/*
* Copyright 2017-2018, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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.
*/
/*
* slab_allocator.c -- slab-like mechanism for libpmemobj
*/
#include "slab_allocator.h"
#include <stdlib.h>
struct slab_allocator {
PMEMobjpool *pop;
struct pobj_alloc_class_desc class;
};
/*
* slab_new -- creates a new slab allocator instance
*/
struct slab_allocator *
slab_new(PMEMobjpool *pop, size_t size)
{
struct slab_allocator *slab = malloc(sizeof(struct slab_allocator));
if (slab == NULL)
return NULL;
slab->pop = pop;
slab->class.header_type = POBJ_HEADER_NONE;
slab->class.unit_size = size;
slab->class.alignment = 0;
/* should be a reasonably high number, but not too crazy */
slab->class.units_per_block = 1000;
if (pmemobj_ctl_set(pop,
"heap.alloc_class.new.desc", &slab->class) != 0)
goto error;
return slab;
error:
free(slab);
return NULL;
}
/*
* slab_delete -- deletes an existing slab allocator instance
*/
void
slab_delete(struct slab_allocator *slab)
{
free(slab);
}
/*
* slab_alloc -- works just like pmemobj_alloc but uses the predefined
* blocks from the slab
*/
int
slab_alloc(struct slab_allocator *slab, PMEMoid *oid,
pmemobj_constr constructor, void *arg)
{
return pmemobj_xalloc(slab->pop, oid, slab->class.unit_size, 0,
POBJ_CLASS_ID(slab->class.class_id),
constructor, arg);
}
/*
* slab_tx_alloc -- works just like pmemobj_tx_alloc but uses the predefined
* blocks from the slab
*/
PMEMoid
slab_tx_alloc(struct slab_allocator *slab)
{
return pmemobj_tx_xalloc(slab->class.unit_size, 0,
POBJ_CLASS_ID(slab->class.class_id));
}