Commits

Lenard Lindstrom committed aaa35b9

trackmod: remove an unused module

  • Participants
  • Parent commits 7a77ae9
  • Branches trackmod

Comments (0)

Files changed (1)

trackmod/keylock.py

-# module lazyimp.keylock
-
-"""Per-key reentrant thread locks"""
-
-import threading
-
-class Lock(object):
-    """A per-key reentrant thread lock
-
-    KeyLock(Key) => acquired lock
-
-    KeyLock provides locking by key. If others threads hold a non-freed Lock
-    instance for the given key then the constructor blocks until the other
-    threads have freed their instances.
-
-    """
-
-    cache = {}
-    cache_lock = threading.Lock()
-
-    class Error(Exception):
-        pass
-
-    def __new__(cls, key):
-        """Return a new acquired Lock instance"""
-        cls.cache_lock.acquire()
-        try:
-            try:
-                lock, count = cls.cache[key]
-            except KeyError:
-                lock = threading.RLock()
-                count = 0
-            cls.cache[key] = lock, count + 1
-        finally:
-            cls.cache_lock.release()
-        obj = object.__new__(cls)
-        obj.key = key
-        lock.acquire()
-        return obj
-
-    def free(self):
-        """Release the lock"""
-        self.cache_lock.acquire()
-        try:
-            try:
-                key = self.key
-            except AttributeError:
-                raise self.Error("Lock already freed")
-            lock, count = self.cache.pop(key)
-            lock.release()
-            if count > 1:
-                self.cache[key] = lock, count - 1
-            del self.key
-        finally:
-            self.cache_lock.release()
-
-    def __del__(self):
-        """Release the lock
-        
-        Yes, this method is here but should not be relied upon.
-        Call free explicitly.
-
-        """
-        try:
-            self.free()
-        except self.Error:
-            pass