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 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 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)
       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 curl_multi_wait(3) calls.

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);
       }

AVAILABILITY

       Added in 7.68.0

RETURN VALUE

       CURLMcode type, general libcurl multi interface error code.

SEE ALSO

       curl_multi_poll(3), curl_multi_wait(3)

libcurl 7.81.0                                  November 26, 2021                           curl_multi_wakeup(3)