dlls/krnl386.exe16/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdarg.h>
  22 #include <sys/types.h>
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "winternl.h"
  27 #include "wine/winbase16.h"
  28 #include "kernel16_private.h"
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(syslevel);
  32
  33 static SYSLEVEL Win16Mutex;
  34 static CRITICAL_SECTION_DEBUG critsect_debug =
  35 {
  36     0, 0, &Win16Mutex.crst,
  37     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  38       0, 0, { (DWORD_PTR)(__FILE__ ": Win16Mutex") }
  39 };
  40 static SYSLEVEL Win16Mutex = { { &critsect_debug, -1, 0, 0, 0, 0 }, 1 };
  41
  42
  43 /************************************************************************
  44  *           GetpWin16Lock    (KERNEL32.93)
  45  */
  46 VOID WINAPI GetpWin16Lock(SYSLEVEL **lock)
  47 {
  48     *lock = &Win16Mutex;
  49 }
  50
  51 /************************************************************************
  52  *           GetpWin16Lock    (KERNEL.449)
  53  */
  54 SEGPTR WINAPI GetpWin16Lock16(void)
  55 {
  56     static SYSLEVEL *w16Mutex;
  57     static SEGPTR segpWin16Mutex;
  58
  59     if (!segpWin16Mutex)
  60     {
  61         w16Mutex = &Win16Mutex;
  62         segpWin16Mutex = MapLS( &w16Mutex );
  63     }
  64     return segpWin16Mutex;
  65 }
  66
  67 /************************************************************************
  68  *           _CreateSysLevel    (KERNEL.438)
  69  */
  70 VOID WINAPI _CreateSysLevel(SYSLEVEL *lock, INT level)
  71 {
  72     RtlInitializeCriticalSection( &lock->crst );
  73     lock->level = level;
  74
  75     TRACE("(%p, %d): handle is %p\n",
  76                   lock, level, lock->crst.LockSemaphore );
  77 }
  78
  79 /************************************************************************
  80  *           _EnterSysLevel    (KERNEL32.97)
  81  *           _EnterSysLevel    (KERNEL.439)
  82  */
  83 VOID WINAPI _EnterSysLevel(SYSLEVEL *lock)
  84 {
  85     struct kernel_thread_data *thread_data = kernel_get_thread_data();
  86     int i;
  87
  88     TRACE("(%p, level %d): thread %x count before %d\n",
  89           lock, lock->level, GetCurrentThreadId(), thread_data->sys_count[lock->level] );
  90
  91     for ( i = 3; i > lock->level; i-- )
  92         if ( thread_data->sys_count[i] > 0 )
  93         {
  94             ERR("(%p, level %d): Holding %p, level %d. Expect deadlock!\n",
  95                         lock, lock->level, thread_data->sys_mutex[i], i );
  96         }
  97
  98     RtlEnterCriticalSection( &lock->crst );
  99
 100     thread_data->sys_count[lock->level]++;
 101     thread_data->sys_mutex[lock->level] = lock;
 102
 103     TRACE("(%p, level %d): thread %x count after  %d\n",
 104           lock, lock->level, GetCurrentThreadId(), thread_data->sys_count[lock->level] );
 105
 106     if (lock == &Win16Mutex) CallTo16_TebSelector = get_fs();
 107 }
 108
 109 /************************************************************************
 110  *           _LeaveSysLevel    (KERNEL32.98)
 111  *           _LeaveSysLevel    (KERNEL.440)
 112  */
 113 VOID WINAPI _LeaveSysLevel(SYSLEVEL *lock)
 114 {
 115     struct kernel_thread_data *thread_data = kernel_get_thread_data();
 116
 117     TRACE("(%p, level %d): thread %x count before %d\n",
 118           lock, lock->level, GetCurrentThreadId(), thread_data->sys_count[lock->level] );
 119
 120     if ( thread_data->sys_count[lock->level] <= 0 || thread_data->sys_mutex[lock->level] != lock )
 121     {
 122         ERR("(%p, level %d): Invalid state: count %d mutex %p.\n",
 123                     lock, lock->level, thread_data->sys_count[lock->level],
 124                     thread_data->sys_mutex[lock->level] );
 125     }
 126     else
 127     {
 128         if ( --thread_data->sys_count[lock->level] == 0 )
 129             thread_data->sys_mutex[lock->level] = NULL;
 130     }
 131
 132     RtlLeaveCriticalSection( &lock->crst );
 133
 134     TRACE("(%p, level %d): thread %x count after  %d\n",
 135           lock, lock->level, GetCurrentThreadId(), thread_data->sys_count[lock->level] );
 136 }
 137
 138 /************************************************************************
 139  *              @ (KERNEL32.86)
 140  */
 141 VOID WINAPI _KERNEL32_86(SYSLEVEL *lock)
 142 {
 143     _LeaveSysLevel(lock);
 144 }
 145
 146 /************************************************************************
 147  *           _ConfirmSysLevel    (KERNEL32.95)
 148  *           _ConfirmSysLevel    (KERNEL.436)
 149  */
 150 DWORD WINAPI _ConfirmSysLevel(SYSLEVEL *lock)
 151 {
 152     if ( lock && lock->crst.OwningThread == ULongToHandle(GetCurrentThreadId()) )
 153         return lock->crst.RecursionCount;
 154     else
 155         return 0L;
 156 }
 157
 158 /************************************************************************
 159  *           _CheckNotSysLevel    (KERNEL32.94)
 160  *           _CheckNotSysLevel    (KERNEL.437)
 161  */
 162 VOID WINAPI _CheckNotSysLevel(SYSLEVEL *lock)
 163 {
 164     if (lock && lock->crst.OwningThread == ULongToHandle(GetCurrentThreadId()) &&
 165         lock->crst.RecursionCount)
 166     {
 167         ERR( "Holding lock %p level %d\n", lock, lock->level );
 168         DbgBreakPoint();
 169     }
 170 }
 171
 172
 173 /************************************************************************
 174  *           _EnterWin16Lock                    [KERNEL.480]
 175  */
 176 VOID WINAPI _EnterWin16Lock(void)
 177 {
 178     _EnterSysLevel(&Win16Mutex);
 179 }
 180
 181 /************************************************************************
 182  *           _LeaveWin16Lock            [KERNEL.481]
 183  */
 184 VOID WINAPI _LeaveWin16Lock(void)
 185 {
 186     _LeaveSysLevel(&Win16Mutex);
 187 }
 188
 189 /************************************************************************
 190  *           _ConfirmWin16Lock    (KERNEL32.96)
 191  */
 192 DWORD WINAPI _ConfirmWin16Lock(void)
 193 {
 194     return _ConfirmSysLevel(&Win16Mutex);
 195 }
 196
 197 /************************************************************************
 198  *           ReleaseThunkLock    (KERNEL32.48)
 199  */
 200 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 201 {
 202     DWORD count = _ConfirmSysLevel(&Win16Mutex);
 203     *mutex_count = count;
 204
 205     while (count-- > 0)
 206         _LeaveSysLevel(&Win16Mutex);
 207 }
 208
 209 /************************************************************************
 210  *           RestoreThunkLock    (KERNEL32.49)
 211  */
 212 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 213 {
 214     while (mutex_count-- > 0)
 215         _EnterSysLevel(&Win16Mutex);
 216 }
 217
 218 /************************************************************************
 219  *           SYSLEVEL_CheckNotLevel
 220  */
 221 VOID SYSLEVEL_CheckNotLevel( INT level )
 222 {
 223     INT i;
 224
 225     for ( i = 3; i >= level; i-- )
 226         if ( kernel_get_thread_data()->sys_count[i] > 0 )
 227         {
 228             ERR("(%d): Holding lock of level %d!\n",
 229                        level, i );
 230             DbgBreakPoint();
 231             break;
 232         }
 233 }