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tutorial: remove CURLM_CALL_MULTI_PERFORM add sharing

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The CURLM_CALL_MULTI_PERFORM reference is an old leftover I had to
remove.

I also added some blurb to the previously blank "sharing" section.
This commit is contained in:
Daniel Stenberg 2011-12-20 09:48:32 +01:00
parent 7cc2e8b349
commit 7799ac434e
1 changed files with 14 additions and 4 deletions
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18
docs/libcurl/libcurl-tutorial.3
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@ -1303,9 +1303,7 @@ ones at any time), you start the transfers by calling
\fIcurl_multi_perform(3)\fP is asynchronous. It will only execute as little as
possible and then return back control to your program. It is designed to never
block. If it returns CURLM_CALL_MULTI_PERFORM you better call it again soon,
as that is a signal that it still has local data to send or remote data to
receive.
block.
The best usage of this interface is when you do a select() on all possible
file descriptors or sockets to know when to call libcurl again. This also
@ -1341,9 +1339,21 @@ to figure out success on each individual transfer.
[ seeding, passwords, keys, certificates, ENGINE, ca certs ]
.SH "Sharing Data Between Easy Handles"
You can share some data between easy handles when the easy interface is used,
and some data is share automatically when you use the multi interface.
[ fill in ]
When you add easy handles to a multi handle, these easy handles will
automatically share a lot of the data that otherwise would be kept on a
per-easy handle basis when the easy interface is used.
The DNS cache is shared between handles within a multi handle, making
subsequent name resolvings faster and the connection pool that is kept to
better allow persistent connections and connection re-use is shared. If you're
using the easy interface, you can still share these between specific easy
handles by using the share interface, see \fIlibcurl-share(3)\fP.
Some things are never shared automatically, not within multi handles, like for
example cookies so the only way to share that is with the share interface.
.SH "Footnotes"
.IP "[1]"