From e573b3020c032400eed60b649a2cbf55266e6bb0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Thu, 30 Jun 2016 16:03:25 +0200
Subject: Add current configurations from old repository

---
 .../python/ycm/unsafe_thread_pool_executor.py      | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 vim/bundle/YouCompleteMe/python/ycm/unsafe_thread_pool_executor.py

(limited to 'vim/bundle/YouCompleteMe/python/ycm/unsafe_thread_pool_executor.py')

diff --git a/vim/bundle/YouCompleteMe/python/ycm/unsafe_thread_pool_executor.py b/vim/bundle/YouCompleteMe/python/ycm/unsafe_thread_pool_executor.py
new file mode 100644
index 0000000..666aebc
--- /dev/null
+++ b/vim/bundle/YouCompleteMe/python/ycm/unsafe_thread_pool_executor.py
@@ -0,0 +1,120 @@
+# Copyright 2009 Brian Quinlan. All Rights Reserved.
+#   Licensed to PSF under a Contributor Agreement.
+#
+# Copyright (C) 2013  Google Inc.
+#   Changes to this file are licensed under the same terms as the original file
+#   (the Python Software Foundation License).
+
+
+from __future__ import with_statement
+import threading
+import weakref
+import sys
+
+from concurrent.futures import _base
+
+try:
+    import queue
+except ImportError:
+    import Queue as queue
+
+
+# This file provides an UnsafeThreadPoolExecutor, which operates exactly like
+# the upstream Python version of ThreadPoolExecutor with one exception: it
+# doesn't wait for worker threads to finish before shutting down the Python
+# interpreter.
+#
+# This is dangerous for many workloads, but fine for some (like when threads
+# only send network requests). The YCM workload is one of those workloads where
+# it's safe (the aforementioned network requests case).
+
+class _WorkItem(object):
+    def __init__(self, future, fn, args, kwargs):
+        self.future = future
+        self.fn = fn
+        self.args = args
+        self.kwargs = kwargs
+
+    def run(self):
+        if not self.future.set_running_or_notify_cancel():
+            return
+
+        try:
+            result = self.fn(*self.args, **self.kwargs)
+        except BaseException:
+            e = sys.exc_info()[1]
+            self.future.set_exception(e)
+        else:
+            self.future.set_result(result)
+
+
+def _worker(executor_reference, work_queue):
+    try:
+        while True:
+            work_item = work_queue.get(block=True)
+            if work_item is not None:
+                work_item.run()
+                continue
+            executor = executor_reference()
+            # Exit if:
+            #   - The executor that owns the worker has been collected OR
+            #   - The executor that owns the worker has been shutdown.
+            if executor is None or executor._shutdown:
+                # Notice other workers
+                work_queue.put(None)
+                return
+            del executor
+    except BaseException:
+        _base.LOGGER.critical('Exception in worker', exc_info=True)
+
+
+class UnsafeThreadPoolExecutor(_base.Executor):
+    def __init__(self, max_workers):
+        """Initializes a new ThreadPoolExecutor instance.
+
+        Args:
+            max_workers: The maximum number of threads that can be used to
+                execute the given calls.
+        """
+        self._max_workers = max_workers
+        self._work_queue = queue.Queue()
+        self._threads = set()
+        self._shutdown = False
+        self._shutdown_lock = threading.Lock()
+
+    def submit(self, fn, *args, **kwargs):
+        with self._shutdown_lock:
+            if self._shutdown:
+                raise RuntimeError('cannot schedule new futures after shutdown')
+
+            f = _base.Future()
+            w = _WorkItem(f, fn, args, kwargs)
+
+            self._work_queue.put(w)
+            self._adjust_thread_count()
+            return f
+    submit.__doc__ = _base.Executor.submit.__doc__
+
+    def _adjust_thread_count(self):
+        # When the executor gets lost, the weakref callback will wake up
+        # the worker threads.
+        def weakref_cb(_, q=self._work_queue):
+            q.put(None)
+        # TODO(bquinlan): Should avoid creating new threads if there are more
+        # idle threads than items in the work queue.
+        if len(self._threads) < self._max_workers:
+            t = threading.Thread(target=_worker,
+                                 args=(weakref.ref(self, weakref_cb),
+                                       self._work_queue))
+            t.daemon = True
+            t.start()
+            self._threads.add(t)
+
+    def shutdown(self, wait=True):
+        with self._shutdown_lock:
+            self._shutdown = True
+            self._work_queue.put(None)
+        if wait:
+            for t in self._threads:
+                t.join()
+    shutdown.__doc__ = _base.Executor.shutdown.__doc__
-- 
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