NetBSD/sys/kern/subr_lwp_specificdata.c

132 lines
3.7 KiB
C

/* $NetBSD: subr_lwp_specificdata.c,v 1.3 2013/10/25 16:17:35 martin 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 1.3 2013/10/25 16:17:35 martin 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);
}