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Sweden-Number/loader/task.c

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/*
* Task functions
*
* Copyright 1995 Alexandre Julliard
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include "windows.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 "thread.h"
#include "syslevel.h"
#include "debug.h"
#include "dosexe.h"
#include "dde_proc.h"
#include "server.h"
/* 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;
/* Pointer to debugger callback routine */
void (*TASK_AddTaskEntryBreakpoint)( HTASK16 hTask ) = NULL;
static THHOOK DefaultThhook = { 0 };
THHOOK *pThhook = &DefaultThhook;
#define hCurrentTask (pThhook->CurTDB)
#define hFirstTask (pThhook->HeadTDB)
#define hLockedTask (pThhook->LockTDB)
static HTASK16 hTaskToKill = 0;
static UINT16 nTaskCount = 0;
static void TASK_YieldToSystem(TDB*);
extern BOOL32 THREAD_InitDone;
/***********************************************************************
* 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 BOOL32 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.
*/
static void TASK_CallToStart(void)
{
TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
SET_CUR_THREAD( pTask->thdb );
CLIENT_InitThread();
/* Terminate the stack frame chain */
memset(THREAD_STACK16( pTask->thdb ), '\0', sizeof(STACK16FRAME));
if (pModule->flags & NE_FFLAGS_WIN32)
{
/* FIXME: all this is an ugly hack */
LPTHREAD_START_ROUTINE entry = (LPTHREAD_START_ROUTINE)
RVA_PTR(pModule->module32, OptionalHeader.AddressOfEntryPoint);
if (PE_HEADER(pModule->module32)->OptionalHeader.Subsystem==IMAGE_SUBSYSTEM_WINDOWS_CUI)
AllocConsole();
if (pModule->heap_size)
LocalInit( pTask->hInstance, 0, pModule->heap_size );
InitApp( pTask->hModule );
MODULE_InitializeDLLs( PROCESS_Current(), 0, DLL_PROCESS_ATTACH, (LPVOID)-1 );
TRACE(relay, "(entryproc=%p)\n", entry );
#if 1
ExitProcess( entry(NULL) );
#else
{
DWORD size = PE_HEADER(pModule->module32)->OptionalHeader.SizeOfStackReserve;
DWORD id;
THDB *thdb;
CreateThread( NULL, size, entry, NULL, 0, &id );
thdb = THREAD_ID_TO_THDB( id );
while ( thdb->exit_code == 0x103 )
{
WaitEvent( 0 );
QUEUE_Signal( pTask->hSelf );
}
ExitProcess( thdb->exit_code );
}
#endif
}
else if (pModule->dos_image)
{
DOSVM_Enter( NULL );
ExitProcess( 0 );
}
else
{
/* 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
*/
CONTEXT context;
memset( &context, 0, sizeof(context) );
CS_reg(&context) = GlobalHandleToSel(pSegTable[pModule->cs - 1].hSeg);
DS_reg(&context) = GlobalHandleToSel(pSegTable[pModule->dgroup - 1].hSeg);
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) = context.SegDs;
TRACE(task, "Starting main program: cs:ip=%04lx:%04x ds=%04lx ss:sp=%04x:%04x\n",
CS_reg(&context), IP_reg(&context), DS_reg(&context),
SELECTOROF(pTask->thdb->cur_stack),
OFFSETOF(pTask->thdb->cur_stack) );
Callbacks->CallRegisterShortProc( &context, 0 );
/* This should never return */
ERR( task, "Main program returned! (should never happen)\n" );
ExitProcess( 1 );
}
}
/***********************************************************************
* TASK_Create
*
* NOTE: This routine might be called by a Win32 thread. We don't have
* any real problems with that, since we operated merely on a private
* TDB structure that is not yet linked into the task list.
*/
HTASK16 TASK_Create( THDB *thdb, NE_MODULE *pModule, HINSTANCE16 hInstance,
HINSTANCE16 hPrevInstance, UINT16 cmdShow)
{
HTASK16 hTask;
TDB *pTask, *pInitialTask;
LPSTR cmd_line;
WORD sp;
char *stack32Top;
char name[10];
STACK16FRAME *frame16;
STACK32FRAME *frame32;
PDB32 *pdb32 = thdb->process;
SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
/* Allocate the task structure */
hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
pModule->self, FALSE, FALSE, FALSE );
if (!hTask) return 0;
pTask = (TDB *)GlobalLock16( hTask );
/* Fill the task structure */
pTask->nEvents = 1; /* So the task can be started */
pTask->hSelf = hTask;
pTask->flags = 0;
if (pModule->flags & NE_FFLAGS_WIN32)
pTask->flags |= TDBF_WIN32;
if (pModule->lpDosTask)
pTask->flags |= TDBF_WINOLDAP;
pTask->version = pModule->expected_version;
pTask->hInstance = hInstance;
pTask->hPrevInstance = hPrevInstance;
pTask->hModule = pModule->self;
pTask->hParent = GetCurrentTask();
pTask->magic = TDB_MAGIC;
pTask->nCmdShow = cmdShow;
pTask->thdb = thdb;
pTask->curdrive = DRIVE_GetCurrentDrive() | 0x80;
strcpy( pTask->curdir, "\\" );
lstrcpyn32A( 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 */
GetModuleName( 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(PDB),
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( GlobalHandleToSel(pTask->hPDB),
(int)&((PDB *)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++;
lstrcpyn32A( 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 = GetProfileInt32A( "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 */
FarSetOwner( 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 );
/* Inherit default UserSignalHandler from initial process */
pInitialTask = (TDB *)GlobalLock16( PROCESS_Initial()->task );
if ( pInitialTask )
pTask->userhandler = pInitialTask->userhandler;
/* Create the 16-bit stack frame */
if (!(sp = pModule->sp))
sp = pSegTable[pModule->ss-1].minsize + pModule->stack_size;
sp &= ~1; sp -= 2*sizeof(STACK16FRAME);
pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( pTask->hInstance, sp );
frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
frame16->ebp = sp + (int)&((STACK16FRAME *)0)->bp;
frame16->bp = LOWORD(frame16->ebp);
frame16->ds = frame16->es = pTask->hInstance;
frame16->fs = 0;
frame16->entry_point = 0;
frame16->entry_cs = 0;
frame16->mutex_count = 1; /* TASK_Reschedule is called from 16-bit code */
/* The remaining fields will be initialized in TASK_Reschedule */
/* Create the 32-bit stack frame */
stack32Top = (char*)pTask->thdb->teb.stack_top;
frame16->frame32 = frame32 = (STACK32FRAME *)stack32Top - 1;
frame32->frame16 = pTask->thdb->cur_stack + sizeof(STACK16FRAME);
frame32->edi = 0;
frame32->esi = 0;
frame32->edx = 0;
frame32->ecx = 0;
frame32->ebx = 0;
frame32->retaddr = (DWORD)TASK_CallToStart;
/* The remaining fields will be initialized in TASK_Reschedule */
TRACE(task, "module='%s' cmdline='%s' task=%04x\n",
name, cmd_line, hTask );
return hTask;
}
/***********************************************************************
* TASK_StartTask
*
* 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.
*/
void TASK_StartTask( HTASK16 hTask )
{
/* Add the task to the linked list */
SYSLEVEL_EnterWin16Lock();
TASK_LinkTask( hTask );
SYSLEVEL_LeaveWin16Lock();
TRACE(task, "linked task %04x\n", hTask );
/* If requested, add entry point breakpoint */
if ( TASK_AddTaskEntryBreakpoint )
TASK_AddTaskEntryBreakpoint( hTask );
/* Get the task up and running. If we ourselves are a 16-bit task,
we simply Yield(). If we are 32-bit however, we need to signal
the main process somehow (NOT YET IMPLEMENTED!) */
if ( THREAD_IsWin16( THREAD_Current() ) )
OldYield();
else
FIXME(task, "Don't know how to start 16-bit task from 32-bit thread. Move the mouse!\n");
}
/***********************************************************************
* 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 */
K32OBJ_DecCount( &pTask->thdb->process->header );
K32OBJ_DecCount( &pTask->thdb->header );
/* 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). */
GlobalFreeAll( hPDB );
}
/***********************************************************************
* 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( INT16 exitCode )
{
TDB* pTask = (TDB*) GlobalLock16( GetCurrentTask() );
NE_MODULE* pModule = NE_GetPtr( pTask->hModule );
if (!pTask) USER_ExitWindows(); /* No current task yet */
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
return;
}
/* Enter the Win16Lock to protect global data structures
NOTE: We never explicitly leave it again. This shouldn't matter
though, as it will be released in TASK_Reschedule and this
task won't ever get scheduled again ... */
SYSLEVEL_EnterWin16Lock();
assert(hCurrentTask == GetCurrentTask());
TRACE(task, "Killing task %04x\n", hCurrentTask );
/* Delete active sockets */
if( pTask->pwsi )
WINSOCK_DeleteTaskWSI( pTask, pTask->pwsi );
#ifdef MZ_SUPPORTED
/* Kill DOS VM task */
if ( pModule->lpDosTask )
MZ_KillModule( pModule->lpDosTask );
#endif
/* Perform USER cleanup */
if (pTask->userhandler)
pTask->userhandler( hCurrentTask, USIG_TERMINATION, 0,
pTask->hInstance, pTask->hQueue );
if (hTaskToKill && (hTaskToKill != hCurrentTask))
{
/* If another task is already marked for destruction, */
/* we can kill it now, as we are in another context. */
TASK_DeleteTask( hTaskToKill );
}
if (nTaskCount <= 1)
{
TRACE(task, "this is the last task, exiting\n" );
USER_ExitWindows();
}
if (!__winelib)
{
/* 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 :-/
*/
HTASK16 hTask = PROCESS_Initial()->task;
HMODULE16 hModule = GetModuleHandle16( "USER" );
FARPROC16 postFunc = WIN32_GetProcAddress16( hModule, "PostAppMessage" );
if (postFunc)
Callbacks->CallPostAppMessageProc( postFunc, hTask, WM_NULL, 0, 0 );
}
/* Remove the task from the list to be sure we never switch back to it */
TASK_UnlinkTask( hCurrentTask );
if( nTaskCount )
{
TDB* p = (TDB *)GlobalLock16( hFirstTask );
while( p )
{
if( p->hYieldTo == hCurrentTask ) p->hYieldTo = 0;
p = (TDB *)GlobalLock16( p->hNext );
}
}
hTaskToKill = hCurrentTask;
hLockedTask = 0;
pTask->nEvents = 0;
TASK_YieldToSystem(pTask);
/* We should never return from this Yield() */
ERR(task,"Return of the living dead %04x!!!\n", hCurrentTask);
exit(1);
}
/***********************************************************************
* TASK_Reschedule
*
* This is where all the magic of task-switching happens!
*
* Note: This function should only be called via the TASK_YieldToSystem()
* wrapper, to make sure that all the context is saved correctly.
*
* It must not call functions that may yield control.
*/
void TASK_Reschedule(void)
{
TDB *pOldTask = NULL, *pNewTask;
HTASK16 hTask = 0;
STACK16FRAME *newframe16;
/* Get the initial task up and running */
if (!hCurrentTask && GetCurrentTask())
{
/* We need to remove one pair of stackframes (exept for Winelib) */
STACK16FRAME *oldframe16 = CURRENT_STACK16;
STACK32FRAME *oldframe32 = oldframe16->frame32;
STACK16FRAME *newframe16 = PTR_SEG_TO_LIN( oldframe32->frame16 );
STACK32FRAME *newframe32 = newframe16->frame32;
if (newframe32)
{
newframe16->entry_ip = oldframe16->entry_ip;
newframe16->entry_cs = oldframe16->entry_cs;
newframe16->ip = oldframe16->ip;
newframe16->cs = oldframe16->cs;
newframe32->ebp = oldframe32->ebp;
newframe32->restore_addr = oldframe32->restore_addr;
newframe32->codeselector = oldframe32->codeselector;
THREAD_Current()->cur_stack = oldframe32->frame16;
}
hCurrentTask = GetCurrentTask();
pNewTask = (TDB *)GlobalLock16( hCurrentTask );
pNewTask->ss_sp = pNewTask->thdb->cur_stack;
return;
}
/* NOTE: As we are entered from 16-bit code, we hold the Win16Lock.
We hang onto it thoughout most of this routine, so that accesses
to global variables (most notably the task list) are protected. */
assert(hCurrentTask == GetCurrentTask());
TRACE(task, "entered with hTask %04x (pid %d)\n", hCurrentTask, getpid());
#ifdef CONFIG_IPC
/* FIXME: What about the Win16Lock ??? */
dde_reschedule();
#endif
/* First check if there's a task to kill */
if (hTaskToKill && (hTaskToKill != hCurrentTask))
{
TASK_DeleteTask( hTaskToKill );
hTaskToKill = 0;
}
/* Find a task to yield to */
pOldTask = (TDB *)GlobalLock16( hCurrentTask );
if (pOldTask && pOldTask->hYieldTo)
{
/* check for DirectedYield() */
hTask = pOldTask->hYieldTo;
pNewTask = (TDB *)GlobalLock16( hTask );
if( !pNewTask || !pNewTask->nEvents) hTask = 0;
pOldTask->hYieldTo = 0;
}
/* extract hardware events only! */
if (!hTask) EVENT_WaitNetEvent( FALSE, TRUE );
while (!hTask)
{
/* Find a task that has an event pending */
hTask = hFirstTask;
while (hTask)
{
pNewTask = (TDB *)GlobalLock16( hTask );
TRACE(task, "\ttask = %04x, events = %i\n", hTask, pNewTask->nEvents);
if (pNewTask->nEvents) break;
hTask = pNewTask->hNext;
}
if (hLockedTask && (hTask != hLockedTask)) hTask = 0;
if (hTask) break;
/* No task found, wait for some events to come in */
/* NOTE: We release the Win16Lock while waiting for events. This is to enable
Win32 threads to thunk down to 16-bit temporarily. Since Win16
tasks won't execute and Win32 threads are not allowed to enter
TASK_Reschedule anyway, there should be no re-entrancy problem ... */
SYSLEVEL_ReleaseWin16Lock();
EVENT_WaitNetEvent( TRUE, TRUE );
SYSLEVEL_RestoreWin16Lock();
}
if (hTask == hCurrentTask)
{
TRACE(task, "returning to the current task(%04x)\n", hTask );
return; /* Nothing to do */
}
pNewTask = (TDB *)GlobalLock16( hTask );
TRACE(task, "Switching to task %04x (%.8s)\n",
hTask, pNewTask->module_name );
/* Make the task the last in the linked list (round-robin scheduling) */
pNewTask->priority++;
TASK_UnlinkTask( hTask );
TASK_LinkTask( hTask );
pNewTask->priority--;
/* Finish initializing the new task stack if necessary */
newframe16 = THREAD_STACK16( pNewTask->thdb );
if (!newframe16->entry_cs)
{
STACK16FRAME *oldframe16 = CURRENT_STACK16;
STACK32FRAME *oldframe32 = oldframe16->frame32;
STACK32FRAME *newframe32 = newframe16->frame32;
newframe16->entry_ip = oldframe16->entry_ip;
newframe16->entry_cs = oldframe16->entry_cs;
newframe16->ip = oldframe16->ip;
newframe16->cs = oldframe16->cs;
newframe32->ebp = oldframe32->ebp;
newframe32->restore_addr = oldframe32->restore_addr;
newframe32->codeselector = oldframe32->codeselector;
}
/* Switch to the new stack */
/* NOTE: We need to release/restore the Win16Lock, as the task
switched to might be at another recursion level than
the old task ... */
SYSLEVEL_ReleaseWin16Lock();
hCurrentTask = hTask;
SET_CUR_THREAD( pNewTask->thdb );
pNewTask->ss_sp = pNewTask->thdb->cur_stack;
SYSLEVEL_RestoreWin16Lock();
}
/***********************************************************************
* TASK_YieldToSystem
*
* Scheduler interface, this way we ensure that all "unsafe" events are
* processed outside the scheduler.
*/
void TASK_YieldToSystem(TDB* pTask)
{
MESSAGEQUEUE* pQ;
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
return;
}
Callbacks->CallTaskRescheduleProc();
if( pTask )
{
pQ = (MESSAGEQUEUE*)GlobalLock16(pTask->hQueue);
if( pQ && pQ->flags & QUEUE_FLAG_XEVENT &&
!(pQ->wakeBits & (QS_SENDMESSAGE | QS_SMRESULT)) )
{
pQ->flags &= ~QUEUE_FLAG_XEVENT;
EVENT_WaitNetEvent( FALSE, FALSE );
}
}
}
/***********************************************************************
* InitTask (KERNEL.91)
*
* Called by the application startup code.
*/
void WINAPI InitTask( CONTEXT *context )
{
TDB *pTask;
NE_MODULE *pModule;
SEGTABLEENTRY *pSegTable;
INSTANCEDATA *pinstance;
LONG stacklow, stackhi;
if (context) EAX_reg(context) = 0;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
if (!(pModule = NE_GetPtr( pTask->hModule ))) return;
/* Initialize implicitly loaded DLLs */
NE_InitializeDLLs( pTask->hModule );
if (context)
{
/* 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
*/
SEGPTR ptr = STACK16_PUSH( pTask->thdb, sizeof(WORD) );
*(WORD *)PTR_SEG_TO_LIN(ptr) = 0;
SP_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) = 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;
pinstance->stackmin = OFFSETOF( pTask->thdb->cur_stack );
}
/***********************************************************************
* WaitEvent (KERNEL.30)
*/
BOOL16 WINAPI WaitEvent( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = GetCurrentTask();
pTask = (TDB *)GlobalLock16( hTask );
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
return TRUE;
}
if (pTask->nEvents > 0)
{
pTask->nEvents--;
return FALSE;
}
TASK_YieldToSystem(pTask);
/* When we get back here, we have an event */
if (pTask->nEvents > 0) pTask->nEvents--;
return TRUE;
}
/***********************************************************************
* PostEvent (KERNEL.31)
*/
void WINAPI PostEvent( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
WARN(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
/* return; */
}
pTask->nEvents++;
}
/***********************************************************************
* SetPriority (KERNEL.32)
*/
void WINAPI SetPriority( 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 LockCurrentTask( BOOL16 bLock )
{
if (bLock) hLockedTask = GetCurrentTask();
else hLockedTask = 0;
return hLockedTask;
}
/***********************************************************************
* IsTaskLocked (KERNEL.122)
*/
HTASK16 WINAPI IsTaskLocked(void)
{
return hLockedTask;
}
/***********************************************************************
* OldYield (KERNEL.117)
*/
void WINAPI OldYield(void)
{
TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
return;
}
if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */
TASK_YieldToSystem(pCurTask);
if (pCurTask) pCurTask->nEvents--;
}
/***********************************************************************
* DirectedYield (KERNEL.150)
*/
void WINAPI DirectedYield( HTASK16 hTask )
{
TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
return;
}
TRACE(task, "%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
pCurTask->hYieldTo = hTask;
OldYield();
TRACE(task, "%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
}
/***********************************************************************
* UserYield (USER.332)
*/
void WINAPI UserYield(void)
{
TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
return;
}
/* Handle sent messages */
while (queue && (queue->wakeBits & QS_SENDMESSAGE))
QUEUE_ReceiveMessage( queue );
OldYield();
queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
while (queue && (queue->wakeBits & QS_SENDMESSAGE))
QUEUE_ReceiveMessage( queue );
}
/***********************************************************************
* Yield16 (KERNEL.29)
*/
void WINAPI Yield16(void)
{
TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
if ( !THREAD_IsWin16( THREAD_Current() ) )
{
FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
return;
}
if (pCurTask) pCurTask->hYieldTo = 0;
if (pCurTask && pCurTask->hQueue) UserYield();
else OldYield();
}
/***********************************************************************
* 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 (!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 );
}
/**********************************************************************
* GetCodeHandle (KERNEL.93)
*/
HANDLE16 WINAPI GetCodeHandle( FARPROC16 proc )
{
HANDLE16 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 = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
else
handle = GlobalHandle16( HIWORD(proc) );
return handle;
}
/**********************************************************************
* GetCodeInfo (KERNEL.104)
*/
VOID WINAPI GetCodeInfo( FARPROC16 proc, SEGINFO *segInfo )
{
BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
NE_MODULE *pModule = NULL;
SEGTABLEENTRY *pSeg = NULL;
WORD segNr;
/* proc is either a thunk, or else a pair of module handle
and segment number. In the first case, we also need to
extract module and segment number. */
if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
{
WORD selector = thunk[6] + (thunk[7] << 8);
pModule = NE_GetPtr( GlobalHandle16( selector ) );
pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
if ( pModule )
for ( segNr = 0; segNr < pModule->seg_count; segNr++, pSeg++ )
if ( GlobalHandleToSel(pSeg->hSeg) == selector )
break;
if ( pModule && segNr >= pModule->seg_count )
pSeg = NULL;
}
else
{
pModule = NE_GetPtr( HIWORD( proc ) );
segNr = LOWORD( proc );
if ( pModule && segNr < pModule->seg_count )
pSeg = NE_SEG_TABLE( pModule ) + segNr;
}
/* fill in segment information */
segInfo->offSegment = pSeg? pSeg->filepos : 0;
segInfo->cbSegment = pSeg? pSeg->size : 0;
segInfo->flags = pSeg? pSeg->flags : 0;
segInfo->cbAlloc = pSeg? pSeg->minsize : 0;
segInfo->h = pSeg? pSeg->hSeg : 0;
segInfo->alignShift = pModule? pModule->alignment : 0;
}
/**********************************************************************
* DefineHandleTable16 (KERNEL.94)
*/
BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
{
return TRUE; /* FIXME */
}
/***********************************************************************
* SetTaskQueue (KERNEL.34)
*/
HQUEUE16 WINAPI SetTaskQueue( 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;
TIMER_SwitchQueue( hPrev, hQueue );
return hPrev;
}
/***********************************************************************
* GetTaskQueue (KERNEL.35)
*/
HQUEUE16 WINAPI GetTaskQueue( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
return pTask->hQueue;
}
/***********************************************************************
* SetThreadQueue (KERNEL.463)
*/
HQUEUE16 WINAPI SetThreadQueue( DWORD thread, HQUEUE16 hQueue )
{
THDB *thdb = THREAD_IdToTHDB( thread );
HQUEUE16 oldQueue = thdb? thdb->teb.queue : 0;
if ( thdb )
{
thdb->teb.queue = hQueue;
if ( GetTaskQueue( thdb->process->task ) == oldQueue )
SetTaskQueue( thdb->process->task, hQueue );
}
return oldQueue;
}
/***********************************************************************
* GetThreadQueue (KERNEL.464)
*/
HQUEUE16 WINAPI GetThreadQueue( DWORD thread )
{
THDB *thdb = THREAD_IdToTHDB( thread );
return (HQUEUE16)(thdb? thdb->teb.queue : 0);
}
/***********************************************************************
* SetFastQueue (KERNEL.624)
*/
VOID WINAPI SetFastQueue( DWORD thread, HANDLE32 hQueue )
{
THDB *thdb = THREAD_IdToTHDB( thread );
if ( thdb ) thdb->teb.queue = (HQUEUE16) hQueue;
}
/***********************************************************************
* GetFastQueue (KERNEL.625)
*/
HANDLE32 WINAPI GetFastQueue( void )
{
THDB *thdb = THREAD_Current();
if (!thdb) return 0;
if (!(thdb->teb.queue))
{
HMODULE16 hModule = GetModuleHandle16( "USER" );
FARPROC16 proc = WIN32_GetProcAddress16( hModule, "InitThreadInput" );
Callbacks->CallBootAppProc( proc, 0, THREAD_IsWin16(thdb)? 4 : 5 ); /* FIXME! */
}
if (!(thdb->teb.queue))
FIXME( task, "(): should initialize thread-local queue, expect failure!\n" );
return (HANDLE32)thdb->teb.queue;
}
/***********************************************************************
* SwitchStackTo (KERNEL.108)
*/
void WINAPI SwitchStackTo( 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->thdb->cur_stack ),
OFFSETOF( pTask->thdb->cur_stack ), seg, ptr );
/* Save the old stack */
oldFrame = THREAD_STACK16( pTask->thdb );
/* pop frame + args and push bp */
pData->old_ss_sp = pTask->thdb->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->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg, ptr - copySize );
newFrame = THREAD_STACK16( pTask->thdb );
/* 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 SwitchStackBack( CONTEXT *context )
{
TDB *pTask;
STACK16FRAME *oldFrame, *newFrame;
INSTANCEDATA *pData;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(pTask->thdb->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 = THREAD_STACK16( pTask->thdb );
/* 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 */
pTask->thdb->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 = THREAD_STACK16( pTask->thdb );
newFrame->frame32 = oldFrame->frame32;
if (TRACE_ON(relay))
{
newFrame->entry_ip = oldFrame->entry_ip;
newFrame->entry_cs = oldFrame->entry_cs;
}
}
/***********************************************************************
* GetTaskQueueDS (KERNEL.118)
*/
void WINAPI GetTaskQueueDS( CONTEXT *context )
{
DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
}
/***********************************************************************
* GetTaskQueueES (KERNEL.119)
*/
void WINAPI GetTaskQueueES( CONTEXT *context )
{
ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
}
/***********************************************************************
* GetCurrentTask (KERNEL.36)
*/
HTASK16 WINAPI GetCurrentTask(void)
{
return THREAD_InitDone? PROCESS_Current()->task : 0;
}
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 GetCurrentPDB(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
return MAKELONG(pTask->hPDB, 0); /* FIXME */
}
/***********************************************************************
* GetInstanceData (KERNEL.54)
*/
INT16 WINAPI GetInstanceData( 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 GetExeVersion(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
return pTask->version;
}
/***********************************************************************
* SetErrorMode16 (KERNEL.107)
*/
UINT16 WINAPI SetErrorMode16( UINT16 mode )
{
TDB *pTask;
UINT16 oldMode;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
oldMode = pTask->error_mode;
pTask->error_mode = mode;
pTask->thdb->process->error_mode = mode;
return oldMode;
}
/***********************************************************************
* SetErrorMode32 (KERNEL32.486)
*/
UINT32 WINAPI SetErrorMode32( UINT32 mode )
{
return SetErrorMode16( (UINT16)mode );
}
/***********************************************************************
* GetDOSEnvironment (KERNEL.131)
*/
SEGPTR WINAPI GetDOSEnvironment(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 GetNumTasks(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 GetTaskDS(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
return pTask->hInstance;
}
/***********************************************************************
* GetDummyModuleHandleDS (KERNEL.602)
*/
VOID WINAPI GetDummyModuleHandleDS( CONTEXT *context )
{
TDB *pTask;
WORD selector;
AX_reg( context ) = 0;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
if (!(pTask->flags & TDBF_WIN32)) return;
selector = GlobalHandleToSel( pTask->hModule );
DS_reg( context ) = selector;
AX_reg( context ) = selector;
}
/***********************************************************************
* IsTask (KERNEL.320)
*/
BOOL16 WINAPI IsTask( HTASK16 hTask )
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
return (pTask->magic == TDB_MAGIC);
}
/***********************************************************************
* SetTaskSignalProc (KERNEL.38)
*
* Real 16-bit interface is provided by the THUNK_SetTaskSignalProc.
*/
FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
{
TDB *pTask;
FARPROC16 oldProc;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
oldProc = (FARPROC16)pTask->userhandler;
pTask->userhandler = (USERSIGNALPROC)proc;
return oldProc;
}
/***********************************************************************
* SetSigHandler (KERNEL.140)
*/
WORD WINAPI SetSigHandler( 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 GlobalNotify( FARPROC16 proc )
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
pTask->discardhandler = proc;
}
/***********************************************************************
* GetExePtr (KERNEL.133)
*/
static 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 = FarGetOwner( 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 GetExePtr( HANDLE16 handle )
{
HTASK16 dummy;
return GetExePtrHelper( handle, &dummy );
}
void WINAPI WIN16_GetExePtr( CONTEXT *context )
{
WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
HANDLE16 handle = (HANDLE16)stack[2];
HTASK16 hTask = 0;
HMODULE16 hModule;
hModule = GetExePtrHelper( handle, &hTask );
AX_reg(context) = CX_reg(context) = hModule;
if (hTask) ES_reg(context) = hTask;
}
/***********************************************************************
* TaskFirst (TOOLHELP.63)
*/
BOOL16 WINAPI TaskFirst( TASKENTRY *lpte )
{
lpte->hNext = hFirstTask;
return TaskNext( lpte );
}
/***********************************************************************
* TaskNext (TOOLHELP.64)
*/
BOOL16 WINAPI TaskNext( 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->thdb->cur_stack );
lpte->wSP = OFFSETOF( pTask->thdb->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 TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
{
lpte->hNext = hTask;
return TaskNext( lpte );
}
/***********************************************************************
* GetAppCompatFlags16 (KERNEL.354)
*/
DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
{
return GetAppCompatFlags32( hTask );
}
/***********************************************************************
* GetAppCompatFlags32 (USER32.206)
*/
DWORD WINAPI GetAppCompatFlags32( HTASK32 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;
}
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