On 08.11.2017 14:37, Daniel Stenberg wrote:
On Wed, 8 Nov 2017, Wolfgang Steinwender wrote:
Documentation for curl_multi_fdset:
When libcurl returns -1 in max_fd [..]
You then need to wait a while before you proceed and call curl_multi_perform anyway. How long to
wait? We suggest 100 milliseconds at least [..]
But: If i call curl_multi_fdset() directly after curl_multi_add_handle(), max_fd is always -1. If
I wait 100ms in this case, start of the transfer is delayed by 100ms. I don't think that is required.
You're right.
Maybe we should improve how that is explained. When you figure out what file descriptors to wait
for, you should also ask libcurl for the *maximum* time to wait. curl_multi_timeout() tells you that.
In this case, when you have just called curl_multi_add_handle(), curl_multi_timeout() will return
saying you shouldn't wait at all but you should call libcurl immediately as it has things to do. In
this moment in time, the -1 value in max_fd is less of a concern.
curl_multi_timeout() says maximum 0ms, curl_multi_fdset() at least 100ms.
A valid value from curl_multi_timeout() *always* takes precedence over max_fd =
-1 or
only immediatly after curl_multi_add_handle()?
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