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 }
  35
  36 /************************************************************************
  37  *           GetpWin16Lock32    (KERNEL32.93)
  38  */
  39 VOID WINAPI GetpWin16Lock32(CRITICAL_SECTION **lock)
  40 {
  41     *lock = &Win16Mutex;
  42 }
  43
  44 /************************************************************************
  45  *           GetpWin16Lock16    (KERNEL.449)
  46  */
  47 SEGPTR WINAPI GetpWin16Lock16(void)
  48 {
  49     return segpWin16Mutex;
  50 }
  51
  52 /************************************************************************
  53  *           _EnterSysLevel    (KERNEL32.97)
  54  */
  55 VOID WINAPI _EnterSysLevel(CRITICAL_SECTION *lock)
  56 {
  57     EnterCriticalSection(lock);
  58
  59     if (lock == &Win16Mutex)
  60         GET_FS( SYSLEVEL_Win16CurrentTeb );
  61 }
  62
  63 /************************************************************************
  64  *           _LeaveSysLevel    (KERNEL32.98)
  65  */
  66 VOID WINAPI _LeaveSysLevel(CRITICAL_SECTION *lock)
  67 {
  68     LeaveCriticalSection(lock);
  69 }
  70
  71 /************************************************************************
  72  *           (KERNEL32.86)
  73  */
  74 VOID WINAPI _KERNEL32_86(CRITICAL_SECTION *lock)
  75 {
  76     _LeaveSysLevel(lock);
  77 }
  78
  79 /************************************************************************
  80  *           SYSLEVEL_EnterWin16Lock                    [KERNEL.480]
  81  */
  82 VOID WINAPI SYSLEVEL_EnterWin16Lock(VOID)
  83 {
  84     TRACE(win32, "thread %04x (pid %d) about to enter\n",
  85           THREAD_Current()->teb_sel, getpid());
  86
  87     _EnterSysLevel(&Win16Mutex);
  88
  89     TRACE(win32, "thread %04x (pid %d) entered, count is %ld\n",
  90           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
  91 }
  92
  93 /************************************************************************
  94  *           SYSLEVEL_LeaveWin16Lock            [KERNEL.481]
  95  */
  96 VOID WINAPI SYSLEVEL_LeaveWin16Lock(VOID)
  97 {
  98     TRACE(win32, "thread %04x (pid %d) about to leave, count is %ld\n",
  99           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
 100
 101     _LeaveSysLevel(&Win16Mutex);
 102 }
 103
 104 /************************************************************************
 105  *           _CheckNotSysLevel    (KERNEL32.94)
 106  */
 107 VOID WINAPI _CheckNotSysLevel(CRITICAL_SECTION *lock)
 108 {
 109     FIXME(win32, "()\n");
 110 }
 111
 112 /************************************************************************
 113  *           _ConfirmSysLevel    (KERNEL32.95)
 114  */
 115 VOID WINAPI _ConfirmSysLevel(CRITICAL_SECTION *lock)
 116 {
 117     FIXME(win32, "()\n");
 118 }
 119
 120 /************************************************************************
 121  *           _ConfirmWin16Lock    (KERNEL32.96)
 122  */
 123 DWORD WINAPI _ConfirmWin16Lock(void)
 124 {
 125     FIXME(win32, "()\n");
 126     return 1;
 127 }
 128
 129 /************************************************************************
 130  *           ReleaseThunkLock    (KERNEL32.48)
 131  */
 132 VOID WINAPI ReleaseThunkLock(DWORD *mutex_count)
 133 {
 134     DWORD count = Win16Mutex.RecursionCount;
 135     *mutex_count = count;
 136
 137     while (count-- > 0)
 138         _LeaveSysLevel(&Win16Mutex);
 139 }
 140
 141 /************************************************************************
 142  *           RestoreThunkLock    (KERNEL32.49)
 143  */
 144 VOID WINAPI RestoreThunkLock(DWORD mutex_count)
 145 {
 146     while (mutex_count-- > 0)
 147         _EnterSysLevel(&Win16Mutex);
 148 }
 149
 150 /************************************************************************
 151  *           SYSLEVEL_ReleaseWin16Lock
 152  */
 153 VOID SYSLEVEL_ReleaseWin16Lock(VOID)
 154 {
 155     DWORD count;
 156
 157     TRACE(win32, "thread %04x (pid %d) about to release, count is %ld\n",
 158           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
 159
 160     ReleaseThunkLock(&count);
 161
 162     if (count > 0xffff)
 163         ERR(win32, "Win16Mutex recursion count too large!\n");
 164
 165     CURRENT_STACK16->mutex_count = (WORD)count;
 166 }
 167
 168 /************************************************************************
 169  *           SYSLEVEL_RestoreWin16Lock
 170  */
 171 VOID SYSLEVEL_RestoreWin16Lock(VOID)
 172 {
 173     DWORD count = CURRENT_STACK16->mutex_count;
 174
 175     if (!count)
 176         ERR(win32, "Win16Mutex recursion count is zero!\n");
 177
 178     TRACE(win32, "thread %04x (pid %d) about to restore (count %ld)\n",
 179           THREAD_Current()->teb_sel, getpid(), count);
 180
 181     RestoreThunkLock(count);
 182
 183     TRACE(win32, "thread %04x (pid %d) restored lock, count is %ld\n",
 184           THREAD_Current()->teb_sel, getpid(), Win16Mutex.RecursionCount);
 185 }
 186