1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
32 #include "p_defines.h"
43 struct pipe_atomic count
;
48 pipe_reference_init(struct pipe_reference
*reference
, unsigned count
)
50 p_atomic_set(&reference
->count
, count
);
55 pipe_is_referenced(struct pipe_reference
*reference
)
57 return p_atomic_read(&reference
->count
) != 0;
62 * Set 'ptr' to point to 'reference' and update reference counting.
63 * The old thing pointed to, if any, will be unreferenced first.
64 * 'reference' may be NULL.
67 pipe_reference(struct pipe_reference
**ptr
, struct pipe_reference
*reference
)
71 if(*ptr
!= reference
) {
72 /* bump the reference.count first */
74 assert(pipe_is_referenced(reference
));
75 p_atomic_inc(&reference
->count
);
79 assert(pipe_is_referenced(*ptr
));
80 if (p_atomic_dec_zero(&(*ptr
)->count
)) {
96 #endif /* P_REFCNT_H */