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47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/*
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* BIRD Library -- Locking
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*
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* (c) 2020--2021 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_LOCKING_H_
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#define _BIRD_LOCKING_H_
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struct domain_generic;
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/* Here define the global lock order; first to last. */
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struct lock_order {
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struct domain_generic *the_bird;
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};
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#define LOCK_ORDER_DEPTH (sizeof(struct lock_order) / sizeof(struct domain_generic *))
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extern _Thread_local struct lock_order locking_stack;
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extern _Thread_local struct domain_generic **last_locked;
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#define DOMAIN(type) struct domain__##type
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#define DEFINE_DOMAIN(type) DOMAIN(type) { struct domain_generic *type; }
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#define DOMAIN_NEW(type, name) (DOMAIN(type)) { .type = domain_new(name) }
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struct domain_generic *domain_new(const char *name);
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#define DOMAIN_NULL(type) (DOMAIN(type)) {}
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#define LOCK_DOMAIN(type, d) do_lock(((d).type), &(locking_stack.type))
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#define UNLOCK_DOMAIN(type, d) do_unlock(((d).type), &(locking_stack.type))
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/* Internal for locking */
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void do_lock(struct domain_generic *dg, struct domain_generic **lsp);
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void do_unlock(struct domain_generic *dg, struct domain_generic **lsp);
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/* Use with care. To be removed in near future. */
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DEFINE_DOMAIN(the_bird);
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extern DOMAIN(the_bird) the_bird_domain;
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#define the_bird_lock() LOCK_DOMAIN(the_bird, the_bird_domain)
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#define the_bird_unlock() UNLOCK_DOMAIN(the_bird, the_bird_domain)
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#endif
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