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/* class-init.c - Initialize a capability class.
Copyright (C) 2004 Free Software Foundation, Inc.
Written by Marcus Brinkmann <marcus@gnu.org>
This file is part of the GNU Hurd.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <assert.h>
#include <stdlib.h>
#include <pthread.h>
#include <hurd/slab.h>
#include <hurd/cap-server.h>
/* Initialize the slab object pointed to by BUFFER. HOOK is as
provided to hurd_slab_create. */
static error_t
_hurd_cap_obj_constructor (void *hook, void *buffer)
{
hurd_cap_class_t cap_class = (hurd_cap_class_t) hook;
hurd_cap_obj_t obj = (hurd_cap_obj_t) buffer;
error_t err;
/* First do our own initialization. */
obj->cap_class = cap_class;
err = pthread_mutex_init (&obj->lock, 0);
if (err)
return err;
obj->refs = 1;
obj->state = _HURD_CAP_STATE_GREEN;
obj->pending_rpcs = NULL;
/* The member COND_WAITER does not need to be initialized. */
obj->clients = NULL;
/* Then do the user part, if necessary. */
if (cap_class->obj_init)
{
err = (*cap_class->obj_init) (cap_class, obj);
if (err)
{
pthread_mutex_destroy (&obj->lock);
return err;
}
}
return 0;
}
/* Destroy the slab object pointed to by BUFFER. HOOK is as provided
to hurd_slab_create. */
static void
_hurd_cap_obj_destructor (void *hook, void *buffer)
{
hurd_cap_class_t cap_class = (hurd_cap_class_t) hook;
hurd_cap_obj_t obj = (hurd_cap_obj_t) buffer;
if (cap_class->obj_destroy)
(*cap_class->obj_destroy) (cap_class, obj);
pthread_mutex_destroy (&obj->lock);
}
/* Same as hurd_cap_class_create, but doesn't allocate the storage for
CAP_CLASS. Instead, you have to provide it. */
error_t
hurd_cap_class_init (hurd_cap_class_t cap_class,
size_t size, size_t alignment,
hurd_cap_obj_init_t obj_init,
hurd_cap_obj_alloc_t obj_alloc,
hurd_cap_obj_reinit_t obj_reinit,
hurd_cap_obj_destroy_t obj_destroy,
hurd_cap_class_demuxer_t demuxer)
{
error_t err;
assert (size >= sizeof (struct hurd_cap_obj));
assert (alignment >= __alignof__(struct hurd_cap_obj));
/* Capability object management. */
cap_class->obj_init = obj_init;
cap_class->obj_alloc = obj_alloc;
cap_class->obj_reinit = obj_reinit;
cap_class->obj_destroy = obj_destroy;
err = hurd_slab_init (&cap_class->obj_space, size, alignment,
_hurd_cap_obj_constructor, _hurd_cap_obj_destructor,
cap_class);
if (err)
goto err_obj_space;
err = pthread_cond_init (&cap_class->obj_cond, NULL);
if (err)
goto err_obj_cond;
err = pthread_mutex_init (&cap_class->obj_cond_lock, NULL);
if (err)
goto err_obj_cond_lock;
/* Class management. */
cap_class->demuxer = demuxer;
err = pthread_mutex_init (&cap_class->lock, NULL);
if (err)
goto err_lock;
cap_class->state = _HURD_CAP_STATE_GREEN;
err = pthread_cond_init (&cap_class->cond, NULL);
if (err)
goto err_cond;
/* The cond_waiter member doesn't need to be initialized. It is set
whenever the state changes to _HURD_CAP_STATE_YELLOW by the
inhibitor. */
cap_class->pending_rpcs = NULL;
/* FIXME: Add the class to the list of classes to be served by
RPCs. */
return 0;
/* This is provided here in case you add more initialization to the
end of the above code. */
#if 0
pthread_cond_destroy (&cap_class->cond);
#endif
err_cond:
pthread_mutex_destroy (&cap_class->lock);
err_lock:
pthread_mutex_destroy (&cap_class->obj_cond_lock);
err_obj_cond_lock:
pthread_cond_destroy (&cap_class->obj_cond);
err_obj_cond:
/* This can not fail at this point. */
hurd_slab_destroy (&cap_class->obj_space);
err_obj_space:
return err;
}
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