modules_k/p_usrloc/hslot.c

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/*
 * $Id: hslot.c 5241 2008-11-21 12:52:25Z henningw $ 
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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
 */

#include "hslot.h"

int ul_locks_no=4;
gen_lock_set_t* ul_locks=0;


int ul_init_locks(void)
{
        int i;
        i = ul_locks_no;
        do {
                if ((( ul_locks=lock_set_alloc(i))!=0)&&
                                (lock_set_init(ul_locks)!=0))
                {
                        ul_locks_no = i;
                        LM_INFO("locks array size %d\n", ul_locks_no);
                        return 0;

                }
                if (ul_locks){
                        lock_set_dealloc(ul_locks);
                        ul_locks=0;
                }
                i--;
                if(i==0)
                {
                        LM_ERR("failed to allocate locks\n");
                        return -1;
                }
        } while (1);
}


void ul_unlock_locks(void)
{
        unsigned int i;

        if (ul_locks==0)
                return;

        for (i=0;i<ul_locks_no;i++) {
#ifdef GEN_LOCK_T_PREFERED
                lock_release(&ul_locks->locks[i]);
#else
                ul_release_idx(i);
#endif
        };
}


void ul_destroy_locks(void)
{
        if (ul_locks !=0){
                lock_set_destroy(ul_locks);
                lock_set_dealloc(ul_locks);
        };
}

#ifndef GEN_LOCK_T_PREFERED

void ul_lock_idx(int idx)
{
        lock_set_get(ul_locks, idx);
}


void ul_release_idx(int idx)
{
        lock_set_release(ul_locks, idx);
}
#endif

void init_slot(struct udomain* _d, hslot_t* _s, int n)
{
        _s->n = 0;
        _s->first = 0;
        _s->last = 0;
        _s->d = _d;

#ifdef GEN_LOCK_T_PREFERED
        _s->lock = &ul_locks->locks[n%ul_locks_no];
#else
        _s->lockidx = n%ul_locks_no;
#endif
}


void deinit_slot(hslot_t* _s)
{
        struct urecord* ptr;
        
             /* Remove all elements */
        while(_s->first) {
                ptr = _s->first;
                _s->first = _s->first->next;
                free_urecord(ptr);
        }
        
        _s->n = 0;
        _s->last = 0;
    _s->d = 0;
}


void slot_add(hslot_t* _s, struct urecord* _r)
{
        if (_s->n == 0) {
                _s->first = _s->last = _r;
        } else {
                _r->prev = _s->last;
                _s->last->next = _r;
                _s->last = _r;
        }
        _s->n++;
        _r->slot = _s;
}


void slot_rem(hslot_t* _s, struct urecord* _r)
{
        if (_r->prev) {
                _r->prev->next = _r->next;
        } else {
                _s->first = _r->next;
        }

        if (_r->next) {
                _r->next->prev = _r->prev;
        } else {
                _s->last = _r->prev;
        }

        _r->prev = _r->next = 0;
        _r->slot = 0;
        _s->n--;
}