scheduler/syslevel.c

   1 /*
   2  * Win32 'syslevel' routines
   3  *
   4  * Copyright 1998 Ulrich Weigand
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <unistd.h>
  22 #include <sys/types.h>
  23 #include "ntddk.h"
  24 #include "syslevel.h"
  25 #include "stackframe.h"
  26 #include "wine/library.h"
  27 #include "wine/debug.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(win32);
  30
  31 static SYSLEVEL Win16Mutex = { CRITICAL_SECTION_INIT("Win16Mutex"), 1 };
  32
  33 /* Global variable to save current TEB while in 16-bit code */
  34 WORD SYSLEVEL_Win16CurrentTeb = 0;
  35
  36
  37 /************************************************************************
  38  *           GetpWin16Lock    (KERNEL32.93)
  39  */
  40 VOID WINAPI GetpWin16Lock(SYSLEVEL **lock)
  41 {
  42     *lock = &Win16Mutex;
  43 }
  44
  45 /************************************************************************
  46  *           GetpWin16Lock    (KERNEL.449)
  47  */
  48 SEGPTR WINAPI GetpWin16Lock16(void)
  49 {
  50     static SYSLEVEL *w16Mutex;
  51     static SEGPTR segpWin16Mutex;
  52
  53     if (!segpWin16Mutex)
  54     {
  55         w16Mutex = &Win16Mutex;
  56         segpWin16Mutex = MapLS( &w16Mutex );
  57     }
  58     return segpWin16Mutex;
  59 }
  60
  61 /************************************************************************
  62  *           _CreateSysLevel    (KERNEL.438)
  63  */
  64 VOID WINAPI _CreateSysLevel(SYSLEVEL *lock, INT level)
  65 {
  66     InitializeCriticalSection( &lock->crst );
  67     lock->level = level;
  68
  69     TRACE("(%p, %d): handle is %d\n",
  70                   lock, level, lock->crst.LockSemaphore );
  71 }
  72
  73 /************************************************************************
  74  *           _EnterSysLevel    (KERNEL32.97)
  75  *           _EnterSysLevel    (KERNEL.439)
  76  */
  77 VOID WINAPI _EnterSysLevel(SYSLEVEL *lock)
  78 {
  79     TEB *teb = NtCurrentTeb();
  80     int i;
  81
  82     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count before %ld\n",
  83                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
  84                   teb->sys_count[lock->level] );
  85
  86     for ( i = 3; i > lock->level; i-- )
  87         if ( teb->sys_count[i] > 0 )
  88         {
  89             ERR("(%p, level %d): Holding %p, level %d. Expect deadlock!\n",
  90                         lock, lock->level, teb->sys_mutex[i], i );
  91         }
  92
  93     EnterCriticalSection( &lock->crst );
  94
  95     teb->sys_count[lock->level]++;
  96     teb->sys_mutex[lock->level] = lock;
  97
  98     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count after  %ld\n",
  99                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 100                   teb->sys_count[lock->level] );
 101
 102     if (lock == &Win16Mutex)
 103         SYSLEVEL_Win16CurrentTeb = wine_get_fs();
 104 }
 105
 106 /************************************************************************
 107  *           _LeaveSysLevel    (KERNEL32.98)
 108  *           _LeaveSysLevel    (KERNEL.440)
 109  */
 110 VOID WINAPI _LeaveSysLevel(SYSLEVEL *lock)
 111 {
 112     TEB *teb = NtCurrentTeb();
 113
 114     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count before %ld\n",
 115                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 116                   teb->sys_count[lock->level] );
 117
 118     if ( teb->sys_count[lock->level] <= 0 || teb->sys_mutex[lock->level] != lock )
 119     {
 120         ERR("(%p, level %d): Invalid state: count %ld mutex %p.\n",
 121                     lock, lock->level, teb->sys_count[lock->level],
 122                     teb->sys_mutex[lock->level] );
 123     }
 124     else
 125     {
 126         if ( --teb->sys_count[lock->level] == 0 )
 127             teb->sys_mutex[lock->level] = NULL;
 128     }
 129
 130     LeaveCriticalSection( &lock->crst );
 131
 132     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count after  %ld\n",
 133                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 134                   teb->sys_count[lock->level] );
 135 }
 136
 137 /************************************************************************
 138  *              @ (KERNEL32.86)
 139  */
 140 VOID WINAPI _KERNEL32_86(SYSLEVEL *lock)
 141 {
 142     _LeaveSysLevel(lock);
 143 }
 144
 145 /************************************************************************
 146  *           _ConfirmSysLevel    (KERNEL32.95)
 147  *           _ConfirmSysLevel    (KERNEL.436)
 148  */
 149 DWORD WINAPI _ConfirmSysLevel(SYSLEVEL *lock)
 150 {
 151     if ( lock && lock->crst.OwningThread == GetCurrentThreadId() )
 152         return lock->crst.RecursionCount;
 153     else
 154         return 0L;
 155 }
 156
 157 /************************************************************************
 158  *           _CheckNotSysLevel    (KERNEL32.94)
 159  *           _CheckNotSysLevel    (KERNEL.437)
 160  */
 161 VOID WINAPI _CheckNotSysLevel(SYSLEVEL *lock)
 162 {
 163     if (lock && lock->crst.OwningThread == GetCurrentThreadId() && lock->crst.RecursionCount)
 164     {
 165         ERR( "Holding lock %p level %d\n", lock, lock->level );
 166         DbgBreakPoint();
 167     }
 168 }
 169
 170
 171 /************************************************************************
 172  *           _EnterWin16Lock                    [KERNEL.480]
 173  */
 174 VOID WINAPI _EnterWin16Lock(void)
 175 {
 176     _EnterSysLevel(&Win16Mutex);
 177 }
 178
 179 /************************************************************************
 180  *           _LeaveWin16Lock            [KERNEL.481]
 181  */
 182 VOID WINAPI _LeaveWin16Lock(void)
 183 {
 184     _LeaveSysLevel(&Win16Mutex);
 185 }
 186
 187 /************************************************************************
 188  *           _ConfirmWin16Lock    (KERNEL32.96)
 189  */
 190 DWORD WINAPI _ConfirmWin16Lock(void)
 191 {
 192     return _ConfirmSysLevel(&Win16Mutex);
 193 }
 194
 195 /************************************************************************
 196  *           ReleaseThunkLock    (KERNEL32.48)
 197  */
 198 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 199 {
 200     DWORD count = _ConfirmSysLevel(&Win16Mutex);
 201     *mutex_count = count;
 202
 203     while (count-- > 0)
 204         _LeaveSysLevel(&Win16Mutex);
 205 }
 206
 207 /************************************************************************
 208  *           RestoreThunkLock    (KERNEL32.49)
 209  */
 210 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 211 {
 212     while (mutex_count-- > 0)
 213         _EnterSysLevel(&Win16Mutex);
 214 }
 215
 216 /************************************************************************
 217  *           SYSLEVEL_CheckNotLevel
 218  */
 219 VOID SYSLEVEL_CheckNotLevel( INT level )
 220 {
 221     INT i;
 222
 223     for ( i = 3; i >= level; i-- )
 224         if ( NtCurrentTeb()->sys_count[i] > 0 )
 225         {
 226             ERR("(%d): Holding lock of level %d!\n",
 227                        level, i );
 228             DbgBreakPoint();
 229             break;
 230         }
 231 }