Extra compatibility closing handles.

appveyor.yml

@@ -22,6 +22,11 @@ environment:
     #   PYTHON_VERSION: "2.7.x" # currently 2.7.9
     #   PYTHON_ARCH: "32"
 
+    - PYTHON: "C:\\Python34-x64"
+      PYTHON_VERSION: "3.4.x" # currently 3.4.3
+      PYTHON_ARCH: "64"
+
+
     - PYTHON: "C:\\Python27-x64"
       PYTHON_VERSION: "2.7.x" # currently 2.7.9
       PYTHON_ARCH: "64"
@@ -38,9 +43,6 @@ environment:
     #   PYTHON_VERSION: "3.4.x" # currently 3.4.3
     #   PYTHON_ARCH: "32"
 
-    - PYTHON: "C:\\Python34-x64"
-      PYTHON_VERSION: "3.4.x" # currently 3.4.3
-      PYTHON_ARCH: "64"
 
     # Also test a Python version not pre-installed
     # See: https://github.com/ogrisel/python-appveyor-demo/issues/10

gevent/subprocess.py

@@ -814,12 +814,16 @@ class Popen(object):
                 # output pipe are maintained in this process or else the
                 # pipe will not close when the child process exits and the
                 # ReadFile will hang.
-                if p2cread is not None:
-                    p2cread.Close()
-                if c2pwrite is not None:
-                    c2pwrite.Close()
-                if errwrite is not None:
-                    errwrite.Close()
+                def _close(x):
+                    if x is not None and x != -1:
+                        if hasattr(x, 'Close'):
+                            x.Close()
+                        else:
+                            _winapi.CloseHandle(x)
+
+                _close(p2cread)
+                _close(c2pwrite)
+                _close(errwrite)
                 if hasattr(self, '_devnull'):
                     os.close(self._devnull)