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@@ -6,6 +6,26 @@ Changelog +Daniel Stenberg (1 June 2010) +- Igor Novoseltsev reported a problem with the multi socket API and using + timeouts and timers. It boiled down to a problem with libcurl's use of + GetTickCount() interally to figure out the current time, while Igor's own + application code used another function call. + + It made his app call the socket API timeout function a bit _before_ libcurl + would consider the timeout to trigger, and that could easily lead to + timeouts or stalls in the app. It seems GetTickCount() in general often has + no better resolution than 16ms and switching to the alternative function + QueryPerformanceCounter has its share of problems: + http://www.virtualdub.org/blog/pivot/entry.php?id=106 + + We address this problem by simply having libcurl treat timers that already + has occured or will occur within 40ms subject for treatment. I'm confident + that there are other implementations and operating systems with similarly in + accurate timer functions so it makes sense to have applied generically and I + don't believe we sacrifice much by adding a 40ms inaccuracy on these + timeouts. + Kamil Dudka (27 May 2010) - added a new test for CRL support (test313) |