Sweden-Number/scheduler/syslevel.c

192 lines
5.0 KiB
C

/*
* Win32 'syslevel' routines
*
* Copyright 1998 Ulrich Weigand
*/
#include <unistd.h>
#include "syslevel.h"
#include "heap.h"
#include "stackframe.h"
#include "debug.h"
DEFAULT_DEBUG_CHANNEL(win32)
static CRITICAL_SECTION 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)
{
CRITICAL_SECTION **w16Mutex = SEGPTR_ALLOC(sizeof(CRITICAL_SECTION *));
*w16Mutex = &Win16Mutex;
segpWin16Mutex = SEGPTR_GET(w16Mutex);
InitializeCriticalSection(&Win16Mutex);
MakeCriticalSectionGlobal(&Win16Mutex);
}
/************************************************************************
* GetpWin16Lock32 (KERNEL32.93)
*/
VOID WINAPI GetpWin16Lock(CRITICAL_SECTION **lock)
{
*lock = &Win16Mutex;
}
/************************************************************************
* GetpWin16Lock16 (KERNEL.449)
*/
SEGPTR WINAPI GetpWin16Lock16(void)
{
return segpWin16Mutex;
}
/************************************************************************
* _EnterSysLevel (KERNEL32.97)
*/
VOID WINAPI _EnterSysLevel(CRITICAL_SECTION *lock)
{
EnterCriticalSection(lock);
if (lock == &Win16Mutex)
GET_FS( SYSLEVEL_Win16CurrentTeb );
}
/************************************************************************
* _LeaveSysLevel (KERNEL32.98)
*/
VOID WINAPI _LeaveSysLevel(CRITICAL_SECTION *lock)
{
LeaveCriticalSection(lock);
}
/************************************************************************
* (KERNEL32.86)
*/
VOID WINAPI _KERNEL32_86(CRITICAL_SECTION *lock)
{
_LeaveSysLevel(lock);
}
/************************************************************************
* SYSLEVEL_EnterWin16Lock [KERNEL.480]
*/
VOID WINAPI SYSLEVEL_EnterWin16Lock(VOID)
{
TRACE(win32, "thread %04x (pid %d) about to enter\n",
THREAD_Current()->teb_sel, getpid());
_EnterSysLevel(&Win16Mutex);
TRACE(win32, "thread %04x (pid %d) entered, count is %ld\n",
THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
}
/************************************************************************
* SYSLEVEL_LeaveWin16Lock [KERNEL.481]
*/
VOID WINAPI SYSLEVEL_LeaveWin16Lock(VOID)
{
TRACE(win32, "thread %04x (pid %d) about to leave, count is %ld\n",
THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
_LeaveSysLevel(&Win16Mutex);
}
/************************************************************************
* _CheckNotSysLevel (KERNEL32.94)
*/
VOID WINAPI _CheckNotSysLevel(CRITICAL_SECTION *lock)
{
FIXME(win32, "()\n");
}
/************************************************************************
* _ConfirmSysLevel (KERNEL32.95)
*/
VOID WINAPI _ConfirmSysLevel(CRITICAL_SECTION *lock)
{
FIXME(win32, "()\n");
}
/************************************************************************
* _ConfirmWin16Lock (KERNEL32.96)
*/
DWORD WINAPI _ConfirmWin16Lock(void)
{
if ( Win16Mutex.OwningThread == GetCurrentThreadId() )
return Win16Mutex.RecursionCount;
else
return 0L;
}
/************************************************************************
* ReleaseThunkLock (KERNEL32.48)
*/
VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
{
DWORD count = Win16Mutex.RecursionCount;
*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)
{
DWORD count;
TRACE(win32, "thread %04x (pid %d) about to release, count is %ld\n",
THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
ReleaseThunkLock(&count);
if (count > 0xffff)
ERR(win32, "Win16Mutex recursion count too large!\n");
CURRENT_STACK16->mutex_count = (WORD)count;
}
/************************************************************************
* SYSLEVEL_RestoreWin16Lock
*/
VOID SYSLEVEL_RestoreWin16Lock(VOID)
{
DWORD count = CURRENT_STACK16->mutex_count;
if (!count)
ERR(win32, "Win16Mutex recursion count is zero!\n");
TRACE(win32, "thread %04x (pid %d) about to restore (count %ld)\n",
THREAD_Current()->teb_sel, getpid(), count);
RestoreThunkLock(count);
TRACE(win32, "thread %04x (pid %d) restored lock, count is %ld\n",
THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
}