include/wx/unix/tls.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/unix/tls.h
   3 // Purpose:     Pthreads 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_UNIX_TLS_H_
  12 #define _WX_UNIX_TLS_H_
  13
  14 #include <pthread.h>
  15
  16 // ----------------------------------------------------------------------------
  17 // wxTlsKey is a helper class encapsulating the TLS value index
  18 // ----------------------------------------------------------------------------
  19
  20 class wxTlsKey
  21 {
  22 public:
  23     // ctor allocates a new key and possibly registering a destructor function
  24     // for it
  25     wxTlsKey(wxTlsDestructorFunction destructor)
  26     {
  27         m_destructor = destructor;
  28         if ( pthread_key_create(&m_key, destructor) != 0 )
  29             m_key = 0;
  30     }
  31
  32     // return true if the key was successfully allocated
  33     bool IsOk() const { return m_key != 0; }
  34
  35     // get the key value, there is no error return
  36     void *Get() const
  37     {
  38         return pthread_getspecific(m_key);
  39     }
  40
  41     // change the key value, return true if ok
  42     bool Set(void *value)
  43     {
  44         void *old = Get();
  45         if ( old )
  46             m_destructor(old);
  47
  48         return pthread_setspecific(m_key, value) == 0;
  49     }
  50
  51     // free the key
  52     ~wxTlsKey()
  53     {
  54         if ( IsOk() )
  55             pthread_key_delete(m_key);
  56     }
  57
  58 private:
  59     wxTlsDestructorFunction m_destructor;
  60     pthread_key_t m_key;
  61
  62     wxDECLARE_NO_COPY_CLASS(wxTlsKey);
  63 };
  64
  65 #endif // _WX_UNIX_TLS_H_
  66