NAME

       libcurl-share - how to use the share interface

DESCRIPTION

       This  is  an  overview on how to use the libcurl share interface in your C programs. There
       are specific man pages for each function mentioned in here.

       All functions in the share interface are prefixed with curl_share.

OBJECTIVES

       The share interface was added to enable sharing of data between curl "handles".

ONE SET OF DATA - MANY TRANSFERS

       You can have multiple easy handles share data between them. Have them update and  use  the
       same cookie database, DNS cache, TLS session cache and/or connection cache! This way, each
       single transfer takes advantage from data updates made by the other transfer(s).

SHARE OBJECT

       You create a shared object with curl_share_init(3).  It  returns  a  handle  for  a  newly
       created one.

       You tell the shared object what data you want it to share by using curl_share_setopt(3).

       Since  you  can  use  this share from multiple threads, and libcurl has no internal thread
       synchronization, you must provide mutex callbacks if you are  using  this  multi-threaded.
       You set lock and unlock functions with curl_share_setopt(3) too.

       Then,  you make an easy handle to use this share, you set the CURLOPT_SHARE(3) option with
       curl_easy_setopt(3), and pass in share handle. You can make any  number  of  easy  handles
       share the same share handle.

       To  make an easy handle stop using that particular share, you set CURLOPT_SHARE(3) to NULL
       for that easy  handle.  To  make  a  handle  stop  sharing  a  particular  data,  you  can
       CURLSHOPT_UNSHARE(3) it.

       When  you  are  done using the share, make sure that no easy handle is still using it, and
       call curl_share_cleanup(3) on the handle.

SEE ALSO

       curl_share_init(3),   curl_share_setopt(3),   curl_share_cleanup(3),    libcurl-errors(3),
       libcurl-easy(3), libcurl-multi(3)