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 "config.h"
  22
  23 #ifdef HAVE_UNISTD_H
  24 # include <unistd.h>
  25 #endif
  26 #include <sys/types.h>
  27 #include "winternl.h"
  28 #include "syslevel.h"
  29 #include "stackframe.h"
  30 #include "wine/library.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(win32);
  34
  35 static SYSLEVEL Win16Mutex = { CRITICAL_SECTION_INIT("Win16Mutex"), 1 };
  36
  37 /* Global variable to save current TEB while in 16-bit code */
  38 WORD SYSLEVEL_Win16CurrentTeb = 0;
  39
  40
  41 /************************************************************************
  42  *           GetpWin16Lock    (KERNEL32.93)
  43  */
  44 VOID WINAPI GetpWin16Lock(SYSLEVEL **lock)
  45 {
  46     *lock = &Win16Mutex;
  47 }
  48
  49 /************************************************************************
  50  *           GetpWin16Lock    (KERNEL.449)
  51  */
  52 SEGPTR WINAPI GetpWin16Lock16(void)
  53 {
  54     static SYSLEVEL *w16Mutex;
  55     static SEGPTR segpWin16Mutex;
  56
  57     if (!segpWin16Mutex)
  58     {
  59         w16Mutex = &Win16Mutex;
  60         segpWin16Mutex = MapLS( &w16Mutex );
  61     }
  62     return segpWin16Mutex;
  63 }
  64
  65 /************************************************************************
  66  *           _CreateSysLevel    (KERNEL.438)
  67  */
  68 VOID WINAPI _CreateSysLevel(SYSLEVEL *lock, INT level)
  69 {
  70     InitializeCriticalSection( &lock->crst );
  71     lock->level = level;
  72
  73     TRACE("(%p, %d): handle is %d\n",
  74                   lock, level, lock->crst.LockSemaphore );
  75 }
  76
  77 /************************************************************************
  78  *           _EnterSysLevel    (KERNEL32.97)
  79  *           _EnterSysLevel    (KERNEL.439)
  80  */
  81 VOID WINAPI _EnterSysLevel(SYSLEVEL *lock)
  82 {
  83     TEB *teb = NtCurrentTeb();
  84     int i;
  85
  86     TRACE("(%p, level %d): thread %lx (fs %04x, pid %ld) count before %ld\n",
  87                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
  88                   teb->sys_count[lock->level] );
  89
  90     for ( i = 3; i > lock->level; i-- )
  91         if ( teb->sys_count[i] > 0 )
  92         {
  93             ERR("(%p, level %d): Holding %p, level %d. Expect deadlock!\n",
  94                         lock, lock->level, teb->sys_mutex[i], i );
  95         }
  96
  97     EnterCriticalSection( &lock->crst );
  98
  99     teb->sys_count[lock->level]++;
 100     teb->sys_mutex[lock->level] = lock;
 101
 102     TRACE("(%p, level %d): thread %lx (fs %04x, pid %ld) count after  %ld\n",
 103                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 104                   teb->sys_count[lock->level] );
 105
 106     if (lock == &Win16Mutex)
 107         SYSLEVEL_Win16CurrentTeb = wine_get_fs();
 108 }
 109
 110 /************************************************************************
 111  *           _LeaveSysLevel    (KERNEL32.98)
 112  *           _LeaveSysLevel    (KERNEL.440)
 113  */
 114 VOID WINAPI _LeaveSysLevel(SYSLEVEL *lock)
 115 {
 116     TEB *teb = NtCurrentTeb();
 117
 118     TRACE("(%p, level %d): thread %lx (fs %04x, pid %ld) count before %ld\n",
 119                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 120                   teb->sys_count[lock->level] );
 121
 122     if ( teb->sys_count[lock->level] <= 0 || teb->sys_mutex[lock->level] != lock )
 123     {
 124         ERR("(%p, level %d): Invalid state: count %ld mutex %p.\n",
 125                     lock, lock->level, teb->sys_count[lock->level],
 126                     teb->sys_mutex[lock->level] );
 127     }
 128     else
 129     {
 130         if ( --teb->sys_count[lock->level] == 0 )
 131             teb->sys_mutex[lock->level] = NULL;
 132     }
 133
 134     LeaveCriticalSection( &lock->crst );
 135
 136     TRACE("(%p, level %d): thread %lx (fs %04x, pid %ld) count after  %ld\n",
 137                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 138                   teb->sys_count[lock->level] );
 139 }
 140
 141 /************************************************************************
 142  *              @ (KERNEL32.86)
 143  */
 144 VOID WINAPI _KERNEL32_86(SYSLEVEL *lock)
 145 {
 146     _LeaveSysLevel(lock);
 147 }
 148
 149 /************************************************************************
 150  *           _ConfirmSysLevel    (KERNEL32.95)
 151  *           _ConfirmSysLevel    (KERNEL.436)
 152  */
 153 DWORD WINAPI _ConfirmSysLevel(SYSLEVEL *lock)
 154 {
 155     if ( lock && lock->crst.OwningThread == (HANDLE)GetCurrentThreadId() )
 156         return lock->crst.RecursionCount;
 157     else
 158         return 0L;
 159 }
 160
 161 /************************************************************************
 162  *           _CheckNotSysLevel    (KERNEL32.94)
 163  *           _CheckNotSysLevel    (KERNEL.437)
 164  */
 165 VOID WINAPI _CheckNotSysLevel(SYSLEVEL *lock)
 166 {
 167     if (lock && lock->crst.OwningThread == (HANDLE)GetCurrentThreadId() &&
 168         lock->crst.RecursionCount)
 169     {
 170         ERR( "Holding lock %p level %d\n", lock, lock->level );
 171         DbgBreakPoint();
 172     }
 173 }
 174
 175
 176 /************************************************************************
 177  *           _EnterWin16Lock                    [KERNEL.480]
 178  */
 179 VOID WINAPI _EnterWin16Lock(void)
 180 {
 181     _EnterSysLevel(&Win16Mutex);
 182 }
 183
 184 /************************************************************************
 185  *           _LeaveWin16Lock            [KERNEL.481]
 186  */
 187 VOID WINAPI _LeaveWin16Lock(void)
 188 {
 189     _LeaveSysLevel(&Win16Mutex);
 190 }
 191
 192 /************************************************************************
 193  *           _ConfirmWin16Lock    (KERNEL32.96)
 194  */
 195 DWORD WINAPI _ConfirmWin16Lock(void)
 196 {
 197     return _ConfirmSysLevel(&Win16Mutex);
 198 }
 199
 200 /************************************************************************
 201  *           ReleaseThunkLock    (KERNEL32.48)
 202  */
 203 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 204 {
 205     DWORD count = _ConfirmSysLevel(&Win16Mutex);
 206     *mutex_count = count;
 207
 208     while (count-- > 0)
 209         _LeaveSysLevel(&Win16Mutex);
 210 }
 211
 212 /************************************************************************
 213  *           RestoreThunkLock    (KERNEL32.49)
 214  */
 215 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 216 {
 217     while (mutex_count-- > 0)
 218         _EnterSysLevel(&Win16Mutex);
 219 }
 220
 221 /************************************************************************
 222  *           SYSLEVEL_CheckNotLevel
 223  */
 224 VOID SYSLEVEL_CheckNotLevel( INT level )
 225 {
 226     INT i;
 227
 228     for ( i = 3; i >= level; i-- )
 229         if ( NtCurrentTeb()->sys_count[i] > 0 )
 230         {
 231             ERR("(%d): Holding lock of level %d!\n",
 232                        level, i );
 233             DbgBreakPoint();
 234             break;
 235         }
 236 }