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/*
* Copyright © 2006 Joonas Pihlaja
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, 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.
*/
#ifndef CAIRO_FREELIST_H
#define CAIRO_FREELIST_H
#include "cairo-types-private.h"
#include "cairo-compiler-private.h"
/* for stand-alone compilation*/
#ifndef VG
#define VG(x)
#endif
#ifndef NULL
#define NULL (void *) 0
#endif
typedef struct _cairo_freelist_node cairo_freelist_node_t;
struct _cairo_freelist_node {
cairo_freelist_node_t *next;
};
typedef struct _cairo_freelist {
cairo_freelist_node_t *first_free_node;
unsigned nodesize;
} cairo_freelist_t;
typedef struct _cairo_freelist_pool cairo_freelist_pool_t;
struct _cairo_freelist_pool {
cairo_freelist_pool_t *next;
unsigned size, rem;
uint8_t *data;
};
typedef struct _cairo_freepool {
cairo_freelist_node_t *first_free_node;
cairo_freelist_pool_t *pools;
unsigned nodesize;
cairo_freelist_pool_t embedded_pool;
uint8_t embedded_data[1000];
} cairo_freepool_t;
/* Initialise a freelist that will be responsible for allocating
* nodes of size nodesize. */
cairo_private void
_cairo_freelist_init (cairo_freelist_t *freelist, unsigned nodesize);
/* Deallocate any nodes in the freelist. */
cairo_private void
_cairo_freelist_fini (cairo_freelist_t *freelist);
/* Allocate a new node from the freelist. If the freelist contains no
* nodes, a new one will be allocated using malloc(). The caller is
* responsible for calling _cairo_freelist_free() or free() on the
* returned node. Returns %NULL on memory allocation error. */
cairo_private void *
_cairo_freelist_alloc (cairo_freelist_t *freelist);
/* Allocate a new node from the freelist. If the freelist contains no
* nodes, a new one will be allocated using calloc(). The caller is
* responsible for calling _cairo_freelist_free() or free() on the
* returned node. Returns %NULL on memory allocation error. */
cairo_private void *
_cairo_freelist_calloc (cairo_freelist_t *freelist);
/* Return a node to the freelist. This does not deallocate the memory,
* but makes it available for later reuse by
* _cairo_freelist_alloc(). */
cairo_private void
_cairo_freelist_free (cairo_freelist_t *freelist, void *node);
cairo_private void
_cairo_freepool_init (cairo_freepool_t *freepool, unsigned nodesize);
cairo_private void
_cairo_freepool_fini (cairo_freepool_t *freepool);
cairo_private void *
_cairo_freepool_alloc_from_new_pool (cairo_freepool_t *freepool);
static inline void *
_cairo_freepool_alloc_from_pool (cairo_freepool_t *freepool)
{
cairo_freelist_pool_t *pool;
uint8_t *ptr;
pool = freepool->pools;
if (unlikely (freepool->nodesize > pool->rem))
return _cairo_freepool_alloc_from_new_pool (freepool);
ptr = pool->data;
pool->data += freepool->nodesize;
pool->rem -= freepool->nodesize;
VG (VALGRIND_MAKE_MEM_UNDEFINED (ptr, freepool->nodesize));
return ptr;
}
static inline void *
_cairo_freepool_alloc (cairo_freepool_t *freepool)
{
cairo_freelist_node_t *node;
node = freepool->first_free_node;
if (unlikely (node == NULL))
return _cairo_freepool_alloc_from_pool (freepool);
VG (VALGRIND_MAKE_MEM_DEFINED (node, sizeof (node->next)));
freepool->first_free_node = node->next;
VG (VALGRIND_MAKE_MEM_UNDEFINED (node, freepool->nodesize));
return node;
}
static inline void
_cairo_freepool_free (cairo_freepool_t *freepool, void *ptr)
{
cairo_freelist_node_t *node = ptr;
node->next = freepool->first_free_node;
freepool->first_free_node = node;
VG (VALGRIND_MAKE_MEM_NOACCESS (node, freepool->nodesize));
}
#endif /* CAIRO_FREELIST_H */
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