktop;
1479     lpte->wStackMinimum = pInstData->stackmin;
1480     lpte->wStackBottom  = pInstData->stackbottom;
1481     lpte->wcEvents      = pTask->nEvents;
1482     lpte->hQueue        = pTask->hQueue;
1483     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1484     lpte->wPSPOffset    = 0x100;  /*??*/
1485     lpte->hNext         = pTask->hNext;
1486     return TRUE;
1487 }
1488
1489
1490 /***********************************************************************
1491  *           TaskFindHandle   (TOOLHELP.65)
1492  */
1493 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1494 {
1495     lpte->hNext = hTask;
1496     return TaskNext16( lpte );
1497 }
1498
1499
1500 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1501
1502 /**************************************************************************
1503  *           FatalAppExit   (KERNEL.137)
1504  */
1505 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1506 {
1507     TDB *pTask = TASK_GetCurrent();
1508
1509     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1510     {
1511         HMODULE mod = GetModuleHandleA( "user32.dll" );
1512         if (mod)
1513         {
1514             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1515             if (pMessageBoxA)
1516             {
1517                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1518                 goto done;
1519             }
1520         }
1521         ERR( "%s\n", debugstr_a(str) );
1522     }
1523  done:
1524     ExitThread(0xff);
1525 }
1526
1527
1528 /***********************************************************************
1529  *           TerminateApp   (TOOLHELP.77)
1530  *
1531  * See "Undocumented Windows".
1532  */
1533 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1534 {
1535     if (hTask && hTask != GetCurrentTask())
1536     {
1537         FIXME("cannot terminate task %x\n", hTask);
1538         return;
1539     }
1540
1541     if (wFlags & NO_UAE_BOX)
1542     {
1543         UINT16 old_mode;
1544         old_mode = SetErrorMode16(0);
1545         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1546     }
1547     FatalAppExit16( 0, NULL );
1548
1549     /* hmm, we're still alive ?? */
1550
1551     /* check undocumented flag */
1552     if (!(wFlags & 0x8000))
1553         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1554
1555     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1556        but let's just call ExitThread */
1557     ExitThread(0xff);
1558 }
1559
1560
1561 /***********************************************************************
1562  *           GetAppCompatFlags   (KERNEL.354)
1563  */
1564 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1565 {
1566     return GetAppCompatFlags( hTask );
1567 }
1568
1569
1570 /***********************************************************************
1571  *           GetAppCompatFlags   (USER32.@)
1572  */
1573 DWORD WINAPI GetAppCompatFlags( HTASK hTask )
1574 {
1575     TDB *pTask;
1576
1577     if (!hTask) hTask = GetCurrentTask();
1578     if (!(pTask=TASK_GetPtr( (HTASK16)hTask ))) return 0;
1579     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1580     return pTask->compat_flags;
1581 }