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
 262       /* Allocate the task structure */
 263
 264     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 265     if (!hTask) return NULL;
 266     pTask = TASK_GetPtr( hTask );
 267     FarSetOwner16( hTask, pModule->self );
 268
 269     /* Fill the task structure */
 270
 271     pTask->hSelf = hTask;
 272
 273     if (teb && teb->tibflags & TEBF_WIN32)
 274     {
 275         pTask->flags        |= TDBF_WIN32;
 276         pTask->hInstance     = pModule->self;
 277         pTask->hPrevInstance = 0;
 278         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 279            in NE_InitProcess */
 280     }
 281
 282     pTask->version       = pModule->expected_version;
 283     pTask->hModule       = pModule->self;
 284     pTask->hParent       = GetCurrentTask();
 285     pTask->magic         = TDB_MAGIC;
 286     pTask->nCmdShow      = cmdShow;
 287     pTask->teb           = teb;
 288     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 289     strcpy( pTask->curdir, "\\" );
 290     lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 291                  sizeof(pTask->curdir) - 1 );
 292
 293       /* Create the thunks block */
 294
 295     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 296
 297       /* Copy the module name */
 298
 299     GetModuleName16( pModule->self, name, sizeof(name) );
 300     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 301
 302       /* Allocate a selector for the PDB */
 303
 304     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 305                                       pModule->self, WINE_LDT_FLAGS_DATA );
 306
 307       /* Fill the PDB */
 308
 309     pTask->pdb.int20 = 0x20cd;
 310     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 311     PUT_UA_DWORD(&pTask->pdb.dispatcher[1],
 312                  (DWORD)GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" ));
 313     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 314     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 315     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 316     pTask->pdb.fileHandlesPtr =
 317         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 318     pTask->pdb.hFileHandles = 0;
 319     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 320     /* FIXME: should we make a copy of the environment? */
 321     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 322     pTask->pdb.nbFiles        = 20;
 323
 324     /* Fill the command line */
 325
 326     if (!cmdline)
 327     {
 328         cmdline = GetCommandLineA();
 329         /* remove the first word (program name) */
 330         if (*cmdline == '"')
 331             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 332         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 333         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 334         len = strlen(cmdline);
 335     }
 336     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 337     pTask->pdb.cmdLine[0] = len;
 338     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 339     /* pTask->pdb.cmdLine[len+1] = 0; */
 340
 341     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 342
 343       /* Get the compatibility flags */
 344
 345     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 346
 347       /* Allocate a code segment alias for the TDB */
 348
 349     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 350                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 351
 352       /* Default DTA overwrites command line */
 353
 354     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 355
 356     /* Create scheduler event for 16-bit tasks */
 357
 358     if ( !(pTask->flags & TDBF_WIN32) )
 359         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 360
 361     /* Enter task handle into thread */
 362
 363     if (teb) teb->htask16 = hTask;
 364     if (!initial_task) initial_task = hTask;
 365
 366     return pTask;
 367 }
 368
 369
 370 /***********************************************************************
 371  *           TASK_DeleteTask
 372  */
 373 static void TASK_DeleteTask( HTASK16 hTask )
 374 {
 375     TDB *pTask;
 376     HGLOBAL16 hPDB;
 377
 378     if (!(pTask = TASK_GetPtr( hTask ))) return;
 379     hPDB = pTask->hPDB;
 380
 381     pTask->magic = 0xdead; /* invalidate signature */
 382
 383     /* Free the selector aliases */
 384
 385     GLOBAL_FreeBlock( pTask->hCSAlias );
 386     GLOBAL_FreeBlock( pTask->hPDB );
 387
 388     /* Free the task module */
 389
 390     FreeModule16( pTask->hModule );
 391
 392     /* Free the task structure itself */
 393
 394     GlobalFree16( hTask );
 395
 396     /* Free all memory used by this task (including the 32-bit stack, */
 397     /* the environment block and the thunk segments). */
 398
 399     GlobalFreeAll16( hPDB );
 400 }
 401
 402
 403 /***********************************************************************
 404  *           TASK_CreateMainTask
 405  *
 406  * Create a task for the main (32-bit) process.
 407  */
 408 void TASK_CreateMainTask(void)
 409 {
 410     TDB *pTask;
 411     STARTUPINFOA startup_info;
 412     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 413
 414     GetStartupInfoA( &startup_info );
 415     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 416     pTask = TASK_Create( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
 417                          cmdShow, NtCurrentTeb(), NULL, 0 );
 418     if (!pTask)
 419     {
 420         ERR("could not create task for main process\n");
 421         ExitProcess(1);
 422     }
 423
 424     /* Add the task to the linked list */
 425     /* (no need to get the win16 lock, we are the only thread at this point) */
 426     TASK_LinkTask( pTask->hSelf );
 427 }
 428
 429
 430 /* startup routine for a new 16-bit thread */
 431 static DWORD CALLBACK task_start( TDB *pTask )
 432 {
 433     DWORD ret;
 434
 435     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 436     NtCurrentTeb()->htask16 = pTask->hSelf;
 437
 438     _EnterWin16Lock();
 439     TASK_LinkTask( pTask->hSelf );
 440     pTask->teb = NtCurrentTeb();
 441     ret = NE_StartTask();
 442     _LeaveWin16Lock();
 443     return ret;
 444 }
 445
 446
 447 /***********************************************************************
 448  *           TASK_SpawnTask
 449  *
 450  * Spawn a new 16-bit task.
 451  */
 452 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 453                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 454 {
 455     TDB *pTask;
 456
 457     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 458     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 459     {
 460         TASK_DeleteTask( pTask->hSelf );
 461         return 0;
 462     }
 463     return pTask->hSelf;
 464 }
 465
 466
 467 /***********************************************************************
 468  *           TASK_ExitTask
 469  */
 470 void TASK_ExitTask(void)
 471 {
 472     TDB *pTask;
 473     DWORD lockCount;
 474
 475     /* Enter the Win16Lock to protect global data structures */
 476     _EnterWin16Lock();
 477
 478     pTask = TASK_GetCurrent();
 479     if ( !pTask )
 480     {
 481         _LeaveWin16Lock();
 482         return;
 483     }
 484
 485     TRACE("Killing task %04x\n", pTask->hSelf );
 486
 487     /* Perform USER cleanup */
 488
 489     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 490     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 491     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 492     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 493
 494     /* Remove the task from the list to be sure we never switch back to it */
 495     TASK_UnlinkTask( pTask->hSelf );
 496
 497     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 498     {
 499         TRACE("this is the last task, exiting\n" );
 500         ExitKernel16();
 501     }
 502
 503     if( nTaskCount )
 504     {
 505         TDB* p = TASK_GetPtr( hFirstTask );
 506         while( p )
 507         {
 508             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 509             p = TASK_GetPtr( p->hNext );
 510         }
 511     }
 512
 513     pTask->nEvents = 0;
 514
 515     if ( hLockedTask == pTask->hSelf )
 516         hLockedTask = 0;
 517
 518     TASK_DeleteTask( pTask->hSelf );
 519
 520     /* ... and completely release the Win16Lock, just in case. */
 521     ReleaseThunkLock( &lockCount );
 522 }
 523
 524
 525 /***********************************************************************
 526  *           InitTask  (KERNEL.91)
 527  *
 528  * Called by the application startup code.
 529  */
 530 void WINAPI InitTask16( CONTEXT86 *context )
 531 {
 532     TDB *pTask;
 533     INSTANCEDATA *pinstance;
 534     SEGPTR ptr;
 535
 536     context->Eax = 0;
 537     if (!(pTask = TASK_GetCurrent())) return;
 538
 539     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 540        as some apps, notably Visual Basic apps, *modify* the heap/stack
 541        size of the instance data segment before calling InitTask() */
 542
 543     /* Initialize the INSTANCEDATA structure */
 544     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 545     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 546     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 547     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 548                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 549
 550     /* Initialize the local heap */
 551     if (LOWORD(context->Ecx))
 552         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 553
 554     /* Initialize implicitly loaded DLLs */
 555     NE_InitializeDLLs( pTask->hModule );
 556     NE_DllProcessAttach( pTask->hModule );
 557
 558     /* Registers on return are:
 559      * ax     1 if OK, 0 on error
 560      * cx     stack limit in bytes
 561      * dx     cmdShow parameter
 562      * si     instance handle of the previous instance
 563      * di     instance handle of the new task
 564      * es:bx  pointer to command line inside PSP
 565      *
 566      * 0 (=%bp) is pushed on the stack
 567      */
 568     ptr = stack16_push( sizeof(WORD) );
 569     *(WORD *)MapSL(ptr) = 0;
 570     context->Esp -= 2;
 571
 572     context->Eax = 1;
 573
 574     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 575     else
 576     {
 577         LPBYTE p = &pTask->pdb.cmdLine[1];
 578         while ((*p == ' ') || (*p == '\t')) p++;
 579         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 580     }
 581     context->Ecx   = pinstance->stacktop;
 582     context->Edx   = pTask->nCmdShow;
 583     context->Esi   = (DWORD)pTask->hPrevInstance;
 584     context->Edi   = (DWORD)pTask->hInstance;
 585     context->SegEs = (WORD)pTask->hPDB;
 586 }
 587
 588
 589 /***********************************************************************
 590  *           WaitEvent  (KERNEL.30)
 591  */
 592 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 593 {
 594     TDB *pTask;
 595
 596     if (!hTask) hTask = GetCurrentTask();
 597     pTask = TASK_GetPtr( hTask );
 598
 599     if (pTask->flags & TDBF_WIN32)
 600     {
 601         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 602         return TRUE;
 603     }
 604
 605     if (pTask->nEvents > 0)
 606     {
 607         pTask->nEvents--;
 608         return FALSE;
 609     }
 610
 611     if (pTask->teb == NtCurrentTeb())
 612     {
 613         DWORD lockCount;
 614
 615         NtResetEvent( pTask->hEvent, NULL );
 616         ReleaseThunkLock( &lockCount );
 617         SYSLEVEL_CheckNotLevel( 1 );
 618         WaitForSingleObject( pTask->hEvent, INFINITE );
 619         RestoreThunkLock( lockCount );
 620         if (pTask->nEvents > 0) pTask->nEvents--;
 621     }
 622     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 623
 624     return TRUE;
 625 }
 626
 627
 628 /***********************************************************************
 629  *           PostEvent  (KERNEL.31)
 630  */
 631 void WINAPI PostEvent16( HTASK16 hTask )
 632 {
 633     TDB *pTask;
 634
 635     if (!hTask) hTask = GetCurrentTask();
 636     if (!(pTask = TASK_GetPtr( hTask ))) return;
 637
 638     if (pTask->flags & TDBF_WIN32)
 639     {
 640         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 641         return;
 642     }
 643
 644     pTask->nEvents++;
 645
 646     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 647 }
 648
 649
 650 /***********************************************************************
 651  *           SetPriority  (KERNEL.32)
 652  */
 653 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 654 {
 655     TDB *pTask;
 656     INT16 newpriority;
 657
 658     if (!hTask) hTask = GetCurrentTask();
 659     if (!(pTask = TASK_GetPtr( hTask ))) return;
 660     newpriority = pTask->priority + delta;
 661     if (newpriority < -32) newpriority = -32;
 662     else if (newpriority > 15) newpriority = 15;
 663
 664     pTask->priority = newpriority + 1;
 665     TASK_UnlinkTask( pTask->hSelf );
 666     TASK_LinkTask( pTask->hSelf );
 667     pTask->priority--;
 668 }
 669
 670
 671 /***********************************************************************
 672  *           LockCurrentTask  (KERNEL.33)
 673  */
 674 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 675 {
 676     if (bLock) hLockedTask = GetCurrentTask();
 677     else hLockedTask = 0;
 678     return hLockedTask;
 679 }
 680
 681
 682 /***********************************************************************
 683  *           IsTaskLocked  (KERNEL.122)
 684  */
 685 HTASK16 WINAPI IsTaskLocked16(void)
 686 {
 687     return hLockedTask;
 688 }
 689
 690
 691 /***********************************************************************
 692  *           OldYield  (KERNEL.117)
 693  */
 694 void WINAPI OldYield16(void)
 695 {
 696    DWORD count;
 697
 698    ReleaseThunkLock(&count);
 699    RestoreThunkLock(count);
 700 }
 701
 702 /***********************************************************************
 703  *           WIN32_OldYield  (KERNEL.447)
 704  */
 705 void WINAPI WIN32_OldYield16(void)
 706 {
 707    DWORD count;
 708
 709    ReleaseThunkLock(&count);
 710    RestoreThunkLock(count);
 711 }
 712
 713 /***********************************************************************
 714  *           DirectedYield  (KERNEL.150)
 715  */
 716 void WINAPI DirectedYield16( HTASK16 hTask )
 717 {
 718     TDB *pCurTask = TASK_GetCurrent();
 719
 720     if (pCurTask->flags & TDBF_WIN32)
 721     {
 722         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 723         return;
 724     }
 725
 726     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 727
 728     pCurTask->hYieldTo = hTask;
 729     OldYield16();
 730
 731     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 732 }
 733
 734 /***********************************************************************
 735  *           Yield  (KERNEL.29)
 736  */
 737 void WINAPI Yield16(void)
 738 {
 739     TDB *pCurTask = TASK_GetCurrent();
 740
 741     if (pCurTask) pCurTask->hYieldTo = 0;
 742     if (pCurTask && pCurTask->hQueue)
 743     {
 744         HMODULE mod = GetModuleHandleA( "user32.dll" );
 745         if (mod)
 746         {
 747             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 748             if (proc)
 749             {
 750                 proc();
 751                 return;
 752             }
 753         }
 754     }
 755     OldYield16();
 756 }
 757
 758 /***********************************************************************
 759  *           KERNEL_490  (KERNEL.490)
 760  */
 761 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 762 {
 763     if ( !someTask ) return 0;
 764
 765     FIXME("(%04x): stub\n", someTask );
 766     return 0;
 767 }
 768
 769 /***********************************************************************
 770  *           MakeProcInstance  (KERNEL.51)
 771  */
 772 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 773 {
 774     BYTE *thunk,*lfunc;
 775     SEGPTR thunkaddr;
 776     WORD hInstanceSelector;
 777
 778     hInstanceSelector = GlobalHandleToSel16(hInstance);
 779
 780     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 781
 782     if (!HIWORD(func)) {
 783       /* Win95 actually protects via SEH, but this is better for debugging */
 784       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 785       return (FARPROC16)0;
 786     }
 787
 788     if (hInstance)
 789     {
 790         if ( (!(hInstance & 4)) ||
 791              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 792         {
 793             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 794                 hInstance);
 795             return 0;
 796         }
 797     }
 798
 799     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 800       && (hInstance != 0)
 801       && (hInstance != 0xffff) )
 802     {
 803         /* calling MPI with a foreign DSEG is invalid ! */
 804         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 805                    hInstance,CURRENT_DS);
 806     }
 807
 808     /* Always use the DSEG that MPI was entered with.
 809      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 810      * as CURRENT_DS provides the DSEG value we need.
 811      * ("calling" DS, *not* "task" DS !) */
 812     hInstanceSelector = CURRENT_DS;
 813     hInstance = GlobalHandle16(hInstanceSelector);
 814
 815     /* no thunking for DLLs */
 816     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 817         return func;
 818
 819     thunkaddr = TASK_AllocThunk();
 820     if (!thunkaddr) return (FARPROC16)0;
 821     thunk = MapSL( thunkaddr );
 822     lfunc = MapSL( (SEGPTR)func );
 823
 824     TRACE("(%08lx,%04x): got thunk %08lx\n",
 825           (DWORD)func, hInstance, (DWORD)thunkaddr );
 826     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 827         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 828     ) {
 829         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 830     }
 831
 832     *thunk++ = 0xb8;    /* movw instance, %ax */
 833     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 834     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 835     *thunk++ = 0xea;    /* ljmp func */
 836     *(DWORD *)thunk = (DWORD)func;
 837     return (FARPROC16)thunkaddr;
 838     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 839 }
 840
 841
 842 /***********************************************************************
 843  *           FreeProcInstance  (KERNEL.52)
 844  */
 845 void WINAPI FreeProcInstance16( FARPROC16 func )
 846 {
 847     TRACE("(%08lx)\n", (DWORD)func );
 848     TASK_FreeThunk( (SEGPTR)func );
 849 }
 850
 851 /**********************************************************************
 852  *          TASK_GetCodeSegment
 853  *
 854  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 855  * and logical segment number of a given code segment.
 856  *
 857  * 'proc' either *is* already a pair of module handle and segment number,
 858  * in which case there's nothing to do.  Otherwise, it is a pointer to
 859  * a function, and we need to retrieve the code segment.  If the pointer
 860  * happens to point to a thunk, we'll retrieve info about the code segment
 861  * where the function pointed to by the thunk resides, not the thunk itself.
 862  *
 863  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 864  *        the function the snoop code will return to ...
 865  *
 866  */
 867 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 868                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 869 {
 870     NE_MODULE *pModule = NULL;
 871     SEGTABLEENTRY *pSeg = NULL;
 872     int segNr=0;
 873
 874     /* Try pair of module handle / segment number */
 875     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 876     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 877     {
 878         segNr = LOWORD( proc );
 879         if ( segNr && segNr <= pModule->seg_count )
 880             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 881     }
 882
 883     /* Try thunk or function */
 884     else
 885     {
 886         BYTE *thunk = MapSL( (SEGPTR)proc );
 887         WORD selector;
 888
 889         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 890             selector = thunk[6] + (thunk[7] << 8);
 891         else
 892             selector = HIWORD( proc );
 893
 894         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 895         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 896
 897         if ( pModule )
 898             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 899                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 900                     break;
 901
 902         if ( pModule && segNr > pModule->seg_count )
 903             pSeg = NULL;
 904     }
 905
 906     /* Abort if segment not found */
 907
 908     if ( !pModule || !pSeg )
 909         return FALSE;
 910
 911     /* Return segment data */
 912
 913     if ( ppModule ) *ppModule = pModule;
 914     if ( ppSeg    ) *ppSeg    = pSeg;
 915     if ( pSegNr   ) *pSegNr   = segNr;
 916
 917     return TRUE;
 918 }
 919
 920 /**********************************************************************
 921  *          GetCodeHandle    (KERNEL.93)
 922  */
 923 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 924 {
 925     SEGTABLEENTRY *pSeg;
 926
 927     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 928         return (HANDLE16)0;
 929
 930     return pSeg->hSeg;
 931 }
 932
 933 /**********************************************************************
 934  *          GetCodeInfo    (KERNEL.104)
 935  */
 936 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 937 {
 938     NE_MODULE *pModule;
 939     SEGTABLEENTRY *pSeg;
 940     int segNr;
 941
 942     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 943         return FALSE;
 944
 945     /* Fill in segment information */
 946
 947     segInfo->offSegment = pSeg->filepos;
 948     segInfo->cbSegment  = pSeg->size;
 949     segInfo->flags      = pSeg->flags;
 950     segInfo->cbAlloc    = pSeg->minsize;
 951     segInfo->h          = pSeg->hSeg;
 952     segInfo->alignShift = pModule->alignment;
 953
 954     if ( segNr == pModule->dgroup )
 955         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 956
 957     /* Return module handle in %es */
 958
 959     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 960
 961     return TRUE;
 962 }
 963
 964
 965 /**********************************************************************
 966  *          DefineHandleTable    (KERNEL.94)
 967  */
 968 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 969 {
 970     FIXME("(%04x): stub ?\n", wOffset);
 971     return TRUE;
 972 }
 973
 974
 975 /***********************************************************************
 976  *           SetTaskQueue  (KERNEL.34)
 977  */
 978 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 979 {
 980     HQUEUE16 hPrev;
 981     TDB *pTask;
 982
 983     if (!hTask) hTask = GetCurrentTask();
 984     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 985
 986     hPrev = pTask->hQueue;
 987     pTask->hQueue = hQueue;
 988
 989     return hPrev;
 990 }
 991
 992
 993 /***********************************************************************
 994  *           GetTaskQueue  (KERNEL.35)
 995  */
 996 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
 997 {
 998     TDB *pTask;
 999
1000     if (!hTask) hTask = GetCurrentTask();
1001     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1002     return pTask->hQueue;
1003 }
1004
1005 /***********************************************************************
1006  *           SetThreadQueue  (KERNEL.463)
1007  */
1008 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1009 {
1010     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1011     HQUEUE16 oldQueue = teb? teb->queue : 0;
1012
1013     if ( teb )
1014     {
1015         teb->queue = hQueue;
1016
1017         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1018             SetTaskQueue16( teb->htask16, hQueue );
1019     }
1020
1021     return oldQueue;
1022 }
1023
1024 /***********************************************************************
1025  *           GetThreadQueue  (KERNEL.464)
1026  */
1027 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1028 {
1029     TEB *teb = NULL;
1030     if ( !thread )
1031         teb = NtCurrentTeb();
1032     else if ( HIWORD(thread) )
1033         teb = THREAD_IdToTEB( thread );
1034     else if ( IsTask16( (HTASK16)thread ) )
1035         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1036
1037     return (HQUEUE16)(teb? teb->queue : 0);
1038 }
1039
1040 /***********************************************************************
1041  *           SetFastQueue  (KERNEL.624)
1042  */
1043 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1044 {
1045     TEB *teb = NULL;
1046     if ( !thread )
1047         teb = NtCurrentTeb();
1048     else if ( HIWORD(thread) )
1049         teb = THREAD_IdToTEB( thread );
1050     else if ( IsTask16( (HTASK16)thread ) )
1051         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1052
1053     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1054 }
1055
1056 /***********************************************************************
1057  *           GetFastQueue  (KERNEL.625)
1058  */
1059 HANDLE WINAPI GetFastQueue16( void )
1060 {
1061     HANDLE ret = (HANDLE)NtCurrentTeb()->queue;
1062
1063     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1064     return ret;
1065 }
1066
1067 /***********************************************************************
1068  *           SwitchStackTo   (KERNEL.108)
1069  */
1070 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1071 {
1072     TDB *pTask;
1073     STACK16FRAME *oldFrame, *newFrame;
1074     INSTANCEDATA *pData;
1075     UINT16 copySize;
1076
1077     if (!(pTask = TASK_GetCurrent())) return;
1078     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1079     TRACE("old=%04x:%04x new=%04x:%04x\n",
1080           SELECTOROF( pTask->teb->cur_stack ),
1081           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1082
1083     /* Save the old stack */
1084
1085     oldFrame = THREAD_STACK16( pTask->teb );
1086     /* pop frame + args and push bp */
1087     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1088                            + 2 * sizeof(WORD);
1089     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1090     pData->stacktop    = top;
1091     pData->stackmin    = ptr;
1092     pData->stackbottom = ptr;
1093
1094     /* Switch to the new stack */
1095
1096     /* Note: we need to take the 3 arguments into account; otherwise,
1097      * the stack will underflow upon return from this function.
1098      */
1099     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1100     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1101     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1102     newFrame = THREAD_STACK16( pTask->teb );
1103
1104     /* Copy the stack frame and the local variables to the new stack */
1105
1106     memmove( newFrame, oldFrame, copySize );
1107     newFrame->bp = ptr;
1108     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1109 }
1110
1111
1112 /***********************************************************************
1113  *           SwitchStackBack   (KERNEL.109)
1114  */
1115 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1116 {
1117     STACK16FRAME *oldFrame, *newFrame;
1118     INSTANCEDATA *pData;
1119
1120     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1121         return;
1122     if (!pData->old_ss_sp)
1123     {
1124         WARN("No previous SwitchStackTo\n" );
1125         return;
1126     }
1127     TRACE("restoring stack %04x:%04x\n",
1128           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1129
1130     oldFrame = CURRENT_STACK16;
1131
1132     /* Pop bp from the previous stack */
1133
1134     BP_reg(context) = *(WORD *)MapSL(pData->old_ss_sp);
1135     pData->old_ss_sp += sizeof(WORD);
1136
1137     /* Switch back to the old stack */
1138
1139     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1140     context->SegSs = SELECTOROF(pData->old_ss_sp);
1141     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1142     pData->old_ss_sp = 0;
1143
1144     /* Build a stack frame for the return */
1145
1146     newFrame = CURRENT_STACK16;
1147     newFrame->frame32     = oldFrame->frame32;
1148     newFrame->module_cs   = oldFrame->module_cs;
1149     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1150     newFrame->entry_ip    = oldFrame->entry_ip;
1151 }
1152
1153
1154 /***********************************************************************
1155  *           GetTaskQueueDS  (KERNEL.118)
1156  */
1157 void WINAPI GetTaskQueueDS16(void)
1158 {
1159     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1160 }
1161
1162
1163 /***********************************************************************
1164  *           GetTaskQueueES  (KERNEL.119)
1165  */
1166 void WINAPI GetTaskQueueES16(void)
1167 {
1168     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1169 }
1170
1171
1172 /***********************************************************************
1173  *           GetCurrentTask   (KERNEL32.@)
1174  */
1175 HTASK16 WINAPI GetCurrentTask(void)
1176 {
1177     return NtCurrentTeb()->htask16;
1178 }
1179
1180 /***********************************************************************
1181  *           GetCurrentTask   (KERNEL.36)
1182  */
1183 DWORD WINAPI WIN16_GetCurrentTask(void)
1184 {
1185     /* This is the version used by relay code; the first task is */
1186     /* returned in the high word of the result */
1187     return MAKELONG( GetCurrentTask(), hFirstTask );
1188 }
1189
1190
1191 /***********************************************************************
1192  *           GetCurrentPDB   (KERNEL.37)
1193  *
1194  * UNDOC: returns PSP of KERNEL in high word
1195  */
1196 DWORD WINAPI GetCurrentPDB16(void)
1197 {
1198     TDB *pTask;
1199
1200     if (!(pTask = TASK_GetCurrent())) return 0;
1201     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1202 }
1203
1204
1205 /***********************************************************************
1206  *           GetCurPID   (KERNEL.157)
1207  */
1208 DWORD WINAPI GetCurPID16( DWORD unused )
1209 {
1210     return 0;
1211 }
1212
1213
1214 /***********************************************************************
1215  *           GetInstanceData   (KERNEL.54)
1216  */
1217 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1218 {
1219     char *ptr = (char *)GlobalLock16( instance );
1220     if (!ptr || !len) return 0;
1221     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1222     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1223     return len;
1224 }
1225
1226
1227 /***********************************************************************
1228  *           GetExeVersion   (KERNEL.105)
1229  */
1230 WORD WINAPI GetExeVersion16(void)
1231 {
1232     TDB *pTask;
1233
1234     if (!(pTask = TASK_GetCurrent())) return 0;
1235     return pTask->version;
1236 }
1237
1238
1239 /***********************************************************************
1240  *           SetErrorMode   (KERNEL.107)
1241  */
1242 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1243 {
1244     TDB *pTask;
1245     if (!(pTask = TASK_GetCurrent())) return 0;
1246     pTask->error_mode = mode;
1247     return SetErrorMode( mode );
1248 }
1249
1250
1251 /***********************************************************************
1252  *           GetNumTasks   (KERNEL.152)
1253  */
1254 UINT16 WINAPI GetNumTasks16(void)
1255 {
1256     return nTaskCount;
1257 }
1258
1259
1260 /***********************************************************************
1261  *           GetTaskDS   (KERNEL.155)
1262  *
1263  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1264  * I don't think we need to bother with this.
1265  */
1266 HINSTANCE16 WINAPI GetTaskDS16(void)
1267 {
1268     TDB *pTask;
1269
1270     if (!(pTask = TASK_GetCurrent())) return 0;
1271     return GlobalHandleToSel16(pTask->hInstance);
1272 }
1273
1274 /***********************************************************************
1275  *           GetDummyModuleHandleDS   (KERNEL.602)
1276  */
1277 WORD WINAPI GetDummyModuleHandleDS16(void)
1278 {
1279     TDB *pTask;
1280     WORD selector;
1281
1282     if (!(pTask = TASK_GetCurrent())) return 0;
1283     if (!(pTask->flags & TDBF_WIN32)) return 0;
1284     selector = GlobalHandleToSel16( pTask->hModule );
1285     CURRENT_DS = selector;
1286     return selector;
1287 }
1288
1289 /***********************************************************************
1290  *           IsTask   (KERNEL.320)
1291  *           IsTask16 (KERNEL32.@)
1292  */
1293 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1294 {
1295     TDB *pTask;
1296
1297     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1298     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1299     return (pTask->magic == TDB_MAGIC);
1300 }
1301
1302
1303 /***********************************************************************
1304  *           IsWinOldApTask   (KERNEL.158)
1305  */
1306 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1307 {
1308     /* should return bit 0 of byte 0x48 in PSP */
1309     return FALSE;
1310 }
1311
1312 /***********************************************************************
1313  *           SetTaskSignalProc   (KERNEL.38)
1314  */
1315 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1316 {
1317     TDB *pTask;
1318     FARPROC16 oldProc;
1319
1320     if (!hTask) hTask = GetCurrentTask();
1321     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1322     oldProc = pTask->userhandler;
1323     pTask->userhandler = proc;
1324     return oldProc;
1325 }
1326
1327 /***********************************************************************
1328  *           TASK_CallTaskSignalProc
1329  */
1330 /* ### start build ### */
1331 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1332 /* ### stop build ### */
1333 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1334 {
1335     TDB *pTask = TASK_GetCurrent();
1336     if ( !pTask || !pTask->userhandler ) return;
1337
1338     TASK_CallTo16_word_wwwww( pTask->userhandler,
1339                               hTaskOrModule, uCode, 0,
1340                               pTask->hInstance, pTask->hQueue );
1341 }
1342
1343 /***********************************************************************
1344  *           SetSigHandler   (KERNEL.140)
1345  */
1346 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1347                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1348 {
1349     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1350           newhandler,oldhandler,oldmode,newmode,flag );
1351
1352     if (flag != 1) return 0;
1353     if (!newmode) newhandler = NULL;  /* Default handler */
1354     if (newmode != 4)
1355     {
1356         TDB *pTask;
1357
1358         if (!(pTask = TASK_GetCurrent())) return 0;
1359         if (oldmode) *oldmode = pTask->signal_flags;
1360         pTask->signal_flags = newmode;
1361         if (oldhandler) *oldhandler = pTask->sighandler;
1362         pTask->sighandler = newhandler;
1363     }
1364     return 0;
1365 }
1366
1367
1368 /***********************************************************************
1369  *           GlobalNotify   (KERNEL.154)
1370  *
1371  * Note that GlobalNotify does _not_ return the old NotifyProc
1372  * -- contrary to LocalNotify !!
1373  */
1374 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1375 {
1376     TDB *pTask;
1377
1378     if (!(pTask = TASK_GetCurrent())) return;
1379     pTask->discardhandler = proc;
1380 }
1381
1382
1383 /***********************************************************************
1384  *           GetExePtrHelper
1385  */
1386 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1387 {
1388     char *ptr;
1389     HANDLE16 owner;
1390
1391       /* Check for module handle */
1392
1393     if (!(ptr = GlobalLock16( handle ))) return 0;
1394     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1395
1396       /* Search for this handle inside all tasks */
1397
1398     *hTask = hFirstTask;
1399     while (*hTask)
1400     {
1401         TDB *pTask = TASK_GetPtr( *hTask );
1402         if ((*hTask == handle) ||
1403             (pTask->hInstance == handle) ||
1404             (pTask->hQueue == handle) ||
1405             (pTask->hPDB == handle)) return pTask->hModule;
1406         *hTask = pTask->hNext;
1407     }
1408
1409       /* Check the owner for module handle */
1410
1411     owner = FarGetOwner16( handle );
1412     if (!(ptr = GlobalLock16( owner ))) return 0;
1413     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1414
1415       /* Search for the owner inside all tasks */
1416
1417     *hTask = hFirstTask;
1418     while (*hTask)
1419     {
1420         TDB *pTask = TASK_GetPtr( *hTask );
1421         if ((*hTask == owner) ||
1422             (pTask->hInstance == owner) ||
1423             (pTask->hQueue == owner) ||
1424             (pTask->hPDB == owner)) return pTask->hModule;
1425         *hTask = pTask->hNext;
1426     }
1427
1428     return 0;
1429 }
1430
1431 /***********************************************************************
1432  *           GetExePtr   (KERNEL.133)
1433  */
1434 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1435 {
1436     HTASK16 hTask = 0;
1437     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1438     STACK16FRAME *frame = CURRENT_STACK16;
1439     frame->ecx = hModule;
1440     if (hTask) frame->es = hTask;
1441     return hModule;
1442 }
1443
1444
1445 /***********************************************************************
1446  *           K228   (KERNEL.228)
1447  */
1448 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1449 {
1450     HTASK16 hTask = 0;
1451     return GetExePtrHelper( handle, &hTask );
1452 }
1453
1454
1455 /***********************************************************************
1456  *           TaskFirst   (TOOLHELP.63)
1457  */
1458 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1459 {
1460     lpte->hNext = hFirstTask;
1461     return TaskNext16( lpte );
1462 }
1463
1464
1465 /***********************************************************************
1466  *           TaskNext   (TOOLHELP.64)
1467  */
1468 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1469 {
1470     TDB *pTask;
1471     INSTANCEDATA *pInstData;
1472
1473     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1474     if (!lpte->hNext) return FALSE;
1475
1476     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1477     while (1) {
1478         pTask = TASK_GetPtr( lpte->hNext );
1479         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1480         if (pTask->hInstance)
1481             break;
1482         lpte->hNext = pTask->hNext;
1483     }
1484     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1485     lpte->hTask         = lpte->hNext;
1486     lpte->hTaskParent   = pTask->hParent;
1487     lpte->hInst         = pTask->hInstance;
1488     lpte->hModule       = pTask->hModule;
1489     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1490     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1491     lpte->wStackTop     = pInstData->stacktop;
1492     lpte->wStackMinimum = pInstData->stackmin;
1493     lpte->wStackBottom  = pInstData->stackbottom;
1494     lpte->wcEvents      = pTask->nEvents;
1495     lpte->hQueue        = pTask->hQueue;
1496     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1497     lpte->wPSPOffset    = 0x100;  /*??*/
1498     lpte->hNext         = pTask->hNext;
1499     return TRUE;
1500 }
1501
1502
1503 /***********************************************************************
1504  *           TaskFindHandle   (TOOLHELP.65)
1505  */
1506 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1507 {
1508     lpte->hNext = hTask;
1509     return TaskNext16( lpte );
1510 }
1511
1512
1513 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1514
1515 /**************************************************************************
1516  *           FatalAppExit   (KERNEL.137)
1517  */
1518 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1519 {
1520     TDB *pTask = TASK_GetCurrent();
1521
1522     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1523     {
1524         HMODULE mod = GetModuleHandleA( "user32.dll" );
1525         if (mod)
1526         {
1527             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1528             if (pMessageBoxA)
1529             {
1530                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1531                 goto done;
1532             }
1533         }
1534         ERR( "%s\n", debugstr_a(str) );
1535     }
1536  done:
1537     ExitThread(0xff);
1538 }
1539
1540
1541 /***********************************************************************
1542  *           TerminateApp   (TOOLHELP.77)
1543  *
1544  * See "Undocumented Windows".
1545  */
1546 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1547 {
1548     if (hTask && hTask != GetCurrentTask())
1549     {
1550         FIXME("cannot terminate task %x\n", hTask);
1551         return;
1552     }
1553
1554     if (wFlags & NO_UAE_BOX)
1555     {
1556         UINT16 old_mode;
1557         old_mode = SetErrorMode16(0);
1558         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1559     }
1560     FatalAppExit16( 0, NULL );
1561
1562     /* hmm, we're still alive ?? */
1563
1564     /* check undocumented flag */
1565     if (!(wFlags & 0x8000))
1566         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1567
1568     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1569        but let's just call ExitThread */
1570     ExitThread(0xff);
1571 }
1572
1573
1574 /***********************************************************************
1575  *           GetAppCompatFlags   (KERNEL.354)
1576  */
1577 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1578 {
1579     return GetAppCompatFlags( hTask );
1580 }
1581
1582
1583 /***********************************************************************
1584  *           GetAppCompatFlags   (USER32.@)
1585  */
1586 DWORD WINAPI GetAppCompatFlags( HTASK hTask )
1587 {
1588     TDB *pTask;
1589
1590     if (!hTask) hTask = GetCurrentTask();
1591     if (!(pTask=TASK_GetPtr( (HTASK16)hTask ))) return 0;
1592     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1593     return pTask->compat_flags;
1594 }