C++ DESTROYLOCK函数代码示例

void
isc_stats_detach(isc_stats_t **statsp) {
	isc_stats_t *stats;

	REQUIRE(statsp != NULL && ISC_STATS_VALID(*statsp));

	stats = *statsp;
	*statsp = NULL;

	LOCK(&stats->lock);
	stats->references--;
	UNLOCK(&stats->lock);

	if (stats->references == 0) {
		isc_mem_put(stats->mctx, stats->copiedcounters,
			    sizeof(isc_stat_t) * stats->ncounters);
		isc_mem_put(stats->mctx, stats->counters,
			    sizeof(isc_stat_t) * stats->ncounters);
		DESTROYLOCK(&stats->lock);
#ifdef ISC_RWLOCK_USEATOMIC
		isc_rwlock_destroy(&stats->counterlock);
#endif
		isc_mem_putanddetach(&stats->mctx, stats, sizeof(*stats));
	}
}

/*
 * Called when bind is shutting down
 */
static void
dlopen_dlz_destroy(void *driverarg, void *dbdata) {
	dlopen_data_t *cd = (dlopen_data_t *) dbdata;
	isc_mem_t *mctx;

	UNUSED(driverarg);

	if (cd->dlz_destroy) {
		MAYBE_LOCK(cd);
		cd->dlz_destroy(cd->dbdata);
		MAYBE_UNLOCK(cd);
	}

	if (cd->dl_path)
		isc_mem_free(cd->mctx, cd->dl_path);
	if (cd->dlzname)
		isc_mem_free(cd->mctx, cd->dlzname);

	if (cd->dl_handle)
		FreeLibrary(cd->dl_handle);

	DESTROYLOCK(&cd->lock);

	mctx = cd->mctx;
	isc_mem_put(mctx, cd, sizeof(*cd));
	isc_mem_destroy(&mctx);
}

static void
destroy(isc_hash_t **hctxp) {
	isc_hash_t *hctx;
	isc_mem_t *mctx;
	unsigned char canary0[4], canary1[4];

	REQUIRE(hctxp != NULL && *hctxp != NULL);
	hctx = *hctxp;
	*hctxp = NULL;

	LOCK(&hctx->lock);

	isc_refcount_destroy(&hctx->refcnt);

	mctx = hctx->mctx;
#ifdef BIND9
	if (hctx->entropy != NULL)
		isc_entropy_detach(&hctx->entropy);
#endif
	if (hctx->rndvector != NULL)
		isc_mem_put(mctx, hctx->rndvector, hctx->vectorlen);

	UNLOCK(&hctx->lock);

	DESTROYLOCK(&hctx->lock);

	memcpy(canary0, hctx + 1, sizeof(canary0));
	memset(hctx, 0, sizeof(isc_hash_t));
	memcpy(canary1, hctx + 1, sizeof(canary1));
	INSIST(memcmp(canary0, canary1, sizeof(canary0)) == 0);
	isc_mem_put(mctx, hctx, sizeof(isc_hash_t));
	isc_mem_detach(&mctx);
}

static void
ns_interface_destroy(ns_interface_t *ifp) {
	isc_mem_t *mctx = ifp->mgr->mctx;
	int disp;

	REQUIRE(NS_INTERFACE_VALID(ifp));

	ns_interface_shutdown(ifp);

	for (disp = 0; disp < ifp->nudpdispatch; disp++)
		if (ifp->udpdispatch[disp] != NULL) {
			dns_dispatch_changeattributes(ifp->udpdispatch[disp], 0,
						    DNS_DISPATCHATTR_NOLISTEN);
			dns_dispatch_detach(&(ifp->udpdispatch[disp]));
		}

	if (ifp->tcpsocket != NULL)
		isc_socket_detach(&ifp->tcpsocket);

	DESTROYLOCK(&ifp->lock);

	ns_interfacemgr_detach(&ifp->mgr);

	ifp->magic = 0;
	isc_mem_put(mctx, ifp, sizeof(*ifp));
}

static void
task_finished(isc__task_t *task) {
	isc__taskmgr_t *manager = task->manager;

	REQUIRE(EMPTY(task->events));
	REQUIRE(EMPTY(task->on_shutdown));
	REQUIRE(task->references == 0);
	REQUIRE(task->state == task_state_done);

	XTRACE("task_finished");

	LOCK(&manager->lock);
	UNLINK(manager->tasks, task, link);
#ifdef USE_WORKER_THREADS
	if (FINISHED(manager)) {
		/*
		 * All tasks have completed and the
		 * task manager is exiting.  Wake up
		 * any idle worker threads so they
		 * can exit.
		 */
		BROADCAST(&manager->work_available);
	}
#endif /* USE_WORKER_THREADS */
	UNLOCK(&manager->lock);

	DESTROYLOCK(&task->lock);
	task->common.impmagic = 0;
	task->common.magic = 0;
	isc_mem_put(manager->mctx, task, sizeof(*task));
}

static inline void
destroy(dns_ssutable_t *table) {
	isc_mem_t *mctx;

	REQUIRE(VALID_SSUTABLE(table));

	mctx = table->mctx;
	while (!ISC_LIST_EMPTY(table->rules)) {
		dns_ssurule_t *rule = ISC_LIST_HEAD(table->rules);
		if (rule->identity != NULL) {
			dns_name_free(rule->identity, mctx);
			isc_mem_put(mctx, rule->identity, sizeof(dns_name_t));
		}
		if (rule->name != NULL) {
			dns_name_free(rule->name, mctx);
			isc_mem_put(mctx, rule->name, sizeof(dns_name_t));
		}
		if (rule->types != NULL)
			isc_mem_put(mctx, rule->types,
				    rule->ntypes * sizeof(dns_rdatatype_t));
		ISC_LIST_UNLINK(table->rules, rule, link);
		rule->magic = 0;
		isc_mem_put(mctx, rule, sizeof(dns_ssurule_t));
	}
	DESTROYLOCK(&table->lock);
	table->magic = 0;
	isc_mem_putanddetach(&table->mctx, table, sizeof(dns_ssutable_t));
}

static void
destroy(isc_hash_t **hctxp) {
	isc_hash_t *hctx;
	isc_mem_t *mctx;

	REQUIRE(hctxp != NULL && *hctxp != NULL);
	hctx = *hctxp;
	*hctxp = NULL;

	LOCK(&hctx->lock);

	isc_refcount_destroy(&hctx->refcnt);

	mctx = hctx->mctx;
	if (hctx->entropy != NULL)
		isc_entropy_detach(&hctx->entropy);
	if (hctx->rndvector != NULL)
		isc_mem_put(mctx, hctx->rndvector, hctx->vectorlen);

	UNLOCK(&hctx->lock);

	DESTROYLOCK(&hctx->lock);

	memset(hctx, 0, sizeof(isc_hash_t));
	isc_mem_put(mctx, hctx, sizeof(isc_hash_t));
	isc_mem_detach(&mctx);
}

static void
destroy(isc__timer_t *timer) {
	isc__timermgr_t *manager = timer->manager;

	/*
	 * The caller must ensure it is safe to destroy the timer.
	 */

	LOCK(&manager->lock);

	(void)isc_task_purgerange(timer->task,
				  timer,
				  ISC_TIMEREVENT_FIRSTEVENT,
				  ISC_TIMEREVENT_LASTEVENT,
				  NULL);
	deschedule(timer);
	UNLINK(manager->timers, timer, link);

	UNLOCK(&manager->lock);

	isc_task_detach(&timer->task);
	DESTROYLOCK(&timer->lock);
	timer->common.impmagic = 0;
	timer->common.magic = 0;
	isc_mem_put(manager->mctx, timer, sizeof(*timer));
}

/**
 * Free dynamically allocated memory associated with given set of settings.
 * @pre *set is initialized set of settings, set != NULL && *set != NULL
 * @post *set == NULL
 */
void
settings_set_free(settings_set_t **set) {
	isc_mem_t *mctx = NULL;
	setting_t *s = NULL;

	if (set == NULL || *set == NULL)
		return;

	if ((*set)->mctx != NULL) {
		mctx = (*set)->mctx;

		if ((*set)->lock != NULL) {
			DESTROYLOCK((*set)->lock);
			SAFE_MEM_PUT_PTR(mctx, (*set)->lock);
		}

		for (s = (*set)->first_setting; s->name != NULL; s++) {
			if (s->is_dynamic)
				isc_mem_free(mctx, s->value.value_char);
		}
		if ((*set)->first_setting != NULL)
			isc_mem_free(mctx, (*set)->first_setting);
		isc_mem_free(mctx, (*set)->name);
		isc_mem_free(mctx, *set);
		isc_mem_detach(&mctx);
	}

	*set = NULL;
}

void
dns_keytable_detach(dns_keytable_t **keytablep) {
	isc_boolean_t destroy = ISC_FALSE;
	dns_keytable_t *keytable;

	/*
	 * Detach *keytablep from its keytable.
	 */

	REQUIRE(keytablep != NULL && VALID_KEYTABLE(*keytablep));

	keytable = *keytablep;

	RWLOCK(&keytable->rwlock, isc_rwlocktype_write);

	INSIST(keytable->references > 0);
	keytable->references--;
	LOCK(&keytable->lock);
	if (keytable->references == 0 && keytable->active_nodes == 0)
		destroy = ISC_TRUE;
	UNLOCK(&keytable->lock);

	RWUNLOCK(&keytable->rwlock, isc_rwlocktype_write);

	if (destroy) {
		dns_rbt_destroy(&keytable->table);
		isc_rwlock_destroy(&keytable->rwlock);
		DESTROYLOCK(&keytable->lock);
		keytable->magic = 0;
		isc_mem_putanddetach(&keytable->mctx,
				     keytable, sizeof(*keytable));
	}

	*keytablep = NULL;
}

void
isc_quota_destroy(isc_quota_t *quota) {
    INSIST(quota->used == 0);
    quota->max = -1;
    quota->used = -1;
    quota->soft = ISC_FALSE;
    DESTROYLOCK(&quota->lock);
}

void
isc_quota_destroy(isc_quota_t *quota) {
	INSIST(quota->used == 0);
	quota->max = 0;
	quota->used = 0;
	quota->soft = 0;
	DESTROYLOCK(&quota->lock);
}

ISC_APPFUNC_SCOPE void
isc__app_ctxfinish(isc_appctx_t *ctx0) {
	isc__appctx_t *ctx = (isc__appctx_t *)ctx0;

	REQUIRE(VALID_APPCTX(ctx));

	DESTROYLOCK(&ctx->lock);
}

ISC_TASKFUNC_SCOPE isc_result_t
isc__task_create(isc_taskmgr_t *manager0, unsigned int quantum,
		 isc_task_t **taskp)
{
	isc__taskmgr_t *manager = (isc__taskmgr_t *)manager0;
	isc__task_t *task;
	isc_boolean_t exiting;
	isc_result_t result;

	REQUIRE(VALID_MANAGER(manager));
	REQUIRE(taskp != NULL && *taskp == NULL);

	task = isc_mem_get(manager->mctx, sizeof(*task));
	if (task == NULL)
		return (ISC_R_NOMEMORY);
	XTRACE("isc_task_create");
	task->manager = manager;
	result = isc_mutex_init(&task->lock);
	if (result != ISC_R_SUCCESS) {
		isc_mem_put(manager->mctx, task, sizeof(*task));
		return (result);
	}
	task->state = task_state_idle;
	task->references = 1;
	INIT_LIST(task->events);
	INIT_LIST(task->on_shutdown);
	task->quantum = quantum;
	task->flags = 0;
	task->now = 0;
	memset(task->name, 0, sizeof(task->name));
	task->tag = NULL;
	INIT_LINK(task, link);
	INIT_LINK(task, ready_link);
	INIT_LINK(task, ready_priority_link);

	exiting = ISC_FALSE;
	LOCK(&manager->lock);
	if (!manager->exiting) {
		if (task->quantum == 0)
			task->quantum = manager->default_quantum;
		APPEND(manager->tasks, task, link);
	} else
		exiting = ISC_TRUE;
	UNLOCK(&manager->lock);

	if (exiting) {
		DESTROYLOCK(&task->lock);
		isc_mem_put(manager->mctx, task, sizeof(*task));
		return (ISC_R_SHUTTINGDOWN);
	}

	task->common.methods = (isc_taskmethods_t *)&taskmethods;
	task->common.magic = ISCAPI_TASK_MAGIC;
	task->common.impmagic = TASK_MAGIC;
	*taskp = (isc_task_t *)task;

	return (ISC_R_SUCCESS);
}

static void
ns_interfacemgr_destroy(ns_interfacemgr_t *mgr) {
	REQUIRE(NS_INTERFACEMGR_VALID(mgr));
	dns_aclenv_destroy(&mgr->aclenv);
	ns_listenlist_detach(&mgr->listenon4);
	ns_listenlist_detach(&mgr->listenon6);
	clearlistenon(mgr);
	DESTROYLOCK(&mgr->lock);
	mgr->magic = 0;
	isc_mem_putanddetach(&mgr->mctx, mgr, sizeof(*mgr));
}