scheduler/syslevel.c

   1 /*
   2  * Win32 'syslevel' routines
   3  *
   4  * Copyright 1998 Ulrich Weigand
   5  */
   6
   7 #include <unistd.h>
   8 #include <sys/types.h>
   9 #include "ntddk.h"
  10 #include "syslevel.h"
  11 #include "stackframe.h"
  12 #include "debugtools.h"
  13
  14 DEFAULT_DEBUG_CHANNEL(win32);
  15
  16 static SYSLEVEL Win16Mutex = { CRITICAL_SECTION_INIT("Win16Mutex"), 1 };
  17
  18 /* Global variable to save current TEB while in 16-bit code */
  19 WORD SYSLEVEL_Win16CurrentTeb = 0;
  20
  21
  22 /************************************************************************
  23  *           GetpWin16Lock    (KERNEL32.93)
  24  */
  25 VOID WINAPI GetpWin16Lock(SYSLEVEL **lock)
  26 {
  27     *lock = &Win16Mutex;
  28 }
  29
  30 /************************************************************************
  31  *           GetpWin16Lock    (KERNEL.449)
  32  */
  33 SEGPTR WINAPI GetpWin16Lock16(void)
  34 {
  35     static SYSLEVEL *w16Mutex;
  36     static SEGPTR segpWin16Mutex;
  37
  38     if (!segpWin16Mutex)
  39     {
  40         w16Mutex = &Win16Mutex;
  41         segpWin16Mutex = MapLS( &w16Mutex );
  42     }
  43     return segpWin16Mutex;
  44 }
  45
  46 /************************************************************************
  47  *           _CreateSysLevel    (KERNEL.438)
  48  */
  49 VOID WINAPI _CreateSysLevel(SYSLEVEL *lock, INT level)
  50 {
  51     InitializeCriticalSection( &lock->crst );
  52     lock->level = level;
  53
  54     TRACE("(%p, %d): handle is %d\n",
  55                   lock, level, lock->crst.LockSemaphore );
  56 }
  57
  58 /************************************************************************
  59  *           _EnterSysLevel    (KERNEL32.97)
  60  *           _EnterSysLevel    (KERNEL.439)
  61  */
  62 VOID WINAPI _EnterSysLevel(SYSLEVEL *lock)
  63 {
  64     TEB *teb = NtCurrentTeb();
  65     int i;
  66
  67     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count before %ld\n",
  68                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
  69                   teb->sys_count[lock->level] );
  70
  71     for ( i = 3; i > lock->level; i-- )
  72         if ( teb->sys_count[i] > 0 )
  73         {
  74             ERR("(%p, level %d): Holding %p, level %d. Expect deadlock!\n",
  75                         lock, lock->level, teb->sys_mutex[i], i );
  76         }
  77
  78     EnterCriticalSection( &lock->crst );
  79
  80     teb->sys_count[lock->level]++;
  81     teb->sys_mutex[lock->level] = lock;
  82
  83     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count after  %ld\n",
  84                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
  85                   teb->sys_count[lock->level] );
  86
  87     if (lock == &Win16Mutex)
  88         SYSLEVEL_Win16CurrentTeb = __get_fs();
  89 }
  90
  91 /************************************************************************
  92  *           _LeaveSysLevel    (KERNEL32.98)
  93  *           _LeaveSysLevel    (KERNEL.440)
  94  */
  95 VOID WINAPI _LeaveSysLevel(SYSLEVEL *lock)
  96 {
  97     TEB *teb = NtCurrentTeb();
  98
  99     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count before %ld\n",
 100                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 101                   teb->sys_count[lock->level] );
 102
 103     if ( teb->sys_count[lock->level] <= 0 || teb->sys_mutex[lock->level] != lock )
 104     {
 105         ERR("(%p, level %d): Invalid state: count %ld mutex %p.\n",
 106                     lock, lock->level, teb->sys_count[lock->level],
 107                     teb->sys_mutex[lock->level] );
 108     }
 109     else
 110     {
 111         if ( --teb->sys_count[lock->level] == 0 )
 112             teb->sys_mutex[lock->level] = NULL;
 113     }
 114
 115     LeaveCriticalSection( &lock->crst );
 116
 117     TRACE("(%p, level %d): thread %p (fs %04x, pid %ld) count after  %ld\n",
 118                   lock, lock->level, teb->tid, teb->teb_sel, (long) getpid(),
 119                   teb->sys_count[lock->level] );
 120 }
 121
 122 /************************************************************************
 123  *              @ (KERNEL32.86)
 124  */
 125 VOID WINAPI _KERNEL32_86(SYSLEVEL *lock)
 126 {
 127     _LeaveSysLevel(lock);
 128 }
 129
 130 /************************************************************************
 131  *           _ConfirmSysLevel    (KERNEL32.95)
 132  *           _ConfirmSysLevel    (KERNEL.436)
 133  */
 134 DWORD WINAPI _ConfirmSysLevel(SYSLEVEL *lock)
 135 {
 136     if ( lock && lock->crst.OwningThread == GetCurrentThreadId() )
 137         return lock->crst.RecursionCount;
 138     else
 139         return 0L;
 140 }
 141
 142 /************************************************************************
 143  *           _CheckNotSysLevel    (KERNEL32.94)
 144  *           _CheckNotSysLevel    (KERNEL.437)
 145  */
 146 VOID WINAPI _CheckNotSysLevel(SYSLEVEL *lock)
 147 {
 148     if (lock && lock->crst.OwningThread == GetCurrentThreadId() && lock->crst.RecursionCount)
 149     {
 150         ERR( "Holding lock %p level %d\n", lock, lock->level );
 151         DbgBreakPoint();
 152     }
 153 }
 154
 155
 156 /************************************************************************
 157  *           _EnterWin16Lock                    [KERNEL.480]
 158  */
 159 VOID WINAPI _EnterWin16Lock(void)
 160 {
 161     _EnterSysLevel(&Win16Mutex);
 162 }
 163
 164 /************************************************************************
 165  *           _LeaveWin16Lock            [KERNEL.481]
 166  */
 167 VOID WINAPI _LeaveWin16Lock(void)
 168 {
 169     _LeaveSysLevel(&Win16Mutex);
 170 }
 171
 172 /************************************************************************
 173  *           _ConfirmWin16Lock    (KERNEL32.96)
 174  */
 175 DWORD WINAPI _ConfirmWin16Lock(void)
 176 {
 177     return _ConfirmSysLevel(&Win16Mutex);
 178 }
 179
 180 /************************************************************************
 181  *           ReleaseThunkLock    (KERNEL32.48)
 182  */
 183 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 184 {
 185     DWORD count = _ConfirmSysLevel(&Win16Mutex);
 186     *mutex_count = count;
 187
 188     while (count-- > 0)
 189         _LeaveSysLevel(&Win16Mutex);
 190 }
 191
 192 /************************************************************************
 193  *           RestoreThunkLock    (KERNEL32.49)
 194  */
 195 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 196 {
 197     while (mutex_count-- > 0)
 198         _EnterSysLevel(&Win16Mutex);
 199 }
 200
 201 /************************************************************************
 202  *           SYSLEVEL_CheckNotLevel
 203  */
 204 VOID SYSLEVEL_CheckNotLevel( INT level )
 205 {
 206     INT i;
 207
 208     for ( i = 3; i >= level; i-- )
 209         if ( NtCurrentTeb()->sys_count[i] > 0 )
 210         {
 211             ERR("(%d): Holding lock of level %d!\n",
 212                        level, i );
 213             DbgBreakPoint();
 214             break;
 215         }
 216 }