CURLOPT_NOSIGNAL might be a MUST to make threaded use work, like on AIX 5.2

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 http://www.gnu.org/software/gnutls/manual/html_node/Multi_002dthreaded-applications.html

 http://www.gnu.org/software/gnutls/manual/html_node/Multi_002dthreaded-applications.html

When using multiple threads you should set the CURLOPT_NOSIGNAL option to

When using multiple threads you should set the CURLOPT_NOSIGNAL option to TRUE

TRUE for all handles. Everything will work fine except that timeouts are not

for all handles. Everything will or might work fine except that timeouts are

honored during the DNS lookup - which you can work around by building libcurl

not honored during the DNS lookup - which you can work around by building

with c-ares support. c-ares is a library that provides asynchronous name

libcurl with c-ares support. c-ares is a library that provides asynchronous

resolves. Unfortunately, c-ares does not yet support IPv6.

name resolves. Unfortunately, c-ares does not yet fully support IPv6. On some

platforms, libcurl simply will not function properly multi-threaded unless

this option is set.

Also, note that CURLOPT_DNS_USE_GLOBAL_CACHE is not thread-safe.

Also, note that CURLOPT_DNS_USE_GLOBAL_CACHE is not thread-safe.