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