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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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108
docs/examples/imap-multi.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
@ -32,35 +32,13 @@
/* This is a simple example showing how to fetch mail using libcurl's IMAP
* capabilities. It builds on the imap-fetch.c example to demonstrate how to
* use libcurl's multi interface.
*
* Note that this example requires libcurl 7.30.0 or above.
*/
#define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
static struct timeval tvnow(void)
{
struct timeval now;
/* time() returns the value of time in seconds since the epoch */
now.tv_sec = (long)time(NULL);
now.tv_usec = 0;
return now;
}
static long tvdiff(struct timeval newer, struct timeval older)
{
return (newer.tv_sec - older.tv_sec) * 1000 +
(newer.tv_usec - older.tv_usec) / 1000;
}
int main(void)
{
CURL *curl;
CURLM *mcurl;
int still_running = 1;
struct timeval mp_start;
curl_global_init(CURL_GLOBAL_DEFAULT);
@ -82,86 +60,16 @@ int main(void)
/* Tell the multi stack about our easy handle */
curl_multi_add_handle(mcurl, curl);
/* Record the start time which we can use later */
mp_start = tvnow();
do {
CURLMcode mc = curl_multi_perform(mcurl, &still_running);
/* We start some action by calling perform right away */
curl_multi_perform(mcurl, &still_running);
if(still_running)
/* wait for activity, timeout or "nothing" */
mc = curl_multi_poll(mcurl, NULL, 0, 1000, NULL);
while(still_running) {
struct timeval timeout;
fd_set fdread;
fd_set fdwrite;
fd_set fdexcep;
int maxfd = -1;
int rc;
CURLMcode mc; /* curl_multi_fdset() return code */
long curl_timeo = -1;
/* Initialise the file descriptors */
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
FD_ZERO(&fdexcep);
/* Set a suitable timeout to play around with */
timeout.tv_sec = 1;
timeout.tv_usec = 0;
curl_multi_timeout(mcurl, &curl_timeo);
if(curl_timeo >= 0) {
timeout.tv_sec = curl_timeo / 1000;
if(timeout.tv_sec > 1)
timeout.tv_sec = 1;
else
timeout.tv_usec = (curl_timeo % 1000) * 1000;
}
/* get file descriptors from the transfers */
mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd);
if(mc != CURLM_OK) {
fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
if(mc)
break;
}
/* On success the value of maxfd is guaranteed to be >= -1. We call
select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
to sleep 100ms, which is the minimum suggested value in the
curl_multi_fdset() doc. */
if(maxfd == -1) {
#ifdef _WIN32
Sleep(100);
rc = 0;
#else
/* Portable sleep for platforms other than Windows. */
struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
rc = select(0, NULL, NULL, NULL, &wait);
#endif
}
else {
/* Note that on some platforms 'timeout' may be modified by select().
If you need access to the original value save a copy beforehand. */
rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
}
if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
fprintf(stderr,
"ABORTING: Since it seems that we would have run forever.\n");
break;
}
switch(rc) {
case -1: /* select error */
break;
case 0: /* timeout */
default: /* action */
curl_multi_perform(mcurl, &still_running);
break;
}
}
} while(still_running);
/* Always cleanup */
curl_multi_remove_handle(mcurl, curl);