loader/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8 #include "wine/port.h"
   9
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <assert.h>
  13 #include <unistd.h>
  14
  15 #include "winbase.h"
  16 #include "wingdi.h"
  17 #include "winnt.h"
  18 #include "winuser.h"
  19 #include "winsock.h"
  20
  21 #include "wine/winbase16.h"
  22 #include "drive.h"
  23 #include "file.h"
  24 #include "global.h"
  25 #include "instance.h"
  26 #include "miscemu.h"
  27 #include "module.h"
  28 #include "ntddk.h"
  29 #include "selectors.h"
  30 #include "services.h"
  31 #include "wine/server.h"
  32 #include "syslevel.h"
  33 #include "stackframe.h"
  34 #include "task.h"
  35 #include "thread.h"
  36 #include "toolhelp.h"
  37
  38 #include "debugtools.h"
  39
  40 DEFAULT_DEBUG_CHANNEL(task);
  41 DECLARE_DEBUG_CHANNEL(relay);
  42 DECLARE_DEBUG_CHANNEL(toolhelp);
  43
  44   /* Min. number of thunks allocated when creating a new segment */
  45 #define MIN_THUNKS  32
  46
  47
  48 static THHOOK DefaultThhook;
  49 THHOOK *pThhook = &DefaultThhook;
  50
  51 #define hCurrentTask (pThhook->CurTDB)
  52 #define hFirstTask   (pThhook->HeadTDB)
  53 #define hLockedTask  (pThhook->LockTDB)
  54
  55 static UINT16 nTaskCount = 0;
  56
  57 static HTASK16 initial_task;
  58
  59 /***********************************************************************
  60  *           TASK_InstallTHHook
  61  */
  62 void TASK_InstallTHHook( THHOOK *pNewThhook )
  63 {
  64      THHOOK *pOldThhook = pThhook;
  65
  66      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  67
  68      *pThhook = *pOldThhook;
  69 }
  70
  71 /***********************************************************************
  72  *           TASK_GetNextTask
  73  */
  74 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  75 {
  76     TDB* pTask = TASK_GetPtr( hTask );
  77
  78     if (pTask->hNext) return pTask->hNext;
  79     return (hFirstTask != hTask) ? hFirstTask : 0;
  80 }
  81
  82
  83 /***********************************************************************
  84  *           TASK_GetPtr
  85  */
  86 TDB *TASK_GetPtr( HTASK16 hTask )
  87 {
  88     return GlobalLock16( hTask );
  89 }
  90
  91
  92 /***********************************************************************
  93  *           TASK_GetCurrent
  94  */
  95 TDB *TASK_GetCurrent(void)
  96 {
  97     return TASK_GetPtr( GetCurrentTask() );
  98 }
  99
 100
 101 /***********************************************************************
 102  *           TASK_LinkTask
 103  */
 104 static void TASK_LinkTask( HTASK16 hTask )
 105 {
 106     HTASK16 *prevTask;
 107     TDB *pTask;
 108
 109     if (!(pTask = TASK_GetPtr( hTask ))) return;
 110     prevTask = &hFirstTask;
 111     while (*prevTask)
 112     {
 113         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 114         if (prevTaskPtr->priority >= pTask->priority) break;
 115         prevTask = &prevTaskPtr->hNext;
 116     }
 117     pTask->hNext = *prevTask;
 118     *prevTask = hTask;
 119     nTaskCount++;
 120 }
 121
 122
 123 /***********************************************************************
 124  *           TASK_UnlinkTask
 125  */
 126 static void TASK_UnlinkTask( HTASK16 hTask )
 127 {
 128     HTASK16 *prevTask;
 129     TDB *pTask;
 130
 131     prevTask = &hFirstTask;
 132     while (*prevTask && (*prevTask != hTask))
 133     {
 134         pTask = TASK_GetPtr( *prevTask );
 135         prevTask = &pTask->hNext;
 136     }
 137     if (*prevTask)
 138     {
 139         pTask = TASK_GetPtr( *prevTask );
 140         *prevTask = pTask->hNext;
 141         pTask->hNext = 0;
 142         nTaskCount--;
 143     }
 144 }
 145
 146
 147 /***********************************************************************
 148  *           TASK_CreateThunks
 149  *
 150  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 151  * and containing 'count' entries.
 152  */
 153 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 154 {
 155     int i;
 156     WORD free;
 157     THUNKS *pThunk;
 158
 159     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 160     pThunk->next = 0;
 161     pThunk->magic = THUNK_MAGIC;
 162     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 163     free = pThunk->free;
 164     for (i = 0; i < count-1; i++)
 165     {
 166         free += 8;  /* Offset of next thunk */
 167         pThunk->thunks[4*i] = free;
 168     }
 169     pThunk->thunks[4*i] = 0;  /* Last thunk */
 170 }
 171
 172
 173 /***********************************************************************
 174  *           TASK_AllocThunk
 175  *
 176  * Allocate a thunk for MakeProcInstance().
 177  */
 178 static SEGPTR TASK_AllocThunk(void)
 179 {
 180     TDB *pTask;
 181     THUNKS *pThunk;
 182     WORD sel, base;
 183
 184     if (!(pTask = TASK_GetCurrent())) return 0;
 185     sel = pTask->hCSAlias;
 186     pThunk = &pTask->thunks;
 187     base = (int)pThunk - (int)pTask;
 188     while (!pThunk->free)
 189     {
 190         sel = pThunk->next;
 191         if (!sel)  /* Allocate a new segment */
 192         {
 193             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 194                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 195             if (!sel) return (SEGPTR)0;
 196             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 197             pThunk->next = sel;
 198         }
 199         pThunk = (THUNKS *)GlobalLock16( sel );
 200         base = 0;
 201     }
 202     base += pThunk->free;
 203     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 204     return MAKESEGPTR( sel, base );
 205 }
 206
 207
 208 /***********************************************************************
 209  *           TASK_FreeThunk
 210  *
 211  * Free a MakeProcInstance() thunk.
 212  */
 213 static BOOL TASK_FreeThunk( SEGPTR thunk )
 214 {
 215     TDB *pTask;
 216     THUNKS *pThunk;
 217     WORD sel, base;
 218
 219     if (!(pTask = TASK_GetCurrent())) return 0;
 220     sel = pTask->hCSAlias;
 221     pThunk = &pTask->thunks;
 222     base = (int)pThunk - (int)pTask;
 223     while (sel && (sel != HIWORD(thunk)))
 224     {
 225         sel = pThunk->next;
 226         pThunk = (THUNKS *)GlobalLock16( sel );
 227         base = 0;
 228     }
 229     if (!sel) return FALSE;
 230     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 231     pThunk->free = LOWORD(thunk) - base;
 232     return TRUE;
 233 }
 234
 235
 236 /***********************************************************************
 237  *           TASK_Create
 238  *
 239  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 240  *       to be careful to protect global data structures. We do this
 241  *       by entering the Win16Lock while linking the task into the
 242  *       global task list.
 243  */
 244 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, TEB *teb, LPCSTR cmdline, BYTE len )
 245 {
 246     HTASK16 hTask;
 247     TDB *pTask;
 248     char name[10];
 249
 250       /* Allocate the task structure */
 251
 252     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 253     if (!hTask) return NULL;
 254     pTask = TASK_GetPtr( hTask );
 255     FarSetOwner16( hTask, pModule->self );
 256
 257     /* Fill the task structure */
 258
 259     pTask->hSelf = hTask;
 260
 261     if (teb && teb->tibflags & TEBF_WIN32)
 262     {
 263         pTask->flags        |= TDBF_WIN32;
 264         pTask->hInstance     = pModule->self;
 265         pTask->hPrevInstance = 0;
 266         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 267            in NE_InitProcess */
 268     }
 269
 270     pTask->version       = pModule->expected_version;
 271     pTask->hModule       = pModule->self;
 272     pTask->hParent       = GetCurrentTask();
 273     pTask->magic         = TDB_MAGIC;
 274     pTask->nCmdShow      = cmdShow;
 275     pTask->teb           = teb;
 276     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 277     strcpy( pTask->curdir, "\\" );
 278     lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 279                  sizeof(pTask->curdir) - 1 );
 280
 281       /* Create the thunks block */
 282
 283     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 284
 285       /* Copy the module name */
 286
 287     GetModuleName16( pModule->self, name, sizeof(name) );
 288     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 289
 290       /* Allocate a selector for the PDB */
 291
 292     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 293                                       pModule->self, WINE_LDT_FLAGS_DATA );
 294
 295       /* Fill the PDB */
 296
 297     pTask->pdb.int20 = 0x20cd;
 298     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 299     PUT_UA_DWORD(&pTask->pdb.dispatcher[1],
 300                  (DWORD)GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" ));
 301     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 302     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 303     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 304     pTask->pdb.fileHandlesPtr =
 305         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 306     pTask->pdb.hFileHandles = 0;
 307     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 308     /* FIXME: should we make a copy of the environment? */
 309     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 310     pTask->pdb.nbFiles        = 20;
 311
 312     /* Fill the command line */
 313
 314     if (!cmdline)
 315     {
 316         cmdline = GetCommandLineA();
 317         /* remove the first word (program name) */
 318         if (*cmdline == '"')
 319             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 320         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 321         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 322         len = strlen(cmdline);
 323     }
 324     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 325     pTask->pdb.cmdLine[0] = len;
 326     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 327     /* pTask->pdb.cmdLine[len+1] = 0; */
 328
 329     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 330
 331       /* Get the compatibility flags */
 332
 333     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 334
 335       /* Allocate a code segment alias for the TDB */
 336
 337     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 338                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 339
 340       /* Default DTA overwrites command line */
 341
 342     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 343
 344     /* Create scheduler event for 16-bit tasks */
 345
 346     if ( !(pTask->flags & TDBF_WIN32) )
 347         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 348
 349     /* Enter task handle into thread */
 350
 351     if (teb) teb->htask16 = hTask;
 352     if (!initial_task) initial_task = hTask;
 353
 354     return pTask;
 355 }
 356
 357
 358 /***********************************************************************
 359  *           TASK_DeleteTask
 360  */
 361 static void TASK_DeleteTask( HTASK16 hTask )
 362 {
 363     TDB *pTask;
 364     HGLOBAL16 hPDB;
 365
 366     if (!(pTask = TASK_GetPtr( hTask ))) return;
 367     hPDB = pTask->hPDB;
 368
 369     pTask->magic = 0xdead; /* invalidate signature */
 370
 371     /* Free the selector aliases */
 372
 373     GLOBAL_FreeBlock( pTask->hCSAlias );
 374     GLOBAL_FreeBlock( pTask->hPDB );
 375
 376     /* Free the task module */
 377
 378     FreeModule16( pTask->hModule );
 379
 380     /* Free the task structure itself */
 381
 382     GlobalFree16( hTask );
 383
 384     /* Free all memory used by this task (including the 32-bit stack, */
 385     /* the environment block and the thunk segments). */
 386
 387     GlobalFreeAll16( hPDB );
 388 }
 389
 390
 391 /***********************************************************************
 392  *           TASK_CreateMainTask
 393  *
 394  * Create a task for the main (32-bit) process.
 395  */
 396 void TASK_CreateMainTask(void)
 397 {
 398     TDB *pTask;
 399     STARTUPINFOA startup_info;
 400     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 401
 402     GetStartupInfoA( &startup_info );
 403     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 404     pTask = TASK_Create( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
 405                          cmdShow, NtCurrentTeb(), NULL, 0 );
 406     if (!pTask)
 407     {
 408         ERR("could not create task for main process\n");
 409         ExitProcess(1);
 410     }
 411
 412     /* Add the task to the linked list */
 413     /* (no need to get the win16 lock, we are the only thread at this point) */
 414     TASK_LinkTask( pTask->hSelf );
 415 }
 416
 417
 418 /* startup routine for a new 16-bit thread */
 419 static DWORD CALLBACK task_start( TDB *pTask )
 420 {
 421     DWORD ret;
 422
 423     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 424     NtCurrentTeb()->htask16 = pTask->hSelf;
 425
 426     _EnterWin16Lock();
 427     TASK_LinkTask( pTask->hSelf );
 428     pTask->teb = NtCurrentTeb();
 429     ret = NE_StartTask();
 430     _LeaveWin16Lock();
 431     return ret;
 432 }
 433
 434
 435 /***********************************************************************
 436  *           TASK_SpawnTask
 437  *
 438  * Spawn a new 16-bit task.
 439  */
 440 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 441                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 442 {
 443     TDB *pTask;
 444
 445     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 446     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 447     {
 448         TASK_DeleteTask( pTask->hSelf );
 449         return 0;
 450     }
 451     return pTask->hSelf;
 452 }
 453
 454
 455 /***********************************************************************
 456  *           TASK_ExitTask
 457  */
 458 void TASK_ExitTask(void)
 459 {
 460     TDB *pTask;
 461     DWORD lockCount;
 462
 463     /* Enter the Win16Lock to protect global data structures */
 464     _EnterWin16Lock();
 465
 466     pTask = TASK_GetCurrent();
 467     if ( !pTask )
 468     {
 469         _LeaveWin16Lock();
 470         return;
 471     }
 472
 473     TRACE("Killing task %04x\n", pTask->hSelf );
 474
 475     /* Perform USER cleanup */
 476
 477     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 478     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 479     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 480     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 481
 482     /* Remove the task from the list to be sure we never switch back to it */
 483     TASK_UnlinkTask( pTask->hSelf );
 484
 485     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 486     {
 487         TRACE("this is the last task, exiting\n" );
 488         ExitKernel16();
 489     }
 490
 491     if( nTaskCount )
 492     {
 493         TDB* p = TASK_GetPtr( hFirstTask );
 494         while( p )
 495         {
 496             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 497             p = TASK_GetPtr( p->hNext );
 498         }
 499     }
 500
 501     pTask->nEvents = 0;
 502
 503     if ( hLockedTask == pTask->hSelf )
 504         hLockedTask = 0;
 505
 506     TASK_DeleteTask( pTask->hSelf );
 507
 508     /* ... and completely release the Win16Lock, just in case. */
 509     ReleaseThunkLock( &lockCount );
 510 }
 511
 512
 513 /***********************************************************************
 514  *           InitTask  (KERNEL.91)
 515  *
 516  * Called by the application startup code.
 517  */
 518 void WINAPI InitTask16( CONTEXT86 *context )
 519 {
 520     TDB *pTask;
 521     INSTANCEDATA *pinstance;
 522     SEGPTR ptr;
 523
 524     context->Eax = 0;
 525     if (!(pTask = TASK_GetCurrent())) return;
 526
 527     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 528        as some apps, notably Visual Basic apps, *modify* the heap/stack
 529        size of the instance data segment before calling InitTask() */
 530
 531     /* Initialize the INSTANCEDATA structure */
 532     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 533     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 534     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 535     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 536                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 537
 538     /* Initialize the local heap */
 539     if (LOWORD(context->Ecx))
 540         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 541
 542     /* Initialize implicitly loaded DLLs */
 543     NE_InitializeDLLs( pTask->hModule );
 544     NE_DllProcessAttach( pTask->hModule );
 545
 546     /* Registers on return are:
 547      * ax     1 if OK, 0 on error
 548      * cx     stack limit in bytes
 549      * dx     cmdShow parameter
 550      * si     instance handle of the previous instance
 551      * di     instance handle of the new task
 552      * es:bx  pointer to command line inside PSP
 553      *
 554      * 0 (=%bp) is pushed on the stack
 555      */
 556     ptr = stack16_push( sizeof(WORD) );
 557     *(WORD *)MapSL(ptr) = 0;
 558     context->Esp -= 2;
 559
 560     context->Eax = 1;
 561
 562     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 563     else
 564     {
 565         LPBYTE p = &pTask->pdb.cmdLine[1];
 566         while ((*p == ' ') || (*p == '\t')) p++;
 567         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 568     }
 569     context->Ecx   = pinstance->stacktop;
 570     context->Edx   = pTask->nCmdShow;
 571     context->Esi   = (DWORD)pTask->hPrevInstance;
 572     context->Edi   = (DWORD)pTask->hInstance;
 573     context->SegEs = (WORD)pTask->hPDB;
 574 }
 575
 576
 577 /***********************************************************************
 578  *           WaitEvent  (KERNEL.30)
 579  */
 580 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 581 {
 582     TDB *pTask;
 583
 584     if (!hTask) hTask = GetCurrentTask();
 585     pTask = TASK_GetPtr( hTask );
 586
 587     if (pTask->flags & TDBF_WIN32)
 588     {
 589         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 590         return TRUE;
 591     }
 592
 593     if (pTask->nEvents > 0)
 594     {
 595         pTask->nEvents--;
 596         return FALSE;
 597     }
 598
 599     if (pTask->teb == NtCurrentTeb())
 600     {
 601         DWORD lockCount;
 602
 603         NtResetEvent( pTask->hEvent, NULL );
 604         ReleaseThunkLock( &lockCount );
 605         SYSLEVEL_CheckNotLevel( 1 );
 606         WaitForSingleObject( pTask->hEvent, INFINITE );
 607         RestoreThunkLock( lockCount );
 608         if (pTask->nEvents > 0) pTask->nEvents--;
 609     }
 610     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 611
 612     return TRUE;
 613 }
 614
 615
 616 /***********************************************************************
 617  *           PostEvent  (KERNEL.31)
 618  */
 619 void WINAPI PostEvent16( HTASK16 hTask )
 620 {
 621     TDB *pTask;
 622
 623     if (!hTask) hTask = GetCurrentTask();
 624     if (!(pTask = TASK_GetPtr( hTask ))) return;
 625
 626     if (pTask->flags & TDBF_WIN32)
 627     {
 628         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 629         return;
 630     }
 631
 632     pTask->nEvents++;
 633
 634     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 635 }
 636
 637
 638 /***********************************************************************
 639  *           SetPriority  (KERNEL.32)
 640  */
 641 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 642 {
 643     TDB *pTask;
 644     INT16 newpriority;
 645
 646     if (!hTask) hTask = GetCurrentTask();
 647     if (!(pTask = TASK_GetPtr( hTask ))) return;
 648     newpriority = pTask->priority + delta;
 649     if (newpriority < -32) newpriority = -32;
 650     else if (newpriority > 15) newpriority = 15;
 651
 652     pTask->priority = newpriority + 1;
 653     TASK_UnlinkTask( pTask->hSelf );
 654     TASK_LinkTask( pTask->hSelf );
 655     pTask->priority--;
 656 }
 657
 658
 659 /***********************************************************************
 660  *           LockCurrentTask  (KERNEL.33)
 661  */
 662 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 663 {
 664     if (bLock) hLockedTask = GetCurrentTask();
 665     else hLockedTask = 0;
 666     return hLockedTask;
 667 }
 668
 669
 670 /***********************************************************************
 671  *           IsTaskLocked  (KERNEL.122)
 672  */
 673 HTASK16 WINAPI IsTaskLocked16(void)
 674 {
 675     return hLockedTask;
 676 }
 677
 678
 679 /***********************************************************************
 680  *           OldYield  (KERNEL.117)
 681  */
 682 void WINAPI OldYield16(void)
 683 {
 684    DWORD count;
 685
 686    ReleaseThunkLock(&count);
 687    RestoreThunkLock(count);
 688 }
 689
 690 /***********************************************************************
 691  *           WIN32_OldYield  (KERNEL.447)
 692  */
 693 void WINAPI WIN32_OldYield16(void)
 694 {
 695    DWORD count;
 696
 697    ReleaseThunkLock(&count);
 698    RestoreThunkLock(count);
 699 }
 700
 701 /***********************************************************************
 702  *           DirectedYield  (KERNEL.150)
 703  */
 704 void WINAPI DirectedYield16( HTASK16 hTask )
 705 {
 706     TDB *pCurTask = TASK_GetCurrent();
 707
 708     if (pCurTask->flags & TDBF_WIN32)
 709     {
 710         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 711         return;
 712     }
 713
 714     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 715
 716     pCurTask->hYieldTo = hTask;
 717     OldYield16();
 718
 719     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 720 }
 721
 722 /***********************************************************************
 723  *           Yield  (KERNEL.29)
 724  */
 725 void WINAPI Yield16(void)
 726 {
 727     TDB *pCurTask = TASK_GetCurrent();
 728
 729     if (pCurTask) pCurTask->hYieldTo = 0;
 730     if (pCurTask && pCurTask->hQueue)
 731     {
 732         HMODULE mod = GetModuleHandleA( "user32.dll" );
 733         if (mod)
 734         {
 735             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 736             if (proc)
 737             {
 738                 proc();
 739                 return;
 740             }
 741         }
 742     }
 743     OldYield16();
 744 }
 745
 746 /***********************************************************************
 747  *           KERNEL_490  (KERNEL.490)
 748  */
 749 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 750 {
 751     if ( !someTask ) return 0;
 752
 753     FIXME("(%04x): stub\n", someTask );
 754     return 0;
 755 }
 756
 757 /***********************************************************************
 758  *           MakeProcInstance  (KERNEL.51)
 759  */
 760 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 761 {
 762     BYTE *thunk,*lfunc;
 763     SEGPTR thunkaddr;
 764     WORD hInstanceSelector;
 765
 766     hInstanceSelector = GlobalHandleToSel16(hInstance);
 767
 768     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 769
 770     if (!HIWORD(func)) {
 771       /* Win95 actually protects via SEH, but this is better for debugging */
 772       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 773       return (FARPROC16)0;
 774     }
 775
 776     if (hInstance)
 777     {
 778         if ( (!(hInstance & 4)) ||
 779              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 780         {
 781             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 782                 hInstance);
 783             return 0;
 784         }
 785     }
 786
 787     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 788       && (hInstance != 0)
 789       && (hInstance != 0xffff) )
 790     {
 791         /* calling MPI with a foreign DSEG is invalid ! */
 792         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 793                    hInstance,CURRENT_DS);
 794     }
 795
 796     /* Always use the DSEG that MPI was entered with.
 797      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 798      * as CURRENT_DS provides the DSEG value we need.
 799      * ("calling" DS, *not* "task" DS !) */
 800     hInstanceSelector = CURRENT_DS;
 801     hInstance = GlobalHandle16(hInstanceSelector);
 802
 803     /* no thunking for DLLs */
 804     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 805         return func;
 806
 807     thunkaddr = TASK_AllocThunk();
 808     if (!thunkaddr) return (FARPROC16)0;
 809     thunk = MapSL( thunkaddr );
 810     lfunc = MapSL( (SEGPTR)func );
 811
 812     TRACE("(%08lx,%04x): got thunk %08lx\n",
 813           (DWORD)func, hInstance, (DWORD)thunkaddr );
 814     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 815         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 816     ) {
 817         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 818     }
 819
 820     *thunk++ = 0xb8;    /* movw instance, %ax */
 821     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 822     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 823     *thunk++ = 0xea;    /* ljmp func */
 824     *(DWORD *)thunk = (DWORD)func;
 825     return (FARPROC16)thunkaddr;
 826     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 827 }
 828
 829
 830 /***********************************************************************
 831  *           FreeProcInstance  (KERNEL.52)
 832  */
 833 void WINAPI FreeProcInstance16( FARPROC16 func )
 834 {
 835     TRACE("(%08lx)\n", (DWORD)func );
 836     TASK_FreeThunk( (SEGPTR)func );
 837 }
 838
 839 /**********************************************************************
 840  *          TASK_GetCodeSegment
 841  *
 842  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 843  * and logical segment number of a given code segment.
 844  *
 845  * 'proc' either *is* already a pair of module handle and segment number,
 846  * in which case there's nothing to do.  Otherwise, it is a pointer to
 847  * a function, and we need to retrieve the code segment.  If the pointer
 848  * happens to point to a thunk, we'll retrieve info about the code segment
 849  * where the function pointed to by the thunk resides, not the thunk itself.
 850  *
 851  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 852  *        the function the snoop code will return to ...
 853  *
 854  */
 855 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 856                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 857 {
 858     NE_MODULE *pModule = NULL;
 859     SEGTABLEENTRY *pSeg = NULL;
 860     int segNr=0;
 861
 862     /* Try pair of module handle / segment number */
 863     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 864     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 865     {
 866         segNr = LOWORD( proc );
 867         if ( segNr && segNr <= pModule->seg_count )
 868             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 869     }
 870
 871     /* Try thunk or function */
 872     else
 873     {
 874         BYTE *thunk = MapSL( (SEGPTR)proc );
 875         WORD selector;
 876
 877         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 878             selector = thunk[6] + (thunk[7] << 8);
 879         else
 880             selector = HIWORD( proc );
 881
 882         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 883         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 884
 885         if ( pModule )
 886             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 887                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 888                     break;
 889
 890         if ( pModule && segNr > pModule->seg_count )
 891             pSeg = NULL;
 892     }
 893
 894     /* Abort if segment not found */
 895
 896     if ( !pModule || !pSeg )
 897         return FALSE;
 898
 899     /* Return segment data */
 900
 901     if ( ppModule ) *ppModule = pModule;
 902     if ( ppSeg    ) *ppSeg    = pSeg;
 903     if ( pSegNr   ) *pSegNr   = segNr;
 904
 905     return TRUE;
 906 }
 907
 908 /**********************************************************************
 909  *          GetCodeHandle    (KERNEL.93)
 910  */
 911 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 912 {
 913     SEGTABLEENTRY *pSeg;
 914
 915     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 916         return (HANDLE16)0;
 917
 918     return pSeg->hSeg;
 919 }
 920
 921 /**********************************************************************
 922  *          GetCodeInfo    (KERNEL.104)
 923  */
 924 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 925 {
 926     NE_MODULE *pModule;
 927     SEGTABLEENTRY *pSeg;
 928     int segNr;
 929
 930     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 931         return FALSE;
 932
 933     /* Fill in segment information */
 934
 935     segInfo->offSegment = pSeg->filepos;
 936     segInfo->cbSegment  = pSeg->size;
 937     segInfo->flags      = pSeg->flags;
 938     segInfo->cbAlloc    = pSeg->minsize;
 939     segInfo->h          = pSeg->hSeg;
 940     segInfo->alignShift = pModule->alignment;
 941
 942     if ( segNr == pModule->dgroup )
 943         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 944
 945     /* Return module handle in %es */
 946
 947     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 948
 949     return TRUE;
 950 }
 951
 952
 953 /**********************************************************************
 954  *          DefineHandleTable    (KERNEL.94)
 955  */
 956 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 957 {
 958     FIXME("(%04x): stub ?\n", wOffset);
 959     return TRUE;
 960 }
 961
 962
 963 /***********************************************************************
 964  *           SetTaskQueue  (KERNEL.34)
 965  */
 966 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 967 {
 968     HQUEUE16 hPrev;
 969     TDB *pTask;
 970
 971     if (!hTask) hTask = GetCurrentTask();
 972     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 973
 974     hPrev = pTask->hQueue;
 975     pTask->hQueue = hQueue;
 976
 977     return hPrev;
 978 }
 979
 980
 981 /***********************************************************************
 982  *           GetTaskQueue  (KERNEL.35)
 983  */
 984 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
 985 {
 986     TDB *pTask;
 987
 988     if (!hTask) hTask = GetCurrentTask();
 989     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 990     return pTask->hQueue;
 991 }
 992
 993 /***********************************************************************
 994  *           SetThreadQueue  (KERNEL.463)
 995  */
 996 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
 997 {
 998     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
 999     HQUEUE16 oldQueue = teb? teb->queue : 0;
1000
1001     if ( teb )
1002     {
1003         teb->queue = hQueue;
1004
1005         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1006             SetTaskQueue16( teb->htask16, hQueue );
1007     }
1008
1009     return oldQueue;
1010 }
1011
1012 /***********************************************************************
1013  *           GetThreadQueue  (KERNEL.464)
1014  */
1015 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1016 {
1017     TEB *teb = NULL;
1018     if ( !thread )
1019         teb = NtCurrentTeb();
1020     else if ( HIWORD(thread) )
1021         teb = THREAD_IdToTEB( thread );
1022     else if ( IsTask16( (HTASK16)thread ) )
1023         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1024
1025     return (HQUEUE16)(teb? teb->queue : 0);
1026 }
1027
1028 /***********************************************************************
1029  *           SetFastQueue  (KERNEL.624)
1030  */
1031 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1032 {
1033     TEB *teb = NULL;
1034     if ( !thread )
1035         teb = NtCurrentTeb();
1036     else if ( HIWORD(thread) )
1037         teb = THREAD_IdToTEB( thread );
1038     else if ( IsTask16( (HTASK16)thread ) )
1039         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1040
1041     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1042 }
1043
1044 /***********************************************************************
1045  *           GetFastQueue  (KERNEL.625)
1046  */
1047 HANDLE WINAPI GetFastQueue16( void )
1048 {
1049     HANDLE ret = (HANDLE)NtCurrentTeb()->queue;
1050
1051     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1052     return ret;
1053 }
1054
1055 /***********************************************************************
1056  *           SwitchStackTo   (KERNEL.108)
1057  */
1058 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1059 {
1060     TDB *pTask;
1061     STACK16FRAME *oldFrame, *newFrame;
1062     INSTANCEDATA *pData;
1063     UINT16 copySize;
1064
1065     if (!(pTask = TASK_GetCurrent())) return;
1066     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1067     TRACE("old=%04x:%04x new=%04x:%04x\n",
1068           SELECTOROF( pTask->teb->cur_stack ),
1069           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1070
1071     /* Save the old stack */
1072
1073     oldFrame = THREAD_STACK16( pTask->teb );
1074     /* pop frame + args and push bp */
1075     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1076                            + 2 * sizeof(WORD);
1077     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1078     pData->stacktop    = top;
1079     pData->stackmin    = ptr;
1080     pData->stackbottom = ptr;
1081
1082     /* Switch to the new stack */
1083
1084     /* Note: we need to take the 3 arguments into account; otherwise,
1085      * the stack will underflow upon return from this function.
1086      */
1087     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1088     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1089     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1090     newFrame = THREAD_STACK16( pTask->teb );
1091
1092     /* Copy the stack frame and the local variables to the new stack */
1093
1094     memmove( newFrame, oldFrame, copySize );
1095     newFrame->bp = ptr;
1096     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1097 }
1098
1099
1100 /***********************************************************************
1101  *           SwitchStackBack   (KERNEL.109)
1102  */
1103 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1104 {
1105     STACK16FRAME *oldFrame, *newFrame;
1106     INSTANCEDATA *pData;
1107
1108     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1109         return;
1110     if (!pData->old_ss_sp)
1111     {
1112         WARN("No previous SwitchStackTo\n" );
1113         return;
1114     }
1115     TRACE("restoring stack %04x:%04x\n",
1116           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1117
1118     oldFrame = CURRENT_STACK16;
1119
1120     /* Pop bp from the previous stack */
1121
1122     BP_reg(context) = *(WORD *)MapSL(pData->old_ss_sp);
1123     pData->old_ss_sp += sizeof(WORD);
1124
1125     /* Switch back to the old stack */
1126
1127     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1128     context->SegSs = SELECTOROF(pData->old_ss_sp);
1129     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1130     pData->old_ss_sp = 0;
1131
1132     /* Build a stack frame for the return */
1133
1134     newFrame = CURRENT_STACK16;
1135     newFrame->frame32     = oldFrame->frame32;
1136     newFrame->module_cs   = oldFrame->module_cs;
1137     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1138     newFrame->entry_ip    = oldFrame->entry_ip;
1139 }
1140
1141
1142 /***********************************************************************
1143  *           GetTaskQueueDS  (KERNEL.118)
1144  */
1145 void WINAPI GetTaskQueueDS16(void)
1146 {
1147     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1148 }
1149
1150
1151 /***********************************************************************
1152  *           GetTaskQueueES  (KERNEL.119)
1153  */
1154 void WINAPI GetTaskQueueES16(void)
1155 {
1156     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1157 }
1158
1159
1160 /***********************************************************************
1161  *           GetCurrentTask   (KERNEL32.@)
1162  */
1163 HTASK16 WINAPI GetCurrentTask(void)
1164 {
1165     return NtCurrentTeb()->htask16;
1166 }
1167
1168 /***********************************************************************
1169  *           GetCurrentTask   (KERNEL.36)
1170  */
1171 DWORD WINAPI WIN16_GetCurrentTask(void)
1172 {
1173     /* This is the version used by relay code; the first task is */
1174     /* returned in the high word of the result */
1175     return MAKELONG( GetCurrentTask(), hFirstTask );
1176 }
1177
1178
1179 /***********************************************************************
1180  *           GetCurrentPDB   (KERNEL.37)
1181  *
1182  * UNDOC: returns PSP of KERNEL in high word
1183  */
1184 DWORD WINAPI GetCurrentPDB16(void)
1185 {
1186     TDB *pTask;
1187
1188     if (!(pTask = TASK_GetCurrent())) return 0;
1189     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1190 }
1191
1192
1193 /***********************************************************************
1194  *           GetCurPID   (KERNEL.157)
1195  */
1196 DWORD WINAPI GetCurPID16( DWORD unused )
1197 {
1198     return 0;
1199 }
1200
1201
1202 /***********************************************************************
1203  *           GetInstanceData   (KERNEL.54)
1204  */
1205 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1206 {
1207     char *ptr = (char *)GlobalLock16( instance );
1208     if (!ptr || !len) return 0;
1209     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1210     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1211     return len;
1212 }
1213
1214
1215 /***********************************************************************
1216  *           GetExeVersion   (KERNEL.105)
1217  */
1218 WORD WINAPI GetExeVersion16(void)
1219 {
1220     TDB *pTask;
1221
1222     if (!(pTask = TASK_GetCurrent())) return 0;
1223     return pTask->version;
1224 }
1225
1226
1227 /***********************************************************************
1228  *           SetErrorMode   (KERNEL.107)
1229  */
1230 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1231 {
1232     TDB *pTask;
1233     if (!(pTask = TASK_GetCurrent())) return 0;
1234     pTask->error_mode = mode;
1235     return SetErrorMode( mode );
1236 }
1237
1238
1239 /***********************************************************************
1240  *           GetNumTasks   (KERNEL.152)
1241  */
1242 UINT16 WINAPI GetNumTasks16(void)
1243 {
1244     return nTaskCount;
1245 }
1246
1247
1248 /***********************************************************************
1249  *           GetTaskDS   (KERNEL.155)
1250  *
1251  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1252  * I don't think we need to bother with this.
1253  */
1254 HINSTANCE16 WINAPI GetTaskDS16(void)
1255 {
1256     TDB *pTask;
1257
1258     if (!(pTask = TASK_GetCurrent())) return 0;
1259     return GlobalHandleToSel16(pTask->hInstance);
1260 }
1261
1262 /***********************************************************************
1263  *           GetDummyModuleHandleDS   (KERNEL.602)
1264  */
1265 WORD WINAPI GetDummyModuleHandleDS16(void)
1266 {
1267     TDB *pTask;
1268     WORD selector;
1269
1270     if (!(pTask = TASK_GetCurrent())) return 0;
1271     if (!(pTask->flags & TDBF_WIN32)) return 0;
1272     selector = GlobalHandleToSel16( pTask->hModule );
1273     CURRENT_DS = selector;
1274     return selector;
1275 }
1276
1277 /***********************************************************************
1278  *           IsTask   (KERNEL.320)
1279  *           IsTask16 (KERNEL32.@)
1280  */
1281 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1282 {
1283     TDB *pTask;
1284
1285     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1286     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1287     return (pTask->magic == TDB_MAGIC);
1288 }
1289
1290
1291 /***********************************************************************
1292  *           IsWinOldApTask   (KERNEL.158)
1293  */
1294 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1295 {
1296     /* should return bit 0 of byte 0x48 in PSP */
1297     return FALSE;
1298 }
1299
1300 /***********************************************************************
1301  *           SetTaskSignalProc   (KERNEL.38)
1302  */
1303 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1304 {
1305     TDB *pTask;
1306     FARPROC16 oldProc;
1307
1308     if (!hTask) hTask = GetCurrentTask();
1309     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1310     oldProc = pTask->userhandler;
1311     pTask->userhandler = proc;
1312     return oldProc;
1313 }
1314
1315 /***********************************************************************
1316  *           TASK_CallTaskSignalProc
1317  */
1318 /* ### start build ### */
1319 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1320 /* ### stop build ### */
1321 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1322 {
1323     TDB *pTask = TASK_GetCurrent();
1324     if ( !pTask || !pTask->userhandler ) return;
1325
1326     TASK_CallTo16_word_wwwww( pTask->userhandler,
1327                               hTaskOrModule, uCode, 0,
1328                               pTask->hInstance, pTask->hQueue );
1329 }
1330
1331 /***********************************************************************
1332  *           SetSigHandler   (KERNEL.140)
1333  */
1334 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1335                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1336 {
1337     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1338           newhandler,oldhandler,oldmode,newmode,flag );
1339
1340     if (flag != 1) return 0;
1341     if (!newmode) newhandler = NULL;  /* Default handler */
1342     if (newmode != 4)
1343     {
1344         TDB *pTask;
1345
1346         if (!(pTask = TASK_GetCurrent())) return 0;
1347         if (oldmode) *oldmode = pTask->signal_flags;
1348         pTask->signal_flags = newmode;
1349         if (oldhandler) *oldhandler = pTask->sighandler;
1350         pTask->sighandler = newhandler;
1351     }
1352     return 0;
1353 }
1354
1355
1356 /***********************************************************************
1357  *           GlobalNotify   (KERNEL.154)
1358  *
1359  * Note that GlobalNotify does _not_ return the old NotifyProc
1360  * -- contrary to LocalNotify !!
1361  */
1362 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1363 {
1364     TDB *pTask;
1365
1366     if (!(pTask = TASK_GetCurrent())) return;
1367     pTask->discardhandler = proc;
1368 }
1369
1370
1371 /***********************************************************************
1372  *           GetExePtrHelper
1373  */
1374 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1375 {
1376     char *ptr;
1377     HANDLE16 owner;
1378
1379       /* Check for module handle */
1380
1381     if (!(ptr = GlobalLock16( handle ))) return 0;
1382     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1383
1384       /* Search for this handle inside all tasks */
1385
1386     *hTask = hFirstTask;
1387     while (*hTask)
1388     {
1389         TDB *pTask = TASK_GetPtr( *hTask );
1390         if ((*hTask == handle) ||
1391             (pTask->hInstance == handle) ||
1392             (pTask->hQueue == handle) ||
1393             (pTask->hPDB == handle)) return pTask->hModule;
1394         *hTask = pTask->hNext;
1395     }
1396
1397       /* Check the owner for module handle */
1398
1399     owner = FarGetOwner16( handle );
1400     if (!(ptr = GlobalLock16( owner ))) return 0;
1401     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1402
1403       /* Search for the owner inside all tasks */
1404
1405     *hTask = hFirstTask;
1406     while (*hTask)
1407     {
1408         TDB *pTask = TASK_GetPtr( *hTask );
1409         if ((*hTask == owner) ||
1410             (pTask->hInstance == owner) ||
1411             (pTask->hQueue == owner) ||
1412             (pTask->hPDB == owner)) return pTask->hModule;
1413         *hTask = pTask->hNext;
1414     }
1415
1416     return 0;
1417 }
1418
1419 /***********************************************************************
1420  *           GetExePtr   (KERNEL.133)
1421  */
1422 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1423 {
1424     HTASK16 hTask = 0;
1425     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1426     STACK16FRAME *frame = CURRENT_STACK16;
1427     frame->ecx = hModule;
1428     if (hTask) frame->es = hTask;
1429     return hModule;
1430 }
1431
1432
1433 /***********************************************************************
1434  *           K228   (KERNEL.228)
1435  */
1436 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1437 {
1438     HTASK16 hTask = 0;
1439     return GetExePtrHelper( handle, &hTask );
1440 }
1441
1442
1443 /***********************************************************************
1444  *           TaskFirst   (TOOLHELP.63)
1445  */
1446 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1447 {
1448     lpte->hNext = hFirstTask;
1449     return TaskNext16( lpte );
1450 }
1451
1452
1453 /***********************************************************************
1454  *           TaskNext   (TOOLHELP.64)
1455  */
1456 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1457 {
1458     TDB *pTask;
1459     INSTANCEDATA *pInstData;
1460
1461     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1462     if (!lpte->hNext) return FALSE;
1463
1464     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1465     while (1) {
1466         pTask = TASK_GetPtr( lpte->hNext );
1467         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1468         if (pTask->hInstance)
1469             break;
1470         lpte->hNext = pTask->hNext;
1471     }
1472     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1473     lpte->hTask         = lpte->hNext;
1474     lpte->hTaskParent   = pTask->hParent;
1475     lpte->hInst         = pTask->hInstance;
1476     lpte->hModule       = pTask->hModule;
1477     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1478     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1479     lpte->wStackTop     = pInstData->stacktop;
1480     lpte->wStackMinimum = pInstData->stackmin;
1481     lpte->wStackBottom  = pInstData->stackbottom;
1482     lpte->wcEvents      = pTask->nEvents;
1483     lpte->hQueue        = pTask->hQueue;
1484     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1485     lpte->wPSPOffset    = 0x100;  /*??*/
1486     lpte->hNext         = pTask->hNext;
1487     return TRUE;
1488 }
1489
1490
1491 /***********************************************************************
1492  *           TaskFindHandle   (TOOLHELP.65)
1493  */
1494 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1495 {
1496     lpte->hNext = hTask;
1497     return TaskNext16( lpte );
1498 }
1499
1500
1501 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1502
1503 /**************************************************************************
1504  *           FatalAppExit   (KERNEL.137)
1505  */
1506 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1507 {
1508     TDB *pTask = TASK_GetCurrent();
1509
1510     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1511     {
1512         HMODULE mod = GetModuleHandleA( "user32.dll" );
1513         if (mod)
1514         {
1515             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1516             if (pMessageBoxA)
1517             {
1518                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1519                 goto done;
1520             }
1521         }
1522         ERR( "%s\n", debugstr_a(str) );
1523     }
1524  done:
1525     ExitThread(0xff);
1526 }
1527
1528
1529 /***********************************************************************
1530  *           TerminateApp   (TOOLHELP.77)
1531  *
1532  * See "Undocumented Windows".
1533  */
1534 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1535 {
1536     if (hTask && hTask != GetCurrentTask())
1537     {
1538         FIXME("cannot terminate task %x\n", hTask);
1539         return;
1540     }
1541
1542     if (wFlags & NO_UAE_BOX)
1543     {
1544         UINT16 old_mode;
1545         old_mode = SetErrorMode16(0);
1546         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1547     }
1548     FatalAppExit16( 0, NULL );
1549
1550     /* hmm, we're still alive ?? */
1551
1552     /* check undocumented flag */
1553     if (!(wFlags & 0x8000))
1554         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1555
1556     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1557        but let's just call ExitThread */
1558     ExitThread(0xff);
1559 }
1560
1561
1562 /***********************************************************************
1563  *           GetAppCompatFlags   (KERNEL.354)
1564  */
1565 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1566 {
1567     return GetAppCompatFlags( hTask );
1568 }
1569
1570
1571 /***********************************************************************
1572  *           GetAppCompatFlags   (USER32.@)
1573  */
1574 DWORD WINAPI GetAppCompatFlags( HTASK hTask )
1575 {
1576     TDB *pTask;
1577
1578     if (!hTask) hTask = GetCurrentTask();
1579     if (!(pTask=TASK_GetPtr( (HTASK16)hTask ))) return 0;
1580     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1581     return pTask->compat_flags;
1582 }