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
curl_multi_poll(3) call that is currently (or will be) waiting for ac-
tivity 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)
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