CURLMOPT_MAX_TOTAL_CONNECTIONS - max simultaneously open connections
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_TOTAL_CONNECTIONS,
long amount);
Pass a long for the
amount. The set number will be used as the maximum
number of simultaneously open connections in total using this multi handle.
For each new session, libcurl will open a new connection up to the limit set
by . When the limit is reached, the
sessions will be pending until there are available connections. If
CURLMOPT_PIPELINING(3) is enabled, libcurl will try to use multiplexing
if the host is capable of it.
When more transfers are added to the multi handle than what can be performed due
to the set limit, they will be queued up waiting for their chance. When that
happens, the
CURLOPT_TIMEOUT_MS(3) timeout will be counted inclusive of
the waiting time, meaning that if you set a too narrow timeout in such a case
the transfer might never even start before it times out.
Even in the queued up situation, the
CURLOPT_CONNECTTIMEOUT_MS(3) timeout
is however treated as a per-connect timeout.
The default value is 0, which means that there is no limit. It is then simply
controlled by the number of easy handles added.
All
CURLM *m = curl_multi_init();
/* never do more than 15 connections */
curl_multi_setopt(m, CURLMOPT_MAX_TOTAL_CONNECTIONS, 15L);
Added in 7.30.0
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
CURLMOPT_MAXCONNECTS(3),
CURLMOPT_MAX_HOST_CONNECTIONS(3),