loader/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <assert.h>
  27 #ifdef HAVE_UNISTD_H
  28 # include <unistd.h>
  29 #endif
  30
  31 #include "winbase.h"
  32 #include "wingdi.h"
  33 #include "winnt.h"
  34 #include "winuser.h"
  35
  36 #include "wine/winbase16.h"
  37 #include "drive.h"
  38 #include "file.h"
  39 #include "global.h"
  40 #include "instance.h"
  41 #include "module.h"
  42 #include "winternl.h"
  43 #include "selectors.h"
  44 #include "wine/server.h"
  45 #include "syslevel.h"
  46 #include "stackframe.h"
  47 #include "task.h"
  48 #include "thread.h"
  49 #include "toolhelp.h"
  50
  51 #include "wine/debug.h"
  52
  53 WINE_DEFAULT_DEBUG_CHANNEL(task);
  54 WINE_DECLARE_DEBUG_CHANNEL(relay);
  55 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  56
  57   /* Min. number of thunks allocated when creating a new segment */
  58 #define MIN_THUNKS  32
  59
  60
  61 static THHOOK DefaultThhook;
  62 THHOOK *pThhook = &DefaultThhook;
  63
  64 #define hCurrentTask (pThhook->CurTDB)
  65 #define hFirstTask   (pThhook->HeadTDB)
  66 #define hLockedTask  (pThhook->LockTDB)
  67
  68 static UINT16 nTaskCount = 0;
  69
  70 static HTASK16 initial_task;
  71
  72 /***********************************************************************
  73  *           TASK_InstallTHHook
  74  */
  75 void TASK_InstallTHHook( THHOOK *pNewThhook )
  76 {
  77      THHOOK *pOldThhook = pThhook;
  78
  79      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  80
  81      *pThhook = *pOldThhook;
  82 }
  83
  84 /***********************************************************************
  85  *           TASK_GetNextTask
  86  */
  87 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  88 {
  89     TDB* pTask = TASK_GetPtr( hTask );
  90
  91     if (pTask->hNext) return pTask->hNext;
  92     return (hFirstTask != hTask) ? hFirstTask : 0;
  93 }
  94
  95
  96 /***********************************************************************
  97  *           TASK_GetPtr
  98  */
  99 TDB *TASK_GetPtr( HTASK16 hTask )
 100 {
 101     return GlobalLock16( hTask );
 102 }
 103
 104
 105 /***********************************************************************
 106  *           TASK_GetCurrent
 107  */
 108 TDB *TASK_GetCurrent(void)
 109 {
 110     return TASK_GetPtr( GetCurrentTask() );
 111 }
 112
 113
 114 /***********************************************************************
 115  *           TASK_LinkTask
 116  */
 117 static void TASK_LinkTask( HTASK16 hTask )
 118 {
 119     HTASK16 *prevTask;
 120     TDB *pTask;
 121
 122     if (!(pTask = TASK_GetPtr( hTask ))) return;
 123     prevTask = &hFirstTask;
 124     while (*prevTask)
 125     {
 126         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 127         if (prevTaskPtr->priority >= pTask->priority) break;
 128         prevTask = &prevTaskPtr->hNext;
 129     }
 130     pTask->hNext = *prevTask;
 131     *prevTask = hTask;
 132     nTaskCount++;
 133 }
 134
 135
 136 /***********************************************************************
 137  *           TASK_UnlinkTask
 138  */
 139 static void TASK_UnlinkTask( HTASK16 hTask )
 140 {
 141     HTASK16 *prevTask;
 142     TDB *pTask;
 143
 144     prevTask = &hFirstTask;
 145     while (*prevTask && (*prevTask != hTask))
 146     {
 147         pTask = TASK_GetPtr( *prevTask );
 148         prevTask = &pTask->hNext;
 149     }
 150     if (*prevTask)
 151     {
 152         pTask = TASK_GetPtr( *prevTask );
 153         *prevTask = pTask->hNext;
 154         pTask->hNext = 0;
 155         nTaskCount--;
 156     }
 157 }
 158
 159
 160 /***********************************************************************
 161  *           TASK_CreateThunks
 162  *
 163  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 164  * and containing 'count' entries.
 165  */
 166 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 167 {
 168     int i;
 169     WORD free;
 170     THUNKS *pThunk;
 171
 172     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 173     pThunk->next = 0;
 174     pThunk->magic = THUNK_MAGIC;
 175     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 176     free = pThunk->free;
 177     for (i = 0; i < count-1; i++)
 178     {
 179         free += 8;  /* Offset of next thunk */
 180         pThunk->thunks[4*i] = free;
 181     }
 182     pThunk->thunks[4*i] = 0;  /* Last thunk */
 183 }
 184
 185
 186 /***********************************************************************
 187  *           TASK_AllocThunk
 188  *
 189  * Allocate a thunk for MakeProcInstance().
 190  */
 191 static SEGPTR TASK_AllocThunk(void)
 192 {
 193     TDB *pTask;
 194     THUNKS *pThunk;
 195     WORD sel, base;
 196
 197     if (!(pTask = TASK_GetCurrent())) return 0;
 198     sel = pTask->hCSAlias;
 199     pThunk = &pTask->thunks;
 200     base = (int)pThunk - (int)pTask;
 201     while (!pThunk->free)
 202     {
 203         sel = pThunk->next;
 204         if (!sel)  /* Allocate a new segment */
 205         {
 206             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 207                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 208             if (!sel) return (SEGPTR)0;
 209             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 210             pThunk->next = sel;
 211         }
 212         pThunk = (THUNKS *)GlobalLock16( sel );
 213         base = 0;
 214     }
 215     base += pThunk->free;
 216     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 217     return MAKESEGPTR( sel, base );
 218 }
 219
 220
 221 /***********************************************************************
 222  *           TASK_FreeThunk
 223  *
 224  * Free a MakeProcInstance() thunk.
 225  */
 226 static BOOL TASK_FreeThunk( SEGPTR thunk )
 227 {
 228     TDB *pTask;
 229     THUNKS *pThunk;
 230     WORD sel, base;
 231
 232     if (!(pTask = TASK_GetCurrent())) return 0;
 233     sel = pTask->hCSAlias;
 234     pThunk = &pTask->thunks;
 235     base = (int)pThunk - (int)pTask;
 236     while (sel && (sel != HIWORD(thunk)))
 237     {
 238         sel = pThunk->next;
 239         pThunk = (THUNKS *)GlobalLock16( sel );
 240         base = 0;
 241     }
 242     if (!sel) return FALSE;
 243     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 244     pThunk->free = LOWORD(thunk) - base;
 245     return TRUE;
 246 }
 247
 248
 249 /***********************************************************************
 250  *           TASK_Create
 251  *
 252  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 253  *       to be careful to protect global data structures. We do this
 254  *       by entering the Win16Lock while linking the task into the
 255  *       global task list.
 256  */
 257 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, TEB *teb, LPCSTR cmdline, BYTE len )
 258 {
 259     HTASK16 hTask;
 260     TDB *pTask;
 261     FARPROC16 proc;
 262     HMODULE16 hModule = pModule ? pModule->self : 0;
 263
 264       /* Allocate the task structure */
 265
 266     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 267     if (!hTask) return NULL;
 268     pTask = TASK_GetPtr( hTask );
 269     FarSetOwner16( hTask, hModule );
 270
 271     /* Fill the task structure */
 272
 273     pTask->hSelf = hTask;
 274
 275     if (teb && teb->tibflags & TEBF_WIN32)
 276     {
 277         pTask->flags        |= TDBF_WIN32;
 278         pTask->hInstance     = hModule;
 279         pTask->hPrevInstance = 0;
 280         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 281            in NE_InitProcess */
 282     }
 283
 284     pTask->version       = pModule ? pModule->expected_version : 0x0400;
 285     pTask->hModule       = hModule;
 286     pTask->hParent       = GetCurrentTask();
 287     pTask->magic         = TDB_MAGIC;
 288     pTask->nCmdShow      = cmdShow;
 289     pTask->teb           = teb;
 290     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 291     strcpy( pTask->curdir, "\\" );
 292     WideCharToMultiByte(CP_ACP, 0, DRIVE_GetDosCwd(DRIVE_GetCurrentDrive()), -1,
 293                         pTask->curdir + 1, sizeof(pTask->curdir) - 1, NULL, NULL);
 294     pTask->curdir[sizeof(pTask->curdir) - 1] = 0; /* ensure 0 termination */
 295
 296       /* Create the thunks block */
 297
 298     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 299
 300       /* Copy the module name */
 301
 302     if (hModule)
 303     {
 304         char name[10];
 305         GetModuleName16( hModule, name, sizeof(name) );
 306         strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 307         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 308     }
 309
 310       /* Allocate a selector for the PDB */
 311
 312     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 313                                       hModule, WINE_LDT_FLAGS_DATA );
 314
 315       /* Fill the PDB */
 316
 317     pTask->pdb.int20 = 0x20cd;
 318     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 319     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 320     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 321     pTask->pdb.savedint22 = 0;
 322     pTask->pdb.savedint23 = 0;
 323     pTask->pdb.savedint24 = 0;
 324     pTask->pdb.fileHandlesPtr =
 325         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 326     pTask->pdb.hFileHandles = 0;
 327     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 328     /* FIXME: should we make a copy of the environment? */
 329     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 330     pTask->pdb.nbFiles        = 20;
 331
 332     /* Fill the command line */
 333
 334     if (!cmdline)
 335     {
 336         cmdline = GetCommandLineA();
 337         /* remove the first word (program name) */
 338         if (*cmdline == '"')
 339             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 340         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 341         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 342         len = strlen(cmdline);
 343     }
 344     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 345     pTask->pdb.cmdLine[0] = len;
 346     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 347     /* pTask->pdb.cmdLine[len+1] = 0; */
 348
 349     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 350
 351       /* Allocate a code segment alias for the TDB */
 352
 353     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 354                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 355
 356       /* Default DTA overwrites command line */
 357
 358     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 359
 360     /* Create scheduler event for 16-bit tasks */
 361
 362     if ( !(pTask->flags & TDBF_WIN32) )
 363         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 364
 365     /* Enter task handle into thread */
 366
 367     if (teb) teb->htask16 = hTask;
 368     if (!initial_task) initial_task = hTask;
 369
 370     return pTask;
 371 }
 372
 373
 374 /***********************************************************************
 375  *           TASK_DeleteTask
 376  */
 377 static void TASK_DeleteTask( HTASK16 hTask )
 378 {
 379     TDB *pTask;
 380     HGLOBAL16 hPDB;
 381
 382     if (!(pTask = TASK_GetPtr( hTask ))) return;
 383     hPDB = pTask->hPDB;
 384
 385     pTask->magic = 0xdead; /* invalidate signature */
 386
 387     /* Free the selector aliases */
 388
 389     GLOBAL_FreeBlock( pTask->hCSAlias );
 390     GLOBAL_FreeBlock( pTask->hPDB );
 391
 392     /* Free the task module */
 393
 394     FreeModule16( pTask->hModule );
 395
 396     /* Free the task structure itself */
 397
 398     GlobalFree16( hTask );
 399
 400     /* Free all memory used by this task (including the 32-bit stack, */
 401     /* the environment block and the thunk segments). */
 402
 403     GlobalFreeAll16( hPDB );
 404 }
 405
 406
 407 /***********************************************************************
 408  *           TASK_CreateMainTask
 409  *
 410  * Create a task for the main (32-bit) process.
 411  */
 412 void TASK_CreateMainTask(void)
 413 {
 414     TDB *pTask;
 415     STARTUPINFOA startup_info;
 416     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 417
 418     GetStartupInfoA( &startup_info );
 419     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 420     pTask = TASK_Create( NULL, cmdShow, NtCurrentTeb(), NULL, 0 );
 421     if (!pTask)
 422     {
 423         ERR("could not create task for main process\n");
 424         ExitProcess(1);
 425     }
 426
 427     /* Add the task to the linked list */
 428     /* (no need to get the win16 lock, we are the only thread at this point) */
 429     TASK_LinkTask( pTask->hSelf );
 430 }
 431
 432
 433 /* startup routine for a new 16-bit thread */
 434 static DWORD CALLBACK task_start( TDB *pTask )
 435 {
 436     DWORD ret;
 437
 438     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 439     NtCurrentTeb()->htask16 = pTask->hSelf;
 440
 441     _EnterWin16Lock();
 442     TASK_LinkTask( pTask->hSelf );
 443     pTask->teb = NtCurrentTeb();
 444     ret = NE_StartTask();
 445     _LeaveWin16Lock();
 446     return ret;
 447 }
 448
 449
 450 /***********************************************************************
 451  *           TASK_SpawnTask
 452  *
 453  * Spawn a new 16-bit task.
 454  */
 455 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 456                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 457 {
 458     TDB *pTask;
 459
 460     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 461     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 462     {
 463         TASK_DeleteTask( pTask->hSelf );
 464         return 0;
 465     }
 466     return pTask->hSelf;
 467 }
 468
 469
 470 /***********************************************************************
 471  *           TASK_ExitTask
 472  */
 473 void TASK_ExitTask(void)
 474 {
 475     TDB *pTask;
 476     DWORD lockCount;
 477
 478     /* Enter the Win16Lock to protect global data structures */
 479     _EnterWin16Lock();
 480
 481     pTask = TASK_GetCurrent();
 482     if ( !pTask )
 483     {
 484         _LeaveWin16Lock();
 485         return;
 486     }
 487
 488     TRACE("Killing task %04x\n", pTask->hSelf );
 489
 490     /* Perform USER cleanup */
 491
 492     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 493
 494     /* Remove the task from the list to be sure we never switch back to it */
 495     TASK_UnlinkTask( pTask->hSelf );
 496
 497     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 498     {
 499         TRACE("this is the last task, exiting\n" );
 500         ExitKernel16();
 501     }
 502
 503     if( nTaskCount )
 504     {
 505         TDB* p = TASK_GetPtr( hFirstTask );
 506         while( p )
 507         {
 508             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 509             p = TASK_GetPtr( p->hNext );
 510         }
 511     }
 512
 513     pTask->nEvents = 0;
 514
 515     if ( hLockedTask == pTask->hSelf )
 516         hLockedTask = 0;
 517
 518     TASK_DeleteTask( pTask->hSelf );
 519
 520     /* ... and completely release the Win16Lock, just in case. */
 521     ReleaseThunkLock( &lockCount );
 522 }
 523
 524
 525 /***********************************************************************
 526  *           ExitKernel (KERNEL.2)
 527  *
 528  * Clean-up everything and exit the Wine process.
 529  */
 530 void WINAPI ExitKernel16(void)
 531 {
 532     WriteOutProfiles16();
 533     TerminateProcess( GetCurrentProcess(), 0 );
 534 }
 535
 536
 537 /***********************************************************************
 538  *           InitTask  (KERNEL.91)
 539  *
 540  * Called by the application startup code.
 541  */
 542 void WINAPI InitTask16( CONTEXT86 *context )
 543 {
 544     TDB *pTask;
 545     INSTANCEDATA *pinstance;
 546     SEGPTR ptr;
 547
 548     context->Eax = 0;
 549     if (!(pTask = TASK_GetCurrent())) return;
 550
 551     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 552        as some apps, notably Visual Basic apps, *modify* the heap/stack
 553        size of the instance data segment before calling InitTask() */
 554
 555     /* Initialize the INSTANCEDATA structure */
 556     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 557     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 558     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 559     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 560                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 561
 562     /* Initialize the local heap */
 563     if (LOWORD(context->Ecx))
 564         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 565
 566     /* Initialize implicitly loaded DLLs */
 567     NE_InitializeDLLs( pTask->hModule );
 568     NE_DllProcessAttach( pTask->hModule );
 569
 570     /* Registers on return are:
 571      * ax     1 if OK, 0 on error
 572      * cx     stack limit in bytes
 573      * dx     cmdShow parameter
 574      * si     instance handle of the previous instance
 575      * di     instance handle of the new task
 576      * es:bx  pointer to command line inside PSP
 577      *
 578      * 0 (=%bp) is pushed on the stack
 579      */
 580     ptr = stack16_push( sizeof(WORD) );
 581     *(WORD *)MapSL(ptr) = 0;
 582     context->Esp -= 2;
 583
 584     context->Eax = 1;
 585
 586     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 587     else
 588     {
 589         LPBYTE p = &pTask->pdb.cmdLine[1];
 590         while ((*p == ' ') || (*p == '\t')) p++;
 591         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 592     }
 593     context->Ecx   = pinstance->stacktop;
 594     context->Edx   = pTask->nCmdShow;
 595     context->Esi   = (DWORD)pTask->hPrevInstance;
 596     context->Edi   = (DWORD)pTask->hInstance;
 597     context->SegEs = (WORD)pTask->hPDB;
 598 }
 599
 600
 601 /***********************************************************************
 602  *           WaitEvent  (KERNEL.30)
 603  */
 604 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 605 {
 606     TDB *pTask;
 607
 608     if (!hTask) hTask = GetCurrentTask();
 609     pTask = TASK_GetPtr( hTask );
 610
 611     if (pTask->flags & TDBF_WIN32)
 612     {
 613         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 614         return TRUE;
 615     }
 616
 617     if (pTask->nEvents > 0)
 618     {
 619         pTask->nEvents--;
 620         return FALSE;
 621     }
 622
 623     if (pTask->teb == NtCurrentTeb())
 624     {
 625         DWORD lockCount;
 626
 627         NtResetEvent( pTask->hEvent, NULL );
 628         ReleaseThunkLock( &lockCount );
 629         SYSLEVEL_CheckNotLevel( 1 );
 630         WaitForSingleObject( pTask->hEvent, INFINITE );
 631         RestoreThunkLock( lockCount );
 632         if (pTask->nEvents > 0) pTask->nEvents--;
 633     }
 634     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 635
 636     return TRUE;
 637 }
 638
 639
 640 /***********************************************************************
 641  *           PostEvent  (KERNEL.31)
 642  */
 643 void WINAPI PostEvent16( HTASK16 hTask )
 644 {
 645     TDB *pTask;
 646
 647     if (!hTask) hTask = GetCurrentTask();
 648     if (!(pTask = TASK_GetPtr( hTask ))) return;
 649
 650     if (pTask->flags & TDBF_WIN32)
 651     {
 652         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 653         return;
 654     }
 655
 656     pTask->nEvents++;
 657
 658     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 659 }
 660
 661
 662 /***********************************************************************
 663  *           SetPriority  (KERNEL.32)
 664  */
 665 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 666 {
 667     TDB *pTask;
 668     INT16 newpriority;
 669
 670     if (!hTask) hTask = GetCurrentTask();
 671     if (!(pTask = TASK_GetPtr( hTask ))) return;
 672     newpriority = pTask->priority + delta;
 673     if (newpriority < -32) newpriority = -32;
 674     else if (newpriority > 15) newpriority = 15;
 675
 676     pTask->priority = newpriority + 1;
 677     TASK_UnlinkTask( pTask->hSelf );
 678     TASK_LinkTask( pTask->hSelf );
 679     pTask->priority--;
 680 }
 681
 682
 683 /***********************************************************************
 684  *           LockCurrentTask  (KERNEL.33)
 685  */
 686 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 687 {
 688     if (bLock) hLockedTask = GetCurrentTask();
 689     else hLockedTask = 0;
 690     return hLockedTask;
 691 }
 692
 693
 694 /***********************************************************************
 695  *           IsTaskLocked  (KERNEL.122)
 696  */
 697 HTASK16 WINAPI IsTaskLocked16(void)
 698 {
 699     return hLockedTask;
 700 }
 701
 702
 703 /***********************************************************************
 704  *           OldYield  (KERNEL.117)
 705  */
 706 void WINAPI OldYield16(void)
 707 {
 708    DWORD count;
 709
 710    ReleaseThunkLock(&count);
 711    RestoreThunkLock(count);
 712 }
 713
 714 /***********************************************************************
 715  *           WIN32_OldYield  (KERNEL.447)
 716  */
 717 void WINAPI WIN32_OldYield16(void)
 718 {
 719    DWORD count;
 720
 721    ReleaseThunkLock(&count);
 722    RestoreThunkLock(count);
 723 }
 724
 725 /***********************************************************************
 726  *           DirectedYield  (KERNEL.150)
 727  */
 728 void WINAPI DirectedYield16( HTASK16 hTask )
 729 {
 730     TDB *pCurTask = TASK_GetCurrent();
 731
 732     if (!pCurTask || (pCurTask->flags & TDBF_WIN32)) OldYield16();
 733     else
 734     {
 735         TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 736         pCurTask->hYieldTo = hTask;
 737         OldYield16();
 738         TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 739     }
 740 }
 741
 742 /***********************************************************************
 743  *           Yield  (KERNEL.29)
 744  */
 745 void WINAPI Yield16(void)
 746 {
 747     TDB *pCurTask = TASK_GetCurrent();
 748
 749     if (pCurTask) pCurTask->hYieldTo = 0;
 750     if (pCurTask && pCurTask->hQueue)
 751     {
 752         HMODULE mod = GetModuleHandleA( "user32.dll" );
 753         if (mod)
 754         {
 755             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 756             if (proc)
 757             {
 758                 proc();
 759                 return;
 760             }
 761         }
 762     }
 763     OldYield16();
 764 }
 765
 766 /***********************************************************************
 767  *           KERNEL_490  (KERNEL.490)
 768  */
 769 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 770 {
 771     if ( !someTask ) return 0;
 772
 773     FIXME("(%04x): stub\n", someTask );
 774     return 0;
 775 }
 776
 777 /***********************************************************************
 778  *           MakeProcInstance  (KERNEL.51)
 779  */
 780 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 781 {
 782     BYTE *thunk,*lfunc;
 783     SEGPTR thunkaddr;
 784     WORD hInstanceSelector;
 785
 786     hInstanceSelector = GlobalHandleToSel16(hInstance);
 787
 788     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 789
 790     if (!HIWORD(func)) {
 791       /* Win95 actually protects via SEH, but this is better for debugging */
 792       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 793       return (FARPROC16)0;
 794     }
 795
 796     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 797       && (hInstance != 0)
 798       && (hInstance != 0xffff) )
 799     {
 800         /* calling MPI with a foreign DSEG is invalid ! */
 801         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 802                    hInstance,CURRENT_DS);
 803     }
 804
 805     /* Always use the DSEG that MPI was entered with.
 806      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 807      * as CURRENT_DS provides the DSEG value we need.
 808      * ("calling" DS, *not* "task" DS !) */
 809     hInstanceSelector = CURRENT_DS;
 810     hInstance = GlobalHandle16(hInstanceSelector);
 811
 812     /* no thunking for DLLs */
 813     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 814         return func;
 815
 816     thunkaddr = TASK_AllocThunk();
 817     if (!thunkaddr) return (FARPROC16)0;
 818     thunk = MapSL( thunkaddr );
 819     lfunc = MapSL( (SEGPTR)func );
 820
 821     TRACE("(%08lx,%04x): got thunk %08lx\n",
 822           (DWORD)func, hInstance, (DWORD)thunkaddr );
 823     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 824         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 825     ) {
 826         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 827     }
 828
 829     *thunk++ = 0xb8;    /* movw instance, %ax */
 830     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 831     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 832     *thunk++ = 0xea;    /* ljmp func */
 833     *(DWORD *)thunk = (DWORD)func;
 834     return (FARPROC16)thunkaddr;
 835     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 836 }
 837
 838
 839 /***********************************************************************
 840  *           FreeProcInstance  (KERNEL.52)
 841  */
 842 void WINAPI FreeProcInstance16( FARPROC16 func )
 843 {
 844     TRACE("(%08lx)\n", (DWORD)func );
 845     TASK_FreeThunk( (SEGPTR)func );
 846 }
 847
 848 /**********************************************************************
 849  *          TASK_GetCodeSegment
 850  *
 851  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 852  * and logical segment number of a given code segment.
 853  *
 854  * 'proc' either *is* already a pair of module handle and segment number,
 855  * in which case there's nothing to do.  Otherwise, it is a pointer to
 856  * a function, and we need to retrieve the code segment.  If the pointer
 857  * happens to point to a thunk, we'll retrieve info about the code segment
 858  * where the function pointed to by the thunk resides, not the thunk itself.
 859  *
 860  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 861  *        the function the snoop code will return to ...
 862  *
 863  */
 864 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 865                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 866 {
 867     NE_MODULE *pModule = NULL;
 868     SEGTABLEENTRY *pSeg = NULL;
 869     int segNr=0;
 870
 871     /* Try pair of module handle / segment number */
 872     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 873     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 874     {
 875         segNr = LOWORD( proc );
 876         if ( segNr && segNr <= pModule->seg_count )
 877             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 878     }
 879
 880     /* Try thunk or function */
 881     else
 882     {
 883         BYTE *thunk = MapSL( (SEGPTR)proc );
 884         WORD selector;
 885
 886         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 887             selector = thunk[6] + (thunk[7] << 8);
 888         else
 889             selector = HIWORD( proc );
 890
 891         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 892         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 893
 894         if ( pModule )
 895             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 896                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 897                     break;
 898
 899         if ( pModule && segNr > pModule->seg_count )
 900             pSeg = NULL;
 901     }
 902
 903     /* Abort if segment not found */
 904
 905     if ( !pModule || !pSeg )
 906         return FALSE;
 907
 908     /* Return segment data */
 909
 910     if ( ppModule ) *ppModule = pModule;
 911     if ( ppSeg    ) *ppSeg    = pSeg;
 912     if ( pSegNr   ) *pSegNr   = segNr;
 913
 914     return TRUE;
 915 }
 916
 917 /**********************************************************************
 918  *          GetCodeHandle    (KERNEL.93)
 919  */
 920 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 921 {
 922     SEGTABLEENTRY *pSeg;
 923
 924     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 925         return (HANDLE16)0;
 926
 927     return pSeg->hSeg;
 928 }
 929
 930 /**********************************************************************
 931  *          GetCodeInfo    (KERNEL.104)
 932  */
 933 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 934 {
 935     NE_MODULE *pModule;
 936     SEGTABLEENTRY *pSeg;
 937     int segNr;
 938
 939     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 940         return FALSE;
 941
 942     /* Fill in segment information */
 943
 944     segInfo->offSegment = pSeg->filepos;
 945     segInfo->cbSegment  = pSeg->size;
 946     segInfo->flags      = pSeg->flags;
 947     segInfo->cbAlloc    = pSeg->minsize;
 948     segInfo->h          = pSeg->hSeg;
 949     segInfo->alignShift = pModule->alignment;
 950
 951     if ( segNr == pModule->dgroup )
 952         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 953
 954     /* Return module handle in %es */
 955
 956     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 957
 958     return TRUE;
 959 }
 960
 961
 962 /**********************************************************************
 963  *          DefineHandleTable    (KERNEL.94)
 964  */
 965 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 966 {
 967     FIXME("(%04x): stub ?\n", wOffset);
 968     return TRUE;
 969 }
 970
 971
 972 /***********************************************************************
 973  *           SetTaskQueue  (KERNEL.34)
 974  */
 975 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 976 {
 977     HQUEUE16 hPrev;
 978     TDB *pTask;
 979
 980     if (!hTask) hTask = GetCurrentTask();
 981     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 982
 983     hPrev = pTask->hQueue;
 984     pTask->hQueue = hQueue;
 985
 986     return hPrev;
 987 }
 988
 989
 990 /***********************************************************************
 991  *           GetTaskQueue  (KERNEL.35)
 992  */
 993 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
 994 {
 995     TDB *pTask;
 996
 997     if (!hTask) hTask = GetCurrentTask();
 998     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 999     return pTask->hQueue;
1000 }
1001
1002 /***********************************************************************
1003  *           SetThreadQueue  (KERNEL.463)
1004  */
1005 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1006 {
1007     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1008     HQUEUE16 oldQueue = teb? teb->queue : 0;
1009
1010     if ( teb )
1011     {
1012         teb->queue = hQueue;
1013
1014         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1015             SetTaskQueue16( teb->htask16, hQueue );
1016     }
1017
1018     return oldQueue;
1019 }
1020
1021 /***********************************************************************
1022  *           GetThreadQueue  (KERNEL.464)
1023  */
1024 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1025 {
1026     TEB *teb = NULL;
1027     if ( !thread )
1028         teb = NtCurrentTeb();
1029     else if ( HIWORD(thread) )
1030         teb = THREAD_IdToTEB( thread );
1031     else if ( IsTask16( (HTASK16)thread ) )
1032         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1033
1034     return (HQUEUE16)(teb? teb->queue : 0);
1035 }
1036
1037 /***********************************************************************
1038  *           SetFastQueue  (KERNEL.624)
1039  */
1040 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1041 {
1042     TEB *teb = NULL;
1043     if ( !thread )
1044         teb = NtCurrentTeb();
1045     else if ( HIWORD(thread) )
1046         teb = THREAD_IdToTEB( thread );
1047     else if ( IsTask16( (HTASK16)thread ) )
1048         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1049
1050     if ( teb ) teb->queue = hQueue;
1051 }
1052
1053 /***********************************************************************
1054  *           GetFastQueue  (KERNEL.625)
1055  */
1056 HQUEUE16 WINAPI GetFastQueue16( void )
1057 {
1058     HQUEUE16 ret = NtCurrentTeb()->queue;
1059
1060     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1061     return ret;
1062 }
1063
1064 /***********************************************************************
1065  *           SwitchStackTo   (KERNEL.108)
1066  */
1067 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1068 {
1069     TDB *pTask;
1070     STACK16FRAME *oldFrame, *newFrame;
1071     INSTANCEDATA *pData;
1072     UINT16 copySize;
1073
1074     if (!(pTask = TASK_GetCurrent())) return;
1075     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1076     TRACE("old=%04x:%04x new=%04x:%04x\n",
1077           SELECTOROF( pTask->teb->cur_stack ),
1078           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1079
1080     /* Save the old stack */
1081
1082     oldFrame = THREAD_STACK16( pTask->teb );
1083     /* pop frame + args and push bp */
1084     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1085                            + 2 * sizeof(WORD);
1086     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1087     pData->stacktop    = top;
1088     pData->stackmin    = ptr;
1089     pData->stackbottom = ptr;
1090
1091     /* Switch to the new stack */
1092
1093     /* Note: we need to take the 3 arguments into account; otherwise,
1094      * the stack will underflow upon return from this function.
1095      */
1096     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1097     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1098     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1099     newFrame = THREAD_STACK16( pTask->teb );
1100
1101     /* Copy the stack frame and the local variables to the new stack */
1102
1103     memmove( newFrame, oldFrame, copySize );
1104     newFrame->bp = ptr;
1105     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1106 }
1107
1108
1109 /***********************************************************************
1110  *           SwitchStackBack   (KERNEL.109)
1111  */
1112 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1113 {
1114     STACK16FRAME *oldFrame, *newFrame;
1115     INSTANCEDATA *pData;
1116
1117     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1118         return;
1119     if (!pData->old_ss_sp)
1120     {
1121         WARN("No previous SwitchStackTo\n" );
1122         return;
1123     }
1124     TRACE("restoring stack %04x:%04x\n",
1125           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1126
1127     oldFrame = CURRENT_STACK16;
1128
1129     /* Pop bp from the previous stack */
1130
1131     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1132     pData->old_ss_sp += sizeof(WORD);
1133
1134     /* Switch back to the old stack */
1135
1136     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1137     context->SegSs = SELECTOROF(pData->old_ss_sp);
1138     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1139     pData->old_ss_sp = 0;
1140
1141     /* Build a stack frame for the return */
1142
1143     newFrame = CURRENT_STACK16;
1144     newFrame->frame32     = oldFrame->frame32;
1145     newFrame->module_cs   = oldFrame->module_cs;
1146     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1147     newFrame->entry_ip    = oldFrame->entry_ip;
1148 }
1149
1150
1151 /***********************************************************************
1152  *           GetTaskQueueDS  (KERNEL.118)
1153  */
1154 void WINAPI GetTaskQueueDS16(void)
1155 {
1156     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1157 }
1158
1159
1160 /***********************************************************************
1161  *           GetTaskQueueES  (KERNEL.119)
1162  */
1163 void WINAPI GetTaskQueueES16(void)
1164 {
1165     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1166 }
1167
1168
1169 /***********************************************************************
1170  *           GetCurrentTask   (KERNEL32.@)
1171  */
1172 HTASK16 WINAPI GetCurrentTask(void)
1173 {
1174     return NtCurrentTeb()->htask16;
1175 }
1176
1177 /***********************************************************************
1178  *           GetCurrentTask   (KERNEL.36)
1179  */
1180 DWORD WINAPI WIN16_GetCurrentTask(void)
1181 {
1182     /* This is the version used by relay code; the first task is */
1183     /* returned in the high word of the result */
1184     return MAKELONG( GetCurrentTask(), hFirstTask );
1185 }
1186
1187
1188 /***********************************************************************
1189  *           GetCurrentPDB   (KERNEL.37)
1190  *
1191  * UNDOC: returns PSP of KERNEL in high word
1192  */
1193 DWORD WINAPI GetCurrentPDB16(void)
1194 {
1195     TDB *pTask;
1196
1197     if (!(pTask = TASK_GetCurrent())) return 0;
1198     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1199 }
1200
1201
1202 /***********************************************************************
1203  *           GetCurPID   (KERNEL.157)
1204  */
1205 DWORD WINAPI GetCurPID16( DWORD unused )
1206 {
1207     return 0;
1208 }
1209
1210
1211 /***********************************************************************
1212  *           GetInstanceData   (KERNEL.54)
1213  */
1214 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1215 {
1216     char *ptr = (char *)GlobalLock16( instance );
1217     if (!ptr || !len) return 0;
1218     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1219     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1220     return len;
1221 }
1222
1223
1224 /***********************************************************************
1225  *           GetExeVersion   (KERNEL.105)
1226  */
1227 WORD WINAPI GetExeVersion16(void)
1228 {
1229     TDB *pTask;
1230
1231     if (!(pTask = TASK_GetCurrent())) return 0;
1232     return pTask->version;
1233 }
1234
1235
1236 /***********************************************************************
1237  *           SetErrorMode   (KERNEL.107)
1238  */
1239 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1240 {
1241     TDB *pTask;
1242     if (!(pTask = TASK_GetCurrent())) return 0;
1243     pTask->error_mode = mode;
1244     return SetErrorMode( mode );
1245 }
1246
1247
1248 /***********************************************************************
1249  *           GetNumTasks   (KERNEL.152)
1250  */
1251 UINT16 WINAPI GetNumTasks16(void)
1252 {
1253     return nTaskCount;
1254 }
1255
1256
1257 /***********************************************************************
1258  *           GetTaskDS   (KERNEL.155)
1259  *
1260  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1261  * I don't think we need to bother with this.
1262  */
1263 HINSTANCE16 WINAPI GetTaskDS16(void)
1264 {
1265     TDB *pTask;
1266
1267     if (!(pTask = TASK_GetCurrent())) return 0;
1268     return GlobalHandleToSel16(pTask->hInstance);
1269 }
1270
1271 /***********************************************************************
1272  *           GetDummyModuleHandleDS   (KERNEL.602)
1273  */
1274 WORD WINAPI GetDummyModuleHandleDS16(void)
1275 {
1276     TDB *pTask;
1277     WORD selector;
1278
1279     if (!(pTask = TASK_GetCurrent())) return 0;
1280     if (!(pTask->flags & TDBF_WIN32)) return 0;
1281     selector = GlobalHandleToSel16( pTask->hModule );
1282     CURRENT_DS = selector;
1283     return selector;
1284 }
1285
1286 /***********************************************************************
1287  *           IsTask   (KERNEL.320)
1288  */
1289 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1290 {
1291     TDB *pTask;
1292
1293     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1294     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1295     return (pTask->magic == TDB_MAGIC);
1296 }
1297
1298
1299 /***********************************************************************
1300  *           IsWinOldApTask   (KERNEL.158)
1301  */
1302 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1303 {
1304     /* should return bit 0 of byte 0x48 in PSP */
1305     return FALSE;
1306 }
1307
1308 /***********************************************************************
1309  *           SetTaskSignalProc   (KERNEL.38)
1310  */
1311 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1312 {
1313     TDB *pTask;
1314     FARPROC16 oldProc;
1315
1316     if (!hTask) hTask = GetCurrentTask();
1317     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1318     oldProc = pTask->userhandler;
1319     pTask->userhandler = proc;
1320     return oldProc;
1321 }
1322
1323 /***********************************************************************
1324  *           TASK_CallTaskSignalProc
1325  */
1326 /* ### start build ### */
1327 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1328 /* ### stop build ### */
1329 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1330 {
1331     TDB *pTask = TASK_GetCurrent();
1332     if ( !pTask || !pTask->userhandler ) return;
1333
1334     TASK_CallTo16_word_wwwww( pTask->userhandler,
1335                               hTaskOrModule, uCode, 0,
1336                               pTask->hInstance, pTask->hQueue );
1337 }
1338
1339 /***********************************************************************
1340  *           SetSigHandler   (KERNEL.140)
1341  */
1342 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1343                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1344 {
1345     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1346           newhandler,oldhandler,oldmode,newmode,flag );
1347
1348     if (flag != 1) return 0;
1349     if (!newmode) newhandler = NULL;  /* Default handler */
1350     if (newmode != 4)
1351     {
1352         TDB *pTask;
1353
1354         if (!(pTask = TASK_GetCurrent())) return 0;
1355         if (oldmode) *oldmode = pTask->signal_flags;
1356         pTask->signal_flags = newmode;
1357         if (oldhandler) *oldhandler = pTask->sighandler;
1358         pTask->sighandler = newhandler;
1359     }
1360     return 0;
1361 }
1362
1363
1364 /***********************************************************************
1365  *           GlobalNotify   (KERNEL.154)
1366  *
1367  * Note that GlobalNotify does _not_ return the old NotifyProc
1368  * -- contrary to LocalNotify !!
1369  */
1370 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1371 {
1372     TDB *pTask;
1373
1374     if (!(pTask = TASK_GetCurrent())) return;
1375     pTask->discardhandler = proc;
1376 }
1377
1378
1379 /***********************************************************************
1380  *           GetExePtrHelper
1381  */
1382 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1383 {
1384     char *ptr;
1385     HANDLE16 owner;
1386
1387       /* Check for module handle */
1388
1389     if (!(ptr = GlobalLock16( handle ))) return 0;
1390     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1391
1392       /* Search for this handle inside all tasks */
1393
1394     *hTask = hFirstTask;
1395     while (*hTask)
1396     {
1397         TDB *pTask = TASK_GetPtr( *hTask );
1398         if ((*hTask == handle) ||
1399             (pTask->hInstance == handle) ||
1400             (pTask->hQueue == handle) ||
1401             (pTask->hPDB == handle)) return pTask->hModule;
1402         *hTask = pTask->hNext;
1403     }
1404
1405       /* Check the owner for module handle */
1406
1407     owner = FarGetOwner16( handle );
1408     if (!(ptr = GlobalLock16( owner ))) return 0;
1409     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1410
1411       /* Search for the owner inside all tasks */
1412
1413     *hTask = hFirstTask;
1414     while (*hTask)
1415     {
1416         TDB *pTask = TASK_GetPtr( *hTask );
1417         if ((*hTask == owner) ||
1418             (pTask->hInstance == owner) ||
1419             (pTask->hQueue == owner) ||
1420             (pTask->hPDB == owner)) return pTask->hModule;
1421         *hTask = pTask->hNext;
1422     }
1423
1424     return 0;
1425 }
1426
1427 /***********************************************************************
1428  *           GetExePtr   (KERNEL.133)
1429  */
1430 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1431 {
1432     HTASK16 hTask = 0;
1433     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1434     STACK16FRAME *frame = CURRENT_STACK16;
1435     frame->ecx = hModule;
1436     if (hTask) frame->es = hTask;
1437     return hModule;
1438 }
1439
1440
1441 /***********************************************************************
1442  *           K228   (KERNEL.228)
1443  */
1444 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1445 {
1446     HTASK16 hTask = 0;
1447     return GetExePtrHelper( handle, &hTask );
1448 }
1449
1450
1451 /***********************************************************************
1452  *           TaskFirst   (TOOLHELP.63)
1453  */
1454 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1455 {
1456     lpte->hNext = hFirstTask;
1457     return TaskNext16( lpte );
1458 }
1459
1460
1461 /***********************************************************************
1462  *           TaskNext   (TOOLHELP.64)
1463  */
1464 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1465 {
1466     TDB *pTask;
1467     INSTANCEDATA *pInstData;
1468
1469     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1470     if (!lpte->hNext) return FALSE;
1471
1472     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1473     while (1) {
1474         pTask = TASK_GetPtr( lpte->hNext );
1475         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1476         if (pTask->hInstance)
1477             break;
1478         lpte->hNext = pTask->hNext;
1479     }
1480     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1481     lpte->hTask         = lpte->hNext;
1482     lpte->hTaskParent   = pTask->hParent;
1483     lpte->hInst         = pTask->hInstance;
1484     lpte->hModule       = pTask->hModule;
1485     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1486     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1487     lpte->wStackTop     = pInstData->stacktop;
1488     lpte->wStackMinimum = pInstData->stackmin;
1489     lpte->wStackBottom  = pInstData->stackbottom;
1490     lpte->wcEvents      = pTask->nEvents;
1491     lpte->hQueue        = pTask->hQueue;
1492     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1493     lpte->wPSPOffset    = 0x100;  /*??*/
1494     lpte->hNext         = pTask->hNext;
1495     return TRUE;
1496 }
1497
1498
1499 /***********************************************************************
1500  *           TaskFindHandle   (TOOLHELP.65)
1501  */
1502 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1503 {
1504     lpte->hNext = hTask;
1505     return TaskNext16( lpte );
1506 }
1507
1508
1509 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1510
1511 /**************************************************************************
1512  *           FatalAppExit   (KERNEL.137)
1513  */
1514 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1515 {
1516     TDB *pTask = TASK_GetCurrent();
1517
1518     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1519     {
1520         HMODULE mod = GetModuleHandleA( "user32.dll" );
1521         if (mod)
1522         {
1523             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1524             if (pMessageBoxA)
1525             {
1526                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1527                 goto done;
1528             }
1529         }
1530         ERR( "%s\n", debugstr_a(str) );
1531     }
1532  done:
1533     ExitThread(0xff);
1534 }
1535
1536
1537 /***********************************************************************
1538  *           TerminateApp   (TOOLHELP.77)
1539  *
1540  * See "Undocumented Windows".
1541  */
1542 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1543 {
1544     if (hTask && hTask != GetCurrentTask())
1545     {
1546         FIXME("cannot terminate task %x\n", hTask);
1547         return;
1548     }
1549
1550     if (wFlags & NO_UAE_BOX)
1551     {
1552         UINT16 old_mode;
1553         old_mode = SetErrorMode16(0);
1554         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1555     }
1556     FatalAppExit16( 0, NULL );
1557
1558     /* hmm, we're still alive ?? */
1559
1560     /* check undocumented flag */
1561     if (!(wFlags & 0x8000))
1562         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1563
1564     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1565        but let's just call ExitThread */
1566     ExitThread(0xff);
1567 }
1568
1569
1570 /***********************************************************************
1571  *           GetAppCompatFlags   (KERNEL.354)
1572  */
1573 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1574 {
1575     TDB *pTask;
1576
1577     if (!hTask) hTask = GetCurrentTask();
1578     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1579     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1580     return pTask->compat_flags;
1581 }