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, DNS cache, TLS session cache
and/or connection cache! This way, each single transfer will take ad-
vantage 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 CUR-
LOPT_SHARE(3) option with curl_easy_setopt(3), and pass in share han-
dle. You can make any number of easy handles share the same share han-
dle.
To make an easy handle stop using that particular share, you set CUR-
LOPT_SHARE(3) to NULL for that easy handle. To make a handle stop shar-
ing a particular data, you can CURLSHOPT_UNSHARE 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)
libcurl 7.81.0 October 31, 2021 libcurl-share(3)
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