lib/kernel32/thread/tls.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS system libraries
   5  * FILE:            lib/kernel32/thread/tls.c
   6  * PURPOSE:         Thread functions
   7  * PROGRAMMER:      Ariadne ( ariadne@xs4all.nl)
   8  *                  Tls functions are modified from WINE
   9  * UPDATE HISTORY:
  10  *                  Created 01/11/98
  11  */
  12
  13 /* INCLUDES ******************************************************************/
  14
  15 #include <k32.h>
  16
  17 #define NDEBUG
  18 #include <kernel32/kernel32.h>
  19
  20
  21 /* FUNCTIONS *****************************************************************/
  22
  23 /*
  24  * @implemented
  25  */
  26 DWORD STDCALL
  27 TlsAlloc(VOID)
  28 {
  29    ULONG Index;
  30
  31    RtlAcquirePebLock();
  32    Index = RtlFindClearBitsAndSet (NtCurrentPeb()->TlsBitmap, 1, 0);
  33    if (Index == (ULONG)-1)
  34      {
  35        SetLastErrorByStatus(STATUS_NO_MEMORY);
  36      }
  37    else
  38      {
  39        NtCurrentTeb()->TlsSlots[Index] = 0;
  40      }
  41    RtlReleasePebLock();
  42
  43    return(Index);
  44 }
  45
  46
  47 /*
  48  * @implemented
  49  */
  50 WINBOOL STDCALL
  51 TlsFree(DWORD dwTlsIndex)
  52 {
  53    if (dwTlsIndex >= TLS_MINIMUM_AVAILABLE)
  54      {
  55         SetLastErrorByStatus(STATUS_INVALID_PARAMETER);
  56         return(FALSE);
  57      }
  58
  59    RtlAcquirePebLock();
  60    if (RtlAreBitsSet(NtCurrentPeb()->TlsBitmap, dwTlsIndex, 1))
  61      {
  62         /*
  63          * clear the tls cells (slots) in all threads
  64          * of the current process
  65          */
  66         NtSetInformationThread(NtCurrentThread(),
  67                                ThreadZeroTlsCell,
  68                                &dwTlsIndex,
  69                                sizeof(DWORD));
  70         RtlClearBits(NtCurrentPeb()->TlsBitmap,
  71                      dwTlsIndex,
  72                      1);
  73      }
  74    RtlReleasePebLock();
  75
  76    return(TRUE);
  77 }
  78
  79
  80 /*
  81  * @implemented
  82  */
  83 LPVOID STDCALL
  84 TlsGetValue(DWORD dwTlsIndex)
  85 {
  86    LPVOID Value;
  87
  88    if (dwTlsIndex >= TLS_MINIMUM_AVAILABLE)
  89      {
  90         SetLastErrorByStatus(STATUS_INVALID_PARAMETER);
  91         return(NULL);
  92      }
  93
  94    Value = NtCurrentTeb()->TlsSlots[dwTlsIndex];
  95    if (Value == 0)
  96    {
  97       SetLastError(NO_ERROR);
  98    }
  99    return Value;
 100 }
 101
 102
 103 /*
 104  * @implemented
 105  */
 106 WINBOOL STDCALL
 107 TlsSetValue(DWORD dwTlsIndex, LPVOID lpTlsValue)
 108 {
 109    if (dwTlsIndex >= TLS_MINIMUM_AVAILABLE)
 110      {
 111         SetLastErrorByStatus(STATUS_INVALID_PARAMETER);
 112         return(FALSE);
 113      }
 114    NtCurrentTeb()->TlsSlots[dwTlsIndex] = lpTlsValue;
 115    return(TRUE);
 116 }
 117
 118 /* EOF */