loader/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <assert.h>
  27 #include <unistd.h>
  28
  29 #include "winbase.h"
  30 #include "wingdi.h"
  31 #include "winnt.h"
  32 #include "winuser.h"
  33
  34 #include "wine/winbase16.h"
  35 #include "drive.h"
  36 #include "file.h"
  37 #include "global.h"
  38 #include "instance.h"
  39 #include "miscemu.h"
  40 #include "module.h"
  41 #include "ntddk.h"
  42 #include "selectors.h"
  43 #include "wine/server.h"
  44 #include "syslevel.h"
  45 #include "stackframe.h"
  46 #include "task.h"
  47 #include "thread.h"
  48 #include "toolhelp.h"
  49
  50 #include "wine/debug.h"
  51
  52 WINE_DEFAULT_DEBUG_CHANNEL(task);
  53 WINE_DECLARE_DEBUG_CHANNEL(relay);
  54 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  55
  56   /* Min. number of thunks allocated when creating a new segment */
  57 #define MIN_THUNKS  32
  58
  59
  60 static THHOOK DefaultThhook;
  61 THHOOK *pThhook = &DefaultThhook;
  62
  63 #define hCurrentTask (pThhook->CurTDB)
  64 #define hFirstTask   (pThhook->HeadTDB)
  65 #define hLockedTask  (pThhook->LockTDB)
  66
  67 static UINT16 nTaskCount = 0;
  68
  69 static HTASK16 initial_task;
  70
  71 /***********************************************************************
  72  *           TASK_InstallTHHook
  73  */
  74 void TASK_InstallTHHook( THHOOK *pNewThhook )
  75 {
  76      THHOOK *pOldThhook = pThhook;
  77
  78      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  79
  80      *pThhook = *pOldThhook;
  81 }
  82
  83 /***********************************************************************
  84  *           TASK_GetNextTask
  85  */
  86 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  87 {
  88     TDB* pTask = TASK_GetPtr( hTask );
  89
  90     if (pTask->hNext) return pTask->hNext;
  91     return (hFirstTask != hTask) ? hFirstTask : 0;
  92 }
  93
  94
  95 /***********************************************************************
  96  *           TASK_GetPtr
  97  */
  98 TDB *TASK_GetPtr( HTASK16 hTask )
  99 {
 100     return GlobalLock16( hTask );
 101 }
 102
 103
 104 /***********************************************************************
 105  *           TASK_GetCurrent
 106  */
 107 TDB *TASK_GetCurrent(void)
 108 {
 109     return TASK_GetPtr( GetCurrentTask() );
 110 }
 111
 112
 113 /***********************************************************************
 114  *           TASK_LinkTask
 115  */
 116 static void TASK_LinkTask( HTASK16 hTask )
 117 {
 118     HTASK16 *prevTask;
 119     TDB *pTask;
 120
 121     if (!(pTask = TASK_GetPtr( hTask ))) return;
 122     prevTask = &hFirstTask;
 123     while (*prevTask)
 124     {
 125         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 126         if (prevTaskPtr->priority >= pTask->priority) break;
 127         prevTask = &prevTaskPtr->hNext;
 128     }
 129     pTask->hNext = *prevTask;
 130     *prevTask = hTask;
 131     nTaskCount++;
 132 }
 133
 134
 135 /***********************************************************************
 136  *           TASK_UnlinkTask
 137  */
 138 static void TASK_UnlinkTask( HTASK16 hTask )
 139 {
 140     HTASK16 *prevTask;
 141     TDB *pTask;
 142
 143     prevTask = &hFirstTask;
 144     while (*prevTask && (*prevTask != hTask))
 145     {
 146         pTask = TASK_GetPtr( *prevTask );
 147         prevTask = &pTask->hNext;
 148     }
 149     if (*prevTask)
 150     {
 151         pTask = TASK_GetPtr( *prevTask );
 152         *prevTask = pTask->hNext;
 153         pTask->hNext = 0;
 154         nTaskCount--;
 155     }
 156 }
 157
 158
 159 /***********************************************************************
 160  *           TASK_CreateThunks
 161  *
 162  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 163  * and containing 'count' entries.
 164  */
 165 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 166 {
 167     int i;
 168     WORD free;
 169     THUNKS *pThunk;
 170
 171     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 172     pThunk->next = 0;
 173     pThunk->magic = THUNK_MAGIC;
 174     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 175     free = pThunk->free;
 176     for (i = 0; i < count-1; i++)
 177     {
 178         free += 8;  /* Offset of next thunk */
 179         pThunk->thunks[4*i] = free;
 180     }
 181     pThunk->thunks[4*i] = 0;  /* Last thunk */
 182 }
 183
 184
 185 /***********************************************************************
 186  *           TASK_AllocThunk
 187  *
 188  * Allocate a thunk for MakeProcInstance().
 189  */
 190 static SEGPTR TASK_AllocThunk(void)
 191 {
 192     TDB *pTask;
 193     THUNKS *pThunk;
 194     WORD sel, base;
 195
 196     if (!(pTask = TASK_GetCurrent())) return 0;
 197     sel = pTask->hCSAlias;
 198     pThunk = &pTask->thunks;
 199     base = (int)pThunk - (int)pTask;
 200     while (!pThunk->free)
 201     {
 202         sel = pThunk->next;
 203         if (!sel)  /* Allocate a new segment */
 204         {
 205             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 206                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 207             if (!sel) return (SEGPTR)0;
 208             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 209             pThunk->next = sel;
 210         }
 211         pThunk = (THUNKS *)GlobalLock16( sel );
 212         base = 0;
 213     }
 214     base += pThunk->free;
 215     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 216     return MAKESEGPTR( sel, base );
 217 }
 218
 219
 220 /***********************************************************************
 221  *           TASK_FreeThunk
 222  *
 223  * Free a MakeProcInstance() thunk.
 224  */
 225 static BOOL TASK_FreeThunk( SEGPTR thunk )
 226 {
 227     TDB *pTask;
 228     THUNKS *pThunk;
 229     WORD sel, base;
 230
 231     if (!(pTask = TASK_GetCurrent())) return 0;
 232     sel = pTask->hCSAlias;
 233     pThunk = &pTask->thunks;
 234     base = (int)pThunk - (int)pTask;
 235     while (sel && (sel != HIWORD(thunk)))
 236     {
 237         sel = pThunk->next;
 238         pThunk = (THUNKS *)GlobalLock16( sel );
 239         base = 0;
 240     }
 241     if (!sel) return FALSE;
 242     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 243     pThunk->free = LOWORD(thunk) - base;
 244     return TRUE;
 245 }
 246
 247
 248 /***********************************************************************
 249  *           TASK_Create
 250  *
 251  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 252  *       to be careful to protect global data structures. We do this
 253  *       by entering the Win16Lock while linking the task into the
 254  *       global task list.
 255  */
 256 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, TEB *teb, LPCSTR cmdline, BYTE len )
 257 {
 258     HTASK16 hTask;
 259     TDB *pTask;
 260     char name[10];
 261     FARPROC16 proc;
 262
 263       /* Allocate the task structure */
 264
 265     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 266     if (!hTask) return NULL;
 267     pTask = TASK_GetPtr( hTask );
 268     FarSetOwner16( hTask, pModule->self );
 269
 270     /* Fill the task structure */
 271
 272     pTask->hSelf = hTask;
 273
 274     if (teb && teb->tibflags & TEBF_WIN32)
 275     {
 276         pTask->flags        |= TDBF_WIN32;
 277         pTask->hInstance     = pModule->self;
 278         pTask->hPrevInstance = 0;
 279         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 280            in NE_InitProcess */
 281     }
 282
 283     pTask->version       = pModule->expected_version;
 284     pTask->hModule       = pModule->self;
 285     pTask->hParent       = GetCurrentTask();
 286     pTask->magic         = TDB_MAGIC;
 287     pTask->nCmdShow      = cmdShow;
 288     pTask->teb           = teb;
 289     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 290     strcpy( pTask->curdir, "\\" );
 291     lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 292                  sizeof(pTask->curdir) - 1 );
 293
 294       /* Create the thunks block */
 295
 296     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 297
 298       /* Copy the module name */
 299
 300     GetModuleName16( pModule->self, name, sizeof(name) );
 301     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 302
 303       /* Allocate a selector for the PDB */
 304
 305     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 306                                       pModule->self, WINE_LDT_FLAGS_DATA );
 307
 308       /* Fill the PDB */
 309
 310     pTask->pdb.int20 = 0x20cd;
 311     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 312     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 313     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 314     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 315     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 316     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 317     pTask->pdb.fileHandlesPtr =
 318         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 319     pTask->pdb.hFileHandles = 0;
 320     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 321     /* FIXME: should we make a copy of the environment? */
 322     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 323     pTask->pdb.nbFiles        = 20;
 324
 325     /* Fill the command line */
 326
 327     if (!cmdline)
 328     {
 329         cmdline = GetCommandLineA();
 330         /* remove the first word (program name) */
 331         if (*cmdline == '"')
 332             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 333         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 334         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 335         len = strlen(cmdline);
 336     }
 337     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 338     pTask->pdb.cmdLine[0] = len;
 339     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 340     /* pTask->pdb.cmdLine[len+1] = 0; */
 341
 342     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 343
 344       /* Get the compatibility flags */
 345
 346     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 347
 348       /* Allocate a code segment alias for the TDB */
 349
 350     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 351                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 352
 353       /* Default DTA overwrites command line */
 354
 355     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 356
 357     /* Create scheduler event for 16-bit tasks */
 358
 359     if ( !(pTask->flags & TDBF_WIN32) )
 360         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 361
 362     /* Enter task handle into thread */
 363
 364     if (teb) teb->htask16 = hTask;
 365     if (!initial_task) initial_task = hTask;
 366
 367     return pTask;
 368 }
 369
 370
 371 /***********************************************************************
 372  *           TASK_DeleteTask
 373  */
 374 static void TASK_DeleteTask( HTASK16 hTask )
 375 {
 376     TDB *pTask;
 377     HGLOBAL16 hPDB;
 378
 379     if (!(pTask = TASK_GetPtr( hTask ))) return;
 380     hPDB = pTask->hPDB;
 381
 382     pTask->magic = 0xdead; /* invalidate signature */
 383
 384     /* Free the selector aliases */
 385
 386     GLOBAL_FreeBlock( pTask->hCSAlias );
 387     GLOBAL_FreeBlock( pTask->hPDB );
 388
 389     /* Free the task module */
 390
 391     FreeModule16( pTask->hModule );
 392
 393     /* Free the task structure itself */
 394
 395     GlobalFree16( hTask );
 396
 397     /* Free all memory used by this task (including the 32-bit stack, */
 398     /* the environment block and the thunk segments). */
 399
 400     GlobalFreeAll16( hPDB );
 401 }
 402
 403
 404 /***********************************************************************
 405  *           TASK_CreateMainTask
 406  *
 407  * Create a task for the main (32-bit) process.
 408  */
 409 void TASK_CreateMainTask(void)
 410 {
 411     TDB *pTask;
 412     STARTUPINFOA startup_info;
 413     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 414
 415     GetStartupInfoA( &startup_info );
 416     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 417     pTask = TASK_Create( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
 418                          cmdShow, NtCurrentTeb(), NULL, 0 );
 419     if (!pTask)
 420     {
 421         ERR("could not create task for main process\n");
 422         ExitProcess(1);
 423     }
 424
 425     /* Add the task to the linked list */
 426     /* (no need to get the win16 lock, we are the only thread at this point) */
 427     TASK_LinkTask( pTask->hSelf );
 428 }
 429
 430
 431 /* startup routine for a new 16-bit thread */
 432 static DWORD CALLBACK task_start( TDB *pTask )
 433 {
 434     DWORD ret;
 435
 436     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 437     NtCurrentTeb()->htask16 = pTask->hSelf;
 438
 439     _EnterWin16Lock();
 440     TASK_LinkTask( pTask->hSelf );
 441     pTask->teb = NtCurrentTeb();
 442     ret = NE_StartTask();
 443     _LeaveWin16Lock();
 444     return ret;
 445 }
 446
 447
 448 /***********************************************************************
 449  *           TASK_SpawnTask
 450  *
 451  * Spawn a new 16-bit task.
 452  */
 453 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 454                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 455 {
 456     TDB *pTask;
 457
 458     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 459     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 460     {
 461         TASK_DeleteTask( pTask->hSelf );
 462         return 0;
 463     }
 464     return pTask->hSelf;
 465 }
 466
 467
 468 /***********************************************************************
 469  *           TASK_ExitTask
 470  */
 471 void TASK_ExitTask(void)
 472 {
 473     TDB *pTask;
 474     DWORD lockCount;
 475
 476     /* Enter the Win16Lock to protect global data structures */
 477     _EnterWin16Lock();
 478
 479     pTask = TASK_GetCurrent();
 480     if ( !pTask )
 481     {
 482         _LeaveWin16Lock();
 483         return;
 484     }
 485
 486     TRACE("Killing task %04x\n", pTask->hSelf );
 487
 488     /* Perform USER cleanup */
 489
 490     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 491     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 492     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 493     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 494
 495     /* Remove the task from the list to be sure we never switch back to it */
 496     TASK_UnlinkTask( pTask->hSelf );
 497
 498     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 499     {
 500         TRACE("this is the last task, exiting\n" );
 501         ExitKernel16();
 502     }
 503
 504     if( nTaskCount )
 505     {
 506         TDB* p = TASK_GetPtr( hFirstTask );
 507         while( p )
 508         {
 509             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 510             p = TASK_GetPtr( p->hNext );
 511         }
 512     }
 513
 514     pTask->nEvents = 0;
 515
 516     if ( hLockedTask == pTask->hSelf )
 517         hLockedTask = 0;
 518
 519     TASK_DeleteTask( pTask->hSelf );
 520
 521     /* ... and completely release the Win16Lock, just in case. */
 522     ReleaseThunkLock( &lockCount );
 523 }
 524
 525
 526 /***********************************************************************
 527  *           InitTask  (KERNEL.91)
 528  *
 529  * Called by the application startup code.
 530  */
 531 void WINAPI InitTask16( CONTEXT86 *context )
 532 {
 533     TDB *pTask;
 534     INSTANCEDATA *pinstance;
 535     SEGPTR ptr;
 536
 537     context->Eax = 0;
 538     if (!(pTask = TASK_GetCurrent())) return;
 539
 540     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 541        as some apps, notably Visual Basic apps, *modify* the heap/stack
 542        size of the instance data segment before calling InitTask() */
 543
 544     /* Initialize the INSTANCEDATA structure */
 545     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 546     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 547     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 548     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 549                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 550
 551     /* Initialize the local heap */
 552     if (LOWORD(context->Ecx))
 553         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 554
 555     /* Initialize implicitly loaded DLLs */
 556     NE_InitializeDLLs( pTask->hModule );
 557     NE_DllProcessAttach( pTask->hModule );
 558
 559     /* Registers on return are:
 560      * ax     1 if OK, 0 on error
 561      * cx     stack limit in bytes
 562      * dx     cmdShow parameter
 563      * si     instance handle of the previous instance
 564      * di     instance handle of the new task
 565      * es:bx  pointer to command line inside PSP
 566      *
 567      * 0 (=%bp) is pushed on the stack
 568      */
 569     ptr = stack16_push( sizeof(WORD) );
 570     *(WORD *)MapSL(ptr) = 0;
 571     context->Esp -= 2;
 572
 573     context->Eax = 1;
 574
 575     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 576     else
 577     {
 578         LPBYTE p = &pTask->pdb.cmdLine[1];
 579         while ((*p == ' ') || (*p == '\t')) p++;
 580         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 581     }
 582     context->Ecx   = pinstance->stacktop;
 583     context->Edx   = pTask->nCmdShow;
 584     context->Esi   = (DWORD)pTask->hPrevInstance;
 585     context->Edi   = (DWORD)pTask->hInstance;
 586     context->SegEs = (WORD)pTask->hPDB;
 587 }
 588
 589
 590 /***********************************************************************
 591  *           WaitEvent  (KERNEL.30)
 592  */
 593 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 594 {
 595     TDB *pTask;
 596
 597     if (!hTask) hTask = GetCurrentTask();
 598     pTask = TASK_GetPtr( hTask );
 599
 600     if (pTask->flags & TDBF_WIN32)
 601     {
 602         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 603         return TRUE;
 604     }
 605
 606     if (pTask->nEvents > 0)
 607     {
 608         pTask->nEvents--;
 609         return FALSE;
 610     }
 611
 612     if (pTask->teb == NtCurrentTeb())
 613     {
 614         DWORD lockCount;
 615
 616         NtResetEvent( pTask->hEvent, NULL );
 617         ReleaseThunkLock( &lockCount );
 618         SYSLEVEL_CheckNotLevel( 1 );
 619         WaitForSingleObject( pTask->hEvent, INFINITE );
 620         RestoreThunkLock( lockCount );
 621         if (pTask->nEvents > 0) pTask->nEvents--;
 622     }
 623     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 624
 625     return TRUE;
 626 }
 627
 628
 629 /***********************************************************************
 630  *           PostEvent  (KERNEL.31)
 631  */
 632 void WINAPI PostEvent16( HTASK16 hTask )
 633 {
 634     TDB *pTask;
 635
 636     if (!hTask) hTask = GetCurrentTask();
 637     if (!(pTask = TASK_GetPtr( hTask ))) return;
 638
 639     if (pTask->flags & TDBF_WIN32)
 640     {
 641         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 642         return;
 643     }
 644
 645     pTask->nEvents++;
 646
 647     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 648 }
 649
 650
 651 /***********************************************************************
 652  *           SetPriority  (KERNEL.32)
 653  */
 654 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 655 {
 656     TDB *pTask;
 657     INT16 newpriority;
 658
 659     if (!hTask) hTask = GetCurrentTask();
 660     if (!(pTask = TASK_GetPtr( hTask ))) return;
 661     newpriority = pTask->priority + delta;
 662     if (newpriority < -32) newpriority = -32;
 663     else if (newpriority > 15) newpriority = 15;
 664
 665     pTask->priority = newpriority + 1;
 666     TASK_UnlinkTask( pTask->hSelf );
 667     TASK_LinkTask( pTask->hSelf );
 668     pTask->priority--;
 669 }
 670
 671
 672 /***********************************************************************
 673  *           LockCurrentTask  (KERNEL.33)
 674  */
 675 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 676 {
 677     if (bLock) hLockedTask = GetCurrentTask();
 678     else hLockedTask = 0;
 679     return hLockedTask;
 680 }
 681
 682
 683 /***********************************************************************
 684  *           IsTaskLocked  (KERNEL.122)
 685  */
 686 HTASK16 WINAPI IsTaskLocked16(void)
 687 {
 688     return hLockedTask;
 689 }
 690
 691
 692 /***********************************************************************
 693  *           OldYield  (KERNEL.117)
 694  */
 695 void WINAPI OldYield16(void)
 696 {
 697    DWORD count;
 698
 699    ReleaseThunkLock(&count);
 700    RestoreThunkLock(count);
 701 }
 702
 703 /***********************************************************************
 704  *           WIN32_OldYield  (KERNEL.447)
 705  */
 706 void WINAPI WIN32_OldYield16(void)
 707 {
 708    DWORD count;
 709
 710    ReleaseThunkLock(&count);
 711    RestoreThunkLock(count);
 712 }
 713
 714 /***********************************************************************
 715  *           DirectedYield  (KERNEL.150)
 716  */
 717 void WINAPI DirectedYield16( HTASK16 hTask )
 718 {
 719     TDB *pCurTask = TASK_GetCurrent();
 720
 721     if (pCurTask->flags & TDBF_WIN32)
 722     {
 723         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 724         return;
 725     }
 726
 727     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 728
 729     pCurTask->hYieldTo = hTask;
 730     OldYield16();
 731
 732     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 733 }
 734
 735 /***********************************************************************
 736  *           Yield  (KERNEL.29)
 737  */
 738 void WINAPI Yield16(void)
 739 {
 740     TDB *pCurTask = TASK_GetCurrent();
 741
 742     if (pCurTask) pCurTask->hYieldTo = 0;
 743     if (pCurTask && pCurTask->hQueue)
 744     {
 745         HMODULE mod = GetModuleHandleA( "user32.dll" );
 746         if (mod)
 747         {
 748             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 749             if (proc)
 750             {
 751                 proc();
 752                 return;
 753             }
 754         }
 755     }
 756     OldYield16();
 757 }
 758
 759 /***********************************************************************
 760  *           KERNEL_490  (KERNEL.490)
 761  */
 762 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 763 {
 764     if ( !someTask ) return 0;
 765
 766     FIXME("(%04x): stub\n", someTask );
 767     return 0;
 768 }
 769
 770 /***********************************************************************
 771  *           MakeProcInstance  (KERNEL.51)
 772  */
 773 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 774 {
 775     BYTE *thunk,*lfunc;
 776     SEGPTR thunkaddr;
 777     WORD hInstanceSelector;
 778
 779     hInstanceSelector = GlobalHandleToSel16(hInstance);
 780
 781     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 782
 783     if (!HIWORD(func)) {
 784       /* Win95 actually protects via SEH, but this is better for debugging */
 785       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 786       return (FARPROC16)0;
 787     }
 788
 789     if (hInstance)
 790     {
 791         if ( (!(hInstance & 4)) ||
 792              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 793         {
 794             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 795                 hInstance);
 796             return 0;
 797         }
 798     }
 799
 800     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 801       && (hInstance != 0)
 802       && (hInstance != 0xffff) )
 803     {
 804         /* calling MPI with a foreign DSEG is invalid ! */
 805         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 806                    hInstance,CURRENT_DS);
 807     }
 808
 809     /* Always use the DSEG that MPI was entered with.
 810      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 811      * as CURRENT_DS provides the DSEG value we need.
 812      * ("calling" DS, *not* "task" DS !) */
 813     hInstanceSelector = CURRENT_DS;
 814     hInstance = GlobalHandle16(hInstanceSelector);
 815
 816     /* no thunking for DLLs */
 817     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 818         return func;
 819
 820     thunkaddr = TASK_AllocThunk();
 821     if (!thunkaddr) return (FARPROC16)0;
 822     thunk = MapSL( thunkaddr );
 823     lfunc = MapSL( (SEGPTR)func );
 824
 825     TRACE("(%08lx,%04x): got thunk %08lx\n",
 826           (DWORD)func, hInstance, (DWORD)thunkaddr );
 827     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 828         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 829     ) {
 830         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 831     }
 832
 833     *thunk++ = 0xb8;    /* movw instance, %ax */
 834     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 835     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 836     *thunk++ = 0xea;    /* ljmp func */
 837     *(DWORD *)thunk = (DWORD)func;
 838     return (FARPROC16)thunkaddr;
 839     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 840 }
 841
 842
 843 /***********************************************************************
 844  *           FreeProcInstance  (KERNEL.52)
 845  */
 846 void WINAPI FreeProcInstance16( FARPROC16 func )
 847 {
 848     TRACE("(%08lx)\n", (DWORD)func );
 849     TASK_FreeThunk( (SEGPTR)func );
 850 }
 851
 852 /**********************************************************************
 853  *          TASK_GetCodeSegment
 854  *
 855  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 856  * and logical segment number of a given code segment.
 857  *
 858  * 'proc' either *is* already a pair of module handle and segment number,
 859  * in which case there's nothing to do.  Otherwise, it is a pointer to
 860  * a function, and we need to retrieve the code segment.  If the pointer
 861  * happens to point to a thunk, we'll retrieve info about the code segment
 862  * where the function pointed to by the thunk resides, not the thunk itself.
 863  *
 864  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 865  *        the function the snoop code will return to ...
 866  *
 867  */
 868 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 869                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 870 {
 871     NE_MODULE *pModule = NULL;
 872     SEGTABLEENTRY *pSeg = NULL;
 873     int segNr=0;
 874
 875     /* Try pair of module handle / segment number */
 876     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 877     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 878     {
 879         segNr = LOWORD( proc );
 880         if ( segNr && segNr <= pModule->seg_count )
 881             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 882     }
 883
 884     /* Try thunk or function */
 885     else
 886     {
 887         BYTE *thunk = MapSL( (SEGPTR)proc );
 888         WORD selector;
 889
 890         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 891             selector = thunk[6] + (thunk[7] << 8);
 892         else
 893             selector = HIWORD( proc );
 894
 895         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 896         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 897
 898         if ( pModule )
 899             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 900                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 901                     break;
 902
 903         if ( pModule && segNr > pModule->seg_count )
 904             pSeg = NULL;
 905     }
 906
 907     /* Abort if segment not found */
 908
 909     if ( !pModule || !pSeg )
 910         return FALSE;
 911
 912     /* Return segment data */
 913
 914     if ( ppModule ) *ppModule = pModule;
 915     if ( ppSeg    ) *ppSeg    = pSeg;
 916     if ( pSegNr   ) *pSegNr   = segNr;
 917
 918     return TRUE;
 919 }
 920
 921 /**********************************************************************
 922  *          GetCodeHandle    (KERNEL.93)
 923  */
 924 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 925 {
 926     SEGTABLEENTRY *pSeg;
 927
 928     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 929         return (HANDLE16)0;
 930
 931     return pSeg->hSeg;
 932 }
 933
 934 /**********************************************************************
 935  *          GetCodeInfo    (KERNEL.104)
 936  */
 937 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 938 {
 939     NE_MODULE *pModule;
 940     SEGTABLEENTRY *pSeg;
 941     int segNr;
 942
 943     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 944         return FALSE;
 945
 946     /* Fill in segment information */
 947
 948     segInfo->offSegment = pSeg->filepos;
 949     segInfo->cbSegment  = pSeg->size;
 950     segInfo->flags      = pSeg->flags;
 951     segInfo->cbAlloc    = pSeg->minsize;
 952     segInfo->h          = pSeg->hSeg;
 953     segInfo->alignShift = pModule->alignment;
 954
 955     if ( segNr == pModule->dgroup )
 956         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 957
 958     /* Return module handle in %es */
 959
 960     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 961
 962     return TRUE;
 963 }
 964
 965
 966 /**********************************************************************
 967  *          DefineHandleTable    (KERNEL.94)
 968  */
 969 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 970 {
 971     FIXME("(%04x): stub ?\n", wOffset);
 972     return TRUE;
 973 }
 974
 975
 976 /***********************************************************************
 977  *           SetTaskQueue  (KERNEL.34)
 978  */
 979 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 980 {
 981     HQUEUE16 hPrev;
 982     TDB *pTask;
 983
 984     if (!hTask) hTask = GetCurrentTask();
 985     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 986
 987     hPrev = pTask->hQueue;
 988     pTask->hQueue = hQueue;
 989
 990     return hPrev;
 991 }
 992
 993
 994 /***********************************************************************
 995  *           GetTaskQueue  (KERNEL.35)
 996  */
 997 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
 998 {
 999     TDB *pTask;
1000
1001     if (!hTask) hTask = GetCurrentTask();
1002     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1003     return pTask->hQueue;
1004 }
1005
1006 /***********************************************************************
1007  *           SetThreadQueue  (KERNEL.463)
1008  */
1009 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1010 {
1011     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1012     HQUEUE16 oldQueue = teb? teb->queue : 0;
1013
1014     if ( teb )
1015     {
1016         teb->queue = hQueue;
1017
1018         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1019             SetTaskQueue16( teb->htask16, hQueue );
1020     }
1021
1022     return oldQueue;
1023 }
1024
1025 /***********************************************************************
1026  *           GetThreadQueue  (KERNEL.464)
1027  */
1028 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1029 {
1030     TEB *teb = NULL;
1031     if ( !thread )
1032         teb = NtCurrentTeb();
1033     else if ( HIWORD(thread) )
1034         teb = THREAD_IdToTEB( thread );
1035     else if ( IsTask16( (HTASK16)thread ) )
1036         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1037
1038     return (HQUEUE16)(teb? teb->queue : 0);
1039 }
1040
1041 /***********************************************************************
1042  *           SetFastQueue  (KERNEL.624)
1043  */
1044 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1045 {
1046     TEB *teb = NULL;
1047     if ( !thread )
1048         teb = NtCurrentTeb();
1049     else if ( HIWORD(thread) )
1050         teb = THREAD_IdToTEB( thread );
1051     else if ( IsTask16( (HTASK16)thread ) )
1052         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1053
1054     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1055 }
1056
1057 /***********************************************************************
1058  *           GetFastQueue  (KERNEL.625)
1059  */
1060 HANDLE WINAPI GetFastQueue16( void )
1061 {
1062     HANDLE ret = (HANDLE)NtCurrentTeb()->queue;
1063
1064     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1065     return ret;
1066 }
1067
1068 /***********************************************************************
1069  *           SwitchStackTo   (KERNEL.108)
1070  */
1071 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1072 {
1073     TDB *pTask;
1074     STACK16FRAME *oldFrame, *newFrame;
1075     INSTANCEDATA *pData;
1076     UINT16 copySize;
1077
1078     if (!(pTask = TASK_GetCurrent())) return;
1079     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1080     TRACE("old=%04x:%04x new=%04x:%04x\n",
1081           SELECTOROF( pTask->teb->cur_stack ),
1082           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1083
1084     /* Save the old stack */
1085
1086     oldFrame = THREAD_STACK16( pTask->teb );
1087     /* pop frame + args and push bp */
1088     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1089                            + 2 * sizeof(WORD);
1090     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1091     pData->stacktop    = top;
1092     pData->stackmin    = ptr;
1093     pData->stackbottom = ptr;
1094
1095     /* Switch to the new stack */
1096
1097     /* Note: we need to take the 3 arguments into account; otherwise,
1098      * the stack will underflow upon return from this function.
1099      */
1100     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1101     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1102     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1103     newFrame = THREAD_STACK16( pTask->teb );
1104
1105     /* Copy the stack frame and the local variables to the new stack */
1106
1107     memmove( newFrame, oldFrame, copySize );
1108     newFrame->bp = ptr;
1109     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1110 }
1111
1112
1113 /***********************************************************************
1114  *           SwitchStackBack   (KERNEL.109)
1115  */
1116 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1117 {
1118     STACK16FRAME *oldFrame, *newFrame;
1119     INSTANCEDATA *pData;
1120
1121     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1122         return;
1123     if (!pData->old_ss_sp)
1124     {
1125         WARN("No previous SwitchStackTo\n" );
1126         return;
1127     }
1128     TRACE("restoring stack %04x:%04x\n",
1129           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1130
1131     oldFrame = CURRENT_STACK16;
1132
1133     /* Pop bp from the previous stack */
1134
1135     BP_reg(context) = *(WORD *)MapSL(pData->old_ss_sp);
1136     pData->old_ss_sp += sizeof(WORD);
1137
1138     /* Switch back to the old stack */
1139
1140     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1141     context->SegSs = SELECTOROF(pData->old_ss_sp);
1142     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1143     pData->old_ss_sp = 0;
1144
1145     /* Build a stack frame for the return */
1146
1147     newFrame = CURRENT_STACK16;
1148     newFrame->frame32     = oldFrame->frame32;
1149     newFrame->module_cs   = oldFrame->module_cs;
1150     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1151     newFrame->entry_ip    = oldFrame->entry_ip;
1152 }
1153
1154
1155 /***********************************************************************
1156  *           GetTaskQueueDS  (KERNEL.118)
1157  */
1158 void WINAPI GetTaskQueueDS16(void)
1159 {
1160     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1161 }
1162
1163
1164 /***********************************************************************
1165  *           GetTaskQueueES  (KERNEL.119)
1166  */
1167 void WINAPI GetTaskQueueES16(void)
1168 {
1169     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1170 }
1171
1172
1173 /***********************************************************************
1174  *           GetCurrentTask   (KERNEL32.@)
1175  */
1176 HTASK16 WINAPI GetCurrentTask(void)
1177 {
1178     return NtCurrentTeb()->htask16;
1179 }
1180
1181 /***********************************************************************
1182  *           GetCurrentTask   (KERNEL.36)
1183  */
1184 DWORD WINAPI WIN16_GetCurrentTask(void)
1185 {
1186     /* This is the version used by relay code; the first task is */
1187     /* returned in the high word of the result */
1188     return MAKELONG( GetCurrentTask(), hFirstTask );
1189 }
1190
1191
1192 /***********************************************************************
1193  *           GetCurrentPDB   (KERNEL.37)
1194  *
1195  * UNDOC: returns PSP of KERNEL in high word
1196  */
1197 DWORD WINAPI GetCurrentPDB16(void)
1198 {
1199     TDB *pTask;
1200
1201     if (!(pTask = TASK_GetCurrent())) return 0;
1202     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1203 }
1204
1205
1206 /***********************************************************************
1207  *           GetCurPID   (KERNEL.157)
1208  */
1209 DWORD WINAPI GetCurPID16( DWORD unused )
1210 {
1211     return 0;
1212 }
1213
1214
1215 /***********************************************************************
1216  *           GetInstanceData   (KERNEL.54)
1217  */
1218 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1219 {
1220     char *ptr = (char *)GlobalLock16( instance );
1221     if (!ptr || !len) return 0;
1222     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1223     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1224     return len;
1225 }
1226
1227
1228 /***********************************************************************
1229  *           GetExeVersion   (KERNEL.105)
1230  */
1231 WORD WINAPI GetExeVersion16(void)
1232 {
1233     TDB *pTask;
1234
1235     if (!(pTask = TASK_GetCurrent())) return 0;
1236     return pTask->version;
1237 }
1238
1239
1240 /***********************************************************************
1241  *           SetErrorMode   (KERNEL.107)
1242  */
1243 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1244 {
1245     TDB *pTask;
1246     if (!(pTask = TASK_GetCurrent())) return 0;
1247     pTask->error_mode = mode;
1248     return SetErrorMode( mode );
1249 }
1250
1251
1252 /***********************************************************************
1253  *           GetNumTasks   (KERNEL.152)
1254  */
1255 UINT16 WINAPI GetNumTasks16(void)
1256 {
1257     return nTaskCount;
1258 }
1259
1260
1261 /***********************************************************************
1262  *           GetTaskDS   (KERNEL.155)
1263  *
1264  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1265  * I don't think we need to bother with this.
1266  */
1267 HINSTANCE16 WINAPI GetTaskDS16(void)
1268 {
1269     TDB *pTask;
1270
1271     if (!(pTask = TASK_GetCurrent())) return 0;
1272     return GlobalHandleToSel16(pTask->hInstance);
1273 }
1274
1275 /***********************************************************************
1276  *           GetDummyModuleHandleDS   (KERNEL.602)
1277  */
1278 WORD WINAPI GetDummyModuleHandleDS16(void)
1279 {
1280     TDB *pTask;
1281     WORD selector;
1282
1283     if (!(pTask = TASK_GetCurrent())) return 0;
1284     if (!(pTask->flags & TDBF_WIN32)) return 0;
1285     selector = GlobalHandleToSel16( pTask->hModule );
1286     CURRENT_DS = selector;
1287     return selector;
1288 }
1289
1290 /***********************************************************************
1291  *           IsTask   (KERNEL.320)
1292  *           IsTask16 (KERNEL32.@)
1293  */
1294 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1295 {
1296     TDB *pTask;
1297
1298     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1299     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1300     return (pTask->magic == TDB_MAGIC);
1301 }
1302
1303
1304 /***********************************************************************
1305  *           IsWinOldApTask   (KERNEL.158)
1306  */
1307 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1308 {
1309     /* should return bit 0 of byte 0x48 in PSP */
1310     return FALSE;
1311 }
1312
1313 /***********************************************************************
1314  *           SetTaskSignalProc   (KERNEL.38)
1315  */
1316 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1317 {
1318     TDB *pTask;
1319     FARPROC16 oldProc;
1320
1321     if (!hTask) hTask = GetCurrentTask();
1322     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1323     oldProc = pTask->userhandler;
1324     pTask->userhandler = proc;
1325     return oldProc;
1326 }
1327
1328 /***********************************************************************
1329  *           TASK_CallTaskSignalProc
1330  */
1331 /* ### start build ### */
1332 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1333 /* ### stop build ### */
1334 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1335 {
1336     TDB *pTask = TASK_GetCurrent();
1337     if ( !pTask || !pTask->userhandler ) return;
1338
1339     TASK_CallTo16_word_wwwww( pTask->userhandler,
1340                               hTaskOrModule, uCode, 0,
1341                               pTask->hInstance, pTask->hQueue );
1342 }
1343
1344 /***********************************************************************
1345  *           SetSigHandler   (KERNEL.140)
1346  */
1347 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1348                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1349 {
1350     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1351           newhandler,oldhandler,oldmode,newmode,flag );
1352
1353     if (flag != 1) return 0;
1354     if (!newmode) newhandler = NULL;  /* Default handler */
1355     if (newmode != 4)
1356     {
1357         TDB *pTask;
1358
1359         if (!(pTask = TASK_GetCurrent())) return 0;
1360         if (oldmode) *oldmode = pTask->signal_flags;
1361         pTask->signal_flags = newmode;
1362         if (oldhandler) *oldhandler = pTask->sighandler;
1363         pTask->sighandler = newhandler;
1364     }
1365     return 0;
1366 }
1367
1368
1369 /***********************************************************************
1370  *           GlobalNotify   (KERNEL.154)
1371  *
1372  * Note that GlobalNotify does _not_ return the old NotifyProc
1373  * -- contrary to LocalNotify !!
1374  */
1375 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1376 {
1377     TDB *pTask;
1378
1379     if (!(pTask = TASK_GetCurrent())) return;
1380     pTask->discardhandler = proc;
1381 }
1382
1383
1384 /***********************************************************************
1385  *           GetExePtrHelper
1386  */
1387 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1388 {
1389     char *ptr;
1390     HANDLE16 owner;
1391
1392       /* Check for module handle */
1393
1394     if (!(ptr = GlobalLock16( handle ))) return 0;
1395     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1396
1397       /* Search for this handle inside all tasks */
1398
1399     *hTask = hFirstTask;
1400     while (*hTask)
1401     {
1402         TDB *pTask = TASK_GetPtr( *hTask );
1403         if ((*hTask == handle) ||
1404             (pTask->hInstance == handle) ||
1405             (pTask->hQueue == handle) ||
1406             (pTask->hPDB == handle)) return pTask->hModule;
1407         *hTask = pTask->hNext;
1408     }
1409
1410       /* Check the owner for module handle */
1411
1412     owner = FarGetOwner16( handle );
1413     if (!(ptr = GlobalLock16( owner ))) return 0;
1414     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1415
1416       /* Search for the owner inside all tasks */
1417
1418     *hTask = hFirstTask;
1419     while (*hTask)
1420     {
1421         TDB *pTask = TASK_GetPtr( *hTask );
1422         if ((*hTask == owner) ||
1423             (pTask->hInstance == owner) ||
1424             (pTask->hQueue == owner) ||
1425             (pTask->hPDB == owner)) return pTask->hModule;
1426         *hTask = pTask->hNext;
1427     }
1428
1429     return 0;
1430 }
1431
1432 /***********************************************************************
1433  *           GetExePtr   (KERNEL.133)
1434  */
1435 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1436 {
1437     HTASK16 hTask = 0;
1438     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1439     STACK16FRAME *frame = CURRENT_STACK16;
1440     frame->ecx = hModule;
1441     if (hTask) frame->es = hTask;
1442     return hModule;
1443 }
1444
1445
1446 /***********************************************************************
1447  *           K228   (KERNEL.228)
1448  */
1449 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1450 {
1451     HTASK16 hTask = 0;
1452     return GetExePtrHelper( handle, &hTask );
1453 }
1454
1455
1456 /***********************************************************************
1457  *           TaskFirst   (TOOLHELP.63)
1458  */
1459 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1460 {
1461     lpte->hNext = hFirstTask;
1462     return TaskNext16( lpte );
1463 }
1464
1465
1466 /***********************************************************************
1467  *           TaskNext   (TOOLHELP.64)
1468  */
1469 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1470 {
1471     TDB *pTask;
1472     INSTANCEDATA *pInstData;
1473
1474     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1475     if (!lpte->hNext) return FALSE;
1476
1477     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1478     while (1) {
1479         pTask = TASK_GetPtr( lpte->hNext );
1480         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1481         if (pTask->hInstance)
1482             break;
1483         lpte->hNext = pTask->hNext;
1484     }
1485     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1486     lpte->hTask         = lpte->hNext;
1487     lpte->hTaskParent   = pTask->hParent;
1488     lpte->hInst         = pTask->hInstance;
1489     lpte->hModule       = pTask->hModule;
1490     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1491     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1492     lpte->wStackTop     = pInstData->stacktop;
1493     lpte->wStackMinimum = pInstData->stackmin;
1494     lpte->wStackBottom  = pInstData->stackbottom;
1495     lpte->wcEvents      = pTask->nEvents;
1496     lpte->hQueue        = pTask->hQueue;
1497     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1498     lpte->wPSPOffset    = 0x100;  /*??*/
1499     lpte->hNext         = pTask->hNext;
1500     return TRUE;
1501 }
1502
1503
1504 /***********************************************************************
1505  *           TaskFindHandle   (TOOLHELP.65)
1506  */
1507 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1508 {
1509     lpte->hNext = hTask;
1510     return TaskNext16( lpte );
1511 }
1512
1513
1514 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1515
1516 /**************************************************************************
1517  *           FatalAppExit   (KERNEL.137)
1518  */
1519 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1520 {
1521     TDB *pTask = TASK_GetCurrent();
1522
1523     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1524     {
1525         HMODULE mod = GetModuleHandleA( "user32.dll" );
1526         if (mod)
1527         {
1528             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1529             if (pMessageBoxA)
1530             {
1531                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1532                 goto done;
1533             }
1534         }
1535         ERR( "%s\n", debugstr_a(str) );
1536     }
1537  done:
1538     ExitThread(0xff);
1539 }
1540
1541
1542 /***********************************************************************
1543  *           TerminateApp   (TOOLHELP.77)
1544  *
1545  * See "Undocumented Windows".
1546  */
1547 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1548 {
1549     if (hTask && hTask != GetCurrentTask())
1550     {
1551         FIXME("cannot terminate task %x\n", hTask);
1552         return;
1553     }
1554
1555     if (wFlags & NO_UAE_BOX)
1556     {
1557         UINT16 old_mode;
1558         old_mode = SetErrorMode16(0);
1559         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1560     }
1561     FatalAppExit16( 0, NULL );
1562
1563     /* hmm, we're still alive ?? */
1564
1565     /* check undocumented flag */
1566     if (!(wFlags & 0x8000))
1567         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1568
1569     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1570        but let's just call ExitThread */
1571     ExitThread(0xff);
1572 }
1573
1574
1575 /***********************************************************************
1576  *           GetAppCompatFlags   (KERNEL.354)
1577  */
1578 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1579 {
1580     TDB *pTask;
1581
1582     if (!hTask) hTask = GetCurrentTask();
1583     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1584     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1585     return pTask->compat_flags;
1586 }