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 "process.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 PTR_SEG_OFF_TO_SEGPTR( 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 = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
 230                           pModule->self, WINE_LDT_FLAGS_DATA );
 231     if (!hTask) return FALSE;
 232     pTask = (TDB *)GlobalLock16( hTask );
 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_DWORD(&pTask->pdb.dispatcher[1], (DWORD)GetProcAddress16( GetModuleHandle16("KERNEL"),
 277                                                                   "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         PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel16(pTask->hPDB),
 283                                (int)&((PDB16 *)0)->fileHandles );
 284     pTask->pdb.hFileHandles = 0;
 285     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 286     pTask->pdb.environment    = current_envdb.env_sel;
 287     pTask->pdb.nbFiles        = 20;
 288
 289     /* Fill the command line */
 290
 291     if (!cmdline)
 292     {
 293         cmdline = current_envdb.cmd_line;
 294         /* remove the first word (program name) */
 295         if (*cmdline == '"')
 296             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = current_envdb.cmd_line;
 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       /* Set the owner of the environment block */
 318
 319     FarSetOwner16( pTask->pdb.environment, pTask->hPDB );
 320
 321       /* Default DTA overwrites command line */
 322
 323     pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
 324                                 (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 325
 326     /* Create scheduler event for 16-bit tasks */
 327
 328     if ( !(pTask->flags & TDBF_WIN32) )
 329         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 330
 331     /* Enter task handle into thread and process */
 332
 333     teb->htask16 = hTask;
 334     if (!initial_task) initial_task = hTask;
 335
 336     /* Add the task to the linked list */
 337
 338     _EnterWin16Lock();
 339     TASK_LinkTask( hTask );
 340     _LeaveWin16Lock();
 341
 342     return TRUE;
 343 }
 344
 345 /***********************************************************************
 346  *           TASK_DeleteTask
 347  */
 348 static void TASK_DeleteTask( HTASK16 hTask )
 349 {
 350     TDB *pTask;
 351     HGLOBAL16 hPDB;
 352
 353     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 354     hPDB = pTask->hPDB;
 355
 356     pTask->magic = 0xdead; /* invalidate signature */
 357
 358     /* Free the selector aliases */
 359
 360     GLOBAL_FreeBlock( pTask->hCSAlias );
 361     GLOBAL_FreeBlock( pTask->hPDB );
 362
 363     /* Free the task module */
 364
 365     FreeModule16( pTask->hModule );
 366
 367     /* Free the task structure itself */
 368
 369     GlobalFree16( hTask );
 370
 371     /* Free all memory used by this task (including the 32-bit stack, */
 372     /* the environment block and the thunk segments). */
 373
 374     GlobalFreeAll16( hPDB );
 375 }
 376
 377 /***********************************************************************
 378  *           TASK_KillTask
 379  */
 380 void TASK_ExitTask(void)
 381 {
 382     TDB *pTask;
 383     DWORD lockCount;
 384
 385     /* Enter the Win16Lock to protect global data structures */
 386     _EnterWin16Lock();
 387
 388     pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 389     if ( !pTask )
 390     {
 391         _LeaveWin16Lock();
 392         return;
 393     }
 394
 395     TRACE("Killing task %04x\n", pTask->hSelf );
 396
 397     /* Perform USER cleanup */
 398
 399     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 400     PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0 );
 401     PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, 0 );
 402     PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0 );
 403
 404     /* Remove the task from the list to be sure we never switch back to it */
 405     TASK_UnlinkTask( pTask->hSelf );
 406
 407     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 408     {
 409         TRACE("this is the last task, exiting\n" );
 410         ExitKernel16();
 411     }
 412
 413     if( nTaskCount )
 414     {
 415         TDB* p = (TDB *)GlobalLock16( hFirstTask );
 416         while( p )
 417         {
 418             if( p->hYieldTo == pTask->hSelf ) p->hYieldTo = 0;
 419             p = (TDB *)GlobalLock16( p->hNext );
 420         }
 421     }
 422
 423     pTask->nEvents = 0;
 424
 425     if ( hLockedTask == pTask->hSelf )
 426         hLockedTask = 0;
 427
 428     TASK_DeleteTask( pTask->hSelf );
 429
 430     /* ... schedule another one ... */
 431     TASK_Reschedule();
 432
 433     /* ... and completely release the Win16Lock, just in case. */
 434     ReleaseThunkLock( &lockCount );
 435 }
 436
 437 /***********************************************************************
 438  *           TASK_Reschedule
 439  *
 440  * This is where all the magic of task-switching happens!
 441  *
 442  * 16-bit Windows performs non-preemptive (cooperative) multitasking.
 443  * This means that each 16-bit task runs until it voluntarily yields
 444  * control, at which point the scheduler gets active and selects the
 445  * next task to run.
 446  *
 447  * In Wine, all processes, even 16-bit ones, are scheduled preemptively
 448  * by the standard scheduler of the underlying OS.  As many 16-bit apps
 449  * *rely* on the behaviour of the Windows scheduler, however, we have
 450  * to simulate that behaviour.
 451  *
 452  * This is achieved as follows: every 16-bit task is at time (except
 453  * during task creation and deletion) in one of two states: either it
 454  * is the one currently running, then the global variable hCurrentTask
 455  * contains its task handle, or it is not currently running, then it
 456  * is blocked on a special scheduler event, a global handle which
 457  * is stored in the task struct.
 458  *
 459  * When the current task yields control, this routine gets called. Its
 460  * purpose is to determine the next task to be active, signal the
 461  * scheduler event of that task, and then put the current task to sleep
 462  * waiting for *its* scheduler event to get signalled again.
 463  *
 464  * This routine can get called in a few other special situations as well:
 465  *
 466  * - On creation of a 16-bit task, the Unix process executing the task
 467  *   calls TASK_Reschedule once it has completed its initialization.
 468  *   At this point, the task needs to be blocked until its scheduler
 469  *   event is signalled the first time (this will be done by the parent
 470  *   process to get the task up and running).
 471  *
 472  * - When the task currently running terminates itself, this routine gets
 473  *   called and has to schedule another task, *without* blocking the
 474  *   terminating task.
 475  *
 476  * - When a 32-bit thread posts an event for a 16-bit task, it might be
 477  *   the case that *no* 16-bit task is currently running.  In this case
 478  *   the task that has now an event pending is to be scheduled.
 479  *
 480  */
 481 void TASK_Reschedule(void)
 482 {
 483     TDB *pOldTask = NULL, *pNewTask = NULL;
 484     HTASK16 hOldTask = 0, hNewTask = 0;
 485     enum { MODE_YIELD, MODE_SLEEP, MODE_WAKEUP } mode;
 486     DWORD lockCount;
 487
 488     _EnterWin16Lock();
 489
 490     /* Check what we need to do */
 491     hOldTask = GetCurrentTask();
 492     pOldTask = (TDB *)GlobalLock16( hOldTask );
 493     TRACE( "entered with hCurrentTask %04x by hTask %04x (pid %ld)\n",
 494            hCurrentTask, hOldTask, (long) getpid() );
 495
 496     if ( pOldTask && THREAD_IsWin16( NtCurrentTeb() ) )
 497     {
 498         /* We are called by an active (non-deleted) 16-bit task */
 499
 500         /* If we don't even have a current task, or else the current
 501            task has yielded, we'll need to schedule a new task and
 502            (possibly) put the calling task to sleep.  Otherwise, we
 503            only block the caller. */
 504
 505         if ( !hCurrentTask || hCurrentTask == hOldTask )
 506             mode = MODE_YIELD;
 507         else
 508             mode = MODE_SLEEP;
 509     }
 510     else
 511     {
 512         /* We are called by a deleted 16-bit task or a 32-bit thread */
 513
 514         /* The only situation where we need to do something is if we
 515            now do not have a current task.  Then, we'll need to wake up
 516            some task that has events pending. */
 517
 518         if ( !hCurrentTask || hCurrentTask == hOldTask )
 519             mode = MODE_WAKEUP;
 520         else
 521         {
 522             /* nothing to do */
 523             _LeaveWin16Lock();
 524             return;
 525         }
 526     }
 527
 528     /* Find a task to yield to: check for DirectedYield() */
 529     if ( mode == MODE_YIELD && pOldTask && pOldTask->hYieldTo )
 530     {
 531         hNewTask = pOldTask->hYieldTo;
 532         pNewTask = (TDB *)GlobalLock16( hNewTask );
 533         if( !pNewTask || !pNewTask->nEvents) hNewTask = 0;
 534         pOldTask->hYieldTo = 0;
 535     }
 536
 537     /* Find a task to yield to: check for pending events */
 538     if ( (mode == MODE_YIELD || mode == MODE_WAKEUP) && !hNewTask )
 539     {
 540         hNewTask = hFirstTask;
 541         while (hNewTask)
 542         {
 543             pNewTask = (TDB *)GlobalLock16( hNewTask );
 544
 545             TRACE( "\ttask = %04x, events = %i\n", hNewTask, pNewTask->nEvents );
 546
 547             if (pNewTask->nEvents) break;
 548             hNewTask = pNewTask->hNext;
 549         }
 550         if (hLockedTask && (hNewTask != hLockedTask)) hNewTask = 0;
 551     }
 552
 553     /* If we are still the task with highest priority, just return ... */
 554     if ( mode == MODE_YIELD && hNewTask && hNewTask == hCurrentTask )
 555     {
 556         TRACE("returning to the current task (%04x)\n", hCurrentTask );
 557         _LeaveWin16Lock();
 558
 559         /* Allow Win32 threads to thunk down even while a Win16 task is
 560            in a tight PeekMessage() or Yield() loop ... */
 561         ReleaseThunkLock( &lockCount );
 562         RestoreThunkLock( lockCount );
 563         return;
 564     }
 565
 566     /* If no task to yield to found, suspend 16-bit scheduler ... */
 567     if ( mode == MODE_YIELD && !hNewTask )
 568     {
 569         TRACE("No currently active task\n");
 570         hCurrentTask = 0;
 571     }
 572
 573     /* If we found a task to wake up, do it ... */
 574     if ( (mode == MODE_YIELD || mode == MODE_WAKEUP) && hNewTask )
 575     {
 576         TRACE("Switching to task %04x (%.8s)\n",
 577                       hNewTask, pNewTask->module_name );
 578
 579         pNewTask->priority++;
 580         TASK_UnlinkTask( hNewTask );
 581         TASK_LinkTask( hNewTask );
 582         pNewTask->priority--;
 583
 584         hCurrentTask = hNewTask;
 585         NtSetEvent( pNewTask->hEvent, NULL );
 586
 587         /* This is set just in case some app reads it ... */
 588         pNewTask->ss_sp = pNewTask->teb->cur_stack;
 589     }
 590
 591     /* If we need to put the current task to sleep, do it ... */
 592     if ( (mode == MODE_YIELD || mode == MODE_SLEEP) && hOldTask != hCurrentTask )
 593     {
 594         NtResetEvent( pOldTask->hEvent, NULL );
 595
 596         ReleaseThunkLock( &lockCount );
 597         SYSLEVEL_CheckNotLevel( 1 );
 598         WaitForSingleObject( pOldTask->hEvent, INFINITE );
 599         RestoreThunkLock( lockCount );
 600     }
 601
 602     _LeaveWin16Lock();
 603 }
 604
 605 /***********************************************************************
 606  *           InitTask  (KERNEL.91)
 607  *
 608  * Called by the application startup code.
 609  */
 610 void WINAPI InitTask16( CONTEXT86 *context )
 611 {
 612     TDB *pTask;
 613     INSTANCEDATA *pinstance;
 614     SEGPTR ptr;
 615
 616     context->Eax = 0;
 617     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
 618
 619     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 620        as some apps, notably Visual Basic apps, *modify* the heap/stack
 621        size of the instance data segment before calling InitTask() */
 622
 623     /* Initialize the INSTANCEDATA structure */
 624     pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
 625     pinstance->stackmin    = OFFSETOF( pTask->teb->cur_stack ) + sizeof( STACK16FRAME );
 626     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 627     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 628                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 629
 630     /* Initialize the local heap */
 631     if (LOWORD(context->Ecx))
 632         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 633
 634     /* Initialize implicitly loaded DLLs */
 635     NE_InitializeDLLs( pTask->hModule );
 636     NE_DllProcessAttach( pTask->hModule );
 637
 638     /* Registers on return are:
 639      * ax     1 if OK, 0 on error
 640      * cx     stack limit in bytes
 641      * dx     cmdShow parameter
 642      * si     instance handle of the previous instance
 643      * di     instance handle of the new task
 644      * es:bx  pointer to command line inside PSP
 645      *
 646      * 0 (=%bp) is pushed on the stack
 647      */
 648     ptr = stack16_push( sizeof(WORD) );
 649     *(WORD *)PTR_SEG_TO_LIN(ptr) = 0;
 650     context->Esp -= 2;
 651
 652     context->Eax = 1;
 653
 654     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 655     else
 656     {
 657         LPBYTE p = &pTask->pdb.cmdLine[1];
 658         while ((*p == ' ') || (*p == '\t')) p++;
 659         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 660     }
 661     context->Ecx   = pinstance->stacktop;
 662     context->Edx   = pTask->nCmdShow;
 663     context->Esi   = (DWORD)pTask->hPrevInstance;
 664     context->Edi   = (DWORD)pTask->hInstance;
 665     context->SegEs = (WORD)pTask->hPDB;
 666 }
 667
 668
 669 /***********************************************************************
 670  *           WaitEvent  (KERNEL.30)
 671  */
 672 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 673 {
 674     TDB *pTask;
 675
 676     if (!hTask) hTask = GetCurrentTask();
 677     pTask = (TDB *)GlobalLock16( hTask );
 678
 679     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 680     {
 681         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 682         return TRUE;
 683     }
 684
 685     if (pTask->nEvents > 0)
 686     {
 687         pTask->nEvents--;
 688         return FALSE;
 689     }
 690     TASK_Reschedule();
 691
 692     /* When we get back here, we have an event */
 693
 694     if (pTask->nEvents > 0) pTask->nEvents--;
 695     return TRUE;
 696 }
 697
 698
 699 /***********************************************************************
 700  *           PostEvent  (KERNEL.31)
 701  */
 702 void WINAPI PostEvent16( HTASK16 hTask )
 703 {
 704     TDB *pTask;
 705
 706     if (!hTask) hTask = GetCurrentTask();
 707     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 708
 709     if ( !THREAD_IsWin16( pTask->teb ) )
 710     {
 711         FIXME("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel );
 712         return;
 713     }
 714
 715     pTask->nEvents++;
 716
 717     /* If we are a 32-bit task, we might need to wake up the 16-bit scheduler */
 718     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 719         TASK_Reschedule();
 720 }
 721
 722
 723 /***********************************************************************
 724  *           SetPriority  (KERNEL.32)
 725  */
 726 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 727 {
 728     TDB *pTask;
 729     INT16 newpriority;
 730
 731     if (!hTask) hTask = GetCurrentTask();
 732     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 733     newpriority = pTask->priority + delta;
 734     if (newpriority < -32) newpriority = -32;
 735     else if (newpriority > 15) newpriority = 15;
 736
 737     pTask->priority = newpriority + 1;
 738     TASK_UnlinkTask( hTask );
 739     TASK_LinkTask( hTask );
 740     pTask->priority--;
 741 }
 742
 743
 744 /***********************************************************************
 745  *           LockCurrentTask  (KERNEL.33)
 746  */
 747 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 748 {
 749     if (bLock) hLockedTask = GetCurrentTask();
 750     else hLockedTask = 0;
 751     return hLockedTask;
 752 }
 753
 754
 755 /***********************************************************************
 756  *           IsTaskLocked  (KERNEL.122)
 757  */
 758 HTASK16 WINAPI IsTaskLocked16(void)
 759 {
 760     return hLockedTask;
 761 }
 762
 763
 764 /***********************************************************************
 765  *           OldYield  (KERNEL.117)
 766  */
 767 void WINAPI OldYield16(void)
 768 {
 769     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
 770
 771     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 772     {
 773         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 774         return;
 775     }
 776
 777     if (pCurTask) pCurTask->nEvents++;  /* Make sure we get back here */
 778     TASK_Reschedule();
 779     if (pCurTask) pCurTask->nEvents--;
 780 }
 781
 782 /***********************************************************************
 783  *           WIN32_OldYield16  (KERNEL.447)
 784  */
 785 void WINAPI WIN32_OldYield16(void)
 786 {
 787    DWORD count;
 788
 789    ReleaseThunkLock(&count);
 790    RestoreThunkLock(count);
 791 }
 792
 793 /***********************************************************************
 794  *           DirectedYield  (KERNEL.150)
 795  */
 796 void WINAPI DirectedYield16( HTASK16 hTask )
 797 {
 798     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
 799
 800     if ( !THREAD_IsWin16( NtCurrentTeb() ) )
 801     {
 802         FIXME("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel);
 803         return;
 804     }
 805
 806     TRACE("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 807
 808     pCurTask->hYieldTo = hTask;
 809     OldYield16();
 810
 811     TRACE("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
 812 }
 813
 814 /***********************************************************************
 815  *           Yield16  (KERNEL.29)
 816  */
 817 void WINAPI Yield16(void)
 818 {
 819     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
 820
 821     if (pCurTask) pCurTask->hYieldTo = 0;
 822     if (pCurTask && pCurTask->hQueue && Callout.UserYield16) Callout.UserYield16();
 823     else OldYield16();
 824 }
 825
 826 /***********************************************************************
 827  *           KERNEL_490  (KERNEL.490)
 828  */
 829 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 830 {
 831     if ( !someTask ) return 0;
 832
 833     FIXME("(%04x): stub\n", someTask );
 834     return 0;
 835 }
 836
 837 /***********************************************************************
 838  *           MakeProcInstance16  (KERNEL.51)
 839  */
 840 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 841 {
 842     BYTE *thunk,*lfunc;
 843     SEGPTR thunkaddr;
 844     WORD hInstanceSelector;
 845
 846     hInstanceSelector = GlobalHandleToSel16(hInstance);
 847
 848     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 849
 850     if (!HIWORD(func)) {
 851       /* Win95 actually protects via SEH, but this is better for debugging */
 852       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 853       return (FARPROC16)0;
 854     }
 855
 856     if (hInstance)
 857     {
 858         if ( (!(hInstance & 4)) ||
 859              ((hInstance != 0xffff) && IS_SELECTOR_FREE(hInstance|7)) )
 860         {
 861             WARN("Invalid hInstance (%04x) passed to MakeProcInstance !\n",
 862                 hInstance);
 863             return 0;
 864         }
 865     }
 866
 867     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 868       && (hInstance != 0)
 869       && (hInstance != 0xffff) )
 870     {
 871         /* calling MPI with a foreign DSEG is invalid ! */
 872         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 873                    hInstance,CURRENT_DS);
 874     }
 875
 876     /* Always use the DSEG that MPI was entered with.
 877      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 878      * as CURRENT_DS provides the DSEG value we need.
 879      * ("calling" DS, *not* "task" DS !) */
 880     hInstanceSelector = CURRENT_DS;
 881     hInstance = GlobalHandle16(hInstanceSelector);
 882
 883     /* no thunking for DLLs */
 884     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 885         return func;
 886
 887     thunkaddr = TASK_AllocThunk( GetCurrentTask() );
 888     if (!thunkaddr) return (FARPROC16)0;
 889     thunk = PTR_SEG_TO_LIN( thunkaddr );
 890     lfunc = PTR_SEG_TO_LIN( func );
 891
 892     TRACE("(%08lx,%04x): got thunk %08lx\n",
 893           (DWORD)func, hInstance, (DWORD)thunkaddr );
 894     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 895         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 896     ) {
 897         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 898     }
 899
 900     *thunk++ = 0xb8;    /* movw instance, %ax */
 901     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 902     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 903     *thunk++ = 0xea;    /* ljmp func */
 904     *(DWORD *)thunk = (DWORD)func;
 905     return (FARPROC16)thunkaddr;
 906     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 907 }
 908
 909
 910 /***********************************************************************
 911  *           FreeProcInstance16  (KERNEL.52)
 912  */
 913 void WINAPI FreeProcInstance16( FARPROC16 func )
 914 {
 915     TRACE("(%08lx)\n", (DWORD)func );
 916     TASK_FreeThunk( GetCurrentTask(), (SEGPTR)func );
 917 }
 918
 919 /**********************************************************************
 920  *          TASK_GetCodeSegment
 921  *
 922  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 923  * and logical segment number of a given code segment.
 924  *
 925  * 'proc' either *is* already a pair of module handle and segment number,
 926  * in which case there's nothing to do.  Otherwise, it is a pointer to
 927  * a function, and we need to retrieve the code segment.  If the pointer
 928  * happens to point to a thunk, we'll retrieve info about the code segment
 929  * where the function pointed to by the thunk resides, not the thunk itself.
 930  *
 931  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 932  *        the function the snoop code will return to ...
 933  *
 934  */
 935 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 936                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 937 {
 938     NE_MODULE *pModule = NULL;
 939     SEGTABLEENTRY *pSeg = NULL;
 940     int segNr=0;
 941
 942     /* Try pair of module handle / segment number */
 943     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 944     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 945     {
 946         segNr = LOWORD( proc );
 947         if ( segNr && segNr <= pModule->seg_count )
 948             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 949     }
 950
 951     /* Try thunk or function */
 952     else
 953     {
 954         BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
 955         WORD selector;
 956
 957         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 958             selector = thunk[6] + (thunk[7] << 8);
 959         else
 960             selector = HIWORD( proc );
 961
 962         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 963         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 964
 965         if ( pModule )
 966             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 967                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 968                     break;
 969
 970         if ( pModule && segNr > pModule->seg_count )
 971             pSeg = NULL;
 972     }
 973
 974     /* Abort if segment not found */
 975
 976     if ( !pModule || !pSeg )
 977         return FALSE;
 978
 979     /* Return segment data */
 980
 981     if ( ppModule ) *ppModule = pModule;
 982     if ( ppSeg    ) *ppSeg    = pSeg;
 983     if ( pSegNr   ) *pSegNr   = segNr;
 984
 985     return TRUE;
 986 }
 987
 988 /**********************************************************************
 989  *          GetCodeHandle    (KERNEL.93)
 990  */
 991 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 992 {
 993     SEGTABLEENTRY *pSeg;
 994
 995     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 996         return (HANDLE16)0;
 997
 998     return pSeg->hSeg;
 999 }
1000
1001 /**********************************************************************
1002  *          GetCodeInfo    (KERNEL.104)
1003  */
1004 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
1005 {
1006     NE_MODULE *pModule;
1007     SEGTABLEENTRY *pSeg;
1008     int segNr;
1009
1010     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1011         return FALSE;
1012
1013     /* Fill in segment information */
1014
1015     segInfo->offSegment = pSeg->filepos;
1016     segInfo->cbSegment  = pSeg->size;
1017     segInfo->flags      = pSeg->flags;
1018     segInfo->cbAlloc    = pSeg->minsize;
1019     segInfo->h          = pSeg->hSeg;
1020     segInfo->alignShift = pModule->alignment;
1021
1022     if ( segNr == pModule->dgroup )
1023         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
1024
1025     /* Return module handle in %es */
1026
1027     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1028
1029     return TRUE;
1030 }
1031
1032
1033 /**********************************************************************
1034  *          DefineHandleTable16    (KERNEL.94)
1035  */
1036 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1037 {
1038     FIXME("(%04x): stub ?\n", wOffset);
1039     return TRUE;
1040 }
1041
1042
1043 /***********************************************************************
1044  *           SetTaskQueue  (KERNEL.34)
1045  */
1046 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1047 {
1048     HQUEUE16 hPrev;
1049     TDB *pTask;
1050
1051     if (!hTask) hTask = GetCurrentTask();
1052     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1053
1054     hPrev = pTask->hQueue;
1055     pTask->hQueue = hQueue;
1056
1057     return hPrev;
1058 }
1059
1060
1061 /***********************************************************************
1062  *           GetTaskQueue  (KERNEL.35)
1063  */
1064 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1065 {
1066     TDB *pTask;
1067
1068     if (!hTask) hTask = GetCurrentTask();
1069     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1070     return pTask->hQueue;
1071 }
1072
1073 /***********************************************************************
1074  *           SetThreadQueue  (KERNEL.463)
1075  */
1076 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1077 {
1078     TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb();
1079     HQUEUE16 oldQueue = teb? teb->queue : 0;
1080
1081     if ( teb )
1082     {
1083         teb->queue = hQueue;
1084
1085         if ( GetTaskQueue16( teb->htask16 ) == oldQueue )
1086             SetTaskQueue16( teb->htask16, hQueue );
1087     }
1088
1089     return oldQueue;
1090 }
1091
1092 /***********************************************************************
1093  *           GetThreadQueue  (KERNEL.464)
1094  */
1095 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1096 {
1097     TEB *teb = NULL;
1098     if ( !thread )
1099         teb = NtCurrentTeb();
1100     else if ( HIWORD(thread) )
1101         teb = THREAD_IdToTEB( thread );
1102     else if ( IsTask16( (HTASK16)thread ) )
1103         teb = ((TDB *)GlobalLock16( (HANDLE16)thread ))->teb;
1104
1105     return (HQUEUE16)(teb? teb->queue : 0);
1106 }
1107
1108 /***********************************************************************
1109  *           SetFastQueue  (KERNEL.624)
1110  */
1111 VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue )
1112 {
1113     TEB *teb = NULL;
1114     if ( !thread )
1115         teb = NtCurrentTeb();
1116     else if ( HIWORD(thread) )
1117         teb = THREAD_IdToTEB( thread );
1118     else if ( IsTask16( (HTASK16)thread ) )
1119         teb = ((TDB *)GlobalLock16( (HANDLE16)thread ))->teb;
1120
1121     if ( teb ) teb->queue = (HQUEUE16) hQueue;
1122 }
1123
1124 /***********************************************************************
1125  *           GetFastQueue  (KERNEL.625)
1126  */
1127 HANDLE WINAPI GetFastQueue16( void )
1128 {
1129     TEB *teb = NtCurrentTeb();
1130     if (!teb) return 0;
1131
1132     if (!teb->queue && Callout.InitThreadInput16)
1133         Callout.InitThreadInput16( 0, THREAD_IsWin16(teb)? 4 : 5 );
1134
1135     if (!teb->queue)
1136         FIXME("(): should initialize thread-local queue, expect failure!\n" );
1137
1138     return (HANDLE)teb->queue;
1139 }
1140
1141 /***********************************************************************
1142  *           SwitchStackTo   (KERNEL.108)
1143  */
1144 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1145 {
1146     TDB *pTask;
1147     STACK16FRAME *oldFrame, *newFrame;
1148     INSTANCEDATA *pData;
1149     UINT16 copySize;
1150
1151     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1152     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1153     TRACE("old=%04x:%04x new=%04x:%04x\n",
1154           SELECTOROF( pTask->teb->cur_stack ),
1155           OFFSETOF( pTask->teb->cur_stack ), seg, ptr );
1156
1157     /* Save the old stack */
1158
1159     oldFrame = THREAD_STACK16( pTask->teb );
1160     /* pop frame + args and push bp */
1161     pData->old_ss_sp   = pTask->teb->cur_stack + sizeof(STACK16FRAME)
1162                            + 2 * sizeof(WORD);
1163     *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp) = oldFrame->bp;
1164     pData->stacktop    = top;
1165     pData->stackmin    = ptr;
1166     pData->stackbottom = ptr;
1167
1168     /* Switch to the new stack */
1169
1170     /* Note: we need to take the 3 arguments into account; otherwise,
1171      * the stack will underflow upon return from this function.
1172      */
1173     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1174     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1175     pTask->teb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg, ptr - copySize );
1176     newFrame = THREAD_STACK16( pTask->teb );
1177
1178     /* Copy the stack frame and the local variables to the new stack */
1179
1180     memmove( newFrame, oldFrame, copySize );
1181     newFrame->bp = ptr;
1182     *(WORD *)PTR_SEG_OFF_TO_LIN( seg, ptr ) = 0;  /* clear previous bp */
1183 }
1184
1185
1186 /***********************************************************************
1187  *           SwitchStackBack   (KERNEL.109)
1188  */
1189 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1190 {
1191     STACK16FRAME *oldFrame, *newFrame;
1192     INSTANCEDATA *pData;
1193
1194     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1195         return;
1196     if (!pData->old_ss_sp)
1197     {
1198         WARN("No previous SwitchStackTo\n" );
1199         return;
1200     }
1201     TRACE("restoring stack %04x:%04x\n",
1202           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1203
1204     oldFrame = CURRENT_STACK16;
1205
1206     /* Pop bp from the previous stack */
1207
1208     BP_reg(context) = *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp);
1209     pData->old_ss_sp += sizeof(WORD);
1210
1211     /* Switch back to the old stack */
1212
1213     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1214     context->SegSs = SELECTOROF(pData->old_ss_sp);
1215     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1216     pData->old_ss_sp = 0;
1217
1218     /* Build a stack frame for the return */
1219
1220     newFrame = CURRENT_STACK16;
1221     newFrame->frame32     = oldFrame->frame32;
1222     newFrame->module_cs   = oldFrame->module_cs;
1223     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1224     newFrame->entry_ip    = oldFrame->entry_ip;
1225 }
1226
1227
1228 /***********************************************************************
1229  *           GetTaskQueueDS16  (KERNEL.118)
1230  */
1231 void WINAPI GetTaskQueueDS16(void)
1232 {
1233     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1234 }
1235
1236
1237 /***********************************************************************
1238  *           GetTaskQueueES16  (KERNEL.119)
1239  */
1240 void WINAPI GetTaskQueueES16(void)
1241 {
1242     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1243 }
1244
1245
1246 /***********************************************************************
1247  *           GetCurrentTask   (KERNEL.36)
1248  */
1249 HTASK16 WINAPI GetCurrentTask(void)
1250 {
1251     return NtCurrentTeb()->htask16;
1252 }
1253
1254 DWORD WINAPI WIN16_GetCurrentTask(void)
1255 {
1256     /* This is the version used by relay code; the first task is */
1257     /* returned in the high word of the result */
1258     return MAKELONG( GetCurrentTask(), hFirstTask );
1259 }
1260
1261
1262 /***********************************************************************
1263  *           GetCurrentPDB   (KERNEL.37)
1264  *
1265  * UNDOC: returns PSP of KERNEL in high word
1266  */
1267 DWORD WINAPI GetCurrentPDB16(void)
1268 {
1269     TDB *pTask;
1270
1271     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1272     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1273 }
1274
1275
1276 /***********************************************************************
1277  *           GetCurPID16   (KERNEL.157)
1278  */
1279 DWORD WINAPI GetCurPID16( DWORD unused )
1280 {
1281     return 0;
1282 }
1283
1284
1285 /***********************************************************************
1286  *           GetInstanceData   (KERNEL.54)
1287  */
1288 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1289 {
1290     char *ptr = (char *)GlobalLock16( instance );
1291     if (!ptr || !len) return 0;
1292     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1293     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1294     return len;
1295 }
1296
1297
1298 /***********************************************************************
1299  *           GetExeVersion   (KERNEL.105)
1300  */
1301 WORD WINAPI GetExeVersion16(void)
1302 {
1303     TDB *pTask;
1304
1305     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1306     return pTask->version;
1307 }
1308
1309
1310 /***********************************************************************
1311  *           SetErrorMode16   (KERNEL.107)
1312  */
1313 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1314 {
1315     TDB *pTask;
1316     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1317     pTask->error_mode = mode;
1318     return SetErrorMode( mode );
1319 }
1320
1321
1322 /***********************************************************************
1323  *           GetDOSEnvironment   (KERNEL.131)
1324  */
1325 SEGPTR WINAPI GetDOSEnvironment16(void)
1326 {
1327     TDB *pTask;
1328
1329     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1330     return PTR_SEG_OFF_TO_SEGPTR( pTask->pdb.environment, 0 );
1331 }
1332
1333
1334 /***********************************************************************
1335  *           GetNumTasks   (KERNEL.152)
1336  */
1337 UINT16 WINAPI GetNumTasks16(void)
1338 {
1339     return nTaskCount;
1340 }
1341
1342
1343 /***********************************************************************
1344  *           GetTaskDS   (KERNEL.155)
1345  *
1346  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1347  * I don't think we need to bother with this.
1348  */
1349 HINSTANCE16 WINAPI GetTaskDS16(void)
1350 {
1351     TDB *pTask;
1352
1353     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1354     return GlobalHandleToSel16(pTask->hInstance);
1355 }
1356
1357 /***********************************************************************
1358  *           GetDummyModuleHandleDS   (KERNEL.602)
1359  */
1360 WORD WINAPI GetDummyModuleHandleDS16(void)
1361 {
1362     TDB *pTask;
1363     WORD selector;
1364
1365     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1366     if (!(pTask->flags & TDBF_WIN32)) return 0;
1367     selector = GlobalHandleToSel16( pTask->hModule );
1368     CURRENT_DS = selector;
1369     return selector;
1370 }
1371
1372 /***********************************************************************
1373  *           IsTask   (KERNEL.320)
1374  */
1375 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1376 {
1377     TDB *pTask;
1378
1379     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1380     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1381     return (pTask->magic == TDB_MAGIC);
1382 }
1383
1384
1385 /***********************************************************************
1386  *           IsWinOldApTask16   (KERNEL.158)
1387  */
1388 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1389 {
1390     /* should return bit 0 of byte 0x48 in PSP */
1391     return FALSE;
1392 }
1393
1394 /***********************************************************************
1395  *           SetTaskSignalProc   (KERNEL.38)
1396  */
1397 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1398 {
1399     TDB *pTask;
1400     FARPROC16 oldProc;
1401
1402     if (!hTask) hTask = GetCurrentTask();
1403     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
1404     oldProc = pTask->userhandler;
1405     pTask->userhandler = proc;
1406     return oldProc;
1407 }
1408
1409 /***********************************************************************
1410  *           TASK_CallTaskSignalProc
1411  */
1412 /* ### start build ### */
1413 extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
1414 /* ### stop build ### */
1415 void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
1416 {
1417     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
1418     if ( !pTask || !pTask->userhandler ) return;
1419
1420     TASK_CallTo16_word_wwwww( pTask->userhandler,
1421                               hTaskOrModule, uCode, 0,
1422                               pTask->hInstance, pTask->hQueue );
1423 }
1424
1425 /***********************************************************************
1426  *           SetSigHandler   (KERNEL.140)
1427  */
1428 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1429                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1430 {
1431     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1432           newhandler,oldhandler,oldmode,newmode,flag );
1433
1434     if (flag != 1) return 0;
1435     if (!newmode) newhandler = NULL;  /* Default handler */
1436     if (newmode != 4)
1437     {
1438         TDB *pTask;
1439
1440         if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1441         if (oldmode) *oldmode = pTask->signal_flags;
1442         pTask->signal_flags = newmode;
1443         if (oldhandler) *oldhandler = pTask->sighandler;
1444         pTask->sighandler = newhandler;
1445     }
1446     return 0;
1447 }
1448
1449
1450 /***********************************************************************
1451  *           GlobalNotify   (KERNEL.154)
1452  *
1453  * Note that GlobalNotify does _not_ return the old NotifyProc
1454  * -- contrary to LocalNotify !!
1455  */
1456 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1457 {
1458     TDB *pTask;
1459
1460     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1461     pTask->discardhandler = proc;
1462 }
1463
1464
1465 /***********************************************************************
1466  *           GetExePtr   (KERNEL.133)
1467  */
1468 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1469 {
1470     char *ptr;
1471     HANDLE16 owner;
1472
1473       /* Check for module handle */
1474
1475     if (!(ptr = GlobalLock16( handle ))) return 0;
1476     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1477
1478       /* Search for this handle inside all tasks */
1479
1480     *hTask = hFirstTask;
1481     while (*hTask)
1482     {
1483         TDB *pTask = (TDB *)GlobalLock16( *hTask );
1484         if ((*hTask == handle) ||
1485             (pTask->hInstance == handle) ||
1486             (pTask->hQueue == handle) ||
1487             (pTask->hPDB == handle)) return pTask->hModule;
1488         *hTask = pTask->hNext;
1489     }
1490
1491       /* Check the owner for module handle */
1492
1493     owner = FarGetOwner16( handle );
1494     if (!(ptr = GlobalLock16( owner ))) return 0;
1495     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1496
1497       /* Search for the owner inside all tasks */
1498
1499     *hTask = hFirstTask;
1500     while (*hTask)
1501     {
1502         TDB *pTask = (TDB *)GlobalLock16( *hTask );
1503         if ((*hTask == owner) ||
1504             (pTask->hInstance == owner) ||
1505             (pTask->hQueue == owner) ||
1506             (pTask->hPDB == owner)) return pTask->hModule;
1507         *hTask = pTask->hNext;
1508     }
1509
1510     return 0;
1511 }
1512
1513 /**********************************************************************/
1514
1515 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1516 {
1517     HTASK16 hTask = 0;
1518     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1519     STACK16FRAME *frame = CURRENT_STACK16;
1520     frame->ecx = hModule;
1521     if (hTask) frame->es = hTask;
1522     return hModule;
1523 }
1524
1525 /**********************************************************************/
1526
1527 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1528 {
1529     HTASK16 hTask = 0;
1530     return GetExePtrHelper( handle, &hTask );
1531 }
1532
1533
1534 /***********************************************************************
1535  *           TaskFirst   (TOOLHELP.63)
1536  */
1537 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1538 {
1539     lpte->hNext = hFirstTask;
1540     return TaskNext16( lpte );
1541 }
1542
1543
1544 /***********************************************************************
1545  *           TaskNext   (TOOLHELP.64)
1546  */
1547 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1548 {
1549     TDB *pTask;
1550     INSTANCEDATA *pInstData;
1551
1552     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1553     if (!lpte->hNext) return FALSE;
1554
1555     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1556     while (1) {
1557         pTask = (TDB *)GlobalLock16( lpte->hNext );
1558         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1559         if (pTask->hInstance)
1560             break;
1561         lpte->hNext = pTask->hNext;
1562     }
1563     pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( GlobalHandleToSel16(pTask->hInstance), 0 );
1564     lpte->hTask         = lpte->hNext;
1565     lpte->hTaskParent   = pTask->hParent;
1566     lpte->hInst         = pTask->hInstance;
1567     lpte->hModule       = pTask->hModule;
1568     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1569     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1570     lpte->wStackTop     = pInstData->stacktop;
1571     lpte->wStackMinimum = pInstData->stackmin;
1572     lpte->wStackBottom  = pInstData->stackbottom;
1573     lpte->wcEvents      = pTask->nEvents;
1574     lpte->hQueue        = pTask->hQueue;
1575     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1576     lpte->wPSPOffset    = 0x100;  /*??*/
1577     lpte->hNext         = pTask->hNext;
1578     return TRUE;
1579 }
1580
1581
1582 /***********************************************************************
1583  *           TaskFindHandle   (TOOLHELP.65)
1584  */
1585 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1586 {
1587     lpte->hNext = hTask;
1588     return TaskNext16( lpte );
1589 }
1590
1591
1592 /**************************************************************************
1593  *           FatalAppExit16   (KERNEL.137)
1594  */
1595 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1596 {
1597     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
1598
1599     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1600     {
1601         if (Callout.MessageBoxA)
1602             Callout.MessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1603         else
1604             ERR( "%s\n", debugstr_a(str) );
1605     }
1606     ExitThread(0xff);
1607 }
1608
1609
1610 /***********************************************************************
1611  *           TerminateApp16   (TOOLHELP.77)
1612  *
1613  * See "Undocumented Windows".
1614  */
1615 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1616 {
1617     if (hTask && hTask != GetCurrentTask())
1618     {
1619         FIXME("cannot terminate task %x\n", hTask);
1620         return;
1621     }
1622
1623     if (wFlags & NO_UAE_BOX)
1624     {
1625         UINT16 old_mode;
1626         old_mode = SetErrorMode16(0);
1627         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1628     }
1629     FatalAppExit16( 0, NULL );
1630
1631     /* hmm, we're still alive ?? */
1632
1633     /* check undocumented flag */
1634     if (!(wFlags & 0x8000))
1635         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1636
1637     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1638        but let's just call ExitThread */
1639     ExitThread(0xff);
1640 }
1641
1642
1643 /***********************************************************************
1644  *           GetAppCompatFlags16   (KERNEL.354)
1645  */
1646 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1647 {
1648     return GetAppCompatFlags( hTask );
1649 }
1650
1651
1652 /***********************************************************************
1653  *           GetAppCompatFlags   (USER32.206)
1654  */
1655 DWORD WINAPI GetAppCompatFlags( HTASK hTask )
1656 {
1657     TDB *pTask;
1658
1659     if (!hTask) hTask = GetCurrentTask();
1660     if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
1661     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1662     return pTask->compat_flags;
1663 }