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