tor/changes/bug8822

  o Major bugfixes (windows):
    - Prevent failures on Windows Vista and later when rebuilding the
      microdescriptor cache. Diagnosed by Robert Ransom. Fixes bug 8822;
      bugfix on 0.2.4.12-alpha.
Unmap the microdescriptor cache before replacing it. This is a reprise of the fix in bdff7e3299d78; 6905c1f6 reintroduced that bug. Briefly: windows doesn't seem to like deleting a mapped file. I tried adding the PROT_SHARED_DELETE flag to the createfile all, but that didn't actually fix this issue. Fortunately, the unit test I added in 4f4fc63fea0589a4fa03f3859dc27860cdde75af should prevent us from making this particular screw-up again. This patch also tries to limit the crash potential of a failure to write by a little bit, although it could do a better job of retaining microdescriptor bodies. Fix for bug 8822, bugfix on 0.2.4.12-alpha. 2013-06-12 18:04:33 +02:00			`o Major bugfixes (windows):`
			`- Prevent failures on Windows Vista and later when rebuilding the`
			`microdescriptor cache. Diagnosed by Robert Ransom. Fixes bug 8822;`
			`bugfix on 0.2.4.12-alpha.`