FreeBSD/Linux Kernel Cross Reference
sys/sys/tls.h

     /*      $NetBSD: tls.h,v 1.2 2017/11/19 07:41:52 kamil Exp $    */
     /*-
      * Copyright (c) 2011 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Joerg Sonnenberger.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _SYS_TLS_H_
    #define _SYS_TLS_H_
    
    #include <sys/cdefs.h>
    #include <machine/types.h>
    
    #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
    
    #if defined(__HAVE_TLS_VARIANT_I) && defined(__HAVE_TLS_VARIANT_II)
    #error Only one TLS variant can be supported at a time
    #endif
    
    struct tls_tcb {
    #ifdef __HAVE_TLS_VARIANT_I
            void    **tcb_dtv;
            void    *tcb_pthread;
    #else
            void    *tcb_self;
            void    **tcb_dtv;
            void    *tcb_pthread;
    #endif
    };
    
    __BEGIN_PUBLIC_DECLS
    struct tls_tcb  *_rtld_tls_allocate(void);
    void             _rtld_tls_free(struct tls_tcb *);
    __END_PUBLIC_DECLS
    #endif /* __HAVE_TLS_VARIANT_I || __HAVE_TLS_VARIANT_II */
    
    #endif /* _SYS_TLS_H_ */

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