fix race in test_lifecycle_service_client #1204
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Signed-off-by: Dirk Thomas <dirk-thomas@users.noreply.github.com>
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Fixes a race between one thread spinning and calling
rclcpp::shutdown()from another thread by making the critical sections mutually exclusive.The test has been failing since the first nightly build (https://ci.ros2.org/view/nightly/job/nightly_osx_repeated/1939/testReport/(root)/projectroot/test_lifecycle_service_client/) after being added in #1045.
Before:
After: