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 "miscemu.h"
  42 #include "module.h"
  43 #include "winternl.h"
  44 #include "selectors.h"
  45 #include "wine/server.h"
  46 #include "syslevel.h"
  47 #include "stackframe.h"
  48 #include "task.h"
  49 #include "thread.h"
  50 #include "toolhelp.h"
  51
  52 #include "wine/debug.h"
  53
  54 WINE_DEFAULT_DEBUG_CHANNEL(task);
  55 WINE_DECLARE_DEBUG_CHANNEL(relay);
  56 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  57
  58   /* Min. number of thunks allocated when creating a new segment */
  59 #define MIN_THUNKS  32
  60
  61
  62 static THHOOK DefaultThhook;
  63 THHOOK *pThhook = &DefaultThhook;
  64
  65 #define hCurrentTask (pThhook->CurTDB)
  66 #define hFirstTask   (pThhook->HeadTDB)
  67 #define hLockedTask  (pThhook->LockTDB)
  68
  69 static UINT16 nTaskCount = 0;
  70
  71 static HTASK16 initial_task;
  72
  73 /***********************************************************************
  74  *           TASK_InstallTHHook
  75  */
  76 void TASK_InstallTHHook( THHOOK *pNewThhook )
  77 {
  78      THHOOK *pOldThhook = pThhook;
  79
  80      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  81
  82      *pThhook = *pOldThhook;
  83 }
  84
  85 /***********************************************************************
  86  *           TASK_GetNextTask
  87  */
  88 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  89 {
  90     TDB* pTask = TASK_GetPtr( hTask );
  91
  92     if (pTask->hNext) return pTask->hNext;
  93     return (hFirstTask != hTask) ? hFirstTask : 0;
  94 }
  95
  96
  97 /***********************************************************************
  98  *           TASK_GetPtr
  99  */
 100 TDB *TASK_GetPtr( HTASK16 hTask )
 101 {
 102     return GlobalLock16( hTask );
 103 }
 104
 105
 106 /***********************************************************************
 107  *           TASK_GetCurrent
 108  */
 109 TDB *TASK_GetCurrent(void)
 110 {
 111     return TASK_GetPtr( GetCurrentTask() );
 112 }
 113
 114
 115 /***********************************************************************
 116  *           TASK_LinkTask
 117  */
 118 static void TASK_LinkTask( HTASK16 hTask )
 119 {
 120     HTASK16 *prevTask;
 121     TDB *pTask;
 122
 123     if (!(pTask = TASK_GetPtr( hTask ))) return;
 124     prevTask = &hFirstTask;
 125     while (*prevTask)
 126     {
 127         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 128         if (prevTaskPtr->priority >= pTask->priority) break;
 129         prevTask = &prevTaskPtr->hNext;
 130     }
 131     pTask->hNext = *prevTask;
 132     *prevTask = hTask;
 133     nTaskCount++;
 134 }
 135
 136
 137 /***********************************************************************
 138  *           TASK_UnlinkTask
 139  */
 140 static void TASK_UnlinkTask( HTASK16 hTask )
 141 {
 142     HTASK16 *prevTask;
 143     TDB *pTask;
 144
 145     prevTask = &hFirstTask;
 146     while (*prevTask && (*prevTask != hTask))
 147     {
 148         pTask = TASK_GetPtr( *prevTask );
 149         prevTask = &pTask->hNext;
 150     }
 151     if (*prevTask)
 152     {
 153         pTask = TASK_GetPtr( *prevTask );
 154         *prevTask = pTask->hNext;
 155         pTask->hNext = 0;
 156         nTaskCount--;
 157     }
 158 }
 159
 160
 161 /***********************************************************************
 162  *           TASK_CreateThunks
 163  *
 164  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 165  * and containing 'count' entries.
 166  */
 167 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 168 {
 169     int i;
 170     WORD free;
 171     THUNKS *pThunk;
 172
 173     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 174     pThunk->next = 0;
 175     pThunk->magic = THUNK_MAGIC;
 176     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 177     free = pThunk->free;
 178     for (i = 0; i < count-1; i++)
 179     {
 180         free += 8;  /* Offset of next thunk */
 181         pThunk->thunks[4*i] = free;
 182     }
 183     pThunk->thunks[4*i] = 0;  /* Last thunk */
 184 }
 185
 186
 187 /***********************************************************************
 188  *           TASK_AllocThunk
 189  *
 190  * Allocate a thunk for MakeProcInstance().
 191  */
 192 static SEGPTR TASK_AllocThunk(void)
 193 {
 194     TDB *pTask;
 195     THUNKS *pThunk;
 196     WORD sel, base;
 197
 198     if (!(pTask = TASK_GetCurrent())) return 0;
 199     sel = pTask->hCSAlias;
 200     pThunk = &pTask->thunks;
 201     base = (int)pThunk - (int)pTask;
 202     while (!pThunk->free)
 203     {
 204         sel = pThunk->next;
 205         if (!sel)  /* Allocate a new segment */
 206         {
 207             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 208                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 209             if (!sel) return (SEGPTR)0;
 210             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 211             pThunk->next = sel;
 212         }
 213         pThunk = (THUNKS *)GlobalLock16( sel );
 214         base = 0;
 215     }
 216     base += pThunk->free;
 217     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 218     return MAKESEGPTR( sel, base );
 219 }
 220
 221
 222 /***********************************************************************
 223  *           TASK_FreeThunk
 224  *
 225  * Free a MakeProcInstance() thunk.
 226  */
 227 static BOOL TASK_FreeThunk( SEGPTR thunk )
 228 {
 229     TDB *pTask;
 230     THUNKS *pThunk;
 231     WORD sel, base;
 232
 233     if (!(pTask = TASK_GetCurrent())) return 0;
 234     sel = pTask->hCSAlias;
 235     pThunk = &pTask->thunks;
 236     base = (int)pThunk - (int)pTask;
 237     while (sel && (sel != HIWORD(thunk)))
 238     {
 239         sel = pThunk->next;
 240         pThunk = (THUNKS *)GlobalLock16( sel );
 241         base = 0;
 242     }
 243     if (!sel) return FALSE;
 244     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 245     pThunk->free = LOWORD(thunk) - base;
 246     return TRUE;
 247 }
 248
 249
 250 /***********************************************************************
 251  *           TASK_Create
 252  *
 253  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 254  *       to be careful to protect global data structures. We do this
 255  *       by entering the Win16Lock while linking the task into the
 256  *       global task list.
 257  */
 258 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, TEB *teb, LPCSTR cmdline, BYTE len )
 259 {
 260     HTASK16 hTask;
 261     TDB *pTask;
 262     char name[10];
 263     FARPROC16 proc;
 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, pModule->self );
 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     = pModule->self;
 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->expected_version;
 286     pTask->hModule       = pModule->self;
 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     GetModuleName16( pModule->self, name, sizeof(name) );
 304     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 305
 306       /* Allocate a selector for the PDB */
 307
 308     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 309                                       pModule->self, WINE_LDT_FLAGS_DATA );
 310
 311       /* Fill the PDB */
 312
 313     pTask->pdb.int20 = 0x20cd;
 314     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 315     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 316     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 317     pTask->pdb.savedint22 = 0;
 318     pTask->pdb.savedint23 = 0;
 319     pTask->pdb.savedint24 = 0;
 320     pTask->pdb.fileHandlesPtr =
 321         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 322     pTask->pdb.hFileHandles = 0;
 323     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 324     /* FIXME: should we make a copy of the environment? */
 325     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 326     pTask->pdb.nbFiles        = 20;
 327
 328     /* Fill the command line */
 329
 330     if (!cmdline)
 331     {
 332         cmdline = GetCommandLineA();
 333         /* remove the first word (program name) */
 334         if (*cmdline == '"')
 335             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 336         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 337         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 338         len = strlen(cmdline);
 339     }
 340     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 341     pTask->pdb.cmdLine[0] = len;
 342     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 343     /* pTask->pdb.cmdLine[len+1] = 0; */
 344
 345     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 346
 347       /* Get the compatibility flags */
 348
 349     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 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( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
 421                          cmdShow, NtCurrentTeb(), NULL, 0 );
 422     if (!pTask)
 423     {
 424         ERR("could not create task for main process\n");
 425         ExitProcess(1);
 426     }
 427
 428     /* Add the task to the linked list */
 429     /* (no need to get the win16 lock, we are the only thread at this point) */
 430     TASK_LinkTask( pTask->hSelf );
 431 }
 432
 433
 434 /* startup routine for a new 16-bit thread */
 435 static DWORD CALLBACK task_start( TDB *pTask )
 436 {
 437     DWORD ret;
 438
 439     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 440     NtCurrentTeb()->htask16 = pTask->hSelf;
 441
 442     _EnterWin16Lock();
 443     TASK_LinkTask( pTask->hSelf );
 444     pTask->teb = NtCurrentTeb();
 445     ret = NE_StartTask();
 446     _LeaveWin16Lock();
 447     return ret;
 448 }
 449
 450
 451 /***********************************************************************
 452  *           TASK_SpawnTask
 453  *
 454  * Spawn a new 16-bit task.
 455  */
 456 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 457                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 458 {
 459     TDB *pTask;
 460
 461     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 462     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 463     {
 464         TASK_DeleteTask( pTask->hSelf );
 465         return 0;
 466     }
 467     return pTask->hSelf;
 468 }
 469
 470
 471 /***********************************************************************
 472  *           TASK_ExitTask
 473  */
 474 void TASK_ExitTask(void)
 475 {
 476     TDB *pTask;
 477     DWORD lockCount;
 478
 479     /* Enter the Win16Lock to protect global data structures */
 480     _EnterWin16Lock();
 481
 482     pTask = TASK_GetCurrent();
 483     if ( !pTask )
 484     {
 485         _LeaveWin16Lock();
 486         return;
 487     }
 488
 489     TRACE("Killing task %04x\n", pTask->hSelf );
 490
 491     /* Perform USER cleanup */
 492
 493     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 494     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 495     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 496     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 497
 498     /* Remove the task from the list to be sure we never switch back to it */
 499     TASK_UnlinkTask( pTask->hSelf );
 500
 501     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 502     {
 503         TRACE("this is the last task, exiting\n" );
 504         ExitKernel16();
 505     }
 506
 507     if( nTaskCount )
 508     {
 509         TDB* p = TASK_GetPtr( hFirstTask );
 510         while( p )
 511         {
 512             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 513             p = TASK_GetPtr( p->hNext );
 514         }
 515     }
 516
 517     pTask->nEvents = 0;
 518
 519     if ( hLockedTask == pTask->hSelf )
 520         hLockedTask = 0;
 521
 522     TASK_DeleteTask( pTask->hSelf );
 523
 524     /* ... and completely release the Win16Lock, just in case. */
 525     ReleaseThunkLock( &lockCount );
 526 }
 527
 528
 529 /***********************************************************************
 530  *           InitTask  (KERNEL.91)
 531  *
 532  * Called by the application startup code.
 533  */
 534 void WINAPI InitTask16( CONTEXT86 *context )
 535 {
 536     TDB *pTask;
 537     INSTANCEDATA *pinstance;
 538     SEGPTR ptr;
 539
 540     context->Eax = 0;
 541     if (!(pTask = TASK_GetCurrent())) return;
 542
 543     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 544        as some apps, notably Visual Basic apps, *modify* the heap/stack
 545        size of the instance data segment before calling InitTask() */
 546
 547     /* Initialize the INSTANCEDATA structure */
 548     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 549     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 550     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 551     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 552                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 553
 554     /* Initialize the local heap */
 555     if (LOWORD(context->Ecx))
 556         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 557
 558     /* Initialize implicitly loaded DLLs */
 559     NE_InitializeDLLs( pTask->hModule );
 560     NE_DllProcessAttach( pTask->hModule );
 561
 562     /* Registers on return are:
 563      * ax     1 if OK, 0 on error
 564      * cx     stack limit in bytes
 565      * dx     cmdShow parameter
 566      * si     instance handle of the previous instance
 567      * di     instance handle of the new task
 568      * es:bx  pointer to command line inside PSP
 569      *
 570      * 0 (=%bp) is pushed on the stack
 571      */
 572     ptr = stack16_push( sizeof(WORD) );
 573     *(WORD *)MapSL(ptr) = 0;
 574     context->Esp -= 2;
 575
 576     context->Eax = 1;
 577
 578     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 579     else
 580     {
 581         LPBYTE p = &pTask->pdb.cmdLine[1];
 582         while ((*p == ' ') || (*p == '\t')) p++;
 583         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 584     }
 585     context->Ecx   = pinstance->stacktop;
 586     context->Edx   = pTask->nCmdShow;
 587     context->Esi   = (DWORD)pTask->hPrevInstance;
 588     context->Edi   = (DWORD)pTask->hInstance;
 589     context->SegEs = (WORD)pTask->hPDB;
 590 }
 591
 592
 593 /***********************************************************************
 594  *           WaitEvent  (KERNEL.30)
 595  */
 596 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 597 {
 598     TDB *pTask;
 599
 600     if (!hTask) hTask = GetCurrentTask();
 601     pTask = TASK_GetPtr( hTask );
 602
 603     if (pTask->flags & TDBF_WIN32)
 604     {
 605         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 606         return TRUE;
 607     }
 608
 609     if (pTask->nEvents > 0)
 610     {
 611         pTask->nEvents--;
 612         return FALSE;
 613     }
 614
 615     if (pTask->teb == NtCurrentTeb())
 616     {
 617         DWORD lockCount;
 618
 619         NtResetEvent( pTask->hEvent, NULL );
 620         ReleaseThunkLock( &lockCount );
 621         SYSLEVEL_CheckNotLevel( 1 );
 622         WaitForSingleObject( pTask->hEvent, INFINITE );
 623         RestoreThunkLock( lockCount );
 624         if (pTask->nEvents > 0) pTask->nEvents--;
 625     }
 626     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 627
 628     return TRUE;
 629 }
 630
 631
 632 /***********************************************************************
 633  *           PostEvent  (KERNEL.31)
 634  */
 635 void WINAPI PostEvent16( HTASK16 hTask )
 636 {
 637     TDB *pTask;
 638
 639     if (!hTask) hTask = GetCurrentTask();
 640     if (!(pTask = TASK_GetPtr( hTask ))) return;
 641
 642     if (pTask->flags & TDBF_WIN32)
 643     {
 644         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 645         return;
 646     }
 647
 648     pTask->nEvents++;
 649
 650     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 651 }
 652
 653
 654 /***********************************************************************
 655  *           SetPriority  (KERNEL.32)
 656  */
 657 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 658 {
 659     TDB *pTask;
 660     INT16 newpriority;
 661
 662     if (!hTask) hTask = GetCurrentTask();
 663     if (!(pTask = TASK_GetPtr( hTask ))) return;
 664     newpriority = pTask->priority + delta;
 665     if (newpriority < -32) newpriority = -32;
 666     else if (newpriority > 15) newpriority = 15;
 667
 668     pTask->priority = newpriority + 1;
 669     TASK_UnlinkTask( pTask->hSelf );
 670     TASK_LinkTask( pTask->hSelf );
 671     pTask->priority--;
 672 }
 673
 674
 675 /***********************************************************************
 676  *           LockCurrentTask  (KERNEL.33)
 677  */
 678 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 679 {
 680     if (bLock) hLockedTask = GetCurrentTask();
 681     else hLockedTask = 0;
 682     return hLockedTask;
 683 }
 684
 685
 686 /***********************************************************************
 687  *           IsTaskLocked  (KERNEL.122)
 688  */
 689 HTASK16 WINAPI IsTaskLocked16(void)
 690 {
 691     return hLockedTask;
 692 }
 693
 694
 695 /***********************************************************************
 696  *           OldYield  (KERNEL.117)
 697  */
 698 void WINAPI OldYield16(void)
 699 {
 700    DWORD count;
 701
 702    ReleaseThunkLock(&count);
 703    RestoreThunkLock(count);
 704 }
 705
 706 /***********************************************************************
 707  *           WIN32_OldYield  (KERNEL.447)
 708  */
 709 void WINAPI WIN32_OldYield16(void)
 710 {
 711    DWORD count;
 712
 713    ReleaseThunkLock(&count);
 714    RestoreThunkLock(count);
 715 }
 716
 717 /***********************************************************************
 718  *           DirectedYield  (KERNEL.150)
 719  */
 720 void WINAPI DirectedYield16( HTASK16 hTask )
 721 {
 722     TDB *pCurTask = TASK_GetCurrent();
 723
 724     if (pCurTask->flags & TDBF_WIN32)
 725     {
 726         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 727         return;
 728     }
 729
 730     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 731
 732     pCurTask->hYieldTo = hTask;
 733     OldYield16();
 734
 735     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 736 }
 737
 738 /***********************************************************************
 739  *           Yield  (KERNEL.29)
 740  */
 741 void WINAPI Yield16(void)
 742 {
 743     TDB *pCurTask = TASK_GetCurrent();
 744
 745     if (pCurTask) pCurTask->hYieldTo = 0;
 746     if (pCurTask && pCurTask->hQueue)
 747     {
 748         HMODULE mod = GetModuleHandleA( "user32.dll" );
 749         if (mod)
 750         {
 751             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 752             if (proc)
 753             {
 754                 proc();
 755                 return;
 756             }
 757         }
 758     }
 759     OldYield16();
 760 }
 761
 762 /***********************************************************************
 763  *           KERNEL_490  (KERNEL.490)
 764  */
 765 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 766 {
 767     if ( !someTask ) return 0;
 768
 769     FIXME("(%04x): stub\n", someTask );
 770     return 0;
 771 }
 772
 773 /***********************************************************************
 774  *           MakeProcInstance  (KERNEL.51)
 775  */
 776 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 777 {
 778     BYTE *thunk,*lfunc;
 779     SEGPTR thunkaddr;
 780     WORD hInstanceSelector;
 781
 782     hInstanceSelector = GlobalHandleToSel16(hInstance);
 783
 784     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 785
 786     if (!HIWORD(func)) {
 787       /* Win95 actually protects via SEH, but this is better for debugging */
 788       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 789       return (FARPROC16)0;
 790     }
 791
 792     if (hInstance)
 793     {
 794         if ( (!(hInstance & 4)) ||
 795              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 796         {
 797             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 798                 hInstance);
 799             return 0;
 800         }
 801     }
 802
 803     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 804       && (hInstance != 0)
 805       && (hInstance != 0xffff) )
 806     {
 807         /* calling MPI with a foreign DSEG is invalid ! */
 808         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 809                    hInstance,CURRENT_DS);
 810     }
 811
 812     /* Always use the DSEG that MPI was entered with.
 813      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 814      * as CURRENT_DS provides the DSEG value we need.
 815      * ("calling" DS, *not* "task" DS !) */
 816     hInstanceSelector = CURRENT_DS;
 817     hInstance = GlobalHandle16(hInstanceSelector);
 818
 819     /* no thunking for DLLs */
 820     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 821         return func;
 822
 823     thunkaddr = TASK_AllocThunk();
 824     if (!thunkaddr) return (FARPROC16)0;
 825     thunk = MapSL( thunkaddr );
 826     lfunc = MapSL( (SEGPTR)func );
 827
 828     TRACE("(%08lx,%04x): got thunk %08lx\n",
 829           (DWORD)func, hInstance, (DWORD)thunkaddr );
 830     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 831         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 832     ) {
 833         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 834     }
 835
 836     *thunk++ = 0xb8;    /* movw instance, %ax */
 837     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 838     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 839     *thunk++ = 0xea;    /* ljmp func */
 840     *(DWORD *)thunk = (DWORD)func;
 841     return (FARPROC16)thunkaddr;
 842     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 843 }
 844
 845
 846 /***********************************************************************
 847  *           FreeProcInstance  (KERNEL.52)
 848  */
 849 void WINAPI FreeProcInstance16( FARPROC16 func )
 850 {
 851     TRACE("(%08lx)\n", (DWORD)func );
 852     TASK_FreeThunk( (SEGPTR)func );
 853 }
 854
 855 /**********************************************************************
 856  *          TASK_GetCodeSegment
 857  *
 858  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 859  * and logical segment number of a given code segment.
 860  *
 861  * 'proc' either *is* already a pair of module handle and segment number,
 862  * in which case there's nothing to do.  Otherwise, it is a pointer to
 863  * a function, and we need to retrieve the code segment.  If the pointer
 864  * happens to point to a thunk, we'll retrieve info about the code segment
 865  * where the function pointed to by the thunk resides, not the thunk itself.
 866  *
 867  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 868  *        the function the snoop code will return to ...
 869  *
 870  */
 871 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 872                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 873 {
 874     NE_MODULE *pModule = NULL;
 875     SEGTABLEENTRY *pSeg = NULL;
 876     int segNr=0;
 877
 878     /* Try pair of module handle / segment number */
 879     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 880     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 881     {
 882         segNr = LOWORD( proc );
 883         if ( segNr && segNr <= pModule->seg_count )
 884             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 885     }
 886
 887     /* Try thunk or function */
 888     else
 889     {
 890         BYTE *thunk = MapSL( (SEGPTR)proc );
 891         WORD selector;
 892
 893         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 894             selector = thunk[6] + (thunk[7] << 8);
 895         else
 896             selector = HIWORD( proc );
 897
 898         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 899         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 900
 901         if ( pModule )
 902             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 903                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 904                     break;
 905
 906         if ( pModule && segNr > pModule->seg_count )
 907             pSeg = NULL;
 908     }
 909
 910     /* Abort if segment not found */
 911
 912     if ( !pModule || !pSeg )
 913         return FALSE;
 914
 915     /* Return segment data */
 916
 917     if ( ppModule ) *ppModule = pModule;
 918     if ( ppSeg    ) *ppSeg    = pSeg;
 919     if ( pSegNr   ) *pSegNr   = segNr;
 920
 921     return TRUE;
 922 }
 923
 924 /**********************************************************************
 925  *          GetCodeHandle    (KERNEL.93)
 926  */
 927 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 928 {
 929     SEGTABLEENTRY *pSeg;
 930
 931     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 932         return (HANDLE16)0;
 933
 934     return pSeg->hSeg;
 935 }
 936
 937 /**********************************************************************
 938  *          GetCodeInfo    (KERNEL.104)
 939  */
 940 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 941 {
 942     NE_MODULE *pModule;
 943     SEGTABLEENTRY *pSeg;
 944     int segNr;
 945
 946     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 947         return FALSE;
 948
 949     /* Fill in segment information */
 950
 951     segInfo->offSegment = pSeg->filepos;
 952     segInfo->cbSegment  = pSeg->size;
 953     segInfo->flags      = pSeg->flags;
 954     segInfo->cbAlloc    = pSeg->minsize;
 955     segInfo->h          = pSeg->hSeg;
 956     segInfo->alignShift = pModule->alignment;
 957
 958     if ( segNr == pModule->dgroup )
 959         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 960
 961     /* Return module handle in %es */
 962
 963     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 964
 965     return TRUE;
 966 }
 967
 968
 969 /**********************************************************************
 970  *          DefineHandleTable    (KERNEL.94)
 971  */
 972 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 973 {
 974     FIXME("(%04x): stub ?\n", wOffset);
 975     return TRUE;
 976 }
 977
 978
 979 /***********************************************************************
 980  *           SetTaskQueue  (KERNEL.34)
 981  */
 982 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 983 {
 984     HQUEUE16 hPrev;
 985     TDB *pTask;
 986
 987     if (!hTask) hTask = GetCurrentTask();
 988     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 989
 990     hPrev = pTask->hQueue;
 991     pTask->hQueue = hQueue;
 992
 993     return hPrev;
 994 }
 995
 996
 997 /***********************************************************************
 998  *           GetTaskQueue  (KERNEL.35)
 999  */
1000 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1001 {
1002     TDB *pTask;
1003
1004     if (!hTask) hTask = GetCurrentTask();
1005     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1006     return pTask->hQueue;
1007 }
1008
1009 /***********************************************************************
1010  *           SetThreadQueue  (KERNEL.463)
1011  */
1012 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1013 {
1014     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1015     HQUEUE16 oldQueue = teb? teb->queue : 0;
1016
1017     if ( teb )
1018     {
1019         teb->queue = hQueue;
1020
1021         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1022             SetTaskQueue16( teb->htask16, hQueue );
1023     }
1024
1025     return oldQueue;
1026 }
1027
1028 /***********************************************************************
1029  *           GetThreadQueue  (KERNEL.464)
1030  */
1031 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1032 {
1033     TEB *teb = NULL;
1034     if ( !thread )
1035         teb = NtCurrentTeb();
1036     else if ( HIWORD(thread) )
1037         teb = THREAD_IdToTEB( thread );
1038     else if ( IsTask16( (HTASK16)thread ) )
1039         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1040
1041     return (HQUEUE16)(teb? teb->queue : 0);
1042 }
1043
1044 /***********************************************************************
1045  *           SetFastQueue  (KERNEL.624)
1046  */
1047 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1048 {
1049     TEB *teb = NULL;
1050     if ( !thread )
1051         teb = NtCurrentTeb();
1052     else if ( HIWORD(thread) )
1053         teb = THREAD_IdToTEB( thread );
1054     else if ( IsTask16( (HTASK16)thread ) )
1055         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1056
1057     if ( teb ) teb->queue = hQueue;
1058 }
1059
1060 /***********************************************************************
1061  *           GetFastQueue  (KERNEL.625)
1062  */
1063 HQUEUE16 WINAPI GetFastQueue16( void )
1064 {
1065     HQUEUE16 ret = NtCurrentTeb()->queue;
1066
1067     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1068     return ret;
1069 }
1070
1071 /***********************************************************************
1072  *           SwitchStackTo   (KERNEL.108)
1073  */
1074 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1075 {
1076     TDB *pTask;
1077     STACK16FRAME *oldFrame, *newFrame;
1078     INSTANCEDATA *pData;
1079     UINT16 copySize;
1080
1081     if (!(pTask = TASK_GetCurrent())) return;
1082     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1083     TRACE("old=%04x:%04x new=%04x:%04x\n",
1084           SELECTOROF( pTask->teb->cur_stack ),
1085           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1086
1087     /* Save the old stack */
1088
1089     oldFrame = THREAD_STACK16( pTask->teb );
1090     /* pop frame + args and push bp */
1091     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1092                            + 2 * sizeof(WORD);
1093     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1094     pData->stacktop    = top;
1095     pData->stackmin    = ptr;
1096     pData->stackbottom = ptr;
1097
1098     /* Switch to the new stack */
1099
1100     /* Note: we need to take the 3 arguments into account; otherwise,
1101      * the stack will underflow upon return from this function.
1102      */
1103     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1104     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1105     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1106     newFrame = THREAD_STACK16( pTask->teb );
1107
1108     /* Copy the stack frame and the local variables to the new stack */
1109
1110     memmove( newFrame, oldFrame, copySize );
1111     newFrame->bp = ptr;
1112     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1113 }
1114
1115
1116 /***********************************************************************
1117  *           SwitchStackBack   (KERNEL.109)
1118  */
1119 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1120 {
1121     STACK16FRAME *oldFrame, *newFrame;
1122     INSTANCEDATA *pData;
1123
1124     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1125         return;
1126     if (!pData->old_ss_sp)
1127     {
1128         WARN("No previous SwitchStackTo\n" );
1129         return;
1130     }
1131     TRACE("restoring stack %04x:%04x\n",
1132           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1133
1134     oldFrame = CURRENT_STACK16;
1135
1136     /* Pop bp from the previous stack */
1137
1138     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1139     pData->old_ss_sp += sizeof(WORD);
1140
1141     /* Switch back to the old stack */
1142
1143     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1144     context->SegSs = SELECTOROF(pData->old_ss_sp);
1145     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1146     pData->old_ss_sp = 0;
1147
1148     /* Build a stack frame for the return */
1149
1150     newFrame = CURRENT_STACK16;
1151     newFrame->frame32     = oldFrame->frame32;
1152     newFrame->module_cs   = oldFrame->module_cs;
1153     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1154     newFrame->entry_ip    = oldFrame->entry_ip;
1155 }
1156
1157
1158 /***********************************************************************
1159  *           GetTaskQueueDS  (KERNEL.118)
1160  */
1161 void WINAPI GetTaskQueueDS16(void)
1162 {
1163     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1164 }
1165
1166
1167 /***********************************************************************
1168  *           GetTaskQueueES  (KERNEL.119)
1169  */
1170 void WINAPI GetTaskQueueES16(void)
1171 {
1172     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1173 }
1174
1175
1176 /***********************************************************************
1177  *           GetCurrentTask   (KERNEL32.@)
1178  */
1179 HTASK16 WINAPI GetCurrentTask(void)
1180 {
1181     return NtCurrentTeb()->htask16;
1182 }
1183
1184 /***********************************************************************
1185  *           GetCurrentTask   (KERNEL.36)
1186  */
1187 DWORD WINAPI WIN16_GetCurrentTask(void)
1188 {
1189     /* This is the version used by relay code; the first task is */
1190     /* returned in the high word of the result */
1191     return MAKELONG( GetCurrentTask(), hFirstTask );
1192 }
1193
1194
1195 /***********************************************************************
1196  *           GetCurrentPDB   (KERNEL.37)
1197  *
1198  * UNDOC: returns PSP of KERNEL in high word
1199  */
1200 DWORD WINAPI GetCurrentPDB16(void)
1201 {
1202     TDB *pTask;
1203
1204     if (!(pTask = TASK_GetCurrent())) return 0;
1205     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1206 }
1207
1208
1209 /***********************************************************************
1210  *           GetCurPID   (KERNEL.157)
1211  */
1212 DWORD WINAPI GetCurPID16( DWORD unused )
1213 {
1214     return 0;
1215 }
1216
1217
1218 /***********************************************************************
1219  *           GetInstanceData   (KERNEL.54)
1220  */
1221 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1222 {
1223     char *ptr = (char *)GlobalLock16( instance );
1224     if (!ptr || !len) return 0;
1225     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1226     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1227     return len;
1228 }
1229
1230
1231 /***********************************************************************
1232  *           GetExeVersion   (KERNEL.105)
1233  */
1234 WORD WINAPI GetExeVersion16(void)
1235 {
1236     TDB *pTask;
1237
1238     if (!(pTask = TASK_GetCurrent())) return 0;
1239     return pTask->version;
1240 }
1241
1242
1243 /***********************************************************************
1244  *           SetErrorMode   (KERNEL.107)
1245  */
1246 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1247 {
1248     TDB *pTask;
1249     if (!(pTask = TASK_GetCurrent())) return 0;
1250     pTask->error_mode = mode;
1251     return SetErrorMode( mode );
1252 }
1253
1254
1255 /***********************************************************************
1256  *           GetNumTasks   (KERNEL.152)
1257  */
1258 UINT16 WINAPI GetNumTasks16(void)
1259 {
1260     return nTaskCount;
1261 }
1262
1263
1264 /***********************************************************************
1265  *           GetTaskDS   (KERNEL.155)
1266  *
1267  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1268  * I don't think we need to bother with this.
1269  */
1270 HINSTANCE16 WINAPI GetTaskDS16(void)
1271 {
1272     TDB *pTask;
1273
1274     if (!(pTask = TASK_GetCurrent())) return 0;
1275     return GlobalHandleToSel16(pTask->hInstance);
1276 }
1277
1278 /***********************************************************************
1279  *           GetDummyModuleHandleDS   (KERNEL.602)
1280  */
1281 WORD WINAPI GetDummyModuleHandleDS16(void)
1282 {
1283     TDB *pTask;
1284     WORD selector;
1285
1286     if (!(pTask = TASK_GetCurrent())) return 0;
1287     if (!(pTask->flags & TDBF_WIN32)) return 0;
1288     selector = GlobalHandleToSel16( pTask->hModule );
1289     CURRENT_DS = selector;
1290     return selector;
1291 }
1292
1293 /***********************************************************************
1294  *           IsTask   (KERNEL.320)
1295  */
1296 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1297 {
1298     TDB *pTask;
1299
1300     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1301     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1302     return (pTask->magic == TDB_MAGIC);
1303 }
1304
1305
1306 /***********************************************************************
1307  *           IsWinOldApTask   (KERNEL.158)
1308  */
1309 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1310 {
1311     /* should return bit 0 of byte 0x48 in PSP */
1312     return FALSE;
1313 }
1314
1315 /***********************************************************************
1316  *           SetTaskSignalProc   (KERNEL.38)
1317  */
1318 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1319 {
1320     TDB *pTask;
1321     FARPROC16 oldProc;
1322
1323     if (!hTask) hTask = GetCurrentTask();
1324     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1325     oldProc = pTask->userhandler;
1326     pTask->userhandler = proc;
1327     return oldProc;
1328 }
1329
1330 /***********************************************************************
1331  *           TASK_CallTaskSignalProc
1332  */
1333 /* ### start build ### */
1334 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1335 /* ### stop build ### */
1336 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1337 {
1338     TDB *pTask = TASK_GetCurrent();
1339     if ( !pTask || !pTask->userhandler ) return;
1340
1341     TASK_CallTo16_word_wwwww( pTask->userhandler,
1342                               hTaskOrModule, uCode, 0,
1343                               pTask->hInstance, pTask->hQueue );
1344 }
1345
1346 /***********************************************************************
1347  *           SetSigHandler   (KERNEL.140)
1348  */
1349 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1350                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1351 {
1352     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1353           newhandler,oldhandler,oldmode,newmode,flag );
1354
1355     if (flag != 1) return 0;
1356     if (!newmode) newhandler = NULL;  /* Default handler */
1357     if (newmode != 4)
1358     {
1359         TDB *pTask;
1360
1361         if (!(pTask = TASK_GetCurrent())) return 0;
1362         if (oldmode) *oldmode = pTask->signal_flags;
1363         pTask->signal_flags = newmode;
1364         if (oldhandler) *oldhandler = pTask->sighandler;
1365         pTask->sighandler = newhandler;
1366     }
1367     return 0;
1368 }
1369
1370
1371 /***********************************************************************
1372  *           GlobalNotify   (KERNEL.154)
1373  *
1374  * Note that GlobalNotify does _not_ return the old NotifyProc
1375  * -- contrary to LocalNotify !!
1376  */
1377 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1378 {
1379     TDB *pTask;
1380
1381     if (!(pTask = TASK_GetCurrent())) return;
1382     pTask->discardhandler = proc;
1383 }
1384
1385
1386 /***********************************************************************
1387  *           GetExePtrHelper
1388  */
1389 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1390 {
1391     char *ptr;
1392     HANDLE16 owner;
1393
1394       /* Check for module handle */
1395
1396     if (!(ptr = GlobalLock16( handle ))) return 0;
1397     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1398
1399       /* Search for this handle inside all tasks */
1400
1401     *hTask = hFirstTask;
1402     while (*hTask)
1403     {
1404         TDB *pTask = TASK_GetPtr( *hTask );
1405         if ((*hTask == handle) ||
1406             (pTask->hInstance == handle) ||
1407             (pTask->hQueue == handle) ||
1408             (pTask->hPDB == handle)) return pTask->hModule;
1409         *hTask = pTask->hNext;
1410     }
1411
1412       /* Check the owner for module handle */
1413
1414     owner = FarGetOwner16( handle );
1415     if (!(ptr = GlobalLock16( owner ))) return 0;
1416     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1417
1418       /* Search for the owner inside all tasks */
1419
1420     *hTask = hFirstTask;
1421     while (*hTask)
1422     {
1423         TDB *pTask = TASK_GetPtr( *hTask );
1424         if ((*hTask == owner) ||
1425             (pTask->hInstance == owner) ||
1426             (pTask->hQueue == owner) ||
1427             (pTask->hPDB == owner)) return pTask->hModule;
1428         *hTask = pTask->hNext;
1429     }
1430
1431     return 0;
1432 }
1433
1434 /***********************************************************************
1435  *           GetExePtr   (KERNEL.133)
1436  */
1437 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1438 {
1439     HTASK16 hTask = 0;
1440     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1441     STACK16FRAME *frame = CURRENT_STACK16;
1442     frame->ecx = hModule;
1443     if (hTask) frame->es = hTask;
1444     return hModule;
1445 }
1446
1447
1448 /***********************************************************************
1449  *           K228   (KERNEL.228)
1450  */
1451 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1452 {
1453     HTASK16 hTask = 0;
1454     return GetExePtrHelper( handle, &hTask );
1455 }
1456
1457
1458 /***********************************************************************
1459  *           TaskFirst   (TOOLHELP.63)
1460  */
1461 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1462 {
1463     lpte->hNext = hFirstTask;
1464     return TaskNext16( lpte );
1465 }
1466
1467
1468 /***********************************************************************
1469  *           TaskNext   (TOOLHELP.64)
1470  */
1471 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1472 {
1473     TDB *pTask;
1474     INSTANCEDATA *pInstData;
1475
1476     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1477     if (!lpte->hNext) return FALSE;
1478
1479     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1480     while (1) {
1481         pTask = TASK_GetPtr( lpte->hNext );
1482         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1483         if (pTask->hInstance)
1484             break;
1485         lpte->hNext = pTask->hNext;
1486     }
1487     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1488     lpte->hTask         = lpte->hNext;
1489     lpte->hTaskParent   = pTask->hParent;
1490     lpte->hInst         = pTask->hInstance;
1491     lpte->hModule       = pTask->hModule;
1492     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1493     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1494     lpte->wStackTop     = pInstData->stacktop;
1495     lpte->wStackMinimum = pInstData->stackmin;
1496     lpte->wStackBottom  = pInstData->stackbottom;
1497     lpte->wcEvents      = pTask->nEvents;
1498     lpte->hQueue        = pTask->hQueue;
1499     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1500     lpte->wPSPOffset    = 0x100;  /*??*/
1501     lpte->hNext         = pTask->hNext;
1502     return TRUE;
1503 }
1504
1505
1506 /***********************************************************************
1507  *           TaskFindHandle   (TOOLHELP.65)
1508  */
1509 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1510 {
1511     lpte->hNext = hTask;
1512     return TaskNext16( lpte );
1513 }
1514
1515
1516 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1517
1518 /**************************************************************************
1519  *           FatalAppExit   (KERNEL.137)
1520  */
1521 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1522 {
1523     TDB *pTask = TASK_GetCurrent();
1524
1525     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1526     {
1527         HMODULE mod = GetModuleHandleA( "user32.dll" );
1528         if (mod)
1529         {
1530             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1531             if (pMessageBoxA)
1532             {
1533                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1534                 goto done;
1535             }
1536         }
1537         ERR( "%s\n", debugstr_a(str) );
1538     }
1539  done:
1540     ExitThread(0xff);
1541 }
1542
1543
1544 /***********************************************************************
1545  *           TerminateApp   (TOOLHELP.77)
1546  *
1547  * See "Undocumented Windows".
1548  */
1549 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1550 {
1551     if (hTask && hTask != GetCurrentTask())
1552     {
1553         FIXME("cannot terminate task %x\n", hTask);
1554         return;
1555     }
1556
1557     if (wFlags & NO_UAE_BOX)
1558     {
1559         UINT16 old_mode;
1560         old_mode = SetErrorMode16(0);
1561         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1562     }
1563     FatalAppExit16( 0, NULL );
1564
1565     /* hmm, we're still alive ?? */
1566
1567     /* check undocumented flag */
1568     if (!(wFlags & 0x8000))
1569         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1570
1571     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1572        but let's just call ExitThread */
1573     ExitThread(0xff);
1574 }
1575
1576
1577 /***********************************************************************
1578  *           GetAppCompatFlags   (KERNEL.354)
1579  */
1580 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1581 {
1582     TDB *pTask;
1583
1584     if (!hTask) hTask = GetCurrentTask();
1585     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1586     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1587     return pTask->compat_flags;
1588 }