/* * Task functions * * Copyright 1995 Alexandre Julliard */ #include #include #include #include #include "wine/winbase16.h" #include "user.h" #include "callback.h" #include "drive.h" #include "file.h" #include "global.h" #include "instance.h" #include "message.h" #include "miscemu.h" #include "module.h" #include "neexe.h" #include "peexe.h" #include "pe_image.h" #include "process.h" #include "queue.h" #include "selectors.h" #include "stackframe.h" #include "task.h" #include "thread.h" #include "toolhelp.h" #include "winnt.h" #include "winsock.h" #include "syslevel.h" #include "debugtools.h" #include "dosexe.h" #include "services.h" #include "server.h" DECLARE_DEBUG_CHANNEL(relay) DECLARE_DEBUG_CHANNEL(task) DECLARE_DEBUG_CHANNEL(toolhelp) /* Min. number of thunks allocated when creating a new segment */ #define MIN_THUNKS 32 /* Pointer to function to switch to a larger stack */ int (*IF1632_CallLargeStack)( int (*func)(), void *arg ) = NULL; static THHOOK DefaultThhook = { 0 }; THHOOK *pThhook = &DefaultThhook; #define hCurrentTask (pThhook->CurTDB) #define hFirstTask (pThhook->HeadTDB) #define hLockedTask (pThhook->LockTDB) static UINT16 nTaskCount = 0; /*********************************************************************** * TASK_InstallTHHook */ void TASK_InstallTHHook( THHOOK *pNewThhook ) { THHOOK *pOldThhook = pThhook; pThhook = pNewThhook? pNewThhook : &DefaultThhook; *pThhook = *pOldThhook; } /*********************************************************************** * TASK_GetNextTask */ HTASK16 TASK_GetNextTask( HTASK16 hTask ) { TDB* pTask = (TDB*)GlobalLock16(hTask); if (pTask->hNext) return pTask->hNext; return (hFirstTask != hTask) ? hFirstTask : 0; } /*********************************************************************** * TASK_LinkTask */ static void TASK_LinkTask( HTASK16 hTask ) { HTASK16 *prevTask; TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( hTask ))) return; prevTask = &hFirstTask; while (*prevTask) { TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask ); if (prevTaskPtr->priority >= pTask->priority) break; prevTask = &prevTaskPtr->hNext; } pTask->hNext = *prevTask; *prevTask = hTask; nTaskCount++; } /*********************************************************************** * TASK_UnlinkTask */ static void TASK_UnlinkTask( HTASK16 hTask ) { HTASK16 *prevTask; TDB *pTask; prevTask = &hFirstTask; while (*prevTask && (*prevTask != hTask)) { pTask = (TDB *)GlobalLock16( *prevTask ); prevTask = &pTask->hNext; } if (*prevTask) { pTask = (TDB *)GlobalLock16( *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( HGLOBAL16 handle, WORD offset, WORD count ) { int i; WORD free; THUNKS *pThunk; pThunk = (THUNKS *)((BYTE *)GlobalLock16( 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( HTASK16 hTask ) { TDB *pTask; THUNKS *pThunk; WORD sel, base; if (!(pTask = (TDB *)GlobalLock16( 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 *)GlobalLock16( sel ); base = 0; } base += pThunk->free; pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free); return PTR_SEG_OFF_TO_SEGPTR( sel, base ); } /*********************************************************************** * TASK_FreeThunk * * Free a MakeProcInstance() thunk. */ static BOOL TASK_FreeThunk( HTASK16 hTask, SEGPTR thunk ) { TDB *pTask; THUNKS *pThunk; WORD sel, base; if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0; sel = pTask->hCSAlias; pThunk = &pTask->thunks; base = (int)pThunk - (int)pTask; while (sel && (sel != HIWORD(thunk))) { sel = pThunk->next; pThunk = (THUNKS *)GlobalLock16( 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. */ void TASK_CallToStart(void) { TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() ); NE_MODULE *pModule = NE_GetPtr( pTask->hModule ); SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule ); CONTEXT86 context; /* Add task to 16-bit scheduler pool */ TASK_Reschedule(); /* 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 */ memset( &context, 0, sizeof(context) ); CS_reg(&context) = GlobalHandleToSel16(pSegTable[pModule->cs - 1].hSeg); DS_reg(&context) = GlobalHandleToSel16(pTask->hInstance); ES_reg(&context) = pTask->hPDB; EIP_reg(&context) = pModule->ip; EBX_reg(&context) = pModule->stack_size; ECX_reg(&context) = pModule->heap_size; EDI_reg(&context) = pTask->hInstance; ESI_reg(&context) = pTask->hPrevInstance; TRACE_(task)("Starting main program: cs:ip=%04lx:%04lx ds=%04lx ss:sp=%04x:%04x\n", CS_reg(&context), EIP_reg(&context), DS_reg(&context), SELECTOROF(pTask->teb->cur_stack), OFFSETOF(pTask->teb->cur_stack) ); Callbacks->CallRegisterShortProc( &context, 0 ); } /*********************************************************************** * TASK_Create * * NOTE: This routine might be called by a Win32 thread. Thus, we need * to be careful to protect global data structures. We do this * by entering the Win16Lock while linking the task into the * global task list. */ BOOL TASK_Create( NE_MODULE *pModule, UINT16 cmdShow) { HTASK16 hTask; TDB *pTask; LPSTR cmd_line; char name[10]; PDB *pdb32 = PROCESS_Current(); /* Allocate the task structure */ hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB), pModule->self, FALSE, FALSE, FALSE ); if (!hTask) return FALSE; pTask = (TDB *)GlobalLock16( hTask ); /* Fill the task structure */ pTask->nEvents = 0; pTask->hSelf = hTask; pTask->flags = 0; if (pModule->flags & NE_FFLAGS_WIN32) pTask->flags |= TDBF_WIN32; if (pModule->lpDosTask) pTask->flags |= TDBF_WINOLDAP; pTask->hInstance = pModule->self; pTask->hPrevInstance = 0; /* NOTE: for 16-bit tasks, the instance handles are updated later on in NE_InitProcess */ pTask->version = pModule->expected_version; pTask->hModule = pModule->self; pTask->hParent = GetCurrentTask(); pTask->magic = TDB_MAGIC; pTask->nCmdShow = cmdShow; pTask->teb = NtCurrentTeb(); pTask->curdrive = DRIVE_GetCurrentDrive() | 0x80; strcpy( pTask->curdir, "\\" ); lstrcpynA( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ), sizeof(pTask->curdir) - 1 ); /* Create the thunks block */ TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 ); /* Copy the module name */ GetModuleName16( pModule->self, name, sizeof(name) ); strncpy( pTask->module_name, name, sizeof(pTask->module_name) ); /* Allocate a selector for the PDB */ pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16), pModule->self, FALSE, FALSE, FALSE, NULL ); /* Fill the PDB */ pTask->pdb.int20 = 0x20cd; pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */ PUT_DWORD(&pTask->pdb.dispatcher[1], (DWORD)NE_GetEntryPoint( GetModuleHandle16("KERNEL"), 102 )); /* KERNEL.102 is DOS3Call() */ pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 ); pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 ); pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 ); pTask->pdb.fileHandlesPtr = PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles ); pTask->pdb.hFileHandles = 0; memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) ); pTask->pdb.environment = pdb32->env_db->env_sel; pTask->pdb.nbFiles = 20; /* Fill the command line */ cmd_line = pdb32->env_db->cmd_line; while (*cmd_line && (*cmd_line != ' ') && (*cmd_line != '\t')) cmd_line++; while ((*cmd_line == ' ') || (*cmd_line == '\t')) cmd_line++; lstrcpynA( pTask->pdb.cmdLine+1, cmd_line, sizeof(pTask->pdb.cmdLine)-1); pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 ); /* Get the compatibility flags */ pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 ); /* 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 */ FarSetOwner16( pTask->pdb.environment, pTask->hPDB ); /* Default DTA overwrites command-line */ pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb ); /* Create scheduler event for 16-bit tasks */ if ( !(pTask->flags & TDBF_WIN32) ) { pTask->hEvent = CreateEventA( NULL, TRUE, FALSE, NULL ); pTask->hEvent = ConvertToGlobalHandle( pTask->hEvent ); } /* Enter task handle into thread and process */ pTask->teb->htask16 = pTask->teb->process->task = hTask; TRACE_(task)("module='%s' cmdline='%s' task=%04x\n", name, cmd_line, hTask ); /* Add the task to the linked list */ SYSLEVEL_EnterWin16Lock(); TASK_LinkTask( hTask ); SYSLEVEL_LeaveWin16Lock(); return TRUE; } /*********************************************************************** * TASK_DeleteTask */ static void TASK_DeleteTask( HTASK16 hTask ) { TDB *pTask; HGLOBAL16 hPDB; if (!(pTask = (TDB *)GlobalLock16( hTask ))) return; hPDB = pTask->hPDB; pTask->magic = 0xdead; /* invalidate signature */ /* Delete the Win32 part of the task */ /* PROCESS_FreePDB( pTask->teb->process ); FIXME */ /* K32OBJ_DecCount( &pTask->teb->header ); FIXME */ /* Free the selector aliases */ GLOBAL_FreeBlock( pTask->hCSAlias ); GLOBAL_FreeBlock( pTask->hPDB ); /* Free the task module */ FreeModule16( pTask->hModule ); /* Free the task structure itself */ GlobalFree16( hTask ); /* Free all memory used by this task (including the 32-bit stack, */ /* the environment block and the thunk segments). */ GlobalFreeAll16( hPDB ); } /*********************************************************************** * TASK_KillTask */ void TASK_KillTask( HTASK16 hTask ) { TDB *pTask; /* Enter the Win16Lock to protect global data structures */ SYSLEVEL_EnterWin16Lock(); if ( !hTask ) hTask = GetCurrentTask(); pTask = (TDB *)GlobalLock16( hTask ); if ( !pTask ) { SYSLEVEL_LeaveWin16Lock(); return; } TRACE_(task)("Killing task %04x\n", hTask ); #ifdef MZ_SUPPORTED { /* Kill DOS VM task */ NE_MODULE *pModule = NE_GetPtr( pTask->hModule ); if ( pModule->lpDosTask ) MZ_KillModule( pModule->lpDosTask ); } #endif /* Perform USER cleanup */ TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask ); PROCESS_CallUserSignalProc( USIG_PROCESS_EXIT, 0, 0 ); PROCESS_CallUserSignalProc( USIG_THREAD_EXIT, GetCurrentThreadId(), 0 ); PROCESS_CallUserSignalProc( USIG_PROCESS_DESTROY, 0, 0 ); if (nTaskCount <= 1) { TRACE_(task)("this is the last task, exiting\n" ); ExitKernel16(); } /* FIXME: Hack! Send a message to the initial task so that * the GetMessage wakes up and the initial task can check whether * it is the only remaining one and terminate itself ... * The initial task should probably install hooks or something * to get informed about task termination :-/ */ Callout.PostAppMessage16( PROCESS_Initial()->task, WM_NULL, 0, 0 ); /* Remove the task from the list to be sure we never switch back to it */ TASK_UnlinkTask( hTask ); if( nTaskCount ) { TDB* p = (TDB *)GlobalLock16( hFirstTask ); while( p ) { if( p->hYieldTo == hTask ) p->hYieldTo = 0; p = (TDB *)GlobalLock16( p->hNext ); } } pTask->nEvents = 0; if ( hLockedTask == hTask ) hLockedTask = 0; TASK_DeleteTask( hTask ); /* When deleting the current task ... */ if ( hTask == hCurrentTask ) { DWORD lockCount; /* ... schedule another one ... */ TASK_Reschedule(); /* ... and completely release the Win16Lock, just in case. */ ReleaseThunkLock( &lockCount ); return; } SYSLEVEL_LeaveWin16Lock(); } /*********************************************************************** * TASK_Reschedule * * This is where all the magic of task-switching happens! * * 16-bit Windows performs non-preemptive (cooperative) multitasking. * This means that each 16-bit task runs until it voluntarily yields * control, at which point the scheduler gets active and selects the * next task to run. * * In Wine, all processes, even 16-bit ones, are scheduled preemptively * by the standard scheduler of the underlying OS. As many 16-bit apps * *rely* on the behaviour of the Windows scheduler, however, we have * to simulate that behaviour. * * This is achieved as follows: every 16-bit task is at time (except * during task creation and deletion) in one of two states: either it * is the one currently running, then the global variable hCurrentTask * contains its task handle, or it is not currently running, then it * is blocked on a special scheduler event, a global handle to which * is stored in the task struct. * * When the current task yields control, this routine gets called. Its * purpose is to determine the next task to be active, signal the * scheduler event of that task, and then put the current task to sleep * waiting for *its* scheduler event to get signalled again. * * This routine can get called in a few other special situations as well: * * - On creation of a 16-bit task, the Unix process executing the task * calls TASK_Reschedule once it has completed its initialization. * At this point, the task needs to be blocked until its scheduler * event is signalled the first time (this will be done by the parent * process to get the task up and running). * * - When the task currently running terminates itself, this routine gets * called and has to schedule another task, *without* blocking the * terminating task. * * - When a 32-bit thread posts an event for a 16-bit task, it might be * the case that *no* 16-bit task is currently running. In this case * the task that has now an event pending is to be scheduled. * */ void TASK_Reschedule(void) { TDB *pOldTask = NULL, *pNewTask = NULL; HTASK16 hOldTask = 0, hNewTask = 0; enum { MODE_YIELD, MODE_SLEEP, MODE_WAKEUP } mode; DWORD lockCount; SYSLEVEL_EnterWin16Lock(); /* Check what we need to do */ hOldTask = GetCurrentTask(); pOldTask = (TDB *)GlobalLock16( hOldTask ); TRACE_(task)( "entered with hCurrentTask %04x by hTask %04x (pid %ld)\n", hCurrentTask, hOldTask, (long) getpid() ); if ( pOldTask && THREAD_IsWin16( NtCurrentTeb() ) ) { /* We are called by an active (non-deleted) 16-bit task */ /* If we don't even have a current task, or else the current task has yielded, we'll need to schedule a new task and (possibly) put the calling task to sleep. Otherwise, we only block the caller. */ if ( !hCurrentTask || hCurrentTask == hOldTask ) mode = MODE_YIELD; else mode = MODE_SLEEP; } else { /* We are called by a deleted 16-bit task or a 32-bit thread */ /* The only situation where we need to do something is if we now do not have a current task. Then, we'll need to wake up some task that has events pending. */ if ( !hCurrentTask || hCurrentTask == hOldTask ) mode = MODE_WAKEUP; else { /* nothing to do */ SYSLEVEL_LeaveWin16Lock(); return; } } /* Find a task to yield to: check for DirectedYield() */ if ( mode == MODE_YIELD && pOldTask && pOldTask->hYieldTo ) { hNewTask = pOldTask->hYieldTo; pNewTask = (TDB *)GlobalLock16( hNewTask ); if( !pNewTask || !pNewTask->nEvents) hNewTask = 0; pOldTask->hYieldTo = 0; } /* Find a task to yield to: check for pending events */ if ( (mode == MODE_YIELD || mode == MODE_WAKEUP) && !hNewTask ) { hNewTask = hFirstTask; while (hNewTask) { pNewTask = (TDB *)GlobalLock16( hNewTask ); TRACE_(task)( "\ttask = %04x, events = %i\n", hNewTask, pNewTask->nEvents ); if (pNewTask->nEvents) break; hNewTask = pNewTask->hNext; } if (hLockedTask && (hNewTask != hLockedTask)) hNewTask = 0; } /* If we are still the task with highest priority, just return ... */ if ( mode == MODE_YIELD && hNewTask == hCurrentTask ) { TRACE_(task)("returning to the current task (%04x)\n", hCurrentTask ); SYSLEVEL_LeaveWin16Lock(); /* Allow Win32 threads to thunk down even while a Win16 task is in a tight PeekMessage() or Yield() loop ... */ ReleaseThunkLock( &lockCount ); RestoreThunkLock( lockCount ); return; } /* If no task to yield to found, suspend 16-bit scheduler ... */ if ( mode == MODE_YIELD && !hNewTask ) { TRACE_(task)("No currently active task\n"); hCurrentTask = 0; } /* If we found a task to wake up, do it ... */ if ( (mode == MODE_YIELD || mode == MODE_WAKEUP) && hNewTask ) { TRACE_(task)("Switching to task %04x (%.8s)\n", hNewTask, pNewTask->module_name ); pNewTask->priority++; TASK_UnlinkTask( hNewTask ); TASK_LinkTask( hNewTask ); pNewTask->priority--; hCurrentTask = hNewTask; SetEvent( pNewTask->hEvent ); /* This is set just in case some app reads it ... */ pNewTask->ss_sp = pNewTask->teb->cur_stack; } /* If we need to put the current task to sleep, do it ... */ if ( (mode == MODE_YIELD || mode == MODE_SLEEP) && hOldTask != hCurrentTask ) { ResetEvent( pOldTask->hEvent ); ReleaseThunkLock( &lockCount ); SYSLEVEL_CheckNotLevel( 1 ); WaitForSingleObject( pOldTask->hEvent, INFINITE ); RestoreThunkLock( lockCount ); } SYSLEVEL_LeaveWin16Lock(); } /*********************************************************************** * InitTask (KERNEL.91) * * Called by the application startup code. */ void WINAPI InitTask16( CONTEXT86 *context ) { TDB *pTask; INSTANCEDATA *pinstance; SEGPTR ptr; EAX_reg(context) = 0; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return; /* Note: we need to trust that BX/CX contain the stack/heap sizes, as some apps, notably Visual Basic apps, *modify* the heap/stack size of the instance data segment before calling InitTask() */ /* Initialize the INSTANCEDATA structure */ pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0); pinstance->stackmin = OFFSETOF( pTask->teb->cur_stack ); pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */ pinstance->stacktop = ( pinstance->stackmin > BX_reg(context)? pinstance->stackmin - BX_reg(context) : 0 ) + 150; /* Initialize the local heap */ if ( CX_reg(context) ) LocalInit16( pTask->hInstance, 0, CX_reg(context) ); /* Initialize implicitly loaded DLLs */ NE_InitializeDLLs( pTask->hModule ); NE_DllProcessAttach( pTask->hModule ); /* 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 * * 0 (=%bp) is pushed on the stack */ ptr = stack16_push( sizeof(WORD) ); *(WORD *)PTR_SEG_TO_LIN(ptr) = 0; ESP_reg(context) -= 2; EAX_reg(context) = 1; if (!pTask->pdb.cmdLine[0]) EBX_reg(context) = 0x80; else { LPBYTE p = &pTask->pdb.cmdLine[1]; while ((*p == ' ') || (*p == '\t')) p++; EBX_reg(context) = 0x80 + (p - pTask->pdb.cmdLine); } ECX_reg(context) = pinstance->stacktop; EDX_reg(context) = pTask->nCmdShow; ESI_reg(context) = (DWORD)pTask->hPrevInstance; EDI_reg(context) = (DWORD)pTask->hInstance; ES_reg (context) = (WORD)pTask->hPDB; } /*********************************************************************** * WaitEvent (KERNEL.30) */ BOOL16 WINAPI WaitEvent16( HTASK16 hTask ) { TDB *pTask; if (!hTask) hTask = GetCurrentTask(); pTask = (TDB *)GlobalLock16( hTask ); if ( !THREAD_IsWin16( NtCurrentTeb() ) ) { FIXME_(task)("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel); return TRUE; } if (pTask->nEvents > 0) { pTask->nEvents--; return FALSE; } TASK_Reschedule(); /* When we get back here, we have an event */ if (pTask->nEvents > 0) pTask->nEvents--; return TRUE; } /*********************************************************************** * PostEvent (KERNEL.31) */ void WINAPI PostEvent16( HTASK16 hTask ) { TDB *pTask; if (!hTask) hTask = GetCurrentTask(); if (!(pTask = (TDB *)GlobalLock16( hTask ))) return; if ( !THREAD_IsWin16( pTask->teb ) ) { FIXME_(task)("called for Win32 thread (%04x)!\n", pTask->teb->teb_sel ); return; } pTask->nEvents++; /* If we are a 32-bit task, we might need to wake up the 16-bit scheduler */ if ( !THREAD_IsWin16( NtCurrentTeb() ) ) TASK_Reschedule(); } /*********************************************************************** * SetPriority (KERNEL.32) */ void WINAPI SetPriority16( HTASK16 hTask, INT16 delta ) { TDB *pTask; INT16 newpriority; if (!hTask) hTask = GetCurrentTask(); if (!(pTask = (TDB *)GlobalLock16( 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) */ HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock ) { if (bLock) hLockedTask = GetCurrentTask(); else hLockedTask = 0; return hLockedTask; } /*********************************************************************** * IsTaskLocked (KERNEL.122) */ HTASK16 WINAPI IsTaskLocked16(void) { return hLockedTask; } /*********************************************************************** * OldYield (KERNEL.117) */ void WINAPI OldYield16(void) { TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() ); if ( !THREAD_IsWin16( NtCurrentTeb() ) ) { FIXME_(task)("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel); return; } if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */ TASK_Reschedule(); if (pCurTask) pCurTask->nEvents--; } /*********************************************************************** * WIN32_OldYield16 (KERNEL.447) */ void WINAPI WIN32_OldYield16(void) { DWORD count; ReleaseThunkLock(&count); RestoreThunkLock(count); } /*********************************************************************** * DirectedYield (KERNEL.150) */ void WINAPI DirectedYield16( HTASK16 hTask ) { TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() ); if ( !THREAD_IsWin16( NtCurrentTeb() ) ) { FIXME_(task)("called for Win32 thread (%04x)!\n", NtCurrentTeb()->teb_sel); return; } TRACE_(task)("%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask ); pCurTask->hYieldTo = hTask; OldYield16(); TRACE_(task)("%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask ); } /*********************************************************************** * Yield16 (KERNEL.29) */ void WINAPI Yield16(void) { TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() ); if (pCurTask) pCurTask->hYieldTo = 0; if (pCurTask && pCurTask->hQueue) Callout.UserYield16(); else OldYield16(); } /*********************************************************************** * KERNEL_490 (KERNEL.490) */ HTASK16 WINAPI KERNEL_490( HTASK16 someTask ) { if ( !someTask ) return 0; FIXME_(task)("(%04x): stub\n", someTask ); return 0; } /*********************************************************************** * MakeProcInstance16 (KERNEL.51) */ FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance ) { BYTE *thunk,*lfunc; SEGPTR thunkaddr; if (!func) { ERR_(task)("Ouch ! MakeProcInstance called with func == NULL !\n"); return (FARPROC16)0; /* Windows seems to do the same */ } if ( GetTaskDS16() !=hInstance ) { ERR_(task)("Problem with hInstance? Got %04x, using %04x instead\n", hInstance,GetTaskDS16()); hInstance = GetTaskDS16(); } if (!hInstance) hInstance = CURRENT_DS; thunkaddr = TASK_AllocThunk( GetCurrentTask() ); if (!thunkaddr) return (FARPROC16)0; thunk = PTR_SEG_TO_LIN( thunkaddr ); lfunc = PTR_SEG_TO_LIN( func ); TRACE_(task)("(%08lx,%04x): got thunk %08lx\n", (DWORD)func, hInstance, (DWORD)thunkaddr ); if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || ((lfunc[0]==0x1e) && (lfunc[1]==0x58)) ) { FIXME_(task)("thunk would be useless for %p, overwriting with nop;nop;\n", func ); lfunc[0]=0x90; /* nop */ lfunc[1]=0x90; /* nop */ } *thunk++ = 0xb8; /* movw instance, %ax */ *thunk++ = (BYTE)(hInstance & 0xff); *thunk++ = (BYTE)(hInstance >> 8); *thunk++ = 0xea; /* ljmp func */ *(DWORD *)thunk = (DWORD)func; return (FARPROC16)thunkaddr; } /*********************************************************************** * FreeProcInstance16 (KERNEL.52) */ void WINAPI FreeProcInstance16( FARPROC16 func ) { TRACE_(task)("(%08lx)\n", (DWORD)func ); TASK_FreeThunk( GetCurrentTask(), (SEGPTR)func ); } /********************************************************************** * TASK_GetCodeSegment * * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module * and logical segment number of a given code segment. * * 'proc' either *is* already a pair of module handle and segment number, * in which case there's nothing to do. Otherwise, it is a pointer to * a function, and we need to retrieve the code segment. If the pointer * happens to point to a thunk, we'll retrieve info about the code segment * where the function pointed to by the thunk resides, not the thunk itself. * * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about * the function the snoop code will return to ... * */ static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule, SEGTABLEENTRY **ppSeg, int *pSegNr ) { NE_MODULE *pModule = NULL; SEGTABLEENTRY *pSeg = NULL; int segNr; /* Try pair of module handle / segment number */ pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) ); if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE ) { segNr = LOWORD( proc ); if ( segNr && segNr <= pModule->seg_count ) pSeg = NE_SEG_TABLE( pModule ) + segNr-1; } /* Try thunk or function */ else { BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc ); WORD selector; if ((thunk[0] == 0xb8) && (thunk[3] == 0xea)) selector = thunk[6] + (thunk[7] << 8); else selector = HIWORD( proc ); pModule = NE_GetPtr( GlobalHandle16( selector ) ); pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL; if ( pModule ) for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ ) if ( GlobalHandleToSel16(pSeg->hSeg) == selector ) break; if ( pModule && segNr > pModule->seg_count ) pSeg = NULL; } /* Abort if segment not found */ if ( !pModule || !pSeg ) return FALSE; /* Return segment data */ if ( ppModule ) *ppModule = pModule; if ( ppSeg ) *ppSeg = pSeg; if ( pSegNr ) *pSegNr = segNr; return TRUE; } /********************************************************************** * GetCodeHandle (KERNEL.93) */ HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc ) { SEGTABLEENTRY *pSeg; if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) ) return (HANDLE16)0; return pSeg->hSeg; } /********************************************************************** * GetCodeInfo (KERNEL.104) */ BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo ) { NE_MODULE *pModule; SEGTABLEENTRY *pSeg; int segNr; if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) ) return FALSE; /* Fill in segment information */ segInfo->offSegment = pSeg->filepos; segInfo->cbSegment = pSeg->size; segInfo->flags = pSeg->flags; segInfo->cbAlloc = pSeg->minsize; segInfo->h = pSeg->hSeg; segInfo->alignShift = pModule->alignment; if ( segNr == pModule->dgroup ) segInfo->cbAlloc += pModule->heap_size + pModule->stack_size; /* Return module handle in %es */ CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self ); return TRUE; } /********************************************************************** * DefineHandleTable16 (KERNEL.94) */ BOOL16 WINAPI DefineHandleTable16( WORD wOffset ) { return TRUE; /* FIXME */ } /*********************************************************************** * SetTaskQueue (KERNEL.34) */ HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue ) { HQUEUE16 hPrev; TDB *pTask; if (!hTask) hTask = GetCurrentTask(); if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0; hPrev = pTask->hQueue; pTask->hQueue = hQueue; return hPrev; } /*********************************************************************** * GetTaskQueue (KERNEL.35) */ HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask ) { TDB *pTask; if (!hTask) hTask = GetCurrentTask(); if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0; return pTask->hQueue; } /*********************************************************************** * SetThreadQueue (KERNEL.463) */ HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue ) { TEB *teb = thread? THREAD_IdToTEB( thread ) : NtCurrentTeb(); HQUEUE16 oldQueue = teb? teb->queue : 0; if ( teb ) { teb->queue = hQueue; if ( GetTaskQueue16( teb->process->task ) == oldQueue ) SetTaskQueue16( teb->process->task, hQueue ); } return oldQueue; } /*********************************************************************** * GetThreadQueue (KERNEL.464) */ HQUEUE16 WINAPI GetThreadQueue16( DWORD thread ) { TEB *teb = NULL; if ( !thread ) teb = NtCurrentTeb(); else if ( HIWORD(thread) ) teb = THREAD_IdToTEB( thread ); else if ( IsTask16( (HTASK16)thread ) ) teb = ((TDB *)GlobalLock16( (HANDLE16)thread ))->teb; return (HQUEUE16)(teb? teb->queue : 0); } /*********************************************************************** * SetFastQueue (KERNEL.624) */ VOID WINAPI SetFastQueue16( DWORD thread, HANDLE hQueue ) { TEB *teb = NULL; if ( !thread ) teb = NtCurrentTeb(); else if ( HIWORD(thread) ) teb = THREAD_IdToTEB( thread ); else if ( IsTask16( (HTASK16)thread ) ) teb = ((TDB *)GlobalLock16( (HANDLE16)thread ))->teb; if ( teb ) teb->queue = (HQUEUE16) hQueue; } /*********************************************************************** * GetFastQueue (KERNEL.625) */ HANDLE WINAPI GetFastQueue16( void ) { TEB *teb = NtCurrentTeb(); if (!teb) return 0; if (!teb->queue) Callout.InitThreadInput16( 0, THREAD_IsWin16(teb)? 4 : 5 ); if (!teb->queue) FIXME_(task)("(): should initialize thread-local queue, expect failure!\n" ); return (HANDLE)teb->queue; } /*********************************************************************** * SwitchStackTo (KERNEL.108) */ void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top ) { TDB *pTask; STACK16FRAME *oldFrame, *newFrame; INSTANCEDATA *pData; UINT16 copySize; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return; if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return; TRACE_(task)("old=%04x:%04x new=%04x:%04x\n", SELECTOROF( pTask->teb->cur_stack ), OFFSETOF( pTask->teb->cur_stack ), seg, ptr ); /* Save the old stack */ oldFrame = THREAD_STACK16( pTask->teb ); /* pop frame + args and push bp */ pData->old_ss_sp = pTask->teb->cur_stack + sizeof(STACK16FRAME) + 2 * sizeof(WORD); *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp) = oldFrame->bp; pData->stacktop = top; pData->stackmin = ptr; pData->stackbottom = ptr; /* Switch to the new stack */ /* Note: we need to take the 3 arguments into account; otherwise, * the stack will underflow upon return from this function. */ copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp); copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME); pTask->teb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg, ptr - copySize ); newFrame = THREAD_STACK16( pTask->teb ); /* Copy the stack frame and the local variables to the new stack */ memmove( newFrame, oldFrame, copySize ); newFrame->bp = ptr; *(WORD *)PTR_SEG_OFF_TO_LIN( seg, ptr ) = 0; /* clear previous bp */ } /*********************************************************************** * SwitchStackBack (KERNEL.109) */ void WINAPI SwitchStackBack16( CONTEXT86 *context ) { STACK16FRAME *oldFrame, *newFrame; INSTANCEDATA *pData; if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack)))) return; if (!pData->old_ss_sp) { WARN_(task)("No previous SwitchStackTo\n" ); return; } TRACE_(task)("restoring stack %04x:%04x\n", SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) ); oldFrame = CURRENT_STACK16; /* Pop bp from the previous stack */ BP_reg(context) = *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp); pData->old_ss_sp += sizeof(WORD); /* Switch back to the old stack */ NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME); SS_reg(context) = SELECTOROF(pData->old_ss_sp); ESP_reg(context) = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/ pData->old_ss_sp = 0; /* Build a stack frame for the return */ newFrame = CURRENT_STACK16; newFrame->frame32 = oldFrame->frame32; newFrame->module_cs = oldFrame->module_cs; newFrame->callfrom_ip = oldFrame->callfrom_ip; newFrame->entry_ip = oldFrame->entry_ip; } /*********************************************************************** * GetTaskQueueDS16 (KERNEL.118) */ void WINAPI GetTaskQueueDS16(void) { CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) ); } /*********************************************************************** * GetTaskQueueES16 (KERNEL.119) */ void WINAPI GetTaskQueueES16(void) { CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) ); } /*********************************************************************** * GetCurrentTask (KERNEL.36) */ HTASK16 WINAPI GetCurrentTask(void) { return PROCESS_Current()->task; } DWORD WINAPI WIN16_GetCurrentTask(void) { /* This is the version used by relay code; the first task is */ /* returned in the high word of the result */ return MAKELONG( GetCurrentTask(), hFirstTask ); } /*********************************************************************** * GetCurrentPDB (KERNEL.37) * * UNDOC: returns PSP of KERNEL in high word */ DWORD WINAPI GetCurrentPDB16(void) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0; return MAKELONG(pTask->hPDB, 0); /* FIXME */ } /*********************************************************************** * GetCurPID16 (KERNEL.157) */ DWORD WINAPI GetCurPID16( DWORD unused ) { return 0; } /*********************************************************************** * GetInstanceData (KERNEL.54) */ INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len ) { char *ptr = (char *)GlobalLock16( instance ); if (!ptr || !len) return 0; if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer; memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len ); return len; } /*********************************************************************** * GetExeVersion (KERNEL.105) */ WORD WINAPI GetExeVersion16(void) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0; return pTask->version; } /*********************************************************************** * SetErrorMode16 (KERNEL.107) */ UINT16 WINAPI SetErrorMode16( UINT16 mode ) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0; pTask->error_mode = mode; return SetErrorMode( mode ); } /*********************************************************************** * GetDOSEnvironment (KERNEL.131) */ SEGPTR WINAPI GetDOSEnvironment16(void) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0; return PTR_SEG_OFF_TO_SEGPTR( pTask->pdb.environment, 0 ); } /*********************************************************************** * GetNumTasks (KERNEL.152) */ UINT16 WINAPI GetNumTasks16(void) { return nTaskCount; } /*********************************************************************** * GetTaskDS (KERNEL.155) * * Note: this function apparently returns a DWORD with LOWORD == HIWORD. * I don't think we need to bother with this. */ HINSTANCE16 WINAPI GetTaskDS16(void) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0; return pTask->hInstance; } /*********************************************************************** * GetDummyModuleHandleDS (KERNEL.602) */ WORD WINAPI GetDummyModuleHandleDS16(void) { TDB *pTask; WORD selector; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0; if (!(pTask->flags & TDBF_WIN32)) return 0; selector = GlobalHandleToSel16( pTask->hModule ); CURRENT_DS = selector; return selector; } /*********************************************************************** * IsTask (KERNEL.320) */ BOOL16 WINAPI IsTask16( HTASK16 hTask ) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE; if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE; return (pTask->magic == TDB_MAGIC); } /*********************************************************************** * IsWinOldApTask16 (KERNEL.158) */ BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask ) { /* should return bit 0 of byte 0x48 in PSP */ return FALSE; } /*********************************************************************** * SetTaskSignalProc (KERNEL.38) */ FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc ) { TDB *pTask; FARPROC16 oldProc; if (!hTask) hTask = GetCurrentTask(); if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL; oldProc = pTask->userhandler; pTask->userhandler = proc; return oldProc; } /*********************************************************************** * TASK_CallTaskSignalProc */ /* ### start build ### */ extern WORD CALLBACK TASK_CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD); /* ### stop build ### */ void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule ) { TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() ); if ( !pTask || !pTask->userhandler ) return; TASK_CallTo16_word_wwwww( pTask->userhandler, hTaskOrModule, uCode, 0, pTask->hInstance, pTask->hQueue ); } /*********************************************************************** * SetSigHandler (KERNEL.140) */ WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler, UINT16 *oldmode, UINT16 newmode, UINT16 flag ) { FIXME_(task)("(%p,%p,%p,%d,%d), unimplemented.\n", newhandler,oldhandler,oldmode,newmode,flag ); if (flag != 1) return 0; if (!newmode) newhandler = NULL; /* Default handler */ if (newmode != 4) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0; if (oldmode) *oldmode = pTask->signal_flags; pTask->signal_flags = newmode; if (oldhandler) *oldhandler = pTask->sighandler; pTask->sighandler = newhandler; } return 0; } /*********************************************************************** * GlobalNotify (KERNEL.154) * * Note that GlobalNotify does _not_ return the old NotifyProc * -- contrary to LocalNotify !! */ VOID WINAPI GlobalNotify16( FARPROC16 proc ) { TDB *pTask; if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return; pTask->discardhandler = proc; } /*********************************************************************** * GetExePtr (KERNEL.133) */ static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask ) { char *ptr; HANDLE16 owner; /* Check for module handle */ if (!(ptr = GlobalLock16( handle ))) return 0; if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle; /* Search for this handle inside all tasks */ *hTask = hFirstTask; while (*hTask) { TDB *pTask = (TDB *)GlobalLock16( *hTask ); if ((*hTask == handle) || (pTask->hInstance == handle) || (pTask->hQueue == handle) || (pTask->hPDB == handle)) return pTask->hModule; *hTask = pTask->hNext; } /* Check the owner for module handle */ owner = FarGetOwner16( handle ); if (!(ptr = GlobalLock16( owner ))) return 0; if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner; /* Search for the owner inside all tasks */ *hTask = hFirstTask; while (*hTask) { TDB *pTask = (TDB *)GlobalLock16( *hTask ); if ((*hTask == owner) || (pTask->hInstance == owner) || (pTask->hQueue == owner) || (pTask->hPDB == owner)) return pTask->hModule; *hTask = pTask->hNext; } return 0; } HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle ) { HTASK16 hTask = 0; HMODULE16 hModule = GetExePtrHelper( handle, &hTask ); STACK16FRAME *frame = CURRENT_STACK16; frame->ecx = hModule; if (hTask) frame->es = hTask; return hModule; } HMODULE16 WINAPI GetExePtr( HANDLE16 handle ) { HTASK16 hTask = 0; return GetExePtrHelper( handle, &hTask ); } /*********************************************************************** * TaskFirst (TOOLHELP.63) */ BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte ) { lpte->hNext = hFirstTask; return TaskNext16( lpte ); } /*********************************************************************** * TaskNext (TOOLHELP.64) */ BOOL16 WINAPI TaskNext16( TASKENTRY *lpte ) { TDB *pTask; INSTANCEDATA *pInstData; TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext ); if (!lpte->hNext) return FALSE; pTask = (TDB *)GlobalLock16( 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 = SELECTOROF( pTask->teb->cur_stack ); lpte->wSP = OFFSETOF( pTask->teb->cur_stack ); 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) */ BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask ) { lpte->hNext = hTask; return TaskNext16( lpte ); } /*********************************************************************** * GetAppCompatFlags16 (KERNEL.354) */ DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask ) { return GetAppCompatFlags( hTask ); } /*********************************************************************** * GetAppCompatFlags32 (USER32.206) */ DWORD WINAPI GetAppCompatFlags( HTASK hTask ) { TDB *pTask; if (!hTask) hTask = GetCurrentTask(); if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0; if (GlobalSize16(hTask) < sizeof(TDB)) return 0; return pTask->compat_flags; }