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Config obstacles are lockless now

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This commit is contained in:
Maria Matejka 2023-08-21 15:37:09 +02:00
parent 5ba9878b4f
commit 7776e47e32
2 changed files with 12 additions and 10 deletions
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19
conf/conf.c
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@ -70,7 +70,7 @@ static int future_cftype; /* Type of scheduled transition, may also be RECONFIG
/* Note that when future_cftype is RECONFIG_UNDO, then future_config is NULL, /* Note that when future_cftype is RECONFIG_UNDO, then future_config is NULL,
therefore proper check for future scheduled config checks future_cftype */ therefore proper check for future scheduled config checks future_cftype */
static event *config_event; /* Event for finalizing reconfiguration */ static void config_done(void *cf);
static timer *config_timer; /* Timer for scheduled configuration rollback */ static timer *config_timer; /* Timer for scheduled configuration rollback */
/* These are public just for cmd_show_status(), should not be accessed elsewhere */ /* These are public just for cmd_show_status(), should not be accessed elsewhere */
@ -110,6 +110,8 @@ config_alloc(const char *name)
c->tf_base = c->tf_log = TM_ISO_LONG_MS; c->tf_base = c->tf_log = TM_ISO_LONG_MS;
c->gr_wait = DEFAULT_GR_WAIT; c->gr_wait = DEFAULT_GR_WAIT;
c->done_event = (event) { .hook = config_done, .data = c, };
return c; return c;
} }
@ -228,16 +230,15 @@ void
config_add_obstacle(struct config *c) config_add_obstacle(struct config *c)
{ {
DBG("+++ adding obstacle %d\n", c->obstacle_count); DBG("+++ adding obstacle %d\n", c->obstacle_count);
c->obstacle_count++; atomic_fetch_add_explicit(&c->obstacle_count, 1, memory_order_acq_rel);
} }
void void
config_del_obstacle(struct config *c) config_del_obstacle(struct config *c)
{ {
DBG("+++ deleting obstacle %d\n", c->obstacle_count); DBG("+++ deleting obstacle %d\n", c->obstacle_count);
c->obstacle_count--; if (atomic_fetch_sub_explicit(&c->obstacle_count, 1, memory_order_acq_rel) == 1)
if (!c->obstacle_count && (c != config)) ev_send_loop(&main_birdloop, &c->done_event);
ev_schedule(config_event);
} }
static int static int
@ -313,8 +314,11 @@ config_do_commit(struct config *c, int type)
} }
static void static void
config_done(void *unused UNUSED) config_done(void *cf)
{ {
if (cf == config)
return;
if (config->shutdown) if (config->shutdown)
sysdep_shutdown_done(); sysdep_shutdown_done();
@ -517,9 +521,6 @@ config_init(void)
{ {
config_pool = rp_new(&root_pool, the_bird_domain.the_bird, "Configurations"); config_pool = rp_new(&root_pool, the_bird_domain.the_bird, "Configurations");
config_event = ev_new(config_pool);
config_event->hook = config_done;
config_timer = tm_new(config_pool); config_timer = tm_new(config_pool);
config_timer->hook = config_timeout; config_timer->hook = config_timeout;
} }

3
conf/conf.h
View File

@ -57,7 +57,8 @@ struct config {
int thread_count; /* How many worker threads to prefork */ int thread_count; /* How many worker threads to prefork */
struct sym_scope *root_scope; /* Scope for root symbols */ struct sym_scope *root_scope; /* Scope for root symbols */
int obstacle_count; /* Number of items blocking freeing of this config */ _Atomic int obstacle_count; /* Number of items blocking freeing of this config */
event done_event; /* Called when obstacle_count reaches zero */
int shutdown; /* This is a pseudo-config for daemon shutdown */ int shutdown; /* This is a pseudo-config for daemon shutdown */
int gr_down; /* This is a pseudo-config for graceful restart */ int gr_down; /* This is a pseudo-config for graceful restart */
btime load_time; /* When we've got this configuration */ btime load_time; /* When we've got this configuration */