Greenlet failing on OSX and Windows

```
[2017-10-16 14:50:09,571] ERROR Site:... sands.git/packed-refs fileGet error: [Errno 2] No such file or directory: u'/Users/Manwe/Tools/ZeroNet/data/1RxTdD54fbEdVZs2hZCUBWirJf5bSsAUg/sands.git/packed-refs'
[2017-10-16 14:50:09,686] DEBUG Site:... Websocket send error: ConcurrentObjectUseError: This socket is already used by another greenlet: > in UiWebsocket.py line 197 > websocket.py line 349 > websocket.py line 333 > _socket2.pyo line 419 > _socket2.pyo line 355 > _socket2.pyo line 328 > _socket2.pyo line 176
[2017-10-16 14:50:09,686] DEBUG Site:... Websocket send error: ConcurrentObjectUseError: This socket is already used by another greenlet: > in UiWebsocket.py line 197 > websocket.py line 349 > websocket.py line 333 > _socket2.pyo line 419 > _socket2.pyo line 355 > _socket2.pyo line 328 > _socket2.pyo line 176
[2017-10-16 14:50:09,686] DEBUG Site:... Websocket send error: ConcurrentObjectUseError: This socket is already used by another greenlet: > in UiWebsocket.py line 197 > websocket.py line 349 > websocket.py line 333 > _socket2.pyo line 419 > _socket2.pyo line 355 > _socket2.pyo line 328 > _socket2.pyo line 176
```

...and a lot more messages. My site is trying to read many files at once, can it be related? This fails on OSX and works on Windows.

Commencez par le chemin d’appel journalisé passant par UiWebsocket.py ligne 197 et websocket.py lignes 349 et 333, puis comparez le comportement d’OSX et de Windows concernant les lectures de fichiers concurrentes. Reproduisez le scénario de lecture de nombreux fichiers du site et déterminez quel changement empêcherait le ConcurrentObjectUseError sans perturber les envois websocket.

Rédigé par le modèle d'indexation à partir du texte de l'issue.