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https://github.com/warmcat/libwebsockets.git
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d702b83d10
Until now the uv watcher has been composed in the wsi. This works fine except in the case of a client wsi that meets a redirect when the event loop is libuv with its requirement for handle close via the event loop. We want to reuse the wsi, since the originator of it has a copy of the wsi pointer, and we want to conceal the redirect. Since the redirect is commonly to a different IP, we want to keep the wsi alive while closing its socket cleanly. That's not too difficult, unless you are using uv. With UV the comoposed watcher is a disaster, since after the close is requested the wsi will start to reconnect. We tried to deal with that by copying the uv handle and freeing it when the handle close finalizes. But it turns out the handle is in a linked-list scheme in uv. This patch hopefully finally solves it by giving the uv handle its own allocation from the start. When we want to close the socket and reuse the wsi, we simply take responsibility for freeing the handle and set the wsi watcher pointer to NULL.
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2018 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* This is included from core/private.h if LWS_WITH_LIBUV
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*/
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#include <uv.h>
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/*
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* libuv's async destroy cb means that asking to close something doesn't mean
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* you can destroy it or parent things until after the close completes.
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*
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* So we must reference-count creation and close completions with libuv.
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*
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* All "static" (per-pt or per-context) uv handles must
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*
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* - have their .data set to point to the context
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*
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* - contribute to context->uv_count_static_asset_handles
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* counting
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*/
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#define LWS_UV_REFCOUNT_STATIC_HANDLE_NEW(_x, _ctx) \
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{ uv_handle_t *_uht = (uv_handle_t *)(_x); _uht->data = _ctx; \
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_ctx->count_event_loop_static_asset_handles++; }
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#define LWS_UV_REFCOUNT_STATIC_HANDLE_TO_CONTEXT(_x) \
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((struct lws_context *)((uv_handle_t *)((_x)->data)))
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#define LWS_UV_REFCOUNT_STATIC_HANDLE_DESTROYED(_x) \
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(--(LWS_UV_REFCOUNT_STATIC_HANDLE_TO_CONTEXT(_x)-> \
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count_event_loop_static_asset_handles))
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struct lws_pt_eventlibs_libuv {
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uv_loop_t *io_loop;
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uv_signal_t signals[8];
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uv_timer_t timeout_watcher;
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uv_timer_t hrtimer;
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uv_idle_t idle;
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};
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struct lws_context_eventlibs_libuv {
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uv_loop_t loop;
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};
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struct lws_io_watcher_libuv {
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uv_poll_t *pwatcher;
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};
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struct lws_signal_watcher_libuv {
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uv_signal_t watcher;
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};
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extern struct lws_event_loop_ops event_loop_ops_uv;
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LWS_VISIBLE uv_loop_t *
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lws_uv_getloop(struct lws_context *context, int tsi);
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