Fix #800

sslgte279 and ssl3: Move the check for _sslobj to inside the loop
instead of above it. That way if the socket is closed while
reading/writing (actually, while waiting for the read or write event)
then the ValueError will be raised on the next loop iteration (because
closing cancels the read/write events) instead of a TypeError.

This may or may not obviate the chances for an OSError: closed to be
raised.

changelog.rst

@@ -99,6 +99,10 @@ Other Changes
   present in Python 2), :func:`gevent.ssl.get_server_certificate`
   would raise a :exc:`ValueError` if the system wasn't monkey-patched.
   Reported in :issue:`801` by Gleb Dubovik.
+- On Python 2.7.9 and Python 3, closing an SSL socket in one greenlet
+  while it's being read from or written to in a different greenlet is
+  less likely to raise a :exc:`TypeError` instead of a
+  :exc:`ValueError`. Reported in :issue:`800` by Kevin Chen.
 
 1.1.1 (Apr 4, 2016)
 ===================

src/gevent/_ssl3.py

@@ -221,10 +221,11 @@ class SSLSocket(socket):
         Return zero-length string on EOF."""
         # pylint:disable=too-many-branches
         self._checkClosed()
-        if not self._sslobj:
-            raise ValueError("Read on closed or unwrapped SSL socket.")
 
         while True:
+            if not self._sslobj:
+                raise ValueError("Read on closed or unwrapped SSL socket.")
+
             try:
                 if buffer is not None:
                     return self._sslobj.read(len, buffer)
@@ -252,10 +253,11 @@ class SSLSocket(socket):
         """Write DATA to the underlying SSL channel.  Returns
         number of bytes of DATA actually transmitted."""
         self._checkClosed()
-        if not self._sslobj:
-            raise ValueError("Write on closed or unwrapped SSL socket.")
 
         while True:
+            if not self._sslobj:
+                raise ValueError("Write on closed or unwrapped SSL socket.")
+
             try:
                 return self._sslobj.write(data)
             except SSLError as ex:

src/gevent/_sslgte279.py

@@ -300,9 +300,11 @@ class SSLSocket(socket):
         """Read up to LEN bytes and return them.
         Return zero-length string on EOF."""
         self._checkClosed()
-        if not self._sslobj:
-            raise ValueError("Read on closed or unwrapped SSL socket.")
-        while True:
+
+        while 1:
+            if not self._sslobj:
+                raise ValueError("Read on closed or unwrapped SSL socket.")
+
             try:
                 if buffer is not None:
                     return self._sslobj.read(len, buffer)
@@ -330,9 +332,11 @@ class SSLSocket(socket):
         """Write DATA to the underlying SSL channel.  Returns
         number of bytes of DATA actually transmitted."""
         self._checkClosed()
-        if not self._sslobj:
-            raise ValueError("Write on closed or unwrapped SSL socket.")
-        while True:
+
+        while 1:
+            if not self._sslobj:
+                raise ValueError("Write on closed or unwrapped SSL socket.")
+
             try:
                 return self._sslobj.write(data)
             except SSLError as ex: