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 inter-
       face 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 advan-
       tage 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 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 han-
       dles 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)