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96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
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/*
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* BIRD Library -- Obstacle Keeper
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*
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* (c) 2024 CZ.NIC, z.s.p.o.
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* (c) 2024 Maria Matejka <mq@jmq.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_OBSTACLE_H_
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#define _BIRD_OBSTACLE_H_
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#include "lib/event.h"
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#include "lib/locking.h"
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#include "lib/tlists.h"
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#define TLIST_PREFIX obstacle
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#define TLIST_TYPE struct obstacle
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#define TLIST_ITEM n
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struct obstacle {
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TLIST_DEFAULT_NODE;
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};
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#define TLIST_WANT_ADD_TAIL
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#include "lib/tlists.h"
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struct obstacle_target {
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DOMAIN(resource) dom;
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TLIST_LIST(obstacle) obstacles;
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struct callback *done;
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};
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static inline void
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obstacle_put(struct obstacle_target *t, struct obstacle *o)
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{
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LOCK_DOMAIN(resource, t->dom);
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obstacle_add_tail(&t->obstacles, o);
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UNLOCK_DOMAIN(resource, t->dom);
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}
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static inline void
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obstacle_remove(struct obstacle *o)
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{
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SKIP_BACK_DECLARE(struct obstacle_target, t, obstacles, obstacle_enlisted(o));
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LOCK_DOMAIN(resource, t->dom);
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obstacle_rem_node(&t->obstacles, o);
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if (EMPTY_TLIST(obstacle, &t->obstacles))
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callback_activate(t->done);
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UNLOCK_DOMAIN(resource, t->dom);
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}
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static inline void
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obstacle_target_init(struct obstacle_target *t, struct callback *done, pool *p, const char *fmt, ...)
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{
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t->dom = DOMAIN_NEW(resource);
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va_list args;
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va_start(args, fmt);
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DOMAIN_SETUP(resource, t->dom, mb_vsprintf(p, fmt, args), p);
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va_end(args);
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t->obstacles = (struct obstacle_list) {};
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t->done = done;
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}
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static inline uint
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obstacle_target_count(struct obstacle_target *t)
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{
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LOCK_DOMAIN(resource, t->dom);
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uint len = TLIST_LENGTH(obstacle, &t->obstacles);
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UNLOCK_DOMAIN(resource, t->dom);
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return len;
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}
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#define OBSREF(_type) struct { _type *ref; struct obstacle o; }
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#define OBSREF_SET(_ref, _val) ({ \
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typeof (_ref) *_r = &(_ref); \
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typeof (_val) _v = (_val); \
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ASSERT_DIE(_r->ref == NULL); \
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obstacle_put(&_v->obstacles, &_r->o); \
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_r->ref = _v; \
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})
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#define OBSREF_CLEAR(_ref) ({ \
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typeof (_ref) *_r = &(_ref); \
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if (_r->ref) { \
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obstacle_remove(&_r->o); \
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_r->ref = NULL; \
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}})
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#define OBSREF_GET(_ref) ((_ref).ref)
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#endif
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