[Xen-changelog] [xen-unstable] tools/hotplug/Linux: forced to release lock if holder process is gone

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Kouya Shimura <kouya@xxxxxxxxxxxxxx>
# Date 1292346948 0
# Node ID 57907b28e51abc1cd62979a9915d560e427cbacf
# Parent  f46d49257da5b0d6c7042c9539d40372c0ddf1a3
tools/hotplug/Linux: forced to release lock if holder process is gone

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>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/hotplug/Linux/locking.sh |    6 ++++++
 1 files changed, 6 insertions(+)

diff -r f46d49257da5 -r 57907b28e51a tools/hotplug/Linux/locking.sh
--- a/tools/hotplug/Linux/locking.sh    Tue Dec 14 16:56:54 2010 +0000
+++ b/tools/hotplug/Linux/locking.sh    Tue Dec 14 17:15:48 2010 +0000
@@ -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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