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 "winreg.h"
  31 #include "winternl.h"
  32 #include "wine/winbase16.h"
  33 #include "thread.h"
  34 #include "kernel_private.h"
  35 #include "wine/library.h"
  36 #include "wine/debug.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(win32);
  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 /* Global variable to save current TEB while in 16-bit code */
  50 extern WORD SYSLEVEL_Win16CurrentTeb;
  51
  52
  53 /************************************************************************
  54  *           GetpWin16Lock    (KERNEL32.93)
  55  */
  56 VOID WINAPI GetpWin16Lock(SYSLEVEL **lock)
  57 {
  58     *lock = &Win16Mutex;
  59 }
  60
  61 /************************************************************************
  62  *           GetpWin16Lock    (KERNEL.449)
  63  */
  64 SEGPTR WINAPI GetpWin16Lock16(void)
  65 {
  66     static SYSLEVEL *w16Mutex;
  67     static SEGPTR segpWin16Mutex;
  68
  69     if (!segpWin16Mutex)
  70     {
  71         w16Mutex = &Win16Mutex;
  72         segpWin16Mutex = MapLS( &w16Mutex );
  73     }
  74     return segpWin16Mutex;
  75 }
  76
  77 /************************************************************************
  78  *           _CreateSysLevel    (KERNEL.438)
  79  */
  80 VOID WINAPI _CreateSysLevel(SYSLEVEL *lock, INT level)
  81 {
  82     RtlInitializeCriticalSection( &lock->crst );
  83     lock->level = level;
  84
  85     TRACE("(%p, %d): handle is %p\n",
  86                   lock, level, lock->crst.LockSemaphore );
  87 }
  88
  89 /************************************************************************
  90  *           _EnterSysLevel    (KERNEL32.97)
  91  *           _EnterSysLevel    (KERNEL.439)
  92  */
  93 VOID WINAPI _EnterSysLevel(SYSLEVEL *lock)
  94 {
  95     TEB *teb = NtCurrentTeb();
  96     int i;
  97
  98     TRACE("(%p, level %d): thread %lx count before %ld\n",
  99           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 100
 101     for ( i = 3; i > lock->level; i-- )
 102         if ( teb->sys_count[i] > 0 )
 103         {
 104             ERR("(%p, level %d): Holding %p, level %d. Expect deadlock!\n",
 105                         lock, lock->level, teb->sys_mutex[i], i );
 106         }
 107
 108     RtlEnterCriticalSection( &lock->crst );
 109
 110     teb->sys_count[lock->level]++;
 111     teb->sys_mutex[lock->level] = lock;
 112
 113     TRACE("(%p, level %d): thread %lx count after  %ld\n",
 114           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 115
 116 #ifdef __i386__
 117     if (lock == &Win16Mutex) SYSLEVEL_Win16CurrentTeb = wine_get_fs();
 118 #endif
 119 }
 120
 121 /************************************************************************
 122  *           _LeaveSysLevel    (KERNEL32.98)
 123  *           _LeaveSysLevel    (KERNEL.440)
 124  */
 125 VOID WINAPI _LeaveSysLevel(SYSLEVEL *lock)
 126 {
 127     TEB *teb = NtCurrentTeb();
 128
 129     TRACE("(%p, level %d): thread %lx count before %ld\n",
 130           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 131
 132     if ( teb->sys_count[lock->level] <= 0 || teb->sys_mutex[lock->level] != lock )
 133     {
 134         ERR("(%p, level %d): Invalid state: count %ld mutex %p.\n",
 135                     lock, lock->level, teb->sys_count[lock->level],
 136                     teb->sys_mutex[lock->level] );
 137     }
 138     else
 139     {
 140         if ( --teb->sys_count[lock->level] == 0 )
 141             teb->sys_mutex[lock->level] = NULL;
 142     }
 143
 144     RtlLeaveCriticalSection( &lock->crst );
 145
 146     TRACE("(%p, level %d): thread %lx count after  %ld\n",
 147           lock, lock->level, GetCurrentThreadId(), teb->sys_count[lock->level] );
 148 }
 149
 150 /************************************************************************
 151  *              @ (KERNEL32.86)
 152  */
 153 VOID WINAPI _KERNEL32_86(SYSLEVEL *lock)
 154 {
 155     _LeaveSysLevel(lock);
 156 }
 157
 158 /************************************************************************
 159  *           _ConfirmSysLevel    (KERNEL32.95)
 160  *           _ConfirmSysLevel    (KERNEL.436)
 161  */
 162 DWORD WINAPI _ConfirmSysLevel(SYSLEVEL *lock)
 163 {
 164     if ( lock && lock->crst.OwningThread == (HANDLE)GetCurrentThreadId() )
 165         return lock->crst.RecursionCount;
 166     else
 167         return 0L;
 168 }
 169
 170 /************************************************************************
 171  *           _CheckNotSysLevel    (KERNEL32.94)
 172  *           _CheckNotSysLevel    (KERNEL.437)
 173  */
 174 VOID WINAPI _CheckNotSysLevel(SYSLEVEL *lock)
 175 {
 176     if (lock && lock->crst.OwningThread == (HANDLE)GetCurrentThreadId() &&
 177         lock->crst.RecursionCount)
 178     {
 179         ERR( "Holding lock %p level %d\n", lock, lock->level );
 180         DbgBreakPoint();
 181     }
 182 }
 183
 184
 185 /************************************************************************
 186  *           _EnterWin16Lock                    [KERNEL.480]
 187  */
 188 VOID WINAPI _EnterWin16Lock(void)
 189 {
 190     _EnterSysLevel(&Win16Mutex);
 191 }
 192
 193 /************************************************************************
 194  *           _LeaveWin16Lock            [KERNEL.481]
 195  */
 196 VOID WINAPI _LeaveWin16Lock(void)
 197 {
 198     _LeaveSysLevel(&Win16Mutex);
 199 }
 200
 201 /************************************************************************
 202  *           _ConfirmWin16Lock    (KERNEL32.96)
 203  */
 204 DWORD WINAPI _ConfirmWin16Lock(void)
 205 {
 206     return _ConfirmSysLevel(&Win16Mutex);
 207 }
 208
 209 /************************************************************************
 210  *           ReleaseThunkLock    (KERNEL32.48)
 211  */
 212 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 213 {
 214     DWORD count = _ConfirmSysLevel(&Win16Mutex);
 215     *mutex_count = count;
 216
 217     while (count-- > 0)
 218         _LeaveSysLevel(&Win16Mutex);
 219 }
 220
 221 /************************************************************************
 222  *           RestoreThunkLock    (KERNEL32.49)
 223  */
 224 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 225 {
 226     while (mutex_count-- > 0)
 227         _EnterSysLevel(&Win16Mutex);
 228 }
 229
 230 /************************************************************************
 231  *           SYSLEVEL_CheckNotLevel
 232  */
 233 VOID SYSLEVEL_CheckNotLevel( INT level )
 234 {
 235     INT i;
 236
 237     for ( i = 3; i >= level; i-- )
 238         if ( NtCurrentTeb()->sys_count[i] > 0 )
 239         {
 240             ERR("(%d): Holding lock of level %d!\n",
 241                        level, i );
 242             DbgBreakPoint();
 243             break;
 244         }
 245 }