On Wed, 19 Dec 2018, Samuel Hurst via curl-library wrote:
I was not aware that this was a requirement on multi-threaded applications. The CURLOPT_NOSIGNAL API documentation [1] does not reference this requirement at all, which is why I've missed it.
I should clarify in there!
My application is multi-threaded, but I have a dedicated thread just for running curl in - there should never be another thread which calls curl_multi_perform. Would I need to set CURLOPT_NOSIGNAL even in this case?
If you're only using curl in a single thread then you're fine to use CURLOPT_NOSIGNAL I think. Unless you need SIGPIPE (filtering) for something else.
The issue when using CURLOPT_NOSIGNAL when using curl from multiple threads is that curl needs to ignore the signals but it can't do it globally for the process so it will set the ignore the entry and clear it again on exit. But signals are global per process so if you then invoke curl multiple times within the process, the ignoring/clearing of signals end up in a race.
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