include/wx/msw/tls.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/unix/tls.h
   3 // Purpose:     Win32 implementation of wxTlsValue<>
   4 // Author:      Vadim Zeitlin
   5 // Created:     2008-08-08
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_MSW_TLS_H_
  12 #define _WX_MSW_TLS_H_
  13
  14 #include "wx/log.h"
  15
  16 #include "wx/msw/wrapwin.h"
  17
  18 // ----------------------------------------------------------------------------
  19 // wxTlsKey is a helper class encapsulating a TLS slot
  20 // ----------------------------------------------------------------------------
  21
  22 class wxTlsKey
  23 {
  24 public:
  25     // ctor allocates a new key
  26     wxTlsKey()
  27     {
  28         m_slot = ::TlsAlloc();
  29         if ( m_slot == TLS_OUT_OF_INDEXES )
  30             wxLogError("Creating TLS key failed");
  31     }
  32
  33     // return true if the key was successfully allocated
  34     bool IsOk() const { return m_slot != TLS_OUT_OF_INDEXES; }
  35
  36     // get the key value, there is no error return
  37     void *Get() const
  38     {
  39         return ::TlsGetValue(m_slot);
  40     }
  41
  42     // change the key value, return true if ok
  43     bool Set(void *value)
  44     {
  45         if ( !::TlsSetValue(m_slot, value) )
  46         {
  47             wxLogSysError(_("Failed to set TLS value"));
  48             return false;
  49         }
  50
  51         return true;
  52     }
  53
  54     // free the key
  55     ~wxTlsKey()
  56     {
  57         if ( IsOk() )
  58         {
  59             if ( !::TlsFree(m_slot) )
  60             {
  61                 wxLogDebug("TlsFree() failed: %08x", ::GetLastError());
  62             }
  63         }
  64     }
  65
  66 private:
  67     DWORD m_slot;
  68
  69     DECLARE_NO_COPY_CLASS(wxTlsKey)
  70 };
  71
  72 #endif // _WX_MSW_TLS_H_
  73