Merge pull request #43 from avagin/lock

Acquire a lock to a preference file before working with it

1 files changed, 3 insertions, 0 deletions

diff --git a/configshell/prefs.py b/configshell/prefs.py
index 248cc1d..7faa1fe 100644
--- a/configshell/prefs.py
+++ b/configshell/prefs.py
@@ -16,6 +16,7 @@ under the License.
 '''
 
 import six
+import fcntl
 
 class Prefs(object):
     '''
@@ -128,6 +129,7 @@ class Prefs(object):
 
         if filename is not None:
             fsock = open(filename, 'wb')
+            fcntl.lockf(fsock, fcntl.LOCK_UN)
             try:
                 six.moves.cPickle.dump(self._prefs, fsock, 2)
             finally:
@@ -143,6 +145,7 @@ class Prefs(object):
 
         if filename is not None:
             fsock = open(filename, 'rb')
+            fcntl.lockf(fsock, fcntl.LOCK_SH)
             try:
                 self._prefs = six.moves.cPickle.load(fsock)
             finally: