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02346abc32
Repeatedly we see problems where using curl_multi_wait() is difficult or just awkward because if it has no file descriptor to wait for internally, it returns immediately and leaves it to the caller to wait for a small amount of time in order to avoid occasional busy-looping. This is often missed or misunderstood, leading to underperforming applications. This change introduces curl_multi_poll() as a replacement drop-in function that accepts the exact same set of arguments. This function works identically to curl_multi_wait() - EXCEPT - for the case when there's nothing to wait for internally, as then this function will by itself wait for a "suitable" short time before it returns. This effectiely avoids all risks of busy-looping and should also make it less likely that apps "over-wait". This also changes the curl tool to use this funtion internally when doing parallel transfers and changes curl_easy_perform() to use it internally. Closes #4163
93 lines
3.7 KiB
C
93 lines
3.7 KiB
C
#ifndef HEADER_CURL_MULTIIF_H
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#define HEADER_CURL_MULTIIF_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) 1998 - 2019, 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.haxx.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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***************************************************************************/
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/*
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* Prototypes for library-wide functions provided by multi.c
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*/
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void Curl_updatesocket(struct Curl_easy *data);
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void Curl_expire(struct Curl_easy *data, timediff_t milli, expire_id);
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void Curl_expire_clear(struct Curl_easy *data);
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void Curl_expire_done(struct Curl_easy *data, expire_id id);
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void Curl_update_timer(struct Curl_multi *multi);
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void Curl_attach_connnection(struct Curl_easy *data,
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struct connectdata *conn);
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bool Curl_multiplex_wanted(const struct Curl_multi *multi);
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void Curl_set_in_callback(struct Curl_easy *data, bool value);
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bool Curl_is_in_callback(struct Curl_easy *easy);
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/* Internal version of curl_multi_init() accepts size parameters for the
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socket and connection hashes */
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struct Curl_multi *Curl_multi_handle(int hashsize, int chashsize);
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/* the write bits start at bit 16 for the *getsock() bitmap */
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#define GETSOCK_WRITEBITSTART 16
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#define GETSOCK_BLANK 0 /* no bits set */
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/* set the bit for the given sock number to make the bitmap for writable */
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#define GETSOCK_WRITESOCK(x) (1 << (GETSOCK_WRITEBITSTART + (x)))
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/* set the bit for the given sock number to make the bitmap for readable */
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#define GETSOCK_READSOCK(x) (1 << (x))
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#ifdef DEBUGBUILD
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/*
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* Curl_multi_dump is not a stable public function, this is only meant to
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* allow easier tracking of the internal handle's state and what sockets
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* they use. Only for research and development DEBUGBUILD enabled builds.
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*/
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void Curl_multi_dump(struct Curl_multi *multi);
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#endif
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/* Return the value of the CURLMOPT_MAX_HOST_CONNECTIONS option */
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size_t Curl_multi_max_host_connections(struct Curl_multi *multi);
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/* Return the value of the CURLMOPT_MAX_TOTAL_CONNECTIONS option */
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size_t Curl_multi_max_total_connections(struct Curl_multi *multi);
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void Curl_multiuse_state(struct connectdata *conn,
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int bundlestate); /* use BUNDLE_* defines */
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/*
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* Curl_multi_closed()
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*
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* Used by the connect code to tell the multi_socket code that one of the
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* sockets we were using is about to be closed. This function will then
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* remove it from the sockethash for this handle to make the multi_socket API
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* behave properly, especially for the case when libcurl will create another
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* socket again and it gets the same file descriptor number.
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*/
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void Curl_multi_closed(struct Curl_easy *data, curl_socket_t s);
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/*
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* Add a handle and move it into PERFORM state at once. For pushed streams.
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*/
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CURLMcode Curl_multi_add_perform(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_MULTIIF_H */
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