mirror of
https://gitlab.nic.cz/labs/bird.git
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84c298465f
On large configurations, too many threads would spawn with one thread per loop. Therefore, threads may now run multiple loops at once. The thread count is configurable and may be changed during run. All threads are spawned on startup. This change helps with memory bloating. BIRD filters need large temporary memory blocks to store their stack and also memory management keeps its hot page storage per-thread. Known bugs: * Thread autobalancing is not yet implemented. * Low latency loops are executed together with standard loops.
123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/*
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* BIRD Locking
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*
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* (c) 2020 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 _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#undef LOCAL_DEBUG
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#undef DEBUG_LOCKING
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#include "lib/birdlib.h"
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#include "lib/locking.h"
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#include "lib/resource.h"
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#include "lib/timer.h"
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#include "conf/conf.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <stdatomic.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* Locking subsystem
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*/
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_Thread_local struct lock_order locking_stack = {};
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_Thread_local struct domain_generic **last_locked = NULL;
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#define ASSERT_NO_LOCK ASSERT_DIE(last_locked == NULL)
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struct domain_generic {
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pthread_mutex_t mutex;
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uint order;
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struct domain_generic **prev;
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struct lock_order *locked_by;
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const char *name;
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};
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#define DOMAIN_INIT(_name, _order) { .mutex = PTHREAD_MUTEX_INITIALIZER, .name = _name, .order = _order }
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static struct domain_generic the_bird_domain_gen = DOMAIN_INIT("The BIRD", OFFSETOF(struct lock_order, the_bird));
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DOMAIN(the_bird) the_bird_domain = { .the_bird = &the_bird_domain_gen };
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struct domain_generic *
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domain_new(const char *name, uint order)
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{
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ASSERT_DIE(order < sizeof(struct lock_order));
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struct domain_generic *dg = xmalloc(sizeof(struct domain_generic));
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*dg = (struct domain_generic) DOMAIN_INIT(name, order);
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return dg;
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}
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void
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domain_free(struct domain_generic *dg)
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{
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pthread_mutex_destroy(&dg->mutex);
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xfree(dg);
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}
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const char *
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domain_name(struct domain_generic *dg)
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{
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return dg->name;
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}
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uint dg_order(struct domain_generic *dg)
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{
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return dg->order;
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}
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void do_lock(struct domain_generic *dg, struct domain_generic **lsp)
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{
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if ((char *) lsp - (char *) &locking_stack != dg->order)
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bug("Trying to lock on bad position: order=%u, lsp=%p, base=%p", dg->order, lsp, &locking_stack);
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if (lsp <= last_locked)
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bug("Trying to lock in a bad order");
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if (*lsp)
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bug("Inconsistent locking stack state on lock");
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btime lock_begin = current_time();
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pthread_mutex_lock(&dg->mutex);
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btime duration = current_time() - lock_begin;
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if (config && (duration > config->watchdog_warning))
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log(L_WARN "Locking of %s took %d ms", dg->name, (int) (duration TO_MS));
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if (dg->prev || dg->locked_by)
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bug("Previous unlock not finished correctly");
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dg->prev = last_locked;
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*lsp = dg;
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last_locked = lsp;
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dg->locked_by = &locking_stack;
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}
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void do_unlock(struct domain_generic *dg, struct domain_generic **lsp)
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{
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if ((char *) lsp - (char *) &locking_stack != dg->order)
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bug("Trying to unlock on bad position: order=%u, lsp=%p, base=%p", dg->order, lsp, &locking_stack);
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if (dg->locked_by != &locking_stack)
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bug("Inconsistent domain state on unlock");
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if ((last_locked != lsp) || (*lsp != dg))
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bug("Inconsistent locking stack state on unlock");
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dg->locked_by = NULL;
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last_locked = dg->prev;
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*lsp = NULL;
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dg->prev = NULL;
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pthread_mutex_unlock(&dg->mutex);
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}
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