Manpages - curl_multi_wakeup.3

curl_multi_wakeup - wakes up a sleeping curl_multi_poll call

#include <curl/curl.h>

CURLMcode curl_multi_wakeup(CURLM *multi_handle);

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.

  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);
  }

Added in 7.68.0

CURLMcode type, general libcurl multi interface error code.

*curl_multi_poll*(3), *curl_multi_wait*(3)