/* * Task functions * * Copyright 1995 Alexandre Julliard */ #include #include #include #include "windows.h" #include "task.h" #include "callback.h" #include "dos_fs.h" #include "debugger.h" #include "global.h" #include "instance.h" #include "message.h" #include "miscemu.h" #include "module.h" #include "neexe.h" #include "options.h" #include "selectors.h" #include "toolhelp.h" #include "stddebug.h" #include "debug.h" #include "dde_proc.h" /* Min. number of thunks allocated when creating a new segment */ #define MIN_THUNKS 32 /* 32-bit stack size for each task */ /* Must not be greater than 64k, or MAKE_SEGPTR won't work */ #define STACK32_SIZE 0x10000 /* ------ Internal variables ------ */ static HTASK hFirstTask = 0; static HTASK hCurrentTask = 0; static HTASK hTaskToKill = 0; static HTASK hLockedTask = 0; static WORD nTaskCount = 0; static HANDLE hDOSEnvironment = 0; /* ------ Internal declarations ------ */ /* TASK_Reschedule() 16-bit entry point */ static FARPROC TASK_RescheduleProc; #ifdef WINELIB #define TASK_SCHEDULE() TASK_Reschedule(); #else #define TASK_SCHEDULE() CallTo16_word_(TASK_RescheduleProc,0) #endif static HANDLE TASK_CreateDOSEnvironment(void); /*********************************************************************** * TASK_Init */ BOOL TASK_Init(void) { TASK_RescheduleProc = (FARPROC)GetWndProcEntry16( "TASK_Reschedule" ); if (!(hDOSEnvironment = TASK_CreateDOSEnvironment())) fprintf( stderr, "Not enough memory for DOS Environment\n" ); return (hDOSEnvironment != 0); } /*********************************************************************** * TASK_CreateDOSEnvironment * * Create the original DOS environment. */ static HANDLE TASK_CreateDOSEnvironment(void) { static const char program_name[] = "KRNL386.EXE"; char **e, *p; int initial_size, size; HANDLE handle; extern char **environ; extern char WindowsDirectory[], SystemDirectory[]; /* DOS environment format: * ASCIIZ string 1 * ASCIIZ string 2 * ... * ASCIIZ string n * ASCIIZ PATH=xxx * ASCIIZ windir=xxx * BYTE 0 * WORD 1 * ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE) */ /* First compute the size of the fixed part of the environment */ initial_size = 5 + /* PATH= */ strlen(WindowsPath) + 1 + /* path value */ 7 + /* windir= */ strlen(WindowsDirectory) + 1 + /* windir value */ 1 + /* BYTE 0 at end */ sizeof(WORD) + /* WORD 1 */ strlen(SystemDirectory) + 1 + /* program directory */ strlen(program_name) + 1; /* program name */ /* Compute the total size of the Unix environment (except path) */ for (e = environ, size = initial_size; *e; e++) { if (strncasecmp(*e, "path=", 5)) { int len = strlen(*e) + 1; if (size + len >= 32767) { fprintf( stderr, "Warning: environment larger than 32k.\n" ); break; } size += len; } } /* Now allocate the environment */ if (!(handle = GlobalAlloc( GMEM_FIXED, size ))) return 0; p = (char *)GlobalLock( handle ); /* And fill it with the Unix environment */ for (e = environ, size = initial_size; *e; e++) { if (strncasecmp(*e, "path=", 5)) { int len = strlen(*e) + 1; if (size + len >= 32767) break; strcpy( p, *e ); size += len; p += len; } } /* Now add the path and Windows directory */ strcpy( p, "PATH=" ); strcat( p, WindowsPath ); p += strlen(p) + 1; strcpy( p, "windir=" ); strcat( p, WindowsDirectory ); p += strlen(p) + 1; /* Now add the program name */ *p++ = '\0'; *(WORD *)p = 1; p += sizeof(WORD); strcpy( p, SystemDirectory ); strcat( p, "\\" ); strcat( p, program_name ); /* Display it */ p = (char *) GlobalLock( handle ); dprintf_task(stddeb, "Master DOS environment at %p\n", p); for (; *p; p += strlen(p) + 1) dprintf_task(stddeb, " %s\n", p); dprintf_task( stddeb, "Progname: %s\n", p+3 ); return handle; } /*********************************************************************** * TASK_LinkTask */ static void TASK_LinkTask( HTASK hTask ) { HTASK *prevTask; TDB *pTask; if (!(pTask = (TDB *)GlobalLock( hTask ))) return; prevTask = &hFirstTask; while (*prevTask) { TDB *prevTaskPtr = (TDB *)GlobalLock( *prevTask ); if (prevTaskPtr->priority >= pTask->priority) break; prevTask = &prevTaskPtr->hNext; } pTask->hNext = *prevTask; *prevTask = hTask; nTaskCount++; } /*********************************************************************** * TASK_UnlinkTask */ static void TASK_UnlinkTask( HTASK hTask ) { HTASK *prevTask; TDB *pTask; prevTask = &hFirstTask; while (*prevTask && (*prevTask != hTask)) { pTask = (TDB *)GlobalLock( *prevTask ); prevTask = &pTask->hNext; } if (*prevTask) { pTask = (TDB *)GlobalLock( *prevTask ); *prevTask = pTask->hNext; pTask->hNext = 0; nTaskCount--; } } /*********************************************************************** * TASK_CreateThunks * * Create a thunk free-list in segment 'handle', starting from offset 'offset' * and containing 'count' entries. */ static void TASK_CreateThunks( HGLOBAL handle, WORD offset, WORD count ) { int i; WORD free; THUNKS *pThunk; pThunk = (THUNKS *)((BYTE *)GlobalLock( handle ) + offset); pThunk->next = 0; pThunk->magic = THUNK_MAGIC; pThunk->free = (int)&pThunk->thunks - (int)pThunk; free = pThunk->free; for (i = 0; i < count-1; i++) { free += 8; /* Offset of next thunk */ pThunk->thunks[4*i] = free; } pThunk->thunks[4*i] = 0; /* Last thunk */ } /*********************************************************************** * TASK_AllocThunk * * Allocate a thunk for MakeProcInstance(). */ static SEGPTR TASK_AllocThunk( HTASK hTask ) { TDB *pTask; THUNKS *pThunk; WORD sel, base; if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; sel = pTask->hCSAlias; pThunk = &pTask->thunks; base = (int)pThunk - (int)pTask; while (!pThunk->free) { sel = pThunk->next; if (!sel) /* Allocate a new segment */ { sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8, pTask->hPDB, TRUE, FALSE, FALSE ); if (!sel) return (SEGPTR)0; TASK_CreateThunks( sel, 0, MIN_THUNKS ); pThunk->next = sel; } pThunk = (THUNKS *)GlobalLock( sel ); base = 0; } base += pThunk->free; pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free); return MAKELONG( base, sel ); } /*********************************************************************** * TASK_FreeThunk * * Free a MakeProcInstance() thunk. */ static BOOL TASK_FreeThunk( HTASK hTask, SEGPTR thunk ) { TDB *pTask; THUNKS *pThunk; WORD sel, base; if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; sel = pTask->hCSAlias; pThunk = &pTask->thunks; base = (int)pThunk - (int)pTask; while (sel && (sel != HIWORD(thunk))) { sel = pThunk->next; pThunk = (THUNKS *)GlobalLock( sel ); base = 0; } if (!sel) return FALSE; *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free; pThunk->free = LOWORD(thunk) - base; return TRUE; } /*********************************************************************** * TASK_CallToStart * * 32-bit entry point for a new task. This function is responsible for * setting up the registers and jumping to the 16-bit entry point. */ static void TASK_CallToStart(void) { int cs_reg, ds_reg, ip_reg; TDB *pTask = (TDB *)GlobalLock( hCurrentTask ); NE_MODULE *pModule = (NE_MODULE *)GlobalLock( pTask->hModule ); SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule ); /* Registers at initialization must be: * ax zero * bx stack size in bytes * cx heap size in bytes * si previous app instance * di current app instance * bp zero * es selector to the PSP * ds dgroup of the application * ss stack selector * sp top of the stack */ cs_reg = pSegTable[pModule->cs - 1].selector; ip_reg = pModule->ip; ds_reg = pSegTable[pModule->dgroup - 1].selector; #ifndef WINELIB /* JBP: I doubt a CallTo16_regs_ is possible in libwine.a, and IF1632 is not * allowed. */ IF1632_Saved16_ss = pTask->ss; IF1632_Saved16_sp = pTask->sp; dprintf_task( stddeb, "Starting main program: cs:ip=%04x:%04x ds=%04x ss:sp=%04x:%04x\n", cs_reg, ip_reg, ds_reg, IF1632_Saved16_ss, IF1632_Saved16_sp); CallTo16_regs_( (FARPROC)(cs_reg << 16 | ip_reg), ds_reg, pTask->hPDB /*es*/, 0 /*bp*/, 0 /*ax*/, pModule->stack_size /*bx*/, pModule->heap_size /*cx*/, 0 /*dx*/, 0 /*si*/, ds_reg /*di*/ ); #else fprintf(stderr, "JBP: Ignoring main program: cs:ip=%04x:%04x ds=%04x ss:sp=%04x:%04x\n", cs_reg, ip_reg, ds_reg, pTask->ss, pTask->sp); #endif /* This should never return */ fprintf( stderr, "TASK_CallToStart: Main program returned!\n" ); TASK_KillCurrentTask( 1 ); } /*********************************************************************** * TASK_CreateTask */ HTASK TASK_CreateTask( HMODULE hModule, HANDLE hInstance, HANDLE hPrevInstance, HANDLE hEnvironment, char *cmdLine, WORD cmdShow ) { HTASK hTask; TDB *pTask; HANDLE hParentEnv; NE_MODULE *pModule; SEGTABLEENTRY *pSegTable; LPSTR name; char filename[256]; #ifndef WINELIB32 char *stack16Top, *stack32Top; STACK16FRAME *frame16; STACK32FRAME *frame32; extern DWORD CALL16_RetAddr_word; #endif if (!(pModule = (NE_MODULE *)GlobalLock( hModule ))) return 0; pSegTable = NE_SEG_TABLE( pModule ); /* Allocate the task structure */ hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB), hModule, FALSE, FALSE, FALSE ); if (!hTask) return 0; pTask = (TDB *)GlobalLock( hTask ); /* Allocate the new environment block */ if (!(hParentEnv = hEnvironment)) { TDB *pParent = (TDB *)GlobalLock( hCurrentTask ); hParentEnv = pParent ? pParent->pdb.environment : hDOSEnvironment; } /* FIXME: do we really need to make a copy also when */ /* we don't use the parent environment? */ if (!(hEnvironment = GlobalAlloc( GMEM_FIXED, GlobalSize( hParentEnv ) ))) { GlobalFree( hTask ); return 0; } memcpy( GlobalLock( hEnvironment ), GlobalLock( hParentEnv ), GlobalSize( hParentEnv ) ); /* Get current directory */ GetModuleFileName( hModule, filename, sizeof(filename) ); name = strrchr(filename, '\\'); if (name) *(name+1) = 0; /* Fill the task structure */ pTask->nEvents = 1; /* So the task can be started */ pTask->hSelf = hTask; pTask->flags = 0; pTask->version = pModule->expected_version; pTask->hInstance = hInstance; pTask->hPrevInstance = hPrevInstance; pTask->hModule = hModule; pTask->hParent = hCurrentTask; #ifdef WINELIB pTask->curdrive = 'C' - 'A' + 0x80; #else pTask->curdrive = filename[0] - 'A' + 0x80; #endif pTask->magic = TDB_MAGIC; pTask->nCmdShow = cmdShow; strcpy( pTask->curdir, filename+2 ); /* Create the thunks block */ TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 ); /* Copy the module name */ name = MODULE_GetModuleName( hModule ); strncpy( pTask->module_name, name, sizeof(pTask->module_name) ); /* Fill the PDB */ pTask->pdb.int20 = 0x20cd; pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */ *(DWORD *)&pTask->pdb.dispatcher[1] = MODULE_GetEntryPoint( GetModuleHandle("KERNEL"), 102 ); /* KERNEL.102 is DOS3Call() */ #ifndef WINELIB pTask->pdb.savedint22 = INT_GetHandler( 0x22 ); pTask->pdb.savedint23 = INT_GetHandler( 0x23 ); pTask->pdb.savedint24 = INT_GetHandler( 0x24 ); #endif pTask->pdb.environment = hEnvironment; strncpy( pTask->pdb.cmdLine + 1, cmdLine, 126 ); pTask->pdb.cmdLine[127] = '\0'; pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 ); /* Get the compatibility flags */ pTask->compat_flags = GetProfileInt( name, "Compatibility", 0 ); /* Allocate a selector for the PDB */ pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB), hModule, FALSE, FALSE, FALSE, NULL ); /* Allocate a code segment alias for the TDB */ pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask, sizeof(TDB), pTask->hPDB, TRUE, FALSE, FALSE, NULL ); /* Set the owner of the environment block */ FarSetOwner( pTask->pdb.environment, pTask->hPDB ); /* Default DTA overwrites command-line */ pTask->dta = MAKELONG( (int)&pTask->pdb.cmdLine - (int)&pTask->pdb, pTask->hPDB ); /* Allocate the 32-bit stack */ #ifndef WINELIB pTask->hStack32 = GLOBAL_Alloc( GMEM_FIXED, STACK32_SIZE, pTask->hPDB, FALSE, FALSE, FALSE ); /* Create the 32-bit stack frame */ *(DWORD *)GlobalLock(pTask->hStack32) = 0xDEADBEEF; stack32Top = (char*)GlobalLock(pTask->hStack32) + STACK32_SIZE; frame32 = (STACK32FRAME *)stack32Top - 1; frame32->saved_esp = (DWORD)stack32Top; frame32->edi = 0; frame32->esi = 0; frame32->edx = 0; frame32->ecx = 0; frame32->ebx = 0; frame32->ebp = 0; frame32->retaddr = (DWORD)TASK_CallToStart; frame32->codeselector = WINE_CODE_SELECTOR; pTask->esp = (DWORD)frame32; /* Create the 16-bit stack frame */ pTask->ss = hInstance; pTask->sp = ((pModule->sp != 0) ? pModule->sp : pSegTable[pModule->ss-1].minsize + pModule->stack_size) & ~1; stack16Top = (char *)PTR_SEG_OFF_TO_LIN( pTask->ss, pTask->sp ); frame16 = (STACK16FRAME *)stack16Top - 1; frame16->saved_ss = 0; /*pTask->ss;*/ frame16->saved_sp = 0; /*pTask->sp;*/ frame16->ds = frame16->es = pTask->hInstance; frame16->entry_point = 0; frame16->ordinal_number = 24; /* WINPROCS.24 is TASK_Reschedule */ frame16->dll_id = 24; /* WINPROCS */ frame16->bp = 0; frame16->ip = LOWORD( CALL16_RetAddr_word ); frame16->cs = HIWORD( CALL16_RetAddr_word ); pTask->sp -= sizeof(STACK16FRAME); /* If there's no 16-bit stack yet, use a part of the new task stack */ /* This is only needed to have a stack to switch from on the first */ /* call to DirectedYield(). */ if (!IF1632_Saved16_ss) { IF1632_Saved16_ss = pTask->ss; IF1632_Saved16_sp = pTask->sp; } /* Add a breakpoint at the start of the task */ if (Options.debug) { DBG_ADDR addr = { pSegTable[pModule->cs-1].selector, pModule->ip }; fprintf( stderr, "Task '%s': ", name ); DEBUG_AddBreakpoint( &addr ); } #endif /* Add the task to the linked list */ TASK_LinkTask( hTask ); dprintf_task( stddeb, "CreateTask: module='%s' cmdline='%s' task="NPFMT"\n", name, cmdLine, hTask ); return hTask; } /*********************************************************************** * TASK_DeleteTask */ static void TASK_DeleteTask( HTASK hTask ) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock( hTask ))) return; /* Free the task module */ FreeModule( pTask->hModule ); /* Free all memory used by this task (including the 32-bit stack, */ /* the environment block and the thunk segments). */ GlobalFreeAll( pTask->hPDB ); /* Free message queue */ MSG_DeleteMsgQueue( pTask->hQueue ); /* Free the selector aliases */ GLOBAL_FreeBlock( pTask->hCSAlias ); GLOBAL_FreeBlock( pTask->hPDB ); /* Free the task structure itself */ GlobalFree( hTask ); } /*********************************************************************** * TASK_KillCurrentTask * * Kill the currently running task. As it's not possible to kill the * current task like this, it is simply marked for destruction, and will * be killed when either TASK_Reschedule or this function is called again * in the context of another task. */ void TASK_KillCurrentTask( int exitCode ) { if (hTaskToKill && (hTaskToKill != hCurrentTask)) { /* If another task is already marked for destruction, */ /* we call kill it now, as we are in another context. */ TASK_DeleteTask( hTaskToKill ); } if (nTaskCount <= 1) { dprintf_task( stddeb, "Killing the last task, exiting\n" ); exit(0); } /* Remove the task from the list to be sure we never switch back to it */ TASK_UnlinkTask( hCurrentTask ); hTaskToKill = hCurrentTask; hLockedTask = 0; Yield(); /* We should never return from this Yield() */ fprintf(stderr,"It's alive! Alive!!!\n"); exit(1); } /*********************************************************************** * TASK_Reschedule * * This is where all the magic of task-switching happens! * * This function should only be called via the TASK_SCHEDULE() macro, to make * sure that all the context is saved correctly. */ void TASK_Reschedule(void) { TDB *pOldTask = NULL, *pNewTask; HTASK hTask = 0; #ifdef CONFIG_IPC dde_reschedule(); #endif /* First check if there's a task to kill */ if (hTaskToKill && (hTaskToKill != hCurrentTask)) { TASK_DeleteTask( hTaskToKill ); hTaskToKill = 0; } /* If current task is locked, simply return */ if (hLockedTask) return; /* Find a task to yield to */ pOldTask = (TDB *)GlobalLock( hCurrentTask ); if (pOldTask && pOldTask->hYieldTo) { /* If a task is stored in hYieldTo of the current task (put there */ /* by DirectedYield), yield to it only if it has events pending. */ hTask = pOldTask->hYieldTo; if (!(pNewTask = (TDB *)GlobalLock( hTask )) || !pNewTask->nEvents) hTask = 0; } if (!hTask) { hTask = hFirstTask; while (hTask) { pNewTask = (TDB *)GlobalLock( hTask ); if (pNewTask->nEvents && (hTask != hCurrentTask)) break; hTask = pNewTask->hNext; } } /* If there's a task to kill, switch to any other task, */ /* even if it doesn't have events pending. */ if (!hTask && hTaskToKill) hTask = hFirstTask; if (!hTask) return; /* Do nothing */ pNewTask = (TDB *)GlobalLock( hTask ); dprintf_task( stddeb, "Switching to task "NPFMT" (%.8s)\n", hTask, pNewTask->module_name ); /* Save the stacks of the previous task (if any) */ #ifndef WINELIB /* FIXME: JBP: IF1632 not allowed in libwine.a */ if (pOldTask) { pOldTask->ss = IF1632_Saved16_ss; pOldTask->sp = IF1632_Saved16_sp; pOldTask->esp = IF1632_Saved32_esp; } else IF1632_Original32_esp = IF1632_Saved32_esp; #endif /* Make the task the last in the linked list (round-robin scheduling) */ pNewTask->priority++; TASK_UnlinkTask( hTask ); TASK_LinkTask( hTask ); pNewTask->priority--; /* Switch to the new stack */ hCurrentTask = hTask; #ifndef WINELIB /* FIXME: JBP: IF1632 not allowed in libwine.a */ IF1632_Saved16_ss = pNewTask->ss; IF1632_Saved16_sp = pNewTask->sp; IF1632_Saved32_esp = pNewTask->esp; IF1632_Stack32_base = WIN16_GlobalLock( pNewTask->hStack32 ); #endif } /*********************************************************************** * InitTask (KERNEL.91) */ void InitTask( struct sigcontext_struct context ) { static int firstTask = 1; TDB *pTask; NE_MODULE *pModule; SEGTABLEENTRY *pSegTable; INSTANCEDATA *pinstance; LONG stacklow, stackhi; EAX_reg(&context) = 0; if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return; if (!(pModule = (NE_MODULE *)GlobalLock( pTask->hModule ))) return; if (firstTask) { extern BOOL WIDGETS_Init(void); extern BOOL WIN_CreateDesktopWindow(void); /* Perform global initialisations that need a task context */ /* Initialize built-in window classes */ if (!WIDGETS_Init()) return; /* Create desktop window */ if (!WIN_CreateDesktopWindow()) return; firstTask = 0; } #ifndef WINELIB NE_InitializeDLLs( pTask->hModule ); #endif /* Registers on return are: * ax 1 if OK, 0 on error * cx stack limit in bytes * dx cmdShow parameter * si instance handle of the previous instance * di instance handle of the new task * es:bx pointer to command-line inside PSP */ EAX_reg(&context) = 1; EBX_reg(&context) = 0x81; ECX_reg(&context) = pModule->stack_size; EDX_reg(&context) = pTask->nCmdShow; ESI_reg(&context) = (DWORD)pTask->hPrevInstance; EDI_reg(&context) = (DWORD)pTask->hInstance; ES_reg (&context) = (WORD)pTask->hPDB; /* Initialize the local heap */ if ( pModule->heap_size ) { LocalInit( pTask->hInstance, 0, pModule->heap_size ); } /* Initialize the INSTANCEDATA structure */ pSegTable = NE_SEG_TABLE( pModule ); stacklow = pSegTable[pModule->ss - 1].minsize; stackhi = stacklow + pModule->stack_size; if (stackhi > 0xffff) stackhi = 0xffff; pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0); pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */ pinstance->stacktop = stacklow; #ifndef WINELIB /* FIXME: JBP: IF1632 not allowed in libwine.a */ pinstance->stackmin = IF1632_Saved16_sp; #endif } /*********************************************************************** * WaitEvent (KERNEL.30) */ BOOL WaitEvent( HTASK hTask ) { TDB *pTask; if (!hTask) hTask = hCurrentTask; pTask = (TDB *)GlobalLock( hTask ); if (pTask->nEvents > 0) { pTask->nEvents--; return FALSE; } TASK_SCHEDULE(); /* When we get back here, we have an event (or the task is the only one) */ if (pTask->nEvents > 0) pTask->nEvents--; return TRUE; } /*********************************************************************** * PostEvent (KERNEL.31) */ void PostEvent( HTASK hTask ) { TDB *pTask; if (!hTask) hTask = hCurrentTask; if (!(pTask = (TDB *)GlobalLock( hTask ))) return; pTask->nEvents++; } /*********************************************************************** * SetPriority (KERNEL.32) */ void SetPriority( HTASK hTask, int delta ) { TDB *pTask; int newpriority; if (!hTask) hTask = hCurrentTask; if (!(pTask = (TDB *)GlobalLock( hTask ))) return; newpriority = pTask->priority + delta; if (newpriority < -32) newpriority = -32; else if (newpriority > 15) newpriority = 15; pTask->priority = newpriority + 1; TASK_UnlinkTask( hTask ); TASK_LinkTask( hTask ); pTask->priority--; } /*********************************************************************** * LockCurrentTask (KERNEL.33) */ HTASK LockCurrentTask( BOOL bLock ) { if (bLock) hLockedTask = hCurrentTask; else hLockedTask = 0; return hLockedTask; } /*********************************************************************** * IsTaskLocked (KERNEL.122) */ WORD IsTaskLocked(void) { return hLockedTask; } /*********************************************************************** * OldYield (KERNEL.117) */ void OldYield(void) { TDB *pCurTask; pCurTask = (TDB *)GlobalLock( hCurrentTask ); if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */ TASK_SCHEDULE(); if (pCurTask) pCurTask->nEvents--; } /*********************************************************************** * DirectedYield (KERNEL.150) */ void DirectedYield( HTASK hTask ) { TDB *pCurTask; if ((pCurTask = (TDB *)GlobalLock( hCurrentTask )) != NULL) pCurTask->hYieldTo = hTask; OldYield(); } /*********************************************************************** * Yield (KERNEL.29) */ void Yield(void) { DirectedYield( 0 ); } /*********************************************************************** * MakeProcInstance (KERNEL.51) */ FARPROC MakeProcInstance( FARPROC func, HANDLE hInstance ) { BYTE *thunk; SEGPTR thunkaddr; thunkaddr = TASK_AllocThunk( hCurrentTask ); if (!thunkaddr) return (FARPROC)0; thunk = PTR_SEG_TO_LIN( thunkaddr ); dprintf_task( stddeb, "MakeProcInstance(%08lx,"NPFMT"): got thunk %08lx\n", (SEGPTR)func, hInstance, (SEGPTR)thunkaddr ); *thunk++ = 0xb8; /* movw instance, %ax */ #ifndef WINELIB *thunk++ = (BYTE)(hInstance & 0xff); *thunk++ = (BYTE)(hInstance >> 8); #endif *thunk++ = 0xea; /* ljmp func */ *(DWORD *)thunk = (DWORD)func; return (FARPROC)thunkaddr; } /*********************************************************************** * FreeProcInstance (KERNEL.52) */ void FreeProcInstance( FARPROC func ) { dprintf_task( stddeb, "FreeProcInstance(%08lx)\n", (SEGPTR)func ); TASK_FreeThunk( hCurrentTask, (SEGPTR)func ); } /********************************************************************** * GetCodeHandle (KERNEL.93) */ HANDLE GetCodeHandle( FARPROC proc ) { HANDLE handle; BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc ); /* Return the code segment containing 'proc'. */ /* Not sure if this is really correct (shouldn't matter that much). */ /* Check if it is really a thunk */ if ((thunk[0] == 0xb8) && (thunk[3] == 0xea)) handle = GlobalHandle( thunk[6] + (thunk[7] << 8) ); else handle = GlobalHandle( HIWORD(proc) ); printf( "STUB: GetCodeHandle(%08lx) returning "NPFMT"\n", (DWORD)proc, handle ); return handle; } /*********************************************************************** * SetTaskQueue (KERNEL.34) */ HGLOBAL SetTaskQueue( HANDLE hTask, HGLOBAL hQueue ) { HGLOBAL hPrev; TDB *pTask; if (!hTask) hTask = hCurrentTask; if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; hPrev = pTask->hQueue; pTask->hQueue = hQueue; return hPrev; } /*********************************************************************** * GetTaskQueue (KERNEL.35) */ HGLOBAL GetTaskQueue( HANDLE hTask ) { TDB *pTask; if (!hTask) hTask = hCurrentTask; if (!(pTask = (TDB *)GlobalLock( hTask ))) return 0; return pTask->hQueue; } /*********************************************************************** * GetTaskQueueDS (KERNEL.118) */ #ifndef WINELIB void GetTaskQueueDS( struct sigcontext_struct context ) { DS_reg(&context) = GlobalHandleToSel( GetTaskQueue(0) ); } #endif /* WINELIB */ /*********************************************************************** * GetTaskQueueES (KERNEL.119) */ #ifndef WINELIB void GetTaskQueueES( struct sigcontext_struct context ) { ES_reg(&context) = GlobalHandleToSel( GetTaskQueue(0) ); } #endif /* WINELIB */ /*********************************************************************** * GetCurrentTask (KERNEL.36) */ HTASK GetCurrentTask(void) { /* Undocumented: first task is returned in high word */ #ifdef WINELIB32 return hCurrentTask; #else return MAKELONG( hCurrentTask, hFirstTask ); #endif } /*********************************************************************** * GetCurrentPDB (KERNEL.37) */ HANDLE GetCurrentPDB(void) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0; return pTask->hPDB; } /*********************************************************************** * GetInstanceData (KERNEL.54) */ int GetInstanceData( HANDLE instance, WORD buffer, int len ) { char *ptr = (char *)GlobalLock( instance ); if (!ptr || !len) return 0; if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer; memcpy( ptr + buffer, (char *)GlobalLock( CURRENT_DS ) + buffer, len ); return len; } /*********************************************************************** * GetDOSEnvironment (KERNEL.131) */ SEGPTR GetDOSEnvironment(void) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0; return (SEGPTR)WIN16_GlobalLock( pTask->pdb.environment ); } /*********************************************************************** * GetNumTasks (KERNEL.152) */ WORD GetNumTasks(void) { return nTaskCount; } /*********************************************************************** * GetTaskDS (KERNEL.155) */ HINSTANCE GetTaskDS(void) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock( hCurrentTask ))) return 0; return pTask->hInstance; } /*********************************************************************** * IsTask (KERNEL.320) */ BOOL IsTask( HTASK hTask ) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock( hTask ))) return FALSE; if (GlobalSize( hTask ) < sizeof(TDB)) return FALSE; return (pTask->magic == TDB_MAGIC); } /*********************************************************************** * GetExePtr (KERNEL.133) */ HMODULE GetExePtr( HANDLE handle ) { char *ptr; HTASK hTask; HANDLE owner; /* Check for module handle */ if (!(ptr = GlobalLock( handle ))) return 0; if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return handle; /* Check the owner for module handle */ #ifndef WINELIB owner = FarGetOwner( handle ); #else owner = NULL; fprintf(stderr,"JBP: FarGetOwner() ignored.\n"); #endif if (!(ptr = GlobalLock( owner ))) return 0; if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return owner; /* Search for this handle and its owner inside all tasks */ hTask = hFirstTask; while (hTask) { TDB *pTask = (TDB *)GlobalLock( hTask ); if ((hTask == handle) || (pTask->hInstance == handle) || (pTask->hQueue == handle) || (pTask->hPDB == handle)) return pTask->hModule; if ((hTask == owner) || (pTask->hInstance == owner) || (pTask->hQueue == owner) || (pTask->hPDB == owner)) return pTask->hModule; hTask = pTask->hNext; } return 0; } /*********************************************************************** * TaskFirst (TOOLHELP.63) */ BOOL TaskFirst( TASKENTRY *lpte ) { lpte->hNext = hFirstTask; return TaskNext( lpte ); } /*********************************************************************** * TaskNext (TOOLHELP.64) */ BOOL TaskNext( TASKENTRY *lpte ) { TDB *pTask; INSTANCEDATA *pInstData; dprintf_toolhelp( stddeb, "TaskNext(%p): task="NPFMT"\n", lpte, lpte->hNext ); if (!lpte->hNext) return FALSE; pTask = (TDB *)GlobalLock( lpte->hNext ); if (!pTask || pTask->magic != TDB_MAGIC) return FALSE; pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 ); lpte->hTask = lpte->hNext; lpte->hTaskParent = pTask->hParent; lpte->hInst = pTask->hInstance; lpte->hModule = pTask->hModule; lpte->wSS = pTask->ss; lpte->wSP = pTask->sp; lpte->wStackTop = pInstData->stacktop; lpte->wStackMinimum = pInstData->stackmin; lpte->wStackBottom = pInstData->stackbottom; lpte->wcEvents = pTask->nEvents; lpte->hQueue = pTask->hQueue; strncpy( lpte->szModule, pTask->module_name, 8 ); lpte->szModule[8] = '\0'; lpte->wPSPOffset = 0x100; /*??*/ lpte->hNext = pTask->hNext; return TRUE; } /*********************************************************************** * TaskFindHandle (TOOLHELP.65) */ BOOL TaskFindHandle( TASKENTRY *lpte, HTASK hTask ) { lpte->hNext = hTask; return TaskNext( lpte ); }