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 CURLMOPT_MAX_TOTAL_CONNECTIONS. When the limit is reached, the sessions will be pending until there are available connections. If CURLMOPT_PIPELINING is enabled, libcurl will try to pipeline or use multiplexing if the host is capable of it.
CURLM *m = curl_multi_init(); /* never do more than 15 connections */ curl_multi_setopt(m, CURLMOPT_MAX_TOTAL_CONNECTIONS, 15L);
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