context.c

	}
	if (lws_context_init_client_ssl(info, vh)) {
		lwsl_err("%s: lws_context_init_client_ssl failed\n", __func__);
		goto bail1;
	}
	lws_context_lock(context, "create_vhost");
	n = _lws_vhost_init_server(info, vh);
	lws_context_unlock(context);
	if (n < 0) {
		lwsl_err("init server failed\n");
		goto bail1;
	}


	while (1) {
		if (!(*vh1)) {
			*vh1 = vh;
			break;
		}
		vh1 = &(*vh1)->vhost_next;
	};

	/* for the case we are adding a vhost much later, after server init */

	if (context->protocol_init_done)
		if (lws_protocol_init(context)) {
			lwsl_err("%s: lws_protocol_init failed\n", __func__);
			goto bail1;
		}

	return vh;

bail1:
	lws_vhost_destroy(vh);

	return NULL;

#ifdef LWS_WITH_ACCESS_LOG
bail:
	lws_free(vh);
#endif

	return NULL;
}

LWS_VISIBLE int
lws_init_vhost_client_ssl(const struct lws_context_creation_info *info,
			  struct lws_vhost *vhost)
{
	struct lws_context_creation_info i;

	memcpy(&i, info, sizeof(i));
	i.port = CONTEXT_PORT_NO_LISTEN;

	return lws_context_init_client_ssl(&i, vhost);
}

LWS_VISIBLE void
lws_cancel_service_pt(struct lws *wsi)
{
	lws_plat_pipe_signal(wsi);
}

LWS_VISIBLE void
lws_cancel_service(struct lws_context *context)
{
	struct lws_context_per_thread *pt = &context->pt[0];
	short m = context->count_threads;

	if (context->being_destroyed1)
		return;

	lwsl_info("%s\n", __func__);

	while (m--) {
		if (pt->pipe_wsi)
			lws_plat_pipe_signal(pt->pipe_wsi);
		pt++;
	}
}

int
lws_create_event_pipes(struct lws_context *context)
{
	struct lws *wsi;
	int n;

	/*
	 * Create the pt event pipes... these are unique in that they are
	 * not bound to a vhost or protocol (both are NULL)
	 */

	for (n = 0; n < context->count_threads; n++) {
		if (context->pt[n].pipe_wsi)
			continue;

		wsi = lws_zalloc(sizeof(*wsi), "event pipe wsi");
		if (!wsi) {
			lwsl_err("Out of mem\n");
			return 1;
		}
		wsi->context = context;
		lws_role_transition(wsi, 0, LRS_UNCONNECTED, &role_ops_pipe);
		wsi->protocol = NULL;
		wsi->tsi = n;
		wsi->vhost = NULL;
		wsi->event_pipe = 1;
		wsi->desc.sockfd = LWS_SOCK_INVALID;
		context->pt[n].pipe_wsi = wsi;
		context->count_wsi_allocated++;

		if (lws_plat_pipe_create(wsi))
			/*
			 * platform code returns 0 if it actually created pipes
			 * and initialized pt->dummy_pipe_fds[].  If it used
			 * some other mechanism outside of signaling in the
			 * normal event loop, we skip treating the pipe as
			 * related to dummy_pipe_fds[], adding it to the fds,
			 * etc.
			 */
			continue;

		wsi->desc.sockfd = context->pt[n].dummy_pipe_fds[0];
		lwsl_debug("event pipe fd %d\n", wsi->desc.sockfd);

		if (context->event_loop_ops->accept)
			context->event_loop_ops->accept(wsi);

		if (__insert_wsi_socket_into_fds(context, wsi))
			return 1;
	}

	return 0;
}

void
lws_destroy_event_pipe(struct lws *wsi)
{
	lwsl_info("%s\n", __func__);
	__remove_wsi_socket_from_fds(wsi);

	if (wsi->context->event_loop_ops->wsi_logical_close) {
		wsi->context->event_loop_ops->wsi_logical_close(wsi);
		lws_plat_pipe_close(wsi);
		return;
	}

	if (wsi->context->event_loop_ops->destroy_wsi)
		wsi->context->event_loop_ops->destroy_wsi(wsi);
	lws_plat_pipe_close(wsi);
	wsi->context->count_wsi_allocated--;
	lws_free(wsi);
}

LWS_VISIBLE struct lws_context *
lws_create_context(const struct lws_context_creation_info *info)
{
	struct lws_context *context = NULL;
	struct lws_plat_file_ops *prev;
#ifndef LWS_NO_DAEMONIZE
	int pid_daemon = get_daemonize_pid();
#endif
	int n;
#if defined(__ANDROID__)
	struct rlimit rt;
#endif



	lwsl_info("Initial logging level %d\n", log_level);
	lwsl_info("Libwebsockets version: %s\n", library_version);
#if defined(GCC_VER)
	lwsl_info("Compiled with  %s\n", GCC_VER);
#endif

#ifdef LWS_WITH_IPV6
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
		lwsl_info("IPV6 compiled in and enabled\n");
	else
		lwsl_info("IPV6 compiled in but disabled\n");
#else
	lwsl_info("IPV6 not compiled in\n");
#endif

	lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
	lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
	lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
	lwsl_info(" sizeof (*info)        : %ld\n", (long)sizeof(*info));
#if defined(LWS_WITH_STATS)
	lwsl_info(" LWS_WITH_STATS        : on\n");
#endif
	lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
#if defined(LWS_WITH_HTTP2)
	lwsl_info(" HTTP2 support         : available\n");
#else
	lwsl_info(" HTTP2 support         : not configured\n");
#endif
	if (lws_plat_context_early_init())
		return NULL;

	context = lws_zalloc(sizeof(struct lws_context), "context");
	if (!context) {
		lwsl_err("No memory for websocket context\n");
		return NULL;
	}

#if defined(LWS_WITH_TLS)
#if defined(LWS_WITH_MBEDTLS)
	context->tls_ops = &tls_ops_mbedtls;
#else
	context->tls_ops = &tls_ops_openssl;
#endif
#endif

	if (info->pt_serv_buf_size)
		context->pt_serv_buf_size = info->pt_serv_buf_size;
	else
		context->pt_serv_buf_size = 4096;

#if defined(LWS_ROLE_H2)
	role_ops_h2.init_context(context, info);
#endif

#if LWS_MAX_SMP > 1
	lws_mutex_refcount_init(&context->mr);
#endif

#if defined(LWS_WITH_ESP32)
	context->last_free_heap = esp_get_free_heap_size();
#endif

	/* default to just the platform fops implementation */

	context->fops_platform.LWS_FOP_OPEN	= _lws_plat_file_open;
	context->fops_platform.LWS_FOP_CLOSE	= _lws_plat_file_close;
	context->fops_platform.LWS_FOP_SEEK_CUR	= _lws_plat_file_seek_cur;
	context->fops_platform.LWS_FOP_READ	= _lws_plat_file_read;
	context->fops_platform.LWS_FOP_WRITE	= _lws_plat_file_write;
	context->fops_platform.fi[0].sig	= NULL;

	/*
	 *  arrange a linear linked-list of fops starting from context->fops
	 *
	 * platform fops
	 * [ -> fops_zip (copied into context so .next settable) ]
	 * [ -> info->fops ]
	 */

	context->fops = &context->fops_platform;
	prev = (struct lws_plat_file_ops *)context->fops;

#if defined(LWS_WITH_ZIP_FOPS)
	/* make a soft copy so we can set .next */
	context->fops_zip = fops_zip;
	prev->next = &context->fops_zip;
	prev = (struct lws_plat_file_ops *)prev->next;
#endif

	/* if user provided fops, tack them on the end of the list */
	if (info->fops)
		prev->next = info->fops;

	context->reject_service_keywords = info->reject_service_keywords;
	if (info->external_baggage_free_on_destroy)
		context->external_baggage_free_on_destroy =
			info->external_baggage_free_on_destroy;

	context->time_up = time(NULL);
	context->pcontext_finalize = info->pcontext;

	context->simultaneous_ssl_restriction =
			info->simultaneous_ssl_restriction;

#ifndef LWS_NO_DAEMONIZE
	if (pid_daemon) {
		context->started_with_parent = pid_daemon;
		lwsl_info(" Started with daemon pid %d\n", pid_daemon);
	}
#endif
#if defined(__ANDROID__)
		n = getrlimit ( RLIMIT_NOFILE,&rt);
		if (-1 == n) {
			lwsl_err("Get RLIMIT_NOFILE failed!\n");
			return NULL;
		}
		context->max_fds = rt.rlim_cur;
#else
		context->max_fds = getdtablesize();
#endif

	if (info->count_threads)
		context->count_threads = info->count_threads;
	else
		context->count_threads = 1;

	if (context->count_threads > LWS_MAX_SMP)
		context->count_threads = LWS_MAX_SMP;

	context->token_limits = info->token_limits;

	context->options = info->options;

	/*
	 * set the context event loops ops struct
	 *
	 * after this, all event_loop actions use the generic ops
	 */

#if defined(LWS_WITH_POLL)
	context->event_loop_ops = &event_loop_ops_poll;
#endif

	if (lws_check_opt(context->options, LWS_SERVER_OPTION_LIBUV))
#if defined(LWS_WITH_LIBUV)
		context->event_loop_ops = &event_loop_ops_uv;
#else
		goto fail_event_libs;
#endif

	if (lws_check_opt(context->options, LWS_SERVER_OPTION_LIBEV))
#if defined(LWS_WITH_LIBEV)
		context->event_loop_ops = &event_loop_ops_ev;
#else
		goto fail_event_libs;
#endif

	if (lws_check_opt(context->options, LWS_SERVER_OPTION_LIBEVENT))
#if defined(LWS_WITH_LIBEVENT)
		context->event_loop_ops = &event_loop_ops_event;
#else
		goto fail_event_libs;
#endif

	if (!context->event_loop_ops)
		goto fail_event_libs;

	lwsl_info("Using event loop: %s\n", context->event_loop_ops->name);

#if defined(LWS_WITH_TLS)
	time(&context->tls.last_cert_check_s);
	if (info->alpn)
		context->tls.alpn_default = info->alpn;
	else {
		char *p = context->tls.alpn_discovered, first = 1;

		LWS_FOR_EVERY_AVAILABLE_ROLE_START(ar) {
			if (ar->alpn) {
				if (!first)
					*p++ = ',';
				p += lws_snprintf(p,
					context->tls.alpn_discovered +
					sizeof(context->tls.alpn_discovered) -
					2 - p, "%s", ar->alpn);
				first = 0;
			}
		} LWS_FOR_EVERY_AVAILABLE_ROLE_END;

		context->tls.alpn_default = context->tls.alpn_discovered;
	}

	lwsl_info("Default ALPN advertisment: %s\n", context->tls.alpn_default);
#endif

	if (info->timeout_secs)
		context->timeout_secs = info->timeout_secs;
	else
		context->timeout_secs = AWAITING_TIMEOUT;

	context->ws_ping_pong_interval = info->ws_ping_pong_interval;

	lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);

	if (info->max_http_header_data)
		context->max_http_header_data = info->max_http_header_data;
	else
		if (info->max_http_header_data2)
			context->max_http_header_data =
					info->max_http_header_data2;
		else
			context->max_http_header_data = LWS_DEF_HEADER_LEN;

	if (info->max_http_header_pool)
		context->max_http_header_pool = info->max_http_header_pool;
	else
		if (info->max_http_header_pool2)
			context->max_http_header_pool =
					info->max_http_header_pool2;
		else
			context->max_http_header_pool = context->max_fds;

	if (info->fd_limit_per_thread)
		context->fd_limit_per_thread = info->fd_limit_per_thread;
	else
		context->fd_limit_per_thread = context->max_fds /
					       context->count_threads;

	/*
	 * Allocate the per-thread storage for scratchpad buffers,
	 * and header data pool
	 */
	for (n = 0; n < context->count_threads; n++) {
		context->pt[n].serv_buf = lws_malloc(context->pt_serv_buf_size,
						     "pt_serv_buf");
		if (!context->pt[n].serv_buf) {
			lwsl_err("OOM\n");
			return NULL;
		}

		context->pt[n].context = context;
		context->pt[n].tid = n;

#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
		context->pt[n].http.ah_list = NULL;
		context->pt[n].http.ah_pool_length = 0;
#endif
		lws_pt_mutex_init(&context->pt[n]);
	}

	lwsl_info(" Threads: %d each %d fds\n", context->count_threads,
		    context->fd_limit_per_thread);

	if (!info->ka_interval && info->ka_time > 0) {
		lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
		return NULL;
	}


#if defined(LWS_WITH_PEER_LIMITS)
	/* scale the peer hash table according to the max fds for the process,
	 * so that the max list depth averages 16.  Eg, 1024 fd -> 64,
	 * 102400 fd -> 6400
	 */
	context->pl_hash_elements =
		(context->count_threads * context->fd_limit_per_thread) / 16;
	context->pl_hash_table = lws_zalloc(sizeof(struct lws_peer *) *
			context->pl_hash_elements, "peer limits hash table");
	context->ip_limit_ah = info->ip_limit_ah;
	context->ip_limit_wsi = info->ip_limit_wsi;
#endif

	lwsl_info(" mem: context:         %5lu B (%ld ctx + (%ld thr x %d))\n",
		  (long)sizeof(struct lws_context) +
		  (context->count_threads * context->pt_serv_buf_size),
		  (long)sizeof(struct lws_context),
		  (long)context->count_threads,
		  context->pt_serv_buf_size);
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
	lwsl_info(" mem: http hdr rsvd:   %5lu B (%u thr x (%u + %lu) x %u))\n",
		    (long)(context->max_http_header_data +
		     sizeof(struct allocated_headers)) *
		    context->max_http_header_pool * context->count_threads,
		    context->count_threads,
		    context->max_http_header_data,
		    (long)sizeof(struct allocated_headers),
		    context->max_http_header_pool);
#endif
	n = sizeof(struct lws_pollfd) * context->count_threads *
	    context->fd_limit_per_thread;
	context->pt[0].fds = lws_zalloc(n, "fds table");
	if (context->pt[0].fds == NULL) {
		lwsl_err("OOM allocating %d fds\n", context->max_fds);
		goto bail;
	}
	lwsl_info(" mem: pollfd map:      %5u\n", n);

	if (info->server_string) {
		context->server_string = info->server_string;
		context->server_string_len = (short)
				strlen(context->server_string);
	}

#if LWS_MAX_SMP > 1
	/* each thread serves his own chunk of fds */
	for (n = 1; n < (int)info->count_threads; n++)
		context->pt[n].fds = context->pt[n - 1].fds +
				     context->fd_limit_per_thread;
#endif

	if (lws_plat_init(context, info))
		goto bail;

	if (context->event_loop_ops->init_context)
		if (context->event_loop_ops->init_context(context, info))
			goto bail;


	if (context->event_loop_ops->init_pt)
		for (n = 0; n < context->count_threads; n++) {
			void *lp = NULL;

			if (info->foreign_loops)
				lp = info->foreign_loops[n];

			if (context->event_loop_ops->init_pt(context, lp, n))
				goto bail;
		}

	if (lws_create_event_pipes(context))
		goto bail;

	lws_context_init_ssl_library(info);

	context->user_space = info->user;

	/*
	 * if he's not saying he'll make his own vhosts later then act
	 * compatibly and make a default vhost using the data in the info
	 */
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
		if (!lws_create_vhost(context, info)) {
			lwsl_err("Failed to create default vhost\n");
			for (n = 0; n < context->count_threads; n++)
				lws_free_set_NULL(context->pt[n].serv_buf);
#if defined(LWS_WITH_PEER_LIMITS)
			lws_free_set_NULL(context->pl_hash_table);
#endif
			lws_free_set_NULL(context->pt[0].fds);
			lws_plat_context_late_destroy(context);
			lws_free_set_NULL(context);
			return NULL;
		}

	lws_context_init_extensions(info, context);

	lwsl_info(" mem: per-conn:        %5lu bytes + protocol rx buf\n",
		    (unsigned long)sizeof(struct lws));

	strcpy(context->canonical_hostname, "unknown");
	lws_server_get_canonical_hostname(context, info);

	context->uid = info->uid;
	context->gid = info->gid;

#if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
	memcpy(context->caps, info->caps, sizeof(context->caps));
	context->count_caps = info->count_caps;
#endif

	/*
	 * drop any root privs for this process
	 * to listen on port < 1023 we would have needed root, but now we are
	 * listening, we don't want the power for anything else
	 */
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
		lws_plat_drop_app_privileges(info);

	/* expedite post-context init (eg, protocols) */
	lws_cancel_service(context);

#if defined(LWS_WITH_SELFTESTS)
	lws_jws_selftest();
#endif

	return context;

bail:
	lws_context_destroy(context);

	return NULL;

fail_event_libs:
	lwsl_err("Requested event library support not configured, available:\n");
	{
		const struct lws_event_loop_ops **elops = available_event_libs;

		while (*elops) {
			lwsl_err("  - %s\n", (*elops)->name);
			elops++;
		}
	}
	lws_free(context);

	return NULL;
}

LWS_VISIBLE LWS_EXTERN void
lws_context_deprecate(struct lws_context *context, lws_reload_func cb)
{
	struct lws_vhost *vh = context->vhost_list, *vh1;
	struct lws *wsi;

	/*
	 * "deprecation" means disable the context from accepting any new
	 * connections and free up listen sockets to be used by a replacement
	 * context.
	 *
	 * Otherwise the deprecated context remains operational, until its
	 * number of connected sockets falls to zero, when it is deleted.
	 */

	/* for each vhost, close his listen socket */

	while (vh) {
		wsi = vh->lserv_wsi;
		if (wsi) {
			wsi->socket_is_permanently_unusable = 1;
			lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "ctx deprecate");
			wsi->context->deprecation_pending_listen_close_count++;
			/*
			 * other vhosts can share the listen port, they
			 * point to the same wsi.  So zap those too.
			 */
			vh1 = context->vhost_list;
			while (vh1) {
				if (vh1->lserv_wsi == wsi)
					vh1->lserv_wsi = NULL;
				vh1 = vh1->vhost_next;
			}
		}
		vh = vh->vhost_next;
	}

	context->deprecated = 1;
	context->deprecation_cb = cb;
}

LWS_VISIBLE LWS_EXTERN int
lws_context_is_deprecated(struct lws_context *context)
{
	return context->deprecated;
}

void
lws_vhost_destroy1(struct lws_vhost *vh)
{
	struct lws_context *context = vh->context;

	lwsl_info("%s\n", __func__);

	lws_context_lock(context, "vhost destroy 1"); /* ---------- context { */

	if (vh->being_destroyed)
		goto out;

	lws_vhost_lock(vh); /* -------------- vh { */

	vh->being_destroyed = 1;

	/*
	 * PHASE 1: take down or reassign any listen wsi
	 *
	 * Are there other vhosts that are piggybacking on our listen socket?
	 * If so we need to hand the listen socket off to one of the others
	 * so it will remain open.
	 *
	 * If not, leave it attached to the closing vhost, the vh being marked
	 * being_destroyed will defeat any service and it will get closed in
	 * later phases.
	 */

	if (vh->lserv_wsi)
		lws_start_foreach_ll(struct lws_vhost *, v,
				     context->vhost_list) {
			if (v != vh &&
			    !v->being_destroyed &&
			    v->listen_port == vh->listen_port &&
			    ((!v->iface && !vh->iface) ||
			    (v->iface && vh->iface &&
			    !strcmp(v->iface, vh->iface)))) {
				/*
				 * this can only be a listen wsi, which is
				 * restricted... it has no protocol or other
				 * bindings or states.  So we can simply
				 * swap it to a vhost that has the same
				 * iface + port, but is not closing.
				 */
				assert(v->lserv_wsi == NULL);
				v->lserv_wsi = vh->lserv_wsi;

				if (v->lserv_wsi) {
					lws_vhost_unbind_wsi(vh->lserv_wsi);
					lws_vhost_bind_wsi(v, v->lserv_wsi);
				}

				lwsl_notice("%s: listen skt from %s to %s\n",
					    __func__, vh->name, v->name);
				break;
			}
		} lws_end_foreach_ll(v, vhost_next);

	lws_vhost_unlock(vh); /* } vh -------------- */

	/*
	 * lws_check_deferred_free() will notice there is a vhost that is
	 * marked for destruction during the next 1s, for all tsi.
	 *
	 * It will start closing all wsi on this vhost.  When the last wsi
	 * is closed, it will trigger lws_vhost_destroy2()
	 */

out:
	lws_context_unlock(context); /* --------------------------- context { */
}

void
__lws_vhost_destroy2(struct lws_vhost *vh)
{
	const struct lws_protocols *protocol = NULL;
	struct lws_context *context = vh->context;
	struct lws_deferred_free *df;
	struct lws wsi;
	int n;

	/*
	 * destroy any pending timed events
	 */

	while (vh->timed_vh_protocol_list)
		lws_timed_callback_remove(vh, vh->timed_vh_protocol_list);

	/*
	 * let the protocols destroy the per-vhost protocol objects
	 */

	memset(&wsi, 0, sizeof(wsi));
	wsi.context = vh->context;
	wsi.vhost = vh; /* not a real bound wsi */
	protocol = vh->protocols;
	if (protocol && vh->created_vhost_protocols) {
		n = 0;
		while (n < vh->count_protocols) {
			wsi.protocol = protocol;
			protocol->callback(&wsi, LWS_CALLBACK_PROTOCOL_DESTROY,
					   NULL, NULL, 0);
			protocol++;
			n++;
		}
	}

	/*
	 * remove vhost from context list of vhosts
	 */

	lws_start_foreach_llp(struct lws_vhost **, pv, context->vhost_list) {
		if (*pv == vh) {
			*pv = vh->vhost_next;
			break;
		}
	} lws_end_foreach_llp(pv, vhost_next);

	/* add ourselves to the pending destruction list */

	vh->vhost_next = vh->context->vhost_pending_destruction_list;
	vh->context->vhost_pending_destruction_list = vh;

	lwsl_info("%s: %p\n", __func__, vh);

	/* if we are still on deferred free list, remove ourselves */

	lws_start_foreach_llp(struct lws_deferred_free **, pdf,
			      context->deferred_free_list) {
		if ((*pdf)->payload == vh) {
			df = *pdf;
			*pdf = df->next;
			lws_free(df);
			break;
		}
	} lws_end_foreach_llp(pdf, next);

	/* remove ourselves from the pending destruction list */

	lws_start_foreach_llp(struct lws_vhost **, pv,
			      context->vhost_pending_destruction_list) {
		if ((*pv) == vh) {
			*pv = (*pv)->vhost_next;
			break;
		}
	} lws_end_foreach_llp(pv, vhost_next);

	/*
	 * Free all the allocations associated with the vhost
	 */

	protocol = vh->protocols;
	if (protocol) {
		n = 0;
		while (n < vh->count_protocols) {
			if (vh->protocol_vh_privs &&
			    vh->protocol_vh_privs[n]) {
				lws_free(vh->protocol_vh_privs[n]);
				vh->protocol_vh_privs[n] = NULL;
			}
			protocol++;
			n++;
		}
	}
	if (vh->protocol_vh_privs)
		lws_free(vh->protocol_vh_privs);
	lws_ssl_SSL_CTX_destroy(vh);
	lws_free(vh->same_vh_protocol_list);

	if (context->plugin_list ||
	    (context->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
		lws_free((void *)vh->protocols);

	LWS_FOR_EVERY_AVAILABLE_ROLE_START(ar)
		if (ar->destroy_vhost)
			ar->destroy_vhost(vh);
	LWS_FOR_EVERY_AVAILABLE_ROLE_END;

#ifdef LWS_WITH_ACCESS_LOG
	if (vh->log_fd != (int)LWS_INVALID_FILE)
		close(vh->log_fd);
#endif

#if defined (LWS_WITH_TLS)
	lws_free_set_NULL(vh->tls.alloc_cert_path);
#endif

#if LWS_MAX_SMP > 1
       pthread_mutex_destroy(&vh->lock);
#endif

#if defined(LWS_WITH_UNIX_SOCK)
	if (LWS_UNIX_SOCK_ENABLED(context)) {
		n = unlink(vh->iface);
		if (n)
			lwsl_info("Closing unix socket %s: errno %d\n",
				  vh->iface, errno);
	}
#endif
	/*
	 * although async event callbacks may still come for wsi handles with
	 * pending close in the case of asycn event library like libuv,
	 * they do not refer to the vhost.  So it's safe to free.
	 */

	if (vh->finalize)
		vh->finalize(vh, vh->finalize_arg);

	lwsl_info("  %s: Freeing vhost %p\n", __func__, vh);

	memset(vh, 0, sizeof(*vh));
	lws_free(vh);
}

/*
 * each service thread calls this once a second or so
 */

int
lws_check_deferred_free(struct lws_context *context, int tsi, int force)
{
	struct lws_context_per_thread *pt;
	int n;

	/*
	 * If we see a vhost is being destroyed, forcibly close every wsi on
	 * this tsi associated with this vhost.  That will include the listen
	 * socket if it is still associated with the closing vhost.
	 *
	 * For SMP, we do this once per tsi per destroyed vhost.  The reference
	 * counting on the vhost as the bound wsi close will notice that there
	 * are no bound wsi left, that vhost destruction can complete,
	 * and perform it.  It doesn't matter which service thread does that
	 * because there is nothing left using the vhost to conflict.
	 */

	lws_context_lock(context, "check deferred free"); /* ------ context { */

	lws_start_foreach_ll_safe(struct lws_vhost *, v, context->vhost_list, vhost_next) {
		if (v->being_destroyed
#if LWS_MAX_SMP > 1
			&& !v->close_flow_vs_tsi[tsi]
#endif
		) {

			pt = &context->pt[tsi];

			lws_pt_lock(pt, "vhost removal"); /* -------------- pt { */

#if LWS_MAX_SMP > 1
			v->close_flow_vs_tsi[tsi] = 1;
#endif

			for (n = 0; (unsigned int)n < pt->fds_count; n++) {
				struct lws *wsi = wsi_from_fd(context, pt->fds[n].fd);
				if (!wsi)
					continue;
				if (wsi->vhost != v)
					continue;

				__lws_close_free_wsi(wsi,
					LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY,
					"vh destroy"
					/* no protocol close */);
				n--;
			}

			lws_pt_unlock(pt); /* } pt -------------- */
		}
	} lws_end_foreach_ll_safe(v);


	lws_context_unlock(context); /* } context ------------------- */

	return 0;
}

LWS_VISIBLE void
lws_vhost_destroy(struct lws_vhost *vh)
{
	struct lws_deferred_free *df = lws_malloc(sizeof(*df), "deferred free");
	struct lws_context *context = vh->context;

	if (!df)
		return;

	lws_context_lock(context, __func__); /* ------ context { */

	lws_vhost_destroy1(vh);

	if (!vh->count_bound_wsi) {
		/*
		 * After listen handoff, there are already no wsi bound to this
		 * vhost by any pt: nothing can be servicing any wsi belonging
		 * to it any more.
		 *
		 * Finalize the vh destruction immediately
		 */
		__lws_vhost_destroy2(vh);
		lws_free(df);

		goto out;
	}

	/* part 2 is deferred to allow all the handle closes to complete */

	df->next = vh->context->deferred_free_list;
	df->deadline = lws_now_secs();
	df->payload = vh;
	vh->context->deferred_free_list = df;

out:
	lws_context_unlock(context); /* } context ------------------- */
}

/*
 * When using an event loop, the context destruction is in three separate
 * parts.  This is to cover both internal and foreign event loops cleanly.
 *
 *  - lws_context_destroy() simply starts a soft close of all wsi and
 *     related allocations.  The event loop continues.
 *
 *     As the closes complete in the event loop, reference counting is used
 *     to determine when everything is closed.  It then calls
 *     lws_context_destroy2().
 *
 *  - lws_context_destroy2() cleans up the rest of the higher-level logical
 *     lws pieces like vhosts.  If the loop was foreign, it then proceeds to
 *     lws_context_destroy3().  If it the loop is internal, it stops the
 *     internal loops and waits for lws_context_destroy() to be called again
 *     outside the event loop (since we cannot destroy the loop from
 *     within the loop).  That will cause lws_context_destroy3() to run
 *     directly.
 *
 *  - lws_context_destroy3() destroys any internal event loops and then
 *     destroys the context itself, setting what was info.pcontext to NULL.
 */

/*
 * destroy the actual context itself
 */

static void
lws_context_destroy3(struct lws_context *context)
{
	struct lws_context **pcontext_finalize = context->pcontext_finalize;
	struct lws_context_per_thread *pt;
	int n;

	for (n = 0; n < context->count_threads; n++) {
		pt = &context->pt[n];

		if (context->event_loop_ops->destroy_pt)
			context->event_loop_ops->destroy_pt(context, n);

		lws_free_set_NULL(context->pt[n].serv_buf);

#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
		while (pt->http.ah_list)
			_lws_destroy_ah(pt, pt->http.ah_list);
#endif
	}

	lws_free(context);
	lwsl_info("%s: ctx %p freed\n", __func__, context);

	if (pcontext_finalize)
		*pcontext_finalize = NULL;
}

/*
 * really start destroying things
 */

void
lws_context_destroy2(struct lws_context *context)
{
	struct lws_vhost *vh = NULL, *vh1;