Merge pull request #9 from Unity-Technologies/socket-timeout-fix

fix on the socket timeout error

python/unityagents/environment.py

 import os
 import socket
 import subprocess
-import signal
 
 from .brain import BrainInfo, BrainParameters
 from .exception import UnityEnvironmentException, UnityActionException
         except os.error:
             self.close()
             raise UnityEnvironmentException("Couldn't launch new environment. "
-                                            "Provided filename does not match any \environments in {}."
-                                            .format(cwd))
+                "Provided filename does not match any \environments in {}."
+                .format(cwd))
-        def timeout_handler():
-            raise UnityEnvironmentException(
+        self._socket.settimeout(30) 
+        try:
+            try:
+                self._socket.listen(1)
+                self._conn, _ = self._socket.accept()
+                self._conn.setblocking(1)
+                p = self._conn.recv(self._buffer_size).decode('utf-8')
+                p = json.loads(p)
+            except socket.timeout as e:
+                raise UnityEnvironmentException(
-                "and that the Academy and the external Brain(s) scripts are attached to objects in the Scene.".format(
+                "and that the Academy and the external Brain(s) are attached to objects in the Scene.".format(
-
-        old_handler = signal.signal(signal.SIGALRM, timeout_handler)
-        signal.alarm(30)  # trigger alarm in x seconds
-        try:
-            self._socket.listen(1)
-            self._conn, _ = self._socket.accept()
-            p = self._conn.recv(self._buffer_size).decode('utf-8')
-            p = json.loads(p)
-        signal.signal(signal.SIGALRM, old_handler)
-        signal.alarm(0)
+
 
         self._data = {}
         self._global_done = None