atomic_ops.c

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/* 
 * $Id$
 * 
 * Copyright (C) 2006 iptelorg GmbH
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
/*
 *  atomic operations init
 */
/* 
 * History:
 * --------
 *  2006-03-08  created by andrei
 *  2007-05-11  added lock_set support (andrei)
 */
#include "atomic_ops_init.h"
#include "atomic_ops.h"

#if defined ATOMIC_OPS_USE_LOCK  || defined ATOMIC_OPS_USE_LOCK_SET || \
        defined MEMBAR_USES_LOCK
#include "locking.h"
#endif

#ifdef MEMBAR_USES_LOCK
gen_lock_t* __membar_lock=0; /* init in atomic_ops.c */
#endif

#ifdef ATOMIC_OPS_USE_LOCK_SET
gen_lock_set_t* _atomic_lock_set=0;
#elif defined ATOMIC_OPS_USE_LOCK
gen_lock_t* _atomic_lock=0;
#endif


/* returns 0 on success, -1 on error */
int init_atomic_ops()
{
        
#ifdef MEMBAR_USES_LOCK
        if ((__membar_lock=lock_alloc())==0){
                goto error;
        }
        if (lock_init(__membar_lock)==0){
                lock_dealloc(__membar_lock);
                __membar_lock=0;
                goto error;
        }
        _membar_lock; /* start with the lock "taken" so that we can safely use
                                         unlock/lock sequences on it later */
#endif
#ifdef ATOMIC_OPS_USE_LOCK_SET
        if ((_atomic_lock_set=lock_set_alloc(_ATOMIC_LS_SIZE))==0){
                goto error;
        }
        if (lock_set_init(_atomic_lock_set)==0){
                lock_set_dealloc(_atomic_lock_set);
                _atomic_lock_set=0;
                goto error;
        }
#elif defined ATOMIC_OPS_USE_LOCK
        if ((_atomic_lock=lock_alloc())==0){
                goto error;
        }
        if (lock_init(_atomic_lock)==0){
                lock_dealloc(_atomic_lock);
                _atomic_lock=0;
                goto error;
        }
#endif /* ATOMIC_OPS_USE_LOCK_SET/ATOMIC_OPS_USE_LOCK */
        return 0;
#if defined MEMBAR_USES_LOCK || defined ATOMIC_OPS_USE_LOCK || \
        defined ATOMIC_OPS_USE_LOCK_SET
error:
        destroy_atomic_ops();
        return -1;
#endif
}



void destroy_atomic_ops()
{
#ifdef MEMBAR_USES_LOCK
        if (__membar_lock!=0){
                lock_destroy(__membar_lock);
                lock_dealloc(__membar_lock);
                __membar_lock=0;
        }
#endif
#ifdef ATOMIC_OPS_USE_LOCK_SET
        if (_atomic_lock_set!=0){
                lock_set_destroy(_atomic_lock_set);
                lock_set_dealloc(_atomic_lock_set);
                _atomic_lock_set=0;
        }
#elif defined ATOMIC_OPS_USE_LOCK
        if (_atomic_lock!=0){
                lock_destroy(_atomic_lock);
                lock_dealloc(_atomic_lock);
                _atomic_lock=0;
        }
#endif /* ATOMIC_OPS_USE_LOCK_SET / ATOMIC_OPS_USE_LOCK*/
}