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 #include "wx/intl.h"
  16
  17 #include "wx/msw/wrapwin.h"
  18
  19 // ----------------------------------------------------------------------------
  20 // wxTlsKey is a helper class encapsulating a TLS slot
  21 // ----------------------------------------------------------------------------
  22
  23 class wxTlsKey
  24 {
  25 public:
  26     // ctor allocates a new key
  27     wxTlsKey()
  28     {
  29         m_slot = ::TlsAlloc();
  30         if ( m_slot == TLS_OUT_OF_INDEXES )
  31             wxLogError("Creating TLS key failed");
  32     }
  33
  34     // return true if the key was successfully allocated
  35     bool IsOk() const { return m_slot != TLS_OUT_OF_INDEXES; }
  36
  37     // get the key value, there is no error return
  38     void *Get() const
  39     {
  40         return ::TlsGetValue(m_slot);
  41     }
  42
  43     // change the key value, return true if ok
  44     bool Set(void *value)
  45     {
  46         if ( !::TlsSetValue(m_slot, value) )
  47         {
  48             wxLogSysError(_("Failed to set TLS value"));
  49             return false;
  50         }
  51
  52         return true;
  53     }
  54
  55     // free the key
  56     ~wxTlsKey()
  57     {
  58         if ( IsOk() )
  59         {
  60             if ( !::TlsFree(m_slot) )
  61             {
  62                 wxLogDebug("TlsFree() failed: %08x", ::GetLastError());
  63             }
  64         }
  65     }
  66
  67 private:
  68     DWORD m_slot;
  69
  70     DECLARE_NO_COPY_CLASS(wxTlsKey)
  71 };
  72
  73 #endif // _WX_MSW_TLS_H_
  74