diff options
author | Peter Breitenlohner <peb@mppmu.mpg.de> | 2015-03-11 09:31:39 +0000 |
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committer | Peter Breitenlohner <peb@mppmu.mpg.de> | 2015-03-11 09:31:39 +0000 |
commit | 03b9375ab75a28d12e255dd3202d9c23d97a3021 (patch) | |
tree | d47e3a0265b22a4946cd0f413851b12c19d52246 /Build/source/libs/cairo/cairo-1.14.2/src/cairo-freed-pool-private.h | |
parent | d968be62390458d3c5f47f58517a50f34cc5f6c9 (diff) |
cairo 1.14.2
git-svn-id: svn://tug.org/texlive/trunk@36482 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/libs/cairo/cairo-1.14.2/src/cairo-freed-pool-private.h')
-rw-r--r-- | Build/source/libs/cairo/cairo-1.14.2/src/cairo-freed-pool-private.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/Build/source/libs/cairo/cairo-1.14.2/src/cairo-freed-pool-private.h b/Build/source/libs/cairo/cairo-1.14.2/src/cairo-freed-pool-private.h new file mode 100644 index 00000000000..0ec6de3d1f1 --- /dev/null +++ b/Build/source/libs/cairo/cairo-1.14.2/src/cairo-freed-pool-private.h @@ -0,0 +1,139 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2009 Chris Wilson + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is University of Southern + * California. + * + * Contributor(s): + * Chris Wilson <chris@chris-wilson.co.uk> + */ + +#ifndef CAIRO_FREED_POOL_H +#define CAIRO_FREED_POOL_H + +#include "cairoint.h" +#include "cairo-atomic-private.h" + +CAIRO_BEGIN_DECLS + +#define DISABLE_FREED_POOLS 0 + +#if HAS_ATOMIC_OPS && ! DISABLE_FREED_POOLS +/* Keep a stash of recently freed clip_paths, since we need to + * reallocate them frequently. + */ +#define MAX_FREED_POOL_SIZE 16 +typedef struct { + void *pool[MAX_FREED_POOL_SIZE]; + int top; +} freed_pool_t; + +static cairo_always_inline void * +_atomic_fetch (void **slot) +{ + void *ptr; + + do { + ptr = _cairo_atomic_ptr_get (slot); + } while (! _cairo_atomic_ptr_cmpxchg (slot, ptr, NULL)); + + return ptr; +} + +static cairo_always_inline cairo_bool_t +_atomic_store (void **slot, void *ptr) +{ + return _cairo_atomic_ptr_cmpxchg (slot, NULL, ptr); +} + +cairo_private void * +_freed_pool_get_search (freed_pool_t *pool); + +static inline void * +_freed_pool_get (freed_pool_t *pool) +{ + void *ptr; + int i; + + i = pool->top - 1; + if (i < 0) + i = 0; + + ptr = _atomic_fetch (&pool->pool[i]); + if (likely (ptr != NULL)) { + pool->top = i; + return ptr; + } + + /* either empty or contended */ + return _freed_pool_get_search (pool); +} + +cairo_private void +_freed_pool_put_search (freed_pool_t *pool, void *ptr); + +static inline void +_freed_pool_put (freed_pool_t *pool, void *ptr) +{ + int i; + + i = pool->top; + if (likely (i < ARRAY_LENGTH (pool->pool) && + _atomic_store (&pool->pool[i], ptr))) + { + pool->top = i + 1; + return; + } + + /* either full or contended */ + _freed_pool_put_search (pool, ptr); +} + +cairo_private void +_freed_pool_reset (freed_pool_t *pool); + +#define HAS_FREED_POOL 1 + +#else + +/* A warning about an unused freed-pool in a build without atomics + * enabled usually indicates a missing _freed_pool_reset() in the + * static reset function */ + +typedef int freed_pool_t; + +#define _freed_pool_get(pool) NULL +#define _freed_pool_put(pool, ptr) free(ptr) +#define _freed_pool_reset(ptr) + +#endif + +CAIRO_END_DECLS + +#endif /* CAIRO_FREED_POOL_PRIVATE_H */ |