Hi ,all:
I am using curl multi socket and libevent,such as the example hiperfifo, we know that Multi socket often offers a much more high-performance for applications using large numbers of simultaneous connections. So I use large amount connections in client , I register the callback of CURLMOPT_TIMERFUNCTION like this:
 curl_multi_setopt(m_MultiHandle, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
 curl_multi_setopt(m_MultiHandle, CURLMOPT_TIMERDATA, &g);
static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
{
  struct timeval timeout;
  (void)multi; /* unused */
  
  timeout.tv_sec = timeout_ms/1000;
  timeout.tv_usec = (timeout_ms%1000)*1000;
  fprintf(stdout, "multi_timer_cb: Setting timeout to %ld ms\n", timeout_ms);
  evtimer_add(g->timer_event, &timeout);
  return 0;
}
in this callback function ,we just print the timeout time, and I am so confused about the log .
 [2015-01-13 23:39:56.209615] DBG|CImgMultiDownload.cpp|374|timer_cb|before curl_multi_socket_action
  42 [2015-01-13 23:39:56.212750] DBG|CImgMultiDownload.cpp|443|sock_cb|socket callback: s=115 e=0x1af6c90 what=OUT
  43 [2015-01-13 23:39:56.212764] DBG|CImgMultiDownload.cpp|456|sock_cb|Adding data: OUT
  44 [2015-01-13 23:39:56.212780] DBG|CImgMultiDownload.cpp|392|multi_timer_cb|multi_timer_cb: Setting timeout to 997 ms <- first called
  45 [2015-01-13 23:39:56.212795] DBG|CImgMultiDownload.cpp|376|timer_cb|after curl_multi_socket_action
  46 [2015-01-13 23:39:56.212807] DBG|CImgMultiDownload.cpp|226|check_multi_info|REMAINING: 1
  47 [2015-01-13 23:39:56.213652] DBG|CImgMultiDownload.cpp|392|multi_timer_cb|multi_timer_cb: Setting timeout to 997 ms <- second called
  48 [2015-01-13 23:39:56.213665] DBG|CImgMultiDownload.cpp|226|check_multi_info|REMAINING: 1
  49 [2015-01-13 23:39:57.211260] DBG|CImgMultiDownload.cpp|374|timer_cb|before curl_multi_socket_action
  50 [2015-01-13 23:39:57.211287] DBG|CImgMultiDownload.cpp|443|sock_cb|socket callback: s=115 e=0x1af6c90 what=REMOVE <- here remove the socket,why? I thought here shou be sent http header to server
  51 [2015-01-13 23:39:57.211300] DBG|CImgMultiDownload.cpp|447|sock_cb|remove socket fd!
  52 [2015-01-13 23:39:57.211311] DBG|CImgMultiDownload.cpp|376|timer_cb|after curl_multi_socket_action

why the callback function of multi_timer_cb called twice??
and my second question is :In what condition ,the callback function multi_timer_cb will be called ?
Thanks a lot!

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Received on 2015-01-13