Sweden-Number/scheduler/syslevel.c

239 lines
6.4 KiB
C

/*
* Win32 'syslevel' routines
*
* Copyright 1998 Ulrich Weigand
*/
#include <unistd.h>
#include <sys/types.h>
#include "ntddk.h"
#include "syslevel.h"
#include "heap.h"
#include "selectors.h"
#include "stackframe.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(win32);
static SYSLEVEL Win16Mutex;
static SEGPTR segpWin16Mutex;
/* Global variable to save current TEB while in 16-bit code */
WORD SYSLEVEL_Win16CurrentTeb = 0;
/* TEB of initial process for emergency use */
WORD SYSLEVEL_EmergencyTeb = 0;
/************************************************************************
* SYSLEVEL_Init
*/
void SYSLEVEL_Init(void)
{
SYSLEVEL **w16Mutex = SEGPTR_ALLOC(sizeof(SYSLEVEL *));
*w16Mutex = &Win16Mutex;
segpWin16Mutex = SEGPTR_GET(w16Mutex);
_CreateSysLevel( &Win16Mutex, 1 );
}
/************************************************************************
* GetpWin16Lock (KERNEL32.93)
*/
VOID WINAPI GetpWin16Lock(SYSLEVEL **lock)
{
*lock = &Win16Mutex;
}
/************************************************************************
* GetpWin16Lock16 (KERNEL.449)
*/
SEGPTR WINAPI GetpWin16Lock16(void)
{
return segpWin16Mutex;
}
/************************************************************************
* _CreateSysLevel (KERNEL.438)
*/
VOID WINAPI _CreateSysLevel(SYSLEVEL *lock, INT level)
{
InitializeCriticalSection( &lock->crst );
lock->level = level;
TRACE("(%p, %d): handle is %d\n",
lock, level, lock->crst.LockSemaphore );
}
/************************************************************************
* _EnterSysLevel (KERNEL32.97) (KERNEL.439)
*/
VOID WINAPI _EnterSysLevel(SYSLEVEL *lock)
{
TEB *teb = NtCurrentTeb();
int i;
TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count before %ld\n",
lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
teb->sys_count[lock->level] );
for ( i = 3; i > lock->level; i-- )
if ( teb->sys_count[i] > 0 )
{
ERR("(%p, level %d): Holding %p, level %d. Expect deadlock!\n",
lock, lock->level, teb->sys_mutex[i], i );
}
EnterCriticalSection( &lock->crst );
teb->sys_count[lock->level]++;
teb->sys_mutex[lock->level] = lock;
TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count after %ld\n",
lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
teb->sys_count[lock->level] );
if (lock == &Win16Mutex)
SYSLEVEL_Win16CurrentTeb = __get_fs();
}
/************************************************************************
* _LeaveSysLevel (KERNEL32.98) (KERNEL.440)
*/
VOID WINAPI _LeaveSysLevel(SYSLEVEL *lock)
{
TEB *teb = NtCurrentTeb();
TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count before %ld\n",
lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
teb->sys_count[lock->level] );
if ( teb->sys_count[lock->level] <= 0 || teb->sys_mutex[lock->level] != lock )
{
ERR("(%p, level %d): Invalid state: count %ld mutex %p.\n",
lock, lock->level, teb->sys_count[lock->level],
teb->sys_mutex[lock->level] );
}
else
{
if ( --teb->sys_count[lock->level] == 0 )
teb->sys_mutex[lock->level] = NULL;
}
LeaveCriticalSection( &lock->crst );
TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count after %ld\n",
lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
teb->sys_count[lock->level] );
}
/************************************************************************
* _KERNEL32_86 (KERNEL32.86)
*/
VOID WINAPI _KERNEL32_86(SYSLEVEL *lock)
{
_LeaveSysLevel(lock);
}
/************************************************************************
* _ConfirmSysLevel (KERNEL32.95) (KERNEL.436)
*/
DWORD WINAPI _ConfirmSysLevel(SYSLEVEL *lock)
{
if ( lock && lock->crst.OwningThread == GetCurrentThreadId() )
return lock->crst.RecursionCount;
else
return 0L;
}
/************************************************************************
* _CheckNotSysLevel (KERNEL32.94) (KERNEL.437)
*/
VOID WINAPI _CheckNotSysLevel(SYSLEVEL *lock)
{
FIXME("(%p)\n", lock);
}
/************************************************************************
* SYSLEVEL_EnterWin16Lock [KERNEL.480]
*/
VOID WINAPI SYSLEVEL_EnterWin16Lock(VOID)
{
_EnterSysLevel(&Win16Mutex);
}
/************************************************************************
* SYSLEVEL_LeaveWin16Lock [KERNEL.481]
*/
VOID WINAPI SYSLEVEL_LeaveWin16Lock(VOID)
{
_LeaveSysLevel(&Win16Mutex);
}
/************************************************************************
* _ConfirmWin16Lock (KERNEL32.96)
*/
DWORD WINAPI _ConfirmWin16Lock(void)
{
return _ConfirmSysLevel(&Win16Mutex);
}
/************************************************************************
* ReleaseThunkLock (KERNEL32.48)
*/
VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
{
DWORD count = _ConfirmSysLevel(&Win16Mutex);
*mutex_count = count;
while (count-- > 0)
_LeaveSysLevel(&Win16Mutex);
}
/************************************************************************
* RestoreThunkLock (KERNEL32.49)
*/
VOID WINAPI RestoreThunkLock(DWORD mutex_count)
{
while (mutex_count-- > 0)
_EnterSysLevel(&Win16Mutex);
}
/************************************************************************
* SYSLEVEL_ReleaseWin16Lock
*/
VOID SYSLEVEL_ReleaseWin16Lock(VOID)
{
/* entry_point is never used again once the entry point has
been called. Thus we re-use it to hold the Win16Lock count */
ReleaseThunkLock(&CURRENT_STACK16->entry_point);
}
/************************************************************************
* SYSLEVEL_RestoreWin16Lock
*/
VOID SYSLEVEL_RestoreWin16Lock(VOID)
{
RestoreThunkLock(CURRENT_STACK16->entry_point);
}
/************************************************************************
* SYSLEVEL_CheckNotLevel
*/
VOID SYSLEVEL_CheckNotLevel( INT level )
{
INT i;
for ( i = 3; i >= level; i-- )
if ( NtCurrentTeb()->sys_count[i] > 0 )
{
ERR("(%d): Holding lock of level %d!\n",
level, i );
DbgBreakPoint();
break;
}
}