FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_lwp_specificdata.c

     /*      $NetBSD: subr_lwp_specificdata.c,v 1.4 2019/05/17 03:34:26 ozaki-r Exp $        */
     
     /*-
      * Copyright (c) 2006 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * 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.
     */
    
    #define _LWP_API_PRIVATE
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: subr_lwp_specificdata.c,v 1.4 2019/05/17 03:34:26 ozaki-r Exp $");
    
    #include <sys/param.h>
    #include <sys/lwp.h>
    #include <sys/specificdata.h>
    
    static specificdata_domain_t lwp_specificdata_domain;
    
    void
    lwpinit_specificdata(void)
    {
    
            lwp_specificdata_domain = specificdata_domain_create();
            KASSERT(lwp_specificdata_domain != NULL);
    }
    
    /*
     * lwp_specific_key_create --
     *      Create a key for subsystem lwp-specific data.
     */
    int
    lwp_specific_key_create(specificdata_key_t *keyp, specificdata_dtor_t dtor)
    {
    
            return (specificdata_key_create(lwp_specificdata_domain, keyp, dtor));
    }
    
    /*
     * lwp_specific_key_delete --
     *      Delete a key for subsystem lwp-specific data.
     */
    void
    lwp_specific_key_delete(specificdata_key_t key)
    {
    
            specificdata_key_delete(lwp_specificdata_domain, key);
    }
    
    /*
     * lwp_initspecific --
     *      Initialize an LWP's specificdata container.
     */
    void
    lwp_initspecific(struct lwp *l)
    {
            int error __diagused;
    
            error = specificdata_init(lwp_specificdata_domain, &l->l_specdataref);
            KASSERT(error == 0);
    }
    
    /*
     * lwp_finispecific --
     *      Finalize an LWP's specificdata container.
     */
    void
    lwp_finispecific(struct lwp *l)
    {
    
            specificdata_fini(lwp_specificdata_domain, &l->l_specdataref);
    }
    
    /*
     * lwp_getspecific --
     *      Return lwp-specific data corresponding to the specified key.
     *
     *      Note: LWP specific data is NOT INTERLOCKED.  An LWP should access
     *      only its OWN SPECIFIC DATA.  If it is necessary to access another
    *      LWP's specifc data, care must be taken to ensure that doing so
    *      would not cause internal data structure inconsistency (i.e. caller
    *      can guarantee that the target LWP is not inside an lwp_getspecific()
    *      or lwp_setspecific() call).
    */
   void *
   lwp_getspecific(specificdata_key_t key)
   {
   
           return (specificdata_getspecific_unlocked(lwp_specificdata_domain,
                                                     &curlwp->l_specdataref, key));
   }
   
   void *
   _lwp_getspecific_by_lwp(struct lwp *l, specificdata_key_t key)
   {
   
           return (specificdata_getspecific_unlocked(lwp_specificdata_domain,
                                                     &l->l_specdataref, key));
   }
   
   /*
    * lwp_setspecific --
    *      Set lwp-specific data corresponding to the specified key.
    */
   void
   lwp_setspecific(specificdata_key_t key, void *data)
   {
   
           specificdata_setspecific(lwp_specificdata_domain,
                                    &curlwp->l_specdataref, key, data);
   }
   
   void
   lwp_setspecific_by_lwp(struct lwp *l, specificdata_key_t key, void *data)
   {
   
           specificdata_setspecific(lwp_specificdata_domain,
                                    &l->l_specdataref, key, data);
   }

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