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Re: [PATCH 2/7] Switch git_mmap to use pread.

From
Linus Torvalds <torvalds@osdl.org>
Date
Dec 24, 2006, 20:14 UTC
Message-ID
<Pine.LNX.4.64.0612241213320.3671@woody.osdl.org>
In-Reply-To
<Pine.LNX.4.63.0612241407250.19693@wbgn013.biozentrum.uni-wuerzburg.de>
On Sun, 24 Dec 2006, Johannes Schindelin wrote:
> 
> I don't think it matters much. The _only_ platform we really use NO_MMAP 
> (other than for testing) is Windows, and AFAICT it does not have pread(), 
> so it is emulated by lseek/read/lseek anyway.

Windows definitely has pread(). It is, of course, possible that Cygwin emulates it some other way (including doing a "lseek/read/lseek" combination), but pread() should still be better - because maybe some future cygwin release ends up using the native interfaces.

		Linus
Previous: Shawn PearceNext: Shawn O. Pearce
Message 5 of 13 in “Switch git_mmap to use pread.”
  1. 2/7 Switch git_mmap to use pread.Shawn O. Pearce, Dec 24, 2006
  2. Johannes SchindelinDec 24, 2006
  3. Alon ZivDec 24, 2006
  4. Shawn PearceDec 24, 2006
  5. Linus TorvaldsDec 24, 2006
  6. 3/7 Ensure packed_git.next is initialized to NULL.Shawn O. Pearce, Dec 24, 2006
  7. 4/7 Default core.packdGitWindowSize to 1 MiB if NO_MMAP.Shawn O. Pearce, Dec 24, 2006
  8. 5/7 Don't exit successfully on EPIPE in read_or_die.Shawn O. Pearce, Dec 24, 2006
  9. 6/7 Release pack windows before reporting out of memory.Shawn O. Pearce, Dec 24, 2006
  10. Johannes SchindelinDec 24, 2006
  11. 7/7 Replace mmap with xmmap, better handling MAP_FAILED.Shawn O. Pearce, Dec 24, 2006
  12. Johannes SchindelinDec 24, 2006
  13. Shawn PearceDec 24, 2006

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