share interface overview
libcurl-share - how to use the share interface
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.
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).
You create a shared object with curl_share_init. 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.
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 too.
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 are done using the share, make sure that no easy handle is still using it, and call curl_share_cleanup on the handle.
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