1 files changed, 139 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/src/cairo-freed-pool-private.h b/libs/cairo-1.16.0/src/cairo-freed-pool-private.h
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+++ b/libs/cairo-1.16.0/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];
+    cairo_atomic_int_t 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 = _cairo_atomic_int_get_relaxed (&pool->top) - 1;
+    if (i < 0)
+	i = 0;
+
+    ptr = _atomic_fetch (&pool->pool[i]);
+    if (likely (ptr != NULL)) {
+	_cairo_atomic_int_set_relaxed (&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 = _cairo_atomic_int_get_relaxed (&pool->top);
+    if (likely (i < ARRAY_LENGTH (pool->pool) &&
+		_atomic_store (&pool->pool[i], ptr)))
+    {
+	_cairo_atomic_int_set_relaxed (&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 */