Changeset 793 for trunk/packages/sipb-xen-base/files/usr/share/python-support/sipb-xen-base/invirt/common.py

Timestamp:

Jul 30, 2008, 9:50:42 PM (16 years ago)

Author:

y_z

Message:

added shared/exclusive locking; added shared locking of initial JSON cache read

File:

• trunk/packages/sipb-xen-base/files/usr/share/python-support/sipb-xen-base/invirt/common.py (modified) (2 diffs)

trunk/packages/sipb-xen-base/files/usr/share/python-support/sipb-xen-base/invirt/common.py

@@ -40 +40 @@
     return wrapper
 
-def with_lock_file(path):
+def with_lock_file(path, exclusive = True):
     """
     Context manager for lock files.  Example:
@@ -54 +54 @@
         @with_closing(file(path, 'w'))
         def g(f):
-            flock(f, LOCK_EX)
+            if exclusive: locktype = LOCK_EX
+            else:         locktype = LOCK_SH
+            flock(f, locktype)
             try: return func()
             finally: flock(f, LOCK_UN)