add locked() method to lock object

Lock.locked() returns a boolean indicating if the lock is acquired and valid.
Thanks Alan Justino da Silva

Fixes #1007

1 files changed, 4 insertions, 0 deletions

diff --git a/redis/lock.py b/redis/lock.py
index 05d4153..43c0813 100644
--- a/redis/lock.py
+++ b/redis/lock.py
@@ -172,6 +172,10 @@ class Lock(object):
             return True
         return False
 
+    def locked(self):
+        token = self.local.token
+        return token and self.redis.get(self.name) == token or False
+
     def release(self):
         "Releases the already acquired lock"
         expected_token = self.local.token