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, 8 insertions, 0 deletions

diff --git a/tests/test_lock.py b/tests/test_lock.py
index a9ecf54..a6adbc2 100644
--- a/tests/test_lock.py
+++ b/tests/test_lock.py
@@ -18,6 +18,14 @@ class TestLock(object):
         lock.release()
         assert r.get('foo') is None
 
+    def test_locked(self, r):
+        lock = self.get_lock(r, 'foo')
+        assert lock.locked() is False
+        lock.acquire(blocking=False)
+        assert lock.locked() is True
+        lock.release()
+        assert lock.locked() is False
+
     def test_competing_locks(self, r):
         lock1 = self.get_lock(r, 'foo')
         lock2 = self.get_lock(r, 'foo')