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 // Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef _WX_UNIX_TLS_H_
  11 #define _WX_UNIX_TLS_H_
  12
  13 #include <pthread.h>
  14
  15 // ----------------------------------------------------------------------------
  16 // wxTlsKey is a helper class encapsulating the TLS value index
  17 // ----------------------------------------------------------------------------
  18
  19 class wxTlsKey
  20 {
  21 public:
  22     // ctor allocates a new key and possibly registering a destructor function
  23     // for it
  24     wxTlsKey(wxTlsDestructorFunction destructor)
  25     {
  26         m_destructor = destructor;
  27         if ( pthread_key_create(&m_key, destructor) != 0 )
  28             m_key = 0;
  29     }
  30
  31     // return true if the key was successfully allocated
  32     bool IsOk() const { return m_key != 0; }
  33
  34     // get the key value, there is no error return
  35     void *Get() const
  36     {
  37         return pthread_getspecific(m_key);
  38     }
  39
  40     // change the key value, return true if ok
  41     bool Set(void *value)
  42     {
  43         void *old = Get();
  44         if ( old )
  45             m_destructor(old);
  46
  47         return pthread_setspecific(m_key, value) == 0;
  48     }
  49
  50     // free the key
  51     ~wxTlsKey()
  52     {
  53         if ( IsOk() )
  54             pthread_key_delete(m_key);
  55     }
  56
  57 private:
  58     wxTlsDestructorFunction m_destructor;
  59     pthread_key_t m_key;
  60
  61     wxDECLARE_NO_COPY_CLASS(wxTlsKey);
  62 };
  63
  64 #endif // _WX_UNIX_TLS_H_
  65