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curl: avoid uncessary libcurl timeouts (in parallel mode)

When curl_multi_wait() returns OK without file descriptors to wait for,
it might already have done a long timeout.

Closes #4159
This commit is contained in:
Daniel Stenberg 2019-07-29 08:50:25 +02:00
parent 802aa5ae27
commit a2ab576768
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@ -1972,11 +1972,14 @@ static CURLcode parallel_transfers(struct GlobalConfig *global,
while(!done && !mcode && still_running) {
int numfds;
struct timeval before = tvnow();
long delta;
mcode = curl_multi_wait(multi, NULL, 0, 1000, &numfds);
delta = tvdiff(tvnow(), before);
if(!mcode) {
if(!numfds) {
if(!numfds && (delta < 30)) {
long sleep_ms;
/* If it returns without any file descriptor instantly, we need to