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There is a bug in eventlet where logging within a native thread can lead
to a deadlock situation: https://github.com/eventlet/eventlet/issues/432
When encountered with this issue some projects in OpenStack using
oslo.log, eg. Cinder, resolve them by removing any logging withing
native threads.
There is actually a better approach. The Swift team came up with a
solution a long time ago [1], and in this patch that fix is included as
part of the setup method, but will only be run if the eventlet library
has already been loaded.
This patch adds the eventlet library as a testing dependency for the
PipeMutext unit tests.
[1]: https://opendev.org/openstack/swift/commit/69c715c505cf9e5df29dc1dff2fa1a4847471cb6
Closes-Bug: #1983863
Change-Id: Iac1b0891ae584ce4b95964e6cdc0ff2483a4e57d
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