--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/galaxy/util/monitors.py	Thu May 14 14:56:58 2020 -0400
@@ -0,0 +1,53 @@
+from __future__ import absolute_import
+
+import logging
+import threading
+
+from .sleeper import Sleeper
+from .web_compat import register_postfork_function
+
+log = logging.getLogger(__name__)
+
+DEFAULT_MONITOR_THREAD_JOIN_TIMEOUT = 5
+
+
+class Monitors(object):
+
+    def _init_monitor_thread(self, name, target_name=None, target=None, start=False, config=None):
+        self.monitor_join_sleep = getattr(config, "monitor_thread_join_timeout", DEFAULT_MONITOR_THREAD_JOIN_TIMEOUT)
+        self.monitor_join = self.monitor_join_sleep > 0
+        self.monitor_running = True
+
+        if target is not None:
+            assert target_name is None
+            monitor_func = target
+        else:
+            target_name = target_name or "monitor"
+            monitor_func = getattr(self, target_name)
+        self.sleeper = Sleeper()
+        self.monitor_thread = threading.Thread(name=name, target=monitor_func)
+        self.monitor_thread.setDaemon(True)
+        self._start = start
+        register_postfork_function(self.start_monitoring)
+
+    def _init_noop_monitor(self):
+        self.sleeper = None
+        self.monitor_join = False
+
+    def start_monitoring(self):
+        if self._start:
+            self.monitor_thread.start()
+
+    def stop_monitoring(self):
+        self.monitor_running = False
+
+    def _monitor_sleep(self, sleep_amount):
+        self.sleeper.sleep(sleep_amount)
+
+    def shutdown_monitor(self):
+        self.stop_monitoring()
+        if self.sleeper is not None:
+            self.sleeper.wake()
+        if self.monitor_join:
+            log.debug("Joining monitor thread")
+            self.monitor_thread.join(self.monitor_join_sleep)