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39 lines
849 B
C
39 lines
849 B
C
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#ifndef __XREF_H__
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#define __XREF_H__
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/* xref is used to create relation between two elements.
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* Once an element is released, it breaks the relation. If the
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* relation is already broken, it frees the xref struct.
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* The pointer between two elements is sort of a refcount with
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* max value 1. The relation is only between two elements.
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* The pointer and the type of elements a and b are conventional.
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*/
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struct xref {
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struct xref *peer;
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};
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static inline void xref_create(struct xref *xref_a, struct xref *xref_b)
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{
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xref_a->peer = xref_b;
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xref_b->peer = xref_a;
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}
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static inline struct xref *xref_get_peer(struct xref *xref)
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{
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if (!xref->peer)
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return NULL;
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return xref->peer;
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}
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static inline void xref_disconnect(struct xref *xref)
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{
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if (!xref->peer)
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return;
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xref->peer->peer = NULL;
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xref->peer = NULL;
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}
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#endif /* __XREF_H__ */
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