Added implementation of thread local storage for OS/2.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55384 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/tls.h

@@ -0,0 +1,61 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/os2/tls.h
+// Purpose:     OS/2 implementation of wxTlsValue<>
+// Author:      Stefan Neis
+// Created:     2008-08-30
+// RCS-ID:      $Id$
+// Copyright:   (c) 2008 Stefan Neis
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_TLS_H_
+#define _WX_MSW_TLS_H_
+
+#include "wx/os2/private.h"
+
+// ----------------------------------------------------------------------------
+// wxTlsKey is a helper class encapsulating a TLS slot
+// ----------------------------------------------------------------------------
+
+class wxTlsKey
+{
+public:
+    // ctor allocates a new key
+    wxTlsKey()
+    {
+        APIRET rc = ::DosAllocThreadLocalMemory(1, &m_slot);
+	if (rc != NO_ERROR)
+	    m_slot = NULL;
+    }
+
+    // return true if the key was successfully allocated
+    bool IsOk() const { return m_slot != NULL; }
+
+    // get the key value, there is no error return
+    void *Get() const
+    {
+        return (void *)m_slot;
+    }
+
+    // change the key value, return true if ok
+    bool Set(void *value)
+    {
+        m_slot = (ULONG*)value;
+	return true;
+    }
+
+    // free the key
+    ~wxTlsKey()
+    {
+        if ( IsOk() )
+            ::DosFreeThreadLocalMemory(m_slot);
+    }
+
+private:
+    ULONG* m_slot;
+
+    DECLARE_NO_COPY_CLASS(wxTlsKey)
+};
+
+#endif // _WX_MSW_TLS_H_
+