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909af1a43b
Change multi's book keeping of transfers to no longer use lists, but a special table and bitsets for unsigned int values. `multi-xfers` is the `uint_tbl` where `multi_add_handle()` inserts a new transfer which assigns it a unique identifier `mid`. Use bitsets to keep track of transfers that are in state "process" or "pending" or "msgsent". Use sparse bitsets to replace `conn->easyq` and event handlings tracking of transfers per socket. Instead of pointers, keep the mids involved. Provide base data structures and document them in docs/internal: * `uint_tbl`: a table of transfers with `mid` as lookup key, handing out a mid for adds between 0 - capacity. * `uint_bset`: a bitset keeping unsigned ints from 0 - capacity. * `uint_spbset`: a sparse bitset for keeping a small number of unsigned int values * `uint_hash`: for associating `mid`s with a pointer. This makes the `mid` the recommended way to refer to transfers inside the same multi without risk of running into a UAF. Modifying table and bitsets is safe while iterating over them. Overall memory requirements are lower as with the double linked list apprach. Closes #16761
84 lines
3.3 KiB
C
84 lines
3.3 KiB
C
#ifndef HEADER_CURL_MULTI_EV_H
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#define HEADER_CURL_MULTI_EV_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "hash.h"
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#include "hash_offt.h"
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struct Curl_easy;
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struct Curl_multi;
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struct easy_pollset;
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struct uint_bset;
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struct curl_multi_ev {
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struct Curl_hash sh_entries;
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struct uint_hash xfer_pollsets;
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struct Curl_hash_offt conn_pollsets;
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};
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/* Setup/teardown of multi event book-keeping. */
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void Curl_multi_ev_init(struct Curl_multi *multi, size_t hashsize);
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void Curl_multi_ev_cleanup(struct Curl_multi *multi);
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/* Assign a 'user_data' to be passed to the socket callback when
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* invoked with the given socket. This will fail if this socket
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* is not active, e.g. the application has not been told to monitor it. */
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CURLMcode Curl_multi_ev_assign(struct Curl_multi *multi, curl_socket_t s,
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void *user_data);
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/* Assess the transfer by getting its current pollset, compute
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* any changes to the last one and inform the application's socket
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* callback if things have changed. */
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CURLMcode Curl_multi_ev_assess_xfer(struct Curl_multi *multi,
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struct Curl_easy *data);
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/* Assess all easy handles on the list */
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CURLMcode Curl_multi_ev_assess_xfer_bset(struct Curl_multi *multi,
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struct uint_bset *set);
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/* Assess the connection by getting its current pollset */
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CURLMcode Curl_multi_ev_assess_conn(struct Curl_multi *multi,
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struct Curl_easy *data,
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struct connectdata *conn);
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/* Expire all transfers tied to the given socket */
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void Curl_multi_ev_expire_xfers(struct Curl_multi *multi,
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curl_socket_t s,
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const struct curltime *nowp,
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bool *run_cpool);
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/* Socket will be closed, forget anything we know about it. */
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void Curl_multi_ev_socket_done(struct Curl_multi *multi,
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struct Curl_easy *data, curl_socket_t s);
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/* Transfer is removed from the multi */
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void Curl_multi_ev_xfer_done(struct Curl_multi *multi,
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struct Curl_easy *data);
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/* Connection is being destroyed */
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void Curl_multi_ev_conn_done(struct Curl_multi *multi,
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struct Curl_easy *data,
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struct connectdata *conn);
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#endif /* HEADER_CURL_MULTI_EV_H */
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