**************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
**************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
**************************************************************************
curl_share_setopt 3 "May 28, 2018" "libcurl 7.64.1" "libcurl Manual"
NAME
curl_share_setopt - Set options for a shared object
SYNOPSIS
#include <curl/curl.h> CURLSHcode curl_share_setopt(CURLSH *share, CURLSHoption option, parameter);
DESCRIPTION
Set the option to parameter for the given share.
OPTIONS
CURLSHOPT_LOCKFUNC
The parameter must be a pointer to a function matching the following
prototype:
void lock_function(CURL *handle, curl_lock_data data, curl_lock_access access,
void *userptr);
data defines what data libcurl wants to lock, and you must make sure that
only one lock is given at any time for each kind of data.
access defines what access type libcurl wants, shared or single.
userptr is the pointer you set with CURLSHOPT_USERDATA.
CURLSHOPT_UNLOCKFUNC
The parameter must be a pointer to a function matching the following
prototype:
void unlock_function(CURL *handle, curl_lock_data data, void *userptr);
data defines what data libcurl wants to unlock, and you must make sure
that only one lock is given at any time for each kind of data.
userptr is the pointer you set with CURLSHOPT_USERDATA.
CURLSHOPT_SHARE
The parameter specifies a type of data that should be shared. This may
be set to one of the values described below.
CURL_LOCK_DATA_COOKIE
Cookie data will be shared across the easy handles using this shared object.
CURL_LOCK_DATA_DNS
Cached DNS hosts will be shared across the easy handles using this shared
object. Note that when you use the multi interface, all easy handles added to
the same multi handle will share DNS cache by default without using this
option.
CURL_LOCK_DATA_SSL_SESSION
SSL session IDs will be shared across the easy handles using this shared
object. This will reduce the time spent in the SSL handshake when reconnecting
to the same server. Note SSL session IDs are reused within the same easy handle
by default. Note this symbol was added in 7.10.3 but was not implemented until
7.23.0.
CURL_LOCK_DATA_CONNECT
Put the connection cache in the share object and make all easy handles using
this share object share the connection cache. Using this, you can for example
do multi-threaded libcurl use with one handle in each thread, and yet have a
shared pool of unused connections and this way get way better connection
re-use than if you use one separate pool in each thread.
Connections that are used for HTTP/1.1 Pipelining or HTTP/2 multiplexing only
get additional transfers added to them if the existing connection is held by
the same multi or easy handle. libcurl does not support doing HTTP/2 streams
in different threads using a shared connection.
Support for CURL_LOCK_DATA_CONNECT was added in 7.57.0, but the symbol
existed before this.
Note that when you use the multi interface, all easy handles added to the same
multi handle will share connection cache by default without using this option.
CURL_LOCK_DATA_PSL
The Public Suffix List stored in the share object is made available to all
easy handle bound to the later. Since the Public Suffix List is periodically
refreshed, this avoids updates in too many different contexts.
CURL_LOCK_DATA_PSL exists since 7.61.0.
Note that when you use the multi interface, all easy handles added to the same
multi handle will share PSL cache by default without using this option.
CURLSHOPT_UNSHARE
This option does the opposite of CURLSHOPT_SHARE. It specifies that
the specified parameter will no longer be shared. Valid values are
the same as those for CURLSHOPT_SHARE.
CURLSHOPT_USERDATA
The parameter allows you to specify a pointer to data that will be passed
to the lock_function and unlock_function each time it is called.
RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred as <curl/curl.h> defines. See the libcurl-errors.3
man page for the full list with descriptions.
"SEE ALSO"
curl_share_cleanup "(3), " curl_share_init "(3)"