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96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef P_REFCNT_H
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#define P_REFCNT_H
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#include "p_defines.h"
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#include "p_atomic.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct pipe_reference
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{
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struct pipe_atomic count;
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};
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static INLINE void
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pipe_reference_init(struct pipe_reference *reference, unsigned count)
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{
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p_atomic_set(&reference->count, count);
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}
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static INLINE bool
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pipe_is_referenced(struct pipe_reference *reference)
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{
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return p_atomic_read(&reference->count) != 0;
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}
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/**
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* Set 'ptr' to point to 'reference' and update reference counting.
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* The old thing pointed to, if any, will be unreferenced first.
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* 'reference' may be NULL.
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*/
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static INLINE bool
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pipe_reference(struct pipe_reference **ptr, struct pipe_reference *reference)
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{
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bool destroy = FALSE;
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if(*ptr != reference) {
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/* bump the reference.count first */
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if (reference) {
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assert(pipe_is_referenced(reference));
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p_atomic_inc(&reference->count);
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}
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if (*ptr) {
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assert(pipe_is_referenced(*ptr));
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if (p_atomic_dec_zero(&(*ptr)->count)) {
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destroy = TRUE;
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}
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}
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*ptr = reference;
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}
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return destroy;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* P_REFCNT_H */
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