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In the threaded index preloading case, we must be sure to always use the CE_MATCH_RACY_IS_DIRTY flag when calling ie_match_stat(), in order to make sure that we only ever look at the stat() data, and don't try to do anything fancy. Because most of git internals are not thread-safe, and must not be called in parallel. Otherwise, what happens is that if the timestamps indicate that an entry _might_ be dirty, we might start actually comparing filesystem data with the object database. And we mustn't do that, because that would involve looking up and creating the object structure, and that whole code sequence with read_sha1_file() where we look up and add objects to the hashes is definitely not thread-safe. Nor do we want to add locking, because the whole point of the preload was to be simple and not affect anything else. With CE_MATCH_RACY_IS_DIRTY, we get what we wanted, and we'll just leave the hard cases well alone, to be done later in the much simpler serial case. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
//////////////////////////////////////////////////////////////// GIT - the stupid content tracker //////////////////////////////////////////////////////////////// "git" can mean anything, depending on your mood. - random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant. - stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang. - "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room. - "goddamn idiotic truckload of sh*t": when it breaks Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals. Git is an Open Source project covered by the GNU General Public License. It was originally written by Linus Torvalds with help of a group of hackers around the net. It is currently maintained by Junio C Hamano. Please read the file INSTALL for installation instructions. See Documentation/tutorial.txt to get started, then see Documentation/everyday.txt for a useful minimum set of commands, and "man git-commandname" for documentation of each command. CVS users may also want to read Documentation/cvs-migration.txt. Many Git online resources are accessible from http://git.or.cz/ including full documentation and Git related tools. The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org. To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org. The mailing list archives are available at http://marc.theaimsgroup.com/?l=git and other archival sites. The messages titled "A note from the maintainer", "What's in git.git (stable)" and "What's cooking in git.git (topics)" and the discussion following them on the mailing list give a good reference for project status, development direction and remaining tasks.