4 * Copyright 1995 Alexandre Julliard
21 #include "selectors.h"
27 /* Min. number of thunks allocated when creating a new segment */
30 /* 32-bit stack size for each task */
31 /* Must not be greater than 64k, or MAKE_SEGPTR won't work */
32 #define STACK32_SIZE 0x10000
35 static HTASK hFirstTask = 0;
36 static HTASK hCurrentTask = 0;
37 static HTASK hTaskToKill = 0;
38 static HTASK hLockedTask = 0;
39 static WORD nTaskCount = 0;
40 static HANDLE hDOSEnvironment = 0;
42 /* TASK_Reschedule() 16-bit entry point */
43 static FARPROC TASK_RescheduleProc;
45 #define TASK_SCHEDULE() CallTo16_word_(TASK_RescheduleProc,0)
48 static HANDLE TASK_CreateDOSEnvironment(void);
51 /***********************************************************************
56 TASK_RescheduleProc = (FARPROC)GetWndProcEntry16( "TASK_Reschedule" );
57 if (!(hDOSEnvironment = TASK_CreateDOSEnvironment()))
58 fprintf( stderr, "Not enough memory for DOS Environment\n" );
59 return (hDOSEnvironment != 0);
63 /***********************************************************************
64 * TASK_CreateDOSEnvironment
66 * Create the original DOS environment.
68 static HANDLE TASK_CreateDOSEnvironment(void)
70 static const char program_name[] = "KRNL386.EXE";
72 int initial_size, size;
75 extern char **environ;
76 extern char WindowsDirectory[], SystemDirectory[];
78 /* DOS environment format:
87 * ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
90 /* First compute the size of the fixed part of the environment */
92 initial_size = 5 + /* PATH= */
93 strlen(WindowsPath) + 1 + /* path value */
95 strlen(WindowsDirectory) + 1 + /* windir value */
96 1 + /* BYTE 0 at end */
97 sizeof(WORD) + /* WORD 1 */
98 strlen(SystemDirectory) + 1 + /* program directory */
99 strlen(program_name) + 1; /* program name */
101 /* Compute the total size of the Unix environment (except path) */
103 for (e = environ, size = initial_size; *e; e++)
105 if (strncasecmp(*e, "path=", 5))
107 int len = strlen(*e) + 1;
108 if (size + len >= 32767)
110 fprintf( stderr, "Warning: environment larger than 32k.\n" );
118 /* Now allocate the environment */
120 if (!(handle = GlobalAlloc( GMEM_FIXED, size ))) return 0;
121 p = (char *)GlobalLock( handle );
123 /* And fill it with the Unix environment */
125 for (e = environ, size = initial_size; *e; e++)
127 if (strncasecmp(*e, "path=", 5))
129 int len = strlen(*e) + 1;
130 if (size + len >= 32767) break;
137 /* Now add the path and Windows directory */
139 strcpy( p, "PATH=" );
140 strcat( p, WindowsPath );
143 strcpy( p, "windir=" );
144 strcat( p, WindowsDirectory );
147 /* Now add the program name */
152 strcpy( p, SystemDirectory );
154 strcat( p, program_name );
158 p = (char *) GlobalLock( handle );
159 dprintf_task(stddeb, "Master DOS environment at %p\n", p);
160 for (; *p; p += strlen(p) + 1) dprintf_task(stddeb, " %s\n", p);
161 dprintf_task( stddeb, "Progname: %s\n", p+3 );
167 /***********************************************************************
170 static void TASK_LinkTask( HTASK hTask )
175 if (!(pTask = (TDB *)GlobalLock( hTask ))) return;
176 prevTask = &hFirstTask;
179 TDB *prevTaskPtr = (TDB *)GlobalLock( *prevTask );
180 if (prevTaskPtr->priority >= pTask->priority) break;
181 prevTask = &prevTaskPtr->hNext;
183 pTask->hNext = *prevTask;
189 /***********************************************************************
192 static void TASK_UnlinkTask( HTASK hTask )
197 prevTask = &hFirstTask;
198 while (*prevTask && (*prevTask != hTask))
200 pTask = (TDB *)GlobalLock( *prevTask );
201 prevTask = &pTask->hNext;
205 pTask = (TDB *)GlobalLock( *prevTask );
206 *prevTask = pTask->hNext;
213 /***********************************************************************
216 * Create a thunk free-list in segment 'handle', starting from offset 'offset'
217 * and containing 'count' entries.
219 static void TASK_CreateThunks( HGLOBAL handle, WORD offset, WORD count )
225 pThunk = (THUNKS *)((BYTE *)GlobalLock( handle ) + offset);
227 pThunk->magic = THUNK_MAGIC;
228 pThunk->free = (int)&pThunk->thunks - (int)pThunk;
230 for (i = 0; i < count-1; i++)
232 free += 8; /* Offset of next thunk */
233 pThunk->thunks[4*i] = free;
235 pThunk->thunks[4*i] = 0; /* Last thunk */
239 /***********************************************************************
242 * Allocate a thunk for MakeProcInstance().
244 static SEGPTR TASK_AllocThunk( HTASK hTask )
250 if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0;
251 sel = pTask->hCSAlias;
252 pThunk = &pTask->thunks;
253 base = (int)pThunk - (int)pTask;
254 while (!pThunk->free)
257 if (!sel) /* Allocate a new segment */
259 sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
260 pTask->hPDB, TRUE, FALSE, FALSE );
261 if (!sel) return (SEGPTR)0;
262 TASK_CreateThunks( sel, 0, MIN_THUNKS );
265 pThunk = (THUNKS *)GlobalLock( sel );
268 base += pThunk->free;
269 pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
270 return MAKELONG( base, sel );
274 /***********************************************************************
277 * Free a MakeProcInstance() thunk.
279 static BOOL TASK_FreeThunk( HTASK hTask, SEGPTR thunk )
285 if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0;
286 sel = pTask->hCSAlias;
287 pThunk = &pTask->thunks;
288 base = (int)pThunk - (int)pTask;
289 while (sel && (sel != HIWORD(thunk)))
292 pThunk = (THUNKS *)GlobalLock( sel );
295 if (!sel) return FALSE;
296 *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
297 pThunk->free = LOWORD(thunk) - base;
302 /***********************************************************************
305 * 32-bit entry point for a new task. This function is responsible for
306 * setting up the registers and jumping to the 16-bit entry point.
308 static void TASK_CallToStart(void)
310 int cs_reg, ds_reg, ip_reg;
311 TDB *pTask = (TDB *)GlobalLock( hCurrentTask );
312 NE_MODULE *pModule = (NE_MODULE *)GlobalLock( pTask->hModule );
313 SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
315 /* Registers at initialization must be:
317 * bx stack size in bytes
318 * cx heap size in bytes
319 * si previous app instance
320 * di current app instance
322 * es selector to the PSP
323 * ds dgroup of the application
325 * sp top of the stack
328 cs_reg = pSegTable[pModule->cs - 1].selector;
329 ip_reg = pModule->ip;
330 ds_reg = pSegTable[pModule->dgroup - 1].selector;
331 IF1632_Saved16_ss = pTask->ss;
332 IF1632_Saved16_sp = pTask->sp;
333 dprintf_task( stddeb, "Starting main program: cs:ip=%04x:%04x ds=%04x ss:sp=%04x:%04x\n",
334 cs_reg, ip_reg, ds_reg,
335 IF1632_Saved16_ss, IF1632_Saved16_sp);
337 CallTo16_regs_( (FARPROC)(cs_reg << 16 | ip_reg), ds_reg,
338 pTask->hPDB /*es*/, 0 /*bp*/, 0 /*ax*/,
339 pModule->stack_size /*bx*/, pModule->heap_size /*cx*/,
340 0 /*dx*/, 0 /*si*/, ds_reg /*di*/ );
341 /* This should never return */
342 fprintf( stderr, "TASK_CallToStart: Main program returned!\n" );
343 TASK_KillCurrentTask( 1 );
347 /***********************************************************************
350 HTASK TASK_CreateTask( HMODULE hModule, HANDLE hInstance, HANDLE hPrevInstance,
351 HANDLE hEnvironment, char *cmdLine, WORD cmdShow )
357 SEGTABLEENTRY *pSegTable;
359 char *stack16Top, *stack32Top;
360 STACK16FRAME *frame16;
361 STACK32FRAME *frame32;
362 extern DWORD CALL16_RetAddr_word;
365 if (!(pModule = (NE_MODULE *)GlobalLock( hModule ))) return 0;
366 pSegTable = NE_SEG_TABLE( pModule );
368 /* Allocate the task structure */
370 hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
371 hModule, FALSE, FALSE, FALSE );
372 if (!hTask) return 0;
373 pTask = (TDB *)GlobalLock( hTask );
375 /* Allocate the new environment block */
377 if (!(hParentEnv = hEnvironment))
379 TDB *pParent = (TDB *)GlobalLock( hCurrentTask );
380 hParentEnv = pParent ? pParent->pdb.environment : hDOSEnvironment;
382 /* FIXME: do we really need to make a copy also when */
383 /* we don't use the parent environment? */
384 if (!(hEnvironment = GlobalAlloc( GMEM_FIXED, GlobalSize( hParentEnv ) )))
389 memcpy( GlobalLock( hEnvironment ), GlobalLock( hParentEnv ),
390 GlobalSize( hParentEnv ) );
392 /* Get current directory */
394 GetModuleFileName( hModule, filename, sizeof(filename) );
395 name = strrchr(filename, '\\');
396 if (name) *(name+1) = 0;
398 /* Fill the task structure */
400 pTask->nEvents = 1; /* So the task can be started */
401 pTask->hSelf = hTask;
403 pTask->version = pModule->expected_version;
404 pTask->hInstance = hInstance;
405 pTask->hPrevInstance = hPrevInstance;
406 pTask->hModule = hModule;
407 pTask->hParent = hCurrentTask;
408 pTask->curdrive = filename[0] - 'A' + 0x80;
409 pTask->magic = TDB_MAGIC;
410 pTask->nCmdShow = cmdShow;
411 strcpy( pTask->curdir, filename+2 );
413 /* Create the thunks block */
415 TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
417 /* Copy the module name */
419 name = MODULE_GetModuleName( hModule );
420 strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
424 pTask->pdb.int20 = 0x20cd;
425 pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
426 *(DWORD *)&pTask->pdb.dispatcher[1] = MODULE_GetEntryPoint( GetModuleHandle("KERNEL"), 102 ); /* KERNEL.102 is DOS3Call() */
427 pTask->pdb.savedint22 = INT_GetHandler( 0x22 );
428 pTask->pdb.savedint23 = INT_GetHandler( 0x23 );
429 pTask->pdb.savedint24 = INT_GetHandler( 0x24 );
430 pTask->pdb.environment = hEnvironment;
431 strncpy( pTask->pdb.cmdLine + 1, cmdLine, 126 );
432 pTask->pdb.cmdLine[127] = '\0';
433 pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 );
435 /* Get the compatibility flags */
437 pTask->compat_flags = GetProfileInt( name, "Compatibility", 0 );
439 /* Allocate a selector for the PDB */
441 pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
442 hModule, FALSE, FALSE, FALSE, NULL );
444 /* Allocate a code segment alias for the TDB */
446 pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
447 sizeof(TDB), pTask->hPDB, TRUE,
448 FALSE, FALSE, NULL );
450 /* Set the owner of the environment block */
452 FarSetOwner( pTask->pdb.environment, pTask->hPDB );
454 /* Default DTA overwrites command-line */
456 pTask->dta = MAKELONG( (int)&pTask->pdb.cmdLine - (int)&pTask->pdb,
459 /* Allocate the 32-bit stack */
461 pTask->hStack32 = GLOBAL_Alloc( GMEM_FIXED, STACK32_SIZE, pTask->hPDB,
462 FALSE, FALSE, FALSE );
464 /* Create the 32-bit stack frame */
466 *(DWORD *)GlobalLock(pTask->hStack32) = 0xDEADBEEF;
467 stack32Top = (char*)GlobalLock(pTask->hStack32) + STACK32_SIZE;
468 frame32 = (STACK32FRAME *)stack32Top - 1;
469 frame32->saved_esp = (DWORD)stack32Top;
476 frame32->retaddr = (DWORD)TASK_CallToStart;
477 frame32->codeselector = WINE_CODE_SELECTOR;
478 pTask->esp = (DWORD)frame32;
480 /* Create the 16-bit stack frame */
482 pTask->ss = hInstance;
483 pTask->sp = ((pModule->sp != 0) ? pModule->sp :
484 pSegTable[pModule->ss-1].minsize + pModule->stack_size) & ~1;
485 stack16Top = (char *)PTR_SEG_OFF_TO_LIN( pTask->ss, pTask->sp );
486 frame16 = (STACK16FRAME *)stack16Top - 1;
487 frame16->saved_ss = 0; /*pTask->ss;*/
488 frame16->saved_sp = 0; /*pTask->sp;*/
489 frame16->ds = frame16->es = pTask->hInstance;
490 frame16->entry_point = 0;
491 frame16->ordinal_number = 24; /* WINPROCS.24 is TASK_Reschedule */
492 frame16->dll_id = 24; /* WINPROCS */
494 frame16->ip = LOWORD( CALL16_RetAddr_word );
495 frame16->cs = HIWORD( CALL16_RetAddr_word );
496 pTask->sp -= sizeof(STACK16FRAME);
498 /* If there's no 16-bit stack yet, use a part of the new task stack */
499 /* This is only needed to have a stack to switch from on the first */
500 /* call to DirectedYield(). */
502 if (!IF1632_Saved16_ss)
504 IF1632_Saved16_ss = pTask->ss;
505 IF1632_Saved16_sp = pTask->sp;
508 /* Add a breakpoint at the start of the task */
512 DBG_ADDR addr = { pSegTable[pModule->cs-1].selector, pModule->ip };
513 fprintf( stderr, "Task '%s': ", name );
514 DEBUG_AddBreakpoint( &addr );
517 /* Add the task to the linked list */
519 TASK_LinkTask( hTask );
521 dprintf_task( stddeb, "CreateTask: module='%s' cmdline='%s' task=%04x\n",
522 name, cmdLine, hTask );
528 /***********************************************************************
531 static void TASK_DeleteTask( HTASK hTask )
535 if (!(pTask = (TDB *)GlobalLock( hTask ))) return;
537 /* Free the task module */
539 FreeModule( pTask->hModule );
541 /* Free all memory used by this task (including the 32-bit stack, */
542 /* the environment block and the thunk segments). */
544 GlobalFreeAll( pTask->hPDB );
546 /* Free the selector aliases */
548 GLOBAL_FreeBlock( pTask->hCSAlias );
549 GLOBAL_FreeBlock( pTask->hPDB );
551 /* Free the task structure itself */
557 /***********************************************************************
558 * TASK_KillCurrentTask
560 * Kill the currently running task. As it's not possible to kill the
561 * current task like this, it is simply marked for destruction, and will
562 * be killed when either TASK_Reschedule or this function is called again
563 * in the context of another task.
565 void TASK_KillCurrentTask( int exitCode )
567 if (hTaskToKill && (hTaskToKill != hCurrentTask))
569 /* If another task is already marked for destruction, */
570 /* we call kill it now, as we are in another context. */
571 TASK_DeleteTask( hTaskToKill );
576 dprintf_task( stddeb, "Killing the last task, exiting\n" );
580 /* Remove the task from the list to be sure we never switch back to it */
581 TASK_UnlinkTask( hCurrentTask );
583 hTaskToKill = hCurrentTask;
586 /* We never return from Yield() */
590 /***********************************************************************
593 * This is where all the magic of task-switching happens!
595 * This function should only be called via the TASK_SCHEDULE() macro, to make
596 * sure that all the context is saved correctly.
598 void TASK_Reschedule(void)
600 TDB *pOldTask = NULL, *pNewTask;
606 /* First check if there's a task to kill */
608 if (hTaskToKill && (hTaskToKill != hCurrentTask))
610 TASK_DeleteTask( hTaskToKill );
614 /* If current task is locked, simply return */
616 if (hLockedTask) return;
618 /* Find a task to yield to */
620 pOldTask = (TDB *)GlobalLock( hCurrentTask );
621 if (pOldTask && pOldTask->hYieldTo)
623 /* If a task is stored in hYieldTo of the current task (put there */
624 /* by DirectedYield), yield to it only if it has events pending. */
625 hTask = pOldTask->hYieldTo;
626 if (!(pNewTask = (TDB *)GlobalLock( hTask )) || !pNewTask->nEvents)
635 pNewTask = (TDB *)GlobalLock( hTask );
636 if (pNewTask->nEvents && (hTask != hCurrentTask)) break;
637 hTask = pNewTask->hNext;
641 /* If there's a task to kill, switch to any other task, */
642 /* even if it doesn't have events pending. */
644 if (!hTask && hTaskToKill) hTask = hFirstTask;
646 if (!hTask) return; /* Do nothing */
648 pNewTask = (TDB *)GlobalLock( hTask );
649 dprintf_task( stddeb, "Switching to task %04x (%.8s)\n",
650 hTask, pNewTask->module_name );
652 /* Save the stacks of the previous task (if any) */
656 pOldTask->ss = IF1632_Saved16_ss;
657 pOldTask->sp = IF1632_Saved16_sp;
658 pOldTask->esp = IF1632_Saved32_esp;
660 else IF1632_Original32_esp = IF1632_Saved32_esp;
662 /* Make the task the last in the linked list (round-robin scheduling) */
664 pNewTask->priority++;
665 TASK_UnlinkTask( hTask );
666 TASK_LinkTask( hTask );
667 pNewTask->priority--;
669 /* Switch to the new stack */
671 hCurrentTask = hTask;
672 IF1632_Saved16_ss = pNewTask->ss;
673 IF1632_Saved16_sp = pNewTask->sp;
674 IF1632_Saved32_esp = pNewTask->esp;
675 IF1632_Stack32_base = WIN16_GlobalLock( pNewTask->hStack32 );
679 /***********************************************************************
680 * InitTask (KERNEL.91)
682 void InitTask( struct sigcontext_struct context )
684 static int firstTask = 1;
687 SEGTABLEENTRY *pSegTable;
688 INSTANCEDATA *pinstance;
689 LONG stacklow, stackhi;
692 if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return;
693 if (!(pModule = (NE_MODULE *)GlobalLock( pTask->hModule ))) return;
697 extern BOOL WIDGETS_Init(void);
698 extern BOOL WIN_CreateDesktopWindow(void);
700 /* Perform global initialisations that need a task context */
702 /* Initialize built-in window classes */
703 if (!WIDGETS_Init()) return;
705 /* Create desktop window */
706 if (!WIN_CreateDesktopWindow()) return;
711 NE_InitializeDLLs( pTask->hModule );
713 /* Registers on return are:
714 * ax 1 if OK, 0 on error
715 * cx stack limit in bytes
716 * dx cmdShow parameter
717 * si instance handle of the previous instance
718 * di instance handle of the new task
719 * es:bx pointer to command-line inside PSP
722 context.sc_ebx = 0x81;
723 context.sc_ecx = pModule->stack_size;
724 context.sc_edx = pTask->nCmdShow;
725 context.sc_esi = pTask->hPrevInstance;
726 context.sc_edi = pTask->hInstance;
727 context.sc_es = pTask->hPDB;
729 /* Initialize the local heap */
730 if ( pModule->heap_size )
732 LocalInit( pTask->hInstance, 0, pModule->heap_size );
736 /* Initialize the INSTANCEDATA structure */
737 pSegTable = NE_SEG_TABLE( pModule );
738 stacklow = pSegTable[pModule->ss - 1].minsize;
739 stackhi = stacklow + pModule->stack_size;
740 if (stackhi > 0xffff) stackhi = 0xffff;
741 pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
742 pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
743 pinstance->stacktop = stacklow;
744 pinstance->stackmin = IF1632_Saved16_sp;
748 /***********************************************************************
749 * WaitEvent (KERNEL.30)
751 BOOL WaitEvent( HTASK hTask )
755 if (!hTask) hTask = hCurrentTask;
756 pTask = (TDB *)GlobalLock( hTask );
757 if (pTask->nEvents > 0)
763 /* When we get back here, we have an event (or the task is the only one) */
764 if (pTask->nEvents > 0) pTask->nEvents--;
769 /***********************************************************************
770 * PostEvent (KERNEL.31)
772 void PostEvent( HTASK hTask )
776 if (!hTask) hTask = hCurrentTask;
777 if (!(pTask = (TDB *)GlobalLock( hTask ))) return;
782 /***********************************************************************
783 * SetPriority (KERNEL.32)
785 void SetPriority( HTASK hTask, int delta )
790 if (!hTask) hTask = hCurrentTask;
791 if (!(pTask = (TDB *)GlobalLock( hTask ))) return;
792 newpriority = pTask->priority + delta;
793 if (newpriority < -32) newpriority = -32;
794 else if (newpriority > 15) newpriority = 15;
796 pTask->priority = newpriority + 1;
797 TASK_UnlinkTask( hTask );
798 TASK_LinkTask( hTask );
803 /***********************************************************************
804 * LockCurrentTask (KERNEL.33)
806 HTASK LockCurrentTask( BOOL bLock )
808 if (bLock) hLockedTask = hCurrentTask;
809 else hLockedTask = 0;
814 /***********************************************************************
815 * IsTaskLocked (KERNEL.122)
817 WORD IsTaskLocked(void)
823 /***********************************************************************
824 * OldYield (KERNEL.117)
830 pCurTask = (TDB *)GlobalLock( hCurrentTask );
831 if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */
833 if (pCurTask) pCurTask->nEvents--;
837 /***********************************************************************
838 * DirectedYield (KERNEL.150)
840 void DirectedYield( HTASK hTask )
844 if ((pCurTask = (TDB *)GlobalLock( hCurrentTask )) != NULL)
845 pCurTask->hYieldTo = hTask;
851 /***********************************************************************
860 /***********************************************************************
861 * MakeProcInstance (KERNEL.51)
863 FARPROC MakeProcInstance( FARPROC func, HANDLE hInstance )
868 thunkaddr = TASK_AllocThunk( hCurrentTask );
869 if (!thunkaddr) return (FARPROC)0;
870 thunk = PTR_SEG_TO_LIN( thunkaddr );
872 dprintf_task( stddeb, "MakeProcInstance(%08lx,%04x): got thunk %08lx\n",
873 (SEGPTR)func, hInstance, (SEGPTR)thunkaddr );
875 *thunk++ = 0xb8; /* movw instance, %ax */
876 *thunk++ = (BYTE)(hInstance & 0xff);
877 *thunk++ = (BYTE)(hInstance >> 8);
878 *thunk++ = 0xea; /* ljmp func */
879 *(DWORD *)thunk = (DWORD)func;
880 return (FARPROC)thunkaddr;
884 /***********************************************************************
885 * FreeProcInstance (KERNEL.52)
887 void FreeProcInstance( FARPROC func )
889 dprintf_task( stddeb, "FreeProcInstance(%08lx)\n", (SEGPTR)func );
890 TASK_FreeThunk( hCurrentTask, (SEGPTR)func );
894 /**********************************************************************
895 * GetCodeHandle (KERNEL.93)
897 HANDLE GetCodeHandle( FARPROC proc )
900 BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
902 /* Return the code segment containing 'proc'. */
903 /* Not sure if this is really correct (shouldn't matter that much). */
905 /* Check if it is really a thunk */
906 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
907 handle = GlobalHandle( thunk[6] + (thunk[7] << 8) );
909 handle = GlobalHandle( HIWORD(proc) );
911 printf( "STUB: GetCodeHandle(%08lx) returning %04x\n",
912 (DWORD)proc, handle );
917 /***********************************************************************
918 * SetTaskQueue (KERNEL.34)
920 HGLOBAL SetTaskQueue( HANDLE hTask, HGLOBAL hQueue )
925 if (!hTask) hTask = hCurrentTask;
926 if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0;
927 hPrev = pTask->hQueue;
928 pTask->hQueue = hQueue;
933 /***********************************************************************
934 * GetTaskQueue (KERNEL.35)
936 HGLOBAL GetTaskQueue( HANDLE hTask )
940 if (!hTask) hTask = hCurrentTask;
941 if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0;
942 return pTask->hQueue;
946 /***********************************************************************
947 * GetCurrentTask (KERNEL.36)
949 HTASK GetCurrentTask(void)
951 /* Undocumented: first task is returned in high word */
952 return MAKELONG( hCurrentTask, hFirstTask );
956 /***********************************************************************
957 * GetCurrentPDB (KERNEL.37)
959 WORD GetCurrentPDB(void)
963 if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0;
968 /***********************************************************************
969 * GetInstanceData (KERNEL.54)
971 int GetInstanceData( HANDLE instance, WORD buffer, int len )
973 char *ptr = (char *)GlobalLock( instance );
974 if (!ptr || !len) return 0;
975 if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
976 memcpy( ptr + buffer, (char *)GlobalLock( CURRENT_DS ) + buffer, len );
981 /***********************************************************************
982 * GetDOSEnvironment (KERNEL.131)
984 SEGPTR GetDOSEnvironment(void)
988 if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0;
989 return WIN16_GlobalLock( pTask->pdb.environment );
993 /***********************************************************************
994 * GetNumTasks (KERNEL.152)
996 WORD GetNumTasks(void)
1002 /***********************************************************************
1003 * GetTaskDS (KERNEL.155)
1005 WORD GetTaskDS(void)
1009 if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0;
1010 return pTask->hInstance;
1014 /***********************************************************************
1015 * IsTask (KERNEL.320)
1017 BOOL IsTask( HTASK hTask )
1021 if (!(pTask = (TDB *)GlobalLock( hTask ))) return FALSE;
1022 if (GlobalSize( hTask ) < sizeof(TDB)) return FALSE;
1023 return (pTask->magic == TDB_MAGIC);
1027 /***********************************************************************
1028 * GetExePtr (KERNEL.133)
1030 HMODULE GetExePtr( HANDLE handle )
1036 /* Check for module handle */
1038 if (!(ptr = GlobalLock( handle ))) return 0;
1039 if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return handle;
1041 /* Check the owner for module handle */
1043 owner = FarGetOwner( handle );
1044 if (!(ptr = GlobalLock( owner ))) return 0;
1045 if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return owner;
1047 /* Search for this handle and its owner inside all tasks */
1052 TDB *pTask = (TDB *)GlobalLock( hTask );
1053 if ((hTask == handle) ||
1054 (pTask->hInstance == handle) ||
1055 (pTask->hQueue == handle) ||
1056 (pTask->hPDB == handle)) return pTask->hModule;
1057 if ((hTask == owner) ||
1058 (pTask->hInstance == owner) ||
1059 (pTask->hQueue == owner) ||
1060 (pTask->hPDB == owner)) return pTask->hModule;
1061 hTask = pTask->hNext;
1067 /***********************************************************************
1068 * TaskFirst (TOOLHELP.63)
1070 BOOL TaskFirst( TASKENTRY *lpte )
1072 lpte->hNext = hFirstTask;
1073 return TaskNext( lpte );
1077 /***********************************************************************
1078 * TaskNext (TOOLHELP.64)
1080 BOOL TaskNext( TASKENTRY *lpte )
1083 INSTANCEDATA *pInstData;
1085 dprintf_toolhelp( stddeb, "TaskNext(%p): task=%04x\n", lpte, lpte->hNext );
1086 if (!lpte->hNext) return FALSE;
1087 pTask = (TDB *)GlobalLock( lpte->hNext );
1088 if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1089 pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
1090 lpte->hTask = lpte->hNext;
1091 lpte->hTaskParent = pTask->hParent;
1092 lpte->hInst = pTask->hInstance;
1093 lpte->hModule = pTask->hModule;
1094 lpte->wSS = pTask->ss;
1095 lpte->wSP = pTask->sp;
1096 lpte->wStackTop = pInstData->stacktop;
1097 lpte->wStackMinimum = pInstData->stackmin;
1098 lpte->wStackBottom = pInstData->stackbottom;
1099 lpte->wcEvents = pTask->nEvents;
1100 lpte->hQueue = pTask->hQueue;
1101 strncpy( lpte->szModule, pTask->module_name, 8 );
1102 lpte->szModule[8] = '\0';
1103 lpte->wPSPOffset = 0x100; /*??*/
1104 lpte->hNext = pTask->hNext;
1109 /***********************************************************************
1110 * TaskFindHandle (TOOLHELP.65)
1112 BOOL TaskFindHandle( TASKENTRY *lpte, HTASK hTask )
1114 lpte->hNext = hTask;
1115 return TaskNext( lpte );