Implement flock locking.

_2048/lock.py

@@ -1,28 +1,39 @@
-"""An implementation of a file locker."""
+class FileLockBase(object):
-
+    def __init__(self, fd):
-# Import msvcrt if possible.
-try:
-    import msvcrt
-except ImportError:
-    # Currently no linux solution with fcntl.
-    raise RuntimeError('Linux locker not written yet.')
-else:
-    class FileLock(object):
-        def __init__(self, fd, size=65536):
         if hasattr(fd, 'fileno') and callable(fd.fileno):
             self.fd = fd.fileno()
         else:
             self.fd = fd
-            self.size = size
 
     def acquire(self, blocking=True):
-            msvcrt.locking(self.fd, (msvcrt.LK_NBLCK, msvcrt.LK_LOCK)[blocking], self.size)
+        raise NotImplementedError()
 
     def release(self):
-            msvcrt.locking(self.fd, msvcrt.LK_UNLCK, self.size)
+        raise NotImplementedError()
 
     def __enter__(self):
         self.acquire()
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         self.release()
+
+
+try:
+    import msvcrt
+except ImportError:
+    import fcntl
+    import os
+
+    class FileLock(FileLockBase):
+        def acquire(self, blocking=True):
+            fcntl.flock(self.fd, fcntl.LOCK_EX | (0 if blocking else fcntl.LOCK_NB))
+
+        def release(self):
+            fcntl.flock(self.fd, fcntl.LOCK_UN)
+else:
+    class FileLock(FileLockBase):
+        def acquire(self, blocking=True):
+            msvcrt.locking(self.fd, (msvcrt.LK_NBLCK, msvcrt.LK_LOCK)[blocking], -1)
+
+        def release(self):
+            msvcrt.locking(self.fd, msvcrt.LK_UNLCK, -1)

_2048/manager.py

@@ -1,5 +1,3 @@
-"""Defines the Game manager."""
-
 import os
 import errno
 import itertools