[mod] move hook to set Unix thread name into searx.unixthreadname

requires setproctitle (but optional)

searx/unixthreadname.py

@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+"""
+if setproctitle is installed.
+set Unix thread name with the Python thread name
+"""
+
+try:
+    import setproctitle
+except ImportError:
+    pass
+else:
+    import threading
+    old_thread_init = threading.Thread.__init__
+
+    def new_thread_init(self, *args, **kwargs):
+        # pylint: disable=protected-access, disable=c-extension-no-member, disable=missing-function-docstring
+        old_thread_init(self, *args, **kwargs)
+        setproctitle.setthreadtitle(self._name)
+    threading.Thread.__init__ = new_thread_init