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| author |  Joey Hess <joeyh@joeyh.name> | 2015-12-16 13:24:45 -0400 |
|---|---|---|
| committer | Joey Hess <joeyh@joeyh.name> | 2015-12-16 13:24:45 -0400 |
| commit | 9760673f5e76757714f4b7bd185ef41a3d649e7f (patch) | |
| tree | 700e466e59c02f2dd5d1d341b2559240fc8c96e9 /Database/Keys.hs | |
| parent | 747caa452a29a38bb8f02a0efaf47fb80a92bf6d (diff) | |
comment
Diffstat (limited to 'Database/Keys.hs')
| -rw-r--r-- | Database/Keys.hs | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Database/Keys.hs b/Database/Keys.hs index 62c7c25eb..d4b5b3357 100644 --- a/Database/Keys.hs +++ b/Database/Keys.hs @@ -54,7 +54,14 @@ Content KeyCacheIndex key cache |] -{- Opens the database, creating it if it doesn't exist yet. -} +{- Opens the database, creating it if it doesn't exist yet. + - + - Multiple readers and writers can have the database open at the same + - time. Database.Handle deals with the concurrency issues. + - The lock is held while opening the database, so that when + - the database doesn't exist yet, one caller wins the lock and + - can create it undisturbed. + -} openDb :: Annex DbHandle openDb = withExclusiveLock gitAnnexKeysDbLock $ do dbdir <- fromRepo gitAnnexKeysDb |