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curl_easy_perform: gradually increase the delay time 

Instead of going 50,100,150 etc millisecond delay time when nothing has
been found to do or wait for, we now start lower and double each loop as
in 4,8,16,32 etc.

This lowers the minimum wait without sacrifizing the longer wait too
much with unnecessary CPU cycles burnt.

Bug: http://curl.haxx.se/mail/lib-2013-07/0103.html
Reported-by: Andreas Malzahn
This commit is contained in:
Daniel Stenberg 2013-07-14 17:33:24 +02:00
parent e2e92486a7
commit d529f3882b
1 changed files with 1 additions and 3 deletions
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4
lib/easy.c
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@ -539,9 +539,7 @@ CURLcode curl_easy_perform(CURL *easy)
if(curlx_tvdiff(after, before) <= 10) {
without_fds++;
if(without_fds > 2) {
int sleep_ms = without_fds * 50;
if(sleep_ms > 1000)
sleep_ms = 1000;
int sleep_ms = without_fds < 10 ? (1 << (without_fds-1)): 1000;
Curl_wait_ms(sleep_ms);
}
}