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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. |
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README
Curl is a command line tool for transferring data specified with URL
syntax. Find out how to use curl by reading the curl.1 man page or the
MANUAL document. Find out how to install Curl by reading the INSTALL
document.
libcurl is the library curl is using to do its job. It is readily
available to be used by your software. Read the libcurl.3 man page to
learn how!
You find answers to the most frequent questions we get in the FAQ document.
Study the COPYING file for distribution terms and similar. If you distribute
curl binaries or other binaries that involve libcurl, you might enjoy the
LICENSE-MIXING document.
CONTACT
If you have problems, questions, ideas or suggestions, please contact us
by posting to a suitable mailing list. See http://curl.haxx.se/mail/
All contributors to the project are listed in the THANKS document.
WEB SITE
Visit the curl web site for the latest news and downloads:
http://curl.haxx.se/
GIT
To download the very latest source off the GIT server do this:
git clone git://github.com/bagder/curl.git
(you'll get a directory named curl created, filled with the source code)
NOTICE
Curl contains pieces of source code that is Copyright (c) 1998, 1999
Kungliga Tekniska Högskolan. This notice is included here to comply with the
distribution terms.