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diff --git a/src/python/grpcio/grpc/_cython/_cygrpc/fork_posix.pxd.pxi b/src/python/grpcio/grpc/_cython/_cygrpc/fork_posix.pxd.pxi
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index 0000000000..a925bdd2e6
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+++ b/src/python/grpcio/grpc/_cython/_cygrpc/fork_posix.pxd.pxi
@@ -0,0 +1,29 @@
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+cdef extern from "pthread.h" nogil:
+ int pthread_atfork(
+ void (*prepare)() nogil,
+ void (*parent)() nogil,
+ void (*child)() nogil)
+
+
+cdef void __prefork() nogil
+
+
+cdef void __postfork_parent() nogil
+
+
+cdef void __postfork_child() nogil \ No newline at end of file