[Xen-devel] [PATCH] tools/hotplug/Linux: forced to release lock if holder process is gone

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

When a script using locking.sh is stopped by ctrl-C, the lock file remains.
We have to wait 100 seconds for releasing the lock at the next time.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

diff -r 89116f28083f tools/hotplug/Linux/locking.sh
--- a/tools/hotplug/Linux/locking.sh    Wed Dec 08 10:46:31 2010 +0000
+++ b/tools/hotplug/Linux/locking.sh    Mon Dec 13 10:36:25 2010 +0900
@@ -61,6 +61,12 @@ _claim_lock()
     then
       owner="$new_owner"
       retries=0
+    else
+      local pid=$(echo $owner | cut -d : -f 1)
+      if [ ! -f "/proc/$pid/status" ]
+      then
+        _release_lock $lockdir
+      fi
     fi
 
     if [ $retries -gt $LOCK_SPINNING_RETRIES ]

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