98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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#if HAS_ATOMIC_OPS
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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 4
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typedef struct {
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void *pool[MAX_FREED_POOL_SIZE];
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cairo_atomic_int_t 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 = _cairo_atomic_int_get_relaxed (&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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_cairo_atomic_int_set_relaxed (&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 = _cairo_atomic_int_get_relaxed (&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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_cairo_atomic_int_set_relaxed (&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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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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#endif /* CAIRO_FREED_POOL_PRIVATE_H */
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