loader/task.c

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