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! This way, each single transfer will
       take advantage from data updates made by the other  transfer(s).  The  sharing  interface,
       however, does not share active or persistent connections between different easy handles.

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're 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  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 to NULL for
       that   easy   handle.   To  make  a  handle  stop  sharing  a  particular  data,  you  can
       CURLSHOPT_UNSHARE it.

       When you're 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)