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def first_location_match(channel, locations):
    import os.path
    for x in locations:
        if os.path.exists(x):
            channel.send(x)
            break
    else:
        channel.send(None)
    
if __name__ == "__main__":

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diff --git a/structlog/threadlocal.py b/structlog/threadlocal.py
index 1b2eeb3..05f40ea 100644
--- a/structlog/threadlocal.py
+++ b/structlog/threadlocal.py
@@ -22,6 +22,34 @@ import uuid
 
 from structlog._config import BoundLoggerLazyProxy
 
+try:
+    from greenlet import getcurrent as _getident

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diff --git a/structlog/threadlocal.py b/structlog/threadlocal.py
index 1b2eeb3..80de726 100644
--- a/structlog/threadlocal.py
+++ b/structlog/threadlocal.py
@@ -17,11 +17,24 @@ Primitives to keep context global but thread local.
 """
 
 import contextlib
-import threading
 import uuid

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+    def test_is_greenlet_local(self, D):
+        greenlet = pytest.importorskip("greenlet")
+        d = wrap_dict(dict)()
+        d['x'] = 42
+
+        def run():
+            assert 'x' not in d._dict
+            d['x'] = 23
+

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import pytest
import time

delay = 0.006

@pytest.mark.parametrize("x", range(100))
def test_func(x):
    time.sleep(delay)

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import sys

import execnet

gw = execnet.makegateway("popen")

ch = gw.remote_exec("""
    while 1:
        data = channel.receive()
        if data:

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# content of testcases/conftest.py

from os.path import abspath, dirname
import os
import pytest
@pytest.fixture(autouse=True)
def cd_to_rootdir():
    os.chdir(dirname(dirname(abspath(__file__))))

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in case of a whole remote gateway gone:

>>> import execnet
>>> gw=execnet.makegateway()
>>> gw._rinfo()
<RInfo "platform=linux2, executable=/home/hpk/venv/0/bin/python, pid=22601, cwd=/home/hpk/p/devpi, version_info=(2, 7, 3, 'final', 0)">
>>> os.kill(22601, 9)
>>> gw.remote_exec("hello")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>

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import pytest
import contextlib

@contextlib.contextmanager
def ctx():
    print "setup ctx"
    yield 1
    print "teardown ctx"

@pytest.fixture

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def pytest_load_initial_conftests(parser, args):
    ns = parser.parse_known_args(args)
    if ns and ns.ds:   # orwhatever the option is called
        os.environ["DJANGO_SETTINGS"] = ...