Improved display and layout code.
[wine.git] / loader / task.c
blob1bdca4366855e24d1ef8c4561654259164058348
1 /*
2 * Task functions
4 * Copyright 1995 Alexandre Julliard
5 */
7 #include <stdlib.h>
8 #include <string.h>
9 #include <assert.h>
11 #include "windows.h"
12 #include "user.h"
13 #include "callback.h"
14 #include "drive.h"
15 #include "file.h"
16 #include "global.h"
17 #include "instance.h"
18 #include "message.h"
19 #include "miscemu.h"
20 #include "module.h"
21 #include "neexe.h"
22 #include "peexe.h"
23 #include "pe_image.h"
24 #include "process.h"
25 #include "queue.h"
26 #include "selectors.h"
27 #include "stackframe.h"
28 #include "task.h"
29 #include "thread.h"
30 #include "toolhelp.h"
31 #include "winnt.h"
32 #include "winsock.h"
33 #include "thread.h"
34 #include "syslevel.h"
35 #include "debug.h"
36 #include "dosexe.h"
37 #include "dde_proc.h"
38 #include "server.h"
40 /* Min. number of thunks allocated when creating a new segment */
41 #define MIN_THUNKS 32
43 /* Pointer to function to switch to a larger stack */
44 int (*IF1632_CallLargeStack)( int (*func)(), void *arg ) = NULL;
47 static THHOOK DefaultThhook = { 0 };
48 THHOOK *pThhook = &DefaultThhook;
50 #define hCurrentTask (pThhook->CurTDB)
51 #define hFirstTask (pThhook->HeadTDB)
52 #define hLockedTask (pThhook->LockTDB)
54 static HTASK16 hTaskToKill = 0;
55 static UINT16 nTaskCount = 0;
57 static void TASK_YieldToSystem(TDB*);
59 extern BOOL32 THREAD_InitDone;
62 /***********************************************************************
63 * TASK_InstallTHHook
65 void TASK_InstallTHHook( THHOOK *pNewThhook )
67 THHOOK *pOldThhook = pThhook;
69 pThhook = pNewThhook? pNewThhook : &DefaultThhook;
71 *pThhook = *pOldThhook;
74 /***********************************************************************
75 * TASK_GetNextTask
77 HTASK16 TASK_GetNextTask( HTASK16 hTask )
79 TDB* pTask = (TDB*)GlobalLock16(hTask);
81 if (pTask->hNext) return pTask->hNext;
82 return (hFirstTask != hTask) ? hFirstTask : 0;
85 /***********************************************************************
86 * TASK_LinkTask
88 static void TASK_LinkTask( HTASK16 hTask )
90 HTASK16 *prevTask;
91 TDB *pTask;
93 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
94 prevTask = &hFirstTask;
95 while (*prevTask)
97 TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask );
98 if (prevTaskPtr->priority >= pTask->priority) break;
99 prevTask = &prevTaskPtr->hNext;
101 pTask->hNext = *prevTask;
102 *prevTask = hTask;
103 nTaskCount++;
107 /***********************************************************************
108 * TASK_UnlinkTask
110 static void TASK_UnlinkTask( HTASK16 hTask )
112 HTASK16 *prevTask;
113 TDB *pTask;
115 prevTask = &hFirstTask;
116 while (*prevTask && (*prevTask != hTask))
118 pTask = (TDB *)GlobalLock16( *prevTask );
119 prevTask = &pTask->hNext;
121 if (*prevTask)
123 pTask = (TDB *)GlobalLock16( *prevTask );
124 *prevTask = pTask->hNext;
125 pTask->hNext = 0;
126 nTaskCount--;
131 /***********************************************************************
132 * TASK_CreateThunks
134 * Create a thunk free-list in segment 'handle', starting from offset 'offset'
135 * and containing 'count' entries.
137 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
139 int i;
140 WORD free;
141 THUNKS *pThunk;
143 pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
144 pThunk->next = 0;
145 pThunk->magic = THUNK_MAGIC;
146 pThunk->free = (int)&pThunk->thunks - (int)pThunk;
147 free = pThunk->free;
148 for (i = 0; i < count-1; i++)
150 free += 8; /* Offset of next thunk */
151 pThunk->thunks[4*i] = free;
153 pThunk->thunks[4*i] = 0; /* Last thunk */
157 /***********************************************************************
158 * TASK_AllocThunk
160 * Allocate a thunk for MakeProcInstance().
162 static SEGPTR TASK_AllocThunk( HTASK16 hTask )
164 TDB *pTask;
165 THUNKS *pThunk;
166 WORD sel, base;
168 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
169 sel = pTask->hCSAlias;
170 pThunk = &pTask->thunks;
171 base = (int)pThunk - (int)pTask;
172 while (!pThunk->free)
174 sel = pThunk->next;
175 if (!sel) /* Allocate a new segment */
177 sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
178 pTask->hPDB, TRUE, FALSE, FALSE );
179 if (!sel) return (SEGPTR)0;
180 TASK_CreateThunks( sel, 0, MIN_THUNKS );
181 pThunk->next = sel;
183 pThunk = (THUNKS *)GlobalLock16( sel );
184 base = 0;
186 base += pThunk->free;
187 pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
188 return PTR_SEG_OFF_TO_SEGPTR( sel, base );
192 /***********************************************************************
193 * TASK_FreeThunk
195 * Free a MakeProcInstance() thunk.
197 static BOOL32 TASK_FreeThunk( HTASK16 hTask, SEGPTR thunk )
199 TDB *pTask;
200 THUNKS *pThunk;
201 WORD sel, base;
203 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
204 sel = pTask->hCSAlias;
205 pThunk = &pTask->thunks;
206 base = (int)pThunk - (int)pTask;
207 while (sel && (sel != HIWORD(thunk)))
209 sel = pThunk->next;
210 pThunk = (THUNKS *)GlobalLock16( sel );
211 base = 0;
213 if (!sel) return FALSE;
214 *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
215 pThunk->free = LOWORD(thunk) - base;
216 return TRUE;
220 /***********************************************************************
221 * TASK_CallToStart
223 * 32-bit entry point for a new task. This function is responsible for
224 * setting up the registers and jumping to the 16-bit entry point.
226 static void TASK_CallToStart(void)
228 TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
229 NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
230 SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
232 SET_CUR_THREAD( pTask->thdb );
233 CLIENT_InitThread();
235 /* Terminate the stack frame chain */
236 memset(THREAD_STACK16( pTask->thdb ), '\0', sizeof(STACK16FRAME));
238 if (pModule->flags & NE_FFLAGS_WIN32)
240 /* FIXME: all this is an ugly hack */
242 LPTHREAD_START_ROUTINE entry = (LPTHREAD_START_ROUTINE)
243 RVA_PTR(pModule->module32, OptionalHeader.AddressOfEntryPoint);
244 DWORD size = PE_HEADER(pModule->module32)->OptionalHeader.SizeOfStackReserve;
245 DWORD id;
246 THDB *thdb;
248 pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
249 if (pModule->heap_size)
250 LocalInit( pTask->hInstance, 0, pModule->heap_size );
252 InitApp( pTask->hModule );
253 MODULE_InitializeDLLs( PROCESS_Current(), 0, DLL_PROCESS_ATTACH, (LPVOID)-1 );
254 TRACE(relay, "(entryproc=%p)\n", entry );
256 #if 1
257 ExitProcess( entry(NULL) );
258 #else
259 CreateThread( NULL, size, entry, NULL, 0, &id );
260 thdb = THREAD_ID_TO_THDB( id );
262 while ( thdb->exit_code == 0x103 )
264 WaitEvent( 0 );
265 QUEUE_Signal( pTask->hSelf );
268 ExitProcess( thdb->exit_code );
269 #endif
271 else if (pModule->dos_image)
273 DOSVM_Enter( NULL );
274 ExitProcess( 0 );
276 else
278 /* Registers at initialization must be:
279 * ax zero
280 * bx stack size in bytes
281 * cx heap size in bytes
282 * si previous app instance
283 * di current app instance
284 * bp zero
285 * es selector to the PSP
286 * ds dgroup of the application
287 * ss stack selector
288 * sp top of the stack
290 CONTEXT context;
292 memset( &context, 0, sizeof(context) );
293 CS_reg(&context) = GlobalHandleToSel(pSegTable[pModule->cs - 1].hSeg);
294 DS_reg(&context) = GlobalHandleToSel(pSegTable[pModule->dgroup - 1].hSeg);
295 ES_reg(&context) = pTask->hPDB;
296 EIP_reg(&context) = pModule->ip;
297 EBX_reg(&context) = pModule->stack_size;
298 ECX_reg(&context) = pModule->heap_size;
299 EDI_reg(&context) = context.SegDs;
301 TRACE(task, "Starting main program: cs:ip=%04lx:%04x ds=%04lx ss:sp=%04x:%04x\n",
302 CS_reg(&context), IP_reg(&context), DS_reg(&context),
303 SELECTOROF(pTask->thdb->cur_stack),
304 OFFSETOF(pTask->thdb->cur_stack) );
306 Callbacks->CallRegisterShortProc( &context, 0 );
307 /* This should never return */
308 ERR( task, "Main program returned! (should never happen)\n" );
309 ExitProcess( 1 );
314 /***********************************************************************
315 * TASK_Create
317 * NOTE: This routine might be called by a Win32 thread. We don't have
318 * any real problems with that, since we operated merely on a private
319 * TDB structure that is not yet linked into the task list.
321 HTASK16 TASK_Create( THDB *thdb, NE_MODULE *pModule, HINSTANCE16 hInstance,
322 HINSTANCE16 hPrevInstance, UINT16 cmdShow)
324 HTASK16 hTask;
325 TDB *pTask;
326 LPSTR cmd_line;
327 WORD sp;
328 char *stack32Top;
329 char name[10];
330 STACK16FRAME *frame16;
331 STACK32FRAME *frame32;
332 PDB32 *pdb32 = thdb->process;
333 SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
335 /* Allocate the task structure */
337 hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
338 pModule->self, FALSE, FALSE, FALSE );
339 if (!hTask) return 0;
340 pTask = (TDB *)GlobalLock16( hTask );
342 /* Fill the task structure */
344 pTask->nEvents = 1; /* So the task can be started */
345 pTask->hSelf = hTask;
346 pTask->flags = 0;
348 if (pModule->flags & NE_FFLAGS_WIN32)
349 pTask->flags |= TDBF_WIN32;
350 if (pModule->lpDosTask)
351 pTask->flags |= TDBF_WINOLDAP;
353 pTask->version = pModule->expected_version;
354 pTask->hInstance = hInstance;
355 pTask->hPrevInstance = hPrevInstance;
356 pTask->hModule = pModule->self;
357 pTask->hParent = GetCurrentTask();
358 pTask->magic = TDB_MAGIC;
359 pTask->nCmdShow = cmdShow;
360 pTask->thdb = thdb;
361 pTask->curdrive = DRIVE_GetCurrentDrive() | 0x80;
362 strcpy( pTask->curdir, "\\" );
363 lstrcpyn32A( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
364 sizeof(pTask->curdir) - 1 );
366 /* Create the thunks block */
368 TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
370 /* Copy the module name */
372 GetModuleName( pModule->self, name, sizeof(name) );
373 strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
375 /* Allocate a selector for the PDB */
377 pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
378 pModule->self, FALSE, FALSE, FALSE, NULL );
380 /* Fill the PDB */
382 pTask->pdb.int20 = 0x20cd;
383 pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
384 PUT_DWORD(&pTask->pdb.dispatcher[1], (DWORD)NE_GetEntryPoint(
385 GetModuleHandle16("KERNEL"), 102 )); /* KERNEL.102 is DOS3Call() */
386 pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
387 pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
388 pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
389 pTask->pdb.fileHandlesPtr =
390 PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel(pTask->hPDB),
391 (int)&((PDB *)0)->fileHandles );
392 pTask->pdb.hFileHandles = 0;
393 memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
394 pTask->pdb.environment = pdb32->env_db->env_sel;
395 pTask->pdb.nbFiles = 20;
397 /* Fill the command line */
399 cmd_line = pdb32->env_db->cmd_line;
400 while (*cmd_line && (*cmd_line != ' ') && (*cmd_line != '\t')) cmd_line++;
401 while ((*cmd_line == ' ') || (*cmd_line == '\t')) cmd_line++;
402 lstrcpyn32A( pTask->pdb.cmdLine+1, cmd_line, sizeof(pTask->pdb.cmdLine)-1);
403 pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 );
405 /* Get the compatibility flags */
407 pTask->compat_flags = GetProfileInt32A( "Compatibility", name, 0 );
409 /* Allocate a code segment alias for the TDB */
411 pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
412 sizeof(TDB), pTask->hPDB, TRUE,
413 FALSE, FALSE, NULL );
415 /* Set the owner of the environment block */
417 FarSetOwner( pTask->pdb.environment, pTask->hPDB );
419 /* Default DTA overwrites command-line */
421 pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
422 (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
424 /* Create the 16-bit stack frame */
426 if (!(sp = pModule->sp))
427 sp = pSegTable[pModule->ss-1].minsize + pModule->stack_size;
428 sp &= ~1; sp -= 2*sizeof(STACK16FRAME);
429 pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( pTask->hInstance, sp );
430 frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
431 frame16->ebp = sp + (int)&((STACK16FRAME *)0)->bp;
432 frame16->bp = LOWORD(frame16->ebp);
433 frame16->ds = frame16->es = pTask->hInstance;
434 frame16->fs = 0;
435 frame16->entry_point = 0;
436 frame16->entry_cs = 0;
437 frame16->mutex_count = 1; /* TASK_Reschedule is called from 16-bit code */
438 /* The remaining fields will be initialized in TASK_Reschedule */
440 /* Create the 32-bit stack frame */
442 stack32Top = (char*)pTask->thdb->teb.stack_top;
443 frame16->frame32 = frame32 = (STACK32FRAME *)stack32Top - 1;
444 frame32->frame16 = pTask->thdb->cur_stack + sizeof(STACK16FRAME);
445 frame32->edi = 0;
446 frame32->esi = 0;
447 frame32->edx = 0;
448 frame32->ecx = 0;
449 frame32->ebx = 0;
450 frame32->retaddr = (DWORD)TASK_CallToStart;
451 /* The remaining fields will be initialized in TASK_Reschedule */
454 TRACE(task, "module='%s' cmdline='%s' task=%04x\n",
455 name, cmd_line, hTask );
457 return hTask;
460 /***********************************************************************
461 * TASK_StartTask
463 * NOTE: This routine might be called by a Win32 thread. Thus, we need
464 * to be careful to protect global data structures. We do this
465 * by entering the Win16Lock while linking the task into the
466 * global task list.
468 void TASK_StartTask( HTASK16 hTask )
470 /* Add the task to the linked list */
472 SYSLEVEL_EnterWin16Lock();
473 TASK_LinkTask( hTask );
474 SYSLEVEL_LeaveWin16Lock();
476 TRACE(task, "linked task %04x\n", hTask );
478 /* Get the task up and running. If we ourselves are a 16-bit task,
479 we simply Yield(). If we are 32-bit however, we need to signal
480 the main process somehow (NOT YET IMPLEMENTED!) */
482 if ( THREAD_IsWin16( THREAD_Current() ) )
483 OldYield();
484 else
485 FIXME(task, "Don't know how to start 16-bit task from 32-bit thread. Move the mouse!\n");
489 /***********************************************************************
490 * TASK_DeleteTask
492 static void TASK_DeleteTask( HTASK16 hTask )
494 TDB *pTask;
495 HGLOBAL16 hPDB;
497 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
498 hPDB = pTask->hPDB;
500 pTask->magic = 0xdead; /* invalidate signature */
502 /* Delete the Win32 part of the task */
504 K32OBJ_DecCount( &pTask->thdb->process->header );
505 K32OBJ_DecCount( &pTask->thdb->header );
507 /* Free the task module */
509 FreeModule16( pTask->hModule );
511 /* Free the selector aliases */
513 GLOBAL_FreeBlock( pTask->hCSAlias );
514 GLOBAL_FreeBlock( pTask->hPDB );
516 /* Free the task structure itself */
518 GlobalFree16( hTask );
520 /* Free all memory used by this task (including the 32-bit stack, */
521 /* the environment block and the thunk segments). */
523 GlobalFreeAll( hPDB );
527 /***********************************************************************
528 * TASK_KillCurrentTask
530 * Kill the currently running task. As it's not possible to kill the
531 * current task like this, it is simply marked for destruction, and will
532 * be killed when either TASK_Reschedule or this function is called again
533 * in the context of another task.
535 void TASK_KillCurrentTask( INT16 exitCode )
537 TDB* pTask = (TDB*) GlobalLock16( GetCurrentTask() );
538 NE_MODULE* pModule = NE_GetPtr( pTask->hModule );
539 if (!pTask) USER_ExitWindows(); /* No current task yet */
541 if ( !THREAD_IsWin16( THREAD_Current() ) )
543 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
544 return;
547 /* Enter the Win16Lock to protect global data structures
548 NOTE: We never explicitly leave it again. This shouldn't matter
549 though, as it will be released in TASK_Reschedule and this
550 task won't ever get scheduled again ... */
552 SYSLEVEL_EnterWin16Lock();
554 assert(hCurrentTask == GetCurrentTask());
556 TRACE(task, "Killing task %04x\n", hCurrentTask );
558 /* Delete active sockets */
560 if( pTask->pwsi )
561 WINSOCK_DeleteTaskWSI( pTask, pTask->pwsi );
563 #ifdef MZ_SUPPORTED
564 /* Kill DOS VM task */
565 if ( pModule->lpDosTask )
566 MZ_KillModule( pModule->lpDosTask );
567 #endif
569 /* Perform USER cleanup */
571 if (pTask->userhandler)
572 pTask->userhandler( hCurrentTask, USIG_TERMINATION, 0,
573 pTask->hInstance, pTask->hQueue );
575 if (hTaskToKill && (hTaskToKill != hCurrentTask))
577 /* If another task is already marked for destruction, */
578 /* we can kill it now, as we are in another context. */
579 TASK_DeleteTask( hTaskToKill );
582 if (nTaskCount <= 2) /* FIXME */
584 TRACE(task, "this is the last task, exiting\n" );
585 USER_ExitWindows();
588 /* Remove the task from the list to be sure we never switch back to it */
589 TASK_UnlinkTask( hCurrentTask );
590 if( nTaskCount )
592 TDB* p = (TDB *)GlobalLock16( hFirstTask );
593 while( p )
595 if( p->hYieldTo == hCurrentTask ) p->hYieldTo = 0;
596 p = (TDB *)GlobalLock16( p->hNext );
600 hTaskToKill = hCurrentTask;
601 hLockedTask = 0;
603 pTask->nEvents = 0;
604 TASK_YieldToSystem(pTask);
606 /* We should never return from this Yield() */
608 ERR(task,"Return of the living dead %04x!!!\n", hCurrentTask);
609 exit(1);
612 /***********************************************************************
613 * TASK_Reschedule
615 * This is where all the magic of task-switching happens!
617 * Note: This function should only be called via the TASK_YieldToSystem()
618 * wrapper, to make sure that all the context is saved correctly.
620 * It must not call functions that may yield control.
622 void TASK_Reschedule(void)
624 TDB *pOldTask = NULL, *pNewTask;
625 HTASK16 hTask = 0;
626 STACK16FRAME *newframe16;
628 /* Get the initial task up and running */
629 if (!hCurrentTask && GetCurrentTask())
631 /* We need to remove one pair of stackframes (exept for Winelib) */
632 STACK16FRAME *oldframe16 = CURRENT_STACK16;
633 STACK32FRAME *oldframe32 = oldframe16->frame32;
634 STACK16FRAME *newframe16 = PTR_SEG_TO_LIN( oldframe32->frame16 );
635 STACK32FRAME *newframe32 = newframe16->frame32;
636 if (newframe32)
638 newframe16->entry_ip = oldframe16->entry_ip;
639 newframe16->entry_cs = oldframe16->entry_cs;
640 newframe16->ip = oldframe16->ip;
641 newframe16->cs = oldframe16->cs;
642 newframe32->ebp = oldframe32->ebp;
643 newframe32->restore_addr = oldframe32->restore_addr;
644 newframe32->codeselector = oldframe32->codeselector;
645 newframe32->retaddr = oldframe32->retaddr; /* don't call TASK_CallToStart */
647 THREAD_Current()->cur_stack = oldframe32->frame16;
650 hCurrentTask = GetCurrentTask();
651 pNewTask = (TDB *)GlobalLock16( hCurrentTask );
652 pNewTask->ss_sp = pNewTask->thdb->cur_stack;
653 return;
656 /* NOTE: As we are entered from 16-bit code, we hold the Win16Lock.
657 We hang onto it thoughout most of this routine, so that accesses
658 to global variables (most notably the task list) are protected. */
659 assert(hCurrentTask == GetCurrentTask());
661 TRACE(task, "entered with hTask %04x (pid %d)\n", hCurrentTask, getpid());
663 #ifdef CONFIG_IPC
664 /* FIXME: What about the Win16Lock ??? */
665 dde_reschedule();
666 #endif
667 /* First check if there's a task to kill */
669 if (hTaskToKill && (hTaskToKill != hCurrentTask))
671 TASK_DeleteTask( hTaskToKill );
672 hTaskToKill = 0;
675 /* Find a task to yield to */
677 pOldTask = (TDB *)GlobalLock16( hCurrentTask );
678 if (pOldTask && pOldTask->hYieldTo)
680 /* check for DirectedYield() */
682 hTask = pOldTask->hYieldTo;
683 pNewTask = (TDB *)GlobalLock16( hTask );
684 if( !pNewTask || !pNewTask->nEvents) hTask = 0;
685 pOldTask->hYieldTo = 0;
688 /* extract hardware events only! */
690 if (!hTask) EVENT_WaitNetEvent( FALSE, TRUE );
692 while (!hTask)
694 /* Find a task that has an event pending */
696 hTask = hFirstTask;
697 while (hTask)
699 pNewTask = (TDB *)GlobalLock16( hTask );
701 TRACE(task, "\ttask = %04x, events = %i\n", hTask, pNewTask->nEvents);
703 if (pNewTask->nEvents) break;
704 hTask = pNewTask->hNext;
706 if (hLockedTask && (hTask != hLockedTask)) hTask = 0;
707 if (hTask) break;
709 /* No task found, wait for some events to come in */
711 /* NOTE: We release the Win16Lock while waiting for events. This is to enable
712 Win32 threads to thunk down to 16-bit temporarily. Since Win16
713 tasks won't execute and Win32 threads are not allowed to enter
714 TASK_Reschedule anyway, there should be no re-entrancy problem ... */
716 SYSLEVEL_ReleaseWin16Lock();
717 EVENT_WaitNetEvent( TRUE, TRUE );
718 SYSLEVEL_RestoreWin16Lock();
721 if (hTask == hCurrentTask)
723 TRACE(task, "returning to the current task(%04x)\n", hTask );
724 return; /* Nothing to do */
726 pNewTask = (TDB *)GlobalLock16( hTask );
727 TRACE(task, "Switching to task %04x (%.8s)\n",
728 hTask, pNewTask->module_name );
730 /* Make the task the last in the linked list (round-robin scheduling) */
732 pNewTask->priority++;
733 TASK_UnlinkTask( hTask );
734 TASK_LinkTask( hTask );
735 pNewTask->priority--;
737 /* Finish initializing the new task stack if necessary */
739 newframe16 = THREAD_STACK16( pNewTask->thdb );
740 if (!newframe16->entry_cs)
742 STACK16FRAME *oldframe16 = CURRENT_STACK16;
743 STACK32FRAME *oldframe32 = oldframe16->frame32;
744 STACK32FRAME *newframe32 = newframe16->frame32;
745 newframe16->entry_ip = oldframe16->entry_ip;
746 newframe16->entry_cs = oldframe16->entry_cs;
747 newframe16->ip = oldframe16->ip;
748 newframe16->cs = oldframe16->cs;
749 newframe32->ebp = oldframe32->ebp;
750 newframe32->restore_addr = oldframe32->restore_addr;
751 newframe32->codeselector = oldframe32->codeselector;
754 /* Switch to the new stack */
756 /* NOTE: We need to release/restore the Win16Lock, as the task
757 switched to might be at another recursion level than
758 the old task ... */
760 SYSLEVEL_ReleaseWin16Lock();
762 hCurrentTask = hTask;
763 SET_CUR_THREAD( pNewTask->thdb );
764 pNewTask->ss_sp = pNewTask->thdb->cur_stack;
766 SYSLEVEL_RestoreWin16Lock();
770 /***********************************************************************
771 * TASK_YieldToSystem
773 * Scheduler interface, this way we ensure that all "unsafe" events are
774 * processed outside the scheduler.
776 void TASK_YieldToSystem(TDB* pTask)
778 MESSAGEQUEUE* pQ;
780 if ( !THREAD_IsWin16( THREAD_Current() ) )
782 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
783 return;
786 Callbacks->CallTaskRescheduleProc();
788 if( pTask )
790 pQ = (MESSAGEQUEUE*)GlobalLock16(pTask->hQueue);
791 if( pQ && pQ->flags & QUEUE_FLAG_XEVENT &&
792 !(pQ->wakeBits & (QS_SENDMESSAGE | QS_SMRESULT)) )
794 pQ->flags &= ~QUEUE_FLAG_XEVENT;
795 EVENT_WaitNetEvent( FALSE, FALSE );
801 /***********************************************************************
802 * InitTask (KERNEL.91)
804 * Called by the application startup code.
806 void WINAPI InitTask( CONTEXT *context )
808 TDB *pTask;
809 NE_MODULE *pModule;
810 SEGTABLEENTRY *pSegTable;
811 INSTANCEDATA *pinstance;
812 LONG stacklow, stackhi;
814 if (context) EAX_reg(context) = 0;
815 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
816 if (!(pModule = NE_GetPtr( pTask->hModule ))) return;
818 /* This is a hack to install task USER signal handler before
819 * implicitly loaded DLLs are initialized (see windows/user.c) */
821 pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
823 /* Initialize implicitly loaded DLLs */
824 NE_InitializeDLLs( pTask->hModule );
826 if (context)
828 /* Registers on return are:
829 * ax 1 if OK, 0 on error
830 * cx stack limit in bytes
831 * dx cmdShow parameter
832 * si instance handle of the previous instance
833 * di instance handle of the new task
834 * es:bx pointer to command-line inside PSP
836 * 0 (=%bp) is pushed on the stack
838 SEGPTR ptr = STACK16_PUSH( pTask->thdb, sizeof(WORD) );
839 *(WORD *)PTR_SEG_TO_LIN(ptr) = 0;
840 SP_reg(context) -= 2;
842 EAX_reg(context) = 1;
844 if (!pTask->pdb.cmdLine[0]) EBX_reg(context) = 0x80;
845 else
847 LPBYTE p = &pTask->pdb.cmdLine[1];
848 while ((*p == ' ') || (*p == '\t')) p++;
849 EBX_reg(context) = 0x80 + (p - pTask->pdb.cmdLine);
851 ECX_reg(context) = pModule->stack_size;
852 EDX_reg(context) = pTask->nCmdShow;
853 ESI_reg(context) = (DWORD)pTask->hPrevInstance;
854 EDI_reg(context) = (DWORD)pTask->hInstance;
855 ES_reg (context) = (WORD)pTask->hPDB;
858 /* Initialize the local heap */
859 if ( pModule->heap_size )
861 LocalInit( pTask->hInstance, 0, pModule->heap_size );
864 /* Initialize the INSTANCEDATA structure */
865 pSegTable = NE_SEG_TABLE( pModule );
866 stacklow = pSegTable[pModule->ss - 1].minsize;
867 stackhi = stacklow + pModule->stack_size;
868 if (stackhi > 0xffff) stackhi = 0xffff;
869 pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
870 pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
871 pinstance->stacktop = stacklow;
872 pinstance->stackmin = OFFSETOF( pTask->thdb->cur_stack );
876 /***********************************************************************
877 * WaitEvent (KERNEL.30)
879 BOOL16 WINAPI WaitEvent( HTASK16 hTask )
881 TDB *pTask;
883 if (!hTask) hTask = GetCurrentTask();
884 pTask = (TDB *)GlobalLock16( hTask );
886 if ( !THREAD_IsWin16( THREAD_Current() ) )
888 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
889 return TRUE;
892 if (pTask->nEvents > 0)
894 pTask->nEvents--;
895 return FALSE;
897 TASK_YieldToSystem(pTask);
899 /* When we get back here, we have an event */
901 if (pTask->nEvents > 0) pTask->nEvents--;
902 return TRUE;
906 /***********************************************************************
907 * PostEvent (KERNEL.31)
909 void WINAPI PostEvent( HTASK16 hTask )
911 TDB *pTask;
913 if (!hTask) hTask = GetCurrentTask();
914 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
916 if ( !THREAD_IsWin16( THREAD_Current() ) )
918 WARN(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
919 /* return; */
922 pTask->nEvents++;
926 /***********************************************************************
927 * SetPriority (KERNEL.32)
929 void WINAPI SetPriority( HTASK16 hTask, INT16 delta )
931 TDB *pTask;
932 INT16 newpriority;
934 if (!hTask) hTask = GetCurrentTask();
935 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
936 newpriority = pTask->priority + delta;
937 if (newpriority < -32) newpriority = -32;
938 else if (newpriority > 15) newpriority = 15;
940 pTask->priority = newpriority + 1;
941 TASK_UnlinkTask( hTask );
942 TASK_LinkTask( hTask );
943 pTask->priority--;
947 /***********************************************************************
948 * LockCurrentTask (KERNEL.33)
950 HTASK16 WINAPI LockCurrentTask( BOOL16 bLock )
952 if (bLock) hLockedTask = GetCurrentTask();
953 else hLockedTask = 0;
954 return hLockedTask;
958 /***********************************************************************
959 * IsTaskLocked (KERNEL.122)
961 HTASK16 WINAPI IsTaskLocked(void)
963 return hLockedTask;
967 /***********************************************************************
968 * OldYield (KERNEL.117)
970 void WINAPI OldYield(void)
972 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
974 if ( !THREAD_IsWin16( THREAD_Current() ) )
976 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
977 return;
980 if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */
981 TASK_YieldToSystem(pCurTask);
982 if (pCurTask) pCurTask->nEvents--;
986 /***********************************************************************
987 * DirectedYield (KERNEL.150)
989 void WINAPI DirectedYield( HTASK16 hTask )
991 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
993 if ( !THREAD_IsWin16( THREAD_Current() ) )
995 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
996 return;
999 TRACE(task, "%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
1001 pCurTask->hYieldTo = hTask;
1002 OldYield();
1004 TRACE(task, "%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
1008 /***********************************************************************
1009 * UserYield (USER.332)
1011 void WINAPI UserYield(void)
1013 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1014 MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
1016 if ( !THREAD_IsWin16( THREAD_Current() ) )
1018 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1019 return;
1022 /* Handle sent messages */
1023 while (queue && (queue->wakeBits & QS_SENDMESSAGE))
1024 QUEUE_ReceiveMessage( queue );
1026 OldYield();
1028 queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
1029 while (queue && (queue->wakeBits & QS_SENDMESSAGE))
1030 QUEUE_ReceiveMessage( queue );
1034 /***********************************************************************
1035 * Yield16 (KERNEL.29)
1037 void WINAPI Yield16(void)
1039 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1041 if ( !THREAD_IsWin16( THREAD_Current() ) )
1043 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1044 return;
1047 if (pCurTask) pCurTask->hYieldTo = 0;
1048 if (pCurTask && pCurTask->hQueue) UserYield();
1049 else OldYield();
1053 /***********************************************************************
1054 * MakeProcInstance16 (KERNEL.51)
1056 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
1058 BYTE *thunk,*lfunc;
1059 SEGPTR thunkaddr;
1061 if (!func) {
1062 ERR(task, "Ouch ! MakeProcInstance called with func == NULL !\n");
1063 return (FARPROC16)0; /* Windows seems to do the same */
1065 if (!hInstance) hInstance = CURRENT_DS;
1066 thunkaddr = TASK_AllocThunk( GetCurrentTask() );
1067 if (!thunkaddr) return (FARPROC16)0;
1068 thunk = PTR_SEG_TO_LIN( thunkaddr );
1069 lfunc = PTR_SEG_TO_LIN( func );
1071 TRACE(task, "(%08lx,%04x): got thunk %08lx\n",
1072 (DWORD)func, hInstance, (DWORD)thunkaddr );
1073 if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) ||
1074 ((lfunc[0]==0x1e) && (lfunc[1]==0x58))
1076 FIXME(task,"thunk would be useless for %p, overwriting with nop;nop;\n", func );
1077 lfunc[0]=0x90; /* nop */
1078 lfunc[1]=0x90; /* nop */
1081 *thunk++ = 0xb8; /* movw instance, %ax */
1082 *thunk++ = (BYTE)(hInstance & 0xff);
1083 *thunk++ = (BYTE)(hInstance >> 8);
1084 *thunk++ = 0xea; /* ljmp func */
1085 *(DWORD *)thunk = (DWORD)func;
1086 return (FARPROC16)thunkaddr;
1090 /***********************************************************************
1091 * FreeProcInstance16 (KERNEL.52)
1093 void WINAPI FreeProcInstance16( FARPROC16 func )
1095 TRACE(task, "(%08lx)\n", (DWORD)func );
1096 TASK_FreeThunk( GetCurrentTask(), (SEGPTR)func );
1100 /**********************************************************************
1101 * GetCodeHandle (KERNEL.93)
1103 HANDLE16 WINAPI GetCodeHandle( FARPROC16 proc )
1105 HANDLE16 handle;
1106 BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1108 /* Return the code segment containing 'proc'. */
1109 /* Not sure if this is really correct (shouldn't matter that much). */
1111 /* Check if it is really a thunk */
1112 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1113 handle = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
1114 else
1115 handle = GlobalHandle16( HIWORD(proc) );
1117 return handle;
1120 /**********************************************************************
1121 * GetCodeInfo (KERNEL.104)
1123 VOID WINAPI GetCodeInfo( FARPROC16 proc, SEGINFO *segInfo )
1125 BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1126 NE_MODULE *pModule = NULL;
1127 SEGTABLEENTRY *pSeg = NULL;
1128 WORD segNr;
1130 /* proc is either a thunk, or else a pair of module handle
1131 and segment number. In the first case, we also need to
1132 extract module and segment number. */
1134 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1136 WORD selector = thunk[6] + (thunk[7] << 8);
1137 pModule = NE_GetPtr( GlobalHandle16( selector ) );
1138 pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
1140 if ( pModule )
1141 for ( segNr = 0; segNr < pModule->seg_count; segNr++, pSeg++ )
1142 if ( GlobalHandleToSel(pSeg->hSeg) == selector )
1143 break;
1145 if ( pModule && segNr >= pModule->seg_count )
1146 pSeg = NULL;
1148 else
1150 pModule = NE_GetPtr( HIWORD( proc ) );
1151 segNr = LOWORD( proc );
1153 if ( pModule && segNr < pModule->seg_count )
1154 pSeg = NE_SEG_TABLE( pModule ) + segNr;
1157 /* fill in segment information */
1159 segInfo->offSegment = pSeg? pSeg->filepos : 0;
1160 segInfo->cbSegment = pSeg? pSeg->size : 0;
1161 segInfo->flags = pSeg? pSeg->flags : 0;
1162 segInfo->cbAlloc = pSeg? pSeg->minsize : 0;
1163 segInfo->h = pSeg? pSeg->hSeg : 0;
1164 segInfo->alignShift = pModule? pModule->alignment : 0;
1168 /**********************************************************************
1169 * DefineHandleTable16 (KERNEL.94)
1171 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1173 return TRUE; /* FIXME */
1177 /***********************************************************************
1178 * SetTaskQueue (KERNEL.34)
1180 HQUEUE16 WINAPI SetTaskQueue( HTASK16 hTask, HQUEUE16 hQueue )
1182 HQUEUE16 hPrev;
1183 TDB *pTask;
1185 if (!hTask) hTask = GetCurrentTask();
1186 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1188 hPrev = pTask->hQueue;
1189 pTask->hQueue = hQueue;
1191 TIMER_SwitchQueue( hPrev, hQueue );
1193 return hPrev;
1197 /***********************************************************************
1198 * GetTaskQueue (KERNEL.35)
1200 HQUEUE16 WINAPI GetTaskQueue( HTASK16 hTask )
1202 TDB *pTask;
1204 if (!hTask) hTask = GetCurrentTask();
1205 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1206 return pTask->hQueue;
1209 /***********************************************************************
1210 * SetThreadQueue (KERNEL.463)
1212 HQUEUE16 WINAPI SetThreadQueue( DWORD thread, HQUEUE16 hQueue )
1214 THDB *thdb = THREAD_IdToTHDB( thread );
1215 HQUEUE16 oldQueue = thdb? thdb->teb.queue : 0;
1217 if ( thdb )
1219 thdb->teb.queue = hQueue;
1221 if ( GetTaskQueue( thdb->process->task ) == oldQueue )
1222 SetTaskQueue( thdb->process->task, hQueue );
1225 return oldQueue;
1228 /***********************************************************************
1229 * GetThreadQueue (KERNEL.464)
1231 HQUEUE16 WINAPI GetThreadQueue( DWORD thread )
1233 THDB *thdb = THREAD_IdToTHDB( thread );
1234 return (HQUEUE16)(thdb? thdb->teb.queue : 0);
1237 /***********************************************************************
1238 * SetFastQueue (KERNEL.624)
1240 VOID WINAPI SetFastQueue( DWORD thread, HANDLE32 hQueue )
1242 THDB *thdb = THREAD_IdToTHDB( thread );
1243 if ( thdb ) thdb->teb.queue = (HQUEUE16) hQueue;
1246 /***********************************************************************
1247 * GetFastQueue (KERNEL.625)
1249 HANDLE32 WINAPI GetFastQueue( void )
1251 THDB *thdb = THREAD_Current();
1252 if (!thdb) return 0;
1254 if (!(thdb->teb.queue))
1256 HMODULE16 hModule = GetModuleHandle16( "USER" );
1257 FARPROC16 proc = WIN32_GetProcAddress16( hModule, "InitThreadInput" );
1258 Callbacks->CallBootAppProc( proc, 0, 4 ); /* FIXME! */
1261 if (!(thdb->teb.queue))
1262 FIXME( task, "(): should initialize thread-local queue, expect failure!\n" );
1264 return (HANDLE32)thdb->teb.queue;
1267 /***********************************************************************
1268 * SwitchStackTo (KERNEL.108)
1270 void WINAPI SwitchStackTo( WORD seg, WORD ptr, WORD top )
1272 TDB *pTask;
1273 STACK16FRAME *oldFrame, *newFrame;
1274 INSTANCEDATA *pData;
1275 UINT16 copySize;
1277 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1278 if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1279 TRACE(task, "old=%04x:%04x new=%04x:%04x\n",
1280 SELECTOROF( pTask->thdb->cur_stack ),
1281 OFFSETOF( pTask->thdb->cur_stack ), seg, ptr );
1283 /* Save the old stack */
1285 oldFrame = THREAD_STACK16( pTask->thdb );
1286 /* pop frame + args and push bp */
1287 pData->old_ss_sp = pTask->thdb->cur_stack + sizeof(STACK16FRAME)
1288 + 2 * sizeof(WORD);
1289 *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp) = oldFrame->bp;
1290 pData->stacktop = top;
1291 pData->stackmin = ptr;
1292 pData->stackbottom = ptr;
1294 /* Switch to the new stack */
1296 /* Note: we need to take the 3 arguments into account; otherwise,
1297 * the stack will underflow upon return from this function.
1299 copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1300 copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1301 pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg, ptr - copySize );
1302 newFrame = THREAD_STACK16( pTask->thdb );
1304 /* Copy the stack frame and the local variables to the new stack */
1306 memmove( newFrame, oldFrame, copySize );
1307 newFrame->bp = ptr;
1308 *(WORD *)PTR_SEG_OFF_TO_LIN( seg, ptr ) = 0; /* clear previous bp */
1312 /***********************************************************************
1313 * SwitchStackBack (KERNEL.109)
1315 void WINAPI SwitchStackBack( CONTEXT *context )
1317 TDB *pTask;
1318 STACK16FRAME *oldFrame, *newFrame;
1319 INSTANCEDATA *pData;
1321 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1322 if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(pTask->thdb->cur_stack))))
1323 return;
1324 if (!pData->old_ss_sp)
1326 WARN( task, "No previous SwitchStackTo\n" );
1327 return;
1329 TRACE(task, "restoring stack %04x:%04x\n",
1330 SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1332 oldFrame = THREAD_STACK16( pTask->thdb );
1334 /* Pop bp from the previous stack */
1336 BP_reg(context) = *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp);
1337 pData->old_ss_sp += sizeof(WORD);
1339 /* Switch back to the old stack */
1341 pTask->thdb->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1342 SS_reg(context) = SELECTOROF(pData->old_ss_sp);
1343 ESP_reg(context) = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1344 pData->old_ss_sp = 0;
1346 /* Build a stack frame for the return */
1348 newFrame = THREAD_STACK16( pTask->thdb );
1349 newFrame->frame32 = oldFrame->frame32;
1350 if (TRACE_ON(relay))
1352 newFrame->entry_ip = oldFrame->entry_ip;
1353 newFrame->entry_cs = oldFrame->entry_cs;
1358 /***********************************************************************
1359 * GetTaskQueueDS (KERNEL.118)
1361 void WINAPI GetTaskQueueDS( CONTEXT *context )
1363 DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1367 /***********************************************************************
1368 * GetTaskQueueES (KERNEL.119)
1370 void WINAPI GetTaskQueueES( CONTEXT *context )
1372 ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1376 /***********************************************************************
1377 * GetCurrentTask (KERNEL.36)
1379 HTASK16 WINAPI GetCurrentTask(void)
1381 return THREAD_InitDone? PROCESS_Current()->task : 0;
1384 DWORD WINAPI WIN16_GetCurrentTask(void)
1386 /* This is the version used by relay code; the first task is */
1387 /* returned in the high word of the result */
1388 return MAKELONG( GetCurrentTask(), hFirstTask );
1392 /***********************************************************************
1393 * GetCurrentPDB (KERNEL.37)
1395 HANDLE16 WINAPI GetCurrentPDB(void)
1397 TDB *pTask;
1399 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1400 return pTask->hPDB;
1404 /***********************************************************************
1405 * GetInstanceData (KERNEL.54)
1407 INT16 WINAPI GetInstanceData( HINSTANCE16 instance, WORD buffer, INT16 len )
1409 char *ptr = (char *)GlobalLock16( instance );
1410 if (!ptr || !len) return 0;
1411 if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1412 memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1413 return len;
1417 /***********************************************************************
1418 * GetExeVersion (KERNEL.105)
1420 WORD WINAPI GetExeVersion(void)
1422 TDB *pTask;
1424 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1425 return pTask->version;
1429 /***********************************************************************
1430 * SetErrorMode16 (KERNEL.107)
1432 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1434 TDB *pTask;
1435 UINT16 oldMode;
1437 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1438 oldMode = pTask->error_mode;
1439 pTask->error_mode = mode;
1440 pTask->thdb->process->error_mode = mode;
1441 return oldMode;
1445 /***********************************************************************
1446 * SetErrorMode32 (KERNEL32.486)
1448 UINT32 WINAPI SetErrorMode32( UINT32 mode )
1450 return SetErrorMode16( (UINT16)mode );
1454 /***********************************************************************
1455 * GetDOSEnvironment (KERNEL.131)
1457 SEGPTR WINAPI GetDOSEnvironment(void)
1459 TDB *pTask;
1461 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1462 return PTR_SEG_OFF_TO_SEGPTR( pTask->pdb.environment, 0 );
1466 /***********************************************************************
1467 * GetNumTasks (KERNEL.152)
1469 UINT16 WINAPI GetNumTasks(void)
1471 return nTaskCount;
1475 /***********************************************************************
1476 * GetTaskDS (KERNEL.155)
1478 * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1479 * I don't think we need to bother with this.
1481 HINSTANCE16 WINAPI GetTaskDS(void)
1483 TDB *pTask;
1485 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1486 return pTask->hInstance;
1490 /***********************************************************************
1491 * IsTask (KERNEL.320)
1493 BOOL16 WINAPI IsTask( HTASK16 hTask )
1495 TDB *pTask;
1497 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1498 if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1499 return (pTask->magic == TDB_MAGIC);
1503 /***********************************************************************
1504 * SetTaskSignalProc (KERNEL.38)
1506 * Real 16-bit interface is provided by the THUNK_SetTaskSignalProc.
1508 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1510 TDB *pTask;
1511 FARPROC16 oldProc;
1513 if (!hTask) hTask = GetCurrentTask();
1514 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
1515 oldProc = (FARPROC16)pTask->userhandler;
1516 pTask->userhandler = (USERSIGNALPROC)proc;
1517 return oldProc;
1521 /***********************************************************************
1522 * SetSigHandler (KERNEL.140)
1524 WORD WINAPI SetSigHandler( FARPROC16 newhandler, FARPROC16* oldhandler,
1525 UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1527 FIXME(task,"(%p,%p,%p,%d,%d), unimplemented.\n",
1528 newhandler,oldhandler,oldmode,newmode,flag );
1530 if (flag != 1) return 0;
1531 if (!newmode) newhandler = NULL; /* Default handler */
1532 if (newmode != 4)
1534 TDB *pTask;
1536 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1537 if (oldmode) *oldmode = pTask->signal_flags;
1538 pTask->signal_flags = newmode;
1539 if (oldhandler) *oldhandler = pTask->sighandler;
1540 pTask->sighandler = newhandler;
1542 return 0;
1546 /***********************************************************************
1547 * GlobalNotify (KERNEL.154)
1549 VOID WINAPI GlobalNotify( FARPROC16 proc )
1551 TDB *pTask;
1553 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1554 pTask->discardhandler = proc;
1558 /***********************************************************************
1559 * GetExePtr (KERNEL.133)
1561 static HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1563 char *ptr;
1564 HANDLE16 owner;
1566 /* Check for module handle */
1568 if (!(ptr = GlobalLock16( handle ))) return 0;
1569 if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1571 /* Search for this handle inside all tasks */
1573 *hTask = hFirstTask;
1574 while (*hTask)
1576 TDB *pTask = (TDB *)GlobalLock16( *hTask );
1577 if ((*hTask == handle) ||
1578 (pTask->hInstance == handle) ||
1579 (pTask->hQueue == handle) ||
1580 (pTask->hPDB == handle)) return pTask->hModule;
1581 *hTask = pTask->hNext;
1584 /* Check the owner for module handle */
1586 owner = FarGetOwner( handle );
1587 if (!(ptr = GlobalLock16( owner ))) return 0;
1588 if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1590 /* Search for the owner inside all tasks */
1592 *hTask = hFirstTask;
1593 while (*hTask)
1595 TDB *pTask = (TDB *)GlobalLock16( *hTask );
1596 if ((*hTask == owner) ||
1597 (pTask->hInstance == owner) ||
1598 (pTask->hQueue == owner) ||
1599 (pTask->hPDB == owner)) return pTask->hModule;
1600 *hTask = pTask->hNext;
1603 return 0;
1606 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1608 HTASK16 dummy;
1609 return GetExePtrHelper( handle, &dummy );
1612 void WINAPI WIN16_GetExePtr( CONTEXT *context )
1614 WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1615 HANDLE16 handle = (HANDLE16)stack[2];
1616 HTASK16 hTask = 0;
1617 HMODULE16 hModule;
1619 hModule = GetExePtrHelper( handle, &hTask );
1621 AX_reg(context) = CX_reg(context) = hModule;
1622 if (hTask) ES_reg(context) = hTask;
1625 /***********************************************************************
1626 * TaskFirst (TOOLHELP.63)
1628 BOOL16 WINAPI TaskFirst( TASKENTRY *lpte )
1630 lpte->hNext = hFirstTask;
1631 return TaskNext( lpte );
1635 /***********************************************************************
1636 * TaskNext (TOOLHELP.64)
1638 BOOL16 WINAPI TaskNext( TASKENTRY *lpte )
1640 TDB *pTask;
1641 INSTANCEDATA *pInstData;
1643 TRACE(toolhelp, "(%p): task=%04x\n", lpte, lpte->hNext );
1644 if (!lpte->hNext) return FALSE;
1645 pTask = (TDB *)GlobalLock16( lpte->hNext );
1646 if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1647 pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
1648 lpte->hTask = lpte->hNext;
1649 lpte->hTaskParent = pTask->hParent;
1650 lpte->hInst = pTask->hInstance;
1651 lpte->hModule = pTask->hModule;
1652 lpte->wSS = SELECTOROF( pTask->thdb->cur_stack );
1653 lpte->wSP = OFFSETOF( pTask->thdb->cur_stack );
1654 lpte->wStackTop = pInstData->stacktop;
1655 lpte->wStackMinimum = pInstData->stackmin;
1656 lpte->wStackBottom = pInstData->stackbottom;
1657 lpte->wcEvents = pTask->nEvents;
1658 lpte->hQueue = pTask->hQueue;
1659 strncpy( lpte->szModule, pTask->module_name, 8 );
1660 lpte->szModule[8] = '\0';
1661 lpte->wPSPOffset = 0x100; /*??*/
1662 lpte->hNext = pTask->hNext;
1663 return TRUE;
1667 /***********************************************************************
1668 * TaskFindHandle (TOOLHELP.65)
1670 BOOL16 WINAPI TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
1672 lpte->hNext = hTask;
1673 return TaskNext( lpte );
1677 /***********************************************************************
1678 * GetAppCompatFlags16 (KERNEL.354)
1680 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1682 return GetAppCompatFlags32( hTask );
1686 /***********************************************************************
1687 * GetAppCompatFlags32 (USER32.206)
1689 DWORD WINAPI GetAppCompatFlags32( HTASK32 hTask )
1691 TDB *pTask;
1693 if (!hTask) hTask = GetCurrentTask();
1694 if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
1695 if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1696 return pTask->compat_flags;