use abstract sockets on linux (#455)

tensorpack/dataflow/parallel.py

 # -*- coding: UTF-8 -*-
 # File: parallel.py
 
-
+import sys
 import weakref
 from contextlib import contextmanager
 import multiprocessing as mp
@@ -42,6 +42,13 @@ def _bind_guard(sock, name):
 
 
 def _get_pipe_name(name):
+    if sys.platform.startswith('linux'):
+        # linux supports abstract sockets: http://api.zeromq.org/4-1:zmq-ipc
+        pipename = "ipc://@{}-pipe-{}".format(name, str(uuid.uuid1())[:8])
+        pipedir = os.environ.get('TENSORPACK_PIPEDIR', None)
+        if pipedir is not None:
+            logger.warn("TENSORPACK_PIPEDIR is not used on Linux any more! Abstract sockets will be used.")
+    else:
         pipedir = os.environ.get('TENSORPACK_PIPEDIR', None)
         if pipedir is not None:
             logger.info("ZMQ uses TENSORPACK_PIPEDIR={}".format(pipedir))