97 lines
2.9 KiB
Groff
97 lines
2.9 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.TH curl_multi_wakeup 3 "17 Nov 2019" "libcurl" "libcurl"
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.SH NAME
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curl_multi_wakeup - wakes up a sleeping curl_multi_poll call
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLMcode curl_multi_wakeup(CURLM *multi_handle);
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.fi
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.SH DESCRIPTION
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This function can be called from any thread and it wakes up a sleeping
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\fIcurl_multi_poll(3)\fP 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 \fIcurl_multi_poll(3)\fP 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) \fIcurl_multi_poll(3)\fP 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 \fIcurl_multi_wait(3)\fP calls.
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.SH EXAMPLE
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.nf
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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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.fi
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.SH AVAILABILITY
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Added in 7.68.0
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.SH RETURN VALUE
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CURLMcode type, general libcurl multi interface error code.
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.SH "SEE ALSO"
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.BR curl_multi_poll (3),
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.BR curl_multi_wait (3)
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