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Sweden-Number/loader/task.c

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/*
* Task functions
*
* Copyright 1995 Alexandre Julliard
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "windows.h"
#include "task.h"
#include "callback.h"
#include "debugger.h"
#include "global.h"
#include "instance.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"
/* 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
static HTASK hFirstTask = 0;
static HTASK hCurrentTask = 0;
static HTASK hTaskToKill = 0;
static HTASK hLockedTask = 0;
static WORD nTaskCount = 0;
/* TASK_Reschedule() 16-bit entry point */
static FARPROC TASK_RescheduleProc;
#define TASK_SCHEDULE() CallTo16_word_(TASK_RescheduleProc,0)
/***********************************************************************
* TASK_Init
*/
BOOL TASK_Init(void)
{
TASK_RescheduleProc = (FARPROC)GetWndProcEntry16( "TASK_Reschedule" );
return TRUE;
}
/***********************************************************************
* 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;
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*/ );
/* This should never return */
fprintf( stderr, "TASK_CallToStart: Main program returned!\n" );
exit(1);
}
/***********************************************************************
* TASK_CreateTask
*/
HTASK TASK_CreateTask( HMODULE hModule, HANDLE hInstance, HANDLE hPrevInstance,
HANDLE hEnvironment, char *cmdLine, WORD cmdShow )
{
HTASK hTask;
TDB *pTask;
NE_MODULE *pModule;
SEGTABLEENTRY *pSegTable;
LPSTR name;
char *stack16Top, *stack32Top;
STACK16FRAME *frame16;
STACK32FRAME *frame32;
extern DWORD CALL16_RetAddr_word;
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 );
/* 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;
pTask->curdrive = 'C' - 'A' + 0x80;
pTask->magic = TDB_MAGIC;
pTask->nCmdShow = cmdShow;
strcpy( pTask->curdir, "WINDOWS" );
/* 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() */
pTask->pdb.savedint22 = INT_GetHandler( 0x22 );
pTask->pdb.savedint23 = INT_GetHandler( 0x23 );
pTask->pdb.savedint24 = INT_GetHandler( 0x24 );
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 );
/* Allocate a code segment alias for the TDB */
pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
sizeof(TDB), pTask->hPDB, TRUE,
FALSE, FALSE );
/* 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 */
pTask->hStack32 = GLOBAL_Alloc( GMEM_FIXED, STACK32_SIZE, pTask->hPDB,
FALSE, FALSE, FALSE );
/* Create the 32-bit stack frame */
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;
stack16Top = (char *)PTR_SEG_OFF_TO_LIN( pTask->ss, pTask->sp );
frame16 = (STACK16FRAME *)stack16Top - 1;
frame16->saved_ss = pTask->ss;
frame16->saved_sp = pTask->sp;
frame16->ds = 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)
{
fprintf( stderr, "Task '%s': ", name );
DEBUG_AddBreakpoint( pSegTable[pModule->cs-1].selector, pModule->ip );
}
/* Add the task to the linked list */
TASK_LinkTask( hTask );
dprintf_task( stddeb, "CreateTask: module='%s' cmdline='%s' task=%04x\n",
name, cmdLine, hTask );
return hTask;
}
/***********************************************************************
* TASK_DeleteTask
*/
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 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 never return from Yield() */
}
/***********************************************************************
* 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;
/* First check if there's a task to kill */
if (hTaskToKill && (hTaskToKill != hCurrentTask))
TASK_DeleteTask( hTaskToKill );
/* 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 %04x (%.8s)\n",
hTask, pNewTask->module_name );
/* Save the stacks of the previous task (if any) */
if (pOldTask)
{
pOldTask->ss = IF1632_Saved16_ss;
pOldTask->sp = IF1632_Saved16_sp;
pOldTask->esp = IF1632_Saved32_esp;
}
else IF1632_Original32_esp = IF1632_Saved32_esp;
/* 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;
IF1632_Saved16_ss = pNewTask->ss;
IF1632_Saved16_sp = pNewTask->sp;
IF1632_Saved32_esp = pNewTask->esp;
IF1632_Stack32_base = WIN16_GlobalLock( pNewTask->hStack32 );
}
/***********************************************************************
* 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;
context.sc_eax = 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;
}
NE_InitializeDLLs( 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
*/
context.sc_eax = 1;
context.sc_ebx = 0x81;
context.sc_ecx = pModule->stack_size;
context.sc_edx = pTask->nCmdShow;
context.sc_esi = pTask->hPrevInstance;
context.sc_edi = pTask->hInstance;
context.sc_es = 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 = IF1632_Saved16_sp;
}
/***********************************************************************
* 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,%04x): got thunk %08lx\n",
(SEGPTR)func, hInstance, (SEGPTR)thunkaddr );
*thunk++ = 0xb8; /* movw instance, %ax */
*thunk++ = (BYTE)(hInstance & 0xff);
*thunk++ = (BYTE)(hInstance >> 8);
*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 %04x\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;
}
/***********************************************************************
* GetCurrentTask (KERNEL.36)
*/
HTASK GetCurrentTask(void)
{
/* Undocumented: first task is returned in high word */
return MAKELONG( hCurrentTask, hFirstTask );
}
/***********************************************************************
* GetCurrentPDB (KERNEL.37)
*/
WORD 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;
}
/***********************************************************************
* GetNumTasks (KERNEL.152)
*/
WORD GetNumTasks(void)
{
return nTaskCount;
}
/***********************************************************************
* GetTaskDS (KERNEL.155)
*/
WORD 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 */
owner = FarGetOwner( handle );
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=%04x\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 );
}
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