pywsgi: react to any error in accept() by sleeping a bit

gevent/pywsgi.py

@@ -386,19 +386,19 @@ def server(sock, site, log=None, environ=None, max_size=None, max_http_version=D
                 port = ''
 
         print "(%s) wsgi starting up on %s://%s%s/" % (os.getpid(), scheme, host, port)
+        delay = 0.1
         while True:
             try:
                 client_socket = sock.accept()
+                delay = 0.1
                 pool.spawn(serv.process_request, client_socket)
             except socket.error, e:
                 if e[0] == errno.EMFILE:
-                    # we ran out of file descriptors and will call accept in a busy loop...
-                    # ...which we avoid by sleeping a bit
-                    print "WARNING: pywsgi: out of file descriptors. cannot accept outstanding connections."
-                    sleep(1.0)
-                    continue
-                if e[0] != errno.EPIPE and e[0] != errno.EBADF:
-                    raise
+                    print "WARNING: pywsgi: out of file descriptors; will not accept for %s seconds" % delay
+                else:
+                    print 'WARNING: pywsgi: accept failed with error %s: %s; will not accept for %s seconds' % (e[0], e, delay)
+                sleep(delay)
+                delay *= 2
     finally:
         try:
             sock.close()