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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;
struct domain_generic *meta;
struct domain_generic *control;
struct domain_generic *proto;
struct domain_generic *service;
struct domain_generic *rtable;
struct domain_generic *attrs;
struct domain_generic *resource;
};
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_ORDER(type) OFFSETOF(struct lock_order, type)
#define DOMAIN_NEW(type, name) (DOMAIN(type)) { .type = domain_new(name, DOMAIN_ORDER(type)) }
struct domain_generic *domain_new(const char *name, uint order);
#define DOMAIN_FREE(type, d) domain_free((d).type)
void domain_free(struct domain_generic *);
#define DOMAIN_NAME(type, d) domain_name((d).type)
const char *domain_name(struct domain_generic *);
#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))
#define DOMAIN_IS_LOCKED(type, d) (((d).type) == (locking_stack.type))
#define DG_IS_LOCKED(d) ((d) == *(DG_LSP(d)))
/* 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);
uint dg_order(struct domain_generic *dg);
#define DG_LSP(d) ((struct domain_generic **) (((void *) &locking_stack) + dg_order(d)))
#define DG_LOCK(d) do_lock(d, DG_LSP(d))
#define DG_UNLOCK(d) do_unlock(d, DG_LSP(d))
/* 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)
#define the_bird_locked() DOMAIN_IS_LOCKED(the_bird, the_bird_domain)
#define ASSERT_THE_BIRD_LOCKED ({ if (!the_bird_locked()) bug("The BIRD lock must be locked here: %s:%d", __FILE__, __LINE__); })
#endif
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