1 /*
2 * Task functions
3 *
4 * Copyright 1995 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <stdarg.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <assert.h>
28 #ifdef HAVE_UNISTD_H
29 # include <unistd.h>
30 #endif
31
32 #include "windef.h"
33 #include "winbase.h"
34 #include "wingdi.h"
35 #include "winnt.h"
36 #include "wownt32.h"
37 #include "winuser.h"
38
39 #include "wine/winbase16.h"
40 #include "winternl.h"
41 #include "toolhelp.h"
42 #include "kernel_private.h"
43 #include "kernel16_private.h"
44
45 #include "wine/debug.h"
46
47 WINE_DEFAULT_DEBUG_CHANNEL(task);
48 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
49
50 #include "pshpack1.h"
51
52 /* Segment containing MakeProcInstance() thunks */
53 typedef struct
54 {
55 WORD next; /* Selector of next segment */
56 WORD magic; /* Thunks signature */
57 WORD unused;
58 WORD free; /* Head of the free list */
59 WORD thunks[4]; /* Each thunk is 4 words long */
60 } THUNKS;
61
62 #include "poppack.h"
63
64 #define THUNK_MAGIC ('P' | ('T' << 8))
65
66 /* Min. number of thunks allocated when creating a new segment */
67 #define MIN_THUNKS 32
68
69 #define TDB_MAGIC ('T' | ('D' << 8))
70
71 static THHOOK DefaultThhook;
72 THHOOK *pThhook = &DefaultThhook;
73
74 #define hFirstTask (pThhook->HeadTDB)
75 #define hLockedTask (pThhook->LockTDB)
76
77 static UINT16 nTaskCount = 0;
78
79 static HTASK16 initial_task, main_task;
80
81 /***********************************************************************
82 * TASK_InstallTHHook
83 */
84 void TASK_InstallTHHook( THHOOK *pNewThhook )
85 {
86 THHOOK *pOldThhook = pThhook;
87
88 pThhook = pNewThhook? pNewThhook : &DefaultThhook;
89
90 *pThhook = *pOldThhook;
91 }
92
93 /***********************************************************************
94 * TASK_GetPtr
95 */
96 static TDB *TASK_GetPtr( HTASK16 hTask )
97 {
98 return GlobalLock16( hTask );
99 }
100
101
102 /***********************************************************************
103 * TASK_GetCurrent
104 */
105 TDB *TASK_GetCurrent(void)
106 {
107 return TASK_GetPtr( GetCurrentTask() );
108 }
109
110
111 /***********************************************************************
112 * TASK_LinkTask
113 */
114 static void TASK_LinkTask( HTASK16 hTask )
115 {
116 HTASK16 *prevTask;
117 TDB *pTask;
118
119 if (!(pTask = TASK_GetPtr( hTask ))) return;
120 prevTask = &hFirstTask;
121 while (*prevTask)
122 {
123 TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
124 if (prevTaskPtr->priority >= pTask->priority) break;
125 prevTask = &prevTaskPtr->hNext;
126 }
127 pTask->hNext = *prevTask;
128 *prevTask = hTask;
129 nTaskCount++;
130 }
131
132
133 /***********************************************************************
134 * TASK_UnlinkTask
135 */
136 static void TASK_UnlinkTask( HTASK16 hTask )
137 {
138 HTASK16 *prevTask;
139 TDB *pTask;
140
141 prevTask = &hFirstTask;
142 while (*prevTask && (*prevTask != hTask))
143 {
144 pTask = TASK_GetPtr( *prevTask );
145 prevTask = &pTask->hNext;
146 }
147 if (*prevTask)
148 {
149 pTask = TASK_GetPtr( *prevTask );
150 *prevTask = pTask->hNext;
151 pTask->hNext = 0;
152 nTaskCount--;
153 }
154 }
155
156
157 /***********************************************************************
158 * TASK_CreateThunks
159 *
160 * Create a thunk free-list in segment 'handle', starting from offset 'offset'
161 * and containing 'count' entries.
162 */
163 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
164 {
165 int i;
166 WORD free;
167 THUNKS *pThunk;
168
169 pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
170 pThunk->next = 0;
171 pThunk->magic = THUNK_MAGIC;
172 pThunk->free = (int)&pThunk->thunks - (int)pThunk;
173 free = pThunk->free;
174 for (i = 0; i < count-1; i++)
175 {
176 free += 8; /* Offset of next thunk */
177 pThunk->thunks[4*i] = free;
178 }
179 pThunk->thunks[4*i] = 0; /* Last thunk */
180 }
181
182
183 /***********************************************************************
184 * TASK_AllocThunk
185 *
186 * Allocate a thunk for MakeProcInstance().
187 */
188 static SEGPTR TASK_AllocThunk(void)
189 {
190 TDB *pTask;
191 THUNKS *pThunk;
192 WORD sel, base;
193
194 if (!(pTask = TASK_GetCurrent())) return 0;
195 sel = pTask->hCSAlias;
196 pThunk = (THUNKS *)&pTask->thunks;
197 base = (char *)pThunk - (char *)pTask;
198 while (!pThunk->free)
199 {
200 sel = pThunk->next;
201 if (!sel) /* Allocate a new segment */
202 {
203 sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
204 pTask->hPDB, WINE_LDT_FLAGS_CODE );
205 if (!sel) return (SEGPTR)0;
206 TASK_CreateThunks( sel, 0, MIN_THUNKS );
207 pThunk->next = sel;
208 }
209 pThunk = (THUNKS *)GlobalLock16( sel );
210 base = 0;
211 }
212 base += pThunk->free;
213 pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
214 return MAKESEGPTR( sel, base );
215 }
216
217
218 /***********************************************************************
219 * TASK_FreeThunk
220 *
221 * Free a MakeProcInstance() thunk.
222 */
223 static BOOL TASK_FreeThunk( SEGPTR thunk )
224 {
225 TDB *pTask;
226 THUNKS *pThunk;
227 WORD sel, base;
228
229 if (!(pTask = TASK_GetCurrent())) return 0;
230 sel = pTask->hCSAlias;
231 pThunk = (THUNKS *)&pTask->thunks;
232 base = (char *)pThunk - (char *)pTask;
233 while (sel && (sel != HIWORD(thunk)))
234 {
235 sel = pThunk->next;
236 pThunk = (THUNKS *)GlobalLock16( sel );
237 base = 0;
238 }
239 if (!sel) return FALSE;
240 *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
241 pThunk->free = LOWORD(thunk) - base;
242 return TRUE;
243 }
244
245
246 /***********************************************************************
247 * TASK_Create
248 *
249 * NOTE: This routine might be called by a Win32 thread. Thus, we need
250 * to be careful to protect global data structures. We do this
251 * by entering the Win16Lock while linking the task into the
252 * global task list.
253 */
254 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
255 {
256 HTASK16 hTask;
257 TDB *pTask;
258 FARPROC16 proc;
259 char curdir[MAX_PATH];
260 HMODULE16 hModule = pModule ? pModule->self : 0;
261
262 /* Allocate the task structure */
263
264 hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
265 if (!hTask) return NULL;
266 pTask = TASK_GetPtr( hTask );
267 FarSetOwner16( hTask, hModule );
268
269 /* Fill the task structure */
270
271 pTask->hSelf = hTask;
272
273 pTask->version = pModule ? pModule->ne_expver : 0x0400;
274 pTask->hModule = hModule;
275 pTask->hParent = GetCurrentTask();
276 pTask->magic = TDB_MAGIC;
277 pTask->nCmdShow = cmdShow;
278
279 GetCurrentDirectoryA( sizeof(curdir), curdir );
280 GetShortPathNameA( curdir, curdir, sizeof(curdir) );
281 pTask->curdrive = (curdir[0] - 'A') | 0x80;
282 lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
283
284 /* Create the thunks block */
285
286 TASK_CreateThunks( hTask, (char *)&pTask->thunks - (char *)pTask, 7 );
287
288 /* Copy the module name */
289
290 if (hModule)
291 {
292 char name[sizeof(pTask->module_name)+1];
293 size_t len;
294 GetModuleName16( hModule, name, sizeof(name) );
295 len = strlen(name) + 1;
296 memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
297 pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
298 }
299
300 /* Allocate a selector for the PDB */
301
302 pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
303 hModule, WINE_LDT_FLAGS_DATA );
304
305 /* Fill the PDB */
306
307 pTask->pdb.int20 = 0x20cd;
308 pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
309 proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
310 memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
311 pTask->pdb.savedint22 = 0;
312 pTask->pdb.savedint23 = 0;
313 pTask->pdb.savedint24 = 0;
314 pTask->pdb.fileHandlesPtr =
315 MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
316 pTask->pdb.hFileHandles = 0;
317 memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
318 /* FIXME: should we make a copy of the environment? */
319 pTask->pdb.environment = SELECTOROF(GetDOSEnvironment16());
320 pTask->pdb.nbFiles = 20;
321
322 /* Fill the command line */
323
324 if (!cmdline)
325 {
326 cmdline = GetCommandLineA();
327 /* remove the first word (program name) */
328 if (*cmdline == '"')
329 if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
330 while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
331 while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
332 len = strlen(cmdline);
333 }
334 if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
335 pTask->pdb.cmdLine[0] = len;
336 memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
337 /* pTask->pdb.cmdLine[len+1] = 0; */
338
339 TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
340
341 /* Allocate a code segment alias for the TDB */
342
343 pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
344 sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
345
346 /* Default DTA overwrites command line */
347
348 pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
349
350 /* Create scheduler event for 16-bit tasks */
351
352 if ( !(pTask->flags & TDBF_WIN32) )
353 NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
354
355 if (!initial_task) initial_task = hTask;
356
357 return pTask;
358 }
359
360
361 /***********************************************************************
362 * TASK_DeleteTask
363 */
364 static void TASK_DeleteTask( HTASK16 hTask )
365 {
366 TDB *pTask;
367 HGLOBAL16 hPDB;
368
369 if (!(pTask = TASK_GetPtr( hTask ))) return;
370 hPDB = pTask->hPDB;
371
372 pTask->magic = 0xdead; /* invalidate signature */
373
374 /* Free the selector aliases */
375
376 GLOBAL_FreeBlock( pTask->hCSAlias );
377 GLOBAL_FreeBlock( pTask->hPDB );
378
379 /* Free the task module */
380
381 FreeModule16( pTask->hModule );
382
383 /* Free the task structure itself */
384
385 GlobalFree16( hTask );
386
387 /* Free all memory used by this task (including the 32-bit stack, */
388 /* the environment block and the thunk segments). */
389
390 GlobalFreeAll16( hPDB );
391 }
392
393
394 /***********************************************************************
395 * TASK_CreateMainTask
396 *
397 * Create a task for the main (32-bit) process.
398 */
399 void TASK_CreateMainTask(void)
400 {
401 TDB *pTask;
402 STARTUPINFOA startup_info;
403 UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
404
405 GetStartupInfoA( &startup_info );
406 if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
407 pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
408 if (!pTask)
409 {
410 ERR("could not create task for main process\n");
411 ExitProcess(1);
412 }
413
414 pTask->flags |= TDBF_WIN32;
415 pTask->hInstance = 0;
416 pTask->hPrevInstance = 0;
417 pTask->teb = NtCurrentTeb();
418
419 /* Add the task to the linked list */
420 /* (no need to get the win16 lock, we are the only thread at this point) */
421 TASK_LinkTask( pTask->hSelf );
422 main_task = pTask->hSelf;
423 }
424
425
426 struct create_data
427 {
428 TDB *task;
429 WIN16_SUBSYSTEM_TIB *tib;
430 };
431
432 /* allocate the win16 TIB for a new 16-bit task */
433 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
434 {
435 WCHAR path[MAX_PATH];
436 WIN16_SUBSYSTEM_TIB *tib;
437 UNICODE_STRING *curdir;
438 NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
439
440 if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
441 MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
442 GetLongPathNameW( path, path, MAX_PATH );
443 if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
444 else tib->exe_name = NULL;
445
446 RtlAcquirePebLock();
447 if (NtCurrentTeb()->Tib.SubSystemTib)
448 curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
449 else
450 curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
451 tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
452 tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
453 tib->curdir.DosPath.Buffer = tib->curdir_buffer;
454 tib->curdir.Handle = 0;
455 memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
456 tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
457 RtlReleasePebLock();
458 return tib;
459 }
460
461 static inline void free_win16_tib( WIN16_SUBSYSTEM_TIB *tib )
462 {
463 if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
464 HeapFree( GetProcessHeap(), 0, tib );
465 }
466
467 /* startup routine for a new 16-bit thread */
468 static DWORD CALLBACK task_start( LPVOID p )
469 {
470 struct create_data *data = p;
471 TDB *pTask = data->task;
472 DWORD ret;
473
474 kernel_get_thread_data()->htask16 = pTask->hSelf;
475 NtCurrentTeb()->Tib.SubSystemTib = data->tib;
476 HeapFree( GetProcessHeap(), 0, data );
477
478 _EnterWin16Lock();
479 TASK_LinkTask( pTask->hSelf );
480 pTask->teb = NtCurrentTeb();
481 ret = NE_StartTask();
482 _LeaveWin16Lock();
483 return ret;
484 }
485
486
487 /***********************************************************************
488 * TASK_SpawnTask
489 *
490 * Spawn a new 16-bit task.
491 */
492 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
493 LPCSTR cmdline, BYTE len, HANDLE *hThread )
494 {
495 struct create_data *data = NULL;
496 WIN16_SUBSYSTEM_TIB *tib;
497 TDB *pTask;
498
499 if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
500 if (!(tib = allocate_win16_tib( pTask ))) goto failed;
501 if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data)))) goto failed;
502 data->task = pTask;
503 data->tib = tib;
504 if (!(*hThread = CreateThread( NULL, 0, task_start, data, 0, NULL ))) goto failed;
505 return pTask->hSelf;
506
507 failed:
508 if (tib) free_win16_tib( tib );
509 HeapFree( GetProcessHeap(), 0, data );
510 TASK_DeleteTask( pTask->hSelf );
511 return 0;
512 }
513
514
515 /***********************************************************************
516 * TASK_GetTaskFromThread
517 */
518 HTASK16 TASK_GetTaskFromThread( DWORD thread )
519 {
520 TDB *p = TASK_GetPtr( hFirstTask );
521 while (p)
522 {
523 if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
524 p = TASK_GetPtr( p->hNext );
525 }
526 return 0;
527 }
528
529
530 /***********************************************************************
531 * TASK_CallTaskSignalProc
532 */
533 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
534 {
535 WORD args[5];
536 TDB *pTask = TASK_GetCurrent();
537
538 if ( !pTask || !pTask->userhandler ) return;
539
540 args[4] = hTaskOrModule;
541 args[3] = uCode;
542 args[2] = 0;
543 args[1] = pTask->hInstance;
544 args[0] = pTask->hQueue;
545 WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
546 }
547
548
549 /***********************************************************************
550 * TASK_ExitTask
551 */
552 void TASK_ExitTask(void)
553 {
554 WIN16_SUBSYSTEM_TIB *tib;
555 TDB *pTask;
556 DWORD lockCount;
557
558 /* Enter the Win16Lock to protect global data structures */
559 _EnterWin16Lock();
560
561 pTask = TASK_GetCurrent();
562 if ( !pTask )
563 {
564 _LeaveWin16Lock();
565 return;
566 }
567
568 TRACE("Killing task %04x\n", pTask->hSelf );
569
570 /* Perform USER cleanup */
571
572 TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
573
574 /* Remove the task from the list to be sure we never switch back to it */
575 TASK_UnlinkTask( pTask->hSelf );
576
577 if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
578 {
579 TRACE("this is the last task, exiting\n" );
580 ExitKernel16();
581 }
582
583 pTask->nEvents = 0;
584
585 if ( hLockedTask == pTask->hSelf )
586 hLockedTask = 0;
587
588 TASK_DeleteTask( pTask->hSelf );
589
590 if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
591 {
592 free_win16_tib( tib );
593 NtCurrentTeb()->Tib.SubSystemTib = NULL;
594 }
595
596 /* ... and completely release the Win16Lock, just in case. */
597 ReleaseThunkLock( &lockCount );
598 }
599
600
601 /***********************************************************************
602 * ExitKernel (KERNEL.2)
603 *
604 * Clean-up everything and exit the Wine process.
605 */
606 void WINAPI ExitKernel16(void)
607 {
608 WriteOutProfiles16();
609 TerminateProcess( GetCurrentProcess(), 0 );
610 }
611
612
613 /***********************************************************************
614 * InitTask (KERNEL.91)
615 *
616 * Called by the application startup code.
617 */
618 void WINAPI InitTask16( CONTEXT86 *context )
619 {
620 TDB *pTask;
621 INSTANCEDATA *pinstance;
622 SEGPTR ptr;
623
624 context->Eax = 0;
625 if (!(pTask = TASK_GetCurrent())) return;
626
627 /* Note: we need to trust that BX/CX contain the stack/heap sizes,
628 as some apps, notably Visual Basic apps, *modify* the heap/stack
629 size of the instance data segment before calling InitTask() */
630
631 /* Initialize the INSTANCEDATA structure */
632 pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
633 pinstance->stackmin = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
634 pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
635 pinstance->stacktop = ( pinstance->stackmin > LOWORD(context->Ebx) ?
636 pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
637
638 /* Initialize the local heap */
639 if (LOWORD(context->Ecx))
640 LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
641
642 /* Initialize implicitly loaded DLLs */
643 NE_InitializeDLLs( pTask->hModule );
644 NE_DllProcessAttach( pTask->hModule );
645
646 /* Registers on return are:
647 * ax 1 if OK, 0 on error
648 * cx stack limit in bytes
649 * dx cmdShow parameter
650 * si instance handle of the previous instance
651 * di instance handle of the new task
652 * es:bx pointer to command line inside PSP
653 *
654 * 0 (=%bp) is pushed on the stack
655 */
656 ptr = stack16_push( sizeof(WORD) );
657 *(WORD *)MapSL(ptr) = 0;
658 context->Esp -= 2;
659
660 context->Eax = 1;
661
662 if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
663 else
664 {
665 LPBYTE p = &pTask->pdb.cmdLine[1];
666 while ((*p == ' ') || (*p == '\t')) p++;
667 context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
668 }
669 context->Ecx = pinstance->stacktop;
670 context->Edx = pTask->nCmdShow;
671 context->Esi = (DWORD)pTask->hPrevInstance;
672 context->Edi = (DWORD)pTask->hInstance;
673 context->SegEs = (WORD)pTask->hPDB;
674 }
675
676
677 /***********************************************************************
678 * WaitEvent (KERNEL.30)
679 */
680 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
681 {
682 TDB *pTask;
683
684 if (!hTask) hTask = GetCurrentTask();
685 pTask = TASK_GetPtr( hTask );
686
687 if (pTask->flags & TDBF_WIN32)
688 {
689 FIXME("called for Win32 thread (%04x)!\n", GetCurrentThreadId());
690 return TRUE;
691 }
692
693 if (pTask->nEvents > 0)
694 {
695 pTask->nEvents--;
696 return FALSE;
697 }
698
699 if (pTask->teb == NtCurrentTeb())
700 {
701 DWORD lockCount;
702
703 NtResetEvent( pTask->hEvent, NULL );
704 ReleaseThunkLock( &lockCount );
705 SYSLEVEL_CheckNotLevel( 1 );
706 WaitForSingleObject( pTask->hEvent, INFINITE );
707 RestoreThunkLock( lockCount );
708 if (pTask->nEvents > 0) pTask->nEvents--;
709 }
710 else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
711
712 return TRUE;
713 }
714
715
716 /***********************************************************************
717 * PostEvent (KERNEL.31)
718 */
719 void WINAPI PostEvent16( HTASK16 hTask )
720 {
721 TDB *pTask;
722
723 if (!hTask) hTask = GetCurrentTask();
724 if (!(pTask = TASK_GetPtr( hTask ))) return;
725
726 if (pTask->flags & TDBF_WIN32)
727 {
728 FIXME("called for Win32 thread (%04x)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
729 return;
730 }
731
732 pTask->nEvents++;
733
734 if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
735 }
736
737
738 /***********************************************************************
739 * SetPriority (KERNEL.32)
740 */
741 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
742 {
743 TDB *pTask;
744 INT16 newpriority;
745
746 if (!hTask) hTask = GetCurrentTask();
747 if (!(pTask = TASK_GetPtr( hTask ))) return;
748 newpriority = pTask->priority + delta;
749 if (newpriority < -32) newpriority = -32;
750 else if (newpriority > 15) newpriority = 15;
751
752 pTask->priority = newpriority + 1;
753 TASK_UnlinkTask( pTask->hSelf );
754 TASK_LinkTask( pTask->hSelf );
755 pTask->priority--;
756 }
757
758
759 /***********************************************************************
760 * LockCurrentTask (KERNEL.33)
761 */
762 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
763 {
764 if (bLock) hLockedTask = GetCurrentTask();
765 else hLockedTask = 0;
766 return hLockedTask;
767 }
768
769
770 /***********************************************************************
771 * IsTaskLocked (KERNEL.122)
772 */
773 HTASK16 WINAPI IsTaskLocked16(void)
774 {
775 return hLockedTask;
776 }
777
778
779 /***********************************************************************
780 * OldYield (KERNEL.117)
781 */
782 void WINAPI OldYield16(void)
783 {
784 DWORD count;
785
786 ReleaseThunkLock(&count);
787 RestoreThunkLock(count);
788 }
789
790 /***********************************************************************
791 * WIN32_OldYield (KERNEL.447)
792 */
793 void WINAPI WIN32_OldYield16(void)
794 {
795 DWORD count;
796
797 ReleaseThunkLock(&count);
798 RestoreThunkLock(count);
799 }
800
801 /***********************************************************************
802 * DirectedYield (KERNEL.150)
803 */
804 void WINAPI DirectedYield16( HTASK16 hTask )
805 {
806 OldYield16();
807 }
808
809 /***********************************************************************
810 * Yield (KERNEL.29)
811 */
812 void WINAPI Yield16(void)
813 {
814 TDB *pCurTask = TASK_GetCurrent();
815
816 if (pCurTask && pCurTask->hQueue)
817 {
818 HMODULE mod = GetModuleHandleA( "user32.dll" );
819 if (mod)
820 {
821 FARPROC proc = GetProcAddress( mod, "UserYield16" );
822 if (proc)
823 {
824 proc();
825 return;
826 }
827 }
828 }
829 OldYield16();
830 }
831
832 /***********************************************************************
833 * KERNEL_490 (KERNEL.490)
834 */
835 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
836 {
837 if ( !someTask ) return 0;
838
839 FIXME("(%04x): stub\n", someTask );
840 return 0;
841 }
842
843 /***********************************************************************
844 * MakeProcInstance (KERNEL.51)
845 */
846 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
847 {
848 BYTE *thunk,*lfunc;
849 SEGPTR thunkaddr;
850 WORD hInstanceSelector;
851
852 hInstanceSelector = GlobalHandleToSel16(hInstance);
853
854 TRACE("(%p, %04x);\n", func, hInstance);
855
856 if (!HIWORD(func)) {
857 /* Win95 actually protects via SEH, but this is better for debugging */
858 WARN("Ouch ! Called with invalid func %p !\n", func);
859 return (FARPROC16)0;
860 }
861
862 if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
863 && (hInstance != 0)
864 && (hInstance != 0xffff) )
865 {
866 /* calling MPI with a foreign DSEG is invalid ! */
867 WARN("Problem with hInstance? Got %04x, using %04x instead\n",
868 hInstance,CURRENT_DS);
869 }
870
871 /* Always use the DSEG that MPI was entered with.
872 * We used to set hInstance to GetTaskDS16(), but this should be wrong
873 * as CURRENT_DS provides the DSEG value we need.
874 * ("calling" DS, *not* "task" DS !) */
875 hInstanceSelector = CURRENT_DS;
876 hInstance = GlobalHandle16(hInstanceSelector);
877
878 /* no thunking for DLLs */
879 if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
880 return func;
881
882 thunkaddr = TASK_AllocThunk();
883 if (!thunkaddr) return (FARPROC16)0;
884 thunk = MapSL( thunkaddr );
885 lfunc = MapSL( (SEGPTR)func );
886
887 TRACE("(%p,%04x): got thunk %08x\n", func, hInstance, thunkaddr );
888 if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
889 ((lfunc[0]==0x1e) && (lfunc[1]==0x58)) /* pushw %ds, popw %ax */
890 ) {
891 WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
892 }
893
894 *thunk++ = 0xb8; /* movw instance, %ax */
895 *thunk++ = (BYTE)(hInstanceSelector & 0xff);
896 *thunk++ = (BYTE)(hInstanceSelector >> 8);
897 *thunk++ = 0xea; /* ljmp func */
898 *(DWORD *)thunk = (DWORD)func;
899 return (FARPROC16)thunkaddr;
900 /* CX reg indicates if thunkaddr != NULL, implement if needed */
901 }
902
903
904 /***********************************************************************
905 * FreeProcInstance (KERNEL.52)
906 */
907 void WINAPI FreeProcInstance16( FARPROC16 func )
908 {
909 TRACE("(%p)\n", func );
910 TASK_FreeThunk( (SEGPTR)func );
911 }
912
913 /**********************************************************************
914 * TASK_GetCodeSegment
915 *
916 * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
917 * and logical segment number of a given code segment.
918 *
919 * 'proc' either *is* already a pair of module handle and segment number,
920 * in which case there's nothing to do. Otherwise, it is a pointer to
921 * a function, and we need to retrieve the code segment. If the pointer
922 * happens to point to a thunk, we'll retrieve info about the code segment
923 * where the function pointed to by the thunk resides, not the thunk itself.
924 *
925 * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
926 * the function the snoop code will return to ...
927 *
928 */
929 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
930 SEGTABLEENTRY **ppSeg, int *pSegNr )
931 {
932 NE_MODULE *pModule = NULL;
933 SEGTABLEENTRY *pSeg = NULL;
934 int segNr=0;
935
936 /* Try pair of module handle / segment number */
937 pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
938 if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
939 {
940 segNr = LOWORD( proc );
941 if ( segNr && segNr <= pModule->ne_cseg )
942 pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
943 }
944
945 /* Try thunk or function */
946 else
947 {
948 BYTE *thunk = MapSL( (SEGPTR)proc );
949 WORD selector;
950
951 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
952 selector = thunk[6] + (thunk[7] << 8);
953 else
954 selector = HIWORD( proc );
955
956 pModule = NE_GetPtr( GlobalHandle16( selector ) );
957 pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
958
959 if ( pModule )
960 for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
961 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
962 break;
963
964 if ( pModule && segNr > pModule->ne_cseg )
965 pSeg = NULL;
966 }
967
968 /* Abort if segment not found */
969
970 if ( !pModule || !pSeg )
971 return FALSE;
972
973 /* Return segment data */
974
975 if ( ppModule ) *ppModule = pModule;
976 if ( ppSeg ) *ppSeg = pSeg;
977 if ( pSegNr ) *pSegNr = segNr;
978
979 return TRUE;
980 }
981
982 /**********************************************************************
983 * GetCodeHandle (KERNEL.93)
984 */
985 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
986 {
987 SEGTABLEENTRY *pSeg;
988
989 if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
990 return (HANDLE16)0;
991
992 return pSeg->hSeg;
993 }
994
995 /**********************************************************************
996 * GetCodeInfo (KERNEL.104)
997 */
998 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
999 {
1000 NE_MODULE *pModule;
1001 SEGTABLEENTRY *pSeg;
1002 int segNr;
1003
1004 if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1005 return FALSE;
1006
1007 /* Fill in segment information */
1008
1009 segInfo->offSegment = pSeg->filepos;
1010 segInfo->cbSegment = pSeg->size;
1011 segInfo->flags = pSeg->flags;
1012 segInfo->cbAlloc = pSeg->minsize;
1013 segInfo->h = pSeg->hSeg;
1014 segInfo->alignShift = pModule->ne_align;
1015
1016 if ( segNr == pModule->ne_autodata )
1017 segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
1018
1019 /* Return module handle in %es */
1020
1021 CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1022
1023 return TRUE;
1024 }
1025
1026
1027 /**********************************************************************
1028 * DefineHandleTable (KERNEL.94)
1029 */
1030 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1031 {
1032 FIXME("(%04x): stub ?\n", wOffset);
1033 return TRUE;
1034 }