title: why do i have error "Address already in use"?
body: <p>i run my flask app, and it works good, but by the time the app is stopped  and in my uwsgi log    </p>
  
  <pre><code>probably another instance of uWSGI is running on the same address (127.0.0.1:9002).
      bind(): Address already in use [core/socket.c line 764]
  </code></pre>
  
  <p>when i run touch touch_reload, app is working again. 
  I run anything else on the server which may take the socket. </p>
  
  <p>my conf:</p>
  
  <pre><code>nginx
  server {
      listen 80;
      ....
      location / {
         include uwsgi_params;
         uwsgi_pass 127.0.0.1:9001;
      }
      ....
  }
  server {
      listen 80;
      ....
      location / {
         include uwsgi_params;
         uwsgi_pass 127.0.0.1:9003;
      }
      ....
  }
  
  uwsgi:
  chdir = /var/www/../
  module = wsgihandler
  socket = 127.0.0.1:9003
  wsgi-file = app/__init__.py
  callable = app
  master = true
  chmod-socket = 664
  uid = root
  gid = root
  processes = 4
  socket-timeout = 180
  post-buffering = 8192
  max-requests = 1000
  buffer-size = 32768
  logto = /var/www/.../log/uwsgi.log
  touch-reload = /var/www/.../touch_reload
  </code></pre>