include/wx/tls.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/tls.h
   3 // Purpose:     Implementation of thread local storage
   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_TLS_H_
  12 #define _WX_TLS_H_
  13
  14 #include "wx/defs.h"
  15
  16 // ----------------------------------------------------------------------------
  17 // check for compiler support of thread-specific variables
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef HAVE___THREAD_KEYWORD
  21     #define wxHAS_COMPILER_TLS
  22     #define wxTHREAD_SPECIFIC_DECL __thread
  23 #elif wxCHECK_VISUALC_VERSION(7)
  24     #define wxHAS_COMPILER_TLS
  25     #define wxTHREAD_SPECIFIC_DECL __declspec(thread)
  26 #endif
  27
  28 // ----------------------------------------------------------------------------
  29 // define wxTLS_TYPE()
  30 // ----------------------------------------------------------------------------
  31
  32 #ifdef wxHAS_COMPILER_TLS
  33     #define wxTLS_TYPE(T) wxTHREAD_SPECIFIC_DECL T
  34 #else // !wxHAS_COMPILER_TLS
  35     #ifdef __WXMSW__
  36         #include "wx/msw/tls.h"
  37     #elif defined(__UNIX__)
  38         #include "wx/unix/tls.h"
  39     #else
  40         // TODO: we could emulate TLS for such platforms...
  41         #error Neither compiler nor OS support thread-specific variables.
  42     #endif
  43
  44     // wxTlsValue<T> represents a thread-specific value of type T
  45     template <typename T>
  46     class wxTlsValue
  47     {
  48     public:
  49         typedef T ValueType;
  50
  51         wxTlsValue() { *this = static_cast<T>(0); }
  52
  53         wxTlsValue& operator=(T value)
  54         {
  55             m_key.Set(wxUIntToPtr(value));
  56
  57             return *this;
  58         }
  59
  60         operator T() const { return wxPtrToUInt(m_key.Get()); }
  61
  62     private:
  63         wxTlsKey m_key;
  64
  65         DECLARE_NO_COPY_TEMPLATE_CLASS(wxTlsValue, T)
  66     };
  67
  68     #define wxTLS_TYPE(T) wxTlsValue<T>
  69 #endif // wxHAS_COMPILER_TLS/!wxHAS_COMPILER_TLS
  70
  71 #endif // _WX_TLS_H_
  72