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/*
* BIRD Library -- Locking
*
* (c) 2020--2021 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_LOCKING_H_
#define _BIRD_LOCKING_H_
struct domain_generic;
/* Here define the global lock order; first to last. */
struct lock_order {
struct domain_generic *the_bird;
};
extern _Thread_local struct lock_order locking_stack;
extern _Thread_local struct domain_generic **last_locked;
#define DOMAIN(type) struct domain__##type
#define DEFINE_DOMAIN(type) DOMAIN(type) { struct domain_generic *type; }
#define DOMAIN_NEW(type, name) (DOMAIN(type)) { .type = domain_new(name, OFFSETOF(struct lock_order, type)) }
struct domain_generic *domain_new(const char *name, uint order);
#define DOMAIN_NULL(type) (DOMAIN(type)) {}
#define LOCK_DOMAIN(type, d) do_lock(((d).type), &(locking_stack.type))
#define UNLOCK_DOMAIN(type, d) do_unlock(((d).type), &(locking_stack.type))
/* Internal for locking */
void do_lock(struct domain_generic *dg, struct domain_generic **lsp);
void do_unlock(struct domain_generic *dg, struct domain_generic **lsp);
/* Use with care. To be removed in near future. */
DEFINE_DOMAIN(the_bird);
extern DOMAIN(the_bird) the_bird_domain;
#define the_bird_lock() LOCK_DOMAIN(the_bird, the_bird_domain)
#define the_bird_unlock() UNLOCK_DOMAIN(the_bird, the_bird_domain)
#endif
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