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docs/examples: use curl_multi_poll() in multi examples

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The API is soon two years old and deserves being shown as the primary
way to drive multi code as it makes it much easier to write code.

multi-poll: removed

multi-legacy: add to show how we did multi API use before
curl_multi_wait/poll.

Closes #7352
This commit is contained in:
Daniel Stenberg 2021-07-06 10:51:46 +02:00
parent 738fb63e61
commit ae8e11ed5f
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15 changed files with 282 additions and 966 deletions
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33
docs/examples/multi-single.c
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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -50,9 +50,7 @@ int main(void)
{
CURL *http_handle;
CURLM *multi_handle;
int still_running = 0; /* keep number of running handles */
int repeats = 0;
int still_running = 1; /* keep number of running handles */
curl_global_init(CURL_GLOBAL_DEFAULT);
@ -67,37 +65,18 @@ int main(void)
/* add the individual transfers */
curl_multi_add_handle(multi_handle, http_handle);
/* we start some action by calling perform right away */
curl_multi_perform(multi_handle, &still_running);
while(still_running) {
CURLMcode mc; /* curl_multi_wait() return code */
int numfds;
do {
CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
/* wait for activity, timeout or "nothing" */
mc = curl_multi_wait(multi_handle, NULL, 0, 1000, &numfds);
mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
if(mc != CURLM_OK) {
fprintf(stderr, "curl_multi_wait() failed, code %d.\n", mc);
break;
}
/* 'numfds' being zero means either a timeout or no file descriptors to
wait for. Try timeout on first occurrence, then assume no file
descriptors and no file descriptors to wait for means wait for 100
milliseconds. */
if(!numfds) {
repeats++; /* count number of repeated zero numfds */
if(repeats > 1) {
WAITMS(100); /* sleep 100 milliseconds */
}
}
else
repeats = 0;
curl_multi_perform(multi_handle, &still_running);
}
} while(still_running);
curl_multi_remove_handle(multi_handle, http_handle);