forked from KolibriOS/kolibrios
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2009 Chris Wilson
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is University of Southern
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* California.
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*
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* Contributor(s):
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* Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#ifndef CAIRO_FREED_POOL_H
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#define CAIRO_FREED_POOL_H
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#include "cairoint.h"
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#include "cairo-atomic-private.h"
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CAIRO_BEGIN_DECLS
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#define DISABLE_FREED_POOLS 0
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#if HAS_ATOMIC_OPS && ! DISABLE_FREED_POOLS
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/* Keep a stash of recently freed clip_paths, since we need to
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* reallocate them frequently.
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*/
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#define MAX_FREED_POOL_SIZE 16
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typedef struct {
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void *pool[MAX_FREED_POOL_SIZE];
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int top;
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} freed_pool_t;
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static cairo_always_inline void *
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_atomic_fetch (void **slot)
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{
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void *ptr;
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do {
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ptr = _cairo_atomic_ptr_get (slot);
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} while (! _cairo_atomic_ptr_cmpxchg (slot, ptr, NULL));
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return ptr;
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}
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static cairo_always_inline cairo_bool_t
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_atomic_store (void **slot, void *ptr)
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{
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return _cairo_atomic_ptr_cmpxchg (slot, NULL, ptr);
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}
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cairo_private void *
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_freed_pool_get_search (freed_pool_t *pool);
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static inline void *
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_freed_pool_get (freed_pool_t *pool)
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{
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void *ptr;
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int i;
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i = pool->top - 1;
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if (i < 0)
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i = 0;
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ptr = _atomic_fetch (&pool->pool[i]);
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if (likely (ptr != NULL)) {
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pool->top = i;
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return ptr;
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}
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/* either empty or contended */
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return _freed_pool_get_search (pool);
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}
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cairo_private void
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_freed_pool_put_search (freed_pool_t *pool, void *ptr);
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static inline void
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_freed_pool_put (freed_pool_t *pool, void *ptr)
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{
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int i;
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i = pool->top;
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if (likely (i < ARRAY_LENGTH (pool->pool) &&
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_atomic_store (&pool->pool[i], ptr)))
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{
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pool->top = i + 1;
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return;
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}
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/* either full or contended */
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_freed_pool_put_search (pool, ptr);
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}
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cairo_private void
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_freed_pool_reset (freed_pool_t *pool);
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#define HAS_FREED_POOL 1
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#else
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/* A warning about an unused freed-pool in a build without atomics
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* enabled usually indicates a missing _freed_pool_reset() in the
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* static reset function */
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typedef int freed_pool_t;
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#define _freed_pool_get(pool) NULL
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#define _freed_pool_put(pool, ptr) free(ptr)
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#define _freed_pool_reset(ptr)
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#endif
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CAIRO_END_DECLS
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#endif /* CAIRO_FREED_POOL_PRIVATE_H */
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