scheduler/syslevel.c

   1 /*
   2  * Win32 'syslevel' routines
   3  *
   4  * Copyright 1998 Ulrich Weigand
   5  */
   6
   7 #include <unistd.h>
   8 #include "syslevel.h"
   9 #include "heap.h"
  10 #include "stackframe.h"
  11 #include "debug.h"
  12
  13 static CRITICAL_SECTION Win16Mutex;
  14 static SEGPTR segpWin16Mutex;
  15
  16 /* Global variable to save current TEB while in 16-bit code */
  17 WORD SYSLEVEL_Win16CurrentTeb = 0;
  18
  19 /* TEB of initial process for emergency use */
  20 WORD SYSLEVEL_EmergencyTeb = 0;
  21
  22
  23 /************************************************************************
  24  *           SYSLEVEL_Init
  25  */
  26 void SYSLEVEL_Init(void)
  27 {
  28     CRITICAL_SECTION **w16Mutex = SEGPTR_ALLOC(sizeof(CRITICAL_SECTION *));
  29
  30     *w16Mutex = &Win16Mutex;
  31     segpWin16Mutex = SEGPTR_GET(w16Mutex);
  32
  33     InitializeCriticalSection(&Win16Mutex);
  34     MakeCriticalSectionGlobal(&Win16Mutex);
  35 }
  36
  37 /************************************************************************
  38  *           GetpWin16Lock32    (KERNEL32.93)
  39  */
  40 VOID WINAPI GetpWin16Lock(CRITICAL_SECTION **lock)
  41 {
  42     *lock = &Win16Mutex;
  43 }
  44
  45 /************************************************************************
  46  *           GetpWin16Lock16    (KERNEL.449)
  47  */
  48 SEGPTR WINAPI GetpWin16Lock16(void)
  49 {
  50     return segpWin16Mutex;
  51 }
  52
  53 /************************************************************************
  54  *           _EnterSysLevel    (KERNEL32.97)
  55  */
  56 VOID WINAPI _EnterSysLevel(CRITICAL_SECTION *lock)
  57 {
  58     EnterCriticalSection(lock);
  59
  60     if (lock == &Win16Mutex)
  61         GET_FS( SYSLEVEL_Win16CurrentTeb );
  62 }
  63
  64 /************************************************************************
  65  *           _LeaveSysLevel    (KERNEL32.98)
  66  */
  67 VOID WINAPI _LeaveSysLevel(CRITICAL_SECTION *lock)
  68 {
  69     LeaveCriticalSection(lock);
  70 }
  71
  72 /************************************************************************
  73  *           (KERNEL32.86)
  74  */
  75 VOID WINAPI _KERNEL32_86(CRITICAL_SECTION *lock)
  76 {
  77     _LeaveSysLevel(lock);
  78 }
  79
  80 /************************************************************************
  81  *           SYSLEVEL_EnterWin16Lock                    [KERNEL.480]
  82  */
  83 VOID WINAPI SYSLEVEL_EnterWin16Lock(VOID)
  84 {
  85     TRACE(win32, "thread %04x (pid %d) about to enter\n",
  86           THREAD_Current()->teb_sel, getpid());
  87
  88     _EnterSysLevel(&Win16Mutex);
  89
  90     TRACE(win32, "thread %04x (pid %d) entered, count is %ld\n",
  91           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
  92 }
  93
  94 /************************************************************************
  95  *           SYSLEVEL_LeaveWin16Lock            [KERNEL.481]
  96  */
  97 VOID WINAPI SYSLEVEL_LeaveWin16Lock(VOID)
  98 {
  99     TRACE(win32, "thread %04x (pid %d) about to leave, count is %ld\n",
 100           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
 101
 102     _LeaveSysLevel(&Win16Mutex);
 103 }
 104
 105 /************************************************************************
 106  *           _CheckNotSysLevel    (KERNEL32.94)
 107  */
 108 VOID WINAPI _CheckNotSysLevel(CRITICAL_SECTION *lock)
 109 {
 110     FIXME(win32, "()\n");
 111 }
 112
 113 /************************************************************************
 114  *           _ConfirmSysLevel    (KERNEL32.95)
 115  */
 116 VOID WINAPI _ConfirmSysLevel(CRITICAL_SECTION *lock)
 117 {
 118     FIXME(win32, "()\n");
 119 }
 120
 121 /************************************************************************
 122  *           _ConfirmWin16Lock    (KERNEL32.96)
 123  */
 124 DWORD WINAPI _ConfirmWin16Lock(void)
 125 {
 126     if ( Win16Mutex.OwningThread == GetCurrentThreadId() )
 127         return Win16Mutex.RecursionCount;
 128     else
 129         return 0L;
 130 }
 131
 132 /************************************************************************
 133  *           ReleaseThunkLock    (KERNEL32.48)
 134  */
 135 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 136 {
 137     DWORD count = Win16Mutex.RecursionCount;
 138     *mutex_count = count;
 139
 140     while (count-- > 0)
 141         _LeaveSysLevel(&Win16Mutex);
 142 }
 143
 144 /************************************************************************
 145  *           RestoreThunkLock    (KERNEL32.49)
 146  */
 147 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 148 {
 149     while (mutex_count-- > 0)
 150         _EnterSysLevel(&Win16Mutex);
 151 }
 152
 153 /************************************************************************
 154  *           SYSLEVEL_ReleaseWin16Lock
 155  */
 156 VOID SYSLEVEL_ReleaseWin16Lock(VOID)
 157 {
 158     DWORD count;
 159
 160     TRACE(win32, "thread %04x (pid %d) about to release, count is %ld\n",
 161           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
 162
 163     ReleaseThunkLock(&count);
 164
 165     if (count > 0xffff)
 166         ERR(win32, "Win16Mutex recursion count too large!\n");
 167
 168     CURRENT_STACK16->mutex_count = (WORD)count;
 169 }
 170
 171 /************************************************************************
 172  *           SYSLEVEL_RestoreWin16Lock
 173  */
 174 VOID SYSLEVEL_RestoreWin16Lock(VOID)
 175 {
 176     DWORD count = CURRENT_STACK16->mutex_count;
 177
 178     if (!count)
 179         ERR(win32, "Win16Mutex recursion count is zero!\n");
 180
 181     TRACE(win32, "thread %04x (pid %d) about to restore (count %ld)\n",
 182           THREAD_Current()->teb_sel, getpid(), count);
 183
 184     RestoreThunkLock(count);
 185
 186     TRACE(win32, "thread %04x (pid %d) restored lock, count is %ld\n",
 187           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
 188 }
 189