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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: curl_multi_wakeup
Section: 3
Source: libcurl
See-also:
- curl_multi_poll (3)
- curl_multi_wait (3)
---
# NAME
curl_multi_wakeup - wakes up a sleeping curl_multi_poll call
# SYNOPSIS
~~~c
#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 is about to be) waiting
for activity or a timeout.
If the function is called when there is no curl_multi_poll(3) call, it
causes 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 wake up the same waiting operation.
This function has no effect on curl_multi_wait(3) calls.
# EXAMPLE
~~~c
extern int time_to_die(void);
extern int set_something_to_signal_thread_1_to_exit(void);
extern int decide_to_stop_thread1();
int main(void)
{
CURL *easy;
CURLM *multi;
int still_running;
/* add the individual easy handle */
curl_multi_add_handle(multi, easy);
/* this is thread 1 */
do {
CURLMcode mc;
int numfds;
mc = curl_multi_perform(multi, &still_running);
if(mc == CURLM_OK) {
/* wait for activity, timeout or wakeup */
mc = curl_multi_poll(multi, NULL, 0, 10000, &numfds);
}
if(time_to_die())
return 1;
} while(still_running);
curl_multi_remove_handle(multi, easy);
/* this is thread 2 */
if(decide_to_stop_thread1()) {
set_something_to_signal_thread_1_to_exit();
curl_multi_wakeup(multi);
}
}
~~~
# AVAILABILITY
Added in 7.68.0
# RETURN VALUE
CURLMcode type, general libcurl multi interface error code.
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