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libcurl-share(3)                           libcurl share interface                          libcurl-share(3)



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  or  DNS cache! This way, each single transfer will take 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).  Currently
       you can only share DNS and/or COOKIE data.

       Since  you  can use this share from multiple threads, and libcurl has no internal thread synchroniza-tion, synchronization,
       tion, 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)



libcurl 7.10.7                                   8 Aug 2003                                 libcurl-share(3)