[commit: ghc] master: PackageDb: Explicitly unlock package database before closing (779b9e6)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/779b9e6965416ee08af6eb15354cf09e9f40e0d9/ghc

>---------------------------------------------------------------

commit 779b9e6965416ee08af6eb15354cf09e9f40e0d9
Author: Ben Gamari <bgamari.foss at gmail.com>
Date:   Tue Aug 29 14:45:28 2017 -0400

    PackageDb: Explicitly unlock package database before closing
    
    Reviewers: austin
    
    Subscribers: rwbarton, thomie
    
    GHC Trac Issues: #13945
    
    Differential Revision: https://phabricator.haskell.org/D3874


>---------------------------------------------------------------

779b9e6965416ee08af6eb15354cf09e9f40e0d9
 libraries/ghc-boot/GHC/PackageDb.hs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libraries/ghc-boot/GHC/PackageDb.hs b/libraries/ghc-boot/GHC/PackageDb.hs
index 9ce07e7..a59c46e 100644
--- a/libraries/ghc-boot/GHC/PackageDb.hs
+++ b/libraries/ghc-boot/GHC/PackageDb.hs
@@ -267,7 +267,11 @@ lockPackageDbWith mode file = do
                    return $ PackageDbLock hnd
 
 lockPackageDb = lockPackageDbWith ExclusiveLock
-unlockPackageDb (PackageDbLock hnd) = hClose hnd
+unlockPackageDb (PackageDbLock hnd) = do
+#if MIN_VERSION_base(4,11,0)
+    hUnlock hnd
+#endif
+    hClose hnd
 
 -- MIN_VERSION_base(4,10,0)
 #else