/usr/include/wx-3.0/wx/unix/tls.h is in wx3.0-headers 3.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Name:        wx/unix/tls.h
// Purpose:     Pthreads implementation of wxTlsValue<>
// Author:      Vadim Zeitlin
// Created:     2008-08-08
// Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_UNIX_TLS_H_
#define _WX_UNIX_TLS_H_
#include <pthread.h>
// ----------------------------------------------------------------------------
// wxTlsKey is a helper class encapsulating the TLS value index
// ----------------------------------------------------------------------------
class wxTlsKey
{
public:
    // ctor allocates a new key and possibly registering a destructor function
    // for it
    wxTlsKey(wxTlsDestructorFunction destructor)
    {
        m_destructor = destructor;
        if ( pthread_key_create(&m_key, destructor) != 0 )
            m_key = 0;
    }
    // return true if the key was successfully allocated
    bool IsOk() const { return m_key != 0; }
    // get the key value, there is no error return
    void *Get() const
    {
        return pthread_getspecific(m_key);
    }
    // change the key value, return true if ok
    bool Set(void *value)
    {
        void *old = Get();
        if ( old )
            m_destructor(old);
        return pthread_setspecific(m_key, value) == 0;
    }
    // free the key
    ~wxTlsKey()
    {
        if ( IsOk() )
            pthread_key_delete(m_key);
    }
private:
    wxTlsDestructorFunction m_destructor;
    pthread_key_t m_key;
    wxDECLARE_NO_COPY_CLASS(wxTlsKey);
};
#endif // _WX_UNIX_TLS_H_
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