loader/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <assert.h>
  10 #include <unistd.h>
  11
  12 #include "wine/port.h"
  13 #include "wine/winbase16.h"
  14 #include "ntddk.h"
  15 #include "callback.h"
  16 #include "drive.h"
  17 #include "file.h"
  18 #include "global.h"
  19 #include "instance.h"
  20 #include "miscemu.h"
  21 #include "module.h"
  22 #include "queue.h"
  23 #include "selectors.h"
  24 #include "stackframe.h"
  25 #include "task.h"
  26 #include "thread.h"
  27 #include "toolhelp.h"
  28 #include "winnt.h"
  29 #include "syslevel.h"
  30 #include "winsock.h"
  31 #include "debugtools.h"
  32 #include "services.h"
  33 #include "server.h"
  34
  35
  36 DEFAULT_DEBUG_CHANNEL(task);
  37 DECLARE_DEBUG_CHANNEL(relay);
  38 DECLARE_DEBUG_CHANNEL(toolhelp);
  39
  40   /* Min. number of thunks allocated when creating a new segment */
  41 #define MIN_THUNKS  32
  42
  43
  44 static THHOOK DefaultThhook;
  45 THHOOK *pThhook = &DefaultThhook;
  46
  47 #define hCurrentTask (pThhook->CurTDB)
  48 #define hFirstTask   (pThhook->HeadTDB)
  49 #define hLockedTask  (pThhook->LockTDB)
  50
  51 static UINT16 nTaskCount = 0;
  52
  53 static HTASK initial_task;
  54
  55 /***********************************************************************
  56  *           TASK_InstallTHHook
  57  */
  58 void TASK_InstallTHHook( THHOOK *pNewThhook )
  59 {
  60      THHOOK *pOldThhook = pThhook;
  61
  62      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  63
  64      *pThhook = *pOldThhook;
  65 }
  66
  67 /***********************************************************************
  68  *           TASK_GetNextTask
  69  */
  70 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  71 {
  72     TDB* pTask = (TDB*)GlobalLock16(hTask);
  73
  74     if (pTask->hNext) return pTask->hNext;
  75     return (hFirstTask != hTask) ? hFirstTask : 0;
  76 }
  77
  78 /***********************************************************************
  79  *           TASK_LinkTask
  80  */
  81 static void TASK_LinkTask( HTASK16 hTask )
  82 {
  83     HTASK16 *prevTask;
  84     TDB *pTask;
  85
  86     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
  87     prevTask = &hFirstTask;
  88     while (*prevTask)
  89     {
  90         TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask );
  91         if (prevTaskPtr->priority >= pTask->priority) break;
  92         prevTask = &prevTaskPtr->hNext;
  93     }
  94     pTask->hNext = *prevTask;
  95     *prevTask = hTask;
  96     nTaskCount++;
  97 }
  98
  99
 100 /***********************************************************************
 101  *           TASK_UnlinkTask
 102  */
 103 static void TASK_UnlinkTask( HTASK16 hTask )
 104 {
 105     HTASK16 *prevTask;
 106     TDB *pTask;
 107
 108     prevTask = &hFirstTask;
 109     while (*prevTask && (*prevTask != hTask))
 110     {
 111         pTask = (TDB *)GlobalLock16( *prevTask );
 112         prevTask = &pTask->hNext;
 113     }
 114     if (*prevTask)
 115     {
 116         pTask = (TDB *)GlobalLock16( *prevTask );
 117         *prevTask = pTask->hNext;
 118         pTask->hNext = 0;
 119         nTaskCount--;
 120     }
 121 }
 122
 123
 124 /***********************************************************************
 125  *           TASK_CreateThunks
 126  *
 127  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 128  * and containing 'count' entries.
 129  */
 130 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 131 {
 132     int i;
 133     WORD free;
 134     THUNKS *pThunk;
 135
 136     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 137     pThunk->next = 0;
 138     pThunk->magic = THUNK_MAGIC;
 139     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 140     free = pThunk->free;
 141     for (i = 0; i < count-1; i++)
 142     {
 143         free += 8;  /* Offset of next thunk */
 144         pThunk->thunks[4*i] = free;
 145     }
 146     pThunk->thunks[4*i] = 0;  /* Last thunk */
 147 }
 148
 149
 150 /***********************************************************************
 151  *           TASK_AllocThunk
 152  *
 153  * Allocate a thunk for MakeProcInstance().
 154  */
 155 static SEGPTR TASK_AllocThunk( HTASK16 hTask )
 156 {
 157     TDB *pTask;
 158     THUNKS *pThunk;
 159     WORD sel, base;
 160
 161     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 162     sel = pTask->hCSAlias;
 163     pThunk = &pTask->thunks;
 164     base = (int)pThunk - (int)pTask;
 165     while (!pThunk->free)
 166     {
 167         sel = pThunk->next;
 168         if (!sel)  /* Allocate a new segment */
 169         {
 170             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 171                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 172             if (!sel) return (SEGPTR)0;
 173             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 174             pThunk->next = sel;
 175         }
 176         pThunk = (THUNKS *)GlobalLock16( sel );
 177         base = 0;
 178     }
 179     base += pThunk->free;
 180     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 181     return MAKESEGPTR( sel, base );
 182 }
 183
 184
 185 /***********************************************************************
 186  *           TASK_FreeThunk
 187  *
 188  * Free a MakeProcInstance() thunk.
 189  */
 190 static BOOL TASK_FreeThunk( HTASK16 hTask, SEGPTR thunk )
 191 {
 192     TDB *pTask;
 193     THUNKS *pThunk;
 194     WORD sel, base;
 195
 196     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 197     sel = pTask->hCSAlias;
 198     pThunk = &pTask->thunks;
 199     base = (int)pThunk - (int)pTask;
 200     while (sel && (sel != HIWORD(thunk)))
 201     {
 202         sel = pThunk->next;
 203         pThunk = (THUNKS *)GlobalLock16( sel );
 204         base = 0;
 205     }
 206     if (!sel) return FALSE;
 207     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 208     pThunk->free = LOWORD(thunk) - base;
 209     return TRUE;
 210 }
 211
 212
 213 /***********************************************************************
 214  *           TASK_Create
 215  *
 216  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 217  *       to be careful to protect global data structures. We do this
 218  *       by entering the Win16Lock while linking the task into the
 219  *       global task list.
 220  */
 221 BOOL TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, TEB *teb, LPCSTR cmdline, BYTE len )
 222 {
 223     HTASK16 hTask;
 224     TDB *pTask;
 225     char name[10];
 226
 227       /* Allocate the task structure */
 228
 229     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 230     if (!hTask) return FALSE;
 231     pTask = (TDB *)GlobalLock16( hTask );
 232     FarSetOwner16( hTask, pModule->self );
 233
 234     /* Fill the task structure */
 235
 236     pTask->hSelf = hTask;
 237
 238     if (teb->tibflags & TEBF_WIN32)
 239     {
 240         pTask->flags        |= TDBF_WIN32;
 241         pTask->hInstance     = pModule->self;
 242         pTask->hPrevInstance = 0;
 243         /* NOTE: for 16-bit tasks, the instance handles are updated later on
 244            in NE_InitProcess */
 245     }
 246
 247     pTask->version       = pModule->expected_version;
 248     pTask->hModule       = pModule->self;
 249     pTask->hParent       = GetCurrentTask();
 250     pTask->magic         = TDB_MAGIC;
 251     pTask->nCmdShow      = cmdShow;
 252     pTask->teb           = teb;
 253     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 254     strcpy( pTask->curdir, "\\" );
 255     lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 256                  sizeof(pTask->curdir) - 1 );
 257
 258       /* Create the thunks block */
 259
 260     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 261
 262       /* Copy the module name */
 263
 264     GetModuleName16( pModule->self, name, sizeof(name) );
 265     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 266
 267       /* Allocate a selector for the PDB */
 268
 269     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 270                                       pModule->self, WINE_LDT_FLAGS_DATA );
 271
 272       /* Fill the PDB */
 273
 274     pTask->pdb.int20 = 0x20cd;
 275     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 276     PUT_UA_DWORD(&pTask->pdb.dispatcher[1],
 277                  (DWORD)GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" ));
 278     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 279     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 280     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 281     pTask->pdb.fileHandlesPtr =
 282         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 283     pTask->pdb.hFileHandles = 0;
 284     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 285     /* FIXME: should we make a copy of the environment? */
 286     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 287     pTask->pdb.nbFiles        = 20;
 288
 289     /* Fill the command line */
 290
 291     if (!cmdline)
 292     {
 293         cmdline = GetCommandLineA();
 294         /* remove the first word (program name) */
 295         if (*cmdline == '"')
 296             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 297         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 298         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 299         len = strlen(cmdline);
 300     }
 301     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 302     pTask->pdb.cmdLine[0] = len;
 303     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 304     /* pTask->pdb.cmdLine[len+1] = 0; */
 305
 306     TRACE("module='%s' cmdline='%.*s' task=%04x\n", name, len, cmdline, hTask );
 307
 308       /* Get the compatibility flags */
 309
 310     pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 311
 312       /* Allocate a code segment alias for the TDB */
 313
 314     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 315                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 316
 317       /* Default DTA overwrites command line */
 318
 319     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 320
 321     /* Create scheduler event for 16-bit tasks */
 322
 323     if ( !(pTask->flags & TDBF_WIN32) )
 324         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 325
 326     /* Enter task handle into thread and process */
 327
 328     teb->htask16 = hTask;
 329     if (!initial_task) initial_task = hTask;
 330
 331     /* Add the task to the linked list */
 332
 333     _EnterWin16Lock();
 334     TASK_LinkTask( hTask );
 335     _LeaveWin16Lock();
 336
 337     return TRUE;
 338 }
 339
 340 /***********************************************************************
 341  *           TASK_DeleteTask
 342  */
 343 static void TASK_DeleteTask( HTASK16 hTask )
 344 {
 345     TDB *pTask;
 346     HGLOBAL16 hPDB;
 347
 348     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 349     hPDB = pTask->hPDB;
 350
 351     pTask->magic = 0xdead; /* invalidate signature */
 352
 353     /* Free the selector aliases */
 354
 355     GLOBAL_FreeBlock( pTask->hCSAlias );
 356     GLOBAL_FreeBlock( pTask->hPDB );
 357
 358     /* Free the task module */
 359
 360     FreeModule16( pTask->hModule );
 361
 362     /* Free the task structure itself */
 363
 364     GlobalFree16( hTask );
 365
 366     /* Free all memory used by this task (including the 32-bit stack, */
 367     /* the environment block and the thunk segments). */
 368
 369     GlobalFreeAll16( hPDB );
 370 }
 371
 372 /***********************************************************************
 373  *           TASK_KillTask
 374  */
 375 void TASK_ExitTask(void)
 376 {
 377     TDB *pTask;
 378     DWORD lockCount;
 379
 380     /* Enter the Win16Lock to protect global data structures */
 381     _EnterWin16Lock();
 382
 383     pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 384     if ( !pTask )
 385     {
 386         _LeaveWin16Lock();
 387         return;
 388     }
 389
 390     TRACE("Killing task %04x\n", pTask->hSelf );
 391
 392     /* Perform USER cleanup */
 393
 394     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 395     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 396     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 397     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 398
 399     /* Remove the task from the list to be sure we never switch back to it */
 400     TASK_UnlinkTask( pTask->hSelf );
 401
 402     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 403     {
 404         TRACE("this is the last task, exiting\n" );
 405         ExitKernel16();
 406     }
 407
 408     if( nTaskCount )
 409     {
 410         TDB* p = (TDB *)GlobalLock16( hFirstTask );
 411         while( p )
 412         {
 413             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 414             p = (TDB *)GlobalLock16( p->hNext );
 415         }
 416     }
 417
 418     pTask->nEvents = 0;
 419
 420     if ( hLockedTask == pTask->hSelf )
 421         hLockedTask = 0;
 422
 423     TASK_DeleteTask( pTask->hSelf );
 424
 425     /* ... schedule another one ... */
 426     TASK_Reschedule();
 427
 428     /* ... and completely release the Win16Lock, just in case. */
 429     ReleaseThunkLock( &lockCount );
 430 }
 431
 432 /***********************************************************************
 433  *           TASK_Reschedule
 434  *
 435  * This is where all the magic of task-switching happens!
 436  *
 437  * 16-bit Windows performs non-preemptive (cooperative) multitasking.
 438  * This means that each 16-bit task runs until it voluntarily yields
 439  * control, at which point the scheduler gets active and selects the
 440  * next task to run.
 441  *
 442  * In Wine, all processes, even 16-bit ones, are scheduled preemptively
 443  * by the standard scheduler of the underlying OS.  As many 16-bit apps
 444  * *rely* on the behaviour of the Windows scheduler, however, we have
 445  * to simulate that behaviour.
 446  *
 447  * This is achieved as follows: every 16-bit task is at time (except
 448  * during task creation and deletion) in one of two states: either it
 449  * is the one currently running, then the global variable hCurrentTask
 450  * contains its task handle, or it is not currently running, then it
 451  * is blocked on a special scheduler event, a global handle which
 452  * is stored in the task struct.
 453  *
 454  * When the current task yields control, this routine gets called. Its
 455  * purpose is to determine the next task to be active, signal the
 456  * scheduler event of that task, and then put the current task to sleep
 457  * waiting for *its* scheduler event to get signalled again.
 458  *
 459  * This routine can get called in a few other special situations as well:
 460  *
 461  * - On creation of a 16-bit task, the Unix process executing the task
 462  *   calls TASK_Reschedule once it has completed its initialization.
 463  *   At this point, the task needs to be blocked until its scheduler
 464  *   event is signalled the first time (this will be done by the parent
 465  *   process to get the task up and running).
 466  *
 467  * - When the task currently running terminates itself, this routine gets
 468  *   called and has to schedule another task, *without* blocking the
 469  *   terminating task.
 470  *
 471  * - When a 32-bit thread posts an event for a 16-bit task, it might be
 472  *   the case that *no* 16-bit task is currently running.  In this case
 473  *   the task that has now an event pending is to be scheduled.
 474  *
 475  */
 476 void TASK_Reschedule(void)
 477 {
 478     TDB *pOldTask = NULL, *pNewTask = NULL;
 479     HTASK16 hOldTask = 0, hNewTask = 0;
 480     enum { MODE_YIELD, MODE_SLEEP, MODE_WAKEUP } mode;
 481     DWORD lockCount;
 482
 483     _EnterWin16Lock();
 484
 485     /* Check what we need to do */
 486     hOldTask = GetCurrentTask();
 487     pOldTask = (TDB *)GlobalLock16( hOldTask );
 488     TRACE( "entered with hCurrentTask %04x by hTask %04x (pid %ld)\n",
 489            hCurrentTask, hOldTask, (long) getpid() );
 490
 491     if ( pOldTask && THREAD_IsWin16( NtCurrentTeb() ) )
 492     {
 493         /* We are called by an active (non-deleted) 16-bit task */
 494
 495         /* If we don't even have a current task, or else the current
 496            task has yielded, we'll need to schedule a new task and
 497            (possibly) put the calling task to sleep.  Otherwise, we
 498            only block the caller. */
 499
 500         if ( !hCurrentTask || hCurrentTask == hOldTask )
 501             mode = MODE_YIELD;
 502         else
 503             mode = MODE_SLEEP;
 504     }
 505     else
 506     {
 507         /* We are called by a deleted 16-bit task or a 32-bit thread */
 508
 509         /* The only situation where we need to do something is if we
 510            now do not have a current task.  Then, we'll need to wake up
 511            some task that has events pending. */
 512
 513         if ( !hCurrentTask || hCurrentTask == hOldTask )
 514             mode = MODE_WAKEUP;
 515         else
 516         {
 517             /* nothing to do */
 518             _LeaveWin16Lock();
 519             return;
 520         }
 521     }
 522
 523     /* Find a task to yield to: check for DirectedYield() */
 524     if ( mode == MODE_YIELD && pOldTask && pOldTask->hYieldTo )
 525     {
 526         hNewTask = pOldTask->hYieldTo;
 527         pNewTask = (TDB *)GlobalLock16( hNewTask );
 528         if( !pNewTask || !pNewTask->nEvents) hNewTask = 0;
 529         pOldTask->hYieldTo = 0;
 530     }
 531
 532     /* Find a task to yield to: check for pending events */
 533     if ( (mode == MODE_YIELD || mode == MODE_WAKEUP) && !hNewTask )
 534     {
 535         hNewTask = hFirstTask;
 536         while (hNewTask)
 537         {
 538             pNewTask = (TDB *)GlobalLock16( hNewTask );
 539
 540             TRACE( "\ttask = %04x, events = %i\n", hNewTask, pNewTask->nEvents );
 541
 542             if (pNewTask->nEvents) break;
 543             hNewTask = pNewTask->hNext;
 544         }
 545         if (hLockedTask && (hNewTask != hLockedTask)) hNewTask = 0;
 546     }
 547
 548     /* If we are still the task with highest priority, just return ... */
 549     if ( mode == MODE_YIELD && hNewTask && hNewTask == hCurrentTask )
 550     {
 551         TRACE("returning to the current task (%04x)\n", hCurrentTask );
 552         _LeaveWin16Lock();
 553
 554         /* Allow Win32 threads to thunk down even while a Win16 task is
 555            in a tight PeekMessage() or Yield() loop ... */
 556         ReleaseThunkLock( &lockCount );
 557         RestoreThunkLock( lockCount );
 558         return;
 559     }
 560
 561     /* If no task to yield to found, suspend 16-bit scheduler ... */
 562     if ( mode == MODE_YIELD && !hNewTask )
 563     {
 564         TRACE("No currently active task\n");
 565         hCurrentTask = 0;
 566     }
 567
 568     /* If we found a task to wake up, do it ... */
 569     if ( (mode == MODE_YIELD || mode == MODE_WAKEUP) && hNewTask )
 570     {
 571         TRACE("Switching to task %04x (%.8s)\n",
 572                       hNewTask, pNewTask->module_name );
 573
 574         pNewTask->priority++;
 575         TASK_UnlinkTask( hNewTask );
 576         TASK_LinkTask( hNewTask );
 577         pNewTask->priority--;
 578
 579         hCurrentTask = hNewTask;
 580         NtSetEvent( pNewTask->hEvent, NULL );
 581
 582         /* This is set just in case some app reads it ... */
 583         pNewTask->ss_sp = pNewTask->teb->cur_stack;
 584     }
 585
 586     /* If we need to put the current task to sleep, do it ... */
 587     if ( (mode == MODE_YIELD || mode == MODE_SLEEP) && hOldTask != hCurrentTask )
 588     {
 589         NtResetEvent( pOldTask->hEvent, NULL );
 590
 591         ReleaseThunkLock( &lockCount );
 592         SYSLEVEL_CheckNotLevel( 1 );
 593         WaitForSingleObject( pOldTask->hEvent, INFINITE );
 594         RestoreThunkLock( lockCount );
 595     }
 596
 597     _LeaveWin16Lock();
 598 }
 599
 600 /***********************************************************************
 601  *           InitTask  (KERNEL.91)
 602  *
 603  * Called by the application startup code.
 604  */
 605 void WINAPI InitTask16( CONTEXT86 *context )
 606 {
 607     TDB *pTask;
 608     INSTANCEDATA *pinstance;
 609     SEGPTR ptr;
 610
 611     context->Eax = 0;
 612     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
 613
 614     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 615        as some apps, notably Visual Basic apps, *modify* the heap/stack
 616        size of the instance data segment before calling InitTask() */
 617
 618     /* Initialize the INSTANCEDATA structure */
 619     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 620     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 621     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 622     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 623                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 624
 625     /* Initialize the local heap */
 626     if (LOWORD(context->Ecx))
 627         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 628
 629     /* Initialize implicitly loaded DLLs */
 630     NE_InitializeDLLs( pTask->hModule );
 631     NE_DllProcessAttach( pTask->hModule );
 632
 633     /* Registers on return are:
 634      * ax     1 if OK, 0 on error
 635      * cx     stack limit in bytes
 636      * dx     cmdShow parameter
 637      * si     instance handle of the previous instance
 638      * di     instance handle of the new task
 639      * es:bx  pointer to command line inside PSP
 640      *
 641      * 0 (=%bp) is pushed on the stack
 642      */
 643     ptr = stack16_push( sizeof(WORD) );
 644     *(WORD *)MapSL(ptr) = 0;
 645     context->Esp -= 2;
 646
 647     context->Eax = 1;
 648
 649     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 650     else
 651     {
 652         LPBYTE p = &pTask->pdb.cmdLine[1];
 653         while ((*p == ' ') || (*p == '\t')) p++;
 654         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 655     }
 656     context->Ecx   = pinstance->stacktop;
 657     context->Edx   = pTask->nCmdShow;
 658     context->Esi   = (DWORD)pTask->hPrevInstance;
 659     context->Edi   = (DWORD)pTask->hInstance;
 660     context->SegEs = (WORD)pTask->hPDB;
 661 }
 662
 663
 664 /***********************************************************************
 665  *           WaitEvent  (KERNEL.30)
 666  */
 667 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 668 {
 669     TDB *pTask;
 670
 671     if (!hTask) hTask = GetCurrentTask();
 672     pTask = (TDB *)GlobalLock16( hTask );
 673
 674     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 675     {
 676         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 677         return TRUE;
 678     }
 679
 680     if (pTask->nEvents > 0)
 681     {
 682         pTask->nEvents--;
 683         return FALSE;
 684     }
 685     TASK_Reschedule();
 686
 687     /* When we get back here, we have an event */
 688
 689     if (pTask->nEvents > 0) pTask->nEvents--;
 690     return TRUE;
 691 }
 692
 693
 694 /***********************************************************************
 695  *           PostEvent  (KERNEL.31)
 696  */
 697 void WINAPI PostEvent16( HTASK16 hTask )
 698 {
 699     TDB *pTask;
 700
 701     if (!hTask) hTask = GetCurrentTask();
 702     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 703
 704     if ( !THREAD_IsWin16( pTask->teb ) )
 705     {
 706         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 707         return;
 708     }
 709
 710     pTask->nEvents++;
 711
 712     /* If we are a 32-bit task, we might need to wake up the 16-bit scheduler */
 713     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 714         TASK_Reschedule();
 715 }
 716
 717
 718 /***********************************************************************
 719  *           SetPriority  (KERNEL.32)
 720  */
 721 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 722 {
 723     TDB *pTask;
 724     INT16 newpriority;
 725
 726     if (!hTask) hTask = GetCurrentTask();
 727     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 728     newpriority = pTask->priority + delta;
 729     if (newpriority < -32) newpriority = -32;
 730     else if (newpriority > 15) newpriority = 15;
 731
 732     pTask->priority = newpriority + 1;
 733     TASK_UnlinkTask( hTask );
 734     TASK_LinkTask( hTask );
 735     pTask->priority--;
 736 }
 737
 738
 739 /***********************************************************************
 740  *           LockCurrentTask  (KERNEL.33)
 741  */
 742 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 743 {
 744     if (bLock) hLockedTask = GetCurrentTask();
 745     else hLockedTask = 0;
 746     return hLockedTask;
 747 }
 748
 749
 750 /***********************************************************************
 751  *           IsTaskLocked  (KERNEL.122)
 752  */
 753 HTASK16 WINAPI IsTaskLocked16(void)
 754 {
 755     return hLockedTask;
 756 }
 757
 758
 759 /***********************************************************************
 760  *           OldYield  (KERNEL.117)
 761  */
 762 void WINAPI OldYield16(void)
 763 {
 764     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
 765
 766     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 767     {
 768         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 769         return;
 770     }
 771
 772     if (pCurTask) pCurTask->nEvents++;  /* Make sure we get back here */
 773     TASK_Reschedule();
 774     if (pCurTask) pCurTask->nEvents--;
 775 }
 776
 777 /***********************************************************************
 778  *           WIN32_OldYield16  (KERNEL.447)
 779  */
 780 void WINAPI WIN32_OldYield16(void)
 781 {
 782    DWORD count;
 783
 784    ReleaseThunkLock(&count);
 785    RestoreThunkLock(count);
 786 }
 787
 788 /***********************************************************************
 789  *           DirectedYield  (KERNEL.150)
 790  */
 791 void WINAPI DirectedYield16( HTASK16 hTask )
 792 {
 793     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
 794
 795     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 796     {
 797         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 798         return;
 799     }
 800
 801     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 802
 803     pCurTask->hYieldTo = hTask;
 804     OldYield16();
 805
 806     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 807 }
 808
 809 /***********************************************************************
 810  *           Yield16  (KERNEL.29)
 811  */
 812 void WINAPI Yield16(void)
 813 {
 814     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
 815
 816     if (pCurTask) pCurTask->hYieldTo = 0;
 817     if (pCurTask && pCurTask->hQueue && Callout.UserYield16) Callout.UserYield16();
 818     else OldYield16();
 819 }
 820
 821 /***********************************************************************
 822  *           KERNEL_490  (KERNEL.490)
 823  */
 824 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 825 {
 826     if ( !someTask ) return 0;
 827
 828     FIXME("(%04x): stub\n", someTask );
 829     return 0;
 830 }
 831
 832 /***********************************************************************
 833  *           MakeProcInstance16  (KERNEL.51)
 834  */
 835 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 836 {
 837     BYTE *thunk,*lfunc;
 838     SEGPTR thunkaddr;
 839     WORD hInstanceSelector;
 840
 841     hInstanceSelector = GlobalHandleToSel16(hInstance);
 842
 843     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 844
 845     if (!HIWORD(func)) {
 846       /* Win95 actually protects via SEH, but this is better for debugging */
 847       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 848       return (FARPROC16)0;
 849     }
 850
 851     if (hInstance)
 852     {
 853         if ( (!(hInstance & 4)) ||
 854              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 855         {
 856             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 857                 hInstance);
 858             return 0;
 859         }
 860     }
 861
 862     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 863       && (hInstance != 0)
 864       && (hInstance != 0xffff) )
 865     {
 866         /* calling MPI with a foreign DSEG is invalid ! */
 867         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 868                    hInstance,CURRENT_DS);
 869     }
 870
 871     /* Always use the DSEG that MPI was entered with.
 872      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 873      * as CURRENT_DS provides the DSEG value we need.
 874      * ("calling" DS, *not* "task" DS !) */
 875     hInstanceSelector = CURRENT_DS;
 876     hInstance = GlobalHandle16(hInstanceSelector);
 877
 878     /* no thunking for DLLs */
 879     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 880         return func;
 881
 882     thunkaddr = TASK_AllocThunk( GetCurrentTask() );
 883     if (!thunkaddr) return (FARPROC16)0;
 884     thunk = MapSL( thunkaddr );
 885     lfunc = MapSL( (SEGPTR)func );
 886
 887     TRACE("(%08lx,%04x): got thunk %08lx\n",
 888           (DWORD)func, hInstance, (DWORD)thunkaddr );
 889     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 890         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 891     ) {
 892         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 893     }
 894
 895     *thunk++ = 0xb8;    /* movw instance, %ax */
 896     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 897     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 898     *thunk++ = 0xea;    /* ljmp func */
 899     *(DWORD *)thunk = (DWORD)func;
 900     return (FARPROC16)thunkaddr;
 901     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 902 }
 903
 904
 905 /***********************************************************************
 906  *           FreeProcInstance16  (KERNEL.52)
 907  */
 908 void WINAPI FreeProcInstance16( FARPROC16 func )
 909 {
 910     TRACE("(%08lx)\n", (DWORD)func );
 911     TASK_FreeThunk( GetCurrentTask(), (SEGPTR)func );
 912 }
 913
 914 /**********************************************************************
 915  *          TASK_GetCodeSegment
 916  *
 917  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 918  * and logical segment number of a given code segment.
 919  *
 920  * 'proc' either *is* already a pair of module handle and segment number,
 921  * in which case there's nothing to do.  Otherwise, it is a pointer to
 922  * a function, and we need to retrieve the code segment.  If the pointer
 923  * happens to point to a thunk, we'll retrieve info about the code segment
 924  * where the function pointed to by the thunk resides, not the thunk itself.
 925  *
 926  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 927  *        the function the snoop code will return to ...
 928  *
 929  */
 930 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 931                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 932 {
 933     NE_MODULE *pModule = NULL;
 934     SEGTABLEENTRY *pSeg = NULL;
 935     int segNr=0;
 936
 937     /* Try pair of module handle / segment number */
 938     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 939     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 940     {
 941         segNr = LOWORD( proc );
 942         if ( segNr && segNr <= pModule->seg_count )
 943             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 944     }
 945
 946     /* Try thunk or function */
 947     else
 948     {
 949         BYTE *thunk = MapSL( (SEGPTR)proc );
 950         WORD selector;
 951
 952         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 953             selector = thunk[6] + (thunk[7] << 8);
 954         else
 955             selector = HIWORD( proc );
 956
 957         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 958         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 959
 960         if ( pModule )
 961             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 962                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 963                     break;
 964
 965         if ( pModule && segNr > pModule->seg_count )
 966             pSeg = NULL;
 967     }
 968
 969     /* Abort if segment not found */
 970
 971     if ( !pModule || !pSeg )
 972         return FALSE;
 973
 974     /* Return segment data */
 975
 976     if ( ppModule ) *ppModule = pModule;
 977     if ( ppSeg    ) *ppSeg    = pSeg;
 978     if ( pSegNr   ) *pSegNr   = segNr;
 979
 980     return TRUE;
 981 }
 982
 983 /**********************************************************************
 984  *          GetCodeHandle    (KERNEL.93)
 985  */
 986 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 987 {
 988     SEGTABLEENTRY *pSeg;
 989
 990     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 991         return (HANDLE16)0;
 992
 993     return pSeg->hSeg;
 994 }
 995
 996 /**********************************************************************
 997  *          GetCodeInfo    (KERNEL.104)
 998  */
 999 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
1000 {
1001     NE_MODULE *pModule;
1002     SEGTABLEENTRY *pSeg;
1003     int segNr;
1004
1005     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1006         return FALSE;
1007
1008     /* Fill in segment information */
1009
1010     segInfo->offSegment = pSeg->filepos;
1011     segInfo->cbSegment  = pSeg->size;
1012     segInfo->flags      = pSeg->flags;
1013     segInfo->cbAlloc    = pSeg->minsize;
1014     segInfo->h          = pSeg->hSeg;
1015     segInfo->alignShift = pModule->alignment;
1016
1017     if ( segNr == pModule->dgroup )
1018         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
1019
1020     /* Return module handle in %es */
1021
1022     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1023
1024     return TRUE;
1025 }
1026
1027
1028 /**********************************************************************
1029  *          DefineHandleTable16    (KERNEL.94)
1030  */
1031 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1032 {
1033     FIXME("(%04x): stub ?\n", wOffset);
1034     return TRUE;
1035 }
1036
1037
1038 /***********************************************************************
1039  *           SetTaskQueue  (KERNEL.34)
1040  */
1041 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1042 {
1043     HQUEUE16 hPrev;
1044     TDB *pTask;
1045
1046     if (!hTask) hTask = GetCurrentTask();
1047     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1048
1049     hPrev = pTask->hQueue;
1050     pTask->hQueue = hQueue;
1051
1052     return hPrev;
1053 }
1054
1055
1056 /***********************************************************************
1057  *           GetTaskQueue  (KERNEL.35)
1058  */
1059 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1060 {
1061     TDB *pTask;
1062
1063     if (!hTask) hTask = GetCurrentTask();
1064     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1065     return pTask->hQueue;
1066 }
1067
1068 /***********************************************************************
1069  *           SetThreadQueue  (KERNEL.463)
1070  */
1071 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1072 {
1073     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1074     HQUEUE16 oldQueue = teb? teb->queue : 0;
1075
1076     if ( teb )
1077     {
1078         teb->queue = hQueue;
1079
1080         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1081             SetTaskQueue16( teb->htask16, hQueue );
1082     }
1083
1084     return oldQueue;
1085 }
1086
1087 /***********************************************************************
1088  *           GetThreadQueue  (KERNEL.464)
1089  */
1090 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1091 {
1092     TEB *teb = NULL;
1093     if ( !thread )
1094         teb = NtCurrentTeb();
1095     else if ( HIWORD(thread) )
1096         teb = THREAD_IdToTEB( thread );
1097     else if ( IsTask16( (HTASK16)thread ) )
1098         teb = ((TDB *)GlobalLock16( (HANDLE16)thread ))->teb;
1099
1100     return (HQUEUE16)(teb? teb->queue : 0);
1101 }
1102
1103 /***********************************************************************
1104  *           SetFastQueue  (KERNEL.624)
1105  */
1106 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1107 {
1108     TEB *teb = NULL;
1109     if ( !thread )
1110         teb = NtCurrentTeb();
1111     else if ( HIWORD(thread) )
1112         teb = THREAD_IdToTEB( thread );
1113     else if ( IsTask16( (HTASK16)thread ) )
1114         teb = ((TDB *)GlobalLock16( (HANDLE16)thread ))->teb;
1115
1116     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1117 }
1118
1119 /***********************************************************************
1120  *           GetFastQueue  (KERNEL.625)
1121  */
1122 HANDLE WINAPI GetFastQueue16( void )
1123 {
1124     TEB *teb = NtCurrentTeb();
1125     if (!teb) return 0;
1126
1127     if (!teb->queue && Callout.InitThreadInput16)
1128         Callout.InitThreadInput16( 0, THREAD_IsWin16(teb)? 4 : 5 );
1129
1130     if (!teb->queue)
1131         FIXME("(): should initialize thread-local queue, expect failure!\n" );
1132
1133     return (HANDLE)teb->queue;
1134 }
1135
1136 /***********************************************************************
1137  *           SwitchStackTo   (KERNEL.108)
1138  */
1139 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1140 {
1141     TDB *pTask;
1142     STACK16FRAME *oldFrame, *newFrame;
1143     INSTANCEDATA *pData;
1144     UINT16 copySize;
1145
1146     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1147     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1148     TRACE("old=%04x:%04x new=%04x:%04x\n",
1149           SELECTOROF( pTask->teb->cur_stack ),
1150           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1151
1152     /* Save the old stack */
1153
1154     oldFrame = THREAD_STACK16( pTask->teb );
1155     /* pop frame + args and push bp */
1156     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1157                            + 2 * sizeof(WORD);
1158     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1159     pData->stacktop    = top;
1160     pData->stackmin    = ptr;
1161     pData->stackbottom = ptr;
1162
1163     /* Switch to the new stack */
1164
1165     /* Note: we need to take the 3 arguments into account; otherwise,
1166      * the stack will underflow upon return from this function.
1167      */
1168     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1169     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1170     pTask->teb->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1171     newFrame = THREAD_STACK16( pTask->teb );
1172
1173     /* Copy the stack frame and the local variables to the new stack */
1174
1175     memmove( newFrame, oldFrame, copySize );
1176     newFrame->bp = ptr;
1177     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1178 }
1179
1180
1181 /***********************************************************************
1182  *           SwitchStackBack   (KERNEL.109)
1183  */
1184 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1185 {
1186     STACK16FRAME *oldFrame, *newFrame;
1187     INSTANCEDATA *pData;
1188
1189     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1190         return;
1191     if (!pData->old_ss_sp)
1192     {
1193         WARN("No previous SwitchStackTo\n" );
1194         return;
1195     }
1196     TRACE("restoring stack %04x:%04x\n",
1197           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1198
1199     oldFrame = CURRENT_STACK16;
1200
1201     /* Pop bp from the previous stack */
1202
1203     BP_reg(context) = *(WORD *)MapSL(pData->old_ss_sp);
1204     pData->old_ss_sp += sizeof(WORD);
1205
1206     /* Switch back to the old stack */
1207
1208     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1209     context->SegSs = SELECTOROF(pData->old_ss_sp);
1210     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1211     pData->old_ss_sp = 0;
1212
1213     /* Build a stack frame for the return */
1214
1215     newFrame = CURRENT_STACK16;
1216     newFrame->frame32     = oldFrame->frame32;
1217     newFrame->module_cs   = oldFrame->module_cs;
1218     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1219     newFrame->entry_ip    = oldFrame->entry_ip;
1220 }
1221
1222
1223 /***********************************************************************
1224  *           GetTaskQueueDS16  (KERNEL.118)
1225  */
1226 void WINAPI GetTaskQueueDS16(void)
1227 {
1228     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1229 }
1230
1231
1232 /***********************************************************************
1233  *           GetTaskQueueES16  (KERNEL.119)
1234  */
1235 void WINAPI GetTaskQueueES16(void)
1236 {
1237     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1238 }
1239
1240
1241 /***********************************************************************
1242  *           GetCurrentTask   (KERNEL.36)
1243  */
1244 HTASK16 WINAPI GetCurrentTask(void)
1245 {
1246     return NtCurrentTeb()->htask16;
1247 }
1248
1249 DWORD WINAPI WIN16_GetCurrentTask(void)
1250 {
1251     /* This is the version used by relay code; the first task is */
1252     /* returned in the high word of the result */
1253     return MAKELONG( GetCurrentTask(), hFirstTask );
1254 }
1255
1256
1257 /***********************************************************************
1258  *           GetCurrentPDB   (KERNEL.37)
1259  *
1260  * UNDOC: returns PSP of KERNEL in high word
1261  */
1262 DWORD WINAPI GetCurrentPDB16(void)
1263 {
1264     TDB *pTask;
1265
1266     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1267     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1268 }
1269
1270
1271 /***********************************************************************
1272  *           GetCurPID16   (KERNEL.157)
1273  */
1274 DWORD WINAPI GetCurPID16( DWORD unused )
1275 {
1276     return 0;
1277 }
1278
1279
1280 /***********************************************************************
1281  *           GetInstanceData   (KERNEL.54)
1282  */
1283 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1284 {
1285     char *ptr = (char *)GlobalLock16( instance );
1286     if (!ptr || !len) return 0;
1287     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1288     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1289     return len;
1290 }
1291
1292
1293 /***********************************************************************
1294  *           GetExeVersion   (KERNEL.105)
1295  */
1296 WORD WINAPI GetExeVersion16(void)
1297 {
1298     TDB *pTask;
1299
1300     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1301     return pTask->version;
1302 }
1303
1304
1305 /***********************************************************************
1306  *           SetErrorMode16   (KERNEL.107)
1307  */
1308 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1309 {
1310     TDB *pTask;
1311     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1312     pTask->error_mode = mode;
1313     return SetErrorMode( mode );
1314 }
1315
1316
1317 /***********************************************************************
1318  *           GetNumTasks   (KERNEL.152)
1319  */
1320 UINT16 WINAPI GetNumTasks16(void)
1321 {
1322     return nTaskCount;
1323 }
1324
1325
1326 /***********************************************************************
1327  *           GetTaskDS   (KERNEL.155)
1328  *
1329  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1330  * I don't think we need to bother with this.
1331  */
1332 HINSTANCE16 WINAPI GetTaskDS16(void)
1333 {
1334     TDB *pTask;
1335
1336     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1337     return GlobalHandleToSel16(pTask->hInstance);
1338 }
1339
1340 /***********************************************************************
1341  *           GetDummyModuleHandleDS   (KERNEL.602)
1342  */
1343 WORD WINAPI GetDummyModuleHandleDS16(void)
1344 {
1345     TDB *pTask;
1346     WORD selector;
1347
1348     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1349     if (!(pTask->flags & TDBF_WIN32)) return 0;
1350     selector = GlobalHandleToSel16( pTask->hModule );
1351     CURRENT_DS = selector;
1352     return selector;
1353 }
1354
1355 /***********************************************************************
1356  *           IsTask   (KERNEL.320)
1357  *           IsTask16 (KERNEL32.@)
1358  */
1359 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1360 {
1361     TDB *pTask;
1362
1363     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1364     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1365     return (pTask->magic == TDB_MAGIC);
1366 }
1367
1368
1369 /***********************************************************************
1370  *           IsWinOldApTask16   (KERNEL.158)
1371  */
1372 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1373 {
1374     /* should return bit 0 of byte 0x48 in PSP */
1375     return FALSE;
1376 }
1377
1378 /***********************************************************************
1379  *           SetTaskSignalProc   (KERNEL.38)
1380  */
1381 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1382 {
1383     TDB *pTask;
1384     FARPROC16 oldProc;
1385
1386     if (!hTask) hTask = GetCurrentTask();
1387     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
1388     oldProc = pTask->userhandler;
1389     pTask->userhandler = proc;
1390     return oldProc;
1391 }
1392
1393 /***********************************************************************
1394  *           TASK_CallTaskSignalProc
1395  */
1396 /* ### start build ### */
1397 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1398 /* ### stop build ### */
1399 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1400 {
1401     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
1402     if ( !pTask || !pTask->userhandler ) return;
1403
1404     TASK_CallTo16_word_wwwww( pTask->userhandler,
1405                               hTaskOrModule, uCode, 0,
1406                               pTask->hInstance, pTask->hQueue );
1407 }
1408
1409 /***********************************************************************
1410  *           SetSigHandler   (KERNEL.140)
1411  */
1412 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1413                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1414 {
1415     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1416           newhandler,oldhandler,oldmode,newmode,flag );
1417
1418     if (flag != 1) return 0;
1419     if (!newmode) newhandler = NULL;  /* Default handler */
1420     if (newmode != 4)
1421     {
1422         TDB *pTask;
1423
1424         if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1425         if (oldmode) *oldmode = pTask->signal_flags;
1426         pTask->signal_flags = newmode;
1427         if (oldhandler) *oldhandler = pTask->sighandler;
1428         pTask->sighandler = newhandler;
1429     }
1430     return 0;
1431 }
1432
1433
1434 /***********************************************************************
1435  *           GlobalNotify   (KERNEL.154)
1436  *
1437  * Note that GlobalNotify does _not_ return the old NotifyProc
1438  * -- contrary to LocalNotify !!
1439  */
1440 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1441 {
1442     TDB *pTask;
1443
1444     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1445     pTask->discardhandler = proc;
1446 }
1447
1448
1449 /***********************************************************************
1450  *           GetExePtr   (KERNEL.133)
1451  */
1452 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1453 {
1454     char *ptr;
1455     HANDLE16 owner;
1456
1457       /* Check for module handle */
1458
1459     if (!(ptr = GlobalLock16( handle ))) return 0;
1460     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1461
1462       /* Search for this handle inside all tasks */
1463
1464     *hTask = hFirstTask;
1465     while (*hTask)
1466     {
1467         TDB *pTask = (TDB *)GlobalLock16( *hTask );
1468         if ((*hTask == handle) ||
1469             (pTask->hInstance == handle) ||
1470             (pTask->hQueue == handle) ||
1471             (pTask->hPDB == handle)) return pTask->hModule;
1472         *hTask = pTask->hNext;
1473     }
1474
1475       /* Check the owner for module handle */
1476
1477     owner = FarGetOwner16( handle );
1478     if (!(ptr = GlobalLock16( owner ))) return 0;
1479     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1480
1481       /* Search for the owner inside all tasks */
1482
1483     *hTask = hFirstTask;
1484     while (*hTask)
1485     {
1486         TDB *pTask = (TDB *)GlobalLock16( *hTask );
1487         if ((*hTask == owner) ||
1488             (pTask->hInstance == owner) ||
1489             (pTask->hQueue == owner) ||
1490             (pTask->hPDB == owner)) return pTask->hModule;
1491         *hTask = pTask->hNext;
1492     }
1493
1494     return 0;
1495 }
1496
1497 /**********************************************************************/
1498
1499 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1500 {
1501     HTASK16 hTask = 0;
1502     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1503     STACK16FRAME *frame = CURRENT_STACK16;
1504     frame->ecx = hModule;
1505     if (hTask) frame->es = hTask;
1506     return hModule;
1507 }
1508
1509 /**********************************************************************/
1510
1511 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1512 {
1513     HTASK16 hTask = 0;
1514     return GetExePtrHelper( handle, &hTask );
1515 }
1516
1517
1518 /***********************************************************************
1519  *           TaskFirst   (TOOLHELP.63)
1520  */
1521 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1522 {
1523     lpte->hNext = hFirstTask;
1524     return TaskNext16( lpte );
1525 }
1526
1527
1528 /***********************************************************************
1529  *           TaskNext   (TOOLHELP.64)
1530  */
1531 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1532 {
1533     TDB *pTask;
1534     INSTANCEDATA *pInstData;
1535
1536     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1537     if (!lpte->hNext) return FALSE;
1538
1539     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1540     while (1) {
1541         pTask = (TDB *)GlobalLock16( lpte->hNext );
1542         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1543         if (pTask->hInstance)
1544             break;
1545         lpte->hNext = pTask->hNext;
1546     }
1547     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1548     lpte->hTask         = lpte->hNext;
1549     lpte->hTaskParent   = pTask->hParent;
1550     lpte->hInst         = pTask->hInstance;
1551     lpte->hModule       = pTask->hModule;
1552     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1553     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1554     lpte->wStackTop     = pInstData->stacktop;
1555     lpte->wStackMinimum = pInstData->stackmin;
1556     lpte->wStackBottom  = pInstData->stackbottom;
1557     lpte->wcEvents      = pTask->nEvents;
1558     lpte->hQueue        = pTask->hQueue;
1559     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1560     lpte->wPSPOffset    = 0x100;  /*??*/
1561     lpte->hNext         = pTask->hNext;
1562     return TRUE;
1563 }
1564
1565
1566 /***********************************************************************
1567  *           TaskFindHandle   (TOOLHELP.65)
1568  */
1569 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1570 {
1571     lpte->hNext = hTask;
1572     return TaskNext16( lpte );
1573 }
1574
1575
1576 /**************************************************************************
1577  *           FatalAppExit16   (KERNEL.137)
1578  */
1579 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1580 {
1581     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
1582
1583     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1584     {
1585         if (Callout.MessageBoxA)
1586             Callout.MessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1587         else
1588             ERR( "%s\n", debugstr_a(str) );
1589     }
1590     ExitThread(0xff);
1591 }
1592
1593
1594 /***********************************************************************
1595  *           TerminateApp16   (TOOLHELP.77)
1596  *
1597  * See "Undocumented Windows".
1598  */
1599 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1600 {
1601     if (hTask && hTask != GetCurrentTask())
1602     {
1603         FIXME("cannot terminate task %x\n", hTask);
1604         return;
1605     }
1606
1607     if (wFlags & NO_UAE_BOX)
1608     {
1609         UINT16 old_mode;
1610         old_mode = SetErrorMode16(0);
1611         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1612     }
1613     FatalAppExit16( 0, NULL );
1614
1615     /* hmm, we're still alive ?? */
1616
1617     /* check undocumented flag */
1618     if (!(wFlags & 0x8000))
1619         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1620
1621     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1622        but let's just call ExitThread */
1623     ExitThread(0xff);
1624 }
1625
1626
1627 /***********************************************************************
1628  *           GetAppCompatFlags16   (KERNEL.354)
1629  */
1630 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1631 {
1632     return GetAppCompatFlags( hTask );
1633 }
1634
1635
1636 /***********************************************************************
1637  *           GetAppCompatFlags   (USER32.206)
1638  */
1639 DWORD WINAPI GetAppCompatFlags( HTASK hTask )
1640 {
1641     TDB *pTask;
1642
1643     if (!hTask) hTask = GetCurrentTask();
1644     if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
1645     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1646     return pTask->compat_flags;
1647 }