curl_multi_wakeup(3)            libcurl Manual            curl_multi_wakeup(3)

NAME
       curl_multi_wakeup - wakes up a sleeping curl_multi_poll call

SYNOPSIS
       #include <curl/curl.h>

       CURLMcode curl_multi_wakeup(CURLM *multi_handle);

DESCRIPTION
       This function can be called from any thread and it wakes up a sleeping
       _multi_poll&section=3">curl_multi_poll(3) call that is currently (or will be) waiting for
       activity or a timeout.

       If the function is called when there is no _multi_poll&section=3">curl_multi_poll(3) call, it
       will cause the next call to return immediately.

       Calling this function only guarantees to wake up the current (or the
       next if there is no current) _multi_poll&section=3">curl_multi_poll(3) call, which means it is
       possible that multiple calls to this function will wake up the same
       waiting operation.

       This function has no effect on _multi_wait&section=3">curl_multi_wait(3) calls.

RETURN VALUE
       CURLMcode type, general libcurl multi interface error code.

AVAILABILITY
       Added in 7.68.0

EXAMPLE
       CURL *easy_handle;
       CURLM *multi_handle;

       /* add the individual easy handle */
       curl_multi_add_handle(multi_handle, easy_handle);

       /* this is thread 1 */
       do {
         CURLMcode mc;
         int numfds;

         mc = curl_multi_perform(multi_handle, &still_running);

         if(mc == CURLM_OK) {
           /* wait for activity, timeout or wakeup */
           mc = curl_multi_poll(multi_handle, NULL, 0, 10000, &numfds);
         }

         if(time_to_die())
           exit(1);

       } while(still_running);

       curl_multi_remove_handle(multi_handle, easy_handle);

       /* this is thread 2 */

       if(something makes us decide to stop thread 1) {

         set_something_to_signal_thread_1_to_exit();

         curl_multi_wakeup(multi_handle);
       }

SEE ALSO
       curl_multi_poll(3), curl_multi_wait(3)

libcurl 7.77.0                 November 5, 2020           curl_multi_wakeup(3)