4 * Copyright 1995 Alexandre Julliard
13 #include "directory.h"
29 /* Min. number of thunks allocated when creating a new segment */
32 /* 32-bit stack size for each task */
33 /* Must not be greater than 64k, or MAKE_SEGPTR won't work */
34 #define STACK32_SIZE 0x10000
36 extern void TIMER_SwitchQueue(HQUEUE, HQUEUE );
37 extern void USER_AppExit(HTASK, HINSTANCE, HQUEUE );
38 /* ------ Internal variables ------ */
40 static HTASK hFirstTask = 0;
41 static HTASK hCurrentTask = 0;
42 static HTASK hTaskToKill = 0;
43 static HTASK hLockedTask = 0;
44 static WORD nTaskCount = 0;
45 static HANDLE hDOSEnvironment = 0;
47 /* ------ Internal declarations ------ */
49 /* TASK_Reschedule() 16-bit entry point */
50 static FARPROC TASK_RescheduleProc;
53 #define TASK_SCHEDULE() TASK_Reschedule();
55 #define TASK_SCHEDULE() CallTo16_word_(TASK_RescheduleProc,0)
58 static HANDLE TASK_CreateDOSEnvironment(void);
60 /***********************************************************************
65 TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
66 if (!(hDOSEnvironment = TASK_CreateDOSEnvironment()))
67 fprintf( stderr, "Not enough memory for DOS Environment\n" );
68 return (hDOSEnvironment != 0);
72 /***********************************************************************
75 HTASK TASK_GetNextTask( HTASK hTask )
77 TDB* pTask = (TDB*)GlobalLock16(hTask);
79 if (pTask->hNext) return pTask->hNext;
80 return (hFirstTask != hTask) ? hFirstTask : 0;
84 /***********************************************************************
85 * TASK_CreateDOSEnvironment
87 * Create the original DOS environment.
89 static HANDLE TASK_CreateDOSEnvironment(void)
91 static const char program_name[] = "KRNL386.EXE";
93 int initial_size, size, i, winpathlen, sysdirlen;
96 extern char **environ;
98 /* DOS environment format:
106 * ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
109 /* First compute the size of the fixed part of the environment */
111 for (i = winpathlen = 0; ; i++)
113 int len = DIR_GetDosPath( i, NULL, 0 );
115 winpathlen += len + 1;
117 if (!winpathlen) winpathlen = 1;
118 sysdirlen = GetSystemDirectory( NULL, 0 ) + 1;
119 initial_size = 5 + winpathlen + /* PATH=xxxx */
120 1 + /* BYTE 0 at end */
121 sizeof(WORD) + /* WORD 1 */
122 sysdirlen + /* program directory */
123 strlen(program_name) + 1; /* program name */
125 /* Compute the total size of the Unix environment (except path) */
127 for (e = environ, size = initial_size; *e; e++)
129 if (lstrncmpi(*e, "path=", 5))
131 int len = strlen(*e) + 1;
132 if (size + len >= 32767)
134 fprintf( stderr, "Warning: environment larger than 32k.\n" );
142 /* Now allocate the environment */
144 if (!(handle = GlobalAlloc16( GMEM_FIXED, size ))) return 0;
145 p = (char *)GlobalLock16( handle );
147 /* And fill it with the Unix environment */
149 for (e = environ, size = initial_size; *e; e++)
151 if (lstrncmpi(*e, "path=", 5))
153 int len = strlen(*e) + 1;
154 if (size + len >= 32767) break;
161 /* Now add the path */
163 strcpy( p, "PATH=" );
164 for (i = 0, p += 5; ; i++)
166 if (!DIR_GetDosPath( i, p, winpathlen )) break;
170 if (p[-1] == ';') p[-1] = '\0';
173 /* Now add the program name */
178 GetSystemDirectory( p, sysdirlen );
180 strcat( p, program_name );
184 p = (char *) GlobalLock16( handle );
185 dprintf_task(stddeb, "Master DOS environment at %p\n", p);
186 for (; *p; p += strlen(p) + 1) dprintf_task(stddeb, " %s\n", p);
187 dprintf_task( stddeb, "Progname: %s\n", p+3 );
193 /***********************************************************************
196 static void TASK_LinkTask( HTASK hTask )
201 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
202 prevTask = &hFirstTask;
205 TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask );
206 if (prevTaskPtr->priority >= pTask->priority) break;
207 prevTask = &prevTaskPtr->hNext;
209 pTask->hNext = *prevTask;
215 /***********************************************************************
218 static void TASK_UnlinkTask( HTASK hTask )
223 prevTask = &hFirstTask;
224 while (*prevTask && (*prevTask != hTask))
226 pTask = (TDB *)GlobalLock16( *prevTask );
227 prevTask = &pTask->hNext;
231 pTask = (TDB *)GlobalLock16( *prevTask );
232 *prevTask = pTask->hNext;
239 /***********************************************************************
242 * Create a thunk free-list in segment 'handle', starting from offset 'offset'
243 * and containing 'count' entries.
245 static void TASK_CreateThunks( HGLOBAL handle, WORD offset, WORD count )
251 pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
253 pThunk->magic = THUNK_MAGIC;
254 pThunk->free = (int)&pThunk->thunks - (int)pThunk;
256 for (i = 0; i < count-1; i++)
258 free += 8; /* Offset of next thunk */
259 pThunk->thunks[4*i] = free;
261 pThunk->thunks[4*i] = 0; /* Last thunk */
265 /***********************************************************************
268 * Allocate a thunk for MakeProcInstance().
271 static SEGPTR TASK_AllocThunk( HTASK hTask )
277 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
278 sel = pTask->hCSAlias;
279 pThunk = &pTask->thunks;
280 base = (int)pThunk - (int)pTask;
281 while (!pThunk->free)
284 if (!sel) /* Allocate a new segment */
286 sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
287 pTask->hPDB, TRUE, FALSE, FALSE );
288 if (!sel) return (SEGPTR)0;
289 TASK_CreateThunks( sel, 0, MIN_THUNKS );
292 pThunk = (THUNKS *)GlobalLock16( sel );
295 base += pThunk->free;
296 pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
297 return PTR_SEG_OFF_TO_SEGPTR( sel, base );
302 /***********************************************************************
305 * Free a MakeProcInstance() thunk.
308 static BOOL TASK_FreeThunk( HTASK hTask, SEGPTR thunk )
314 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
315 sel = pTask->hCSAlias;
316 pThunk = &pTask->thunks;
317 base = (int)pThunk - (int)pTask;
318 while (sel && (sel != HIWORD(thunk)))
321 pThunk = (THUNKS *)GlobalLock16( sel );
324 if (!sel) return FALSE;
325 *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
326 pThunk->free = LOWORD(thunk) - base;
332 /***********************************************************************
335 * 32-bit entry point for a new task. This function is responsible for
336 * setting up the registers and jumping to the 16-bit entry point.
339 static void TASK_CallToStart(void)
341 int cs_reg, ds_reg, ip_reg;
342 TDB *pTask = (TDB *)GlobalLock16( hCurrentTask );
343 NE_MODULE *pModule = MODULE_GetPtr( pTask->hModule );
344 SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
346 /* Registers at initialization must be:
348 * bx stack size in bytes
349 * cx heap size in bytes
350 * si previous app instance
351 * di current app instance
353 * es selector to the PSP
354 * ds dgroup of the application
356 * sp top of the stack
359 cs_reg = pSegTable[pModule->cs - 1].selector;
360 ip_reg = pModule->ip;
361 ds_reg = pSegTable[pModule->dgroup - 1].selector;
363 IF1632_Saved16_ss = pTask->ss;
364 IF1632_Saved16_sp = pTask->sp;
365 dprintf_task( stddeb, "Starting main program: cs:ip=%04x:%04x ds=%04x ss:sp=%04x:%04x\n",
366 cs_reg, ip_reg, ds_reg,
367 IF1632_Saved16_ss, IF1632_Saved16_sp);
369 CallTo16_regs_( (FARPROC)(cs_reg << 16 | ip_reg), ds_reg,
370 pTask->hPDB /*es*/, 0 /*bp*/, 0 /*ax*/,
371 pModule->stack_size /*bx*/, pModule->heap_size /*cx*/,
372 0 /*dx*/, 0 /*si*/, ds_reg /*di*/ );
374 /* This should never return */
375 fprintf( stderr, "TASK_CallToStart: Main program returned!\n" );
376 TASK_KillCurrentTask( 1 );
381 /***********************************************************************
384 HTASK TASK_CreateTask( HMODULE hModule, HANDLE hInstance, HANDLE hPrevInstance,
385 HANDLE hEnvironment, char *cmdLine, WORD cmdShow )
391 SEGTABLEENTRY *pSegTable;
395 char *stack16Top, *stack32Top;
396 STACK16FRAME *frame16;
397 STACK32FRAME *frame32;
398 extern DWORD CALLTO16_RetAddr_word;
401 if (!(pModule = MODULE_GetPtr( hModule ))) return 0;
402 pSegTable = NE_SEG_TABLE( pModule );
404 /* Allocate the task structure */
406 hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
407 hModule, FALSE, FALSE, FALSE );
408 if (!hTask) return 0;
409 pTask = (TDB *)GlobalLock16( hTask );
411 /* Allocate the new environment block */
413 if (!(hParentEnv = hEnvironment))
415 TDB *pParent = (TDB *)GlobalLock16( hCurrentTask );
416 hParentEnv = pParent ? pParent->pdb.environment : hDOSEnvironment;
418 /* FIXME: do we really need to make a copy also when */
419 /* we don't use the parent environment? */
420 if (!(hEnvironment = GlobalAlloc16( GMEM_FIXED, GlobalSize16(hParentEnv))))
422 GlobalFree16( hTask );
425 memcpy( GlobalLock16( hEnvironment ), GlobalLock16( hParentEnv ),
426 GlobalSize16( hParentEnv ) );
428 /* Get current directory */
430 GetModuleFileName( hModule, filename, sizeof(filename) );
431 name = strrchr(filename, '\\');
432 if (name) *(name+1) = 0;
434 /* Fill the task structure */
436 pTask->nEvents = 1; /* So the task can be started */
437 pTask->hSelf = hTask;
439 pTask->version = pModule->expected_version;
440 pTask->hInstance = hInstance;
441 pTask->hPrevInstance = hPrevInstance;
442 pTask->hModule = hModule;
443 pTask->hParent = hCurrentTask;
445 pTask->curdrive = 'C' - 'A' + 0x80;
446 strcpy( pTask->curdir, "\\" );
448 pTask->curdrive = filename[0] - 'A' + 0x80;
449 strcpy( pTask->curdir, filename+2 );
451 pTask->magic = TDB_MAGIC;
452 pTask->nCmdShow = cmdShow;
454 /* Create the thunks block */
456 TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
458 /* Copy the module name */
460 name = MODULE_GetModuleName( hModule );
461 strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
463 /* Allocate a selector for the PDB */
465 pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
466 hModule, FALSE, FALSE, FALSE, NULL );
470 pTask->pdb.int20 = 0x20cd;
472 pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
473 *(DWORD *)&pTask->pdb.dispatcher[1] = MODULE_GetEntryPoint( GetModuleHandle("KERNEL"), 102 ); /* KERNEL.102 is DOS3Call() */
474 pTask->pdb.savedint22 = INT_GetHandler( 0x22 );
475 pTask->pdb.savedint23 = INT_GetHandler( 0x23 );
476 pTask->pdb.savedint24 = INT_GetHandler( 0x24 );
477 pTask->pdb.fileHandlesPtr = (SEGPTR)MAKELONG( 0x18,
478 GlobalHandleToSel(pTask->hPDB) );
480 pTask->pdb.fileHandlesPtr = pTask->pdb.fileHandles;
482 memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
483 pTask->pdb.environment = hEnvironment;
484 pTask->pdb.nbFiles = 20;
485 lstrcpyn( pTask->pdb.cmdLine + 1, cmdLine, 127 );
486 pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 );
488 /* Get the compatibility flags */
490 pTask->compat_flags = GetProfileInt( name, "Compatibility", 0 );
492 /* Allocate a code segment alias for the TDB */
494 pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
495 sizeof(TDB), pTask->hPDB, TRUE,
496 FALSE, FALSE, NULL );
498 /* Set the owner of the environment block */
500 FarSetOwner( pTask->pdb.environment, pTask->hPDB );
502 /* Default DTA overwrites command-line */
504 pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
505 (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
507 /* Allocate the 32-bit stack */
510 pTask->hStack32 = GLOBAL_Alloc( GMEM_FIXED, STACK32_SIZE, pTask->hPDB,
511 FALSE, FALSE, FALSE );
513 /* Create the 32-bit stack frame */
515 *(DWORD *)GlobalLock16(pTask->hStack32) = 0xDEADBEEF;
516 stack32Top = (char*)GlobalLock16(pTask->hStack32) + STACK32_SIZE;
517 frame32 = (STACK32FRAME *)stack32Top - 1;
518 frame32->saved_esp = (DWORD)stack32Top;
525 frame32->retaddr = (DWORD)TASK_CallToStart;
526 frame32->codeselector = WINE_CODE_SELECTOR;
527 pTask->esp = (DWORD)frame32;
529 /* Create the 16-bit stack frame */
531 pTask->ss = hInstance;
532 pTask->sp = ((pModule->sp != 0) ? pModule->sp :
533 pSegTable[pModule->ss-1].minsize + pModule->stack_size) & ~1;
534 stack16Top = (char *)PTR_SEG_OFF_TO_LIN( pTask->ss, pTask->sp );
535 frame16 = (STACK16FRAME *)stack16Top - 1;
536 frame16->saved_ss = 0; /*pTask->ss;*/
537 frame16->saved_sp = 0; /*pTask->sp;*/
538 frame16->ds = frame16->es = pTask->hInstance;
539 frame16->entry_point = 0;
540 frame16->entry_ip = OFFSETOF(TASK_RescheduleProc) + 14;
541 frame16->entry_cs = SELECTOROF(TASK_RescheduleProc);
543 frame16->ip = LOWORD( CALLTO16_RetAddr_word );
544 frame16->cs = HIWORD( CALLTO16_RetAddr_word );
545 pTask->sp -= sizeof(STACK16FRAME);
547 /* If there's no 16-bit stack yet, use a part of the new task stack */
548 /* This is only needed to have a stack to switch from on the first */
549 /* call to DirectedYield(). */
551 if (!IF1632_Saved16_ss)
553 IF1632_Saved16_ss = pTask->ss;
554 IF1632_Saved16_sp = pTask->sp;
557 /* Add a breakpoint at the start of the task */
561 DBG_ADDR addr = { pSegTable[pModule->cs-1].selector, pModule->ip };
562 fprintf( stderr, "Task '%s': ", name );
563 DEBUG_AddBreakpoint( &addr );
567 /* Add the task to the linked list */
569 TASK_LinkTask( hTask );
571 dprintf_task( stddeb, "CreateTask: module='%s' cmdline='%s' task=%04x\n",
572 name, cmdLine, hTask );
578 /***********************************************************************
581 static void TASK_DeleteTask( HTASK hTask )
586 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
589 /* Free the task module */
591 FreeModule( pTask->hModule );
593 /* Close all open files of this task */
595 FILE_CloseAllFiles( pTask->hPDB );
597 /* Free the selector aliases */
599 GLOBAL_FreeBlock( pTask->hCSAlias );
600 GLOBAL_FreeBlock( pTask->hPDB );
602 /* Free the task structure itself */
604 GlobalFree16( hTask );
606 /* Free all memory used by this task (including the 32-bit stack, */
607 /* the environment block and the thunk segments). */
609 GlobalFreeAll( hPDB );
613 /***********************************************************************
614 * TASK_KillCurrentTask
616 * Kill the currently running task. As it's not possible to kill the
617 * current task like this, it is simply marked for destruction, and will
618 * be killed when either TASK_Reschedule or this function is called again
619 * in the context of another task.
621 void TASK_KillCurrentTask( int exitCode )
623 extern void EXEC_ExitWindows( int retCode );
625 TDB* pTask = (TDB*) GlobalLock16( hCurrentTask );
627 /* Perform USER cleanup */
629 USER_AppExit( hCurrentTask, pTask->hInstance, pTask->hQueue );
631 if (hTaskToKill && (hTaskToKill != hCurrentTask))
633 /* If another task is already marked for destruction, */
634 /* we call kill it now, as we are in another context. */
635 TASK_DeleteTask( hTaskToKill );
640 dprintf_task( stddeb, "Killing the last task, exiting\n" );
641 EXEC_ExitWindows( 0 );
644 /* Remove the task from the list to be sure we never switch back to it */
645 TASK_UnlinkTask( hCurrentTask );
647 hTaskToKill = hCurrentTask;
651 /* We should never return from this Yield() */
653 fprintf(stderr,"It's alive! Alive!!!\n");
658 /***********************************************************************
661 * This is where all the magic of task-switching happens!
663 * This function should only be called via the TASK_SCHEDULE() macro, to make
664 * sure that all the context is saved correctly.
666 void TASK_Reschedule(void)
668 TDB *pOldTask = NULL, *pNewTask;
674 /* First check if there's a task to kill */
676 if (hTaskToKill && (hTaskToKill != hCurrentTask))
678 TASK_DeleteTask( hTaskToKill );
682 /* If current task is locked, simply return */
684 if (hLockedTask) return;
686 /* Find a task to yield to */
688 pOldTask = (TDB *)GlobalLock16( hCurrentTask );
689 if (pOldTask && pOldTask->hYieldTo)
691 /* If a task is stored in hYieldTo of the current task (put there */
692 /* by DirectedYield), yield to it only if it has events pending. */
693 hTask = pOldTask->hYieldTo;
694 if (!(pNewTask = (TDB *)GlobalLock16( hTask )) || !pNewTask->nEvents)
703 pNewTask = (TDB *)GlobalLock16( hTask );
704 if (pNewTask->nEvents && (hTask != hCurrentTask)) break;
705 hTask = pNewTask->hNext;
709 /* If there's a task to kill, switch to any other task, */
710 /* even if it doesn't have events pending. */
712 if (!hTask && hTaskToKill) hTask = hFirstTask;
714 if (!hTask) return; /* Do nothing */
716 pNewTask = (TDB *)GlobalLock16( hTask );
717 dprintf_task( stddeb, "Switching to task %04x (%.8s)\n",
718 hTask, pNewTask->module_name );
720 /* Save the stacks of the previous task (if any) */
722 #ifndef WINELIB /* FIXME: JBP: IF1632 not allowed in libwine.a */
725 pOldTask->ss = IF1632_Saved16_ss;
726 pOldTask->sp = IF1632_Saved16_sp;
727 pOldTask->esp = IF1632_Saved32_esp;
729 else IF1632_Original32_esp = IF1632_Saved32_esp;
732 /* Make the task the last in the linked list (round-robin scheduling) */
734 pNewTask->priority++;
735 TASK_UnlinkTask( hTask );
736 TASK_LinkTask( hTask );
737 pNewTask->priority--;
739 /* Switch to the new stack */
741 hCurrentTask = hTask;
742 #ifndef WINELIB /* FIXME: JBP: IF1632 not allowed in libwine.a */
743 IF1632_Saved16_ss = pNewTask->ss;
744 IF1632_Saved16_sp = pNewTask->sp;
745 IF1632_Saved32_esp = pNewTask->esp;
746 IF1632_Stack32_base = WIN16_GlobalLock16( pNewTask->hStack32 );
751 /***********************************************************************
752 * InitTask (KERNEL.91)
757 void InitTask( struct sigcontext_struct context )
760 static int firstTask = 1;
763 SEGTABLEENTRY *pSegTable;
764 INSTANCEDATA *pinstance;
765 LONG stacklow, stackhi;
768 EAX_reg(&context) = 0;
770 if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
771 if (!(pModule = MODULE_GetPtr( pTask->hModule ))) return;
775 extern BOOL WIDGETS_Init(void);
776 extern BOOL WIN_CreateDesktopWindow(void);
778 /* Perform global initialisations that need a task context */
780 /* Initialize built-in window classes */
781 if (!WIDGETS_Init()) return;
783 /* Create desktop window */
784 if (!WIN_CreateDesktopWindow()) return;
790 NE_InitializeDLLs( pTask->hModule );
792 /* Registers on return are:
793 * ax 1 if OK, 0 on error
794 * cx stack limit in bytes
795 * dx cmdShow parameter
796 * si instance handle of the previous instance
797 * di instance handle of the new task
798 * es:bx pointer to command-line inside PSP
800 EAX_reg(&context) = 1;
801 EBX_reg(&context) = 0x81;
802 ECX_reg(&context) = pModule->stack_size;
803 EDX_reg(&context) = pTask->nCmdShow;
804 ESI_reg(&context) = (DWORD)pTask->hPrevInstance;
805 EDI_reg(&context) = (DWORD)pTask->hInstance;
806 ES_reg (&context) = (WORD)pTask->hPDB;
808 /* Initialize the local heap */
809 if ( pModule->heap_size )
811 LocalInit( pTask->hInstance, 0, pModule->heap_size );
816 /* Initialize the INSTANCEDATA structure */
817 pSegTable = NE_SEG_TABLE( pModule );
818 stacklow = pSegTable[pModule->ss - 1].minsize;
819 stackhi = stacklow + pModule->stack_size;
820 if (stackhi > 0xffff) stackhi = 0xffff;
821 pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
822 pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
823 pinstance->stacktop = stacklow;
825 pinstance->stackmin = IF1632_Saved16_sp;
830 /***********************************************************************
831 * WaitEvent (KERNEL.30)
833 BOOL WaitEvent( HTASK hTask )
837 if (!hTask) hTask = hCurrentTask;
838 pTask = (TDB *)GlobalLock16( hTask );
839 if (pTask->nEvents > 0)
845 /* When we get back here, we have an event (or the task is the only one) */
846 if (pTask->nEvents > 0) pTask->nEvents--;
851 /***********************************************************************
852 * PostEvent (KERNEL.31)
854 void PostEvent( HTASK hTask )
858 if (!hTask) hTask = hCurrentTask;
859 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
864 /***********************************************************************
865 * SetPriority (KERNEL.32)
867 void SetPriority( HTASK hTask, int delta )
872 if (!hTask) hTask = hCurrentTask;
873 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
874 newpriority = pTask->priority + delta;
875 if (newpriority < -32) newpriority = -32;
876 else if (newpriority > 15) newpriority = 15;
878 pTask->priority = newpriority + 1;
879 TASK_UnlinkTask( hTask );
880 TASK_LinkTask( hTask );
885 /***********************************************************************
886 * LockCurrentTask (KERNEL.33)
888 HTASK LockCurrentTask( BOOL bLock )
890 if (bLock) hLockedTask = hCurrentTask;
891 else hLockedTask = 0;
896 /***********************************************************************
897 * IsTaskLocked (KERNEL.122)
899 HTASK IsTaskLocked(void)
905 /***********************************************************************
906 * OldYield (KERNEL.117)
912 pCurTask = (TDB *)GlobalLock16( hCurrentTask );
913 if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */
915 if (pCurTask) pCurTask->nEvents--;
919 /***********************************************************************
920 * DirectedYield (KERNEL.150)
922 void DirectedYield( HTASK hTask )
926 if ((pCurTask = (TDB *)GlobalLock16( hCurrentTask )) != NULL)
927 pCurTask->hYieldTo = hTask;
933 /***********************************************************************
942 /***********************************************************************
943 * MakeProcInstance (KERNEL.51)
945 FARPROC MakeProcInstance( FARPROC func, HANDLE hInstance )
948 return func; /* func can be called directly in Win32 */
953 thunkaddr = TASK_AllocThunk( hCurrentTask );
954 if (!thunkaddr) return (FARPROC)0;
955 thunk = PTR_SEG_TO_LIN( thunkaddr );
957 dprintf_task( stddeb, "MakeProcInstance(%08lx,%04x): got thunk %08lx\n",
958 (DWORD)func, hInstance, (DWORD)thunkaddr );
960 *thunk++ = 0xb8; /* movw instance, %ax */
961 *thunk++ = (BYTE)(hInstance & 0xff);
962 *thunk++ = (BYTE)(hInstance >> 8);
963 *thunk++ = 0xea; /* ljmp func */
964 *(DWORD *)thunk = (DWORD)func;
965 return (FARPROC)thunkaddr;
970 /***********************************************************************
971 * FreeProcInstance (KERNEL.52)
973 void FreeProcInstance( FARPROC func )
976 dprintf_task( stddeb, "FreeProcInstance(%08lx)\n", (DWORD)func );
977 TASK_FreeThunk( hCurrentTask, (SEGPTR)func );
982 /**********************************************************************
983 * GetCodeHandle (KERNEL.93)
985 HANDLE GetCodeHandle( FARPROC proc )
989 BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
991 /* Return the code segment containing 'proc'. */
992 /* Not sure if this is really correct (shouldn't matter that much). */
994 /* Check if it is really a thunk */
995 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
996 handle = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
998 handle = GlobalHandle16( HIWORD(proc) );
1002 return (HANDLE)proc;
1007 /***********************************************************************
1008 * SetTaskQueue (KERNEL.34)
1010 HQUEUE SetTaskQueue( HANDLE hTask, HQUEUE hQueue )
1015 if (!hTask) hTask = hCurrentTask;
1016 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1018 hPrev = pTask->hQueue;
1019 pTask->hQueue = hQueue;
1021 TIMER_SwitchQueue( hPrev, hQueue );
1027 /***********************************************************************
1028 * GetTaskQueue (KERNEL.35)
1030 HQUEUE GetTaskQueue( HANDLE hTask )
1034 if (!hTask) hTask = hCurrentTask;
1035 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1036 return pTask->hQueue;
1040 /***********************************************************************
1041 * GetTaskQueueDS (KERNEL.118)
1044 void GetTaskQueueDS( struct sigcontext_struct context )
1046 DS_reg(&context) = GlobalHandleToSel( GetTaskQueue(0) );
1048 #endif /* WINELIB */
1051 /***********************************************************************
1052 * GetTaskQueueES (KERNEL.119)
1055 void GetTaskQueueES( struct sigcontext_struct context )
1057 ES_reg(&context) = GlobalHandleToSel( GetTaskQueue(0) );
1059 #endif /* WINELIB */
1062 /***********************************************************************
1063 * GetCurrentTask (KERNEL.36)
1065 HTASK GetCurrentTask(void)
1067 return hCurrentTask;
1070 DWORD WIN16_GetCurrentTask(void)
1072 /* This is the version used by relay code; the first task is */
1073 /* returned in the high word of the result */
1074 return MAKELONG( hCurrentTask, hFirstTask );
1078 /***********************************************************************
1079 * GetCurrentPDB (KERNEL.37)
1081 HANDLE GetCurrentPDB(void)
1085 if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1090 /***********************************************************************
1091 * GetInstanceData (KERNEL.54)
1093 int GetInstanceData( HANDLE instance, WORD buffer, int len )
1095 char *ptr = (char *)GlobalLock16( instance );
1096 if (!ptr || !len) return 0;
1097 if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1098 memcpy( ptr + buffer, (char *)GlobalLock16( CURRENT_DS ) + buffer, len );
1103 /***********************************************************************
1104 * SetErrorMode (KERNEL.107)
1106 UINT SetErrorMode( UINT mode )
1111 if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1112 oldMode = pTask->error_mode;
1113 pTask->error_mode = mode;
1118 /***********************************************************************
1119 * GetDOSEnvironment (KERNEL.131)
1121 SEGPTR GetDOSEnvironment(void)
1125 if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1126 return (SEGPTR)WIN16_GlobalLock16( pTask->pdb.environment );
1130 /***********************************************************************
1131 * GetNumTasks (KERNEL.152)
1133 WORD GetNumTasks(void)
1139 /***********************************************************************
1140 * GetTaskDS (KERNEL.155)
1142 HINSTANCE GetTaskDS(void)
1146 if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1147 return pTask->hInstance;
1151 /***********************************************************************
1152 * IsTask (KERNEL.320)
1154 BOOL IsTask( HTASK hTask )
1158 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1159 if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1160 return (pTask->magic == TDB_MAGIC);
1164 /***********************************************************************
1165 * GetExePtr (KERNEL.133)
1167 HMODULE GetExePtr( HANDLE handle )
1173 /* Check for module handle */
1175 if (!(ptr = GlobalLock16( handle ))) return 0;
1176 if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return handle;
1178 /* Check the owner for module handle */
1181 owner = FarGetOwner( handle );
1185 if (!(ptr = GlobalLock16( owner ))) return 0;
1186 if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return owner;
1188 /* Search for this handle and its owner inside all tasks */
1193 TDB *pTask = (TDB *)GlobalLock16( hTask );
1194 if ((hTask == handle) ||
1195 (pTask->hInstance == handle) ||
1196 (pTask->hQueue == handle) ||
1197 (pTask->hPDB == handle)) return pTask->hModule;
1198 if ((hTask == owner) ||
1199 (pTask->hInstance == owner) ||
1200 (pTask->hQueue == owner) ||
1201 (pTask->hPDB == owner)) return pTask->hModule;
1202 hTask = pTask->hNext;
1208 /***********************************************************************
1209 * TaskFirst (TOOLHELP.63)
1211 BOOL TaskFirst( TASKENTRY *lpte )
1213 lpte->hNext = hFirstTask;
1214 return TaskNext( lpte );
1218 /***********************************************************************
1219 * TaskNext (TOOLHELP.64)
1221 BOOL TaskNext( TASKENTRY *lpte )
1224 INSTANCEDATA *pInstData;
1226 dprintf_toolhelp( stddeb, "TaskNext(%p): task=%04x\n", lpte, lpte->hNext );
1227 if (!lpte->hNext) return FALSE;
1228 pTask = (TDB *)GlobalLock16( lpte->hNext );
1229 if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1230 pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
1231 lpte->hTask = lpte->hNext;
1232 lpte->hTaskParent = pTask->hParent;
1233 lpte->hInst = pTask->hInstance;
1234 lpte->hModule = pTask->hModule;
1235 lpte->wSS = pTask->ss;
1236 lpte->wSP = pTask->sp;
1237 lpte->wStackTop = pInstData->stacktop;
1238 lpte->wStackMinimum = pInstData->stackmin;
1239 lpte->wStackBottom = pInstData->stackbottom;
1240 lpte->wcEvents = pTask->nEvents;
1241 lpte->hQueue = pTask->hQueue;
1242 strncpy( lpte->szModule, pTask->module_name, 8 );
1243 lpte->szModule[8] = '\0';
1244 lpte->wPSPOffset = 0x100; /*??*/
1245 lpte->hNext = pTask->hNext;
1250 /***********************************************************************
1251 * TaskFindHandle (TOOLHELP.65)
1253 BOOL TaskFindHandle( TASKENTRY *lpte, HTASK hTask )
1255 lpte->hNext = hTask;
1256 return TaskNext( lpte );