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note about the need for extra functions set to OpenSSL if you use OpenSSL

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multi-threaded
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Daniel Stenberg 2004-01-29 16:17:25 +00:00
parent ab52e20832
commit 7052598e59
1 changed files with 8 additions and 1 deletions
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docs/libcurl-the-guide
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@ -222,7 +222,14 @@ Multi-threading issues
handlers. Signals are needed for a SIGPIPE handler, and the alarm() syscall
is used to catch timeouts (mostly during DNS lookup).
So when using multiple threads you should first ignore SIGPIPE in your main
If you are accessing HTTPS or FTPS URLs in a multi-threaded manner, you are
then of course using OpenSSL multi-threaded and it has itself a few
requirements on this. Basicly, you need to provide one or two functions to
allow it to function properly. For all details, see this:
http://www.openssl.org/docs/crypto/threads.html#DESCRIPTION
When using multiple threads you should first ignore SIGPIPE in your main
thread and set the CURLOPT_NOSIGNAL option to TRUE for all handles.
Everything will work fine except that timeouts are not honored during the DNS