curl_multi_wakeup - wakes up a sleeping curl_multi_poll call
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 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 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 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 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)
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