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 "ntddk.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     lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 294                  sizeof(pTask->curdir) - 1 );
 295
 296       /* Create the thunks block */
 297
 298     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 299
 300       /* Copy the module name */
 301
 302     GetModuleName16( pModule->self, name, sizeof(name) );
 303     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 304
 305       /* Allocate a selector for the PDB */
 306
 307     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 308                                       pModule->self, WINE_LDT_FLAGS_DATA );
 309
 310       /* Fill the PDB */
 311
 312     pTask->pdb.int20 = 0x20cd;
 313     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 314     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 315     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 316     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 317     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 318     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 319     pTask->pdb.fileHandlesPtr =
 320         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 321     pTask->pdb.hFileHandles = 0;
 322     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 323     /* FIXME: should we make a copy of the environment? */
 324     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 325     pTask->pdb.nbFiles        = 20;
 326
 327     /* Fill the command line */
 328
 329     if (!cmdline)
 330     {
 331         cmdline = GetCommandLineA();
 332         /* remove the first word (program name) */
 333         if (*cmdline == '"')
 334             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 335         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 336         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 337         len = strlen(cmdline);
 338     }
 339     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 340     pTask->pdb.cmdLine[0] = len;
 341     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 342     /* pTask->pdb.cmdLine[len+1] = 0; */
 343
 344     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 345
 346       /* Get the compatibility flags */
 347
 348     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 349
 350       /* Allocate a code segment alias for the TDB */
 351
 352     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 353                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 354
 355       /* Default DTA overwrites command line */
 356
 357     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 358
 359     /* Create scheduler event for 16-bit tasks */
 360
 361     if ( !(pTask->flags & TDBF_WIN32) )
 362         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 363
 364     /* Enter task handle into thread */
 365
 366     if (teb) teb->htask16 = hTask;
 367     if (!initial_task) initial_task = hTask;
 368
 369     return pTask;
 370 }
 371
 372
 373 /***********************************************************************
 374  *           TASK_DeleteTask
 375  */
 376 static void TASK_DeleteTask( HTASK16 hTask )
 377 {
 378     TDB *pTask;
 379     HGLOBAL16 hPDB;
 380
 381     if (!(pTask = TASK_GetPtr( hTask ))) return;
 382     hPDB = pTask->hPDB;
 383
 384     pTask->magic = 0xdead; /* invalidate signature */
 385
 386     /* Free the selector aliases */
 387
 388     GLOBAL_FreeBlock( pTask->hCSAlias );
 389     GLOBAL_FreeBlock( pTask->hPDB );
 390
 391     /* Free the task module */
 392
 393     FreeModule16( pTask->hModule );
 394
 395     /* Free the task structure itself */
 396
 397     GlobalFree16( hTask );
 398
 399     /* Free all memory used by this task (including the 32-bit stack, */
 400     /* the environment block and the thunk segments). */
 401
 402     GlobalFreeAll16( hPDB );
 403 }
 404
 405
 406 /***********************************************************************
 407  *           TASK_CreateMainTask
 408  *
 409  * Create a task for the main (32-bit) process.
 410  */
 411 void TASK_CreateMainTask(void)
 412 {
 413     TDB *pTask;
 414     STARTUPINFOA startup_info;
 415     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 416
 417     GetStartupInfoA( &startup_info );
 418     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 419     pTask = TASK_Create( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
 420                          cmdShow, NtCurrentTeb(), NULL, 0 );
 421     if (!pTask)
 422     {
 423         ERR("could not create task for main process\n");
 424         ExitProcess(1);
 425     }
 426
 427     /* Add the task to the linked list */
 428     /* (no need to get the win16 lock, we are the only thread at this point) */
 429     TASK_LinkTask( pTask->hSelf );
 430 }
 431
 432
 433 /* startup routine for a new 16-bit thread */
 434 static DWORD CALLBACK task_start( TDB *pTask )
 435 {
 436     DWORD ret;
 437
 438     NtCurrentTeb()->tibflags &= ~TEBF_WIN32;
 439     NtCurrentTeb()->htask16 = pTask->hSelf;
 440
 441     _EnterWin16Lock();
 442     TASK_LinkTask( pTask->hSelf );
 443     pTask->teb = NtCurrentTeb();
 444     ret = NE_StartTask();
 445     _LeaveWin16Lock();
 446     return ret;
 447 }
 448
 449
 450 /***********************************************************************
 451  *           TASK_SpawnTask
 452  *
 453  * Spawn a new 16-bit task.
 454  */
 455 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 456                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 457 {
 458     TDB *pTask;
 459
 460     if (!(pTask = TASK_Create( pModule, cmdShow, NULL, cmdline, len ))) return 0;
 461     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 462     {
 463         TASK_DeleteTask( pTask->hSelf );
 464         return 0;
 465     }
 466     return pTask->hSelf;
 467 }
 468
 469
 470 /***********************************************************************
 471  *           TASK_ExitTask
 472  */
 473 void TASK_ExitTask(void)
 474 {
 475     TDB *pTask;
 476     DWORD lockCount;
 477
 478     /* Enter the Win16Lock to protect global data structures */
 479     _EnterWin16Lock();
 480
 481     pTask = TASK_GetCurrent();
 482     if ( !pTask )
 483     {
 484         _LeaveWin16Lock();
 485         return;
 486     }
 487
 488     TRACE("Killing task %04x\n", pTask->hSelf );
 489
 490     /* Perform USER cleanup */
 491
 492     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 493     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 494     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 495     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 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  *           InitTask  (KERNEL.91)
 530  *
 531  * Called by the application startup code.
 532  */
 533 void WINAPI InitTask16( CONTEXT86 *context )
 534 {
 535     TDB *pTask;
 536     INSTANCEDATA *pinstance;
 537     SEGPTR ptr;
 538
 539     context->Eax = 0;
 540     if (!(pTask = TASK_GetCurrent())) return;
 541
 542     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 543        as some apps, notably Visual Basic apps, *modify* the heap/stack
 544        size of the instance data segment before calling InitTask() */
 545
 546     /* Initialize the INSTANCEDATA structure */
 547     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 548     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 549     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 550     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 551                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 552
 553     /* Initialize the local heap */
 554     if (LOWORD(context->Ecx))
 555         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 556
 557     /* Initialize implicitly loaded DLLs */
 558     NE_InitializeDLLs( pTask->hModule );
 559     NE_DllProcessAttach( pTask->hModule );
 560
 561     /* Registers on return are:
 562      * ax     1 if OK, 0 on error
 563      * cx     stack limit in bytes
 564      * dx     cmdShow parameter
 565      * si     instance handle of the previous instance
 566      * di     instance handle of the new task
 567      * es:bx  pointer to command line inside PSP
 568      *
 569      * 0 (=%bp) is pushed on the stack
 570      */
 571     ptr = stack16_push( sizeof(WORD) );
 572     *(WORD *)MapSL(ptr) = 0;
 573     context->Esp -= 2;
 574
 575     context->Eax = 1;
 576
 577     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 578     else
 579     {
 580         LPBYTE p = &pTask->pdb.cmdLine[1];
 581         while ((*p == ' ') || (*p == '\t')) p++;
 582         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 583     }
 584     context->Ecx   = pinstance->stacktop;
 585     context->Edx   = pTask->nCmdShow;
 586     context->Esi   = (DWORD)pTask->hPrevInstance;
 587     context->Edi   = (DWORD)pTask->hInstance;
 588     context->SegEs = (WORD)pTask->hPDB;
 589 }
 590
 591
 592 /***********************************************************************
 593  *           WaitEvent  (KERNEL.30)
 594  */
 595 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 596 {
 597     TDB *pTask;
 598
 599     if (!hTask) hTask = GetCurrentTask();
 600     pTask = TASK_GetPtr( hTask );
 601
 602     if (pTask->flags & TDBF_WIN32)
 603     {
 604         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 605         return TRUE;
 606     }
 607
 608     if (pTask->nEvents > 0)
 609     {
 610         pTask->nEvents--;
 611         return FALSE;
 612     }
 613
 614     if (pTask->teb == NtCurrentTeb())
 615     {
 616         DWORD lockCount;
 617
 618         NtResetEvent( pTask->hEvent, NULL );
 619         ReleaseThunkLock( &lockCount );
 620         SYSLEVEL_CheckNotLevel( 1 );
 621         WaitForSingleObject( pTask->hEvent, INFINITE );
 622         RestoreThunkLock( lockCount );
 623         if (pTask->nEvents > 0) pTask->nEvents--;
 624     }
 625     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 626
 627     return TRUE;
 628 }
 629
 630
 631 /***********************************************************************
 632  *           PostEvent  (KERNEL.31)
 633  */
 634 void WINAPI PostEvent16( HTASK16 hTask )
 635 {
 636     TDB *pTask;
 637
 638     if (!hTask) hTask = GetCurrentTask();
 639     if (!(pTask = TASK_GetPtr( hTask ))) return;
 640
 641     if (pTask->flags & TDBF_WIN32)
 642     {
 643         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 644         return;
 645     }
 646
 647     pTask->nEvents++;
 648
 649     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 650 }
 651
 652
 653 /***********************************************************************
 654  *           SetPriority  (KERNEL.32)
 655  */
 656 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 657 {
 658     TDB *pTask;
 659     INT16 newpriority;
 660
 661     if (!hTask) hTask = GetCurrentTask();
 662     if (!(pTask = TASK_GetPtr( hTask ))) return;
 663     newpriority = pTask->priority + delta;
 664     if (newpriority < -32) newpriority = -32;
 665     else if (newpriority > 15) newpriority = 15;
 666
 667     pTask->priority = newpriority + 1;
 668     TASK_UnlinkTask( pTask->hSelf );
 669     TASK_LinkTask( pTask->hSelf );
 670     pTask->priority--;
 671 }
 672
 673
 674 /***********************************************************************
 675  *           LockCurrentTask  (KERNEL.33)
 676  */
 677 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 678 {
 679     if (bLock) hLockedTask = GetCurrentTask();
 680     else hLockedTask = 0;
 681     return hLockedTask;
 682 }
 683
 684
 685 /***********************************************************************
 686  *           IsTaskLocked  (KERNEL.122)
 687  */
 688 HTASK16 WINAPI IsTaskLocked16(void)
 689 {
 690     return hLockedTask;
 691 }
 692
 693
 694 /***********************************************************************
 695  *           OldYield  (KERNEL.117)
 696  */
 697 void WINAPI OldYield16(void)
 698 {
 699    DWORD count;
 700
 701    ReleaseThunkLock(&count);
 702    RestoreThunkLock(count);
 703 }
 704
 705 /***********************************************************************
 706  *           WIN32_OldYield  (KERNEL.447)
 707  */
 708 void WINAPI WIN32_OldYield16(void)
 709 {
 710    DWORD count;
 711
 712    ReleaseThunkLock(&count);
 713    RestoreThunkLock(count);
 714 }
 715
 716 /***********************************************************************
 717  *           DirectedYield  (KERNEL.150)
 718  */
 719 void WINAPI DirectedYield16( HTASK16 hTask )
 720 {
 721     TDB *pCurTask = TASK_GetCurrent();
 722
 723     if (pCurTask->flags & TDBF_WIN32)
 724     {
 725         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 726         return;
 727     }
 728
 729     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 730
 731     pCurTask->hYieldTo = hTask;
 732     OldYield16();
 733
 734     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 735 }
 736
 737 /***********************************************************************
 738  *           Yield  (KERNEL.29)
 739  */
 740 void WINAPI Yield16(void)
 741 {
 742     TDB *pCurTask = TASK_GetCurrent();
 743
 744     if (pCurTask) pCurTask->hYieldTo = 0;
 745     if (pCurTask && pCurTask->hQueue)
 746     {
 747         HMODULE mod = GetModuleHandleA( "user32.dll" );
 748         if (mod)
 749         {
 750             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 751             if (proc)
 752             {
 753                 proc();
 754                 return;
 755             }
 756         }
 757     }
 758     OldYield16();
 759 }
 760
 761 /***********************************************************************
 762  *           KERNEL_490  (KERNEL.490)
 763  */
 764 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 765 {
 766     if ( !someTask ) return 0;
 767
 768     FIXME("(%04x): stub\n", someTask );
 769     return 0;
 770 }
 771
 772 /***********************************************************************
 773  *           MakeProcInstance  (KERNEL.51)
 774  */
 775 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 776 {
 777     BYTE *thunk,*lfunc;
 778     SEGPTR thunkaddr;
 779     WORD hInstanceSelector;
 780
 781     hInstanceSelector = GlobalHandleToSel16(hInstance);
 782
 783     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 784
 785     if (!HIWORD(func)) {
 786       /* Win95 actually protects via SEH, but this is better for debugging */
 787       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 788       return (FARPROC16)0;
 789     }
 790
 791     if (hInstance)
 792     {
 793         if ( (!(hInstance & 4)) ||
 794              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 795         {
 796             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 797                 hInstance);
 798             return 0;
 799         }
 800     }
 801
 802     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 803       && (hInstance != 0)
 804       && (hInstance != 0xffff) )
 805     {
 806         /* calling MPI with a foreign DSEG is invalid ! */
 807         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 808                    hInstance,CURRENT_DS);
 809     }
 810
 811     /* Always use the DSEG that MPI was entered with.
 812      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 813      * as CURRENT_DS provides the DSEG value we need.
 814      * ("calling" DS, *not* "task" DS !) */
 815     hInstanceSelector = CURRENT_DS;
 816     hInstance = GlobalHandle16(hInstanceSelector);
 817
 818     /* no thunking for DLLs */
 819     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 820         return func;
 821
 822     thunkaddr = TASK_AllocThunk();
 823     if (!thunkaddr) return (FARPROC16)0;
 824     thunk = MapSL( thunkaddr );
 825     lfunc = MapSL( (SEGPTR)func );
 826
 827     TRACE("(%08lx,%04x): got thunk %08lx\n",
 828           (DWORD)func, hInstance, (DWORD)thunkaddr );
 829     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 830         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 831     ) {
 832         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 833     }
 834
 835     *thunk++ = 0xb8;    /* movw instance, %ax */
 836     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 837     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 838     *thunk++ = 0xea;    /* ljmp func */
 839     *(DWORD *)thunk = (DWORD)func;
 840     return (FARPROC16)thunkaddr;
 841     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 842 }
 843
 844
 845 /***********************************************************************
 846  *           FreeProcInstance  (KERNEL.52)
 847  */
 848 void WINAPI FreeProcInstance16( FARPROC16 func )
 849 {
 850     TRACE("(%08lx)\n", (DWORD)func );
 851     TASK_FreeThunk( (SEGPTR)func );
 852 }
 853
 854 /**********************************************************************
 855  *          TASK_GetCodeSegment
 856  *
 857  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 858  * and logical segment number of a given code segment.
 859  *
 860  * 'proc' either *is* already a pair of module handle and segment number,
 861  * in which case there's nothing to do.  Otherwise, it is a pointer to
 862  * a function, and we need to retrieve the code segment.  If the pointer
 863  * happens to point to a thunk, we'll retrieve info about the code segment
 864  * where the function pointed to by the thunk resides, not the thunk itself.
 865  *
 866  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 867  *        the function the snoop code will return to ...
 868  *
 869  */
 870 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 871                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 872 {
 873     NE_MODULE *pModule = NULL;
 874     SEGTABLEENTRY *pSeg = NULL;
 875     int segNr=0;
 876
 877     /* Try pair of module handle / segment number */
 878     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 879     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 880     {
 881         segNr = LOWORD( proc );
 882         if ( segNr && segNr <= pModule->seg_count )
 883             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 884     }
 885
 886     /* Try thunk or function */
 887     else
 888     {
 889         BYTE *thunk = MapSL( (SEGPTR)proc );
 890         WORD selector;
 891
 892         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 893             selector = thunk[6] + (thunk[7] << 8);
 894         else
 895             selector = HIWORD( proc );
 896
 897         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 898         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 899
 900         if ( pModule )
 901             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 902                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 903                     break;
 904
 905         if ( pModule && segNr > pModule->seg_count )
 906             pSeg = NULL;
 907     }
 908
 909     /* Abort if segment not found */
 910
 911     if ( !pModule || !pSeg )
 912         return FALSE;
 913
 914     /* Return segment data */
 915
 916     if ( ppModule ) *ppModule = pModule;
 917     if ( ppSeg    ) *ppSeg    = pSeg;
 918     if ( pSegNr   ) *pSegNr   = segNr;
 919
 920     return TRUE;
 921 }
 922
 923 /**********************************************************************
 924  *          GetCodeHandle    (KERNEL.93)
 925  */
 926 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 927 {
 928     SEGTABLEENTRY *pSeg;
 929
 930     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 931         return (HANDLE16)0;
 932
 933     return pSeg->hSeg;
 934 }
 935
 936 /**********************************************************************
 937  *          GetCodeInfo    (KERNEL.104)
 938  */
 939 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 940 {
 941     NE_MODULE *pModule;
 942     SEGTABLEENTRY *pSeg;
 943     int segNr;
 944
 945     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 946         return FALSE;
 947
 948     /* Fill in segment information */
 949
 950     segInfo->offSegment = pSeg->filepos;
 951     segInfo->cbSegment  = pSeg->size;
 952     segInfo->flags      = pSeg->flags;
 953     segInfo->cbAlloc    = pSeg->minsize;
 954     segInfo->h          = pSeg->hSeg;
 955     segInfo->alignShift = pModule->alignment;
 956
 957     if ( segNr == pModule->dgroup )
 958         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 959
 960     /* Return module handle in %es */
 961
 962     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
 963
 964     return TRUE;
 965 }
 966
 967
 968 /**********************************************************************
 969  *          DefineHandleTable    (KERNEL.94)
 970  */
 971 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
 972 {
 973     FIXME("(%04x): stub ?\n", wOffset);
 974     return TRUE;
 975 }
 976
 977
 978 /***********************************************************************
 979  *           SetTaskQueue  (KERNEL.34)
 980  */
 981 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
 982 {
 983     HQUEUE16 hPrev;
 984     TDB *pTask;
 985
 986     if (!hTask) hTask = GetCurrentTask();
 987     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
 988
 989     hPrev = pTask->hQueue;
 990     pTask->hQueue = hQueue;
 991
 992     return hPrev;
 993 }
 994
 995
 996 /***********************************************************************
 997  *           GetTaskQueue  (KERNEL.35)
 998  */
 999 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1000 {
1001     TDB *pTask;
1002
1003     if (!hTask) hTask = GetCurrentTask();
1004     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1005     return pTask->hQueue;
1006 }
1007
1008 /***********************************************************************
1009  *           SetThreadQueue  (KERNEL.463)
1010  */
1011 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1012 {
1013     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1014     HQUEUE16 oldQueue = teb? teb->queue : 0;
1015
1016     if ( teb )
1017     {
1018         teb->queue = hQueue;
1019
1020         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1021             SetTaskQueue16( teb->htask16, hQueue );
1022     }
1023
1024     return oldQueue;
1025 }
1026
1027 /***********************************************************************
1028  *           GetThreadQueue  (KERNEL.464)
1029  */
1030 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1031 {
1032     TEB *teb = NULL;
1033     if ( !thread )
1034         teb = NtCurrentTeb();
1035     else if ( HIWORD(thread) )
1036         teb = THREAD_IdToTEB( thread );
1037     else if ( IsTask16( (HTASK16)thread ) )
1038         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1039
1040     return (HQUEUE16)(teb? teb->queue : 0);
1041 }
1042
1043 /***********************************************************************
1044  *           SetFastQueue  (KERNEL.624)
1045  */
1046 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1047 {
1048     TEB *teb = NULL;
1049     if ( !thread )
1050         teb = NtCurrentTeb();
1051     else if ( HIWORD(thread) )
1052         teb = THREAD_IdToTEB( thread );
1053     else if ( IsTask16( (HTASK16)thread ) )
1054         teb = (TASK_GetPtr( (HANDLE16)thread ))->teb;
1055
1056     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1057 }
1058
1059 /***********************************************************************
1060  *           GetFastQueue  (KERNEL.625)
1061  */
1062 HANDLE WINAPI GetFastQueue16( void )
1063 {
1064     HANDLE ret = (HANDLE)NtCurrentTeb()->queue;
1065
1066     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1067     return ret;
1068 }
1069
1070 /***********************************************************************
1071  *           SwitchStackTo   (KERNEL.108)
1072  */
1073 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1074 {
1075     TDB *pTask;
1076     STACK16FRAME *oldFrame, *newFrame;
1077     INSTANCEDATA *pData;
1078     UINT16 copySize;
1079
1080     if (!(pTask = TASK_GetCurrent())) return;
1081     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1082     TRACE("old=%04x:%04x new=%04x:%04x\n",
1083           SELECTOROF( pTask->teb->cur_stack ),
1084           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1085
1086     /* Save the old stack */
1087
1088     oldFrame = THREAD_STACK16( pTask->teb );
1089     /* pop frame + args and push bp */
1090     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1091                            + 2 * sizeof(WORD);
1092     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1093     pData->stacktop    = top;
1094     pData->stackmin    = ptr;
1095     pData->stackbottom = ptr;
1096
1097     /* Switch to the new stack */
1098
1099     /* Note: we need to take the 3 arguments into account; otherwise,
1100      * the stack will underflow upon return from this function.
1101      */
1102     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1103     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1104     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1105     newFrame = THREAD_STACK16( pTask->teb );
1106
1107     /* Copy the stack frame and the local variables to the new stack */
1108
1109     memmove( newFrame, oldFrame, copySize );
1110     newFrame->bp = ptr;
1111     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1112 }
1113
1114
1115 /***********************************************************************
1116  *           SwitchStackBack   (KERNEL.109)
1117  */
1118 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1119 {
1120     STACK16FRAME *oldFrame, *newFrame;
1121     INSTANCEDATA *pData;
1122
1123     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1124         return;
1125     if (!pData->old_ss_sp)
1126     {
1127         WARN("No previous SwitchStackTo\n" );
1128         return;
1129     }
1130     TRACE("restoring stack %04x:%04x\n",
1131           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1132
1133     oldFrame = CURRENT_STACK16;
1134
1135     /* Pop bp from the previous stack */
1136
1137     BP_reg(context) = *(WORD *)MapSL(pData->old_ss_sp);
1138     pData->old_ss_sp += sizeof(WORD);
1139
1140     /* Switch back to the old stack */
1141
1142     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1143     context->SegSs = SELECTOROF(pData->old_ss_sp);
1144     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1145     pData->old_ss_sp = 0;
1146
1147     /* Build a stack frame for the return */
1148
1149     newFrame = CURRENT_STACK16;
1150     newFrame->frame32     = oldFrame->frame32;
1151     newFrame->module_cs   = oldFrame->module_cs;
1152     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1153     newFrame->entry_ip    = oldFrame->entry_ip;
1154 }
1155
1156
1157 /***********************************************************************
1158  *           GetTaskQueueDS  (KERNEL.118)
1159  */
1160 void WINAPI GetTaskQueueDS16(void)
1161 {
1162     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1163 }
1164
1165
1166 /***********************************************************************
1167  *           GetTaskQueueES  (KERNEL.119)
1168  */
1169 void WINAPI GetTaskQueueES16(void)
1170 {
1171     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1172 }
1173
1174
1175 /***********************************************************************
1176  *           GetCurrentTask   (KERNEL32.@)
1177  */
1178 HTASK16 WINAPI GetCurrentTask(void)
1179 {
1180     return NtCurrentTeb()->htask16;
1181 }
1182
1183 /***********************************************************************
1184  *           GetCurrentTask   (KERNEL.36)
1185  */
1186 DWORD WINAPI WIN16_GetCurrentTask(void)
1187 {
1188     /* This is the version used by relay code; the first task is */
1189     /* returned in the high word of the result */
1190     return MAKELONG( GetCurrentTask(), hFirstTask );
1191 }
1192
1193
1194 /***********************************************************************
1195  *           GetCurrentPDB   (KERNEL.37)
1196  *
1197  * UNDOC: returns PSP of KERNEL in high word
1198  */
1199 DWORD WINAPI GetCurrentPDB16(void)
1200 {
1201     TDB *pTask;
1202
1203     if (!(pTask = TASK_GetCurrent())) return 0;
1204     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1205 }
1206
1207
1208 /***********************************************************************
1209  *           GetCurPID   (KERNEL.157)
1210  */
1211 DWORD WINAPI GetCurPID16( DWORD unused )
1212 {
1213     return 0;
1214 }
1215
1216
1217 /***********************************************************************
1218  *           GetInstanceData   (KERNEL.54)
1219  */
1220 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1221 {
1222     char *ptr = (char *)GlobalLock16( instance );
1223     if (!ptr || !len) return 0;
1224     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1225     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1226     return len;
1227 }
1228
1229
1230 /***********************************************************************
1231  *           GetExeVersion   (KERNEL.105)
1232  */
1233 WORD WINAPI GetExeVersion16(void)
1234 {
1235     TDB *pTask;
1236
1237     if (!(pTask = TASK_GetCurrent())) return 0;
1238     return pTask->version;
1239 }
1240
1241
1242 /***********************************************************************
1243  *           SetErrorMode   (KERNEL.107)
1244  */
1245 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1246 {
1247     TDB *pTask;
1248     if (!(pTask = TASK_GetCurrent())) return 0;
1249     pTask->error_mode = mode;
1250     return SetErrorMode( mode );
1251 }
1252
1253
1254 /***********************************************************************
1255  *           GetNumTasks   (KERNEL.152)
1256  */
1257 UINT16 WINAPI GetNumTasks16(void)
1258 {
1259     return nTaskCount;
1260 }
1261
1262
1263 /***********************************************************************
1264  *           GetTaskDS   (KERNEL.155)
1265  *
1266  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1267  * I don't think we need to bother with this.
1268  */
1269 HINSTANCE16 WINAPI GetTaskDS16(void)
1270 {
1271     TDB *pTask;
1272
1273     if (!(pTask = TASK_GetCurrent())) return 0;
1274     return GlobalHandleToSel16(pTask->hInstance);
1275 }
1276
1277 /***********************************************************************
1278  *           GetDummyModuleHandleDS   (KERNEL.602)
1279  */
1280 WORD WINAPI GetDummyModuleHandleDS16(void)
1281 {
1282     TDB *pTask;
1283     WORD selector;
1284
1285     if (!(pTask = TASK_GetCurrent())) return 0;
1286     if (!(pTask->flags & TDBF_WIN32)) return 0;
1287     selector = GlobalHandleToSel16( pTask->hModule );
1288     CURRENT_DS = selector;
1289     return selector;
1290 }
1291
1292 /***********************************************************************
1293  *           IsTask   (KERNEL.320)
1294  *           IsTask16 (KERNEL32.@)
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 }