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download: if there are active requests, never sleep for 10s

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In some versions/configurations libcurl doesn't handle timeouts
(especially DNS timeouts) in a way that wakes curl_multi_wait.

This doesn't appear to be a problem if using c-ares, FWIW.
This commit is contained in:
Will Dietz 2018-05-24 16:23:05 -05:00
parent 74144ae845
commit 6bf7dc1baf
1 changed files with 2 additions and 1 deletions
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3
src/libstore/download.cc
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@ -503,10 +503,11 @@ struct CurlDownloader : public Downloader
extraFDs[0].fd = wakeupPipe.readSide.get();
extraFDs[0].events = CURL_WAIT_POLLIN;
extraFDs[0].revents = 0;
long maxSleepTimeMs = items.empty() ? 10000 : 100;
auto sleepTimeMs =
nextWakeup != std::chrono::steady_clock::time_point()
? std::max(0, (int) std::chrono::duration_cast<std::chrono::milliseconds>(nextWakeup - std::chrono::steady_clock::now()).count())
: 10000;
: maxSleepTimeMs;
vomit("download thread waiting for %d ms", sleepTimeMs);
mc = curl_multi_wait(curlm, extraFDs, 1, sleepTimeMs, &numfds);
if (mc != CURLM_OK)