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 DWORD STDCALL
  24 TlsAlloc(VOID)
  25 {
  26    ULONG Index;
  27
  28    RtlAcquirePebLock();
  29    Index = RtlFindClearBitsAndSet (NtCurrentPeb()->TlsBitmap, 1, 0);
  30    if (Index == (ULONG)-1)
  31      {
  32        SetLastErrorByStatus(STATUS_NO_MEMORY);
  33      }
  34    else
  35      {
  36        NtCurrentTeb()->TlsSlots[Index] = 0;
  37      }
  38    RtlReleasePebLock();
  39
  40    return(Index);
  41 }
  42
  43 WINBOOL STDCALL
  44 TlsFree(DWORD dwTlsIndex)
  45 {
  46    if (dwTlsIndex >= TLS_MINIMUM_AVAILABLE)
  47      {
  48         SetLastErrorByStatus(STATUS_INVALID_PARAMETER);
  49         return(FALSE);
  50      }
  51
  52    RtlAcquirePebLock();
  53    if (RtlAreBitsSet(NtCurrentPeb()->TlsBitmap, dwTlsIndex, 1))
  54      {
  55         /*
  56          * clear the tls cells (slots) in all threads
  57          * of the current process
  58          */
  59         NtSetInformationThread(NtCurrentThread(),
  60                                ThreadZeroTlsCell,
  61                                &dwTlsIndex,
  62                                sizeof(DWORD));
  63         RtlClearBits(NtCurrentPeb()->TlsBitmap,
  64                      dwTlsIndex,
  65                      1);
  66      }
  67    RtlReleasePebLock();
  68
  69    return(TRUE);
  70 }
  71
  72 LPVOID STDCALL
  73 TlsGetValue(DWORD dwTlsIndex)
  74 {
  75    LPVOID Value;
  76
  77    if (dwTlsIndex >= TLS_MINIMUM_AVAILABLE)
  78      {
  79         SetLastErrorByStatus(STATUS_INVALID_PARAMETER);
  80         return(NULL);
  81      }
  82
  83    Value = NtCurrentTeb()->TlsSlots[dwTlsIndex];
  84    if (Value == 0)
  85    {
  86       SetLastError(NO_ERROR);
  87    }
  88    return Value;
  89 }
  90
  91 WINBOOL STDCALL
  92 TlsSetValue(DWORD dwTlsIndex, LPVOID lpTlsValue)
  93 {
  94    if (dwTlsIndex >= TLS_MINIMUM_AVAILABLE)
  95      {
  96         SetLastErrorByStatus(STATUS_INVALID_PARAMETER);
  97         return(FALSE);
  98      }
  99    NtCurrentTeb()->TlsSlots[dwTlsIndex] = lpTlsValue;
 100    return(TRUE);
 101 }
 102
 103 /* EOF */