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https://gitlab.nic.cz/labs/bird.git
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427177edb7
The original logging routines were locking a common mutex. This led to massive underperformance and unwanted serialization when heavily logging due to lock contention. Now the logging is lockless, though still serializing on write() syscalls to the same filedescriptor. This change also brings in a persistent logging channel structures and thus avoids writing into active configuration data structures during regular run.
76 lines
2.5 KiB
C
76 lines
2.5 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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struct pool;
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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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struct domain_generic *meta;
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struct domain_generic *control;
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struct domain_generic *proto;
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struct domain_generic *service;
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struct domain_generic *rtable;
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struct domain_generic *attrs;
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struct domain_generic *logging;
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struct domain_generic *resource;
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};
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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_ORDER(type) OFFSETOF(struct lock_order, type)
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#define DOMAIN_NEW(type) (DOMAIN(type)) { .type = domain_new(DOMAIN_ORDER(type)) }
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struct domain_generic *domain_new(uint order);
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#define DOMAIN_FREE(type, d) domain_free((d).type)
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void domain_free(struct domain_generic *);
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#define DOMAIN_NAME(type, d) domain_name((d).type)
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const char *domain_name(struct domain_generic *);
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#define DOMAIN_SETUP(type, d, n, p) domain_setup((d).type, n, p)
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void domain_setup(struct domain_generic *, const char *name, struct pool *);
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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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#define DOMAIN_IS_LOCKED(type, d) (((d).type) == (locking_stack.type))
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#define DG_IS_LOCKED(d) ((d) == *(DG_LSP(d)))
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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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uint dg_order(struct domain_generic *dg);
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#define DG_LSP(d) ((struct domain_generic **) (((void *) &locking_stack) + dg_order(d)))
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#define DG_LOCK(d) do_lock(d, DG_LSP(d))
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#define DG_UNLOCK(d) do_unlock(d, DG_LSP(d))
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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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#define the_bird_locked() DOMAIN_IS_LOCKED(the_bird, the_bird_domain)
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#define ASSERT_THE_BIRD_LOCKED ({ if (!the_bird_locked()) bug("The BIRD lock must be locked here: %s:%d", __FILE__, __LINE__); })
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#endif
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