dlls/kernel/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 #include <stdarg.h>
  24 #ifdef HAVE_UNISTD_H
  25 # include <unistd.h>
  26 #endif
  27 #include <sys/types.h>
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "thread.h"
  31 #include "winreg.h"
  32 #include "winternl.h"
  33 #include "wine/winbase16.h"
  34 #include "kernel_private.h"
  35 #include "wine/library.h"
  36 #include "wine/debug.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(syslevel);
  39
  40 static SYSLEVEL Win16Mutex;
  41 static CRITICAL_SECTION_DEBUG critsect_debug =
  42 {
  43     0, 0, &Win16Mutex.crst,
  44     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  45       0, 0, { 0, (DWORD)(__FILE__ ": Win16Mutex") }
  46 };
  47 static SYSLEVEL Win16Mutex = { { &critsect_debug, -1, 0, 0, 0, 0 }, 1 };
  48
  49 #ifdef __i386__
  50 extern unsigned int CallTo16_TebSelector;
  51 #endif
  52
  53
  54 /************************************************************************
  55  *           GetpWin16Lock    (KERNEL32.93)
  56  */
  57 VOID WINAPI GetpWin16Lock(SYSLEVEL **lock)
  58 {
  59     *lock = &Win16Mutex;
  60 }
  61
  62 /************************************************************************
  63  *           GetpWin16Lock    (KERNEL.449)
  64  */
  65 SEGPTR WINAPI GetpWin16Lock16(void)
  66 {
  67     static SYSLEVEL *w16Mutex;
  68     static SEGPTR segpWin16Mutex;
  69
  70     if (!segpWin16Mutex)
  71     {
  72         w16Mutex = &Win16Mutex;
  73         segpWin16Mutex = MapLS( &w16Mutex );
  74     }
  75     return segpWin16Mutex;
  76 }
  77
  78 /************************************************************************
  79  *           _CreateSysLevel    (KERNEL.438)
  80  */
  81 VOID WINAPI _CreateSysLevel(SYSLEVEL *lock, INT level)
  82 {
  83     RtlInitializeCriticalSection( &lock->crst );
  84     lock->level = level;
  85
  86     TRACE("(%p, %d): handle is %p\n",
  87                   lock, level, lock->crst.LockSemaphore );
  88 }
  89
  90 /************************************************************************
  91  *           _EnterSysLevel    (KERNEL32.97)
  92  *           _EnterSysLevel    (KERNEL.439)
  93  */
  94 VOID WINAPI _EnterSysLevel(SYSLEVEL *lock)
  95 {
  96     TEB *teb = NtCurrentTeb();
  97     int i;
  98
  99     TRACE("(%p, level %d): thread %lx count before %ld\n",
 100           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 101
 102     for ( i = 3; i > lock->level; i-- )
 103         if ( teb->sys_count[i] > 0 )
 104         {
 105             ERR("(%p, level %d): Holding %p, level %d. Expect deadlock!\n",
 106                         lock, lock->level, teb->sys_mutex[i], i );
 107         }
 108
 109     RtlEnterCriticalSection( &lock->crst );
 110
 111     teb->sys_count[lock->level]++;
 112     teb->sys_mutex[lock->level] = lock;
 113
 114     TRACE("(%p, level %d): thread %lx count after  %ld\n",
 115           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 116
 117 #ifdef __i386__
 118     if (lock == &Win16Mutex) CallTo16_TebSelector = wine_get_fs();
 119 #endif
 120 }
 121
 122 /************************************************************************
 123  *           _LeaveSysLevel    (KERNEL32.98)
 124  *           _LeaveSysLevel    (KERNEL.440)
 125  */
 126 VOID WINAPI _LeaveSysLevel(SYSLEVEL *lock)
 127 {
 128     TEB *teb = NtCurrentTeb();
 129
 130     TRACE("(%p, level %d): thread %lx count before %ld\n",
 131           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 132
 133     if ( teb->sys_count[lock->level] <= 0 || teb->sys_mutex[lock->level] != lock )
 134     {
 135         ERR("(%p, level %d): Invalid state: count %ld mutex %p.\n",
 136                     lock, lock->level, teb->sys_count[lock->level],
 137                     teb->sys_mutex[lock->level] );
 138     }
 139     else
 140     {
 141         if ( --teb->sys_count[lock->level] == 0 )
 142             teb->sys_mutex[lock->level] = NULL;
 143     }
 144
 145     RtlLeaveCriticalSection( &lock->crst );
 146
 147     TRACE("(%p, level %d): thread %lx count after  %ld\n",
 148           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 149 }
 150
 151 /************************************************************************
 152  *              @ (KERNEL32.86)
 153  */
 154 VOID WINAPI _KERNEL32_86(SYSLEVEL *lock)
 155 {
 156     _LeaveSysLevel(lock);
 157 }
 158
 159 /************************************************************************
 160  *           _ConfirmSysLevel    (KERNEL32.95)
 161  *           _ConfirmSysLevel    (KERNEL.436)
 162  */
 163 DWORD WINAPI _ConfirmSysLevel(SYSLEVEL *lock)
 164 {
 165     if ( lock && lock->crst.OwningThread == (HANDLE)GetCurrentThreadId() )
 166         return lock->crst.RecursionCount;
 167     else
 168         return 0L;
 169 }
 170
 171 /************************************************************************
 172  *           _CheckNotSysLevel    (KERNEL32.94)
 173  *           _CheckNotSysLevel    (KERNEL.437)
 174  */
 175 VOID WINAPI _CheckNotSysLevel(SYSLEVEL *lock)
 176 {
 177     if (lock && lock->crst.OwningThread == (HANDLE)GetCurrentThreadId() &&
 178         lock->crst.RecursionCount)
 179     {
 180         ERR( "Holding lock %p level %d\n", lock, lock->level );
 181         DbgBreakPoint();
 182     }
 183 }
 184
 185
 186 /************************************************************************
 187  *           _EnterWin16Lock                    [KERNEL.480]
 188  */
 189 VOID WINAPI _EnterWin16Lock(void)
 190 {
 191     _EnterSysLevel(&Win16Mutex);
 192 }
 193
 194 /************************************************************************
 195  *           _LeaveWin16Lock            [KERNEL.481]
 196  */
 197 VOID WINAPI _LeaveWin16Lock(void)
 198 {
 199     _LeaveSysLevel(&Win16Mutex);
 200 }
 201
 202 /************************************************************************
 203  *           _ConfirmWin16Lock    (KERNEL32.96)
 204  */
 205 DWORD WINAPI _ConfirmWin16Lock(void)
 206 {
 207     return _ConfirmSysLevel(&Win16Mutex);
 208 }
 209
 210 /************************************************************************
 211  *           ReleaseThunkLock    (KERNEL32.48)
 212  */
 213 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 214 {
 215     DWORD count = _ConfirmSysLevel(&Win16Mutex);
 216     *mutex_count = count;
 217
 218     while (count-- > 0)
 219         _LeaveSysLevel(&Win16Mutex);
 220 }
 221
 222 /************************************************************************
 223  *           RestoreThunkLock    (KERNEL32.49)
 224  */
 225 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 226 {
 227     while (mutex_count-- > 0)
 228         _EnterSysLevel(&Win16Mutex);
 229 }
 230
 231 /************************************************************************
 232  *           SYSLEVEL_CheckNotLevel
 233  */
 234 VOID SYSLEVEL_CheckNotLevel( INT level )
 235 {
 236     INT i;
 237
 238     for ( i = 3; i >= level; i-- )
 239         if ( NtCurrentTeb()->sys_count[i] > 0 )
 240         {
 241             ERR("(%d): Holding lock of level %d!\n",
 242                        level, i );
 243             DbgBreakPoint();
 244             break;
 245         }
 246 }