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 "windows.h"
  13 #include "user.h"
  14 #include "callback.h"
  15 #include "drive.h"
  16 #include "file.h"
  17 #include "global.h"
  18 #include "instance.h"
  19 #include "message.h"
  20 #include "miscemu.h"
  21 #include "module.h"
  22 #include "neexe.h"
  23 #include "peexe.h"
  24 #include "pe_image.h"
  25 #include "process.h"
  26 #include "queue.h"
  27 #include "selectors.h"
  28 #include "stackframe.h"
  29 #include "task.h"
  30 #include "thread.h"
  31 #include "toolhelp.h"
  32 #include "winnt.h"
  33 #include "winsock.h"
  34 #include "thread.h"
  35 #include "syslevel.h"
  36 #include "debug.h"
  37 #include "dosexe.h"
  38 #include "dde_proc.h"
  39 #include "server.h"
  40
  41   /* Min. number of thunks allocated when creating a new segment */
  42 #define MIN_THUNKS  32
  43
  44   /* Pointer to function to switch to a larger stack */
  45 int (*IF1632_CallLargeStack)( int (*func)(), void *arg ) = NULL;
  46
  47   /* Pointer to debugger callback routine */
  48 void (*TASK_AddTaskEntryBreakpoint)( HTASK16 hTask ) = NULL;
  49
  50 static THHOOK DefaultThhook = { 0 };
  51 THHOOK *pThhook = &DefaultThhook;
  52
  53 #define hCurrentTask (pThhook->CurTDB)
  54 #define hFirstTask   (pThhook->HeadTDB)
  55 #define hLockedTask  (pThhook->LockTDB)
  56
  57 static HTASK16 hTaskToKill = 0;
  58 static UINT16 nTaskCount = 0;
  59
  60 static void TASK_YieldToSystem(TDB*);
  61
  62 extern BOOL32 THREAD_InitDone;
  63
  64
  65 /***********************************************************************
  66  *           TASK_InstallTHHook
  67  */
  68 void TASK_InstallTHHook( THHOOK *pNewThhook )
  69 {
  70      THHOOK *pOldThhook = pThhook;
  71
  72      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  73
  74      *pThhook = *pOldThhook;
  75 }
  76
  77 /***********************************************************************
  78  *           TASK_GetNextTask
  79  */
  80 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  81 {
  82     TDB* pTask = (TDB*)GlobalLock16(hTask);
  83
  84     if (pTask->hNext) return pTask->hNext;
  85     return (hFirstTask != hTask) ? hFirstTask : 0;
  86 }
  87
  88 /***********************************************************************
  89  *           TASK_LinkTask
  90  */
  91 static void TASK_LinkTask( HTASK16 hTask )
  92 {
  93     HTASK16 *prevTask;
  94     TDB *pTask;
  95
  96     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
  97     prevTask = &hFirstTask;
  98     while (*prevTask)
  99     {
 100         TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask );
 101         if (prevTaskPtr->priority >= pTask->priority) break;
 102         prevTask = &prevTaskPtr->hNext;
 103     }
 104     pTask->hNext = *prevTask;
 105     *prevTask = hTask;
 106     nTaskCount++;
 107 }
 108
 109
 110 /***********************************************************************
 111  *           TASK_UnlinkTask
 112  */
 113 static void TASK_UnlinkTask( HTASK16 hTask )
 114 {
 115     HTASK16 *prevTask;
 116     TDB *pTask;
 117
 118     prevTask = &hFirstTask;
 119     while (*prevTask && (*prevTask != hTask))
 120     {
 121         pTask = (TDB *)GlobalLock16( *prevTask );
 122         prevTask = &pTask->hNext;
 123     }
 124     if (*prevTask)
 125     {
 126         pTask = (TDB *)GlobalLock16( *prevTask );
 127         *prevTask = pTask->hNext;
 128         pTask->hNext = 0;
 129         nTaskCount--;
 130     }
 131 }
 132
 133
 134 /***********************************************************************
 135  *           TASK_CreateThunks
 136  *
 137  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 138  * and containing 'count' entries.
 139  */
 140 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 141 {
 142     int i;
 143     WORD free;
 144     THUNKS *pThunk;
 145
 146     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 147     pThunk->next = 0;
 148     pThunk->magic = THUNK_MAGIC;
 149     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 150     free = pThunk->free;
 151     for (i = 0; i < count-1; i++)
 152     {
 153         free += 8;  /* Offset of next thunk */
 154         pThunk->thunks[4*i] = free;
 155     }
 156     pThunk->thunks[4*i] = 0;  /* Last thunk */
 157 }
 158
 159
 160 /***********************************************************************
 161  *           TASK_AllocThunk
 162  *
 163  * Allocate a thunk for MakeProcInstance().
 164  */
 165 static SEGPTR TASK_AllocThunk( HTASK16 hTask )
 166 {
 167     TDB *pTask;
 168     THUNKS *pThunk;
 169     WORD sel, base;
 170
 171     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 172     sel = pTask->hCSAlias;
 173     pThunk = &pTask->thunks;
 174     base = (int)pThunk - (int)pTask;
 175     while (!pThunk->free)
 176     {
 177         sel = pThunk->next;
 178         if (!sel)  /* Allocate a new segment */
 179         {
 180             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 181                                 pTask->hPDB, TRUE, FALSE, FALSE );
 182             if (!sel) return (SEGPTR)0;
 183             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 184             pThunk->next = sel;
 185         }
 186         pThunk = (THUNKS *)GlobalLock16( sel );
 187         base = 0;
 188     }
 189     base += pThunk->free;
 190     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 191     return PTR_SEG_OFF_TO_SEGPTR( sel, base );
 192 }
 193
 194
 195 /***********************************************************************
 196  *           TASK_FreeThunk
 197  *
 198  * Free a MakeProcInstance() thunk.
 199  */
 200 static BOOL32 TASK_FreeThunk( HTASK16 hTask, SEGPTR thunk )
 201 {
 202     TDB *pTask;
 203     THUNKS *pThunk;
 204     WORD sel, base;
 205
 206     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 207     sel = pTask->hCSAlias;
 208     pThunk = &pTask->thunks;
 209     base = (int)pThunk - (int)pTask;
 210     while (sel && (sel != HIWORD(thunk)))
 211     {
 212         sel = pThunk->next;
 213         pThunk = (THUNKS *)GlobalLock16( sel );
 214         base = 0;
 215     }
 216     if (!sel) return FALSE;
 217     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 218     pThunk->free = LOWORD(thunk) - base;
 219     return TRUE;
 220 }
 221
 222
 223 /***********************************************************************
 224  *           TASK_CallToStart
 225  *
 226  * 32-bit entry point for a new task. This function is responsible for
 227  * setting up the registers and jumping to the 16-bit entry point.
 228  */
 229 static void TASK_CallToStart(void)
 230 {
 231     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 232     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 233     SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
 234
 235     SET_CUR_THREAD( pTask->thdb );
 236     CLIENT_InitThread();
 237
 238     /* Terminate the stack frame chain */
 239     memset(THREAD_STACK16( pTask->thdb ), '\0', sizeof(STACK16FRAME));
 240
 241     if (pModule->flags & NE_FFLAGS_WIN32)
 242     {
 243         /* FIXME: all this is an ugly hack */
 244
 245         LPTHREAD_START_ROUTINE entry = (LPTHREAD_START_ROUTINE)
 246                 RVA_PTR(pModule->module32, OptionalHeader.AddressOfEntryPoint);
 247
 248         if (PE_HEADER(pModule->module32)->OptionalHeader.Subsystem==IMAGE_SUBSYSTEM_WINDOWS_CUI)
 249                 AllocConsole();
 250
 251         if (pModule->heap_size)
 252             LocalInit( pTask->hInstance, 0, pModule->heap_size );
 253
 254         InitApp( pTask->hModule );
 255         MODULE_InitializeDLLs( PROCESS_Current(), 0, DLL_PROCESS_ATTACH, (LPVOID)-1 );
 256         TRACE(relay, "(entryproc=%p)\n", entry );
 257
 258 #if 1
 259         ExitProcess( entry(NULL) );
 260 #else
 261 {
 262         DWORD size = PE_HEADER(pModule->module32)->OptionalHeader.SizeOfStackReserve;
 263         DWORD id;
 264         THDB *thdb;
 265
 266         CreateThread( NULL, size, entry, NULL, 0, &id );
 267         thdb = THREAD_ID_TO_THDB( id );
 268
 269         while ( thdb->exit_code == 0x103 )
 270         {
 271             WaitEvent( 0 );
 272             QUEUE_Signal( pTask->hSelf );
 273         }
 274
 275         ExitProcess( thdb->exit_code );
 276 }
 277 #endif
 278     }
 279     else if (pModule->dos_image)
 280     {
 281         DOSVM_Enter( NULL );
 282         ExitProcess( 0 );
 283     }
 284     else
 285     {
 286         /* Registers at initialization must be:
 287          * ax   zero
 288          * bx   stack size in bytes
 289          * cx   heap size in bytes
 290          * si   previous app instance
 291          * di   current app instance
 292          * bp   zero
 293          * es   selector to the PSP
 294          * ds   dgroup of the application
 295          * ss   stack selector
 296          * sp   top of the stack
 297          */
 298         CONTEXT context;
 299
 300         memset( &context, 0, sizeof(context) );
 301         CS_reg(&context)  = GlobalHandleToSel(pSegTable[pModule->cs - 1].hSeg);
 302         DS_reg(&context)  = GlobalHandleToSel(pSegTable[pModule->dgroup - 1].hSeg);
 303         ES_reg(&context)  = pTask->hPDB;
 304         EIP_reg(&context) = pModule->ip;
 305         EBX_reg(&context) = pModule->stack_size;
 306         ECX_reg(&context) = pModule->heap_size;
 307         EDI_reg(&context) = context.SegDs;
 308
 309         TRACE(task, "Starting main program: cs:ip=%04lx:%04x ds=%04lx ss:sp=%04x:%04x\n",
 310                       CS_reg(&context), IP_reg(&context), DS_reg(&context),
 311                       SELECTOROF(pTask->thdb->cur_stack),
 312                       OFFSETOF(pTask->thdb->cur_stack) );
 313
 314         Callbacks->CallRegisterShortProc( &context, 0 );
 315         /* This should never return */
 316         ERR( task, "Main program returned! (should never happen)\n" );
 317         ExitProcess( 1 );
 318     }
 319 }
 320
 321
 322 /***********************************************************************
 323  *           TASK_Create
 324  *
 325  * NOTE: This routine might be called by a Win32 thread. We don't have
 326  *       any real problems with that, since we operated merely on a private
 327  *       TDB structure that is not yet linked into the task list.
 328  */
 329 HTASK16 TASK_Create( THDB *thdb, NE_MODULE *pModule, HINSTANCE16 hInstance,
 330                      HINSTANCE16 hPrevInstance, UINT16 cmdShow)
 331 {
 332     HTASK16 hTask;
 333     TDB *pTask, *pInitialTask;
 334     LPSTR cmd_line;
 335     WORD sp;
 336     char *stack32Top;
 337     char name[10];
 338     STACK16FRAME *frame16;
 339     STACK32FRAME *frame32;
 340     PDB32 *pdb32 = thdb->process;
 341     SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
 342
 343       /* Allocate the task structure */
 344
 345     hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
 346                           pModule->self, FALSE, FALSE, FALSE );
 347     if (!hTask) return 0;
 348     pTask = (TDB *)GlobalLock16( hTask );
 349
 350     /* Fill the task structure */
 351
 352     pTask->nEvents       = 1;  /* So the task can be started */
 353     pTask->hSelf         = hTask;
 354     pTask->flags         = 0;
 355
 356     if (pModule->flags & NE_FFLAGS_WIN32)
 357         pTask->flags    |= TDBF_WIN32;
 358     if (pModule->lpDosTask)
 359         pTask->flags    |= TDBF_WINOLDAP;
 360
 361     pTask->version       = pModule->expected_version;
 362     pTask->hInstance     = hInstance;
 363     pTask->hPrevInstance = hPrevInstance;
 364     pTask->hModule       = pModule->self;
 365     pTask->hParent       = GetCurrentTask();
 366     pTask->magic         = TDB_MAGIC;
 367     pTask->nCmdShow      = cmdShow;
 368     pTask->thdb          = thdb;
 369     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 370     strcpy( pTask->curdir, "\\" );
 371     lstrcpyn32A( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 372                  sizeof(pTask->curdir) - 1 );
 373
 374       /* Create the thunks block */
 375
 376     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 377
 378       /* Copy the module name */
 379
 380     GetModuleName( pModule->self, name, sizeof(name) );
 381     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 382
 383       /* Allocate a selector for the PDB */
 384
 385     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
 386                                     pModule->self, FALSE, FALSE, FALSE, NULL );
 387
 388       /* Fill the PDB */
 389
 390     pTask->pdb.int20 = 0x20cd;
 391     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 392     PUT_DWORD(&pTask->pdb.dispatcher[1], (DWORD)NE_GetEntryPoint(
 393            GetModuleHandle16("KERNEL"), 102 ));  /* KERNEL.102 is DOS3Call() */
 394     pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
 395     pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
 396     pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
 397     pTask->pdb.fileHandlesPtr =
 398         PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel(pTask->hPDB),
 399                                (int)&((PDB *)0)->fileHandles );
 400     pTask->pdb.hFileHandles = 0;
 401     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 402     pTask->pdb.environment    = pdb32->env_db->env_sel;
 403     pTask->pdb.nbFiles        = 20;
 404
 405     /* Fill the command line */
 406
 407     cmd_line = pdb32->env_db->cmd_line;
 408     while (*cmd_line && (*cmd_line != ' ') && (*cmd_line != '\t')) cmd_line++;
 409     while ((*cmd_line == ' ') || (*cmd_line == '\t')) cmd_line++;
 410     lstrcpyn32A( pTask->pdb.cmdLine+1, cmd_line, sizeof(pTask->pdb.cmdLine)-1);
 411     pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 );
 412
 413       /* Get the compatibility flags */
 414
 415     pTask->compat_flags = GetProfileInt32A( "Compatibility", name, 0 );
 416
 417       /* Allocate a code segment alias for the TDB */
 418
 419     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 420                                           sizeof(TDB), pTask->hPDB, TRUE,
 421                                           FALSE, FALSE, NULL );
 422
 423       /* Set the owner of the environment block */
 424
 425     FarSetOwner( pTask->pdb.environment, pTask->hPDB );
 426
 427       /* Default DTA overwrites command-line */
 428
 429     pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
 430                                 (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 431
 432     /* Inherit default UserSignalHandler from initial process */
 433
 434     pInitialTask = (TDB *)GlobalLock16( PROCESS_Initial()->task );
 435     if ( pInitialTask )
 436         pTask->userhandler = pInitialTask->userhandler;
 437
 438     /* Create the 16-bit stack frame */
 439
 440     if (!(sp = pModule->sp))
 441         sp = pSegTable[pModule->ss-1].minsize + pModule->stack_size;
 442     sp &= ~1;  sp -= 2*sizeof(STACK16FRAME);
 443     pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( pTask->hInstance, sp );
 444     frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
 445     frame16->ebp = sp + (int)&((STACK16FRAME *)0)->bp;
 446     frame16->bp = LOWORD(frame16->ebp);
 447     frame16->ds = frame16->es = pTask->hInstance;
 448     frame16->fs = 0;
 449     frame16->entry_point = 0;
 450     frame16->entry_cs = 0;
 451     frame16->mutex_count = 1; /* TASK_Reschedule is called from 16-bit code */
 452     /* The remaining fields will be initialized in TASK_Reschedule */
 453
 454     /* Create the 32-bit stack frame */
 455
 456     stack32Top = (char*)pTask->thdb->teb.stack_top;
 457     frame16->frame32 = frame32 = (STACK32FRAME *)stack32Top - 1;
 458     frame32->frame16 = pTask->thdb->cur_stack + sizeof(STACK16FRAME);
 459     frame32->edi     = 0;
 460     frame32->esi     = 0;
 461     frame32->edx     = 0;
 462     frame32->ecx     = 0;
 463     frame32->ebx     = 0;
 464     frame32->retaddr = (DWORD)TASK_CallToStart;
 465     /* The remaining fields will be initialized in TASK_Reschedule */
 466
 467
 468     TRACE(task, "module='%s' cmdline='%s' task=%04x\n",
 469           name, cmd_line, hTask );
 470
 471     return hTask;
 472 }
 473
 474 /***********************************************************************
 475  *           TASK_StartTask
 476  *
 477  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 478  *       to be careful to protect global data structures. We do this
 479  *       by entering the Win16Lock while linking the task into the
 480  *       global task list.
 481  */
 482 void TASK_StartTask( HTASK16 hTask )
 483 {
 484     /* Add the task to the linked list */
 485
 486     SYSLEVEL_EnterWin16Lock();
 487     TASK_LinkTask( hTask );
 488     SYSLEVEL_LeaveWin16Lock();
 489
 490     TRACE(task, "linked task %04x\n", hTask );
 491
 492     /* If requested, add entry point breakpoint */
 493
 494     if ( TASK_AddTaskEntryBreakpoint )
 495         TASK_AddTaskEntryBreakpoint( hTask );
 496
 497     /* Get the task up and running. If we ourselves are a 16-bit task,
 498        we simply Yield(). If we are 32-bit however, we need to signal
 499        the main process somehow (NOT YET IMPLEMENTED!) */
 500
 501     if ( THREAD_IsWin16( THREAD_Current() ) )
 502         OldYield();
 503     else
 504         FIXME(task, "Don't know how to start 16-bit task from 32-bit thread. Move the mouse!\n");
 505 }
 506
 507
 508 /***********************************************************************
 509  *           TASK_DeleteTask
 510  */
 511 static void TASK_DeleteTask( HTASK16 hTask )
 512 {
 513     TDB *pTask;
 514     HGLOBAL16 hPDB;
 515
 516     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 517     hPDB = pTask->hPDB;
 518
 519     pTask->magic = 0xdead; /* invalidate signature */
 520
 521     /* Delete the Win32 part of the task */
 522
 523     K32OBJ_DecCount( &pTask->thdb->process->header );
 524     K32OBJ_DecCount( &pTask->thdb->header );
 525
 526     /* Free the selector aliases */
 527
 528     GLOBAL_FreeBlock( pTask->hCSAlias );
 529     GLOBAL_FreeBlock( pTask->hPDB );
 530
 531     /* Free the task module */
 532
 533     FreeModule16( pTask->hModule );
 534
 535     /* Free the task structure itself */
 536
 537     GlobalFree16( hTask );
 538
 539     /* Free all memory used by this task (including the 32-bit stack, */
 540     /* the environment block and the thunk segments). */
 541
 542     GlobalFreeAll( hPDB );
 543 }
 544
 545
 546 /***********************************************************************
 547  *           TASK_KillCurrentTask
 548  *
 549  * Kill the currently running task. As it's not possible to kill the
 550  * current task like this, it is simply marked for destruction, and will
 551  * be killed when either TASK_Reschedule or this function is called again
 552  * in the context of another task.
 553  */
 554 void TASK_KillCurrentTask( INT16 exitCode )
 555 {
 556     TDB* pTask = (TDB*) GlobalLock16( GetCurrentTask() );
 557     NE_MODULE* pModule = NE_GetPtr( pTask->hModule );
 558     if (!pTask) USER_ExitWindows();  /* No current task yet */
 559
 560     if ( !THREAD_IsWin16( THREAD_Current() ) )
 561     {
 562         FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
 563         return;
 564     }
 565
 566     /* Enter the Win16Lock to protect global data structures
 567        NOTE: We never explicitly leave it again. This shouldn't matter
 568              though, as it will be released in TASK_Reschedule and this
 569              task won't ever get scheduled again ... */
 570
 571     SYSLEVEL_EnterWin16Lock();
 572
 573     assert(hCurrentTask == GetCurrentTask());
 574
 575     TRACE(task, "Killing task %04x\n", hCurrentTask );
 576
 577     /* Delete active sockets */
 578
 579     if( pTask->pwsi )
 580         WINSOCK_DeleteTaskWSI( pTask, pTask->pwsi );
 581
 582 #ifdef MZ_SUPPORTED
 583     /* Kill DOS VM task */
 584     if ( pModule->lpDosTask )
 585         MZ_KillModule( pModule->lpDosTask );
 586 #endif
 587
 588     /* Perform USER cleanup */
 589
 590     if (pTask->userhandler)
 591         pTask->userhandler( hCurrentTask, USIG_TERMINATION, 0,
 592                             pTask->hInstance, pTask->hQueue );
 593
 594     if (hTaskToKill && (hTaskToKill != hCurrentTask))
 595     {
 596         /* If another task is already marked for destruction, */
 597         /* we can kill it now, as we are in another context.  */
 598         TASK_DeleteTask( hTaskToKill );
 599     }
 600
 601     if (nTaskCount <= 1)
 602     {
 603         TRACE(task, "this is the last task, exiting\n" );
 604         USER_ExitWindows();
 605     }
 606
 607     if (!__winelib)
 608     {
 609     /* FIXME: Hack! Send a message to the initial task so that
 610      * the GetMessage wakes up and the initial task can check whether
 611      * it is the only remaining one and terminate itself ...
 612      * The initial task should probably install hooks or something
 613      * to get informed about task termination :-/
 614      */
 615         HTASK16 hTask = PROCESS_Initial()->task;
 616         HMODULE16 hModule = GetModuleHandle16( "USER" );
 617         FARPROC16 postFunc = WIN32_GetProcAddress16( hModule, "PostAppMessage" );
 618         if (postFunc)
 619             Callbacks->CallPostAppMessageProc( postFunc, hTask, WM_NULL, 0, 0 );
 620     }
 621
 622     /* Remove the task from the list to be sure we never switch back to it */
 623     TASK_UnlinkTask( hCurrentTask );
 624     if( nTaskCount )
 625     {
 626         TDB* p = (TDB *)GlobalLock16( hFirstTask );
 627         while( p )
 628         {
 629             if( p->hYieldTo == hCurrentTask ) p->hYieldTo = 0;
 630             p = (TDB *)GlobalLock16( p->hNext );
 631         }
 632     }
 633
 634     hTaskToKill = hCurrentTask;
 635     hLockedTask = 0;
 636
 637     pTask->nEvents = 0;
 638     TASK_YieldToSystem(pTask);
 639
 640     /* We should never return from this Yield() */
 641
 642     ERR(task,"Return of the living dead %04x!!!\n", hCurrentTask);
 643     exit(1);
 644 }
 645
 646 /***********************************************************************
 647  *           TASK_Reschedule
 648  *
 649  * This is where all the magic of task-switching happens!
 650  *
 651  * Note: This function should only be called via the TASK_YieldToSystem()
 652  *       wrapper, to make sure that all the context is saved correctly.
 653  *
 654  *       It must not call functions that may yield control.
 655  */
 656 void TASK_Reschedule(void)
 657 {
 658     TDB *pOldTask = NULL, *pNewTask;
 659     HTASK16 hTask = 0;
 660     STACK16FRAME *newframe16;
 661
 662     /* Get the initial task up and running */
 663     if (!hCurrentTask && GetCurrentTask())
 664     {
 665         /* We need to remove one pair of stackframes (exept for Winelib) */
 666         STACK16FRAME *oldframe16 = CURRENT_STACK16;
 667         STACK32FRAME *oldframe32 = oldframe16->frame32;
 668         STACK16FRAME *newframe16 = PTR_SEG_TO_LIN( oldframe32->frame16 );
 669         STACK32FRAME *newframe32 = newframe16->frame32;
 670         if (newframe32)
 671         {
 672             newframe16->entry_ip     = oldframe16->entry_ip;
 673             newframe16->entry_cs     = oldframe16->entry_cs;
 674             newframe16->ip           = oldframe16->ip;
 675             newframe16->cs           = oldframe16->cs;
 676             newframe32->ebp          = oldframe32->ebp;
 677             newframe32->restore_addr = oldframe32->restore_addr;
 678             newframe32->codeselector = oldframe32->codeselector;
 679
 680             THREAD_Current()->cur_stack = oldframe32->frame16;
 681         }
 682
 683         hCurrentTask = GetCurrentTask();
 684         pNewTask = (TDB *)GlobalLock16( hCurrentTask );
 685         pNewTask->ss_sp = pNewTask->thdb->cur_stack;
 686         return;
 687     }
 688
 689     /* NOTE: As we are entered from 16-bit code, we hold the Win16Lock.
 690              We hang onto it thoughout most of this routine, so that accesses
 691              to global variables (most notably the task list) are protected. */
 692     assert(hCurrentTask == GetCurrentTask());
 693
 694     TRACE(task, "entered with hTask %04x (pid %d)\n", hCurrentTask, getpid());
 695
 696 #ifdef CONFIG_IPC
 697     /* FIXME: What about the Win16Lock ??? */
 698     dde_reschedule();
 699 #endif
 700       /* First check if there's a task to kill */
 701
 702     if (hTaskToKill && (hTaskToKill != hCurrentTask))
 703     {
 704         TASK_DeleteTask( hTaskToKill );
 705         hTaskToKill = 0;
 706     }
 707
 708     /* Find a task to yield to */
 709
 710     pOldTask = (TDB *)GlobalLock16( hCurrentTask );
 711     if (pOldTask && pOldTask->hYieldTo)
 712     {
 713         /* check for DirectedYield() */
 714
 715         hTask = pOldTask->hYieldTo;
 716         pNewTask = (TDB *)GlobalLock16( hTask );
 717         if( !pNewTask || !pNewTask->nEvents) hTask = 0;
 718         pOldTask->hYieldTo = 0;
 719     }
 720
 721     /* extract hardware events only! */
 722
 723     if (!hTask) EVENT_WaitNetEvent( FALSE, TRUE );
 724
 725     while (!hTask)
 726     {
 727         /* Find a task that has an event pending */
 728
 729         hTask = hFirstTask;
 730         while (hTask)
 731         {
 732             pNewTask = (TDB *)GlobalLock16( hTask );
 733
 734             TRACE(task, "\ttask = %04x, events = %i\n", hTask, pNewTask->nEvents);
 735
 736             if (pNewTask->nEvents) break;
 737             hTask = pNewTask->hNext;
 738         }
 739         if (hLockedTask && (hTask != hLockedTask)) hTask = 0;
 740         if (hTask) break;
 741
 742         /* No task found, wait for some events to come in */
 743
 744         /* NOTE: We release the Win16Lock while waiting for events. This is to enable
 745                  Win32 threads to thunk down to 16-bit temporarily. Since Win16
 746                  tasks won't execute and Win32 threads are not allowed to enter
 747                  TASK_Reschedule anyway, there should be no re-entrancy problem ... */
 748
 749         SYSLEVEL_ReleaseWin16Lock();
 750         EVENT_WaitNetEvent( TRUE, TRUE );
 751         SYSLEVEL_RestoreWin16Lock();
 752     }
 753
 754     if (hTask == hCurrentTask)
 755     {
 756        TRACE(task, "returning to the current task(%04x)\n", hTask );
 757        return;  /* Nothing to do */
 758     }
 759     pNewTask = (TDB *)GlobalLock16( hTask );
 760     TRACE(task, "Switching to task %04x (%.8s)\n",
 761                   hTask, pNewTask->module_name );
 762
 763      /* Make the task the last in the linked list (round-robin scheduling) */
 764
 765     pNewTask->priority++;
 766     TASK_UnlinkTask( hTask );
 767     TASK_LinkTask( hTask );
 768     pNewTask->priority--;
 769
 770     /* Finish initializing the new task stack if necessary */
 771
 772     newframe16 = THREAD_STACK16( pNewTask->thdb );
 773     if (!newframe16->entry_cs)
 774     {
 775         STACK16FRAME *oldframe16 = CURRENT_STACK16;
 776         STACK32FRAME *oldframe32 = oldframe16->frame32;
 777         STACK32FRAME *newframe32 = newframe16->frame32;
 778         newframe16->entry_ip     = oldframe16->entry_ip;
 779         newframe16->entry_cs     = oldframe16->entry_cs;
 780         newframe16->ip           = oldframe16->ip;
 781         newframe16->cs           = oldframe16->cs;
 782         newframe32->ebp          = oldframe32->ebp;
 783         newframe32->restore_addr = oldframe32->restore_addr;
 784         newframe32->codeselector = oldframe32->codeselector;
 785     }
 786
 787     /* Switch to the new stack */
 788
 789     /* NOTE: We need to release/restore the Win16Lock, as the task
 790              switched to might be at another recursion level than
 791              the old task ... */
 792
 793     SYSLEVEL_ReleaseWin16Lock();
 794
 795     hCurrentTask = hTask;
 796     SET_CUR_THREAD( pNewTask->thdb );
 797     pNewTask->ss_sp = pNewTask->thdb->cur_stack;
 798
 799     SYSLEVEL_RestoreWin16Lock();
 800 }
 801
 802
 803 /***********************************************************************
 804  *           TASK_YieldToSystem
 805  *
 806  * Scheduler interface, this way we ensure that all "unsafe" events are
 807  * processed outside the scheduler.
 808  */
 809 void TASK_YieldToSystem(TDB* pTask)
 810 {
 811   MESSAGEQUEUE*         pQ;
 812
 813   if ( !THREAD_IsWin16( THREAD_Current() ) )
 814   {
 815     FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
 816     return;
 817   }
 818
 819   Callbacks->CallTaskRescheduleProc();
 820
 821   if( pTask )
 822   {
 823     pQ = (MESSAGEQUEUE*)GlobalLock16(pTask->hQueue);
 824     if( pQ && pQ->flags & QUEUE_FLAG_XEVENT &&
 825             !(pQ->wakeBits & (QS_SENDMESSAGE | QS_SMRESULT)) )
 826     {
 827       pQ->flags &= ~QUEUE_FLAG_XEVENT;
 828       EVENT_WaitNetEvent( FALSE, FALSE );
 829     }
 830   }
 831 }
 832
 833
 834 /***********************************************************************
 835  *           InitTask  (KERNEL.91)
 836  *
 837  * Called by the application startup code.
 838  */
 839 void WINAPI InitTask( CONTEXT *context )
 840 {
 841     TDB *pTask;
 842     NE_MODULE *pModule;
 843     SEGTABLEENTRY *pSegTable;
 844     INSTANCEDATA *pinstance;
 845     LONG stacklow, stackhi;
 846
 847     if (context) EAX_reg(context) = 0;
 848     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
 849     if (!(pModule = NE_GetPtr( pTask->hModule ))) return;
 850
 851     /* Initialize implicitly loaded DLLs */
 852     NE_InitializeDLLs( pTask->hModule );
 853
 854     if (context)
 855     {
 856         /* Registers on return are:
 857          * ax     1 if OK, 0 on error
 858          * cx     stack limit in bytes
 859          * dx     cmdShow parameter
 860          * si     instance handle of the previous instance
 861          * di     instance handle of the new task
 862          * es:bx  pointer to command-line inside PSP
 863          *
 864          * 0 (=%bp) is pushed on the stack
 865          */
 866         SEGPTR ptr = STACK16_PUSH( pTask->thdb, sizeof(WORD) );
 867         *(WORD *)PTR_SEG_TO_LIN(ptr) = 0;
 868         SP_reg(context) -= 2;
 869
 870         EAX_reg(context) = 1;
 871
 872         if (!pTask->pdb.cmdLine[0]) EBX_reg(context) = 0x80;
 873         else
 874         {
 875             LPBYTE p = &pTask->pdb.cmdLine[1];
 876             while ((*p == ' ') || (*p == '\t')) p++;
 877             EBX_reg(context) = 0x80 + (p - pTask->pdb.cmdLine);
 878         }
 879         ECX_reg(context) = pModule->stack_size;
 880         EDX_reg(context) = pTask->nCmdShow;
 881         ESI_reg(context) = (DWORD)pTask->hPrevInstance;
 882         EDI_reg(context) = (DWORD)pTask->hInstance;
 883         ES_reg (context) = (WORD)pTask->hPDB;
 884     }
 885
 886     /* Initialize the local heap */
 887     if ( pModule->heap_size )
 888     {
 889         LocalInit( pTask->hInstance, 0, pModule->heap_size );
 890     }
 891
 892     /* Initialize the INSTANCEDATA structure */
 893     pSegTable = NE_SEG_TABLE( pModule );
 894     stacklow = pSegTable[pModule->ss - 1].minsize;
 895     stackhi  = stacklow + pModule->stack_size;
 896     if (stackhi > 0xffff) stackhi = 0xffff;
 897     pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
 898     pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
 899     pinstance->stacktop    = stacklow;
 900     pinstance->stackmin    = OFFSETOF( pTask->thdb->cur_stack );
 901 }
 902
 903
 904 /***********************************************************************
 905  *           WaitEvent  (KERNEL.30)
 906  */
 907 BOOL16 WINAPI WaitEvent( HTASK16 hTask )
 908 {
 909     TDB *pTask;
 910
 911     if (!hTask) hTask = GetCurrentTask();
 912     pTask = (TDB *)GlobalLock16( hTask );
 913
 914     if ( !THREAD_IsWin16( THREAD_Current() ) )
 915     {
 916         FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
 917         return TRUE;
 918     }
 919
 920     if (pTask->nEvents > 0)
 921     {
 922         pTask->nEvents--;
 923         return FALSE;
 924     }
 925     TASK_YieldToSystem(pTask);
 926
 927     /* When we get back here, we have an event */
 928
 929     if (pTask->nEvents > 0) pTask->nEvents--;
 930     return TRUE;
 931 }
 932
 933
 934 /***********************************************************************
 935  *           PostEvent  (KERNEL.31)
 936  */
 937 void WINAPI PostEvent( HTASK16 hTask )
 938 {
 939     TDB *pTask;
 940
 941     if (!hTask) hTask = GetCurrentTask();
 942     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 943
 944     if ( !THREAD_IsWin16( THREAD_Current() ) )
 945     {
 946         WARN(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
 947         /* return; */
 948     }
 949
 950     pTask->nEvents++;
 951 }
 952
 953
 954 /***********************************************************************
 955  *           SetPriority  (KERNEL.32)
 956  */
 957 void WINAPI SetPriority( HTASK16 hTask, INT16 delta )
 958 {
 959     TDB *pTask;
 960     INT16 newpriority;
 961
 962     if (!hTask) hTask = GetCurrentTask();
 963     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 964     newpriority = pTask->priority + delta;
 965     if (newpriority < -32) newpriority = -32;
 966     else if (newpriority > 15) newpriority = 15;
 967
 968     pTask->priority = newpriority + 1;
 969     TASK_UnlinkTask( hTask );
 970     TASK_LinkTask( hTask );
 971     pTask->priority--;
 972 }
 973
 974
 975 /***********************************************************************
 976  *           LockCurrentTask  (KERNEL.33)
 977  */
 978 HTASK16 WINAPI LockCurrentTask( BOOL16 bLock )
 979 {
 980     if (bLock) hLockedTask = GetCurrentTask();
 981     else hLockedTask = 0;
 982     return hLockedTask;
 983 }
 984
 985
 986 /***********************************************************************
 987  *           IsTaskLocked  (KERNEL.122)
 988  */
 989 HTASK16 WINAPI IsTaskLocked(void)
 990 {
 991     return hLockedTask;
 992 }
 993
 994
 995 /***********************************************************************
 996  *           OldYield  (KERNEL.117)
 997  */
 998 void WINAPI OldYield(void)
 999 {
1000     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1001
1002     if ( !THREAD_IsWin16( THREAD_Current() ) )
1003     {
1004         FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1005         return;
1006     }
1007
1008     if (pCurTask) pCurTask->nEvents++;  /* Make sure we get back here */
1009     TASK_YieldToSystem(pCurTask);
1010     if (pCurTask) pCurTask->nEvents--;
1011 }
1012
1013
1014 /***********************************************************************
1015  *           DirectedYield  (KERNEL.150)
1016  */
1017 void WINAPI DirectedYield( HTASK16 hTask )
1018 {
1019     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1020
1021     if ( !THREAD_IsWin16( THREAD_Current() ) )
1022     {
1023         FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1024         return;
1025     }
1026
1027     TRACE(task, "%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
1028
1029     pCurTask->hYieldTo = hTask;
1030     OldYield();
1031
1032     TRACE(task, "%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
1033 }
1034
1035
1036 /***********************************************************************
1037  *           UserYield  (USER.332)
1038  */
1039 void WINAPI UserYield(void)
1040 {
1041     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1042     MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
1043
1044     if ( !THREAD_IsWin16( THREAD_Current() ) )
1045     {
1046         FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1047         return;
1048     }
1049
1050     /* Handle sent messages */
1051     while (queue && (queue->wakeBits & QS_SENDMESSAGE))
1052         QUEUE_ReceiveMessage( queue );
1053
1054     OldYield();
1055
1056     queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
1057     while (queue && (queue->wakeBits & QS_SENDMESSAGE))
1058         QUEUE_ReceiveMessage( queue );
1059 }
1060
1061
1062 /***********************************************************************
1063  *           Yield16  (KERNEL.29)
1064  */
1065 void WINAPI Yield16(void)
1066 {
1067     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1068
1069     if ( !THREAD_IsWin16( THREAD_Current() ) )
1070     {
1071         FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1072         return;
1073     }
1074
1075     if (pCurTask) pCurTask->hYieldTo = 0;
1076     if (pCurTask && pCurTask->hQueue) UserYield();
1077     else OldYield();
1078 }
1079
1080 /***********************************************************************
1081  *           KERNEL_490  (KERNEL.490)
1082  */
1083 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
1084 {
1085     if ( !someTask ) return 0;
1086
1087     FIXME( task, "(%04x): stub\n", someTask );
1088     return 0;
1089 }
1090
1091 /***********************************************************************
1092  *           MakeProcInstance16  (KERNEL.51)
1093  */
1094 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
1095 {
1096     BYTE *thunk,*lfunc;
1097     SEGPTR thunkaddr;
1098
1099     if (!func) {
1100       ERR(task, "Ouch ! MakeProcInstance called with func == NULL !\n");
1101       return (FARPROC16)0; /* Windows seems to do the same */
1102     }
1103     if (!hInstance) hInstance = CURRENT_DS;
1104     thunkaddr = TASK_AllocThunk( GetCurrentTask() );
1105     if (!thunkaddr) return (FARPROC16)0;
1106     thunk = PTR_SEG_TO_LIN( thunkaddr );
1107     lfunc = PTR_SEG_TO_LIN( func );
1108
1109     TRACE(task, "(%08lx,%04x): got thunk %08lx\n",
1110                   (DWORD)func, hInstance, (DWORD)thunkaddr );
1111     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) ||
1112         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))
1113     ) {
1114         FIXME(task,"thunk would be useless for %p, overwriting with nop;nop;\n", func );
1115         lfunc[0]=0x90; /* nop */
1116         lfunc[1]=0x90; /* nop */
1117     }
1118
1119     *thunk++ = 0xb8;    /* movw instance, %ax */
1120     *thunk++ = (BYTE)(hInstance & 0xff);
1121     *thunk++ = (BYTE)(hInstance >> 8);
1122     *thunk++ = 0xea;    /* ljmp func */
1123     *(DWORD *)thunk = (DWORD)func;
1124     return (FARPROC16)thunkaddr;
1125 }
1126
1127
1128 /***********************************************************************
1129  *           FreeProcInstance16  (KERNEL.52)
1130  */
1131 void WINAPI FreeProcInstance16( FARPROC16 func )
1132 {
1133     TRACE(task, "(%08lx)\n", (DWORD)func );
1134     TASK_FreeThunk( GetCurrentTask(), (SEGPTR)func );
1135 }
1136
1137
1138 /**********************************************************************
1139  *          GetCodeHandle    (KERNEL.93)
1140  */
1141 HANDLE16 WINAPI GetCodeHandle( FARPROC16 proc )
1142 {
1143     HANDLE16 handle;
1144     BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1145
1146     /* Return the code segment containing 'proc'. */
1147     /* Not sure if this is really correct (shouldn't matter that much). */
1148
1149     /* Check if it is really a thunk */
1150     if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1151         handle = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
1152     else
1153         handle = GlobalHandle16( HIWORD(proc) );
1154
1155     return handle;
1156 }
1157
1158 /**********************************************************************
1159  *          GetCodeInfo    (KERNEL.104)
1160  */
1161 VOID WINAPI GetCodeInfo( FARPROC16 proc, SEGINFO *segInfo )
1162 {
1163     BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1164     NE_MODULE *pModule = NULL;
1165     SEGTABLEENTRY *pSeg = NULL;
1166     WORD segNr;
1167
1168     /* proc is either a thunk, or else a pair of module handle
1169        and segment number. In the first case, we also need to
1170        extract module and segment number. */
1171
1172     if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1173     {
1174         WORD selector = thunk[6] + (thunk[7] << 8);
1175         pModule = NE_GetPtr( GlobalHandle16( selector ) );
1176         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
1177
1178         if ( pModule )
1179             for ( segNr = 0; segNr < pModule->seg_count; segNr++, pSeg++ )
1180                 if ( GlobalHandleToSel(pSeg->hSeg) == selector )
1181                     break;
1182
1183         if ( pModule && segNr >= pModule->seg_count )
1184             pSeg = NULL;
1185     }
1186     else
1187     {
1188         pModule = NE_GetPtr( HIWORD( proc ) );
1189         segNr   = LOWORD( proc );
1190
1191         if ( pModule && segNr < pModule->seg_count )
1192             pSeg = NE_SEG_TABLE( pModule ) + segNr;
1193     }
1194
1195     /* fill in segment information */
1196
1197     segInfo->offSegment = pSeg? pSeg->filepos : 0;
1198     segInfo->cbSegment  = pSeg? pSeg->size : 0;
1199     segInfo->flags      = pSeg? pSeg->flags : 0;
1200     segInfo->cbAlloc    = pSeg? pSeg->minsize : 0;
1201     segInfo->h          = pSeg? pSeg->hSeg : 0;
1202     segInfo->alignShift = pModule? pModule->alignment : 0;
1203 }
1204
1205
1206 /**********************************************************************
1207  *          DefineHandleTable16    (KERNEL.94)
1208  */
1209 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1210 {
1211     return TRUE;  /* FIXME */
1212 }
1213
1214
1215 /***********************************************************************
1216  *           SetTaskQueue  (KERNEL.34)
1217  */
1218 HQUEUE16 WINAPI SetTaskQueue( HTASK16 hTask, HQUEUE16 hQueue )
1219 {
1220     HQUEUE16 hPrev;
1221     TDB *pTask;
1222
1223     if (!hTask) hTask = GetCurrentTask();
1224     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1225
1226     hPrev = pTask->hQueue;
1227     pTask->hQueue = hQueue;
1228
1229     TIMER_SwitchQueue( hPrev, hQueue );
1230
1231     return hPrev;
1232 }
1233
1234
1235 /***********************************************************************
1236  *           GetTaskQueue  (KERNEL.35)
1237  */
1238 HQUEUE16 WINAPI GetTaskQueue( HTASK16 hTask )
1239 {
1240     TDB *pTask;
1241
1242     if (!hTask) hTask = GetCurrentTask();
1243     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1244     return pTask->hQueue;
1245 }
1246
1247 /***********************************************************************
1248  *           SetThreadQueue  (KERNEL.463)
1249  */
1250 HQUEUE16 WINAPI SetThreadQueue( DWORD thread, HQUEUE16 hQueue )
1251 {
1252     THDB *thdb = THREAD_IdToTHDB( thread );
1253     HQUEUE16 oldQueue = thdb? thdb->teb.queue : 0;
1254
1255     if ( thdb )
1256     {
1257         thdb->teb.queue = hQueue;
1258
1259         if ( GetTaskQueue( thdb->process->task ) == oldQueue )
1260             SetTaskQueue( thdb->process->task, hQueue );
1261     }
1262
1263     return oldQueue;
1264 }
1265
1266 /***********************************************************************
1267  *           GetThreadQueue  (KERNEL.464)
1268  */
1269 HQUEUE16 WINAPI GetThreadQueue( DWORD thread )
1270 {
1271     THDB *thdb = THREAD_IdToTHDB( thread );
1272     return (HQUEUE16)(thdb? thdb->teb.queue : 0);
1273 }
1274
1275 /***********************************************************************
1276  *           SetFastQueue  (KERNEL.624)
1277  */
1278 VOID WINAPI SetFastQueue( DWORD thread, HANDLE32 hQueue )
1279 {
1280     THDB *thdb = THREAD_IdToTHDB( thread );
1281     if ( thdb ) thdb->teb.queue = (HQUEUE16) hQueue;
1282 }
1283
1284 /***********************************************************************
1285  *           GetFastQueue  (KERNEL.625)
1286  */
1287 HANDLE32 WINAPI GetFastQueue( void )
1288 {
1289     THDB *thdb = THREAD_Current();
1290     if (!thdb) return 0;
1291
1292     if (!(thdb->teb.queue))
1293     {
1294         HMODULE16 hModule = GetModuleHandle16( "USER" );
1295         FARPROC16 proc = WIN32_GetProcAddress16( hModule, "InitThreadInput" );
1296         Callbacks->CallBootAppProc( proc, 0, THREAD_IsWin16(thdb)? 4 : 5 );  /* FIXME! */
1297     }
1298
1299     if (!(thdb->teb.queue))
1300         FIXME( task, "(): should initialize thread-local queue, expect failure!\n" );
1301
1302     return (HANDLE32)thdb->teb.queue;
1303 }
1304
1305 /***********************************************************************
1306  *           SwitchStackTo   (KERNEL.108)
1307  */
1308 void WINAPI SwitchStackTo( WORD seg, WORD ptr, WORD top )
1309 {
1310     TDB *pTask;
1311     STACK16FRAME *oldFrame, *newFrame;
1312     INSTANCEDATA *pData;
1313     UINT16 copySize;
1314
1315     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1316     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1317     TRACE(task, "old=%04x:%04x new=%04x:%04x\n",
1318                   SELECTOROF( pTask->thdb->cur_stack ),
1319                   OFFSETOF( pTask->thdb->cur_stack ), seg, ptr );
1320
1321     /* Save the old stack */
1322
1323     oldFrame = THREAD_STACK16( pTask->thdb );
1324     /* pop frame + args and push bp */
1325     pData->old_ss_sp   = pTask->thdb->cur_stack + sizeof(STACK16FRAME)
1326                            + 2 * sizeof(WORD);
1327     *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp) = oldFrame->bp;
1328     pData->stacktop    = top;
1329     pData->stackmin    = ptr;
1330     pData->stackbottom = ptr;
1331
1332     /* Switch to the new stack */
1333
1334     /* Note: we need to take the 3 arguments into account; otherwise,
1335      * the stack will underflow upon return from this function.
1336      */
1337     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1338     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1339     pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg, ptr - copySize );
1340     newFrame = THREAD_STACK16( pTask->thdb );
1341
1342     /* Copy the stack frame and the local variables to the new stack */
1343
1344     memmove( newFrame, oldFrame, copySize );
1345     newFrame->bp = ptr;
1346     *(WORD *)PTR_SEG_OFF_TO_LIN( seg, ptr ) = 0;  /* clear previous bp */
1347 }
1348
1349
1350 /***********************************************************************
1351  *           SwitchStackBack   (KERNEL.109)
1352  */
1353 void WINAPI SwitchStackBack( CONTEXT *context )
1354 {
1355     TDB *pTask;
1356     STACK16FRAME *oldFrame, *newFrame;
1357     INSTANCEDATA *pData;
1358
1359     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1360     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(pTask->thdb->cur_stack))))
1361         return;
1362     if (!pData->old_ss_sp)
1363     {
1364         WARN( task, "No previous SwitchStackTo\n" );
1365         return;
1366     }
1367     TRACE(task, "restoring stack %04x:%04x\n",
1368                  SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1369
1370     oldFrame = THREAD_STACK16( pTask->thdb );
1371
1372     /* Pop bp from the previous stack */
1373
1374     BP_reg(context) = *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp);
1375     pData->old_ss_sp += sizeof(WORD);
1376
1377     /* Switch back to the old stack */
1378
1379     pTask->thdb->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1380     SS_reg(context)  = SELECTOROF(pData->old_ss_sp);
1381     ESP_reg(context) = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1382     pData->old_ss_sp = 0;
1383
1384     /* Build a stack frame for the return */
1385
1386     newFrame = THREAD_STACK16( pTask->thdb );
1387     newFrame->frame32 = oldFrame->frame32;
1388     if (TRACE_ON(relay))
1389     {
1390         newFrame->entry_ip = oldFrame->entry_ip;
1391         newFrame->entry_cs = oldFrame->entry_cs;
1392     }
1393 }
1394
1395
1396 /***********************************************************************
1397  *           GetTaskQueueDS  (KERNEL.118)
1398  */
1399 void WINAPI GetTaskQueueDS( CONTEXT *context )
1400 {
1401     DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1402 }
1403
1404
1405 /***********************************************************************
1406  *           GetTaskQueueES  (KERNEL.119)
1407  */
1408 void WINAPI GetTaskQueueES( CONTEXT *context )
1409 {
1410     ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1411 }
1412
1413
1414 /***********************************************************************
1415  *           GetCurrentTask   (KERNEL.36)
1416  */
1417 HTASK16 WINAPI GetCurrentTask(void)
1418 {
1419     return THREAD_InitDone? PROCESS_Current()->task : 0;
1420 }
1421
1422 DWORD WINAPI WIN16_GetCurrentTask(void)
1423 {
1424     /* This is the version used by relay code; the first task is */
1425     /* returned in the high word of the result */
1426     return MAKELONG( GetCurrentTask(), hFirstTask );
1427 }
1428
1429
1430 /***********************************************************************
1431  *           GetCurrentPDB   (KERNEL.37)
1432  *
1433  * UNDOC: returns PSP of KERNEL in high word
1434  */
1435 DWORD WINAPI GetCurrentPDB(void)
1436 {
1437     TDB *pTask;
1438
1439     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1440     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1441 }
1442
1443
1444 /***********************************************************************
1445  *           GetInstanceData   (KERNEL.54)
1446  */
1447 INT16 WINAPI GetInstanceData( HINSTANCE16 instance, WORD buffer, INT16 len )
1448 {
1449     char *ptr = (char *)GlobalLock16( instance );
1450     if (!ptr || !len) return 0;
1451     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1452     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1453     return len;
1454 }
1455
1456
1457 /***********************************************************************
1458  *           GetExeVersion   (KERNEL.105)
1459  */
1460 WORD WINAPI GetExeVersion(void)
1461 {
1462     TDB *pTask;
1463
1464     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1465     return pTask->version;
1466 }
1467
1468
1469 /***********************************************************************
1470  *           SetErrorMode16   (KERNEL.107)
1471  */
1472 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1473 {
1474     TDB *pTask;
1475     UINT16 oldMode;
1476
1477     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1478     oldMode = pTask->error_mode;
1479     pTask->error_mode = mode;
1480     pTask->thdb->process->error_mode = mode;
1481     return oldMode;
1482 }
1483
1484
1485 /***********************************************************************
1486  *           SetErrorMode32   (KERNEL32.486)
1487  */
1488 UINT32 WINAPI SetErrorMode32( UINT32 mode )
1489 {
1490     return SetErrorMode16( (UINT16)mode );
1491 }
1492
1493
1494 /***********************************************************************
1495  *           GetDOSEnvironment   (KERNEL.131)
1496  */
1497 SEGPTR WINAPI GetDOSEnvironment(void)
1498 {
1499     TDB *pTask;
1500
1501     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1502     return PTR_SEG_OFF_TO_SEGPTR( pTask->pdb.environment, 0 );
1503 }
1504
1505
1506 /***********************************************************************
1507  *           GetNumTasks   (KERNEL.152)
1508  */
1509 UINT16 WINAPI GetNumTasks(void)
1510 {
1511     return nTaskCount;
1512 }
1513
1514
1515 /***********************************************************************
1516  *           GetTaskDS   (KERNEL.155)
1517  *
1518  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1519  * I don't think we need to bother with this.
1520  */
1521 HINSTANCE16 WINAPI GetTaskDS(void)
1522 {
1523     TDB *pTask;
1524
1525     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1526     return pTask->hInstance;
1527 }
1528
1529 /***********************************************************************
1530  *           GetDummyModuleHandleDS   (KERNEL.602)
1531  */
1532 VOID WINAPI GetDummyModuleHandleDS( CONTEXT *context )
1533 {
1534     TDB *pTask;
1535     WORD selector;
1536
1537     AX_reg( context ) = 0;
1538     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1539     if (!(pTask->flags & TDBF_WIN32)) return;
1540
1541     selector = GlobalHandleToSel( pTask->hModule );
1542     DS_reg( context ) = selector;
1543     AX_reg( context ) = selector;
1544 }
1545
1546 /***********************************************************************
1547  *           IsTask   (KERNEL.320)
1548  */
1549 BOOL16 WINAPI IsTask( HTASK16 hTask )
1550 {
1551     TDB *pTask;
1552
1553     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1554     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1555     return (pTask->magic == TDB_MAGIC);
1556 }
1557
1558
1559 /***********************************************************************
1560  *           SetTaskSignalProc   (KERNEL.38)
1561  *
1562  * Real 16-bit interface is provided by the THUNK_SetTaskSignalProc.
1563  */
1564 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1565 {
1566     TDB *pTask;
1567     FARPROC16 oldProc;
1568
1569     if (!hTask) hTask = GetCurrentTask();
1570     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
1571     oldProc = (FARPROC16)pTask->userhandler;
1572     pTask->userhandler = (USERSIGNALPROC)proc;
1573     return oldProc;
1574 }
1575
1576
1577 /***********************************************************************
1578  *           SetSigHandler   (KERNEL.140)
1579  */
1580 WORD WINAPI SetSigHandler( FARPROC16 newhandler, FARPROC16* oldhandler,
1581                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1582 {
1583     FIXME(task,"(%p,%p,%p,%d,%d), unimplemented.\n",
1584           newhandler,oldhandler,oldmode,newmode,flag );
1585
1586     if (flag != 1) return 0;
1587     if (!newmode) newhandler = NULL;  /* Default handler */
1588     if (newmode != 4)
1589     {
1590         TDB *pTask;
1591
1592         if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1593         if (oldmode) *oldmode = pTask->signal_flags;
1594         pTask->signal_flags = newmode;
1595         if (oldhandler) *oldhandler = pTask->sighandler;
1596         pTask->sighandler = newhandler;
1597     }
1598     return 0;
1599 }
1600
1601
1602 /***********************************************************************
1603  *           GlobalNotify   (KERNEL.154)
1604  *
1605  * Note that GlobalNotify does _not_ return the old NotifyProc
1606  * -- contrary to LocalNotify !!
1607  */
1608 VOID WINAPI GlobalNotify( FARPROC16 proc )
1609 {
1610     TDB *pTask;
1611
1612     if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1613     pTask->discardhandler = proc;
1614 }
1615
1616
1617 /***********************************************************************
1618  *           GetExePtr   (KERNEL.133)
1619  */
1620 static HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1621 {
1622     char *ptr;
1623     HANDLE16 owner;
1624
1625       /* Check for module handle */
1626
1627     if (!(ptr = GlobalLock16( handle ))) return 0;
1628     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1629
1630       /* Search for this handle inside all tasks */
1631
1632     *hTask = hFirstTask;
1633     while (*hTask)
1634     {
1635         TDB *pTask = (TDB *)GlobalLock16( *hTask );
1636         if ((*hTask == handle) ||
1637             (pTask->hInstance == handle) ||
1638             (pTask->hQueue == handle) ||
1639             (pTask->hPDB == handle)) return pTask->hModule;
1640         *hTask = pTask->hNext;
1641     }
1642
1643       /* Check the owner for module handle */
1644
1645     owner = FarGetOwner( handle );
1646     if (!(ptr = GlobalLock16( owner ))) return 0;
1647     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1648
1649       /* Search for the owner inside all tasks */
1650
1651     *hTask = hFirstTask;
1652     while (*hTask)
1653     {
1654         TDB *pTask = (TDB *)GlobalLock16( *hTask );
1655         if ((*hTask == owner) ||
1656             (pTask->hInstance == owner) ||
1657             (pTask->hQueue == owner) ||
1658             (pTask->hPDB == owner)) return pTask->hModule;
1659         *hTask = pTask->hNext;
1660     }
1661
1662     return 0;
1663 }
1664
1665 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1666 {
1667     HTASK16 dummy;
1668     return GetExePtrHelper( handle, &dummy );
1669 }
1670
1671 void WINAPI WIN16_GetExePtr( CONTEXT *context )
1672 {
1673     WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1674     HANDLE16 handle = (HANDLE16)stack[2];
1675     HTASK16 hTask = 0;
1676     HMODULE16 hModule;
1677
1678     hModule = GetExePtrHelper( handle, &hTask );
1679
1680     AX_reg(context) = CX_reg(context) = hModule;
1681     if (hTask) ES_reg(context) = hTask;
1682 }
1683
1684 /***********************************************************************
1685  *           TaskFirst   (TOOLHELP.63)
1686  */
1687 BOOL16 WINAPI TaskFirst( TASKENTRY *lpte )
1688 {
1689     lpte->hNext = hFirstTask;
1690     return TaskNext( lpte );
1691 }
1692
1693
1694 /***********************************************************************
1695  *           TaskNext   (TOOLHELP.64)
1696  */
1697 BOOL16 WINAPI TaskNext( TASKENTRY *lpte )
1698 {
1699     TDB *pTask;
1700     INSTANCEDATA *pInstData;
1701
1702     TRACE(toolhelp, "(%p): task=%04x\n", lpte, lpte->hNext );
1703     if (!lpte->hNext) return FALSE;
1704     pTask = (TDB *)GlobalLock16( lpte->hNext );
1705     if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1706     pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
1707     lpte->hTask         = lpte->hNext;
1708     lpte->hTaskParent   = pTask->hParent;
1709     lpte->hInst         = pTask->hInstance;
1710     lpte->hModule       = pTask->hModule;
1711     lpte->wSS           = SELECTOROF( pTask->thdb->cur_stack );
1712     lpte->wSP           = OFFSETOF( pTask->thdb->cur_stack );
1713     lpte->wStackTop     = pInstData->stacktop;
1714     lpte->wStackMinimum = pInstData->stackmin;
1715     lpte->wStackBottom  = pInstData->stackbottom;
1716     lpte->wcEvents      = pTask->nEvents;
1717     lpte->hQueue        = pTask->hQueue;
1718     strncpy( lpte->szModule, pTask->module_name, 8 );
1719     lpte->szModule[8]   = '\0';
1720     lpte->wPSPOffset    = 0x100;  /*??*/
1721     lpte->hNext         = pTask->hNext;
1722     return TRUE;
1723 }
1724
1725
1726 /***********************************************************************
1727  *           TaskFindHandle   (TOOLHELP.65)
1728  */
1729 BOOL16 WINAPI TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
1730 {
1731     lpte->hNext = hTask;
1732     return TaskNext( lpte );
1733 }
1734
1735
1736 /***********************************************************************
1737  *           GetAppCompatFlags16   (KERNEL.354)
1738  */
1739 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1740 {
1741     return GetAppCompatFlags32( hTask );
1742 }
1743
1744
1745 /***********************************************************************
1746  *           GetAppCompatFlags32   (USER32.206)
1747  */
1748 DWORD WINAPI GetAppCompatFlags32( HTASK32 hTask )
1749 {
1750     TDB *pTask;
1751
1752     if (!hTask) hTask = GetCurrentTask();
1753     if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
1754     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1755     return pTask->compat_flags;
1756 }