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     char name[10];
 262     FARPROC16 proc;
 263     HMODULE16 hModule = pModule ? pModule->self : 0;
 264
 265       /* Allocate the task structure */
 266
 267     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 268     if (!hTask) return NULL;
 269     pTask = TASK_GetPtr( hTask );
 270     FarSetOwner16( hTask, hModule );
 271
 272     /* Fill the task structure */
 273
 274     pTask->hSelf = hTask;
 275
 276     if (teb && teb->tibflags & TEBF_WIN32)
 277     {
 278         pTask->flags        |= TDBF_WIN32;
 279         pTask->hInstance     = hModule;
 280         pTask->hPrevInstance = 0;
 281         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 282            in NE_InitProcess */
 283     }
 284
 285     pTask->version       = pModule ? pModule->expected_version : 0x0400;
 286     pTask->hModule       = hModule;
 287     pTask->hParent       = GetCurrentTask();
 288     pTask->magic         = TDB_MAGIC;
 289     pTask->nCmdShow      = cmdShow;
 290     pTask->teb           = teb;
 291     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 292     strcpy( pTask->curdir, "\\" );
 293     WideCharToMultiByte(CP_ACP, 0, DRIVE_GetDosCwd(DRIVE_GetCurrentDrive()), -1,
 294                         pTask->curdir + 1, sizeof(pTask->curdir) - 1, NULL, NULL);
 295     pTask->curdir[sizeof(pTask->curdir) - 1] = 0; /* ensure 0 termination */
 296
 297       /* Create the thunks block */
 298
 299     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 300
 301       /* Copy the module name */
 302
 303     if (hModule)
 304     {
 305         GetModuleName16( hModule, name, sizeof(name) );
 306         strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 307     }
 308
 309       /* Allocate a selector for the PDB */
 310
 311     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 312                                       hModule, WINE_LDT_FLAGS_DATA );
 313
 314       /* Fill the PDB */
 315
 316     pTask->pdb.int20 = 0x20cd;
 317     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 318     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 319     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 320     pTask->pdb.savedint22 = 0;
 321     pTask->pdb.savedint23 = 0;
 322     pTask->pdb.savedint24 = 0;
 323     pTask->pdb.fileHandlesPtr =
 324         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 325     pTask->pdb.hFileHandles = 0;
 326     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 327     /* FIXME: should we make a copy of the environment? */
 328     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 329     pTask->pdb.nbFiles        = 20;
 330
 331     /* Fill the command line */
 332
 333     if (!cmdline)
 334     {
 335         cmdline = GetCommandLineA();
 336         /* remove the first word (program name) */
 337         if (*cmdline == '"')
 338             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 339         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 340         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 341         len = strlen(cmdline);
 342     }
 343     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 344     pTask->pdb.cmdLine[0] = len;
 345     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 346     /* pTask->pdb.cmdLine[len+1] = 0; */
 347
 348     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 349
 350       /* Get the compatibility flags */
 351
 352     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 353
 354       /* Allocate a code segment alias for the TDB */
 355
 356     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 357                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 358
 359       /* Default DTA overwrites command line */
 360
 361     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 362
 363     /* Create scheduler event for 16-bit tasks */
 364
 365     if ( !(pTask->flags & TDBF_WIN32) )
 366         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 367
 368     /* Enter task handle into thread */
 369
 370     if (teb) teb->htask16 = hTask;
 371     if (!initial_task) initial_task = hTask;
 372
 373     return pTask;
 374 }
 375
 376
 377 /***********************************************************************
 378  *           TASK_DeleteTask
 379  */
 380 static void TASK_DeleteTask( HTASK16 hTask )
 381 {
 382     TDB *pTask;
 383     HGLOBAL16 hPDB;
 384
 385     if (!(pTask = TASK_GetPtr( hTask ))) return;
 386     hPDB = pTask->hPDB;
 387
 388     pTask->magic = 0xdead; /* invalidate signature */
 389
 390     /* Free the selector aliases */
 391
 392     GLOBAL_FreeBlock( pTask->hCSAlias );
 393     GLOBAL_FreeBlock( pTask->hPDB );
 394
 395     /* Free the task module */
 396
 397     FreeModule16( pTask->hModule );
 398
 399     /* Free the task structure itself */
 400
 401     GlobalFree16( hTask );
 402
 403     /* Free all memory used by this task (including the 32-bit stack, */
 404     /* the environment block and the thunk segments). */
 405
 406     GlobalFreeAll16( hPDB );
 407 }
 408
 409
 410 /***********************************************************************
 411  *           TASK_CreateMainTask
 412  *
 413  * Create a task for the main (32-bit) process.
 414  */
 415 void TASK_CreateMainTask(void)
 416 {
 417     TDB *pTask;
 418     STARTUPINFOA startup_info;
 419     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 420
 421     GetStartupInfoA( &startup_info );
 422     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 423     pTask = TASK_Create( NULL, cmdShow, NtCurrentTeb(), NULL, 0 );
 424     if (!pTask)
 425     {
 426         ERR("could not create task for main process\n");
 427         ExitProcess(1);
 428     }
 429
 430     /* Add the task to the linked list */
 431     /* (no need to get the win16 lock, we are the only thread at this point) */
 432     TASK_LinkTask( pTask->hSelf );
 433 }
 434
 435
 436 /* startup routine for a new 16-bit thread */
 437 static DWORD CALLBACK task_start( TDB *pTask )
 438 {
 439     DWORD ret;
 440
 441     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 442     NtCurrentTeb()->htask16 = pTask->hSelf;
 443
 444     _EnterWin16Lock();
 445     TASK_LinkTask( pTask->hSelf );
 446     pTask->teb = NtCurrentTeb();
 447     ret = NE_StartTask();
 448     _LeaveWin16Lock();
 449     return ret;
 450 }
 451
 452
 453 /***********************************************************************
 454  *           TASK_SpawnTask
 455  *
 456  * Spawn a new 16-bit task.
 457  */
 458 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 459                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 460 {
 461     TDB *pTask;
 462
 463     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 464     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 465     {
 466         TASK_DeleteTask( pTask->hSelf );
 467         return 0;
 468     }
 469     return pTask->hSelf;
 470 }
 471
 472
 473 /***********************************************************************
 474  *           TASK_ExitTask
 475  */
 476 void TASK_ExitTask(void)
 477 {
 478     TDB *pTask;
 479     DWORD lockCount;
 480
 481     /* Enter the Win16Lock to protect global data structures */
 482     _EnterWin16Lock();
 483
 484     pTask = TASK_GetCurrent();
 485     if ( !pTask )
 486     {
 487         _LeaveWin16Lock();
 488         return;
 489     }
 490
 491     TRACE("Killing task %04x\n", pTask->hSelf );
 492
 493     /* Perform USER cleanup */
 494
 495     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 496
 497     /* Remove the task from the list to be sure we never switch back to it */
 498     TASK_UnlinkTask( pTask->hSelf );
 499
 500     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 501     {
 502         TRACE("this is the last task, exiting\n" );
 503         ExitKernel16();
 504     }
 505
 506     if( nTaskCount )
 507     {
 508         TDB* p = TASK_GetPtr( hFirstTask );
 509         while( p )
 510         {
 511             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 512             p = TASK_GetPtr( p->hNext );
 513         }
 514     }
 515
 516     pTask->nEvents = 0;
 517
 518     if ( hLockedTask == pTask->hSelf )
 519         hLockedTask = 0;
 520
 521     TASK_DeleteTask( pTask->hSelf );
 522
 523     /* ... and completely release the Win16Lock, just in case. */
 524     ReleaseThunkLock( &lockCount );
 525 }
 526
 527
 528 /***********************************************************************
 529  *           ExitKernel (KERNEL.2)
 530  *
 531  * Clean-up everything and exit the Wine process.
 532  */
 533 void WINAPI ExitKernel16(void)
 534 {
 535     WriteOutProfiles16();
 536     TerminateProcess( GetCurrentProcess(), 0 );
 537 }
 538
 539
 540 /***********************************************************************
 541  *           InitTask  (KERNEL.91)
 542  *
 543  * Called by the application startup code.
 544  */
 545 void WINAPI InitTask16( CONTEXT86 *context )
 546 {
 547     TDB *pTask;
 548     INSTANCEDATA *pinstance;
 549     SEGPTR ptr;
 550
 551     context->Eax = 0;
 552     if (!(pTask = TASK_GetCurrent())) return;
 553
 554     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 555        as some apps, notably Visual Basic apps, *modify* the heap/stack
 556        size of the instance data segment before calling InitTask() */
 557
 558     /* Initialize the INSTANCEDATA structure */
 559     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 560     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 561     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 562     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 563                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 564
 565     /* Initialize the local heap */
 566     if (LOWORD(context->Ecx))
 567         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 568
 569     /* Initialize implicitly loaded DLLs */
 570     NE_InitializeDLLs( pTask->hModule );
 571     NE_DllProcessAttach( pTask->hModule );
 572
 573     /* Registers on return are:
 574      * ax     1 if OK, 0 on error
 575      * cx     stack limit in bytes
 576      * dx     cmdShow parameter
 577      * si     instance handle of the previous instance
 578      * di     instance handle of the new task
 579      * es:bx  pointer to command line inside PSP
 580      *
 581      * 0 (=%bp) is pushed on the stack
 582      */
 583     ptr = stack16_push( sizeof(WORD) );
 584     *(WORD *)MapSL(ptr) = 0;
 585     context->Esp -= 2;
 586
 587     context->Eax = 1;
 588
 589     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 590     else
 591     {
 592         LPBYTE p = &pTask->pdb.cmdLine[1];
 593         while ((*p == ' ') || (*p == '\t')) p++;
 594         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 595     }
 596     context->Ecx   = pinstance->stacktop;
 597     context->Edx   = pTask->nCmdShow;
 598     context->Esi   = (DWORD)pTask->hPrevInstance;
 599     context->Edi   = (DWORD)pTask->hInstance;
 600     context->SegEs = (WORD)pTask->hPDB;
 601 }
 602
 603
 604 /***********************************************************************
 605  *           WaitEvent  (KERNEL.30)
 606  */
 607 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 608 {
 609     TDB *pTask;
 610
 611     if (!hTask) hTask = GetCurrentTask();
 612     pTask = TASK_GetPtr( hTask );
 613
 614     if (pTask->flags & TDBF_WIN32)
 615     {
 616         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 617         return TRUE;
 618     }
 619
 620     if (pTask->nEvents > 0)
 621     {
 622         pTask->nEvents--;
 623         return FALSE;
 624     }
 625
 626     if (pTask->teb == NtCurrentTeb())
 627     {
 628         DWORD lockCount;
 629
 630         NtResetEvent( pTask->hEvent, NULL );
 631         ReleaseThunkLock( &lockCount );
 632         SYSLEVEL_CheckNotLevel( 1 );
 633         WaitForSingleObject( pTask->hEvent, INFINITE );
 634         RestoreThunkLock( lockCount );
 635         if (pTask->nEvents > 0) pTask->nEvents--;
 636     }
 637     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 638
 639     return TRUE;
 640 }
 641
 642
 643 /***********************************************************************
 644  *           PostEvent  (KERNEL.31)
 645  */
 646 void WINAPI PostEvent16( HTASK16 hTask )
 647 {
 648     TDB *pTask;
 649
 650     if (!hTask) hTask = GetCurrentTask();
 651     if (!(pTask = TASK_GetPtr( hTask ))) return;
 652
 653     if (pTask->flags & TDBF_WIN32)
 654     {
 655         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 656         return;
 657     }
 658
 659     pTask->nEvents++;
 660
 661     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 662 }
 663
 664
 665 /***********************************************************************
 666  *           SetPriority  (KERNEL.32)
 667  */
 668 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 669 {
 670     TDB *pTask;
 671     INT16 newpriority;
 672
 673     if (!hTask) hTask = GetCurrentTask();
 674     if (!(pTask = TASK_GetPtr( hTask ))) return;
 675     newpriority = pTask->priority + delta;
 676     if (newpriority < -32) newpriority = -32;
 677     else if (newpriority > 15) newpriority = 15;
 678
 679     pTask->priority = newpriority + 1;
 680     TASK_UnlinkTask( pTask->hSelf );
 681     TASK_LinkTask( pTask->hSelf );
 682     pTask->priority--;
 683 }
 684
 685
 686 /***********************************************************************
 687  *           LockCurrentTask  (KERNEL.33)
 688  */
 689 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 690 {
 691     if (bLock) hLockedTask = GetCurrentTask();
 692     else hLockedTask = 0;
 693     return hLockedTask;
 694 }
 695
 696
 697 /***********************************************************************
 698  *           IsTaskLocked  (KERNEL.122)
 699  */
 700 HTASK16 WINAPI IsTaskLocked16(void)
 701 {
 702     return hLockedTask;
 703 }
 704
 705
 706 /***********************************************************************
 707  *           OldYield  (KERNEL.117)
 708  */
 709 void WINAPI OldYield16(void)
 710 {
 711    DWORD count;
 712
 713    ReleaseThunkLock(&count);
 714    RestoreThunkLock(count);
 715 }
 716
 717 /***********************************************************************
 718  *           WIN32_OldYield  (KERNEL.447)
 719  */
 720 void WINAPI WIN32_OldYield16(void)
 721 {
 722    DWORD count;
 723
 724    ReleaseThunkLock(&count);
 725    RestoreThunkLock(count);
 726 }
 727
 728 /***********************************************************************
 729  *           DirectedYield  (KERNEL.150)
 730  */
 731 void WINAPI DirectedYield16( HTASK16 hTask )
 732 {
 733     TDB *pCurTask = TASK_GetCurrent();
 734
 735     if (!pCurTask || (pCurTask->flags & TDBF_WIN32)) OldYield16();
 736     else
 737     {
 738         TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 739         pCurTask->hYieldTo = hTask;
 740         OldYield16();
 741         TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 742     }
 743 }
 744
 745 /***********************************************************************
 746  *           Yield  (KERNEL.29)
 747  */
 748 void WINAPI Yield16(void)
 749 {
 750     TDB *pCurTask = TASK_GetCurrent();
 751
 752     if (pCurTask) pCurTask->hYieldTo = 0;
 753     if (pCurTask && pCurTask->hQueue)
 754     {
 755         HMODULE mod = GetModuleHandleA( "user32.dll" );
 756         if (mod)
 757         {
 758             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 759             if (proc)
 760             {
 761                 proc();
 762                 return;
 763             }
 764         }
 765     }
 766     OldYield16();
 767 }
 768
 769 /***********************************************************************
 770  *           KERNEL_490  (KERNEL.490)
 771  */
 772 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 773 {
 774     if ( !someTask ) return 0;
 775
 776     FIXME("(%04x): stub\n", someTask );
 777     return 0;
 778 }
 779
 780 /***********************************************************************
 781  *           MakeProcInstance  (KERNEL.51)
 782  */
 783 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 784 {
 785     BYTE *thunk,*lfunc;
 786     SEGPTR thunkaddr;
 787     WORD hInstanceSelector;
 788
 789     hInstanceSelector = GlobalHandleToSel16(hInstance);
 790
 791     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 792
 793     if (!HIWORD(func)) {
 794       /* Win95 actually protects via SEH, but this is better for debugging */
 795       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 796       return (FARPROC16)0;
 797     }
 798
 799     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 800       && (hInstance != 0)
 801       && (hInstance != 0xffff) )
 802     {
 803         /* calling MPI with a foreign DSEG is invalid ! */
 804         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 805                    hInstance,CURRENT_DS);
 806     }
 807
 808     /* Always use the DSEG that MPI was entered with.
 809      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 810      * as CURRENT_DS provides the DSEG value we need.
 811      * ("calling" DS, *not* "task" DS !) */
 812     hInstanceSelector = CURRENT_DS;
 813     hInstance = GlobalHandle16(hInstanceSelector);
 814
 815     /* no thunking for DLLs */
 816     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 817         return func;
 818
 819     thunkaddr = TASK_AllocThunk();
 820     if (!thunkaddr) return (FARPROC16)0;
 821     thunk = MapSL( thunkaddr );
 822     lfunc = MapSL( (SEGPTR)func );
 823
 824     TRACE("(%08lx,%04x): got thunk %08lx\n",
 825           (DWORD)func, hInstance, (DWORD)thunkaddr );
 826     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 827         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 828     ) {
 829         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 830     }
 831
 832     *thunk++ = 0xb8;    /* movw instance, %ax */
 833     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 834     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 835     *thunk++ = 0xea;    /* ljmp func */
 836     *(DWORD *)thunk = (DWORD)func;
 837     return (FARPROC16)thunkaddr;
 838     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 839 }
 840
 841
 842 /***********************************************************************
 843  *           FreeProcInstance  (KERNEL.52)
 844  */
 845 void WINAPI FreeProcInstance16( FARPROC16 func )
 846 {
 847     TRACE("(%08lx)\n", (DWORD)func );
 848     TASK_FreeThunk( (SEGPTR)func );
 849 }
 850
 851 /**********************************************************************
 852  *          TASK_GetCodeSegment
 853  *
 854  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 855  * and logical segment number of a given code segment.
 856  *
 857  * 'proc' either *is* already a pair of module handle and segment number,
 858  * in which case there's nothing to do.  Otherwise, it is a pointer to
 859  * a function, and we need to retrieve the code segment.  If the pointer
 860  * happens to point to a thunk, we'll retrieve info about the code segment
 861  * where the function pointed to by the thunk resides, not the thunk itself.
 862  *
 863  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 864  *        the function the snoop code will return to ...
 865  *
 866  */
 867 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 868                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 869 {
 870     NE_MODULE *pModule = NULL;
 871     SEGTABLEENTRY *pSeg = NULL;
 872     int segNr=0;
 873
 874     /* Try pair of module handle / segment number */
 875     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 876     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 877     {
 878         segNr = LOWORD( proc );
 879         if ( segNr && segNr <= pModule->seg_count )
 880             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 881     }
 882
 883     /* Try thunk or function */
 884     else
 885     {
 886         BYTE *thunk = MapSL( (SEGPTR)proc );
 887         WORD selector;
 888
 889         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 890             selector = thunk[6] + (thunk[7] << 8);
 891         else
 892             selector = HIWORD( proc );
 893
 894         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 895         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 896
 897         if ( pModule )
 898             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 899                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 900                     break;
 901
 902         if ( pModule && segNr > pModule->seg_count )
 903             pSeg = NULL;
 904     }
 905
 906     /* Abort if segment not found */
 907
 908     if ( !pModule || !pSeg )
 909         return FALSE;
 910
 911     /* Return segment data */
 912
 913     if ( ppModule ) *ppModule = pModule;
 914     if ( ppSeg    ) *ppSeg    = pSeg;
 915     if ( pSegNr   ) *pSegNr   = segNr;
 916
 917     return TRUE;
 918 }
 919
 920 /**********************************************************************
 921  *          GetCodeHandle    (KERNEL.93)
 922  */
 923 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 924 {
 925     SEGTABLEENTRY *pSeg;
 926
 927     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 928         return (HANDLE16)0;
 929
 930     return pSeg->hSeg;
 931 }
 932
 933 /**********************************************************************
 934  *          GetCodeInfo    (KERNEL.104)
 935  */
 936 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 937 {
 938     NE_MODULE *pModule;
 939     SEGTABLEENTRY *pSeg;
 940     int segNr;
 941
 942     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 943         return FALSE;
 944
 945     /* Fill in segment information */
 946
 947     segInfo->offSegment = pSeg->filepos;
 948     segInfo->cbSegment  = pSeg->size;
 949     segInfo->flags      = pSeg->flags;
 950     segInfo->cbAlloc    = pSeg->minsize;
 951     segInfo->h          = pSeg->hSeg;
 952     segInfo->alignShift = pModule->alignment;
 953
 954     if ( segNr == pModule->dgroup )
 955         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 956
 957     /* Return module handle in %es */
 958
 959     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 960
 961     return TRUE;
 962 }
 963
 964
 965 /**********************************************************************
 966  *          DefineHandleTable    (KERNEL.94)
 967  */
 968 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 969 {
 970     FIXME("(%04x): stub ?\n", wOffset);
 971     return TRUE;
 972 }
 973
 974
 975 /***********************************************************************
 976  *           SetTaskQueue  (KERNEL.34)
 977  */
 978 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 979 {
 980     HQUEUE16 hPrev;
 981     TDB *pTask;
 982
 983     if (!hTask) hTask = GetCurrentTask();
 984     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 985
 986     hPrev = pTask->hQueue;
 987     pTask->hQueue = hQueue;
 988
 989     return hPrev;
 990 }
 991
 992
 993 /***********************************************************************
 994  *           GetTaskQueue  (KERNEL.35)
 995  */
 996 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
 997 {
 998     TDB *pTask;
 999
1000     if (!hTask) hTask = GetCurrentTask();
1001     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1002     return pTask->hQueue;
1003 }
1004
1005 /***********************************************************************
1006  *           SetThreadQueue  (KERNEL.463)
1007  */
1008 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1009 {
1010     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1011     HQUEUE16 oldQueue = teb? teb->queue : 0;
1012
1013     if ( teb )
1014     {
1015         teb->queue = hQueue;
1016
1017         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1018             SetTaskQueue16( teb->htask16, hQueue );
1019     }
1020
1021     return oldQueue;
1022 }
1023
1024 /***********************************************************************
1025  *           GetThreadQueue  (KERNEL.464)
1026  */
1027 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1028 {
1029     TEB *teb = NULL;
1030     if ( !thread )
1031         teb = NtCurrentTeb();
1032     else if ( HIWORD(thread) )
1033         teb = THREAD_IdToTEB( thread );
1034     else if ( IsTask16( (HTASK16)thread ) )
1035         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1036
1037     return (HQUEUE16)(teb? teb->queue : 0);
1038 }
1039
1040 /***********************************************************************
1041  *           SetFastQueue  (KERNEL.624)
1042  */
1043 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1044 {
1045     TEB *teb = NULL;
1046     if ( !thread )
1047         teb = NtCurrentTeb();
1048     else if ( HIWORD(thread) )
1049         teb = THREAD_IdToTEB( thread );
1050     else if ( IsTask16( (HTASK16)thread ) )
1051         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1052
1053     if ( teb ) teb->queue = hQueue;
1054 }
1055
1056 /***********************************************************************
1057  *           GetFastQueue  (KERNEL.625)
1058  */
1059 HQUEUE16 WINAPI GetFastQueue16( void )
1060 {
1061     HQUEUE16 ret = NtCurrentTeb()->queue;
1062
1063     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1064     return ret;
1065 }
1066
1067 /***********************************************************************
1068  *           SwitchStackTo   (KERNEL.108)
1069  */
1070 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1071 {
1072     TDB *pTask;
1073     STACK16FRAME *oldFrame, *newFrame;
1074     INSTANCEDATA *pData;
1075     UINT16 copySize;
1076
1077     if (!(pTask = TASK_GetCurrent())) return;
1078     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1079     TRACE("old=%04x:%04x new=%04x:%04x\n",
1080           SELECTOROF( pTask->teb->cur_stack ),
1081           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1082
1083     /* Save the old stack */
1084
1085     oldFrame = THREAD_STACK16( pTask->teb );
1086     /* pop frame + args and push bp */
1087     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1088                            + 2 * sizeof(WORD);
1089     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1090     pData->stacktop    = top;
1091     pData->stackmin    = ptr;
1092     pData->stackbottom = ptr;
1093
1094     /* Switch to the new stack */
1095
1096     /* Note: we need to take the 3 arguments into account; otherwise,
1097      * the stack will underflow upon return from this function.
1098      */
1099     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1100     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1101     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1102     newFrame = THREAD_STACK16( pTask->teb );
1103
1104     /* Copy the stack frame and the local variables to the new stack */
1105
1106     memmove( newFrame, oldFrame, copySize );
1107     newFrame->bp = ptr;
1108     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1109 }
1110
1111
1112 /***********************************************************************
1113  *           SwitchStackBack   (KERNEL.109)
1114  */
1115 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1116 {
1117     STACK16FRAME *oldFrame, *newFrame;
1118     INSTANCEDATA *pData;
1119
1120     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1121         return;
1122     if (!pData->old_ss_sp)
1123     {
1124         WARN("No previous SwitchStackTo\n" );
1125         return;
1126     }
1127     TRACE("restoring stack %04x:%04x\n",
1128           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1129
1130     oldFrame = CURRENT_STACK16;
1131
1132     /* Pop bp from the previous stack */
1133
1134     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1135     pData->old_ss_sp += sizeof(WORD);
1136
1137     /* Switch back to the old stack */
1138
1139     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1140     context->SegSs = SELECTOROF(pData->old_ss_sp);
1141     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1142     pData->old_ss_sp = 0;
1143
1144     /* Build a stack frame for the return */
1145
1146     newFrame = CURRENT_STACK16;
1147     newFrame->frame32     = oldFrame->frame32;
1148     newFrame->module_cs   = oldFrame->module_cs;
1149     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1150     newFrame->entry_ip    = oldFrame->entry_ip;
1151 }
1152
1153
1154 /***********************************************************************
1155  *           GetTaskQueueDS  (KERNEL.118)
1156  */
1157 void WINAPI GetTaskQueueDS16(void)
1158 {
1159     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1160 }
1161
1162
1163 /***********************************************************************
1164  *           GetTaskQueueES  (KERNEL.119)
1165  */
1166 void WINAPI GetTaskQueueES16(void)
1167 {
1168     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1169 }
1170
1171
1172 /***********************************************************************
1173  *           GetCurrentTask   (KERNEL32.@)
1174  */
1175 HTASK16 WINAPI GetCurrentTask(void)
1176 {
1177     return NtCurrentTeb()->htask16;
1178 }
1179
1180 /***********************************************************************
1181  *           GetCurrentTask   (KERNEL.36)
1182  */
1183 DWORD WINAPI WIN16_GetCurrentTask(void)
1184 {
1185     /* This is the version used by relay code; the first task is */
1186     /* returned in the high word of the result */
1187     return MAKELONG( GetCurrentTask(), hFirstTask );
1188 }
1189
1190
1191 /***********************************************************************
1192  *           GetCurrentPDB   (KERNEL.37)
1193  *
1194  * UNDOC: returns PSP of KERNEL in high word
1195  */
1196 DWORD WINAPI GetCurrentPDB16(void)
1197 {
1198     TDB *pTask;
1199
1200     if (!(pTask = TASK_GetCurrent())) return 0;
1201     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1202 }
1203
1204
1205 /***********************************************************************
1206  *           GetCurPID   (KERNEL.157)
1207  */
1208 DWORD WINAPI GetCurPID16( DWORD unused )
1209 {
1210     return 0;
1211 }
1212
1213
1214 /***********************************************************************
1215  *           GetInstanceData   (KERNEL.54)
1216  */
1217 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1218 {
1219     char *ptr = (char *)GlobalLock16( instance );
1220     if (!ptr || !len) return 0;
1221     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1222     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1223     return len;
1224 }
1225
1226
1227 /***********************************************************************
1228  *           GetExeVersion   (KERNEL.105)
1229  */
1230 WORD WINAPI GetExeVersion16(void)
1231 {
1232     TDB *pTask;
1233
1234     if (!(pTask = TASK_GetCurrent())) return 0;
1235     return pTask->version;
1236 }
1237
1238
1239 /***********************************************************************
1240  *           SetErrorMode   (KERNEL.107)
1241  */
1242 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1243 {
1244     TDB *pTask;
1245     if (!(pTask = TASK_GetCurrent())) return 0;
1246     pTask->error_mode = mode;
1247     return SetErrorMode( mode );
1248 }
1249
1250
1251 /***********************************************************************
1252  *           GetNumTasks   (KERNEL.152)
1253  */
1254 UINT16 WINAPI GetNumTasks16(void)
1255 {
1256     return nTaskCount;
1257 }
1258
1259
1260 /***********************************************************************
1261  *           GetTaskDS   (KERNEL.155)
1262  *
1263  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1264  * I don't think we need to bother with this.
1265  */
1266 HINSTANCE16 WINAPI GetTaskDS16(void)
1267 {
1268     TDB *pTask;
1269
1270     if (!(pTask = TASK_GetCurrent())) return 0;
1271     return GlobalHandleToSel16(pTask->hInstance);
1272 }
1273
1274 /***********************************************************************
1275  *           GetDummyModuleHandleDS   (KERNEL.602)
1276  */
1277 WORD WINAPI GetDummyModuleHandleDS16(void)
1278 {
1279     TDB *pTask;
1280     WORD selector;
1281
1282     if (!(pTask = TASK_GetCurrent())) return 0;
1283     if (!(pTask->flags & TDBF_WIN32)) return 0;
1284     selector = GlobalHandleToSel16( pTask->hModule );
1285     CURRENT_DS = selector;
1286     return selector;
1287 }
1288
1289 /***********************************************************************
1290  *           IsTask   (KERNEL.320)
1291  */
1292 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1293 {
1294     TDB *pTask;
1295
1296     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1297     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1298     return (pTask->magic == TDB_MAGIC);
1299 }
1300
1301
1302 /***********************************************************************
1303  *           IsWinOldApTask   (KERNEL.158)
1304  */
1305 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1306 {
1307     /* should return bit 0 of byte 0x48 in PSP */
1308     return FALSE;
1309 }
1310
1311 /***********************************************************************
1312  *           SetTaskSignalProc   (KERNEL.38)
1313  */
1314 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1315 {
1316     TDB *pTask;
1317     FARPROC16 oldProc;
1318
1319     if (!hTask) hTask = GetCurrentTask();
1320     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1321     oldProc = pTask->userhandler;
1322     pTask->userhandler = proc;
1323     return oldProc;
1324 }
1325
1326 /***********************************************************************
1327  *           TASK_CallTaskSignalProc
1328  */
1329 /* ### start build ### */
1330 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1331 /* ### stop build ### */
1332 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1333 {
1334     TDB *pTask = TASK_GetCurrent();
1335     if ( !pTask || !pTask->userhandler ) return;
1336
1337     TASK_CallTo16_word_wwwww( pTask->userhandler,
1338                               hTaskOrModule, uCode, 0,
1339                               pTask->hInstance, pTask->hQueue );
1340 }
1341
1342 /***********************************************************************
1343  *           SetSigHandler   (KERNEL.140)
1344  */
1345 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1346                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1347 {
1348     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1349           newhandler,oldhandler,oldmode,newmode,flag );
1350
1351     if (flag != 1) return 0;
1352     if (!newmode) newhandler = NULL;  /* Default handler */
1353     if (newmode != 4)
1354     {
1355         TDB *pTask;
1356
1357         if (!(pTask = TASK_GetCurrent())) return 0;
1358         if (oldmode) *oldmode = pTask->signal_flags;
1359         pTask->signal_flags = newmode;
1360         if (oldhandler) *oldhandler = pTask->sighandler;
1361         pTask->sighandler = newhandler;
1362     }
1363     return 0;
1364 }
1365
1366
1367 /***********************************************************************
1368  *           GlobalNotify   (KERNEL.154)
1369  *
1370  * Note that GlobalNotify does _not_ return the old NotifyProc
1371  * -- contrary to LocalNotify !!
1372  */
1373 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1374 {
1375     TDB *pTask;
1376
1377     if (!(pTask = TASK_GetCurrent())) return;
1378     pTask->discardhandler = proc;
1379 }
1380
1381
1382 /***********************************************************************
1383  *           GetExePtrHelper
1384  */
1385 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1386 {
1387     char *ptr;
1388     HANDLE16 owner;
1389
1390       /* Check for module handle */
1391
1392     if (!(ptr = GlobalLock16( handle ))) return 0;
1393     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1394
1395       /* Search for this handle inside all tasks */
1396
1397     *hTask = hFirstTask;
1398     while (*hTask)
1399     {
1400         TDB *pTask = TASK_GetPtr( *hTask );
1401         if ((*hTask == handle) ||
1402             (pTask->hInstance == handle) ||
1403             (pTask->hQueue == handle) ||
1404             (pTask->hPDB == handle)) return pTask->hModule;
1405         *hTask = pTask->hNext;
1406     }
1407
1408       /* Check the owner for module handle */
1409
1410     owner = FarGetOwner16( handle );
1411     if (!(ptr = GlobalLock16( owner ))) return 0;
1412     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1413
1414       /* Search for the owner inside all tasks */
1415
1416     *hTask = hFirstTask;
1417     while (*hTask)
1418     {
1419         TDB *pTask = TASK_GetPtr( *hTask );
1420         if ((*hTask == owner) ||
1421             (pTask->hInstance == owner) ||
1422             (pTask->hQueue == owner) ||
1423             (pTask->hPDB == owner)) return pTask->hModule;
1424         *hTask = pTask->hNext;
1425     }
1426
1427     return 0;
1428 }
1429
1430 /***********************************************************************
1431  *           GetExePtr   (KERNEL.133)
1432  */
1433 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1434 {
1435     HTASK16 hTask = 0;
1436     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1437     STACK16FRAME *frame = CURRENT_STACK16;
1438     frame->ecx = hModule;
1439     if (hTask) frame->es = hTask;
1440     return hModule;
1441 }
1442
1443
1444 /***********************************************************************
1445  *           K228   (KERNEL.228)
1446  */
1447 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1448 {
1449     HTASK16 hTask = 0;
1450     return GetExePtrHelper( handle, &hTask );
1451 }
1452
1453
1454 /***********************************************************************
1455  *           TaskFirst   (TOOLHELP.63)
1456  */
1457 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1458 {
1459     lpte->hNext = hFirstTask;
1460     return TaskNext16( lpte );
1461 }
1462
1463
1464 /***********************************************************************
1465  *           TaskNext   (TOOLHELP.64)
1466  */
1467 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1468 {
1469     TDB *pTask;
1470     INSTANCEDATA *pInstData;
1471
1472     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1473     if (!lpte->hNext) return FALSE;
1474
1475     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1476     while (1) {
1477         pTask = TASK_GetPtr( lpte->hNext );
1478         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1479         if (pTask->hInstance)
1480             break;
1481         lpte->hNext = pTask->hNext;
1482     }
1483     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1484     lpte->hTask         = lpte->hNext;
1485     lpte->hTaskParent   = pTask->hParent;
1486     lpte->hInst         = pTask->hInstance;
1487     lpte->hModule       = pTask->hModule;
1488     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1489     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1490     lpte->wStackTop     = pInstData->stacktop;
1491     lpte->wStackMinimum = pInstData->stackmin;
1492     lpte->wStackBottom  = pInstData->stackbottom;
1493     lpte->wcEvents      = pTask->nEvents;
1494     lpte->hQueue        = pTask->hQueue;
1495     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1496     lpte->wPSPOffset    = 0x100;  /*??*/
1497     lpte->hNext         = pTask->hNext;
1498     return TRUE;
1499 }
1500
1501
1502 /***********************************************************************
1503  *           TaskFindHandle   (TOOLHELP.65)
1504  */
1505 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1506 {
1507     lpte->hNext = hTask;
1508     return TaskNext16( lpte );
1509 }
1510
1511
1512 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1513
1514 /**************************************************************************
1515  *           FatalAppExit   (KERNEL.137)
1516  */
1517 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1518 {
1519     TDB *pTask = TASK_GetCurrent();
1520
1521     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1522     {
1523         HMODULE mod = GetModuleHandleA( "user32.dll" );
1524         if (mod)
1525         {
1526             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1527             if (pMessageBoxA)
1528             {
1529                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1530                 goto done;
1531             }
1532         }
1533         ERR( "%s\n", debugstr_a(str) );
1534     }
1535  done:
1536     ExitThread(0xff);
1537 }
1538
1539
1540 /***********************************************************************
1541  *           TerminateApp   (TOOLHELP.77)
1542  *
1543  * See "Undocumented Windows".
1544  */
1545 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1546 {
1547     if (hTask && hTask != GetCurrentTask())
1548     {
1549         FIXME("cannot terminate task %x\n", hTask);
1550         return;
1551     }
1552
1553     if (wFlags & NO_UAE_BOX)
1554     {
1555         UINT16 old_mode;
1556         old_mode = SetErrorMode16(0);
1557         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1558     }
1559     FatalAppExit16( 0, NULL );
1560
1561     /* hmm, we're still alive ?? */
1562
1563     /* check undocumented flag */
1564     if (!(wFlags & 0x8000))
1565         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1566
1567     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1568        but let's just call ExitThread */
1569     ExitThread(0xff);
1570 }
1571
1572
1573 /***********************************************************************
1574  *           GetAppCompatFlags   (KERNEL.354)
1575  */
1576 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1577 {
1578     TDB *pTask;
1579
1580     if (!hTask) hTask = GetCurrentTask();
1581     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1582     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1583     return pTask->compat_flags;
1584 }