blob: 68e0fd4b005ebb1f514c921344f315215319a616 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
#ifndef _GPXE_REFCNT_H
#define _GPXE_REFCNT_H
/** @file
*
* Reference counting
*
*/
/**
* A reference counter
*
* This data structure is designed to be embedded within a
* reference-counted object.
*
* Reference-counted objects are freed when their reference count
* drops below zero. This means that a freshly allocated-and-zeroed
* reference-counted object will be freed on the first call to
* ref_put().
*/
struct refcnt {
/** Current reference count
*
* When this count is decremented below zero, the free()
* method will be called.
*/
int refcnt;
/** Free containing object
*
* This method is called when the reference count is
* decremented below zero.
*
* If this method is left NULL, the standard library free()
* function will be called. The upshot of this is that you
* may omit the free() method if the @c refcnt object is the
* first element of your reference-counted struct.
*/
void ( * free ) ( struct refcnt *refcnt );
};
extern struct refcnt * ref_get ( struct refcnt *refcnt );
extern void ref_put ( struct refcnt *refcnt );
#endif /* _GPXE_REFCNT_H */
|
