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);

              The data argument tells what kind of data libcurl wants to lock. Make sure that the
              callback uses a different lock 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)