prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Exception: raise OSError("handle is closed")
  When I initialized sentry_sdk and used concurrent.futures.process.ProcessPoolExecutor, the exception will be raised after python exit.
  
  ```
  from concurrent.futures.process import ProcessPoolExecutor
  
  import sentry_sdk
  
  sentry_sdk.init(dsn="")
  
  
  def test():
      ...
  
  
  if __name__ == "__main__":
      with ProcessPoolExecutor(max_workers=4) as worker:
          worker.submit(test)
  ```
  
  The exception:
  ```
  Error in atexit._run_exitfuncs:
  Traceback (most recent call last):
    File "/Users/tony.li/miniconda3/lib/python3.7/concurrent/futures/process.py", line 101, in _python_exit
      thread_wakeup.wakeup()
    File "/Users/tony.li/miniconda3/lib/python3.7/concurrent/futures/process.py", line 89, in wakeup
      self._writer.send_bytes(b"")
    File "/Users/tony.li/miniconda3/lib/python3.7/multiprocessing/connection.py", line 183, in send_bytes
      self._check_closed()
    File "/Users/tony.li/miniconda3/lib/python3.7/multiprocessing/connection.py", line 136, in _check_closed
      raise OSError("handle is closed")
  OSError: handle is closed
  ```
  
  </issue>
  <code>
  [start of sentry_sdk/integrations/threading.py]
  1 from __future__ import absolute_import
  2 
  3 import sys
  4 
  5 from threading import Thread
  6 
  7 from sentry_sdk import Hub
  8 from sentry_sdk._compat import reraise
  9 from sentry_sdk.utils import event_from_exception
  10 from sentry_sdk.integrations import Integration
  11 
  12 from sentry_sdk._types import MYPY
  13 
  14 if MYPY:
  15     from typing import Any
  16 
  17 
  18 class ThreadingIntegration(Integration):
  19     identifier = "threading"
  20 
  21     def __init__(self, propagate_hub=False):
  22         self.propagate_hub = propagate_hub
  23 
  24     @staticmethod
  25     def setup_once():
  26         # type: () -> None
  27         old_start = Thread.start
  28 
  29         def sentry_start(self, *a, **kw):
  30             hub = Hub.current
  31             integration = hub.get_integration(ThreadingIntegration)
  32             if integration is not None:
  33                 if not integration.propagate_hub:
  34                     hub_ = None
  35                 else:
  36                     hub_ = Hub(hub)
  37 
  38                 self.run = _wrap_run(hub_, self.run)
  39 
  40             return old_start(self, *a, **kw)  # type: ignore
  41 
  42         Thread.start = sentry_start  # type: ignore
  43 
  44 
  45 def _wrap_run(parent_hub, old_run):
  46     def run(*a, **kw):
  47         hub = parent_hub or Hub.current
  48 
  49         with hub:
  50             try:
  51                 return old_run(*a, **kw)
  52             except Exception:
  53                 reraise(*_capture_exception())
  54 
  55     return run
  56 
  57 
  58 def _capture_exception():
  59     hub = Hub.current
  60     exc_info = sys.exc_info()
  61 
  62     if hub.get_integration(ThreadingIntegration) is not None:
  63         # If an integration is there, a client has to be there.
  64         client = hub.client  # type: Any
  65 
  66         event, hint = event_from_exception(
  67             exc_info,
  68             client_options=client.options,
  69             mechanism={"type": "threading", "handled": False},
  70         )
  71         hub.capture_event(event, hint=hint)
  72 
  73     return exc_info
  74
  [end of sentry_sdk/integrations/threading.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/sentry_sdk/integrations/threading.py b/sentry_sdk/integrations/threading.py
  --- a/sentry_sdk/integrations/threading.py
  +++ b/sentry_sdk/integrations/threading.py
  @@ -1,15 +1,13 @@
   from __future__ import absolute_import
   
   import sys
  -
  -from threading import Thread
  +from threading import Thread, current_thread
   
   from sentry_sdk import Hub
   from sentry_sdk._compat import reraise
  -from sentry_sdk.utils import event_from_exception
  -from sentry_sdk.integrations import Integration
  -
   from sentry_sdk._types import MYPY
  +from sentry_sdk.integrations import Integration
  +from sentry_sdk.utils import event_from_exception
   
   if MYPY:
       from typing import Any
  @@ -34,21 +32,26 @@
                       hub_ = None
                   else:
                       hub_ = Hub(hub)
  -
  -                self.run = _wrap_run(hub_, self.run)
  +                # Patching instance methods in `start()` creates a reference cycle if
  +                # done in a naive way. See
  +                # https://github.com/getsentry/sentry-python/pull/434
  +                #
  +                # In threading module, using current_thread API will access current thread instance
  +                # without holding it to avoid a reference cycle in an easier way.
  +                self.run = _wrap_run(hub_, self.run.__func__)
   
               return old_start(self, *a, **kw)  # type: ignore
   
           Thread.start = sentry_start  # type: ignore
   
   
  -def _wrap_run(parent_hub, old_run):
  +def _wrap_run(parent_hub, old_run_func):
       def run(*a, **kw):
           hub = parent_hub or Hub.current
  -
           with hub:
               try:
  -                return old_run(*a, **kw)
  +                self = current_thread()
  +                return old_run_func(self, *a, **kw)
               except Exception:
                   reraise(*_capture_exception())
  
verification_info: {"golden_diff": "diff --git a/sentry_sdk/integrations/threading.py b/sentry_sdk/integrations/threading.py\n--- a/sentry_sdk/integrations/threading.py\n+++ b/sentry_sdk/integrations/threading.py\n@@ -1,15 +1,13 @@\n from __future__ import absolute_import\n \n import sys\n-\n-from threading import Thread\n+from threading import Thread, current_thread\n \n from sentry_sdk import Hub\n from sentry_sdk._compat import reraise\n-from sentry_sdk.utils import event_from_exception\n-from sentry_sdk.integrations import Integration\n-\n from sentry_sdk._types import MYPY\n+from sentry_sdk.integrations import Integration\n+from sentry_sdk.utils import event_from_exception\n \n if MYPY:\n     from typing import Any\n@@ -34,21 +32,26 @@\n                     hub_ = None\n                 else:\n                     hub_ = Hub(hub)\n-\n-                self.run = _wrap_run(hub_, self.run)\n+                # Patching instance methods in `start()` creates a reference cycle if\n+                # done in a naive way. See\n+                # https://github.com/getsentry/sentry-python/pull/434\n+                #\n+                # In threading module, using current_thread API will access current thread instance\n+                # without holding it to avoid a reference cycle in an easier way.\n+                self.run = _wrap_run(hub_, self.run.__func__)\n \n             return old_start(self, *a, **kw)  # type: ignore\n \n         Thread.start = sentry_start  # type: ignore\n \n \n-def _wrap_run(parent_hub, old_run):\n+def _wrap_run(parent_hub, old_run_func):\n     def run(*a, **kw):\n         hub = parent_hub or Hub.current\n-\n         with hub:\n             try:\n-                return old_run(*a, **kw)\n+                self = current_thread()\n+                return old_run_func(self, *a, **kw)\n             except Exception:\n                 reraise(*_capture_exception())\n", "issue": "Exception: raise OSError(\"handle is closed\")\nWhen I initialized sentry_sdk and used concurrent.futures.process.ProcessPoolExecutor, the exception will be raised after python exit.\r\n\r\n```\r\nfrom concurrent.futures.process import ProcessPoolExecutor\r\n\r\nimport sentry_sdk\r\n\r\nsentry_sdk.init(dsn=\"\")\r\n\r\n\r\ndef test():\r\n    ...\r\n\r\n\r\nif __name__ == \"__main__\":\r\n    with ProcessPoolExecutor(max_workers=4) as worker:\r\n        worker.submit(test)\r\n```\r\n\r\nThe exception:\r\n```\r\nError in atexit._run_exitfuncs:\r\nTraceback (most recent call last):\r\n  File \"/Users/tony.li/miniconda3/lib/python3.7/concurrent/futures/process.py\", line 101, in _python_exit\r\n    thread_wakeup.wakeup()\r\n  File \"/Users/tony.li/miniconda3/lib/python3.7/concurrent/futures/process.py\", line 89, in wakeup\r\n    self._writer.send_bytes(b\"\")\r\n  File \"/Users/tony.li/miniconda3/lib/python3.7/multiprocessing/connection.py\", line 183, in send_bytes\r\n    self._check_closed()\r\n  File \"/Users/tony.li/miniconda3/lib/python3.7/multiprocessing/connection.py\", line 136, in _check_closed\r\n    raise OSError(\"handle is closed\")\r\nOSError: handle is closed\r\n```\n", "before_files": [{"content": "from __future__ import absolute_import\n\nimport sys\n\nfrom threading import Thread\n\nfrom sentry_sdk import Hub\nfrom sentry_sdk._compat import reraise\nfrom sentry_sdk.utils import event_from_exception\nfrom sentry_sdk.integrations import Integration\n\nfrom sentry_sdk._types import MYPY\n\nif MYPY:\n    from typing import Any\n\n\nclass ThreadingIntegration(Integration):\n    identifier = \"threading\"\n\n    def __init__(self, propagate_hub=False):\n        self.propagate_hub = propagate_hub\n\n    @staticmethod\n    def setup_once():\n        # type: () -> None\n        old_start = Thread.start\n\n        def sentry_start(self, *a, **kw):\n            hub = Hub.current\n            integration = hub.get_integration(ThreadingIntegration)\n            if integration is not None:\n                if not integration.propagate_hub:\n                    hub_ = None\n                else:\n                    hub_ = Hub(hub)\n\n                self.run = _wrap_run(hub_, self.run)\n\n            return old_start(self, *a, **kw)  # type: ignore\n\n        Thread.start = sentry_start  # type: ignore\n\n\ndef _wrap_run(parent_hub, old_run):\n    def run(*a, **kw):\n        hub = parent_hub or Hub.current\n\n        with hub:\n            try:\n                return old_run(*a, **kw)\n            except Exception:\n                reraise(*_capture_exception())\n\n    return run\n\n\ndef _capture_exception():\n    hub = Hub.current\n    exc_info = sys.exc_info()\n\n    if hub.get_integration(ThreadingIntegration) is not None:\n        # If an integration is there, a client has to be there.\n        client = hub.client  # type: Any\n\n        event, hint = event_from_exception(\n            exc_info,\n            client_options=client.options,\n            mechanism={\"type\": \"threading\", \"handled\": False},\n        )\n        hub.capture_event(event, hint=hint)\n\n    return exc_info\n", "path": "sentry_sdk/integrations/threading.py"}]}